JP2008044624A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost packaging bag that excels in pin-hole resistance and the ability to be torn open, the packaging bag being used for individually packaging confectionery, foodstuff, or suchlike transported in packed in a container such as a paper box. <P>SOLUTION: The pillow type packaging bag is formed from laminates including a base material layer and a heat-bondable resin layer for the inner layer, and is formed by sealing perimetral heat-bondable parts A' and B'. In a specific area including end edges S' formed from the creases of the packaging bag, and inner edge side intersections P' of the perimetral heat-bondable parts perpendicular to the end edges, a weak bondable part R is provided between the base material layer and inner layer. The weak bondable part R is composed of a releasing-agent coated part and uncoated part. A pattern is formed so that the coated part serves as a sea and the uncoated part serves as an island. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging bag that can prevent the occurrence of pinholes, and more specifically, when a plurality of individually wrapped packaging bags are directly stored in a container such as a paper box and transported, vibration and impact during transportation, etc. It is related with the packaging bag which can prevent that a pinhole arises in the corner | angular part of a packaging bag by rubbing with the inner surface of containers, such as a paper box.

  Conventionally, contents such as highly hygroscopic confectionery and food, or easily oxidized confectionery and food, are individually packaged in a packaging bag excellent in oxygen gas barrier property and water vapor gas barrier property to prevent deterioration in texture and flavor. Packaged and individually packaged contents are sold in containers such as paper boxes, and the texture and flavor of the contents such as confectionery and food that are individually packaged until they are eaten are maintained and safe. A sense of quality and luxury.

  However, since the individual packaging bags are transported in the state of being packaged in a container such as a paper box, a pinhole is generated in the individual packaging bag by rubbing against the inner surface of the container due to vibration or impact during transportation. There is a risk that the texture and flavor of things will be impaired. As a method for solving this, there is a method of increasing the total thickness of the laminate constituting the individual packaging bag to such an extent that no pinhole is generated in the individual packaging bag even if it is rubbed with the inner surface of the container due to vibration or impact during transportation. There is a method of using a cushioning material between the individual packaging bag and the inner surface of the container so as not to rub against the inner surface of the container, or a method in which a reinforcing film is affixed to a portion of the packaging bag where pinholes are generated (for example, see Patent Document 1 ).

  However, these methods have a problem in that the cost increases because the thickness of the laminate is increased or a member such as a cushioning material or a reinforcing film is used. In order to solve this problem, the portion of the packaging bag that rubs against the inner surface of a container such as a paper box has a structure in which the portion between the base material layer and the inner layer is an unbonded portion or a weakly bonded portion. However, since the base material layer and the inner layer at this site are peeled off, the base material layer is given a degree of freedom, and only the base material layer can move freely, and the rubbing position can be changed and laminated. A technique is disclosed in which the apparent hardness of the body can be softened and the occurrence of pinholes can be prevented (see, for example, Patent Document 2).

With the technique disclosed in Patent Document 2, the pinhole resistance is improved and an inexpensive packaging bag is provided. However, although the unbonded or weakly bonded portion is provided in the packaging bag, the pinhole resistance is improved. However, when the consumer opens the packaging bag, the packaging bag starts to tear from the opening. When the adhesive layer or the weakly bonded portion is reached, the base material layer and the inner layer are torn, and there is a problem that the inner layer is stretched and it is difficult to open the packaging bag.
Japanese Utility Model Publication No. 7-17738 JP 2005-145533 A

  Therefore, the present invention is a packaging bag that is excellent in pinhole resistance and is excellent in tearing and unsealing properties, in which contents such as confectionery and food are packaged individually in a form packed in a container such as a paper box. Is provided at low cost.

