JP2005162275A - Pillow-type packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pillow-type packaging bag equipped with a novel unsealing means which can be easily unsealed and obtain a neat unsealed opening. <P>SOLUTION: The pillow-type packaging bag comprises a base material layer including a back heat-sealed region 2 heat-sealed in a butted manner and folds 4 at both side rims having both end rims in the direction orthogonal to the region 2 via end rim heat-sealed regions 3 and 3' in parallel to the region 2, an inner layer made of heat-sealable resin, and a laminate 10 equipped at least with an undrawn resin layer peelably stuck adjacently to the surface of the inner layer on the side of the base material layer. A first cut line passing through the inner layer is formed in the vicinity of the inner rim of at least one of the end rim heat-sealed regions 3 and 3' along the inner rim from the internal surface side of the laminate 10 forming the surface opposite to the surface with the region 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a pillow-type packaging bag having a laminate strength and heat seal strength that have V-shaped folds and W-shaped folds on both sides for containing solid, powder, granule, etc., and is difficult to open. More particularly, the present invention relates to a pillow-type packaging bag having a novel opening means, which can be easily opened and has a beautiful opening.

  Conventionally, as a packaging bag for storing solid, powdered, granular, etc. contents, laminate strength and heat seal strength with V-shaped folds and W-shaped folds (gusset folds) on both sides are strong. Pillow type packaging bags are widely used. For example, pillow-type packaging bags that have gusset folds (hereinafter referred to as gusset packaging bags) are sold at storefronts because they contain a large amount of contents per unit packaging material, or in an independent state. It is often used for contents such as regular coffee, cocoa, and milk powder because of its excellent appeal effect. And, such a gusset packaging bag is picked up by the fingers on the upper surface and the back surface (the surface where the back portion heat-bonded portion thermally bonded in a palm shape) and pulled away from each other. Since it is difficult to open the package, the outer edge of the upper thermal bonding part is usually provided with an I-shaped or V-shaped notch (notch), and the packaging bag is opened with this notch as the opening start end. It is configured.

  However, when the packaging bag is opened from the notch provided at the outer edge of the upper thermal bonding portion, the packaging bag is opened in the vertical direction and the gusset folding portion is present, so that the opening is formed in an extremely distorted shape. In addition to the poor appearance and smooth removal of the contents, if you want to take out a part and save the rest, temporarily seal it with a resealing tool such as a rubber band or tack label. Although it is preserved, since the opening is distorted, the provisional sealing itself is quite troublesome.

Techniques for solving the above-described problems in gusset packaging bags are disclosed (for example, see Patent Document 1 and Patent Document 2). The technique disclosed in Patent Document 1 is to form an opening by tearing a laminated body constituting a packaging bag in a lateral direction using a tear film, and a beautiful opening is obtained and a part thereof is obtained. In the case of taking out and storing the rest, the tear film can be easily sealed and stored with a resealer, but the tear film is expensive and the cost of the packaging bag is increased accordingly. Moreover, the technique disclosed in Patent Document 2 forms zipper-shaped cut lines from the upper edge to the lower edge on both front and back surfaces of the packaging bag, thereby forming an opening in the packaging bag in the vertical direction. Yes, as with Patent Document 1, a beautiful opening can be obtained. On the other hand, since the opening is formed in the vertical direction, it cannot be said that it is an appropriate packaging bag when a part is taken out and the rest is stored. It is. In addition, since both of Patent Documents 1 and 2 are opened, the opened piece is separated from the packaging bag body, so that there is a problem that it cannot be disposed of as a whole.
Japanese Utility Model Publication No. 3-8145 JP-A-8-217094

  Therefore, the present invention is to provide a pillow-type packaging bag provided with a novel opening means that can be easily opened and obtain a beautiful opening. Another object of the present invention is to provide a pillow-type packaging bag that can be easily sealed with a resealer even when a part of the contents is taken out and the rest is stored, and that no opening piece is generated at the time of opening. .

