JP7521235B2 - Packaging bag, manufacturing method thereof, and packaging material - Google Patents

Description

The present invention relates to a packaging bag, a method for manufacturing the packaging bag, and a packaging material used for the packaging bag.

In packaging bags such as pouches that seal liquid contents such as food, detergent, etc., a score line may be provided so that the bag can be easily torn and opened by hand without using tools such as scissors. The score line can be formed by various methods, but is often formed by laser processing from the viewpoint of forming the score line easily and accurately (e.g., Patent Documents 1 and 2).
When forming a cut line by laser processing, a laser is applied to the outer layer side of the packaging material before the bag is made. During this laser irradiation, the film on the outer layer side absorbs the laser light and is cut, while the film on the inner layer side that has heat sealability is not cut because it transmits the laser light. Therefore, even if a packaging bag is formed using the packaging material after laser irradiation, the sealability of the contents is ensured.

It is known that the above-mentioned packaging bags are laminated with aluminum foil or a resin film having a metal vapor deposition film in order to impart gas barrier properties, light blocking properties, and a design with a metallic luster.

Japanese Patent Application Publication No. 11-278556 JP 2000-85791 A

When forming a cut line using a laser, the laser light is focused to reliably form a cut line in the outer film and adjust the cut line width. However, in packaging materials with aluminum foil or metal deposition film laminated thereon, the laser light is reflected by the aluminum foil or metal deposition film. In particular, when aluminum foil or metal deposition film is placed near the outer film to achieve a design with a metallic luster, the focus of the laser light is close to the aluminum foil, etc., and reflection is significant. The focused laser light is reflected by the aluminum foil or metal deposition film and re-enters the outer film, causing the outer film to absorb the laser light and be cut. As a result, poor processing accuracy has been an issue, with the cut line width being larger than the design value and the edges of the cut line becoming messy.

In addition, when bags are made using packaging materials on which laser-processed lines such as cut lines have been formed by laser irradiation, there is a risk that the laser-processed lines will easily become misaligned, resulting in problems such as poor opening of the bags.

The present invention aims to provide a packaging bag that has an excellent metallic luster and is easy to process with laser light, a method for producing the packaging bag, and a packaging material that can be used for the packaging bag.

As a result of the inventors' investigations, they discovered that by making the packaging bag into the configuration described below, it is possible to impart an excellent metallic luster to the packaging bag, and further improve processability such as laser processing accuracy and alignment accuracy.

In order to solve the above problems, the present invention provides the following [1] to [10].
[1] A packaging bag including a laminate A comprising a laser-cuttable film (A) and a laser-non-cuttable film (A), wherein the laminate A comprises a glittering printed layer between the laser-cuttable film (A) and the laser-non-cuttable film (A), or on the opposite side of the laser-cuttable film (A) to the laser-non-cuttable film (A), and the packaging bag has an adhesive region in which the laser-non-cuttable films (A) are partially bonded together as inner layers, and a non-adhesive region for containing an item to be contained, and the total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less, and the non-adhesive region has an area in which the laser-cuttable film (A) is cut and the laser-non-cuttable film (A) is not cut, in part of the non-adhesive region.

[2] A packaging bag including a laminate A including a laser-cuttable film (A) and a laser-non-cuttable film (A), and a laminate B including a laser-cuttable film (B) and a laser-non-cuttable film (B), wherein the laminate A includes a glittering printed layer between the laser-cuttable film (A) and the laser-non-cuttable film (A), or on the opposite side of the laser-cuttable film (A) to the laser-non-cuttable film (A), and the packaging bag includes a laminate A including a laser-cuttable film (A) and a laser-non-cuttable film (A) and a laser-non-cuttable film (B). a packaging bag having an adhesive region where the laser-cuttable film (A) and the laser-cuttable film (B) are partially adhered to each other, and a non-adhesive region for accommodating an item to be contained, the total thickness of the packaging bag in the non-adhesive region being 60 μm or more and 300 μm or less, and a portion of the non-adhesive region having an area where the laser-cuttable film (A) and the laser-cuttable film (B) are cut, and an area where the laser-cuttable film (A) and the laser-cuttable film (B) are not cut.
[3] The packaging bag according to [2], which has a printed layer between the laser-cuttable film (B) and the laser-non-cuttable film (B), or on the opposite side of the laser-cuttable film (B) to the laser-non-cuttable film (B).

[4] The packaging bag according to any one of [1] to [3], wherein the laminate A does not contain a metal vapor deposition film or a metal foil.
[5] The packaging bag according to [2] or [3], wherein the laminate B does not contain a metal vapor deposition film or a metal foil.
[6] The packaging bag according to any one of [1] to [5], wherein the glittering printed layer contains metal flakes.

[7] A method for producing a packaging bag according to [1], comprising the steps of partially bonding the laser-non-cuttable films (A) together as inner layers to form a bonded region of the laminate A where the laser-non-cuttable films (A) are bonded and a non-bonded region for containing an object to be contained, and irradiating laser light from one side of the laser-cuttable film (A) using a carbon dioxide laser to cut the laser-cuttable film (A) in the thickness direction of a portion of the surface of the packaging bag in the laminate A on the side irradiated with the laser light, forming a region in which the laser-cuttable film (A) is not cut, and cutting the laser-cuttable film (A) in the thickness direction of a portion of the surface of the packaging bag in the laminate A on the side opposite to the side irradiated with the laser light, forming a region in which the laser-cuttable film (A) is not cut.

[8] A method for producing a packaging bag according to [2] or [3], comprising the steps of: arranging the laser-uncuttable film (A) of the laminate A and the laser-uncuttable film (B) of the laminate B so that they face each other and are the inner layer sides; partially bonding the laser-uncuttable film (A) and the laser-uncuttable film (B) to form a bonded area where the laser-uncuttable film (A) and the laser-uncuttable film (B) are bonded, and a non-bonded area for containing an object; and irradiating a laser beam from the side of the laser-cuttable film (A) or the side of the laser-cuttable film (B) using a carbon dioxide laser to cut the laser-cuttable film (A) in the thickness direction of a portion of the surface of the packaging bag to form an area where the laser-cuttable film (A) is not cut, and cutting the laser-cuttable film (B) in the thickness direction of a portion of the surface of the packaging bag to form an area where the laser-cuttable film (B) is not cut.

[9] A packaging material for use in the packaging bag described in any one of [1] to [6], comprising a laser-cuttable film (A), a glossy printed layer, and a laser-non-cuttable film (A), wherein the glossy printed layer is located between the laser-cuttable film (A) and the laser-non-cuttable film (A), or on the opposite side of the laser-cuttable film (A) to the laser-non-cuttable film (A).
[10] The packaging material according to [9], wherein the laser-non-cuttable film (A) has heat sealability.

The present invention makes it possible to obtain a packaging bag that has an excellent metallic luster and is excellent in processability with laser light, a method for producing the packaging bag, and a packaging material that can be used for the packaging bag.

1 is a plan view of a packaging bag (pillow bag) according to a first embodiment of the present invention, as viewed from the back. FIG. FIG. 2 is a schematic cross-sectional view of an example of laminate A. FIG. 2 is a schematic cross-sectional view of an example of laminate A. FIG. 2 is a schematic cross-sectional view of an example of laminate A. FIG. 2 is a schematic cross-sectional view of an example of laminate A. 1 is a schematic cross-sectional view of a packaging bag according to a first embodiment, the packaging bag being cut including a laser processing area. FIG. FIG. 2 is a plan view of a packaging bag (pouch) according to a second embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of an example of laminate B. FIG. 2 is a schematic cross-sectional view of an example of laminate B. FIG. 2 is a schematic cross-sectional view of an example of laminate B. 10 is a schematic cross-sectional view of a packaging bag according to a second embodiment, showing a state where the packaging bag is cut including a laser processing area. FIG.

[Packaging bag]
A first aspect of the present invention is a packaging bag including a laminate A comprising a laser-cuttable film (A) and a laser-non-cuttable film (A), wherein the laminate A comprises a glittering printed layer between the laser-cuttable film (A) and the laser-non-cuttable film (A), or on the opposite side of the laser-cuttable film (A) to the laser-non-cuttable film (A), and the packaging bag has an adhesive region in which the laser-non-cuttable films (A) are partially adhered to each other as inner layers, and a non-adhesive region for accommodating an item to be contained, and the total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less, and the packaging bag has an area in which the laser-cuttable film (A) is cut and the laser-non-cuttable film (A) is not cut, in part of the non-adhesive region.