  In order to achieve the above object, the present invention according to claim 1 is a three-sided seal comprising a laminate comprising a base material layer and a heat-adhesive resin layer on the inner layer and hermetically sealed by a peripheral heat-bonding portion. In a type or pillow type packaging bag, between the base material layer and the inner layer in a predetermined area including an end edge formed of a folded portion of the packaging bag and an intersection point on the inner edge side of the peripheral thermal bonding portion orthogonal to the end edge A weakly bonded portion is provided, and the weakly bonded portion is composed of a release agent-applied portion and a non-coated portion, and the relationship between the coated portion and the non-coated portion is the sea-island shape with the coated portion being the sea and the non-coated portion being the island. It is a packaging bag characterized by being pattern-formed.

  Moreover, this invention of Claim 2 consists of a laminated body which provided the base material layer and the thermoadhesive resin layer in the inner layer, and was sealed by the peripheral heat-bonding part which has a gusset folding part in a both-sides edge part. In the packaging bag, when the top part and the bottom part are formed in a rectangular shape to make the packaging bag self-supporting and the top and bottom surfaces are formed, the base material layer in a predetermined region including the corners of the top and bottom surfaces A weakly bonded portion is provided between the inner layer and the inner layer, and the weakly bonded portion is composed of a release agent-coated portion and a non-coated portion, and the relationship between the coated portion and the non-coated portion is the non-coated portion. It is a packaging bag characterized by being formed in a pattern so as to form a sea island with islands.

  Moreover, the present invention according to claim 3 is the packaging bag according to claim 1 or 2, wherein the non-application portion is a rectangle having a side length of 0.5 mm to 1.0 mm and having a constant interval. It is formed, and the area ratio of the application part and the non-application part is 4: 1 to 1: 1.

  Moreover, the present invention according to claim 4 is the packaging bag according to claim 3, wherein one side of the rectangle forming the non-application portion intersects at an angle other than 90 degrees with respect to the opening direction of the packaging bag. It is characterized by this.

  In the packaging bag of the present invention, even if this part is rubbed by providing a weak adhesive part consisting of a release agent coating part and a non-coating part between a base material layer and an inner layer of a part that rubs against the inner surface of a container such as a paper box. Since the base material layer and the inner layer are peeled at the part where the release agent is applied at this site, the base material layer is given a degree of freedom and only the base material layer can move freely, and the rubbing position can be changed. In addition, it is possible to soften the apparent hardness of the laminate and to produce an excellent effect of preventing the occurrence of pinholes.

  In the packaging bag of the present invention, the weakly bonded portion is composed of a release agent coating portion and a non-coating portion, and the relationship between the coating portion and the non-coating portion is a sea-island shape with the coating portion being the sea and the non-coating portion being the island. The base layer and the inner layer are not bonded or weakly bonded in the coated part, but the base layer and the inner layer are strongly bonded in the non-coated part, and the packaging bag is torn. In the coating part, the tearability is inferior, but in the non-application part, the tearing characteristic is excellent. By configuring in this way, when opening the packaging bag, when starting to tear the packaging bag from the opening, tearing in the application part is inferior, but tearing is excellent in the non-application part, along the opening direction, Since an application part and a non-application part exist alternately, there exists an effect that a packaging bag can be opened easily.

  Further, the invention of claim 3 is to further achieve both the effect of preventing the occurrence of pinholes in the packaging bag and the effect of improving the tearing openability by limiting the range of the application part and the non-application part.

  Further, the invention of claim 4 is more reliable on the opening line when the side of the rectangle forming the non-applied portion intersects at an angle other than 90 degrees with respect to the opening direction of the packaging bag to tear and open the packaging bag. There is a non-applied portion in the case, which is torn through the non-applied portion at the time of opening, which has an effect of facilitating the tearing and opening of the packaging bag.

