JP2008230658A - Easily openable gusset bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily openable gusset bag of a four-corner seal type that can be torn and opened from the upper end margin along an opening perforation and can be easily opened by peeling the gusset portion after the arrival of the opening at a hot melt bonded part of the side end margin to form a beautiful opened mouth. <P>SOLUTION: The four corner seal gusset bag is composed of pair of wall surface sheets and a pair of side surface sheets, each being a laminate of a base material layer and a hot melt-bonding resin layer, and has side end margin hot melt-bonded parts formed at four corners by hot melt-bonding the side end margins of the surfaces of the face to face arranged hot melt-bonding resin layers of the wall surface sheets and the side surface sheets and an upper hot melt-bonded part in the upper portion wherein the opening perforation extending obliquely downward from the upper end of a pair of the wall surface sheets between the gussets mounted on the side and spreading over one hot melt-bonded part of the side end margin is mounted on the base material layer of a pair of the wall surface sheets, and the gusset part is opened by tearing a pair of the wall surface sheets from the upper end margin along the opening perforation and peeling the side surface sheet from the wall surface sheet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a four-corner seal gusset bag having side edge thermal adhesive portions at the four corners, and more particularly to an easy-open gusset bag that can be teared along an opening cut line and easily peeled off and opened from the gusset portion.

  Conventionally, four-sided seals, three-sided seals, gusset bags, or self-supporting bags having a gusset portion at the bottom are used as packaging bags for storing snacks, snack foods, hail, biscuits, snacks, and the like. Among them, gusset bags and self-supporting bags can have a three-dimensional shape because they have a gusset portion, and are widely used with a large storefront effect. In particular, gusset bags can be increased in capacity and are convenient for sellers. . The gusset bag includes a type having a back pasting portion and a four-corner seal gusset bag provided with side edge thermal bonding portions at four corners of the gusset portion.

  However, it is difficult for the gusset bag to form a large opening because the side gusset portion inhibits the opening at the time of opening. For this reason, it is necessary to cut the space between the upper thermal bonding portion and the contents using a tool such as scissors at the time of opening, which is cumbersome and takes time to open.

  In order to facilitate the opening of these gusset bags, in a bag of a type having a back pasting portion using a soft packaging material made of a plastic film or the like, one side or both of the corresponding side surfaces of the bag A gusset bag is disclosed that is configured by integrally providing a wide tear guide reinforcing member that covers almost the entire surface of a wall surface (see, for example, Patent Document 1). However, in the upper and lower seal parts of the gusset bag, both sides increase in thickness by the thickness of the guide reinforcement, the adhesive strength of the upper and lower seal parts decreases, and a step is formed at the boundary with the part without the guide reinforcement. For this reason, there is a problem that pinholes are generated and sufficient sealing performance cannot be maintained.

  Also, a modified hexagonal cylindrical package comprising six side surfaces defined by six sides substantially parallel to each other and back bonding, and forming a valley fold line in which one pair of the six sides is folded inward The back pasting is provided on a surface of the side surface that does not include the valley fold line, and along two sides adjacent to at least one of the valley fold lines among the six sides. A gusset bag is proposed in which a belt-like adhesive portion is provided, and an opening start means is provided between the back adhesive and the belt-like adhesive portion at at least one end of each end of the deformed hexagonal cylinder. (For example, see Patent Document 2).

According to the invention of the above-mentioned Patent Document 2, the sealing property of the gusset bag can be maintained, but the band-like shape is formed while tearing the package from the opening start means (V-shaped notch) provided at one end and causing a meandering opening line. After reaching the heat-bonded part, the unsealed line propagates along the belt-shaped heat-bonded part and is torn, and from the opening start means until the unsealed line reaches the band-shaped heat-bonded part. The problem is that the distance is long, the opening is irregular and irregular, and the opening of the opening line along the heat-bonded part is not smooth and the appearance is not good. There is.
JP-A-2-258558 JP 2006-176143 A

  Therefore, the present invention solves the above-mentioned problems, can tear and open from the upper edge along the opening cut line, and after the opening reaches the side edge thermal bonding portion, it is peeled between the side sheet and the wall sheet. Another object of the present invention is to provide a four-corner seal gusset type easy-open gusset bag that can be easily peeled off and opened from the gusset portion and has a beautiful opening.

  To achieve the above object, the present invention comprises a pair of wall sheets and a pair of side sheets in which a base material layer and a heat-adhesive resin layer are laminated. The heat-adhesive resin layer surfaces of the wall sheet are arranged so as to face each other, and the heat-adhesive resin layers of the pair of side sheets are externally faced and folded inward at the center, and side portions on both sides between the wall sheets. Each of the wall sheet and the side sheet are thermally bonded at the side edges of the heat-adhesive resin layer surfaces facing each other to form side edge thermal bonding portions at the four corners, provided with gusset portions, A four-corner seal gusset bag having an upper thermal bonding portion orthogonal to the side edge thermal bonding portion, and extending obliquely downward from the upper ends of the pair of wall sheets between the gusset portions provided on the side portion The opening cut line across the side edge thermal bonding part of Provided on the base material layer of the pair of wall sheets, tearing the pair of wall sheets along the opening cut line from the upper edge, and peeling between the side sheets and the wall sheet, It is an easy-open gusset bag characterized by opening from a gusset portion.

