JP6662095B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag. In particular, the present invention relates to a packaging bag which can be heated using a microwave oven and can suitably cook food without opening the packaging bag.

  2. Description of the Related Art Conventionally, food in a packaging bag, in which a cooked or semi-cooked food is stored in a packaging bag at room temperature, low temperature, or frozen storage, and can be cooked by heating in a microwave oven without opening. It has been known.

  If the packaging bag is heated in a microwave oven without being opened, the moisture in the packaging container becomes water vapor and the volume of the packaging bag increases. Therefore, if there is no gap through which the water vapor can escape, there is a risk of rupture or the like.

  On the other hand, when the content is in a semi-cooked state, it may be necessary to steam the generated steam instead of simply heating. In this case, it is necessary to appropriately design a mechanism for discharging the steam to the outside of the packaging bag.

  In order to solve this problem, the patent document provides a fragile part in a part of the packaging bag, and the contents can be sealed as a packaging bag before heating by a microwave oven. As a result, the water vapor can be discharged from the fragile portion provided in a part of the packaging bag, and the rupture of the packaging bag can be prevented.

  However, in actual cooking, when heating and cooking are completed, the packaging bag is taken out of the microwave oven and cooled by the outside air, so that the once-expanded packaging bag contracts, and the fragile portion comes into contact with the contents. There is a problem that a part leaks outside.

  In addition, with the removal of the packaging bag or transfer to tableware, the leaked contents may be spilled or dropped onto the table or floor.

JP-A-2013-13441

  The present invention has been made in view of such a situation, and in cooking by heating in a microwave oven, water vapor can be discharged to the outside while preventing the packaging bag from being ruptured, and the contents are dropped onto a dining table or a floor. It is an object of the present invention to provide a packaging bag which can prevent the occurrence of the problem.

As means for solving the above problems, the invention according to claim 1 is a packaging bag capable of heating and cooking the contents by a microwave oven,
The packaging bag has a rectangular shape formed by heat-sealing the three or four sides of the periphery,
The packaging bag body has a fragile part that discharges water vapor by heating and cooking at the approximate center of the body,
A packaging bag characterized by having a gusset on the body of the packaging bag on the same surface as the fragile portion, and the gusset having a heat-sealed fin at a position below the fragile portion .

  The invention according to claim 2 is the packaging bag according to claim 1, wherein the packaging bag is formed of a laminate having at least a plastic film base layer and a sealant layer.

  The invention according to claim 3 is the packaging bag according to claim 1 or claim 2, wherein the fragile portion is formed by processing a scratch on the plastic film base layer of the laminate. .

  The invention according to a fourth aspect is the packaging bag according to the third aspect, wherein the flaw processing is performed by laser beam irradiation.

  The invention according to claim 5 is the packaging bag according to claim 3, wherein the flaw processing is performed by perforation using a blade.

  According to the present invention, in cooking by heating in a microwave oven, while preventing bursting of the packaging bag, water vapor can be discharged to the outside, and the content can be prevented from dripping on a table or a floor. It is possible to provide a bag.

  In particular, according to the invention as set forth in claim 2, in the cooking by heating in the microwave oven, it is possible to discharge the steam to the outside while preventing the packaging bag from being ruptured, and to drop the contents onto the table or the floor. It is possible to provide a packaging bag that can be prevented in a simpler and more reliable way.

  In particular, according to the invention as set forth in claim 3, it is possible to more surely prevent the packaging bag from being ruptured and more reliably discharge steam to the outside in the heating cooking by the microwave oven. It is possible to provide a packaging bag which can prevent dripping on the floor or the floor.

  In particular, according to the method described in claim 4, it is possible to more efficiently provide the fragile portion.

  In particular, according to the method described in claim 5, the fragile portion can be provided in a more reliable and simple manner.

FIG. 1 is a schematic perspective view illustrating one embodiment of a packaging bag according to the present invention. FIG. 2 is a schematic partial cross-sectional view for explaining a state of the packaging bag according to the present invention before heating in a state of cooking by a microwave oven. FIG. 3 is a schematic partial cross-sectional view illustrating a state in which the packaging bag according to the present invention is being heated during the cooking by a microwave oven. FIG. 4 is a schematic partial cross-sectional view for explaining a state of the packaging bag according to the present invention after heating in a state of heating and cooking by a microwave oven. FIG. 5 is a schematic perspective view for explaining the function of the fins after cooking of the packaging bag according to the present invention. FIG. 6 is a schematic partial cross-sectional view for explaining one embodiment of a layer structure of the laminate constituting the packaging bag according to the present invention. FIG. 7 is a schematic perspective view for explaining an embodiment of the packaging bag according to the present invention. FIG. 8 is a schematic plan view illustrating a comparative example of the packaging bag according to the present invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the present invention is not limited only to the examples shown here. The invention is limited by the claims.