The above-described present invention will be described in detail below with reference to the drawings.
FIG. 1 is a developed view for explaining a first embodiment of a packaging bag according to the present invention, FIG. 2 is a layer configuration diagram schematically showing an embodiment of a laminate constituting the packaging bag of FIG. 1, and FIG. FIG. 4 is a partially enlarged view of a weakly bonded portion (area indicated by Δ in FIG. 1), FIG. 4 is a perspective view illustrating a second embodiment of the packaging bag according to the present invention, and FIG. 4 is a development view of the packaging bag, FIG. 6 is a partially cutaway perspective view showing an embodiment of the packaging bag packed in a paper box, and FIG. 7 shows an embodiment of the packaging bag filled with contents. FIG. 8 is a development view of the packaging bag shown in FIG. 7, in which 1 and 10 are packaging bags, 2 is a laminate, 3 is a weakly bonded portion, 4 is an application portion, and 5 is not applied. Part, 21 is a base material layer, 22 is an inner layer, A is an upper and lower heat bonding part, B is a palm heat bonding part, G is a gusset folding part, K is a paper box, P is a pinhole occurrence point, S is an end made of a folding part Part a length of one side of the rectangle of the uncoated portion, b is the length of the other sides, c is shown a opening angles.

  First, problems of the conventional packaging bag will be described. FIG. 6 is a partially cutaway perspective view showing an embodiment in which the packaging bag is packed in a paper box. The paper box K is a sealed end carton, and the packaging bag 1 in which the contents are individually packaged in the paper box K. Are stored in tandem. Then, a predetermined number of the paper boxes K in which the packaging bags 1 are packaged are packed in a cardboard box and transported from the manufacturer to a distribution relay station or a store such as a supermarket or a convenience store.

  As shown in FIG. 7, a packaging bag 1 packaged in a paper box K is a pillow-type packaging bag sealed with an edge thermal bonding portion consisting of a palm thermal bonding portion B and an upper and lower thermal bonding portion A, for example, Although not shown, flat rectangular biscuits are packaged. And as shown in FIG. 7, the intersection S (4 places) of the edge part S which consists of the folding part of the both ends of the said packaging bag 1, and the inner edge side of the up-and-down heat-bonding part A orthogonal to this edge part S is a corner | angular part. Is forming.

  When the packaging bag 1 as described above is transported in the paper boxes K stored in tandem as shown in FIG. 6, the intersection P of the packaging bag 1 is rubbed against the inner surface of the paper box due to vibration or impact during transportation. A pinhole is generated in P, and oxygen or moisture enters from the pinhole, which may impair the texture and flavor of the contents, for example, biscuits.

  The development view of the packaging bag 1 shown in FIG. 7 is as shown in FIG. 8, and the portion indicated by the broken line S ′ is the end portion S formed of the folded portion of the packaging bag 1, and is indicated by the oblique lines. The locations indicated by the reference sign B ′ are locations where the heat-bonding part of the packaging bag 1 is formed, and the locations indicated by the upper and lower reference signs A ′, which are also indicated by diagonal lines, are the locations where the upper and lower heat-bonding parts A of the packaging bag 1 are provided. And the place (4 places) shown with the black dot which attached | subjected code | symbol P 'is a place used as the said intersection P where the pinhole of the packaging bag 1 generate | occur | produces.

