JP2006282179A - Gusset type packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gusset type packaging bag which can be unsealed easily, and can have an opening of an almost constant shape. <P>SOLUTION: The counter edges of a rectangular lamination, which has a base layer and an inner layer made of an easily peelable heat adhesive resin, are superposed and glued together by heat to form a cylindrical body having a mating sealed part. A folding part having a V-shaped side section is formed on both sides of the cylindrical body, and upper/lower openings are sealed at the upper/lower end heat adhesive parts of the cylindrical body to form the gusset type packaging bag 1. The upper end heat adhesive part 3 consists of a first upper end heat adhesive part 30 which extends from a side edge closer to one folding part toward the other folding part, a second upper end heat adhesive part 31 which is connected to the termination of the first heat adhesive part 30 and extends toward a side edge closer to the other folding part, and a third upper end heat adhesive part 32 which is connected to the termination of the second heat adhesive part 31 and extends toward the edge of the upper opening. The adhesive parts 30, 31, 32 are so fomed that the upper end heat adhesive part 3 has a nonadhesive part C closer to one folding part, the nonadhesive part C extending from the edge of the upper opening toward the lower opening. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gusset type packaging bag that can be easily opened.

Conventionally, the content storage volume [packaging internal volume (cm ³ ) / packaging material area (cm ² ) ratio] is large, the packaging material cost per unit content of the content is low, and the upright state The gusset-type packaging bag is used as a bag suitable for a large amount of contents because it is advantageous in terms of space since it can be displayed on the market and the product looks good.

  However, gusset-type packaging bags have folds with a V-shaped cross section on both sides, and V-shaped and I-shaped cuts and cuts are provided at the edges perpendicular to the fold-off part from which this fold-up part is removed. The bag is opened using this as an opening start means. When the bag is opened by this opening start means, it opens in an irregular shape in the longitudinal direction (direction parallel to the folding part). In the case of contents such as powder or granules, the contents are not There are problems such as spilling and scattering to the surroundings, and when storing contents remaining after use, there is a problem that it is quite complicated to close the opened opening.

  Then, the gusset type packaging bag which solves the said problem is proposed (for example, refer patent document 1). The idea described in Patent Document 1 is a proposal in which a device for opening a gusset-type packaging bag in a lateral direction (a direction perpendicular to the folding portion) is incorporated, and a side seal portion is provided on a lateral side portion of the bag body. In addition, the side seal portion is provided with a notch capable of tearing the inside of the opening seal portion in the lateral direction, and the folded inner tip corner portion and the front and back surfaces on the planned tear line extending from the notch are spot-like at the folding portion located on the opposite side of the notch It is a gusset type packaging bag having a structure integrated by welding at the heat seal portion of the gusset, and the gusset type packaging bag is formed in this way so that the gusset type packaging bag has a substantially constant shape in the lateral direction (direction perpendicular to the folding portion). Even in the case of contents such as powders and granules that can be opened, there is no risk of the contents spilling at the time of opening, and the opened opening can be easily stored when storing the contents remaining after use Gukoto is that it is.

However, when the present inventor actually tried to tear and open the bag based on the idea described in Patent Document 1, it can be easily torn up to the corner of the folding end on the opening side, but it is further torn and torn. When the tip reached the folded internal tip corner of the spot-like heat seal portion, the folded internal tip corner became a large anti-tear portion at the time of tearing, and could not be torn smoothly.
Japanese Utility Model Publication No. 5-26838

  Therefore, the present invention can be easily opened, an opening having a substantially constant shape can be obtained, and the folded portion on the opened side can be pulled out to serve as a spout to easily take out the contents. It is to provide a gusset type packaging bag.

  In order to achieve the above object, the inventor of the present invention is directed to a rectangular laminate including at least a base material layer and an inner layer made of an easily peelable thermoadhesive resin. The end edges are overlapped so that the inner layers are in contact with each other and thermally bonded to form a cylindrical body having a palm seal part, and provided with folded portions with a V-shaped cross section on opposite sides of the cylindrical body, In the gusset-type packaging bag in which the upper and lower openings are sealed by the upper and lower end heat bonding portions, the upper end heat bonding portion has an unbonded portion on the one opening portion side from the edge of the upper opening portion to the lower opening portion side. The first upper end thermal bonding portion extending from the side edge on the one folding portion side to the other folding portion side, and the side on the other folding portion side connected to the terminal end of the first upper end thermal bonding portion A second upper end thermal bonding portion extending to an edge and an end of the upper opening connected to the second upper end thermal bonding portion; And it is characterized in that comprising a third upper heat seal portion extending.

  Moreover, the present invention described in claim 2 is characterized in that, in the gusset-type packaging bag described in claim 1, the first upper end heat bonding portion is a linear heat bonding portion.

  Moreover, the present invention according to claim 3 is the gusset type packaging bag according to any one of claims 1 and 2, wherein the first upper-end adhesive portion has a convex shape on the upper opening side. It is a heat bonding part of this.

  Further, the present invention according to claim 4 is characterized in that, in the gusset-type packaging bag according to claim 1, the display portion that clearly indicates that the unbonded portion is an unsealed portion is provided at a position where it can be seen from the outside. It is what.