  In order to achieve the above-mentioned object, the inventor of the present invention described in claim 1 includes a back portion heat-bonded portion thermally bonded in the shape of a palm, and both end edges in a direction perpendicular to the back-portion heat-bonded portion. Adjacent to the base layer side surface of the base layer, the inner layer made of a heat-adhesive resin, having a folded portion on both side edges parallel to the back thermal bond portion sealed by the adhesive portion An unstretched resin layer is provided at least, and the adhesive strength between the inner layer and the unstretched resin layer is a pillow type packaging bag made of a laminate configured to be peelable, and A first score line penetrating the inner layer from the inner surface side of the laminate constituting the surface facing the surface having the back thermal bonding portion is formed along the inner edge in the vicinity of at least one inner edge. It is characterized by. By configuring in this way, the surface having the back thermal bonding portion on at least one edge thermal bonding portion side and the surface opposite to the surface having the back thermal bonding portion are picked with fingers and pulled in a direction away from each other. Thus, the one edge thermal bonding portion can be easily opened, and a beautiful opening can be formed.

  Further, the present invention according to claim 2 is the pillow type packaging bag according to claim 1, wherein at least one of the edge thermal bonding portions has a central portion of the inner edge protruding to the other side of the edge thermal bonding portion. It is characterized by being.

  Moreover, this invention of Claim 3 is a pillow type packaging bag in any one of Claim 1, 2, The said folding part is a gusset folding part, It is characterized by the above-mentioned.

  According to a fourth aspect of the present invention, there is provided the pillow-type packaging bag according to the third aspect, wherein the back portion is formed along the inner edge in the vicinity of at least one inner edge of the edge thermal bonding portion located in the gusset folding portion. A second cut line penetrating the inner layer is formed from the inner surface side of the laminate constituting the surface having the thermal bonding portion, and is opposed to the surface having the back thermal bonding portion and the surface having the back thermal bonding portion. The back portion from each of the first cut line and the second cut line at a position corresponding to a valley fold portion of the gusset fold portion of at least one of the edge thermal bonding portions of the laminated body constituting the surface to be cut One or more third cutting lines extending to at least one outer edge of the edge thermal bonding portion in parallel with the thermal bonding portion are provided through the inner layer from the inner surface side. is there. By comprising in this way, a gusset folding part can be expanded completely and the big opening opening which is easy to take out the contents can be obtained.

  Further, the present invention according to claim 5 is parallel to the back heat-bonded portion thermally bonded in a palm shape and the back heat-bonded portion in which both ends in the direction orthogonal to the back heat-bonded portion are sealed with edge heat-bonded portions. The inner layer is provided with at least a base layer having a folded portion at both side edges, an inner layer made of a heat-adhesive resin, and an unstretched resin layer adjacent to the base layer side surface of the inner layer. Is a pillow-type packaging bag made of a laminate configured to be peelable, and one of the edge thermal bonding portions leaves an unbonded portion on the edge. The inner layer is provided from the inner surface side of the laminate that is provided and forms a surface facing the surface having the back thermal bonding portion along the outer edge and the inner edge in the vicinity of the outer edge and the inner edge of the one edge thermal bonding portion. A fourth cut line is formed to penetrate therethrough. . By configuring in this way, the surface of the unbonded portion having the back thermal bonding portion and the surface facing the surface having the back thermal bonding portion are grasped with fingers and pulled in a direction away from each other. The edge thermal bonding part can be easily opened, and a beautiful opening can be formed.

  Further, the present invention according to claim 6 is the pillow type packaging bag according to claim 5, wherein the one edge thermal bonding portion protrudes toward the edge side where the central portion has an unbonded portion. It is what.

  Moreover, this invention of Claim 7 is a pillow type packaging bag in any one of Claim 5, 6, The said folding part is a gusset folding part, It is characterized by the above-mentioned.