A second aspect of the present invention is a packaging bag including a laminate A comprising a laser-cuttable film (A) and a laser-non-cuttable film (A), and a laminate B comprising a laser-cuttable film (B) and a laser-non-cuttable film (B), wherein the laminate A has a glittering printed layer between the laser-cuttable film (A) and the laser-non-cuttable film (A) or on the side of the laser-cuttable film (A) opposite to the laser-non-cuttable film (A), and the packaging bag includes a laminate A comprising a laser-cuttable film (A) and a laser-non-cuttable film (A) and a laser-non-cuttable film (B). The packaging bag is arranged so that the laser-cuttable film (A) and the laser-cuttable film (B) are on the inner layer side, and has an adhesive region where the laser-cuttable film (A) and the laser-cuttable film (B) are partially adhered to each other, and a non-adhesive region for accommodating the contents, and the total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less, and the laser-cuttable film (A) and the laser-cuttable film (B) are cut in part of the non-adhesive region, and has an area where the laser-cuttable film (A) and the laser-cuttable film (B) are not cut.

The use of the packaging bag of the present invention is not particularly limited, but it can be used suitably as a bag for storing food, medicine, cosmetics, etc. The contents are not particularly limited, and the packaging bag can be used to store contents of various shapes such as liquids, powders, granules, and solids.

The shape of the packaging bag of the present invention is not particularly limited, and examples of the shape of the packaging bag include a pillow bag, a three-side sealed bag, a four-side sealed bag, a pouch, and a gusset bag.
The packaging bag of the present invention is particularly suitable for use in light packaging having a relatively thin overall thickness, such as coffee sticks, medicines or health foods individually packaged in stick form, etc.

[Packaging bag according to the first aspect]
The configuration of the packaging bag according to the first aspect will be described below using a pillow bag as an example.
1 is a plan view of a pillow bag as seen from the back. A pillow bag (packaging bag) 10 is made by sealing a single rectangular sheet-shaped packaging material.

<Laminate A (packaging material)>
The packaging material is composed of a laminate A. The laminate A includes at least a laser-cuttable film (A), a laser-non-cuttable film (A), and a glittering printed layer.
FIG. 2 is a schematic cross-sectional view of an example of the laminate A. In the laminate A (reference numeral 30) of FIG. 2, a laser non-cuttable film (A) 32, a glittering printed layer 34, and a laser-cuttable film (A) 36 are laminated in this order. As a modification of FIG. 2, as in the laminate A (reference numeral 40) shown in FIG. 3, a laser-cuttable film (A') 38 may be further provided between the glittering printed layer 34 and the laser non-cuttable film (A) 32. Alternatively, as in the laminate A (reference numeral 50) shown in FIG. 4, a laser-cuttable film (A') 38 may be further provided between the glittering printed layer 34 and the laser-cuttable film (A) 36.

Figure 5 is a schematic cross-sectional view of another example of laminate A. Laminate A (reference numeral 60) in Figure 5 is formed by laminating a laser-non-cuttable film (A) 32, a laser-cuttable film (A) 36, and a glossy printed layer 34 in this order.

In order to make the glossy printed layer 34 visible, at least a portion of the surface of the layer formed on the outer side of the glossy printed layer 34 is optically transparent. Furthermore, each layer constituting the laminate A can transmit light in the wavelength range of the carbon dioxide laser light.
The laminate A may have a gas barrier layer between the glossy printed layer and the laser non-cuttable film (A) or between the glossy printed layer and the laser-cuttable film (A). However, it is preferable that the laminate A does not include a metal vapor deposition film or a metal foil.

The packaging bag (pillow bag 10) of the first embodiment is formed with the laser-non-cuttable film (A) as the inner layer, and is produced by partially sealing (bonding) the laser-non-cuttable films (A) together. The sealed portion (bonded area) of the pillow bag 10 includes a lower sealed portion 12, an upper sealed portion 14, and a back sealed portion 16. The area surrounded by the lower sealed portion 12, the upper sealed portion 14, the back sealed portion 16, and the side edges 18a, 18b is the non-bonded area 20, which becomes a storage space for storing the contents. When the lower sealed portion 12 and the back sealed portion 16 are formed, the side 14a of the upper sealed portion 14 becomes an opening for storing the contents.

The total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less. In the non-adhesive region of the pillow bag 10 in FIG. 1, two layers of the laminate A are stacked. In the first embodiment, the "total thickness of the packaging bag in the non-adhesive region" corresponds to the sum of the thicknesses of the two layers of the laminate A. In other words, the "total thickness of the packaging bag in the non-adhesive region" corresponds to twice the thickness of the laminate A. The "thickness of the laminate A" corresponds to the total thickness of each layer (described in detail later) that constitutes the laminate A. The total thickness is preferably 70 μm or more, and more preferably 80 μm or more. The total thickness is preferably 250 μm or less, and more preferably 200 μm or less.

In the first embodiment, a part of the non-adhesive region has a laser processed region 22. The laser processed region 22 is a cut line. In the pillow bag 10 of Fig. 1, the laser processed region 22 is provided in the vicinity of the top seal portion 14 and approximately parallel to the side 14a of the top seal portion 14.
When the laser processing area 22 is a cut line, it is particularly preferable that the laser processing area 22 is linear as shown in Fig. 1 in order to easily guide the cutting in a specific direction. However, the present invention is not limited to this, and the laser processing area 22 may be, for example, curved or wavy. Furthermore, the laser processing area 22 may be a continuous line or a discontinuous line such as a dotted line.

The width and length of the laser processing area 22 can be set appropriately depending on the application of the packaging bag, the position where the laser processing area is formed, the ease of opening, etc. Considering the beam diameter of the laser light, the ease of opening, the design, etc., it is preferable that the width of the laser processing area 22 is 0.1 mm to 2 mm.

The laser processing area 22 is not limited to the position shown in FIG. 1, so long as it is provided in a part of the non-adhesive area. For example, the laser processing area 22 may be formed so as to extend obliquely with respect to the side edge 18a of the pillow bag 10 and the side 14a of the upper seal portion 14 at a corner of the pillow bag 10 in FIG. 1. In this way, the laser processing area 22 may be provided not only in the non-adhesive area, but also in the adhesive area. The thickness of the adhesive area is approximately the same as the sum of the thicknesses of the two laminated layers A, and is approximately the same as the total thickness of the packaging bag in the non-adhesive area.

In the packaging bag of the first embodiment, a schematic cross-sectional view of the packaging bag cut including the laser processed area in a direction substantially perpendicular to the direction in which the laser processed area extends (i.e., the width direction) is shown in Fig. 6. Fig. 6 shows an example in which the laminate A having the configuration shown in Fig. 2 is used, and the area between the laser-uncuttable films (A) 32 is a non-adhesive area.
6, in the laser processing area 22, the laser-cuttable film (A) 36 and the glossy printed layer 34 are cut, and the laser-non-cuttable film (A) 32 is not cut. In the laser processing area 22, the cut positions of the laser-cuttable film (A) 36 are approximately the same between the laminate A (30-1) located on the front side of the pillow bag 10 and the laminate A (30-2) located on the back side.

<Manufacturing method of packaging bag according to the first aspect>
The method for producing the packaging bag according to the first embodiment will be described below using the pillow bag shown in FIG. 1 as an example.
(1) A sheet cut from the laminate A (packaging material) is formed into a bag shape with the laser-uncuttable film (A) on the inner layer side. Then, the bottom seal portion 12 and the back seal portion 16 (adhesive area) are formed by heat sealing, and a non-adhesive area 20 (accommodation space) for accommodating the contents is formed. The area corresponding to the top seal portion 14 is used as an opening when the packaged item (contents) is stored in the non-adhesive area 20 (accommodation space).

(2) A predetermined location of the molded article obtained in (1) is irradiated with laser light from one side (front side or back side) of the laminate A using a carbon dioxide laser (wavelength: 10.6 μm to 10.9 μm). Considering the thickness of the back seal portion 16, it is preferable to irradiate with laser light from the front side. The irradiation conditions of the carbon dioxide laser are preferably in the range of output: 20 to 40 W, sweep speed: 1000 to 3000 mm/sec, and focal length: 5 to 20 mm.
A part of the laser light is absorbed by the laser-cuttable film (A) on the incident side, and the laser-cuttable film (A) evaporates at the irradiated area, and the laser-cuttable film (A) is cut in the thickness direction. Also, a part of the laser light is absorbed by the glittering printed layer on the incident side, and the glittering printed layer evaporates and disappears in the irradiated area. On the other hand, in the laser-non-cuttable film (A), the absorption of the laser light does not occur or the amount of absorption is small. Therefore, a part of the laser light passes through the laminate A on the irradiated side and reaches the laminate A on the opposite side. Similarly, in the laminate A on the opposite side, the laser-non-cuttable film (A) does not absorb the laser light or the amount of absorption is small, so most of the laser light passes through the glittering printed layer and the laser-non-cuttable film (A) and reaches the glittering printed layer. The laser light is absorbed by the glittering printed layer, and the glittering printed layer evaporates and disappears. The laser light reaching the laser-cuttable film (A) is absorbed by the laser-cuttable film (A), causing the laser-cuttable film (A) to evaporate and cut in the thickness direction, thereby forming laser-processed areas on the front and back surfaces of the molded article, where the laser-cuttable film (A) is cut and the laser-non-cuttable film (A) is not cut.

(3) The packaged item (contents) is placed in the molded product (2). The top seal is then formed by heat sealing.