  FIG. 1 is a development view for explaining a first embodiment of a packaging bag according to the present invention, and FIG. 2 is a layer configuration diagram schematically showing an embodiment of a laminate constituting the packaging bag of FIG. As shown in FIG. 2, the bag 1 is composed of a laminate 2 having a base material layer 21 and an inner layer 22 made of a heat-adhesive resin layer, and is indicated by a symbol P ′ as shown in FIG. The base layer 21 and the inner layer 22 of the laminate 2 in a region R (region indicated by Δ) having a substantially equilateral triangle or a substantially isosceles triangle whose base is parallel to the edge of the upper and lower thermal bonding portion A ′. Between the two, a weakly bonded portion composed of a release agent application portion and a non-application portion is provided. The region R is a substantially equilateral triangle or isosceles triangle having a base of 15 to 25 mm and a height of 15 to 25 mm, and a vertex facing the base parallel to the edge of the upper and lower thermal bonding portion A ′ is on the broken line indicated by S ′. And the length between the apex and the symbol P ′ is 0 to 3 mm. From the laminate 2 configured as described above, the pillow type packaging bag shown in FIG. 7 in which the contents, for example, biscuits are individually packaged, is wrapped in a paper box in a tandem shape and transported, and vibration and impact during transportation are carried out. Even when the intersection P (see FIG. 7) and the area including the intersection P of the packaging bag 1 are rubbed against the inner surface of the paper box K due to the above, the packaging bag 1 is provided in the area R (see FIG. 1) including the intersection P (see FIG. 7). Since the base material layer 21 and the inner layer 22 are peeled at the release agent application part constituting the weak adhesive part, a degree of freedom is given to the base material layer, and only the base material layer can move freely and rub. The position can be changed and the apparent hardness of the intersection point P of the laminate 2 can be softened, and the occurrence of pinholes can be prevented. In addition, although the area | region R was illustrated with the triangle, it is not limited to this, A circle, an ellipse, a polygon, etc. can be suitable.

  Next, the weakly bonded portion 3 will be described in detail with reference to FIG. The weak adhesion part 3 is provided in the area | region R (refer FIG. 1) containing the intersection P (refer FIG. 7), and consists of the application part 4 and the non-application part 5 which apply | coated the release agent, and the application part 4 and the non-application part 5 The pattern is formed so as to form a sea-island relationship in which the application part 4 is the sea and the non-application part 5 is an island. The non-application part 5 is rectangular and has a certain interval. The length a of one side of the rectangle is preferably 0.5 mm to 1.0 mm, and more preferably a square. The interval between the non-application portions 5 is patterned so that the area ratio between the application portion 4 and the non-application portion 5 is 4: 1 to 1: 1. Moreover, it is preferable that the space | interval of the non-application part 5 is equal intervals with the other non-application part 5 adjacent. With this configuration, when the coating unit 4 rubs against the inner surface of the paper box K, the coating layer 1 peels off between the base material layer 21 and the inner layer 22 to prevent the occurrence of pinholes in the packaging bag 1. Since the material layer 21 and the inner layer 22 are united without being separated due to strong adhesion, when the packaging bag 1 is opened, if the packaging bag starts to tear from the opening, the tearing is poor at the application portion 4. The non-application part 5 is easily torn, and the application part 4 and the non-application part 5 are alternately present in the opening direction, and can be opened while maintaining the tearability of the packaging bag 1. The effect of preventing the occurrence of pinholes and the effect of improving tear-opening properties are both achieved.

  Moreover, it is preferable that the opening angle c formed by the opening direction of the packaging bag 1 and one side of the rectangle forming the non-application portion 5 intersect at an angle other than 90 degrees. By doing so, when the packaging bag 1 is torn and opened, the non-applied portion is more surely present on the opening line, and is torn through the non-applied portion at the time of opening, thereby facilitating the tear-opening of the packaging bag. effective. The weakly bonded portion 3 is usually formed by forming a printed layer on the back surface (the surface on the inner layer 22 side) of the base material layer 21, and aligning the printing register with the surface on the inner layer 22 side of the printed layer. It is only necessary to print the release agent application part and the non-application part in the region indicated by the symbol R shown in FIG. 1 to form a pattern, compared with the method of increasing the total thickness of the laminate constituting the packaging bag. And very inexpensive. As the release agent for forming the release agent application part, for example, polyamide resin is mainly mixed with nitrified cotton or cyclized rubber, or silicone, fluorine resin, or a mixture thereof is used as ink. be able to. Further, the adhesive strength (peeling strength) between the base material layer 21 and the inner layer 22 in the coating portion 4 forming the weakly bonded portion 3 is 0 to 0.7 N / 15 mm width. When the adhesive strength exceeds 0.7 N / 15 mm width, even if the intersection P (see FIG. 7) of the packaging bag 1 rubs against the inner surface of the paper box K due to vibration or impact during transportation, the intersection P (see FIG. 7). It does not peel between the base material layer 21 and the inner layer 22, and pinholes cannot be prevented.