  Further, the present invention according to claim 8 is the pillow type packaging bag according to claim 7, wherein the one edge thermal bonding portion located in the gusset folding portion is adjacent to the outer edge and the inner edge along the outer edge and the inner edge. A fifth score line penetrating the inner layer is formed from the inner surface side of the laminate constituting the surface having the back thermal bonding portion, and has a surface having the back thermal bonding portion and the back thermal bonding portion. Between the fourth cut line and the fifth cut line at a position corresponding to a valley fold portion of the gusset fold portion of the one edge thermal bonding portion of the laminated body constituting the surface facing the surface. One or a plurality of sixth cut lines parallel to the back thermal bonding portions to be connected to each other are provided through the inner layer from the inner surface side. By comprising in this way, a gusset folding part can be expanded completely and the big opening opening which is easy to take out the contents can be obtained.

  Moreover, this invention of Claim 9 is a packaging bag in any one of Claims 1-8, The said inner layer and the said unstretched resin layer are comprised by different resin, It is characterized by the above-mentioned. is there.

  In the packaging bag according to any one of claims 1 to 9, the adhesive strength between the inner layer and the unstretched resin layer is 0.2 to 5.0 N / 15 mm width. It is characterized by being.

  The pillow type packaging bag of the present invention does not generate an opening piece at the time of opening, can be opened easily, and a beautiful opening can be obtained, and a part of the contents is taken out and the rest is preserved In this case, an excellent effect can be obtained that it can be easily sealed with a resealer.

The present invention will be described in detail below with reference to the drawings.
1 is a front view schematically showing a first embodiment of a pillow type packaging bag according to the present invention, FIG. 2 is an enlarged sectional view taken along line XX of FIG. 1, and FIG. 3 is a pillow type packaging bag according to the present invention. FIG. 4 schematically shows a third embodiment of the pillow-type packaging bag according to the present invention, (a) is a perspective view of relevant parts from the front side, b) is a main part perspective view from the back side, (c) is a main part development view seen from the inner layer side, FIG. 5 is a front view schematically showing a fourth embodiment of a pillow type packaging bag according to the present invention, 6 is an enlarged cross-sectional view taken along line YY of FIG. 5, FIG. 7 is a diagram schematically illustrating the opening method and opening state of the pillow type packaging bag of FIG. 5, and FIG. 8 is a pillow type packaging bag according to the present invention. (A) is a principal part perspective view from the front side, (b) is a principal part perspective view from the back side, ) Is an exploded view of the main part viewed from the inner layer side, FIG. 9 is a perspective view of the main part showing the unsealed state, and 1,1 ′, 1 ″, 1 ′ ″, 1 ″ ″ in the figure are pillow type packaging bags 2 is a thermal bonding part at the back, 3, 3 ', 3 "are thermal bonding parts at the edges, 4, 4' are folding parts, 10 is a laminate, 11 is a base material layer, 12 is an inner layer, and 13 is an unstretched resin. Layers 30 are protrusions, 50, 51, 52, 53, 53 ′, 54, 54 ′, and 55 are score lines, respectively.

  1 is a front view schematically showing a first embodiment of a pillow type packaging bag according to the present invention, FIG. 2 is an enlarged sectional view taken along line XX of FIG. 1, and the pillow type packaging bag 1 is a base material. A layer 11, an inner layer 12 made of a heat-adhesive resin, and an unstretched resin layer 13 adjacent to the surface of the inner layer 12 on the substrate layer 11 side, and the unstretched resin layer 13 and the inner layer 12. Formed of a rectangular laminated body 10 configured such that the adhesive strength between the two can be peeled off, and a pair of opposing edges of the laminated body 10 are thermally bonded in a palm shape to form the back thermal bonding portion 2; Pillow type packaging having V-shaped folds 4 on both side edges parallel to the back thermal bonding part 2 in which both end edges in a direction orthogonal to the back thermal bonding part 2 are sealed with edge thermal bonding parts 3 and 3 '. It is a bag, and the edge thermal bonding part 3 has a central part of its inner edge protruding toward the edge thermal bonding part 3 '. The inner layer 12 from the inner surface side of the laminate 10 that has a protrusion 30 and forms a surface facing the surface having the back thermal bonding portion 2 along the inner edge in the vicinity of the inner edge of the edge thermal bonding portion 3. A first score line 50 (actually the tip of the first score line 50 is located in the unstretched resin layer 13) is formed.

