JP2004292021A - Easily openable packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily openable packaging bag in which no complicated operation or working is required, the reliability of sealability of the bag is not degraded, and the bag is easily torn and opened by tearing one surface of the bag by finger force while the other surface of the bag mostly remains in the bag. <P>SOLUTION: In the easily openable packaging bag, a film A overlaps a film B, and a peripheral part thereof is heat-sealed. The film A is a laminate film including at least a film of one-way straight cuttability and a thermal-bonding resin film layer. The film B is a laminate film including a film without one-way straight cuttability and a thermal-bonding resin layer. A pinching part of the width of ≥5 mm and ≤30 mm in the direction substantially orthogonal to a predetermined direction is provided in a peripheral part long in the direction substantially orthogonal to the predetermined direction, the pinching part is connected to the packaging bag at a part of the width smaller than the width of the pinching part, and the part is provided from the pinching part in the direction toward the other peripheral part longer in the direction orthogonal to the predetermined direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an easy-open packaging bag that can be easily opened by hand by tearing one side of the bag in one direction with a predetermined width.
[0002]
[Prior art]
Conventionally, a consumer who has purchased a product filled in a heat-sealed bag of a sealed laminated film, when opening the sealed bag, cuts the bag using a bag cutting tool such as scissors, a kitchen knife, a knife or the like. As a method of opening easily by hand without using these tools, a notch or the like is provided at the end of the bag, for example, at the heat-sealed end of the plastic bag, and the bag is torn and opened using the notch as a starting point. In general, a method or a method in which the heat seal portion of the bag is made easy to peel and the seal portion is peeled off and opened.
[0003]
As a typical example of the latter easily peelable packaging bag, a pillow-shaped packaging bag such as potato chips having a weak seal strength of the bag is well known. By pinching with a finger and pulling in opposite directions, the intersection of the upper or lower seal portion and the palm seal portion is peeled off, and the seal is peeled off to form an opening. However, this method has the disadvantage that the weak seal strength is not always uniform, and the degree of application of the force to pull the bag to both sides by hand varies from person to person. There is a concern that the seal may be damaged at the distribution stage because it is low. Further, when the content is a liquid content, there is a greater risk of breakage, and at the time of opening the bag, there is a problem that the bag is peeled off and opened, and the content jumps out.
[0004]
In the former case, for example, a three- or four-side sealed packaging bag or a pillow packaging bag having a notch provided at the end of the heat seal portion, the opening is formed by tearing the bag from the notch at the seal end of the bag. It is necessary to take out the contents from the opening.
[0005]
In that case, if the content to be taken out is easily broken, such as a bun, or is easily broken, such as a thin roasted rice cracker or a cookie, the content existing between the front and back films when tearing the film on the front and back of the bag. However, there is a drawback that a force is applied while being sandwiched between the two films, resulting in deformation or breakage. There is also disclosed an example in which a tear guide resin film is laminated to make the tear end linear (see Patent Document 1). However, a guide resin film is separately prepared, and the guide resin film is bagged during bag making. In this case, a facility for fusion is required, and the structure of the bag becomes complicated.
[0006]
Also, when tearing the bag from the same notch as above to open the bag in which the contents in the tray are sealed, the tearing piece of the opening is often caught on the tray and cannot be opened smoothly. In order to prevent this, a non-adhesive part is formed from the end of the side to be sealed to the seal part, and two notches are cut away from the end of the non-adhesive part into the part of the adhesive part. There has been proposed an easily-openable packaging bag which can be provided, and the space between the two notches can be picked up with a finger and only one side of the bag can be opened in a band shape at the interval width of the notches (see Patent Document 2). In this case, it is necessary to separate the front and back films at the notched seal portion at the time of opening, and the front and back films are peeled and separated by making the seal portion easily peelable. For that purpose, it is necessary to make the seal part of the entire bag easy peeling or only the seal part of the notch part easy peeling. However, if the whole seal is easy peeling, the seal at the distribution stage is required. There is a concern that the part may be damaged. Further, in order to make the peeling property necessary for the opening partially, it is necessary to perform the peeling treatment only on the part.
[0007]
In addition, as for the pillow packaging bag, a method has been proposed in which two notches are provided at intervals in the joint seal portion, and the bag is circumferentially opened by pinching and tearing the joint seal portion between the notches. (See Patent Document 3). However, also in this case, it is necessary to cut off the left and right films at the base of the joint seal portion, and for this purpose, by providing a fine scar at a portion corresponding to the base of the joint seal portion of the film on the opposite side to the film for which the unsealing proceeds, The film on the opposite side is cut off at that part and cut off. For this reason, there is a problem that a step of imparting a fine scar is separately required, and the strength of a portion where the scar is applied is reduced.