  The gusset-type packaging bag of the present invention uses an easily peelable heat-adhesive resin for the inner layer, and this part is provided by providing an unadhered part on the upper opening side where a finger can be inserted and picked when opened. Can be easily peeled off and opened, and the folded part on the peeled side is pulled out to make a spout, and the contents can be easily taken out from this spout. The size of the opening to be adjusted can be adjusted by the length extending from the side edge on the one folding part side of the first upper end adhesive part to the other folding part side, and an opening of a desired size can be easily obtained In addition, the first upper end thermal bonding portion is made into a linear thermal bonding portion, more preferably a substantially U-shaped thermal bonding portion having a convex portion on the upper opening side. It can be easily peeled and opened by force It is intended to achieve the effect.

  FIG. 1 is a front view of an essential part showing a first embodiment of a gusset type packaging bag according to the present invention, FIG. 2 is a schematic plan view schematically showing the upper opening of FIG. 1, and FIG. 3 is a gusset type according to the present invention. The principal part front view which shows 2nd Embodiment of a packaging bag, FIG. 4 is a principal part front view which shows 3rd Embodiment of the gusset type packaging bag concerning this invention, FIG. 5 is the 1st of the gusset type packaging bag concerning this invention. It is a principal part front view which shows 4 embodiment, 1, 1 ', 1 ", 1'" in a figure is a gusset type packaging bag, 2 is a joint seal part, 3 is an upper end heat bonding part, 4 is a display part , 30, 30 ′, 30 ″ are the first upper end heat-bonded portions, 31, 31 ′ are the second upper end heat-bonded portions, 32, 32 ′ are the third upper end heat-bonded portions, A, B are the folding portions, and C is not Each adhesion part is shown.

  FIG. 1 is a front view of an essential part showing a first embodiment of a gusset type packaging bag according to the present invention. FIG. 2 is a schematic plan view schematically showing an upper opening of FIG. A palm seal portion 2 that is heat-bonded by superimposing the opposing edges of a rectangular laminate including at least a base material layer and an inner layer made of an easily peelable thermoadhesive resin so that the inner layers are in contact with each other. It has a cylindrical body, and is provided with folding parts A and B having a V-shaped cross section on opposite sides of the cylindrical body, and the upper and lower opening portions are the upper end thermal bonding portion 3 and the lower end thermal bonding portion (not shown). In which the upper end thermal bonding portion 3 has a non-bonded portion C on the lower opening side from the edge of the upper opening portion on the folding portion A side. A band-shaped first upper end thermal bonding portion 30 extending from the side edge toward the other folded portion, and the first upper end thermal contact A second upper end thermal bonding portion 31 extending to the side edge on the other folding portion side and connected to the terminal end of the portion 30; and a second upper end thermal bonding portion 31 extending to the edge of the upper opening portion. It consists of three upper end thermal bonding portions 32.

  FIG. 3 is a front view of an essential part showing a second embodiment of the gusset type packaging bag according to the present invention, and the gusset type packaging bag 1 ′ has a strip shape of the first upper end heat bonding portion 30 shown in the first embodiment. The first upper end heat-bonding portion 30 ′ is replaced by a narrow linear shape, and accordingly, the second upper-end heat bonding portion is denoted by reference numeral 31 ′, the third upper-end heat bonding portion is denoted by reference numeral 32 ′, and the upper end. The thermal bonding part is represented by reference numeral 3 ', and the other parts are the same as those of the gusset type packaging bag 1 of the first embodiment.

  FIG. 4 is a main part front view showing a third embodiment of the gusset-type packaging bag according to the present invention, and the gusset-type packaging bag 1 ″ is the linear first upper end heat bonding portion 30 shown in the second embodiment. Instead of ', the first upper end heat-bonding portion 30 "having a convex shape on the upper opening side is used, and accordingly, the upper-end heat bonding portion is represented by reference numeral 3". Other than this, it is the same as the gusset type packaging bag 1 ′ of the second embodiment.

  The gusset-type packaging bags 1, 1 ′, 1 ″ configured as described above are formed by pulling the opposing portions (laminates) of the unbonded portion C with fingers of both hands and pulling them away from each other. Since the upper end heat bonding portions 30, 30 ′, 30 ″ are aggregated and separated at the interface between the inner layers and / or between the inner layers, they can be easily opened. A spout is formed by pulling out the outside, and the contents can be easily taken out from this spout into another container or the like. As ease of opening, it can be set as a gusset type packaging bag which is easy to open as descending from the first embodiment to the third embodiment.

  FIG. 5 is a front view of an essential part showing a fourth embodiment of a gusset type packaging bag according to the present invention, and a gusset type packaging bag 1 ′ ″ shows a portion to be picked with a finger to open and a portion to be opened. Open the part indicated by the arrow by picking this part. "The display part 4 is provided on the bag by printing or printing, and is configured to be opened by all users. The method and location to be clarified can be clarified. In addition, although FIG. 5 showed what was provided in the gusset type packaging bag 1 of 1st Embodiment shown in FIG. 1, it is natural that it is not restricted to this.