  FIG. 1 is a schematic perspective view illustrating one embodiment of a packaging bag according to the present invention. The packaging bag (100) according to the present invention is a packaging bag capable of heating and cooking the contents by using a microwave oven, and the packaging bag (100) has a heat seal portion (3) and a heat seal portion at a peripheral edge of three or four sides. The bag is made rectangular by the part (8).

  In the example shown here, the heat seal portion (3) is heat-sealed and the contents are filled from the opening at the top of the packaging bag, and then the opening is sealed by the heat seal portion (8). .

  Alternatively, the body (20) of the packaging bag (100) is formed by folding back the lower side of the body, heat-sealing the two ends, leaving an opening at the top of the packaging bag, and filling the contents after filling. The opening may be sealed by heat sealing.

  The body (20) of the packaging bag (100) has a fragile part (1) for discharging water vapor during heating cooking by a microwave oven. The fragile portion (1) is a portion in which the packaging bag (100) swells due to the internal pressure of water vapor during the heating and cooking, and that portion is destroyed to connect the inside and the outside. Can be discharged.

  Further, a fin (10) formed by gusseting the body (20) of the packaging bag (100) on the same surface is provided below the fragile portion (1) and below the packaging bag (100). The fin (10) is formed by heat-sealing at least the heat-sealing portions (2) at both ends of the gusset, and in addition, the fold-back portion (9) of the gusset can also be heat-sealed.

  The packaging bag includes a laminate having at least a plastic film base layer and a sealant layer. By stacking the sealant layers of the laminate so as to face each other and heat-sealing, it is possible to make a bag with the two laminates or the folded laminate.

  FIG. 2 is a schematic partial cross-sectional view for explaining a state of the packaging bag according to the present invention before heating in a state of cooking by a microwave oven. The packaging bag (100) filled with the contents (4) is placed in a microwave oven with the fragile portion (1) upside down in a microwave oven for cooking by heating in a microwave oven. At this time, since the fin (10) of the trunk of the packaging bag (100) is also on the same surface as the fragile portion, the fin (10) faces upward.

  FIG. 3 is a schematic partial cross-sectional view illustrating a state in which the packaging bag according to the present invention is being heated during the cooking by a microwave oven. When the heating cooking by the microwave oven is started, the moisture contained in the contents (4) becomes steam (5) and fills the inside of the packaging bag, so that the volume of the packaging bag increases and the internal pressure increases.

  Subsequently, the fragile portion (1) is destroyed by the internal pressure, the inside and outside of the packaging bag (100) are connected, and the water vapor (5) inside is discharged to the outside of the packaging bag (100). At this time, the contents (4) are steamed by steam together with the heating. Such a cooking method is preferably used, for example, in Shumai or Chinese bun.

  FIG. 4 is a schematic partial cross-sectional view for explaining a state of the packaging bag according to the present invention after heating in a state of heating and cooking by a microwave oven. The packaging bag (100) filled with the contents is heated for a predetermined period of time, and when cooking is completed, steam is no longer emitted, and the volume of the packaging bag (100) gradually decreases, and the packaging bag (100) And the contents (4) come into contact with each other, and since the inside and outside of the fragile portion (1) are already in communication, a part of the contents (4) leaks to the liquid (6) and leaks out of the packaging bag (100). Sometimes.

  Conventionally, in this state, if the packaging bag (100) is taken out of the microwave oven and is to be put on the tableware, the liquid leak (6) will drop on the floor or adhere to the fingers or the table. Or may be done. In the present invention, since the fin (10) is provided in the body, it can play a role of receiving the liquid leak (6).

  FIG. 5 is a schematic perspective view for explaining the function of the fins after cooking of the packaging bag according to the present invention. In this figure, the packaging bag (100) for which heating and cooking have been completed is in a state where the packaging bag (100) is picked up by fingers with the upper part thereof up.