[0008]
In the opening method as described above, it is necessary to separate one film from the other film at the seal portion regardless of the shape of the bag. In other words, there is a difference between peeling a weakly adherent easily peelable seal and peeling the film easily and tearing the film, but in any case, the necessity of the peeling causes the above-mentioned problems. I was
[0009]
[Patent Document 1]
JP-A-2000-6993
[Patent Document 2]
JP-A-10-230971
[Patent Document 3]
JP 2001-55248 A
[0010]
[Problems to be solved by the invention]
No need for complicated operations and processing steps for easy opening, without weakening the sealing strength of the bag and the reliability of the sealing of the bag. An object of the present invention is to provide an easily-openable packaging bag which can be opened by reliably and easily tearing the other surface with a predetermined width in one direction while leaving almost the other surface.
[0011]
It is another object of the present invention to provide an easily-openable packaging bag having a reseal function of a bag, which is easy to find and open the opening of the bag after opening.
[0012]
[Means for Solving the Problems]
The present inventor has solved the above-mentioned problem, that is, the disadvantages of the prior art, and made the seal portion weakly peelable without impairing the reliability of the hermetic sealing of the bag, and also providing a scar to increase the strength of the bag. The present invention has been achieved as a result of intensive studies on the contradictory problem of easily satisfying the easy opening property without lowering the ease. That is, the present invention is any one of the following (1) to (5).
[0013]
(1) An easily-openable packaging bag in which a film A and a film B are overlapped and the peripheral portion is heat-sealed, wherein the film A is a film having a linear cut property in one direction and a heat-fusible resin film. The film B is a laminated film including a film having no linear cut property and a heat-fusible resin layer, and is disposed in a peripheral portion that is long in a direction substantially perpendicular to the one direction. A knob having a width in a direction substantially perpendicular to the one direction of 5 mm or more and 30 mm or less is provided, and the knob is connected to the packaging bag at a width smaller than the width of the knob, and The easy-open packaging bag, wherein the portion is provided in a direction from the knob portion to another peripheral portion which is long in a direction substantially perpendicular to the one direction.
[0014]
(2) The easy-open packaging bag is composed of a body side and a bottom, the body side is composed of a film A and a film B, and the bottom is folded inward in a gusset shape between the film A and the film B. The easy-open packaging bag according to the above (1), comprising the inserted film C, wherein a peripheral portion of each of the films is heat-sealed and formed into a ship bottom shape.
[0015]
(3) Furthermore, a zipper capable of resealing the easy-open packaging bag is provided in a direction substantially parallel to one direction, and the position of the zipper in a direction substantially perpendicular to the one direction is in the one direction of the packaging bag. The easy-open packaging bag according to the above (1) or (2), wherein, of the two sides in the substantially parallel direction, the knob is provided at a distance from the side closer to the knob.
[0016]
(4) The width of the heat seal portion provided with the knob portion in a direction substantially parallel to one direction is configured to be wider than the width of the other heat seal portions. An easily openable packaging bag according to any one of the above.
[0017]
(5) The laminated film in which the film A is composed of one or more layers of a polyolefin-based resin film, a polyamide-based resin film, or a polyester-based resin film having a linear cut property and a heat-fusible resin. The easy-open packaging bag according to any one of the above (1) to (4), wherein
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
An example of the packaging bag of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing an example of the packaging bag of the present invention. The packaging bag 1 is composed of a film A on the front side (in FIG. 1, the film A is located on the front side of the paper) and a film B on the back side (in FIG. 1, the film B is located on the back side of the paper). Are superimposed, and the periphery is heat-sealed to form a quadrangular shape.
[0019]
The curved notch 4 is a part of the tear-starting structure provided through the film A and the film B, and the vertical heat-sealing part 2-1 or 2-2 is arranged in the straight cut direction of the film A. It is long in a substantially right angle direction (vertical direction in FIG. 1), and is provided at the left end or the right end of the packaging bag. The films A and B are bonded by heat sealing. The horizontal heat seal portion 3-1 or 3-2 is long in the direction substantially parallel to the straight-line cut direction of the film A, and is provided at the upper end or the lower end of the packaging bag. I have.