  4 is a perspective view for explaining a second embodiment of the packaging bag according to the present invention, FIG. 5 is a development view of the packaging bag of FIG. 4, and the packaging bag 10 has gusset folding portions G (FIG. 4) at both side ends. This is a pillow gusset type packaging bag that has a gusset folding part on the top and is sealed with an edge thermal adhesive part consisting of a palm thermal adhesive part B and an upper and lower thermal adhesive part A, not shown However, for example, contents such as cookies, snacks and tea are packaged. The pillow gusset type packaging bag having the gusset folds G on both side ends can increase the capacity of the contents because of the gusset folds, and can be displayed in the store in a stand-alone state. It is a packaging form and is widely adopted. However, as in the first embodiment, a plurality of boxes are packed in paper boxes or cardboards in tandem and transported from the manufacturer to a distribution relay station or a store such as a supermarket or a convenience store. As a result, the corners of the gusset folding part G (shown in FIG. 4, only the part indicated by symbol P-6) are rubbed against the inner surface of the paper box or cardboard box, which may cause pinholes. The portion indicated by P is located on the ridge line of the gusset folding part G, which is located on the line indicated by the broken line G1 in FIG. 5, and the upper and lower signs A ′ indicated by the oblique lines in FIG. Is the place where the upper and lower thermal bonding portions A become, but the reference symbol P on the side of the reference A ′ that becomes the opposite upper and lower thermal bonding portions A from the inner edge of the reference symbol A ′ by the approximate folding width of the gusset folding portion G. 8 positions of black spots indicated by '. In addition, the broken line shown with the code | symbol G2 on FIG.

  Similarly to the first embodiment described above, this second embodiment is composed of the laminate 2 including the base material layer 21 and the inner layer 22 made of the heat-adhesive resin layer, and the reference symbol P ′ in FIG. Application in which a release agent is applied between the base material layer 21 and the inner layer 22 of the laminate 2 in a region R (region indicated by a circle) having a radius of 1.0 to 3.0 mm centered on the location indicated by. A pillow adhesive set packaging bag as shown in FIG. 4 is formed, which is composed of a weakly bonded portion 3 composed of a portion 4 and a non-applying portion 5 and individually wraps the contents. Even if the intersection P (see FIG. 4) of the packaging bag 10 rubs against the inner surface of the paper box K due to vibration or impact during transportation, the occurrence of pinholes is prevented by the same function as described in the first embodiment. can do.

  Next, the laminated body 2 used for the packaging bags 1 and 10 of this invention is demonstrated. As the base material layer 21 of the laminated body 2, since it becomes a basic material constituting the packaging bags 1 and 10, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like can be used. For example, a film made of polyester, polyamide, polypropylene, or the like, or a film in which a polyvinylidene chloride layer is provided on these films, or a film in which an inorganic vapor deposition layer such as aluminum or silicon oxide is provided Can be used. Moreover, as these films, the film extended | stretched to the uniaxial direction thru | or biaxial direction is suitable. This is because usually the substrate layer 21 is often printed and printability is required. Further, the thickness of the film constituting the base material layer 21 may be a thickness that can be kept to the minimum necessary for strength, rigidity, etc. as a basic material, and can be determined in consideration of cost and the like. Although it is good, it is about 12-25 micrometers in general.

  Further, the inner layer 22 of the laminate 2 may be a layer formed from a heat-adhesive resin that can be melted by heat and welded to each other, and is appropriately selected depending on the physical properties required for the packaging bags 1 and 10. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, It can be formed with an ethylene-vinyl acetate copolymer, an ionomer resin, an acid copolymer of ethylene and acrylic acid, an ester copolymer of ethylene and acrylic acid ester, or the like.