  Further, the contents are in a state of being accumulated on the lower side of the packaging bag, and are bulging toward the lower portion of the packaging bag (100). The fins (10) have the function of blocking the leakage (6) of the liquid leaking from the fragile portion (1) toward the lower part of the packaging bag (100) and blocking the fins (10) in this manner. When the fin (10) bulges toward the lower part of the packaging bag (100), the fin (10) also curves concavely upward and has a more preferable shape.

  In such a state, taking out the packaging bag (100) from the inside of the refrigerator and carrying it, or tearing out the upper part of the packaging bag (100) to take out the contents (4) is also affected by the liquid leakage (6). Easy without.

  Thus, according to the present invention, in cooking by heating in a microwave oven, it is possible to discharge steam to the outside while preventing the packaging bag from bursting, and to prevent the contents from dropping onto the dining table or floor. It is possible to provide a packaging bag.

  The packaging bag according to the present invention is composed of a laminate having a sealant layer using a plastic film as a base material. FIG. 6 illustrates one embodiment of the layer configuration of the laminate constituting the packaging bag according to the present invention. FIG.

In the embodiment shown here, a sealant layer (26) is arranged on the surface inside the packaging bag. Therefore, when a packaging bag is made using this sealant layer (26), the contents are filled and stored in the packaging bag in contact with the sealant layer (26).
Further, a gas barrier film (23) is provided on a surface outside the packaging bag, and the gas barrier film (23) is a plastic film (21) provided with a gas barrier layer (22) made of an inorganic compound.

  Further, in the example shown here, the plastic film base layer (25) is disposed in the middle of the laminate (30), which can affect the mechanical properties of the entire laminate (30). When a stretched polyamide film is used for this layer, for example, the laminate (30) can be provided with toughness against piercing and toughness against impact. The plastic film base layer (25) can be laminated via an adhesive layer (24).

  The layer configuration, the material configuration, the thickness, and the like of the laminate (30) can be appropriately designed according to the required quality for the packaging bag.

(Plastic film)
The plastic film of the plastic film base layer (25) constituting the laminate (30) is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate) , Polyethylene naphthalate, etc.), polyamides (nylon-6, nylon-66, etc.), polyimide and the like can be used, and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the plastic film base layer (25), the film strength and cost are more preferable.

(Sealant layer)
The sealant layer (26) is disposed on at least one surface of the laminate, and the two laminates are overlapped so that the sealant layers (26) face each other, and heated and pressed to be heat-sealed and adhered to each other. And make it possible to make a bag in the packaging bag (100).

  As a material of the sealant layer (26), a polyolefin resin among thermoplastic resins is generally used. Specifically, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a linear Ethylene resins such as high density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blended resin of polyethylene and polybutene, A polypropylene resin such as a homopolypropylene resin (PP), a propylene-ethylene random copolymer, a propylene-ethylene block copolymer, and a propylene-α-olefin copolymer can be used.

  In forming the sealant layer (26), a molten resin is formed into a film using an extruder or the like, and a layer can be formed on the laminate (30). Alternatively, it is also possible to form a sealant layer on the surface of the laminate (30) by laminating materials formed in a film state in advance by lamination.

(Print layer)
Although not shown in FIG. 6, if necessary, an image as a product or necessary information on the contents can be provided by printing on a layer in the laminate (30) that is visible from the outside of the packaging bag. . For this purpose, a plastic film made of a polymer material can be used as the base film.

  The polymer film is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), Polyimide or the like can be used, and is appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the base film, the film strength and cost are more preferable.

  Here, the printing method and printing ink are not particularly limited, but from the known printing methods, the suitability for printing on a film, design such as color tone, adhesion, safety as a food container, etc. It may be appropriately selected if it is taken into consideration. For example, a gravure printing method, an offset printing method, a gravure offset printing method, a flexographic printing method, an inkjet printing method, or the like can be used. Among them, the gravure printing method can be preferably used in terms of productivity and high definition of a picture.

(Gas barrier layer)
If necessary, an opaque layer such as a colored film that blocks ultraviolet rays can be provided in the laminate (30) for the purpose of improving the storage stability of the contents. Alternatively, a gas barrier layer (22) can be provided in the laminate (30). The example shown in FIG. 6 is an example using a gas barrier film (23) in which a gas barrier layer (22) is provided on the surface of a plastic film layer (21).