[0020]
The film A has a straight-line cutting property in one direction, and is arranged such that the straight-line cutting direction is the direction of the double-headed arrow in FIG. Straight-line cutability literally means a property that is easily torn linearly in one direction, and specifically, a property defined by the following measurement method. That is, the film is cut into a square of 250 mm square along the flow direction and the direction perpendicular to the flow direction during the production of the laminated film. As shown in FIG. 2, two notches are formed at the edges of the cut piece perpendicular to the direction in which the straight cut property is tested, at intervals of 30 mm. The film is torn in a direction parallel to the straight-line cutting direction by gripping a 30 mm cut with a finger (the film is cut as indicated by a dotted line in FIG. 2).
[0021]
Generally, depending on the orientation direction of the molecules and the orientation direction of the components blended with the resin, the degree of cutting of the film may vary depending on the tearing direction of the film, so the above tear test is applied to the left and right directions of the film. The linear cutting property is determined based on the width of the leading end “X” of the film in which the leading end of the tear becomes thinner. In any direction, a film having a value of X less than 5 mm or a tear that does not reach the opposing edge is referred to as a film having no linear cut property.
[0022]
FIG. 3 is a schematic cross-sectional view of the film A on the front side and the film B on the back side of the packaging bag 1. The film A on the front side having a linear cut property is composed of a base film layer 5-1 and a film layer 6 having a linear cut property. And a laminated film of the heat-fusible resin film layer 7-1. Depending on the required characteristics of the bag, the order of lamination of the base film layer 5-1 and the film layer 6 having linear cut properties may be reversed, or the base film layer 5-1 may not be provided. Although not shown, other intermediate film layers may be separately laminated.
[0023]
Further, in FIG. 3, a film having a linear cut property is used as a part of the layer structure to impart a linear cut property to the film A. Other methods are described in, for example, JP-A-9-156649. Two films having different molecular orientations are laminated back-to-back, that is, a film layer of a combination in which two films form a set and exhibit a linear cut property is part of a layer structure. The film A may be used to impart a linear cut property.
[0024]
The other film B constituting the back side of the bag is a film having no linear cut property, and is a laminated film of the base film layer 5-2, the intermediate film layer 8, and the heat-fusible resin film layer 7-2. Consists of However, the intermediate film layer 8 may not be provided, and although not shown, another intermediate film layer may be laminated.
[0025]
For the base film layers 5-1 and 5-2, polyolefin resin films such as polypropylene, polyamide resin films such as nylon 6, nylon 66, and nylon 12, polyester resin films such as polyethylene terephthalate and polybutylene terephthalate, etc. And the like are preferably used.
[0026]
Examples of the film having a linear cut property include a uniaxially stretched polyethylene film, a uniaxially stretched uniaxially stretched polyolefin resin film such as a uniaxially stretched polypropylene film, and a nylon 6 resin as described in, for example, JP-A-7-113015. A biaxially stretched polyamide resin film prepared by mixing a polymeta-xylylene adipamide resin and devising a layer separation structure and stretching conditions, or a polyethylene terephthalate resin as described in JP-A-11-300916, for example, There is a biaxially stretched polyester resin film in which a terephthalate resin is mixed and the layer separation structure and stretching conditions are devised.
[0027]
Examples of the heat-fusible resin film layers 7-1 and 7-2 include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, and a copolymer resin of a vinyl compound copolymerizable with ethylene. Polyethylene-based resin film or polypropylene-based resin film. It is preferable that the types of resin of the heat-fusible resin film layers 7-1 and 7-2 are the same.
[0028]
When the bag needs gas barrier properties such as water vapor and oxygen, and aroma barrier properties for storing the filled contents, a polyvinylidene chloride resin layer or ethylene vinyl resin should be used for the base film layers 5-1 and 5-2. Select a film coated with a resin layer mainly composed of an alcohol resin, a film on which a metal oxide, a metal or the like is deposited, or a film having a gas barrier property as the intermediate film layer 8, for example, a metal foil such as aluminum, polyvinylidene chloride, or the like. Films such as resin films, ethylene vinyl alcohol resin films, and coextruded films of these with other resins can be laminated. Further, when rigidity, design, etc. are required for the film, paper can be laminated. In the film A and the film B, the heat-fusible resin film layers 7-1 and 7-2 are opposed to each other, and the peripheral portions 2-1 and 2-2 are heat-sealed according to a standard method to form the packaging bag 1.
[0029]
The method for producing the films A and B is not particularly limited, and a dry or wet lamination method in which the films are laminated with an adhesive, a sand lamination method in which the films are laminated with a molten polyethylene or the like extruded from a T die, An extrusion lamination method of laminating by extruding molten polyethylene or the like from a T die, a thermal lamination method using a low melting point heat-fusible resin, and the like are used according to the purpose.