＜Effects＞
The packaging bag of the first aspect has a glossy printed layer, and therefore has an excellent metallic luster.
When removing the contents from the packaging bag (pillow bag), the laminate A is torn in the laser processing area to open it. Since the laser processing area is thinner than the surrounding areas, the strength of the packaging bag is weakened in the laser processing area. Therefore, when opening the bag, the laminate A is cut in the laser processing area. Since the cutting positions of the laser-cuttable film on the front and back sides are approximately the same, the packaging bag is easily cut in the laser processing area, and the packaging bag can be opened with less force. Furthermore, the cutting direction is easily guided in the extension direction of the laser processing area.

In the first embodiment, the total thickness of the packaging bag is relatively thin, between 60 μm and 300 μm, so that even if laser light is irradiated from the laminate A on one side, part of the laser light passes through the laminate A and can reach the laminate A on the opposite side. As a result, by irradiating laser light from one side, laser processing areas can be formed on the laminate A on both sides. Conventionally, bags were made by forming a cut line in the packaging material and then aligning the cut line, but the manufacturing method of the present invention does not require the alignment step. Furthermore, by not including a metal vapor deposition film or metal foil, it is possible to improve the processing accuracy of the cut line. Therefore, according to the first embodiment, a packaging bag with excellent processability by laser light and a packaging material suitable for the packaging bag can be obtained.

[Packaging bag according to the second embodiment]
Next, the configuration of the packaging bag according to the second embodiment will be described below using a pouch as an example.
Fig. 7 is a plan view of a pouch, which is an example of the packaging bag according to the second embodiment. The pouch 100 in Fig. 7 is a standing type pouch formed by heat sealing a body portion 102 and a bottom portion 104.

7, the body 102 includes a pair of main sheets 106, which are made up of a front main sheet 106a and a back main sheet 106b arranged opposite each other. The sides 108a, 108b of the pair of overlapping main sheets 106 are heat-sealed to each other to form adhesive regions 116.
A bottom sheet 114 forming the bottom 104 is disposed between the lower edges 110 of the pair of main sheets 106. The bottom sheet 114 is bent convexly toward the upper edge 112, and the vicinity of its periphery is heat-sealed together with the lower portions of the overlapping front main sheet 106a and back main sheet 106b, thereby forming an adhesive region 116.
7, an opening is formed between the upper edge 112 of the front main sheet 106a and the back main sheet 106b, and the contents can be placed through the opening. After the contents are placed in the pouch, the vicinity of the upper edge 112 is heat-sealed to form an adhesive region 116, thereby sealing the pouch.
The area surrounded by the bonded areas of the pair of main sheet 106 and bottom sheet 114 is a non-bonded area 120, which becomes a storage space for storing contents.

<Laminate A (packaging material)>
In the second embodiment, the front main surface sheet 106a or the back main surface sheet 106b is formed of a laminate A. The laminate A includes at least a laser-cuttable film (A), a laser-non-cuttable film (A), and a glossy printed layer. In this embodiment, any of the laminates A exemplified in Figs. 2 to 5 can be used. In the second embodiment, the laminate A may also have a gas barrier layer. However, it is preferable that the laminate A does not include a metal vapor deposition film or a metal foil.

<Laminate B>
The front principal surface sheet 106a or the back principal surface sheet 106b, which is not formed of the laminate A, is formed of the laminate B. The laminate B includes at least a laser-cuttable film (B) and a laser-non-cuttable film (B).

Figure 8 is a schematic cross-sectional view of an example of laminate B used in the packaging bag of the second embodiment. Laminate B (reference numeral 130) in Figure 8 is formed by laminating a laser non-cuttable film (B) 132 and a laser cuttable film (B) 136.

Figure 9 is a schematic cross-sectional view of another example of laminate B. In laminate B (reference numeral 140) in Figure 9, a laser non-cuttable film (B) 132, a printed layer 134, and a laser-cuttable film (B) 136 are laminated in this order. As a modification of Figure 9, a laser-cuttable film (B') may be further provided between the printed layer 134 and the laser non-cuttable film (B) 132. Alternatively, a laser-cuttable film (B') may be further provided between the printed layer 134 and the laser-cuttable film (B).

Figure 10 is a schematic cross-sectional view of yet another example of laminate B. Laminate B (reference numeral 150) in Figure 10 is formed by laminating a laser non-cuttable film (B) 132, a laser cuttable film (B) 136, and a printed layer 134 in this order.

In addition, the printed layer 134 in the laminate B may be a glittering printed layer, or a picture printed layer (described later) that does not contain glittering pigments.

In the second embodiment, the laminate B may have a gas barrier layer between the photoluminescent printed layer and the laser non-cuttable film (B) or between the photoluminescent printed layer and the laser cuttable film (B). However, it is preferable that the laminate B does not include a metal vapor deposition film or a metal foil.

The bottom sheet does not have to be obtained from laminate A or laminate B, and is not particularly limited as long as it is a sheet-like packaging material in which a layer having heat sealability is formed on the inner layer side.

The packaging bag (pouch 100) of the second embodiment is produced by arranging the laser-non-cuttable film (A) of the laminate A and the laser-non-cuttable film (B) of the laminate B on the inner layer side, and partially sealing (bonding) the laser-non-cuttable film (A) and the laser-non-cuttable film (B) as described above.

In the second embodiment, the total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less. In the non-adhesive region of the pouch 100 in FIG. 7, the laminate A and the laminate B overlap. In the second embodiment, the "total thickness of the packaging bag in the non-adhesive region" corresponds to the sum of the thicknesses of the laminate A and the laminate B. The "thickness of the laminate A" corresponds to the sum of the thicknesses of the layers constituting the laminate A. The "thickness of the laminate B" corresponds to the sum of the thicknesses of the layers constituting the laminate B. The total thickness is preferably 70 μm or more, and more preferably 80 μm or more. The total thickness is preferably 250 μm or less, and more preferably 200 μm or less.

In the second embodiment, a laser processed area 122 is provided in a portion of the non-adhesive area. The laser processed area 122 is, for example, a score line. In the pouch 100 of FIG. 7, the laser processed area 122 is provided in the vicinity of the adhesive area 116 on the upper edge 112 side, approximately parallel to the upper edge 112 of the main face sheet 106. As in the first embodiment, the laser processed area 122 may be linear, curved, wavy, or the like. The laser processed area 122 may also be a continuous line, or a discontinuous line such as a dotted line.

The laser processing area 122 may be provided not only in the non-adhesive area but also in the adhesive area. The thickness of the adhesive area is approximately the same as the sum of the thickness of the laminate A and the thickness of the laminate B, and is approximately the same as the total thickness of the packaging bag in the non-adhesive area.
In the pouch 100 of FIG. 7, a notch 124 may be provided in at least one of the side edges 108 a , 108 b of the main sheet 106 , and the laser processed area 122 may start from the notch 124 .

In the second embodiment, the width and length of the laser processing area 122 can be set appropriately depending on the application of the packaging bag, the position where the laser processing area is formed, the openability, etc. Considering the beam diameter of the laser light, the openability, the design, etc., the width of the laser processing area 122 is preferably 0.1 mm to 2 mm.

In the packaging bag of the second embodiment, a schematic cross-sectional view of the packaging bag cut including the laser processed area in a direction substantially perpendicular to the direction in which the laser processed area extends (i.e., the width direction) is shown in Fig. 11. Fig. 11 shows an example in which the laminate A having the configuration shown in Fig. 2 and the laminate B having the configuration shown in Fig. 9 are used.
As shown in Fig. 11, in the laser processing area 122, the laser-cuttable film (A) 36 and the laser-cuttable film (B) 136 are cut. In addition, the glittering printed layer 34 of the laminate A and the printed layer 134 of the laminate B are also cut. On the other hand, the laser-uncuttable film (A) 32 and the laser-uncuttable film (B) 132 are not cut. In the laser processing area 122, the cutting positions of the laser-cuttable film (A) 36 of the laminate A (reference number 30) and the laser-cuttable film (B) 136 of the laminate B (reference number 140) are approximately the same.

<Manufacturing method of packaging bag according to the second aspect>
The method for producing a packaging bag according to the second embodiment will be described below by taking the pouch shown in FIG. 7 as an example.
(1) A front principal surface sheet and a back principal surface sheet are cut out from laminate A (packaging material) and laminate B. When the front principal surface sheet is laminate A, the back principal surface sheet is laminate B. Alternatively, when the front principal surface sheet is laminate B, the back principal surface sheet is laminate A. Also, a bottom sheet is cut out from a packaging sheet having a heat seal layer. The bottom sheet does not have to be laminate A or laminate B.
The front main sheet 106a, the back main sheet 106b, and the bottom sheet 114 are aligned so that the heat-sealable layers are on the inner side. Then, the areas other than the upper edge 112 of the pouch are heat-sealed to form an adhesive region 116. At the same time, a non-adhesive region 120 (storage space) that is surrounded by the adhesive region 116 and that contains the contents is formed.