  FIG. 3 is a perspective view schematically showing a main part of a pillow type packaging bag according to a second embodiment of the present invention. The pillow type packaging bag 1 ′ is the V-shaped folded portion of the packaging bag 1 shown in FIG. 4 is a pillow-shaped packaging bag having a gusset folding portion 4 ′ that is the same as the packaging bag 1 except that W is a W-shaped folding portion (gusset folding portion) 4 ′.

  The pillow-type packaging bags 1 and 1 ′ configured as described above are directions in which the surface having the back thermal bonding portion 2 on the edge thermal bonding portion 3 side and the surface facing the surface are gripped with fingers and separated from each other. The peeling interface moves between the inner layer 12 and the unstretched resin layer 13 of the laminate 10 (see FIG. 2) and pulls continuously. As shown in FIG. 9A, the packaging bag 1 and the packaging bag 1 ′ are formed on one side of the gusset folding portion 4 ′ as shown in FIG. 9B [on FIG. [Surface side] is opened.

  4A and 4B schematically show a third embodiment of a pillow-type packaging bag according to the present invention. FIG. 4A is a perspective view of a main part from the front side, FIG. 4B is a perspective view of a main part from the back side, and FIG. Is an exploded view of the main part as seen from the inner layer side, and the pillow type packaging bag 1 "is in the vicinity of the inner edge of the edge thermal bonding part 3 located in the gusset folding part 4 'of the packaging bag 1' shown in FIG. A second cut line 51 (actually in the layer of the unstretched resin layer 13) that penetrates the inner layer 12 from the inner surface side of the laminate 10 constituting the surface having the back thermal bonding portion 2 along the inner edge. Of the laminated body 10 that forms a surface having the back thermal bonding portion 2 and a surface facing the surface having the back thermal bonding portion 2. At the position corresponding to the valley fold portion of the gusset fold portion 4 ′ of the edge thermal bonding portion 3, the first cut line 50 and One third cut line 52 extending from the second cut line 51 to the outer edge of the edge thermal bonding portion 3 in parallel with the back thermal bonding portion 2 is provided through the inner layer 12 from the inner surface side. (In fact, it is provided so that the tip of the third cut line 52 is positioned in the unstretched resin layer 13), and the rest is the same as the packaging bag 1 '.

  The pillow-type packaging bag 1 ″ configured as described above is gripped by a finger between the surface having the back thermal bonding portion 2 on the edge thermal bonding portion 3 side and the surface facing the surface, and pulled in a direction away from each other. As a result, the peeling interface moves between the inner layer 12 and the unstretched resin layer 13 of the laminated body 10 from the projecting central portion of the first cut line 50 (see FIG. 2), and is pulled continuously. The third cut line 52 reaches the third cut line 52, and the peeling interface is propagated to the second cut line 51 by this third cut line 52. Further pulling causes the packaging bag 1 "to be gusseted as shown in FIG. 9 (c). The folded portion 4 ′ is opened in a fully opened state. In addition, although the example which provided the said 3rd cut line 52 in FIG. 4 was shown, it is necessary to provide the said 3rd cut line 52 so that it may correspond with the valley fold part of the said gusset folding part 4 '. In consideration of misregistration at the time of bag making, it is appropriate to provide a plurality, specifically about three, in parallel at intervals of 0.5 mm.

  FIG. 5 is a front view schematically showing a fourth embodiment of the pillow type packaging bag according to the present invention, and FIG. 6 is an enlarged sectional view taken along line YY of FIG. FIG. 3 shows a substantially “h” shape so that the center portion of the packaging bag 1 ′ of the second embodiment shown in FIG. The edge thermal bonding portion 3 ″ is provided in a shape and faces the surface having the back thermal bonding portion 2 along the outer edge and the inner edge in the vicinity of the outer edge and the inner edge of the edge thermal bonding portion 3 ″. Fourth cut lines 53, 53 ′ penetrating the inner layer from the inner surface side of the laminate 10 constituting the surface (actually, the ends of the fourth cut lines 53, 53 ′ in the layer of the unstretched resin layer 13) The other is the same as the packaging bag 1 ′ shown in FIG. 3 and has a gusset folding portion 4 ′. This is a pillow-type packaging bag.