[0030]
In the heat seal portion 2-1 which is long in the direction perpendicular to the straight line cut direction indicated by the double-headed arrow direction in FIG. 1, a cut 4 is provided through the heat-sealed films A and B. An enlarged view of the cut 4 is shown in FIG. The notch 4 is pulled out with the pull-out notch 4-1 separating the knob 4-3 for picking and pulling out from the packaging bag with a finger from the packaging bag, and withdrawing the knob 4-3. And a band notch 4-2 constituting a band 4-4 for tearing. These 4-1 to 4-4 constitute a structure for starting cutting.
[0031]
The knob 4-3 has a width in the straight-line cutting direction of 5 mm or more and 30 mm or less, and has a size that can be easily picked out with a finger. The knob cutout 4-1 has two end points, and has a line segment shape formed by a combination of curves or straight lines.
[0032]
The band 4-4 is continuous with the knob 4-3. One end of the band 4-4 in the straight cutting direction is connected to the knob 4-3, and the other end is connected to the main body of the packaging bag. The other end is provided at a position closer to the knob 4-3 in the direction of the space for filling the contents of the packaging bag. Further, the band portion 4-4 is configured to have a smaller width in the straight-line cutting direction than the knob portion 4-3 and a length capable of maintaining the straight-line cutting property over the entire length of the packaging bag in the straight-line cutting direction. The band notch 4-2 is formed of two line segment-shaped cuts that are connected to each of the two end points of the knob cut 4-1 and are provided in a direction substantially parallel to the straight line cutting direction. These two cuts serve as notches for initiating cuts in the straight cut direction, and have a relatively short length that remains in the heat seal to seal the contents.
[0033]
As an example of a specific shape of the cut 4 of the structure for starting the tearing, as shown in FIG. 4, the knob cut 4-1 has a curved shape ((a) to (d)) such as a circle or an ellipse. A polygonal shape such as a square ((e), (f)) or a triangle ((g), (h)) is possible, and a band 4-4 having a smaller width following the notch 4-1. May be two straight lines parallel to the straight-line cutting direction or a tapered shape in which the tip on the opposite side of the knob 4-3 is tapered.
[0034]
The length of the band notch 4-2 in the straight-line cutting direction is not particularly limited, and usually may be about 0.5 mm or more. If it is too long, it will reach the space where the filler is to be filled, and the meaning of sealing will be lost, so the length must not reach the space. Depending on the shape of the knob 4-3, the band notch 4-2 may not be provided. That is, the band portion 4-4 may not be provided.
[0035]
With the notch 4 having such a shape, the position of the knob 4-3 is easy to recognize, and the knob 4-4 is caused to be pinched by a finger to easily tear using the linear cut property of the film A. When tearing (rightward as viewed in FIG. 1), it is easy to pinch and slip. Therefore, even when a person having weak picking power such as a child, an elderly person, or a sick person, or when the knob 4-3 or finger is wet with oil or water and is slippery, the band is cut through the knob 4-3 without fail. Since the tearing force can be concentrated on 4-2, the opening can be reliably and neatly opened. In order to make the knob portion 4-3 easier to grip and less slippery, this portion may be subjected to a process for preventing slippage such as embossing.
[0036]
FIG. 5 is a partially enlarged view of a portion where a structure for starting the tearing of the packaging bag 1 is provided. The notch 4 has a structure for starting tearing having the notch notch 4-1 and the band notch 4-2 having a smaller width following the notch notch as described above. The heat seal portion 2-1 is provided in the vertically long heat seal portion 2-1 in a direction in which the heat seal portion 2-1 is easily torn along the straight line cut direction. The maximum width "W1" of the knob cutout 4-1 in FIG. 5 is 5 mm or more and 30 mm or less, and preferably 10 mm or more and 20 mm or less. When it is 5 mm or more, it is easy to pick. When it is 30 mm or less, when the knob 4-3 is picked and the bag is opened, depending on the position where the knob 4-3 is picked, a force is obliquely applied to the cut 4-2. Thus, the phenomenon that the force is not effectively transmitted to the band notch 4-2 and the unsealing does not proceed smoothly does not easily occur.
[0037]
The width "W2" of the band notch 4-2 in FIG. 5 is preferably about 70 to 15% of the width W1 of the knob 4-3, and this width W2 corresponds to the tearing start width when opening. Specifically, it is determined by the band-like opening width required for the bag. The distance “Y” between the end of the band cut 4-2 and the inner heat seal end of the bag is preferably about 1 to 10 mm, and if it is 10 mm or less, a large force is not required due to tearing at the start of opening, and the heat seal width is reduced. Also fall within a reasonable range. Further, when Y is 1 mm or more, unintended tearing between the Y distances during bag production and distribution makes it difficult to cause bag breakage.