(2) The molded article obtained in (1) is irradiated with laser light using a carbon dioxide laser (wavelength: 10.6 μm to 10.9 μm) at a predetermined location on the front main surface sheet 106a or the back main surface sheet 106b. The laser light is irradiated from the laminate A side or the laminate B side. The irradiation conditions for the carbon dioxide laser are in the range of output: 20 to 40 W, sweep speed: 1000 to 3000 mm/sec, and focal length: 5 to 20 mm.
Although the following will describe the case where the laser light is irradiated from the laminate A side, the same applies to the case where the laser light is irradiated from the laminate B side.
A part of the laser light is absorbed by the laser-cuttable film (A) on the incident side, and the laser-cuttable film (A) evaporates at the irradiated location, and the laser-cuttable film (A) is cut in the thickness direction. Also, a part of the laser light is absorbed by the glittering printed layer on the incident side, and the glittering printed layer evaporates and disappears in the irradiated area. On the other hand, in the laser-non-cuttable film (A), the absorption of the laser light does not occur or the amount of absorption is small. Therefore, a part of the laser light passes through the laminate A on the irradiated side and reaches the laminate B on the opposite side. Similarly, in the laminate B on the opposite side, the laser-non-cuttable film (B) does not absorb the laser light or the amount of absorption is small, so most of the laser light passes through the laser-non-cuttable film (B) and reaches the laser-cuttable film (B). When a printed layer (including a glittering printed layer) is formed on the laminate B, the laser light is absorbed by the printed layer, and the printed layer evaporates and disappears in the irradiated area. A part of the laser light reaches the laser-cuttable film (B) and is absorbed by the laser-cuttable film (B), causing the laser-cuttable film (B) to evaporate and cut in the thickness direction. As a result, the laser-cuttable film (A) and the laser-cuttable film (B) are cut on the front main surface sheet and the back main surface sheet of the molded product, forming a laser processed area 122 in which the laser-cuttable film (A) and the laser-cuttable film (B) are not cut.

(3) The packaged item (contents) is placed in the molded product (2). The upper edge 112 of the pouch is then heat sealed to form an adhesive area 116.

＜Effects＞
The packaging bag of the second embodiment has a glossy printed layer, and therefore has an excellent metallic luster.
When removing the contents from the packaging bag (pouch), the main sheet is torn in the laser processing area to open it. In the second embodiment, the laminate A and the laminate B are also cut in the laser processing area when opening. Since the cutting positions of the laser-cuttable film (A) and the laser-cuttable film (B) are approximately the same, the main sheet (laminate A and laminate B) is easily cut in the laser processing area, so that the pouch can be opened with less force. Furthermore, the cutting direction is easily guided in the extension direction of the laser processing area.

In the second embodiment, the total thickness of the packaging bag is relatively thin, at 60 μm or more and 300 μm or less, so that even if laser light is irradiated from the main sheet on one side (laminate A or laminate B), part of the laser light passes through the main sheet and can reach the main sheet on the opposite side (laminate B or laminate A). In other words, by irradiating laser light from one side, laser processing areas can be formed simultaneously on the front main sheet and the back main sheet. Therefore, the manufacturing method of the present invention does not require an alignment step. Furthermore, by not including a metal vapor deposition film or metal foil, it is possible to improve the processing accuracy of the cut line. According to the second embodiment, a packaging bag with excellent processability by laser light and a packaging material suitable for the packaging bag can be obtained.

Each layer of the laminate A and the laminate B will be described in detail below.
<Laser-cuttable film (A), Laser-cuttable film (B)>
The laser-cuttable film (A) and the laser-cuttable film (B) serve as a substrate. When the laser-cuttable film (A) is located outside the glossy printed layer, the laser-cuttable film (A) is made of a material having light transparency so that the glossy printed layer can be seen from the outside. When the laser-cuttable film (B) is located outside the printed layer (including the glossy printed layer), the laser-cuttable film (B) is made of a material having light transparency so that the printed layer can be seen from the outside.

As described above, the laser-cuttable film (A) and the laser-cuttable film (B) have the property of absorbing the laser light from the carbon dioxide laser and evaporating. This causes the laser-cuttable film (A) and the laser-cuttable film (B) to cut in the laser light irradiated area.

Specifically, examples of the laser-cuttable film (A) and the laser-cuttable film (B) used in the present invention include polyamide resins such as various nylons (Ny), polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), etc. Among these, nylon, polyethylene terephthalate, and polybutylene terephthalate, which have high absorption rates of laser light from a carbon dioxide laser, are most preferably used.
The laser-cuttable film (A) and the laser-cuttable film (B) may be uniaxially or biaxially stretched. The laser-cuttable film (A) and the laser-cuttable film (B) may be a composite film in which two or more of the above resin films are laminated. The composite film may be formed by an inflation method or a melt extrusion coating method.

The thickness of the laser-cuttable film (A) and the laser-cuttable film (B) is not particularly limited, and can be set appropriately depending on the application of the packaging bag so long as it does not exceed the total thickness of the packaging bag described above. Specifically, the thickness is usually preferably about 5 μm to 50 μm, more preferably 7 μm to 40 μm, and even more preferably 9 μm to 30 μm.

<Laser-cuttable film (A') and laser-cuttable film (B')>
The laser-cuttable film (A') and the laser-cuttable film (B') are layers that are selectively provided when imparting gas barrier properties, etc. to the packaging bag. When the laser-cuttable film (A') and the laser-cuttable film (B') are located outside the glossy printed layer, the laser-cuttable film (A') and the laser-cuttable film (B') are made of a light-transmitting material so that the glossy printed layer can be visually recognized from the outside.

Laser-cuttable film (A') and laser-cuttable film (B') have the property of absorbing laser light from a carbon dioxide laser and evaporating.

Examples of materials for the laser-cuttable film (A') and the laser-cuttable film (B') that can be applied to the present invention include materials of the same kind as the laser-cuttable film (A) and the laser-cuttable film (B'). The laser-cuttable film (A) and the laser-cuttable film (A') may be made of the same kind of material or different materials. The laser-cuttable film (B) and the laser-cuttable film (B') may be made of the same kind of material or different materials.

The laser-cuttable film (A') and the laser-cuttable film (B') may be uniaxially or biaxially stretched. The laser-cuttable film (A') and the laser-cuttable film (B') may be a composite film in which two or more of the above resin films are laminated. The composite film may be formed by an inflation method or a melt extrusion coating method.

The thickness of the laser-cuttable film (A') and the laser-cuttable film (B') is not particularly limited, and can be set appropriately depending on the application of the packaging bag, as long as it does not exceed the total thickness of the packaging bag described above. Specifically, the thickness is usually preferably about 5 μm to 50 μm, more preferably 7 μm to 40 μm, and even more preferably 9 μm to 30 μm.

<Laser-uncuttable film (A) and laser-uncuttable film (B)>
The laser-non-cuttable film (A) and the laser-non-cuttable film (B) are in direct contact with the packaged item and play a role in protecting the packaged item. When applied to the packaging bag of the present invention, the laser-non-cuttable film (A) and the laser-non-cuttable film (B) preferably have heat sealability. Furthermore, when the packaging bag of the present invention is used for a container that contains a liquid packaged item, the laser-non-cuttable film (A) and the laser-non-cuttable film (B) are preferably made of a material that is impermeable to the liquid.

Laser-uncuttable film (A) and laser-uncuttable film (B) have no absorption band in the wavelength range of the laser light emitted by a carbon dioxide laser, and therefore have the property of not being cut even when irradiated with the laser light.

Examples of materials constituting the laser-uncuttable film (A) and the laser-uncuttable film (B) include polyolefin resins such as low-density PE (LDPE), linear low-density PE (LLDPE), medium-density PE (MDPE), high-density PE (HDPE), ethylene-vinyl acetate copolymer, propylene homopolymer, ethylene-propylene block copolymer, and ethylene-propylene random copolymer. One or more of these resins can be used. In addition, the laser-uncuttable film (A) and the laser-uncuttable film (B) are preferably unstretched films made of the above-mentioned resins in order to suppress shrinkage during heat sealing. When the packaging material is used for packaging containers for microwave heating or retort, the laser-uncuttable film (A) and the laser-uncuttable film (B) are preferably made of resins with excellent heat resistance (e.g., propylene-based resins and HDPE) in order to increase heat resistance.

The laser-non-cuttable film (A) and the laser-non-cuttable film (B) may be composed of a single layer or may be composed of two or more layers.

The thickness of the laser non-cuttable film (A) and the laser non-cuttable film (B) is not particularly limited, and is set appropriately depending on the application of the packaging bag, etc., within a range that does not exceed the total thickness of the packaging bag described above. The thickness of the laser non-cuttable film (A) is usually preferably about 10 μm to 200 μm, more preferably 20 μm to 150 μm, and even more preferably 30 μm to 100 μm.