  In addition, in the Example, although the orthodox gusset type packaging bag which has the joint seal part 2 in the center of the packaging bag was shown, this invention is not limited to this, For example, the joint seal part 2 is inserted into the folding part A. You may comprise so that it may be located in one side edge, and in this case, the other side edge (ridgeline) of the folding part A and two side edges (ridgeline) of the folding part B are heated. It is good also as a structure which provided the support | pillar to four side edge (ridgeline) by adhere | attaching, and also in an Example, four side edge (ridgeline) formed by the folding parts A and B is heat-processed. As described above, it is possible to adopt a configuration in which pillars are provided on the four side edges (ridge lines) in the same manner as described above, and in this manner, a structure in which pillars are provided on the four side edges (ridge lines). Therefore, it should be a gusset-type packaging bag with excellent independence and good appearance. Can.

  Next, the laminated body used for the gusset type packaging bag of this invention is demonstrated. As the base material layer of the laminate used in the gusset packaging bag of the present invention, a synthetic resin film having properties excellent in mechanical, physical, chemical, etc., for example, a polyester-based, polyamide-based, polypropylene-based resin, etc. Examples thereof include a stretched film stretched in the biaxial direction, cellophane and paper.

  Further, the inner layer of the laminate used in the gusset type packaging bag of the present invention is a layer made of a heat-adhesive resin having an easily peelable property that causes cohesive peeling between the interface between the inner layers and / or between the inner layers. For example, Tose Cello Co., Ltd. product: TAF-650C, Toray Film Processing Co., Ltd. product: 7601A, or J Film Co., Ltd. product: SMX (Y-04) can be suitably used. .

  In addition, the laminate used in the gusset packaging bag of the present invention includes the above-described base layer as an intermediate layer with a barrier layer for imparting gas barrier properties such as oxygen gas and water vapor gas and / or light shielding properties as necessary. It may be provided between the material layer and the inner layer, for example, a metal foil typified by aluminum foil, a film of polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, or polyester, Polyamide, polyethylene, polypropylene, ethylene-propylene copolymer and other polyolefin films, polyvinyl alcohol, and other films coated with polyvinylidene chloride or inorganic materials such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, and zirconium oxide The evaporated film In addition, as the intermediate layer, in order to impart functions such as mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, chemical resistance to the packaging bag In addition, for example, the reinforcing layer may be a combination of one or more of polyolefins such as polyester, polyamide, polyethylene, polypropylene, and ethylene-propylene copolymer. The reinforcing layer may be in an unstretched state or a stretched state, and the barrier layer and the reinforcing layer may be used in combination depending on the physical properties required for the packaging bag, or may be used alone. It ’s good.

  Moreover, as a lamination | stacking method which laminates | stacks each above-mentioned layer to make a laminated body, appropriate lamination | stacking methods, such as the sandwich lamination method laminated | stacked using a T-die extruder, the dry lamination method laminated | stacked using an adhesive agent, etc. are used. What is necessary is just to select and laminate | stack.

It is a principal part front view which shows 1st Embodiment of the gusset type packaging bag concerning this invention. FIG. 2 is a schematic plan view schematically showing an upper opening of FIG. 1. It is a principal part front view which shows 2nd Embodiment of the gusset type packaging bag concerning this invention. It is a principal part front view which shows 3rd Embodiment of the gusset type packaging bag concerning this invention. It is a principal part front view which shows 4th Embodiment of the gusset type packaging bag concerning this invention.

Explanation of symbols

1, 1 ', 1 ", 1'" Gusset type packaging bag 2 Joint seal part 3 Upper end thermal bonding part 4 Display part 30, 30 ', 30 "First upper end thermal bonding part 31, 31' Second upper end thermal bonding Part 32, 32 'Third upper end heat bonding part A, B Folding part C Non-bonding part

Claims (4)

At least a base material layer and an inner layer made of a heat-adhesive resin having easy peelability are stacked so that the opposing edges of a rectangular laminate are in contact with each other so that the inner layers come into contact with each other, and a joint seal part is formed. In the gusset-type packaging bag in which a folded portion having a V-shaped cross section is provided on both opposing side portions of the cylindrical body, and the upper and lower openings are sealed by upper and lower thermal bonding portions, the upper end thermal bonding The first extending from the side edge of the one folding part to the other folding part side so that the part has an unbonded part from the edge of the upper opening to the one opening part. A first upper end thermal bonding portion, a second upper end thermal bonding portion extending to a side edge on the other folding portion side and connected to an end of the first upper end thermal bonding portion, and a second upper end thermal bonding portion; And a third upper end thermal bonding portion extending to an edge of the upper opening. Up packaging bag. The gusset-type packaging bag according to claim 1, wherein the first upper end heat bonding portion is a linear heat bonding portion. The gusset-type packaging bag according to any one of claims 1 and 2, wherein the first upper end bonding portion is a substantially U-shaped thermal bonding portion having a convex portion on the upper opening side. The gusset-type packaging bag according to claim 1, wherein a display portion that clearly indicates that the unbonded portion is an unsealed portion is provided at a position visible from the outside.

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