[0038]
In order to prevent unintended widening of the seal width of the vertical seal 2-1 provided with the cuts 4 and to prevent unintended bag breaking, for example, 9-1 illustrated in FIG. 6A or 6B. Alternatively, as in 9-2, it is preferable that the width of the vertical seal portion 2-1 in the vicinity of the cut 4 in the straight-line cutting direction is partially made to protrude inside the bag more than the width of the other heat seal portions. In FIG. 6, the shapes of the protruding portions 9-1 and 9-2 are shown in a curved shape, but may be a combination shape of straight lines or a combination shape of a curve and a straight line, and are not particularly limited. With such a projecting structure, the size of the knob 4-3 and the distance "Y" between the tip of the band cut 4-2 and the inner heat seal end of the bag are not affected by the seal width of the bag. Can be controlled.
[0039]
FIG. 7 is a diagram showing an example of a packaging bag 10 having a reseal function by further providing a zipper 11 in the packaging bag of FIG. The zipper 11 is arranged substantially in parallel with the direction in which the film A is cut straight. The zipper 11 includes a male member and a female member, and is formed by extruding a polyolefin resin such as polyethylene, polypropylene, or a copolymer thereof, which can be heat-fused to the film A and the film B, for example. Are continuously formed by the above-mentioned means, and are inserted and fused between the heat-fusible resin film layers of the film A and the film B at the time of bag making.
[0040]
FIG. 8 shows an example in which the zippered wrapping bag of FIG. 7 is replaced with a zippered tundling packaging bag 12 having a standing function. Here, the standing packaging bag is a general term for a self-contained packaging bag, also called a standing pouch, and is a three-piece film consisting of a film A on the front side and a film B on the back side serving as the side surface of the bag and a film C serving as the bottom of the bag. Consists of In addition, the self-sustainability refers to a property in which when the bag is placed on a horizontal surface with the bag standing with the bottom part down, the bag remains intact without any support and does not easily fall down.
[0041]
The standing packaging bag has a film C serving as a bottom surface of the bag formed by disposing the heat-fusible resin film layers of the film A and the film B to face each other, and further folding the bag between the lower ends of the films A and B in an inverted V-shape. Are inserted and arranged, and heat-sealing is performed on both sides and a lower end, which are peripheral portions of surfaces in contact with the respective fills. The bottom surface is formed in a form having a gusset portion formed by folding and inserting the film C inward, and a bottom film notch portion such as a semicircle is provided near the lower end on both sides of the folded bottom film C, and The gusset part is formed by forming a bottom heat seal part 13 with a ship bottom type seal pattern.
[0042]
The standing wrapping bag is filled with the contents from the upper opening, so that the bottom gusset portion is expanded in a tubular shape together with the trunk portion, and at the bottom portion, the lower edge of the gusset portion is formed by the bottom seal portion 13 of the ship bottom shape. At the same time, the laminated film on the wall surface is heat-sealed at the side of the bottom film cutout on both sides thereof, so that a ring-shaped leg is formed on the outer periphery of the bottom by the heat-sealed portion. A portion is formed, thereby imparting independence to the bag. The standing packaging bag 12 is heat-sealed after filling the contents from the opening at the upper end to form the upper sealed portion 3-1.
[0043]
1, 7 and 8 show an example in which the cut 4 is provided in the vertical seal portion 2-1 on the left side of the bag, but may be provided in the vertical seal portion 2-2 on the right side. Two locations may be provided on the left and right vertical seals at the same time. Also, a total of two or more vertical seal portions on the left and right may be provided. In the packaging bag 10 with a zipper in FIG. 7 or the standing packaging bag 12 with a zipper in FIG. 8, an example in which the cut 3 is provided in the vertical seal portion 2-1 between the upper horizontal seal portion 3-1 and the zipper portion 11 is shown. In addition to this, one or more cuts 4 are formed in the zipper portion 11 and the lower seal portion 3-2 or in the vertical seal portion 2-1 or 2-2 between the zipper portion 11 and the bottom heat seal portion 13. It may be provided. The notch 5 is provided by a bag making machine when the bag is made.
[0044]
FIG. 9 shows a state in which the packaging bag 1 of FIG. 1 is being opened, and the opening is performed with the front side film A facing upward and the knob 4-3 is lifted up with a finger, and the arrow of the front side film A of the bag is opened. , Ie, in the direction perpendicular to the long direction of the vertical seal portion 2-1 provided with the cut 4 (the direction of the straight cut arrow in FIG. 9). Since the front side film A is laminated with the film 8 having the linear cut property, the front side film A is torn in the linear cut direction by the linear tear line 14 having substantially the same width as the width W2 of the band cut 4-2.