<Printed layer>
The printed layer includes a glittering printed layer and a picture printed layer.
The laminate A may have only a glittering printed layer, or may have a picture printed layer on the outer layer of the glittering printed layer. Alternatively, the laminate A may have a pattern-shaped glittering printed layer and a picture printed layer in parallel with the glittering printed layer.
The laminate B may have only a picture print layer or only a glitter print layer. As with the laminate A, it may have a picture print layer on the outer layer of the glitter print layer, or it may have a pattern-shaped glitter print layer and a picture print layer in parallel with the glitter print layer.

<<Glitter printing layer>>
The glittering printed layer is a layer containing a glittering pigment and a binder resin. The glittering printed layer may be formed on the entire surface of the packaging material. Alternatively, the glittering printed layer may be formed on only a part of the packaging bag. The mark may be formed as a picture such as a letter, a figure, a symbol, a design, or a pattern.

The thickness of the glossy printing layer is preferably 0.1 μm to 8.0 μm, and more preferably 0.3 μm to 5.0 μm, in order to ensure that the metallic luster is sufficiently noticeable.

(Photoluminescent pigment)
The luster pigment preferably contains at least one selected from metal flakes and pearl pigments, such as white pearl pigments, interference pearl pigments, and colored pearl pigments.

White pearl pigments are made by covering a scaly base material such as mica, aluminum, or glass with a coating layer made of a colorless, high-refractive index material such as titanium dioxide. The coating layer is relatively thin, at around 0.1 to 0.15 μm, and reflects almost all wavelengths of light, making it appear white or silvery.

Interference pearl pigments have a coating layer made of a colorless, high refractive index material such as titanium dioxide, and the thickness of the coating layer is greater than that of white pearl pigments, exceeding 0.15 μm. Depending on the thickness, the reflected and transmitted light changes, resulting in various interference colors. They are sometimes called iridescent pearls.

Colored pearl pigments are chromatic, and include those with a coating layer made of a colored high refractive index material such as ferric oxide, those with a white pearl pigment further coated with a colored high refractive index material such as ferric oxide or other colored pigments, and those with pigments or other colorants added to the coating layer.

The average length of the pearl pigment is preferably 5 μm to 70 μm, and more preferably 10 μm to 40 μm.

The average length of the pearl pigment and the average length of the metal flakes are calculated as the average length of any 20 particles (pearl pigment or metal flakes) observed with an optical microscope or electron microscope from the planar direction of laminate A or laminate B. The length of one pearl pigment and one metal flake means the maximum length of one pearl pigment and one metal flake in the planar direction.

The average thickness of the pearl pigment is preferably 0.01 μm to 1 μm, more preferably 0.02 μm to 0.7 μm, and even more preferably 0.05 μm to 0.5 μm.

The average thickness of the pearl pigment and metal flakes is determined as the average thickness of any 20 particles (pearl pigment or metal flakes) observed by optical or electron microscopy of the cross section of the laminate (Laminate A, Laminate B). The thickness of one pearl pigment and one metal flake is determined by dividing the cross section of one pearl pigment and one metal flake into five regions with equal lengths in the longitudinal direction, measuring the thickness ( _t1 , _t2 , _t3 , _t4 , _t5 ) of the center of each region, and averaging _t1 to _t5 .

From the viewpoint of increasing gloss and coating strength, the content of the pearl pigment in the glittering print layer is preferably 40 to 90% by mass, more preferably 50 to 85% by mass, and even more preferably 60 to 80% by mass, of the total solid content of the glittering print layer.

Materials for the metal flakes include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel-chromium, and stainless steel.

The metal flakes can be, for example, those obtained by vacuum-depositing the metal or alloy on a plastic film, peeling off the thin metal film from the plastic film, and crushing and stirring the peeled thin metal film, those obtained by mixing a powder of the metal or alloy with a solvent and spreading and/or crushing the powder using a media stirring mill, ball mill, attritor, or the like, or those whose surfaces are coated with resin.

The metal flakes may be non-leafing type or leafing type. When the packaging bag is to be used in a microwave oven, it is preferable to use non-leafing type metal flakes in order to easily avoid contact between the metal flakes.

Non-leafing type metal flakes are uniformly dispersed within the layer during the formation process of the glossy printing layer. Non-leafing type metal flakes are metal flakes that have not been surface-treated with stearic acid, and examples of such metal flakes include metal flakes that have been surface-treated with a surface treatment agent other than stearic acid, such as oleic acid, and metal flakes that have not been surface-treated.

Leafing-type metal flakes are omnipresent at the top of the glossy print layer because the metal flakes rise to the top of the layer during the formation process of the glossy print layer. This results in a high level of metallic luster. Leafing-type metal flakes are metal flakes that have been surface-treated with stearic acid.

The metal flakes are preferably ones whose surfaces are resin-coated. Resin-coated metal flakes can be produced, for example, by the methods described in JP-A-62-253668, JP-A-64-40566, JP-A-2003-213157, and JP-A-2012-241039.

The metal flakes preferably have an average length of 1 μm to 50 μm, more preferably 2 μm to 40 μm, and even more preferably 5 μm to 30 μm. From the viewpoint of ease of handling and obtaining high metallic luster, the average thickness is preferably 0.01 μm to 5 μm, more preferably 0.02 μm to 3 μm, and even more preferably 0.05 μm to 1 μm.

From the viewpoint of obtaining a good metallic luster, the content of the metal flakes in the glossy printing layer is preferably 3% by mass or more and 50% by mass or less of the total solid content of the glossy printing layer, more preferably 3% by mass or more and less than 40% by mass, and even more preferably 10% by mass or more and 30% by mass or less.

The aspect ratio (average length/average thickness) of the glittering pigments such as pearl pigments and metal flakes is preferably 15 to 500. By keeping it within the above range, it is possible to form a glittering print layer with a good metallic luster while suppressing the inclination of the pigment in the glittering print layer.

(Binder resin)
Examples of binder resins include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly(meth)acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, vinyl chloride-vinyl acetate copolymers, polystyrene resins, styrene-butadiene copolymers, vinylidene fluoride resins, polyvinyl alcohol resins, polyvinyl acetal resins, polyvinyl butyral resins, polybutadiene resins, polyester resins, polyamide resins, alkyd resins, epoxy resins, unsaturated polyester resins, thermosetting poly(meth)acrylic resins, melamine resins, urea resins, polyurethane resins, phenolic resins, xylene resins, maleic acid resins, cellulose resins such as nitrocellulose, ethyl cellulose, acetyl butyl cellulose, and ethyloxyethyl cellulose, rubber resins such as chlorinated rubber and cyclized rubber, petroleum resins, and natural resins such as rosin and casein.

In addition, when the packaging bag is for retort use, from the viewpoint of preventing the flow of the photoluminescent pigment in the glossy printed layer during retort processing and preventing contact between the photoluminescent pigments (especially between the metal flakes), a melting point of 130°C or higher is preferable. The melting point of the binder resin in the glossy printed layer is more preferably 140°C or higher, and even more preferably 150°C or higher. In this specification, a resin with a melting point of AA°C or higher includes not only resins with melting points observed at AA°C or higher, but also resins with melting points below AA°C and not observed at AA°C or higher.

(Other ingredients)
The glossy printing layer may further contain any additives as necessary, such as fillers, stabilizers, plasticizers, antioxidants, light stabilizers such as ultraviolet absorbers, dispersants, thickeners, drying agents, lubricants, antistatic agents, crosslinking agents, etc.

The glossy print layer may also contain colorants to enhance the design. General-purpose dyes and pigments (e.g., inorganic pigments such as yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, and cobalt blue, and organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue) can be used as colorants. From the viewpoint of microwave resistance, it is preferable to use only small amounts of colorants with low insulating properties, such as carbon black.

When the colorant is a pigment, the average particle size is preferably 250 nm or less. By making the average particle size of the pigment 250 nm or less, light diffusion by the pigment can be suppressed, making it easier to achieve good metallic luster. The average particle size of the pigment is determined as the mass average value d50 in particle size distribution measurement by laser light diffraction method.

The content of the colorant is preferably 10 to 70 parts by mass, more preferably 20 to 60 parts by mass, and even more preferably 30 to 50 parts by mass, per 100 parts by mass of the glitter pigment.

The glittering print layer may contain inorganic fine particles with an average particle size of 1 nm to 100 nm. Examples of inorganic fine particles include silica, alumina, zirconia, and titania. Among these, silica, which has excellent transparency, is preferred.

The average particle size of the inorganic fine particles is preferably 2 nm to 50 nm, and more preferably 5 to 30 nm. The average particle size of the inorganic fine particles is determined as the mass average value d50 in particle size distribution measurement by laser light diffraction method.

The content of inorganic fine particles in the glittering print layer is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, and even more preferably 20 to 35 parts by mass, per 100 parts by mass of the glittering pigment.

(Ink for glittering printing layer)
The glossy printed layer can be formed on the laser-cuttable film (A) or the laser-cuttable film (B) using an ink for the glossy printed layer by a known printing method such as gravure printing, offset printing, letterpress printing, or silk screen printing.
The ink for the glittering printing layer is composed mainly of a vehicle consisting of a binder resin and a solvent, to which the above glittering pigment is added and mixed. The above additives can be further added to the ink for the glittering printing layer as necessary.