  The plastic film used for the gas barrier film (23) is a film made of a polymer resin composition, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide ( Nylon-6, Nylon-66, etc.), polyimide and the like can be used, and are appropriately selected according to the application. In particular, when polypropylene or polyethylene terephthalate is used as the plastic film base layer (25), the film strength and cost are more preferable.

  When heating by microwave oven is assumed, a metal foil such as an aluminum foil or an aluminum vapor-deposited layer cannot be used as a gas barrier layer. However, a gas barrier film (23) having a gas barrier layer (22) provided on the surface of a plastic film layer (21) can be used instead.

  In the case of the gas barrier film (23), the gas barrier layer (22) can be composed of a vapor-deposited layer and a coating layer of an inorganic compound. After a plastic film is provided with an anchor coat, a vapor-deposited layer and a coating layer are sequentially provided.

  For the anchor coat layer of the gas barrier film (23), for example, urethane acrylate can be used. In forming the anchor coat layer, a coating method in which a coating solution obtained by dissolving a resin in a solvent is applied by a printing method such as gravure coating is used, and a coating film can be formed by using a generally known coating method.

  As a method of forming a vapor deposition layer, an inorganic compound such as SiO or AlO is coated on a base film provided with an anchor coat layer by using a vacuum vapor deposition method, and an inorganic compound layer is formed by a vacuum vapor deposition method. it can. The thickness of the deposition layer is preferably 15 nm to 30 nm.

  As a method for forming the coating layer, an aqueous solution or water / alcohol containing at least one of a water-soluble polymer and (a) one or more alkoxides or hydrolysates thereof, or both, and (b) tin chloride is used. A coating agent containing a mixed aqueous solution as a main component is applied onto a film, and dried by heating to form an inorganic compound layer by a coating method, thereby forming a coating layer. At this time, by adding a silane monomer to the coating agent, the adhesion to the anchor coat layer can be improved.

  The inorganic compound layer has a gas barrier property even with a coating film formed by a vacuum deposition method alone, but a coating layer, which is an inorganic compound layer formed by a coating method, is formed on a vapor deposition layer that is an inorganic compound layer formed by a vacuum deposition method to form a gas barrier layer. be able to.

  By combining these two layers, a reaction layer of both layers is formed at the interface between the inorganic compound layer formed by the vacuum deposition method and the inorganic compound layer formed by the coating method, or the inorganic compound layer formed by the coating method becomes an inorganic compound layer formed by the vacuum deposition method. A dense structure is formed by filling and reinforcing the defects or micropores such as pinholes, cracks, and grain boundaries that occur, and achieves high gas barrier properties, moisture resistance, and water resistance, and is flexible enough to withstand deformation. Therefore, it can have suitability as a packaging bag.

When SiO is used as the gas barrier layer (22), the coating is transparent, so that the contents can be seen from the outside of the packaging bag. These may be properly used depending on the application and required quality.

  In addition, since no metal foil is used as the gas barrier layer, it is suitable for heating by a microwave oven and the like, and has an advantage in restoring the shape of a container when the packaging bag is used by being pushed from the outside.

(Adhesive layer)
When laminating each layer constituting the laminate (30), the layers can be laminated via the adhesive layer (24). As the material of the adhesive, for example, a polyester-isocyanate resin, a urethane resin, a polyether-based resin, or the like can be used.

  As a method of lamination, a method such as dry lamination or non-solvent lamination can be used. Alternatively, when a thermoplastic resin is used, a laminate or a layer can be formed using an extruder.

  Hereinafter, other characteristic elements constituting the present invention will be described in further detail.

(Fragile part)
The fragile portion (1) is shown in the schematic perspective view of FIG. 1, and is provided on one surface of the body (20) of the packaging bag (100). The fragile portion (1) is provided so that the fragile portion (1) is destroyed by the internal pressure of the packaging bag (100) due to water vapor before the entire packaging bag (100) ruptures. It can be formed by scratching the material layer.

  The fragile portion (1) is provided on one surface of the body (20) of the packaging bag (100), but is preferably provided substantially at the center of the body (20). This is because when the packaging bag (100) expands due to an increase in internal pressure due to cooking, the packaging bag (100) tends to expand upward and spherically, so that the center is easier to discharge water vapor. In addition, stress concentration on the packaging bag is likely to occur in the central portion, and the fragile portion (1) is likely to be a starting point of destruction.