[0045]
On the other hand, since the film B on the back side of the bag does not have a straight-line cut property or has a small straight-line cut property, a tear force in the linear direction is given by being affected by the tear force in the linear direction of the front-side film A having the straight-cut property. At a point slightly inside the sealing edge on the inside of the bag, the tapered shape like the tear line 15 is torn and torn, a part is cut off, and separated from the film B together with the opening piece 16. As a result, almost only the front side film A of the bag can be cut out as the opening piece 16. In this way, the packaging bag 1 that can be easily opened has a seal portion that is easily peelable and does not need to be easily torn when sealing the film on the back side. A can be opened by tearing only A at a predetermined width. In addition, the tearing by the unsealing piece 16 reaches the vertical seal part 2-2 on the opposite side along the straight cut direction from the vertical seal part 2-1 which has started the unsealing, and stops. For this reason, the opening piece 16 does not remain as it is attached to the bag 1 and is scattered as dust.
[0046]
FIG. 10 is a sectional view of the vicinity of the zipper and the unsealing portion where the zippered packaging bag 10 of FIG. 7 is opened. In the packaging bag of FIG. 10, the straight-cut film A is located on the front side (front side) of the bag as viewed in the drawing, and the film B having no straight cut property or having a small straight cut property is disposed on the back side of the bag. . The space 18 is a portion where the film A has been removed by opening. To take out the contents from this bag, insert a finger into the space portion 18 from which the opening piece 16 of the film A has been removed, and easily put a finger on the cut end of the film A to open the film A and the film B left and right, The bag can be opened by releasing the engagement of the zipper 11.
[0047]
Further, in the packaging bag shown in FIGS. 1, 7 and 8, the front film A except for the back film B and the cut-off opening piece 16 remains in the shape of the bag even after opening, so that the upper seal 2-2. Is used as a header, a header is provided on the upper seal 2-2, a hole is formed in the portion, and the portion is hung. In the case of a bag in which the portion is printed, the function is lost even after the bag is opened. There is an advantage that it can be held without any problem.
[0048]
Furthermore, after opening, the opening piece 16 has no front side film A and only the back side film B. Therefore, the bending rigidity of the bag in this portion is low, and the bag is along the tear line 14 above the tear line 14. When the opening zipper 11 is not installed on the bag, the vicinity of the upper seal 2-2 of the folded bag is stuck to the film A on the front surface of the body of the bag with an adhesive tape or the like. By attaching, the contents can be prevented from spilling out of the bag and the bag can be easily resealed.
[0049]
In addition, these packaging bags may be printed with characters or figures for consumers to recognize the opening start portion of the bag, or may be printed with explanatory diagrams or text to understand the tearing method. Is also good.
[0050]
These packaging bags are easy to break like Japanese confectionery, western confectionery, cake, thin baked rice crackers, cookies, wafers, sticks, etc. It is particularly suitable for packaging of flat contents, such as, and for packaging of contents with a tray.
[0051]
These easy-opening packaging bags do not require complicated operation processing steps for easy opening, only providing a notch knob as a starting point of opening in a strong seal portion. The seal strength of the bag and the reliability of the sealability of the bag are easily reduced, and one side of the heat seal bag is easily left by hand, and the other surface is easily torn in one direction with a predetermined width without deteriorating. This is an easily-opening packaging bag which solves the above-mentioned drawbacks of the prior art which makes it easy to find and open the opening and to ensure independence. Hereinafter, the present invention will be described more specifically with reference to examples.
[0052]
Embodiment 1
As the laminated film A, an embedding PC of a 12 μm-thick longitudinal linear cut polyethylene terephthalate film manufactured by Unitika Ltd. and an aluminum foil having a thickness of 7 μm were put through a polyurethane anchor coating agent at a density of 0.920 g / cm ³ Then, a low-density polyethylene having a thickness of 15 μm was extruded and bonded by a sand lamination method, and then the low-density polyethylene having a thickness of 40 μm was extruded and laminated on the aluminum foil side.
[0053]
A laminated film was obtained in the same manner as film A, except that a normal polyethylene terephthalate film having a thickness of 12 μm and having no linear cut property was used instead of the linear cut polyethylene terephthalate film.