As the solvent contained in the ink for the glittering printing layer, solvents used in ordinary pigment inks can be applied. For example, alcohol-based solvents such as methanol, ethanol, normal propanol, isopropanol, and propylene glycol monomethyl ether, ketone-based solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, ester-based solvents such as methyl acetate, ethyl acetate, and normal propyl acetate, aliphatic hydrocarbon-based solvents such as normal hexane, normal heptane, and normal octane, alicyclic hydrocarbon-based solvents such as cyclohexane, methylcyclohexane, and cycloheptane, aromatic solvents such as toluene and xylene, and mineral spirits. These may be used alone or in combination of two or more. Of these, it is preferable that aromatic solvents are not included from the viewpoint of the working environment during printing and food hygiene, etc.

The above-mentioned additives, colorants, and inorganic fine particles can be added to the ink for the glossy printing layer as necessary.

＜＜Pattern printing layer＞＞
The pattern printing layer is a layer that does not contain a glittering pigment, unlike the glittering printing layer. The pattern printing layer may be formed on a part of the surface of the packaging material, or may be formed on the entire surface. As described above, there is no restriction on the positional relationship between the pattern printing layer and the glittering printing layer, but in order to prevent the glossiness of the glittering printing layer from being reduced by the solvent contained in the coating liquid for forming the pattern printing layer, it is preferable to form the pattern printing layer in parallel with the glittering printing layer.

The picture print layer is preferably a print layer formed with a color that can be distinguished from the glitter print layer, and is a broad concept including characters, figures, symbols, designs, patterns, solid prints, etc. As the colorant for the picture print layer 3b, general-purpose dyes and pigments (for example, inorganic pigments such as yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, cobalt blue, etc., and organic pigments or dyes such as quinacridone red, isoindolinone yellow, phthalocyanine blue, etc.) can be used.
The thickness of the picture print layer is not particularly limited, but is preferably about 1.0 μm to 5 μm, and more preferably 1.0 μm to 3 μm.

<Gas Barrier Layer>
The gas barrier layer can be provided between the laser-cuttable film (A) and the laser-uncuttable film (A), and between the laser-cuttable film (B) and the laser-uncuttable film (B) as necessary. The gas barrier layer plays a role in blocking the transmission of oxygen, water vapor, and the like between the packaged item and the external environment of the packaging material. The gas barrier layer may be composed of only one layer, or may be composed of two or more layers. When composed of two or more layers, it may be composed of a laminate of a vapor deposition film and a gas barrier coating film, which will be described later.
In the present invention, it is preferable that the gas barrier layer does not include a metal vapor deposition film, and it is also preferable that a metal foil is not used as the gas barrier layer.
From the viewpoint of improving the adhesion of the gas barrier layer, the surface on which the gas barrier layer is to be formed may be subjected to a surface treatment in advance, such as a corona discharge treatment, an ozone treatment, a low-temperature plasma treatment using oxygen gas, nitrogen gas or the like, a glow discharge treatment, an oxidizing agent treatment, application of an anchor coating agent, etc.

<<Vapor-deposited film>>
The vapor deposition film, which is an example of the gas barrier layer, can be formed from an inorganic substance such as silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), or an oxide thereof. Among these, silicon oxide or aluminum oxide is preferable.

Examples of methods for forming a vapor-deposited film include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition.
The vapor-deposited film disposed on the outer layer side of the glittering printed layer and the picture printed layer is preferably a vapor-deposited film of an inorganic oxide from the viewpoint of visibility of the glittering printed layer and the picture printed layer.

The thickness of the deposited film varies depending on the material used and the required gas barrier performance, but is usually preferably about 5 nm to 200 nm, more preferably 5 nm to 150 nm, and even more preferably 10 nm to 100 nm. In the case of inorganic oxides such as silicon oxide and aluminum oxide, the thickness is preferably about 5 nm to 100 nm, more preferably 5 nm to 50 nm, and even more preferably 10 nm to 30 nm.

<<Gas barrier coating film>>
A gas barrier coating film, which is an example of a gas barrier layer, can be formed, for example, by applying a coating liquid obtained by polycondensing at least one alkoxide represented by the general formula R ¹ _n M(OR ² ) _m (wherein R ¹ and R ² are organic groups having 1 to 8 carbon atoms, M is a metal atom, n is an integer of 0 or more, m is an integer of 1 or more, and n+m is the atomic valence of M) and a polyvinyl alcohol resin and/or an ethylene-vinyl alcohol copolymer by a sol-gel method in the presence of a sol-gel catalyst, an acid, water and an organic solvent, and then heat-treating the resulting coating at 50 to 300° C. for 0.05 to 60 minutes.

The coating method can be, for example, roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brush coating, bar coating, applicator, etc. After one or more coatings, the dry thickness of the coating film is preferably about 0.01 μm to 30 μm, more preferably 0.05 μm to 20 μm, and even more preferably 0.1 μm to 10 μm.
From the viewpoint of improving the gas barrier property, the gas barrier coating film is preferably formed on the surface of the vapor-deposited film.

<Adhesive Layer>
In the laminate A and laminate B of the present invention, each of the constituent layers is preferably laminated via an adhesive layer from the viewpoint of improving the bonding strength between the layers. The adhesive layer can be formed by a method using a known dry lamination adhesive or by extrusion lamination.

Examples of adhesives for dry lamination include polyvinyl acetate adhesives, polyacrylic ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives such as urea resin and melamine resin, phenol resin adhesives, epoxy adhesives, polyurethane adhesives (for example, cured products of polyol and isocyanate compounds), reactive (meth)acrylic acid adhesives, rubber adhesives such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, silicone adhesives, and inorganic adhesives such as alkali metal silicates and low melting point glass.
The thickness of the adhesive layer formed by dry lamination is preferably 1 μm to 4 μm, and more preferably 2 μm to 3 μm.

Examples of resins used for the adhesive layer by extrusion lamination include polyethylene, polypropylene, and polybutylene terephthalate.
When the adhesive layer is formed by extrusion lamination, a known anchor coat layer may be formed. The thickness of the adhesive layer formed by extrusion lamination is preferably 0.1 μm to 2.0 μm, and more preferably 0.3 μm to 1.5 μm.

The laminate A may have the following structures (1) to (4), for example: In the structures (1) to (4), the left-hand layer is the outer layer, and "/" indicates the boundary between layers.
(1) Laser-cuttable film/photoluminescent printed layer/adhesive layer/laser-uncuttable film (2) Laser-cuttable film/photoluminescent printed layer/adhesive layer/laser-cuttable film/adhesive layer/laser-uncuttable film (3) Photoluminescent printed layer/laser-cuttable film/adhesive layer/laser-uncuttable film (4) Photoluminescent printed layer/laser-cuttable film/adhesive layer/laser-cuttable film/adhesive layer/laser-uncuttable film

Next, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.

1. Measurement and Evaluation The packaging bags of each of the Examples and Comparative Examples were evaluated as follows.

1-1. Aesthetic Appearance Due to Metallic Luster The appearance of the packaging bags of the Examples and Comparative Examples was observed while tilting them in various directions, and the aesthetic appearance due to metallic luster was evaluated.
Twenty subjects gave evaluations, with scores of 3 for cases where the metallic luster could be felt and the aesthetics based on the metallic luster were good, 2 for cases where it was neither good nor bad, and 1 for cases where the metallic luster could not be felt and the aesthetics were insufficient. The average scores were calculated and compared against the following evaluation criteria. The results are shown in Table 1.
<Evaluation criteria>
A: Average score is 2.5 or more B: Average score is more than 2.0 and less than 2.5 C: Average score is 2.0 or less

1-2. Laser Penetration Property The front and back sides of the packaging bags of the Examples and Comparative Examples were observed, and the presence or absence of incisions (score lines) caused by irradiation with a laser beam was visually confirmed.
Those having clear engravings on both the front and back sides were rated as A, and those with no engravings on the back side were rated as C. The results are shown in Table 1.