  Moreover, the laminated body 2 may provide an outer layer as needed on the surface side of the base material layer 21. As the outer layer, for example, a film made of a resin such as polyester, polyamide or polypropylene, or a film provided with a polyvinylidene chloride layer on these films, or an inorganic substance such as silicon oxide A layer provided with a vapor deposition layer, ethylene vinyl alcohol copolymer, or the like can be used. In addition, as a method of laminating each layer, a known laminating method such as a sandwich lamination method or a dry lamination method may be used as appropriate.

  Next, the present invention will be described in more detail with reference to the following examples.

  Photoelectric tube marks are printed with urethane ink at a pitch of 105 mm (vertical pitch in FIG. 1) on the corona discharge treated surface of a 20 μm-thick biaxially oriented polypropylene film, and ink made of polyamide resin and nitrified cotton is peeled off. 1 including the position (4 locations) indicated by P ′ in FIG. 1 as an agent, and having a base of 25 mm and a height of 20 mm, is a substantially isosceles triangle, and is a base parallel to the edges of the upper and lower thermal bonding portions A ′ A pattern formed in the region R in which the length between the vertex and the symbol P ′ is 3 mm is formed by the release agent application part and the non-application part <b> A weakly bonded part consisting of a thin adhesive layer (see Table 1) is printed and then a 20 μm thick unstretched polypropylene film (laminated surface is a corona discharge treated surface) is laminated on the weakly bonded part surface via a urethane adhesive. Product of the present invention A layered body was produced. In addition, the formation pattern of the weakly bonded portion is the size of the non-applied portion (the length a of one side of the rectangle, the length b of the other side), the opening angle formed by the tear opening direction of the packaging bag and the side of the non-applied portion It was shown in Table 1 by the area ratio of c and an application part and a non-application part.

  A laminate was produced in the same manner as in Example 1 except that only the formation pattern of the weakly bonded portion was the pattern <b> (see Table 1).

  A laminate was produced in the same manner as in Example 1 except that only the formation pattern of the weakly bonded portion was <C> (see Table 1).

  A laminate was produced in the same manner as in Example 1 except that only the formation pattern of the weakly bonded portion was a pattern <d> (see Table 1).

[Comparative Example 1]
A laminate was produced in the same manner as in Example 1 except that only the formation pattern of the weakly bonded portion was <e> (see Table 1).

[Comparative Example 2]
A laminate was produced in the same manner as in Example 1 except that only the weakly bonded portion formation pattern was a pattern <f> (see Table 1).

[Comparative Example 3]
A laminate was produced in the same manner as in Example 1 except that only the weakly bonded portion formation pattern was <pattern> (see Table 1).

[Comparative Example 4]
A laminate was produced in the same manner as in Example 1 except that only the weakly bonded portion formation pattern was a pattern <h> (see Table 1).

[Comparative Example 5]
A laminate was produced in the same manner as in Example 1 except that the weakly bonded portion was not provided.

  Using the pillow packaging machine, the outer dimensions in which the laminated bodies of Examples 1 to 4 and Comparative Examples 1 to 5 produced above were packaged in two biscuits (width 48 mm x height 60 mm x thickness 8 mm) were obtained. Each of the pillow type packaging bags shown in FIG. 7 having a width of 65 mm × 105 mm (the seal width of the peripheral heat-bonding portion is 7 mm) is prepared, and a paper box (inner dimensions: horizontal 92 mm × vertical 155 mm × height 63 mm) is shown in FIG. As shown, 8 bags were each packaged in tandem. Each of the paper boxes was stacked in five stages and shrink-wrapped to form a stack, and further, the stack was stacked in a cardboard box in 2 × 3 rows (total of 6 stacks) with the stacking direction as the vertical direction. Each one of these cardboard boxes is transported by 500 km by mixed flight, and then the paper box 3 cases are taken out from the cardboard boxes and evaluated for tearing and opening, and the remaining 27 cases are evaluated for pinhole resistance by the number of occurrences of pinholes. The results are shown in Table 1.