  The pillow-type packaging bag 1 ′ ″ configured as described above is used to grasp the surface of the unbonded portion on the edge thermal bonding portion 3 ″ side having the back thermal bonding portion 2 and the surface facing the surface with fingers. When pulled apart in a direction away from each other, the peeling interface moves between the inner layer 12 and the unstretched resin layer 13 of the laminate 10 from the center of the fourth cut line 53 protruding [see FIG. Then, when pulled further, the peeling interface moves to the fourth cut line 53 ′ and the pillow type packaging bag 1 ′ ″ is opened (see FIG. 7B), as shown in FIG. 7C. Then, one side of the gusset fold 4 '[on the front side of the paper surface in FIG. 7 (c)] is opened.

  8A and 8B schematically show a fifth embodiment of a pillow-type packaging bag according to the present invention. FIG. 8A is a perspective view of a main part from the front side, FIG. 8B is a perspective view of a main part from the back side, and FIG. Is an exploded view of the main part as seen from the inner layer side, and the pillow type packaging bag 1 "" is the edge thermal bonding part 3 "located in the gusset folding part 4 'of the packaging bag 1'" shown in FIG. Fifth cut lines 54, 54 ′ penetrating the inner layer 12 from the inner surface side of the laminate 10 constituting the surface having the back thermal bonding portion 2 along the outer edge and the inner edge in the vicinity of the outer edge and the inner edge (actual Are formed in the layer of the unstretched resin layer 13, and the tips of the fifth cut lines 54 and 54 ′ are formed), and the surface constituting the back thermal bonding portion 2 and the back thermal bonding portion 2 are The gusset fold portion of the edge thermal bonding portion 3 ″ of the laminate 10 that constitutes the surface having the opposite surface One sixth parallel to the back thermal bonding portion 2 that connects the fourth cut lines 53 and 53 'and the fifth cut lines 54 and 54' to a position corresponding to the valley folding portion of The cut line 55 is formed so as to penetrate the inner layer 12 from the inner surface side and the tip thereof is located in the unstretched resin layer 13, and other than this, it is the same as the packaging bag 1 ′ ″. is there.

  The pillow type packaging bag 1 "" configured as described above is a direction in which the surface having the back thermal bonding portion 2 on the edge thermal bonding portion 3 "side and the surface facing the surface are gripped with fingers and separated from each other. Although not shown in the figure, the peeling interface moves between the inner layer 12 and the unstretched resin layer 13 of the laminate 10 and pulls continuously, although not shown. The sixth cut line 55 is reached, and the sixth cut line 55 causes the peeling interface to propagate to the fifth cut line 54, and further pulls, thereby pulling the fourth cut line 53 ′ and the fourth cut line 55 ′. The wrapping bag 1 "" reaches the 5 cut line 54 'and is opened in a state where the gusset folding portion 4' is completely opened (see FIG. 9C). The sixth cut line 55 is Although FIG. 8 shows an example in which one is provided, the package of the third embodiment shown in FIG. A similarly to the third score line 52 of the bag 1 ', parallel to a plurality of at 0.5mm intervals in consideration of the register movement at the time of bag-making, in particular it is appropriate to provide about three.

  Although not described, the fourth embodiment shown in FIG. 5 can be applied even when the folding portion is not the gusset folding portion 4 ′ but the V-shaped folding portion 4. is there.

Next, the said laminated body 10 which comprises the packaging bags 1-1 "" is demonstrated.
As the base material layer 11 of the laminate 10, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like is used because it becomes a basic material constituting the packaging bags 1 to 1 ″ ″. For example, a polyester resin, a polyamide resin, a polypropylene resin, or the like can be used. Moreover, as a film using these resins, a stretched film stretched in a uniaxial direction or a biaxial direction is suitable. This is because usually the substrate layer 11 is often printed and printability is required. The thickness of the film constituting the base material layer 11 may be a thickness that can be kept to the minimum necessary for strength, rigidity, etc. as a basic material, and may be determined in consideration of cost and the like. It is approximately 12 to 25 μm.