1-3. Openability The packaging bags of the Examples and Comparative Examples were torn along the extending direction of the incisions (score lines) to evaluate the openability.
A sample that was easily torn along the incisions was given a score of 3, a sample that could be torn almost along the incisions but had a rough cut surface was given a score of 2, and a sample that was torn in a direction different from the extension direction of the incisions, required a large force to tear, and had a rough cut surface was given a score of 1. The above evaluation was performed on 10 samples, and the average score was calculated. The obtained average score was evaluated against the following evaluation criteria. The results are shown in Table 1.
<Evaluation criteria>
A: Average score is 2.5 or more B: Average score is more than 2.0 and less than 2.5 C: Average score is more than 1.5 and less than 2.0 D: Average score is less than 1.5

2. Preparation of packaging bag [Example 1]
The following ink for the glossy printing layer was applied by gravure printing to one surface of a 12 μm thick polyethylene terephthalate film (PET film, one side corona treated), and dried to form a glossy printing layer with a thickness (after drying) of 3 μm.
<Ink for glittering printing layer>
Composition containing metal flakes and mineral spirits: 9 parts by weight (metal flake content: 85% by weight)
(Metal flakes: non-leafing type aluminum flakes, aspect ratio 20, average thickness 0.20 μm)
Organic yellow pigment: 3 parts by weight (average particle size: 150 nm)
Inorganic fine particles: 2 parts by weight (silica, average particle size: 20 nm)
Binder resin: 20 parts by weight (polyurethane resin, melting point 140°C)
Solvent 1 (mixed solvent of propylene glycol monomethyl ether, normal propyl acetate, ethyl acetate, and isopropanol) 70 parts by mass Solvent 2 (mineral spirits) 6 parts by mass An adhesive layer-forming coating liquid containing a polyol and an isocyanate compound was applied to a non-axially stretched polypropylene film (hereinafter referred to as "CPP film", a single layer film of an ethylene-propylene block copolymer, thickness 30 μm), and dried to form an adhesive layer with a thickness of 3 μm.
The PET film, the glittering print layer, the adhesive layer, and the CPP film were laminated in this order and dry laminated to obtain a laminate A (A-1). The thickness of the laminate A-1 was 48 μm.
The laminate A-1 was heat sealed with the CPP film as the inner layer to form a bottom seal, a top seal and a back seal, to form a packaging bag (pillow bag) of the shape shown in FIG.

A carbon dioxide laser was used to irradiate the front side of the packaging bag (the side where the back seal portion was not formed) with laser light (wavelength: 10.6 μm to 10.9 μm) at the position shown in Figure 1, and a cut line (continuous line) was engraved across the entire width of the pillow bag when viewed from the front side. The laser irradiation conditions were as follows. In this way, the packaging bag of Example 1 was obtained.
Output: 18W
・Sweep speed: 2000mm/sec

[Example 2]
The same ink for the glossy printing layer as in Example 1 was applied by gravure printing to one surface of a 15 μm thick nylon film (hereinafter referred to as "Ny film", one-sided corona treatment), and dried to form a glossy printing layer with a thickness (after drying) of 3 μm.
The same adhesive layer-forming coating liquid as in Example 1 was applied to a polyethylene film (hereinafter sometimes referred to as "PEF", one-sided corona treatment, thickness 120 μm) and dried to form an adhesive layer with a thickness of 3 μm.
The Ny film, the glittering print layer, the adhesive layer, and the polyethylene film were laminated in this order and dry laminated to obtain a laminate A (A-2). The thickness of the laminate A-2 was 141 μm.

Using the laminate A-2, a bottom seal, a top seal and a back seal were formed with a polyethylene film as an inner layer to form a pillow bag having the shape shown in FIG.
Further, score lines were engraved under the same conditions as in Example 1 to obtain a packaging bag of Example 2.

[Example 3]
As in Example 1, a glittering printed layer having a thickness (after drying) of 3 μm was formed on a PET film (PET film 1) having a thickness of 12 μm.
The same PET film (thickness 12 μm, PET film 2) was separately prepared, and the same adhesive layer forming coating liquid as in Example 1 was applied to one surface of the PET film 2 and dried to form an adhesive layer having a thickness of 3 μm.
As in Example 1, an adhesive layer having a thickness (after drying) of 3 μm was formed on a CPP film having a thickness of 30 μm.
The PET film 1, the glittering print layer, the adhesive layer, the PET film 2, the adhesive layer, and the CPP film were laminated in this order, and then dry laminated to obtain a laminate A (A-3). The thickness of the laminate A-3 was 63 μm.

Using the laminate A-3, a pillow bag having the shape shown in FIG. 1 was formed by forming the bottom seal, top seal and back seal with the CPP film as the inner layer.
Further, score lines were engraved under the same conditions as in Example 1 to obtain a packaging bag of Example 3.

[Example 4]
As in Example 2, a glittering print layer with a thickness (after drying) of 3 μm was formed on a 15 μm-thick Ny film. A urethane adhesive (manufactured by Toyo-Morton Co., Ltd., base agent: EL-510, curing agent: CAT-RT80) was applied as an ink for the anchor coat layer onto the glittering print layer, and then dried to form an anchor coat layer with a thickness of 1 μm.
Molten polyethylene resin was extruded between the anchor coat layer of the Ny film and a polyethylene film having a thickness of 40 μm to form an adhesive layer (film thickness after curing: 15 μm), and each film was laminated. This resulted in a laminate A (A-4) in which the Ny film, the glittering print layer, the anchor coat layer, the adhesive layer, and the polyethylene film were laminated in this order. The thickness of the laminate A-4 was 74 μm.

Using the laminate A-4, a bottom seal, a top seal and a back seal were formed with a polyethylene film as an inner layer to form a pillow bag having the shape shown in FIG.
Further, score lines were engraved under the same conditions as in Example 1 to obtain a packaging bag of Example 4.

[Example 5]
A glossy printed layer having a thickness (after drying) of 3 μm was formed on a PET film having a thickness of 12 μm in the same manner as in Example 1. The ink for the anchor coat layer having the above formulation was applied onto the glossy printed layer and dried to form an anchor coat layer having a thickness of 1 μm.
The ink for the anchor coat layer having the above formulation was applied onto a 15 μm thick Ny film and dried to form an anchor coat layer having a thickness of 1 μm.
Molten polyethylene resin was extruded between the anchor coat layer of the PET film and the Ny film, and between the anchor coat layer of the Ny film and the polyethylene film (thickness: 60 μm) to form an adhesive layer (film thickness after curing: 15 μm), and each film was laminated. This resulted in a laminate A (A-5) in which the PET film, the glittering print layer, the anchor coat layer, the adhesive layer, the Ny film, the anchor coat layer, the adhesive layer, and the polyethylene film were laminated in this order. The thickness of the laminate A-5 was 122 μm.

Using the laminate A-5, a bottom seal, a top seal and a back seal were formed with a polyethylene film as an inner layer to form a pillow bag having the shape shown in FIG.
Further, score lines were engraved under the same conditions as in Example 1 to obtain a packaging bag of Example 5.

[Comparative Example 1]
Except for using a polyethylene film having a thickness of 140 μm, a laminate C (C-1) was obtained by the same process as in Example 2. The thickness of the laminate C-1 was 161 μm.

Using the laminate C-1, a bottom seal, a top seal and a back seal were formed with a polyethylene film as an inner layer to form a pillow bag having the shape shown in FIG.
Furthermore, score lines were engraved under the same conditions as in Example 1 to obtain a packaging bag of Comparative Example 1.

[Comparative Example 2]
A laminate C (C-2) was obtained by the same process as in Example 3, except that a PET film having a thickness of 25 μm was used as the PET films 1 and 2, and a polyethylene film (thickness: 120 μm) was used instead of the CPP film. The thickness of the laminate C-2 was 179 μm.

[Comparative Example 3]
An aluminum vapor deposition film having a thickness of 20 nm was formed on the surface of the same PET film as in Example 1. Then, in the same process as in Example 1, each film was laminated in the order of the PET film, the aluminum vapor deposition film, the adhesive layer (thickness: 3 μm), and the CPP film (thickness: 30 μm), and dry laminated to obtain a laminate D (D-1). The thickness of the laminate D-1 was 45 μm.

[Example 6]
An ink for a pattern printed layer (manufactured by DIC Graphics Corporation, product name "Finart") was applied to the entire surface of one side of a 12 μm thick PET film (corona treated on one side) by gravure printing, and then dried to form a pattern printed layer with a film thickness (after drying) of 3 μm.
Using the same process as in Example 1, an adhesive layer having a thickness of 3 μm was formed on a CPP film having a thickness of 50 μm.
The PET film, the pattern printed layer, the adhesive layer, and the CPP film were laminated in this order, and then dry laminated to obtain a laminate B (B-1). The thickness of the laminate B-1 was 68 μm.

The laminate A-1 and the laminate B-1 were laminated together with their CPP films on the inner side, and the periphery was heat sealed to prepare a four-side sealed bag.
Laser light from a carbon dioxide laser was irradiated from the surface side of the laminate A-1 of the packaging bag under the same conditions as in Example 1 to carve a slit line. The slit line was provided so as to be approximately parallel to the top seal portion and to span the entire width of the four-sided sealed bag. In this way, the packaging bag of Example 6 was obtained. The total thickness of the packaging material of Example 6 was 116 μm.

[Example 7]
The same ink for the design layer as in Example 6 was applied to the entire surface of one surface of a 15 μm thick Ny film (one side corona treated) by gravure printing, and then dried to form a glossy printed layer with a thickness (after drying) of 3 μm.
The same adhesive layer-forming coating liquid as in Example 1 was applied onto a polyethylene film having a thickness of 120 μm, and then dried to form an adhesive layer having a thickness of 3 μm.
The Ny film, the pattern printed layer, the adhesive layer, and the polyethylene film were laminated in this order, and then dry laminated to obtain a laminate B (B-2). The thickness of the laminate B-2 was 141 μm.