The tear openability was evaluated by sensory evaluation of whether or not the packaging bag could be easily opened by passing the weakly bonded portion 3 by using the vicinity of the end portion formed of the folded portion as the opening and passing through the weakly bonded portion 3.
Also, the presence or absence of pinholes is determined by cutting the body center of the packaging bag, taking out the biscuits, and then pouring a 10% alcohol solution of methylene blue into the packaging bag with a syringe, and then starting from the location indicated by symbol P in FIG. Checked for leaks.

  As is clear from Table 1, all of the pillow packaging bags of Examples 1 to 4 exhibited good tear openability and pinhole resistance. In Example 3, the tear openability was slightly inferior to that of the other examples, but it was not at a level that would cause a practical problem. This is because the angle between the tear opening direction and the other side of the non-applied part that forms the weakly bonded part is 90 degrees. This is considered to occur when In Comparative Example 1, the pinhole resistance was good, but the tear-opening property was inferior to the Examples. Comparative Example 2 and Comparative Example 5 had good tear-opening properties, but their pinhole resistance was inferior to those of the Examples. Comparative examples 3 and 4 were inferior to the examples in pinhole resistance.

It is an expanded view explaining 1st embodiment of the packaging bag concerning this invention. It is a layer block diagram which shows schematically one Example of the laminated body which comprises the packaging bag of FIG. It is the elements on larger scale of the weak adhesion part provided in the packaging bag of FIG. It is a perspective view explaining 2nd embodiment of the packaging bag concerning this invention. It is an expanded view of the packaging bag of FIG. It is a partially notched perspective view which shows one Example of the state which packed the packaging bag in the paper box. It is a perspective view which shows one Example of the state of the packaging bag with which the content was filled. It is an expanded view of the packaging bag shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 Packaging bag 2 Laminated body 3, R Weakly bonding part 4 Application | coating part 5 Non-application | coating part 21 Base material layer 22 Inner layer A Vertical heat bonding part B Joint heat bonding part G Gusset folding part K Paper box P Pinhole generation | occurrence | production place S End composed of a part a Length of one side of rectangle b Length of other side c Opening angle

Claims (4)

In a three-side seal type or pillow type packaging bag comprising a laminate having a base material layer and a heat adhesive resin layer on the inner layer and sealed by a peripheral heat bonding portion, an edge composed of a folded portion of the packaging bag and the edge A weak adhesive portion is provided between the base material layer and the inner layer in a predetermined region including an intersection on the inner edge side of the peripheral thermal adhesive portion orthogonal to the edge, and the weak adhesive portion is formed from the release agent application portion and the non-application portion. The packaging bag is characterized in that the relationship between the application part and the non-application part is formed into a sea-island shape with the application part as the sea and the non-application part as an island. In a pillow gusset type packaging bag comprising a laminate having a base material layer and a heat-adhesive resin layer on the inner layer and sealed with a peripheral heat-bonding portion having gusset folding portions on both side ends thereof, to make the packaging bag self-supporting When the top and bottom are molded into a rectangular shape to form the top and bottom surfaces, a weakly bonded portion is formed between the base material layer and the inner layer in a predetermined region including corners of the top and bottom surfaces. The weakly bonded portion is formed of a release agent-applied portion and a non-applied portion, and the relationship between the applied portion and the non-applied portion is a sea island with the applied portion as the sea and the non-applied portion as an island. A packaging bag formed by being formed. The non-applied part is formed in a rectangular shape having a side length of 0.5 mm to 1.0 mm and having a constant interval, and the area ratio of the applied part to the non-applied part is 4: 1 to 1: 1. The packaging bag according to claim 1 or 2, wherein The packaging bag according to claim 3, wherein one side of the rectangle forming the non-application portion intersects at an angle other than 90 degrees with respect to the opening direction of the packaging bag.

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