  Further, the inner layer 12 of the laminate 10 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 and used depending on the physical properties required for the packaging bag 1. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene -It can be formed with a 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, as the unstretched resin layer 13 of the laminate 10, the adhesive strength between the layer 13 and the inner layer 12 is a peelable strength, specifically 0.2 to 5.0 N / 15 mm width. It is important. In the present invention, basically, the adhesive strength between the unstretched resin layer 13 and the inner layer 12 is such that the resin used for the unstretched resin layer 13 and the resin used for the inner layer 12 are made of different resins. It is necessary to select the resin that forms the unstretched resin layer 13 by the resin used for the inner layer 12 in order to obtain an interlayer strength that is 0.2 to 5.0 N / 15 mm width in terms of the adhesive strength. It is difficult to comprehensively describe these combinations collectively. For example, polyethylene layer / polypropylene layer, polyethylene layer / acid copolymer layer, polyethylene layer / ester copolymer layer, polypropylene layer / acid copolymer layer , Polypropylene layer / ester copolymer layer, or combinations of different types of polyethylene or different types of polypropylene It can be. The above-described combination can be achieved by a lamination method such as a sandwich lamination method using a T-die extruder, but may be a co-extruded film produced by a two-layer coextrusion method. Further, any of the combinations described above may be used as the unstretched resin layer 13.

  Moreover, the said laminated body 10 may provide an intermediate | middle layer and an outer layer as needed in the said inner layer 12 side of the said base material layer 11, or the surface side of the said base material layer 11. FIG. As the intermediate layer, the synthetic resin film described in the base material layer 11, a film obtained by vapor-depositing an inorganic material such as aluminum or silicon oxide, an aluminum foil, or the like can be used. As the outer layer, As in the intermediate layer, the synthetic resin film described in the base material layer 11 or a film obtained by depositing an inorganic material such as aluminum or silicon oxide on these can be used. In short, the above-described layers may be appropriately provided depending on the performance required for the packaging bag. In addition, as a method for laminating each layer, a known laminating method such as a sandwich lamination method or a dry lamination method may be used as appropriate.

  Moreover, the said cut lines 50-55 formed in the said laminated body 10 can be formed using the rotary die cutter by which the cutting edge was provided in the shape and arrangement | positioning which are shown to each figure. And in this invention, the space | interval of the said cutting line 50 and 53 on the opening start side and the opening start side edge of the said edge thermal bonding part 3, 3 '' is 1.0 mm or less, Preferably it is 0.5 mm or less More preferably, it is 0.2 mm or less, and if the distance exceeds 1.0 mm, it may be difficult to open.For this reason, the cut lines 50 and 53 are formed as a single cut line in the embodiment. However, in consideration of misregistration at the time of bag making, for example, it is appropriate to use a plurality of cutting lines at intervals of 0.5 mm, specifically, three cutting lines. In the case of the edge thermal bonding part 3, 3 ", the cut line substantially in the shape of a letter" he "is spaced by 0.5 mm so as to sandwich the cut lines 50, 53 of the protruding part. May be provided.

  Next, the present invention will be described in more detail with reference to the following examples. In addition, it demonstrates using the phrase and code | symbol which were used by description of drawings etc. until now.

[Production of Laminate 10]
A biaxially stretched polypropylene film obtained by gravure printing a black photocell mark at a 280 mm pitch on a corona discharge treated surface of a 12 μm thick biaxially stretched polyester film and then a 7 μm thick aluminum foil and a 20 μm thick double-sided corona discharge treatment. Are sequentially laminated by a dry lamination method, and an isocyanate anchor agent is applied to the biaxially oriented polypropylene film surface, and then low density polyethylene is extruded to a thickness of 25 μm on the anchor agent application surface by a T-die extruder. An unstretched polypropylene film having a thickness of 60 μm was laminated by a sandwich lamination method to produce an intermediate laminate. After that, in the shape and arrangement shown in FIG. 4 (c) from the unstretched polypropylene film side of the intermediate laminate, the cut lines 50, 51, 52 whose tips are located in the low-density polyethylene layer are photoelectric tube marks. A laminate 10 formed with a rotary die cutter was prepared while keeping the register. The low density polyethylene layer corresponds to the unstretched resin layer 13 described so far.
[Production of packaging bags]
The laminated body 10 is made with a gusset bag making machine while filling regular coffee powder (500 g), and the back edge thermal bonding part 2 is 10 mm wide and the upper edge thermal bonding part has a V-shaped protrusion 30 at the center. 3. A pillow type packaging bag 1 ′ having a gusset fold portion 4 ′ having a gusset fold portion 4 ′ having a width of 10 mm each, a bottom edge thermal bonding portion of 10 mm width, a longitudinal dimension of 200 mm, a transverse dimension of 120 mm, and a gusset fold portion 4 ′ of 30 mm. Produced.