The laminate A-2 and the laminate B-2 were laminated together with the polyethylene films on the inner sides, and the periphery was heat-sealed to prepare a four-side sealed bag.
Laser light was applied from the surface side of the laminate A-2 of the packaging bag under the same conditions as in Example 1 using a carbon dioxide laser to carve a cut line similar to that in Example 6. This resulted in the packaging bag of Example 7. The total thickness of the packaging material of Example 7 was 282 μm.

[Example 8]
The laminate A-3 and the laminate B-1 were laminated together with their CPP films on the inner side, and the periphery was heat sealed to prepare a four-side sealed bag.
A carbon dioxide laser was irradiated from the surface side of the laminate A-3 of the packaging bag under the same conditions as in Example 1 to carve a cut line similar to that in Example 6. This produced the packaging bag of Example 8. The total thickness of the packaging material of Example 8 was 131 μm.

[Example 9]
The laminate A-4 and the laminate B-2 were laminated together with the polyethylene film of each serving as the inner layer, and the periphery was heat-sealed to prepare a four-side sealed bag.
A carbon dioxide laser was irradiated from the surface side of the laminate A-4 of the packaging bag under the same conditions as in Example 1 to carve a cut line similar to that in Example 6. This produced the packaging bag of Example 9. The total thickness of the packaging material of Example 9 was 215 μm.

[Example 10]
A laminate B (B-3) was obtained in the same manner as in Example 6, except that the CPP film was replaced with a polyethylene film (thickness: 120 μm). The thickness of the laminate B-3 was 138 μm.
The laminate A-5 and the laminate B-3 were laminated together with the polyethylene film of each serving as the inner layer, and the periphery was heat-sealed to prepare a four-side sealed bag.
Laser light was applied from the surface side of the laminate A-5 of the packaging bag under the same conditions as in Example 1 using a carbon dioxide laser to carve a cut line similar to that in Example 6. This resulted in the packaging bag of Example 10. The total thickness of the packaging material of Example 10 was 260 μm.

[Comparative Example 4]
A laminate B (B-4) was obtained in the same manner as in Example 7, except that the thickness of the polyethylene film was changed to 130 μm. The thickness of the laminate B-4 was 151 μm.

The laminate C-1 and the laminate B-4 were laminated together with the polyethylene film of each laminate on the inner side, and the peripheral edges were heat sealed to prepare a four-side sealed bag.
Laser light was applied from the surface side of the laminate C-1 of the packaging bag using a carbon dioxide laser under the same conditions as in Example 1 to carve a cut line similar to that in Example 6. This resulted in the packaging bag of Comparative Example 4. The total thickness of the packaging material of Comparative Example 4 was 312 μm.

[Comparative Example 5]
A laminate B (B-5) was obtained in the same manner as in Example 6, except that the CPP film was replaced with a polyethylene film (thickness: 130 μm). The thickness of the laminate B-5 was 148 μm.
The laminate C-2 and the laminate B-5 were laminated together with the polyethylene film of each laminate on the inner side, and the peripheral edges were heat sealed to prepare a four-side sealed bag.
Laser light was applied from the surface side of the laminate C-2 of the packaging bag under the same conditions as in Example 1 using a carbon dioxide laser to carve a cut line similar to that in Example 6. This resulted in the packaging bag of Comparative Example 5. The total thickness of the packaging material of Comparative Example 5 was 327 μm.

[Comparative Example 6]
The laminate D-1 and the laminate B-1 were laminated together with their CPP films on the inner side, and the periphery was heat sealed to prepare a four-side sealed bag.
Laser light was applied from the surface side of the laminate C-1 of the packaging bag using a carbon dioxide laser under the same conditions as in Example 1 to carve a cut line similar to that in Example 6. This resulted in the packaging bag of Comparative Example 6. The total thickness of the packaging material of Comparative Example 6 was 113 μm.

Table 1 shows the configuration of laminate A in Examples 1 to 5 and Comparative Examples 1 to 3, the total thickness when made into a packaging bag, and the evaluation results. Table 2 shows the configuration of laminate A and laminate B in Examples 6 to 10 and Comparative Examples 4 to 6, the total thickness when made into a packaging bag, and the evaluation results.

It was confirmed that all of the packaging bags of Examples 1 to 10 had metallic luster comparable to that of packaging bags using conventional aluminum vapor deposition films (Comparative Examples 3 and 6). In addition, by irradiating one side with laser light from a carbon dioxide laser, cut lines were engraved not only on the irradiated side but also on the opposite side. This resulted in excellent openability. Examples 1, 3 to 4, 6, and 8, which had a relatively thin total thickness, were particularly excellent in openability. Furthermore, Example 5 had better openability than Example 2. Example 9 had better openability than Examples 7 and 10.
Comparative Examples 1 to 2 and 4 to 5 had metallic luster, but no clear cut line was formed on the side opposite to the laser light irradiated surface, resulting in poor openability.

10. Pillow bag (packaging bag)
12 Lower seal portion 14 Upper seal portion 16 Back seal portion 20, 120 Non-adhesive area (storage space)
22, 122 Laser processing area 30, 40, 50, 60 Laminate A
32 Laser-non-cuttable film (A)
34 Glossy printed layer 36 Laser-cuttable film (A)
100, 160 Pouch (packaging bag)
116 Adhesive area 132 Laser non-cuttable film (B)
136 Laser cut film (B)
130, 140, 150 Laminate B

Claims (3)

A method for producing a packaging bag including a laminate A comprising a laser-cuttable film (A) and a laser-non-cuttable film (A),
The laminate A includes a glossy printed layer between the laser-cuttable film (A) and the laser-non-cuttable film (A) or on the opposite side of the laser-cuttable film (A) to the laser-non-cuttable film (A),
The glittering printed layer contains at least one selected from metal flakes and pearl pigments,
The packaging bag has an adhesive region in which the laser-non-cuttable films (A) are partially adhered to each other as an inner layer side, and a non-adhesive region for accommodating an item to be contained,
The total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less,
a region in which the laser-cuttable film (A) is cut and the laser-non-cuttable film (A) is not cut in a part of the non-adhesive region;
a step of partially bonding the laser-non-cuttable films (A) to each other as inner layers to form an adhesive region of the laminate A where the laser-non-cuttable films (A) are bonded and a non-adhesive region for accommodating an object to be accommodated;
a step of irradiating laser light from one side of the laser-cuttable film (A) using a carbon dioxide laser, so that, in the laminate A on the side irradiated with the laser light, the laser-cuttable film (A) is cut in the thickness direction of a part of the plane of the packaging bag to form an area in which the laser-non-cuttable film (A) is not cut, and, in the laminate A on the side opposite to the side irradiated with the laser light, the laser-cuttable film (A) is cut in the thickness direction of a part of the plane of the packaging bag to form an area in which the laser-non-cuttable film (A) is not cut;
A method for manufacturing a packaging bag comprising the steps of: A method for producing a packaging bag including a laminate A comprising a laser-cuttable film (A) and a laser-non-cuttable film (A), and a laminate B comprising a laser-cuttable film (B) and a laser-non-cuttable film (B), comprising:
The laminate A includes a glossy printed layer between the laser-cuttable film (A) and the laser-non-cuttable film (A) or on the opposite side of the laser-cuttable film (A) to the laser-non-cuttable film (A),
The packaging bag is arranged so that the laser-non-cuttable film (A) and the laser-non-cuttable film (B) are on the inner layer side, and has an adhesive region in which the laser-non-cuttable film (A) and the laser-non-cuttable film (B) are partially adhered to each other, and a non-adhesive region for accommodating an item to be contained,
The glittering printed layer contains at least one selected from metal flakes and pearl pigments,
The total thickness of the packaging bag in the non-adhesive region is 60 μm or more and 300 μm or less,
a region in which the laser-cuttable film (A) and the laser-cuttable film (B) are cut and the laser-non-cuttable film (A) and the laser-non-cuttable film (B) are not cut in a part of the non-adhesive region;
a step of arranging the laser-uncuttable film (A) of the laminate A and the laser-uncuttable film (B) of the laminate B so as to face each other and be inner layers, and partially bonding the laser-uncuttable film (A) and the laser-uncuttable film (B) to form an adhesive region where the laser-uncuttable film (A) and the laser-uncuttable film (B) are bonded, and a non-adhesive region for accommodating an object to be accommodated;
a step of irradiating laser light from the side of the laser-cuttable film (A) or the side of the laser-cuttable film (B) using a carbon dioxide laser to cut the laser-cuttable film (A) in a thickness direction of a part of the plane of the packaging bag to form an area in which the laser-non-cuttable film (A) is not cut, and cutting the laser-cuttable film (B) in the thickness direction of a part of the plane of the packaging bag to form an area in which the laser-non-cuttable film (B) is not cut;
A method for manufacturing a packaging bag comprising the steps of: The method for producing a packaging bag according to claim 1 or 2 , wherein the output of the carbon dioxide gas laser is 20 W or more and 40 W or less.