(Scratch processing)
The flaw processing can be performed, for example, by laser beam irradiation, or can be performed by perforation using a blade.

(Gusset)
The gusset is formed by pinching and folding the laminated body of the body portion (20) to form the fins (10) of the packaging bag (100) shown in the schematic perspective view of FIG. (2) is formed by heat sealing.

  In addition to both ends, the folded portion (9) may be heat-sealed. The fin (10) thus formed is located below the fragile portion (1) and can receive and block liquid leakage from the fragile portion (1) due to heating and cooking.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited only to the examples shown here. The invention is limited by the claims.

<Example>
FIG. 7 is a schematic perspective view for explaining an embodiment of the packaging bag according to the present invention.
The embodiment shown here is a packaging bag with fragile parts (1) and fins (10) according to the invention.
The laminate constituting the packaging bag is a sealant layer having a thickness of 50 μm, and the plastic film base layer is a polyethylene terephthalate having a thickness of 12 μm. A fragile portion was formed in this plastic film substrate layer by flaw processing.
The size of the packaging bag is 140 mm top and bottom, 130 mm left and right.

<Comparative Example 1>
FIG. 8 is a schematic plan view illustrating a comparative example of the packaging bag according to the present invention.
The form of the comparative example shown here is a packaging bag with a fragile portion (1). However, no fin is provided.
The laminate constituting the packaging bag is a sealant layer having a thickness of 50 μm, and the plastic film base layer is a polyethylene terephthalate having a thickness of 12 μm.
A fragile portion was formed in this plastic film substrate layer by flaw processing as in the example.
The size of the packaging bag is 140 mm up and down and 130 mm left and right as in the example.

<Evaluation and verification>
Evaluation and verification were performed on the samples of the packaging bags prepared in Examples and Comparative Examples under the following conditions. (The number of samples is 20 each.)
Contents: 150g of water
Microwave oven heating condition: 1000 W for 2 minutes using AX-S1 manufactured by SHARP.

Procedure: (1) After heating in a microwave oven, remove the packaging bag from the refrigerator 30 seconds later.
(2) Leave for 1 minute in a suspended state with the top of the packaging bag facing up.
(3) Visually check the state of water dripping.

The criteria for evaluation and verification are as follows.
〇: No water dripping on the floor.
X: Water dripping on the floor is observed.

  Table 1 shows the results of evaluation and verification.

  According to the results shown in Table 1, in the packaging bag according to the present invention, no water dripping on the floor was observed in all 20 samples, whereas in the comparative example, 4 out of 20 samples were observed. Water dripping on the floor was observed in the individual.

  This is presumably because the fins of the packaging bag according to the present invention prevented water dripping. Thus, according to the present invention, in cooking by heating in a microwave oven, it is possible to discharge steam to the outside while preventing the packaging bag from bursting, and to prevent the contents from dropping onto the dining table or floor. It was verified that it was possible to provide a packaging bag.

DESCRIPTION OF SYMBOLS 1 ... Fragile part 2 ... Heat seal part 3 ... Heat seal part 4 ... Contents 5 ... Water vapor 6 ... Liquid leak 8 ... Opening heat seal 9 ... Return Part 10: Fin 20: Body 21: Plastic film layer 22: Gas barrier layer 23: Gas barrier film 24: Adhesive layer 25: Plastic film base layer 26 ...・ Sealant layer 30 ・ ・ ・ Laminate 100 ・ ・ ・ Packaging bag

Claims (5)

A packaging bag capable of heating and cooking the contents by a microwave oven,
The packaging bag has a rectangular shape formed by heat-sealing the three or four sides of the periphery,
The packaging bag body has a fragile part that discharges water vapor by heating and cooking at the approximate center of the body,
A packaging bag having a gusset on a packaging bag body on the same surface as the fragile portion, and the gusset having a heat-sealed fin at a position below the fragile portion .   The packaging bag according to claim 1, wherein the packaging bag comprises a laminate having at least a plastic film base layer and a sealant layer.   3. The packaging bag according to claim 1, wherein the fragile portion is formed by scratching a plastic film base layer of the laminate. 4.   The packaging bag according to claim 3, wherein the flaw processing is performed by laser light irradiation.   4. The packaging bag according to claim 3, wherein the flaw processing is performed by perforation processing using a blade. 5.