[Production of Laminate 10]
Gravure-printed black phototube marks on a corona discharge treated surface of a 20 μm thick biaxially stretched polypropylene film at a pitch of 300 mm, and a polyethyleneimine-based anchor agent is applied to the printed surface, and low-density polyethylene is applied to the anchor agent-coated surface. A 12 μm thick aluminum-deposited biaxially stretched polyester film is laminated to a thickness of 15 μm using a T-die extruder, and an isocyanate-based anchor agent is applied to the polyester film surface. Density polyethylene was extruded to a thickness of 20 μm with a T-die extruder, and an unstretched polypropylene film having a thickness of 40 μm was laminated by a sandwich lamination method to produce an intermediate laminate. Thereafter, a cut line 50 having the shape and arrangement described in FIG. 1 from the unstretched polypropylene film side of the intermediate laminate, the tip of which is located in the low-density polyethylene layer adjacent to the unstretched polypropylene film is a photoelectric tube. The laminated body 10 formed with the rotary die cutter was produced while aligning with the mark. The low-density polyethylene layer adjacent to the unstretched polypropylene film corresponds to the unstretched resin layer 13 described so far.
[Production of packaging bags]
The laminated body 10 is made with a pillow packaging machine while filling with potato chips (70 g), the back thermal bonding part 2 is 10 mm wide, the upper edge thermal bonding part 3 having a V-shaped protrusion 30 at the center, and A pillow type packaging bag 1 shown in FIG. 1 having a bottom edge thermal bonding portion 3 ′ each having a width of 10 mm, a longitudinal dimension of 300 mm, and a transverse dimension of 200 mm was produced.

  The pillow-type packaging bags 1 and 1 ′ produced from the laminates of Examples 1 and 2 produced above have the surface constituting the back thermal bonding part 2 on the upper edge thermal bonding part 3 side and the back thermal bonding part 2. When the surface having the surface and the opposite surface are picked with fingers and pulled in a direction away from each other, it can be easily opened according to the opening function of the present invention described above, and a beautiful opening can be obtained. .

1 is a front view schematically showing a first embodiment of a pillow-type packaging bag according to the present invention. It is an expanded sectional view of the XX line of FIG. It is a principal part perspective view which shows 2nd Embodiment of the pillow type packaging bag concerning this invention illustratively. 3A schematically shows a third embodiment of a pillow type packaging bag according to the present invention, FIG. 3A is a perspective view of a main part from the front side, FIG. 2B is a perspective view of a main part from the back side, and FIG. It is the principal part expanded view seen from. FIG. 10 is a front view schematically showing a fourth embodiment of a pillow-type packaging bag according to the present invention. It is an expanded sectional view of the YY line of FIG. It is a figure which illustrates the opening method and opening state of the pillow type packaging bag of FIG. 5A schematically shows a fifth embodiment of a pillow type packaging bag according to the present invention, FIG. 3A is a perspective view of a main part from the front side, FIG. 5B is a perspective view of a main part from the back side, and FIG. It is the principal part expanded view seen from. It is a principal part perspective view which shows an open state.