[0054]
With a bag making machine, the low-density polyethylene film surfaces of the film A and the film B faced each other, and were continuously fed from a biaxial feeding machine, and the film A and the film B were overlapped. As shown in FIG. 12, by partially heat sealing, a long heat seal portion 3-1 is provided along the film flow direction, and heat seal portions 2-1 and 2 long in the direction perpendicular to the film flow direction are provided. -2. This was cut as appropriate, and three sides were heat-sealed, and one side parallel to the film flow direction became an opening 19. Each seal width was 10 mm, and the length in the film flow direction (transverse direction of the bag) was 10 mm. A so-called horizontal bag-making bag having a length of 150 mm and a length perpendicular to the flow (vertical direction of the bag) of 220 mm was obtained.
[0055]
At this time, the protruding heat seal portion 20 was provided near the intersection of the heat seal portion 3-1 and the heat seal portion 2-1 so as to protrude from the heat seal portion 3-1 inward of the bag. The size of the protruding heat seal portion 20 was set such that the protruding length in the film flow direction was 7 mm and the protruding length in the direction perpendicular to the film flow was 12 mm. The protruding heat seal portion 20 was provided with a keyhole-shaped cut 4 shown in FIG. The specific dimensions of the cuts 4 were W1 = 10 mm, W2 = 5 mm, and Y = 3 mm using W1, W2, and Y defined in FIG. Further, the symmetric axis of the cut 4 was provided so as to be at a distance of 17 mm from the outer end of the bag on the heat seal portion 3-1 side.
[0056]
After inserting four brittle confections having a width of 20 mm, a length of 160 mm, and a thickness of 10 mm into the bag from the opened portion 19 of the bag side by side, the opened end is heat-sealed to form a four-side sealed bag. I prepared them.
[0057]
The key-shaped notch 4 can be raised with a finger and easily picked with a finger, and the film B is pulled 7 mm from the seal edge inside the bag by pulling and pulling in the straight-line cut direction of the film A in the figure. As shown in 9-15, the tip is tapered off, separated from the opening piece 15 and cut smoothly, and then only about 5 mm width of the film A is stabilized across the bag without breaking the contents. It was cut open and the contents could be taken out. Further, the cutting of the film A was stopped at the heat seal portion 2-2 facing the heat seal portion 2-1, and the unsealed pieces remained in the bag without being separated from the bag and were not scattered. An opening operation similar to the above was attempted with the fingertip wet with water, but the opening was possible without the finger with the cut not slipping much.
[0058]
[Comparative Example 1]
A bag similar to that of Example 1 was obtained, except that the cuts were W1 = 4 mm, W2 = 3 mm, and Y = 3 mm. These small cuts 4 are hard to be raised by the finger, and it is necessary to put force on the finger to firmly pick it with the fingertip. An opening operation was attempted with the fingertips wet with water, but in this case, the finger slipped and it was difficult to pinch the notch, and it was very difficult to open.
[0059]
Embodiment 2
The film A and the film B of Example 1 are continuously fed from the twin-screw feeding machine in the same manner as in Example 1, and the zipper band is fed separately from this, so that the zipper band moves in the flow direction of the bag making machine. The zipper is parallel and the center line of the zipper is disposed so as to be 28 mm from the outer end of the bag of the heat seal portion 3-1. Except that three sides were heat-sealed, the sealing width was 10 mm, the length in the film flow direction (the lateral direction of the bag) was 150 mm, and the length in the direction perpendicular to the flow (the vertical direction of the bag) was the same as in Example 1 except that the three sides were heat-sealed. Was 220 mm, and a notch 4 was obtained between the seal 3-1 and the zipper to obtain a bag for horizontal bag making.
[0060]
A bag of 15 mm-diameter spherical candy which was individually wrapped as a to-be-packaged product was packed in a bag almost completely except for a seal margin, and the opening was sealed with a seal width of 10 mm.
[0061]
When the keyhole-shaped knob was raised and picked up with a finger, the film A was pulled open in the direction of linear cutting, and the film B was opened 7 mm from the seal edge inside the bag, as in Example 1. As in 9-15, the tip was tapered and cut off the opening piece, and then only about 5 mm width of the film A could be stably cut open across the bag. By sticking a fingertip into the space of the film A after being cut off as an opening piece, the film A and the film B on the front and back of the bag were easily separated, the zipper was opened and the bag was opened and the contents could be taken out without any trouble. . When the zipper was opened again after the zipper was resealed, the zipper could be easily opened by the above operation.
[0062]
[Comparative Example 2]
Except that the film A of Example 1 was used on the back side of the bag, that is, a bag similar to that of Example 1 was obtained by using the film A having a straight-cut property as the front and back films of the bag. As well. In this bag, since the film on the back side also had a linear cut property, the back side film A could not be separated from the opened piece, was blocked by the contents, stopped tearing, and could not be opened.
[0063]
[Comparative Example 3]
Except that the film B of Example 1 was also used on the front side of the bag, that is, the same bag as that of Example 1 was obtained by using the film B having neither the front and back films nor the linear cut property. The contents were similarly packed. In this bag, the front film B was cut off together with the back film B in the direction of opening and the direction of the force applied when the notch was picked with a finger and pulled. In this case, there was not much difference from the conventional notched bag, and the opening was stopped at a place where it was unstable and hit the contents, or the contents were destroyed, and the unstable, stable and smooth opening could not be performed.
[0064]
【The invention's effect】
It requires only relatively simple modifications to facilitate opening and does not require complicated operations or processing steps. There is no need to lower the sealing strength of the bag or to make scars, and the reliability of sealing performance is not reduced. Moreover, it can be easily opened with a small force of a finger. After opening, almost one side of the packaging bag remains in the bag, so that an advertisement can be placed here, and simple resealing can be performed using an adhesive tape or the like.
[Brief description of the drawings]
FIG. 1 is a front plan view of an easy-open packaging bag.
FIG. 2 is a diagram illustrating a method for measuring a linear cut property.
FIG. 3 is a cross-sectional view showing a laminated structure of a film A and a film B.
FIG. 4 is a diagram showing an example of a tear initiation structure.
FIG. 5 is an enlarged view of the vicinity of a structure for starting tearing of the packaging bag of FIG. 1;
FIG. 6 is a diagram of another example of a tear initiation structure.
FIG. 7 is a front plan view of a packaging bag with a zipper.
FIG. 8 is a front side plan view of a standing packaging bag with a zipper.
9 is a conceptual diagram of the packaging bag of FIG. 1 in the process of being opened.
FIG. 10 is a cross-sectional view of the vicinity of an opening piece after opening the packaging bag with a zipper.
FIG. 11 is a conceptual diagram of a packaging bag being manufactured.
[Explanation of symbols]
A Film A (laminated film with straight-cutting properties)
B Film B (Laminated film without straight cut property)
C Film C (Bottom film of gusset bag)
1 Easy-open packaging bag
2-1、2-2 Vertical heat seal part
3-1、3-2 Horizontal heat seal part
4 Notch
4-1 Notch cut
4-2 Notch
4-3 knob
4-4 Obi
5-1、5-2 Base film
6 Straight cut film
7-1, 7-2 Heat-fusible film
8 Intermediate film
9-1, 9-2 Protruding heat seal part
10 Easy-open packaging bag with zipper
11 Zipper
12 Standing easy-open packaging bag with zipper
13 Bottom seal
14 Tearing line
15 Tearing line of film B
16 Opening pieces
18 Space of film A after removing the opening piece
19 Opening
20 Projection heat seal part

Claims (5)

A film A and a film B are overlapped and the peripheral portion is heat-sealed and is an easily-openable packaging bag, wherein the film A comprises a film having a linear cut property in one direction and a heat-fusible resin film layer. The film B is a laminated film including a film having no linear cut property and a heat-fusible resin layer, and the film B is disposed in a peripheral portion that is long in a direction substantially perpendicular to the one direction. A knob having a width in a direction substantially perpendicular to the direction of 5 mm or more and 30 mm or less is provided, and the knob is connected to the packaging bag at a portion having a width smaller than the width of the knob, and Is provided in a direction from the knob portion to another peripheral portion which is substantially perpendicular to the one direction and extends toward the other peripheral portion. The easy-open packaging bag was composed of a body side and a bottom, the body side was composed of a film A and a film B, and the bottom was inserted between the film A and the film B by being folded inward in a gusset shape. The easy-open packaging bag according to claim 1, comprising a film C, wherein a peripheral portion of each of the films is heat-sealed and formed into a ship bottom shape. Furthermore, a zipper that can reseal the easily-openable packaging bag is provided in a direction substantially parallel to one direction, and the zipper has a position substantially perpendicular to the one direction in a direction substantially parallel to the one direction of the packaging bag. The easy-open packaging bag according to claim 1 or 2, wherein the knob is provided apart from the knob from a side closer to the knob. The width of the heat seal portion provided with the knob portion in a direction substantially parallel to one direction is configured to be wider than the width of the other heat seal portion. Easy-open packaging bag. Film A is a laminated film composed of a heat-fusible resin and one or more layers of a polyolefin-based resin film, a polyamide-based resin film, or a polyester-based resin film having a linear cut property. The easy-open packaging bag according to any one of claims 1 to 4, characterized in that:

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