Explanation of symbols

1, 1 ', 1 ", 1'", 1 "" Pillow type packaging bag 2 Back thermal bonding part 3, 3 ', 3 "Edge thermal bonding part 4, 4' Folding part 10 Laminate 11 Base material layer 12 Inner layer 13 Unstretched resin layer 30 Protruding part 50, 51, 52, 53, 53 ', 54, 54', 55 Cut line

Claims (10)

A back heat-bonded portion thermally bonded in the form of a palm, and folded portions on both side edges parallel to the back heat-bonded portion in which both end edges in a direction orthogonal to the back heat-bonded portion are sealed with an edge heat-bonded portion; Between the inner layer and the unstretched resin layer, at least a base layer, an inner layer made of a heat-adhesive resin, and an unstretched resin layer adjacent to the base layer side surface of the inner layer are provided. Adhesive strength is a pillow-type packaging bag made of a laminate configured to be peelable, and is opposed to a surface having the back thermal bonding portion along the inner edge in the vicinity of at least one inner edge of the edge thermal bonding portion. A pillow-type packaging bag is characterized in that a first cut line penetrating the inner layer is formed from the inner surface side of the laminate constituting the surface to be formed. The pillow type packaging bag according to claim 1, wherein a central portion of an inner edge of at least one of the edge thermal bonding portions protrudes to the other side of the edge thermal bonding portion. The pillow type packaging bag according to claim 1, wherein the folded portion is a gusset folded portion. The pillow-type packaging bag according to claim 3, wherein the laminated layer is configured to form a surface having the back thermal bonding portion along the inner edge in the vicinity of at least one inner edge of the edge thermal bonding portion located in the gusset folding portion. A second score line penetrating the inner layer from the inner surface side of the body and forming the surface having the back thermal bonding portion and the surface facing the surface having the back thermal bonding portion; The edge thermal bonding in parallel to the back thermal bonding part from the first cut line and the second cut line at a position corresponding to the valley folding part of the gusset folding part of at least one of the edge thermal bonding parts A pillow type packaging bag, wherein one or a plurality of third cut lines extending to at least one outer edge of the portion are provided through the inner layer from the inner surface side. A back heat-bonded portion thermally bonded in the form of a palm, and folds on both side edges parallel to the back heat-bonded portion in which both ends in a direction orthogonal to the back heat-bonded portion are sealed with edge heat-bonded portions; Adhesion between the inner layer and the unstretched resin layer is provided with at least a material layer, an inner layer made of a heat-adhesive resin, and an unstretched resin layer adjacent to the surface of the inner layer on the base material layer side A pillow-type packaging bag made of a laminate that is configured to be peelable, wherein one of the edge thermal bonding portions is provided leaving an unbonded portion on the edge, and the one edge thermal bonding portion In the vicinity of the outer edge and the inner edge, a fourth cut line penetrating the inner layer is formed from the inner surface side of the laminate that forms a surface that faces the surface having the back thermal bonding portion along the outer edge and the inner edge. A pillow-type packaging bag characterized by having 6. The pillow type packaging bag according to claim 5, wherein a central portion of the one edge thermal bonding portion protrudes toward the edge having an unbonded portion. The pillow type packaging bag according to any one of claims 5 and 6, wherein the folded portion is a gusset folded portion. The pillow type packaging bag according to claim 7, wherein a surface having the back thermal bonding portion along the outer edge and the inner edge is formed in the vicinity of an outer edge and an inner edge of the one edge thermal bonding portion located in the gusset folding portion. The laminate that forms a fifth cut line that penetrates the inner layer from the inner surface side of the laminate and that has a surface having the back thermal bonding portion and a surface facing the surface having the back thermal bonding portion. 1 parallel to the back thermal bonding portion connecting the fourth cut line and the fifth cut line to a position corresponding to a valley fold portion of the gusset folding portion of the one edge thermal bonding portion of the body. The pillow type packaging bag is characterized in that a plurality of sixth cut lines are provided through the inner layer from the inner surface side. The packaging bag according to any one of claims 1 to 8, wherein the inner layer and the unstretched resin layer are made of different resins. The packaging bag according to any one of claims 1 to 9, wherein an adhesive strength between the inner layer and the unstretched resin layer is 0.2 to 5.0 N / 15 mm width.

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