  Moreover, the present invention according to claim 2 is characterized in that, in the easily openable gusset bag according to claim 1, an opening start means is provided at an end of the opening cut line at the upper end of the wall sheet. Is.

  Moreover, this invention of Claim 3 WHEREIN: The easily openable gusset bag of Claim 1 or 2 WHEREIN: The said opening cut line consists of the intermittent cut | interruption which penetrates only the said base material layer of the said wall surface sheet. It is a feature.

  The present invention is provided in the base material layer of the pair of wall sheets, an opening cut line extending obliquely downward from the upper ends of the pair of wall sheets between the gusset portions provided on the side portions and straddling one side edge thermal bonding portion, In addition, the side edge thermal bonding portion formed by heat bonding at the side edge of the side sheet and the wall sheet is configured to be thermally bonded in a peelable manner, so that the opening cut from the upper edge of the easy-open gusset bag. A pair of wall sheets are torn along the line of sight, and when they reach the side edge thermal bonding part, they are peeled off between the side sheets and the wall sheet, so that they can be made into a beautiful opening, and can be made into a wide opening. This is an effect.

  Furthermore, since the opening position of the opened gusset part can be stopped at an arbitrary position, it is possible to provide an opening having an arbitrary width according to the ease of taking out the contents. Furthermore, after the contents are dispensed, the opening piece can be closed by returning the opening piece to the original, and the lid can be functioned.

  Further, since the side edge thermal bonding portions are provided at the four corners, the portions become pillars, so that the self-supporting property as a gusset bag is improved, and an excellent storefront effect is obtained. Further, when the side gusset portion is set in the vertical direction, the lower side edge thermal bonding portion can be self-supported as a leg, and a can-like form can be obtained.

  Further, the present invention described in claim 2 facilitates opening from the opening cut line by providing an opening start means, and the present invention described in claim 3 uses the opening cut line as a base material layer. The wall sheet is easily torn along the opening cut line by using intermittent cuts that penetrate only the cut line.

Embodiments of the present invention will be described in detail below with reference to the drawings.
1 is a front view showing an embodiment of an easy-open gusset bag according to the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. 3 is an easy-open gusset bag of FIG. FIG. 4 is a perspective view illustrating a packaging body containing contents, and FIG. 4 is a perspective view illustrating an opened state of the easy-open gusset bag of FIG. 3. In the figure, A and A ′ are easy-opening gusset bags of one embodiment, e is an end point of an opening cut line, G is a gusset portion, P is an opening cut line and a ridge line that is mountain-folded inside the gusset portion. Intersection, Q is an opening piece, R is an opening, 1 is a wall sheet, 2 is a side sheet, 3 is a side part, 4 is a side edge thermal adhesive part, 5 is an upper thermal adhesive part, 6 is an opening score line, 7 is a V-shaped notch as an opening start means, 8 is a notch, 9 is a lower thermal bonding portion, 10 is a base material layer, and 20 is a thermal adhesive resin layer.

  FIG. 1 is a front view showing an embodiment of an easy-open gusset bag according to the present invention, and FIG. 2 is a cross-sectional view taken along the line XX of FIG. FIG. As shown in FIGS. 1 and 2, the easy-open gusset bag A according to the present invention includes a pair of wall sheets 1 and a pair of side sheets 2 in which a base layer 10 and a heat-adhesive resin layer 20 are laminated. The heat-adhesive resin layers 20 and 20 of the pair of wall sheets 1 are arranged so as to face each other, and the heat-adhesive resin layers 20 of the pair of side sheets 2 are arranged on the outer surface and folded inward at the center. 1 and 1 are inserted into the side portions 3 and 3 on both sides, and the heat-adhesive resin layers 20 and 20 facing each other on the wall surface sheet 1 and the side surface sheet 2 are thermally bonded at the side edges of the side surfaces. This is a four-corner seal gusset bag in which the thermal bonding portion 4 is formed at the four corners, the gusset portion G is provided, and the upper thermal bonding portion 5 orthogonal to the side edge thermal bonding portion 4 is provided on the upper portion. Further, the side edge thermal bonding portion 4 is thermally bonded so as to be peelable between the wall sheet 1 and the side sheet 2. A lower heat bonding portion 9 is provided at the lower end, and after the contents are stored in the easy-open gusset bag A, they are thermally bonded and sealed. In FIG. 1, it is in an unbonded state and is indicated by a dotted line.

A pair of wall surface sheets 1, 1 has base material layers 10, 10 having one side edge thermal bonding portion 4 extending obliquely downward starting from the upper end between gusset portions G, G provided on side portions 3, 3. An opening score line 6 having an end point e as the straddle outer edge is provided. A V-shaped notch 7 is provided at the upper end of the wall sheets 1 and 1 as an opening start means, and the tip of the V-shaped notch 7 is connected to the opening cut line 6. With such a configuration, the pair of wall surface sheets 1 and 1 are torn along the opening cut line 6 from the V-shaped notch 7, and the gusset portion is separated between the side surface sheet 2 and the wall surface sheet 1. Can be opened from G. In addition, it is preferable to provide the opening start means because it can be opened easily, and the above-mentioned V-shaped notch, I-shaped notch, U-shaped notch, turtle-shaped notch and the like can be used. Moreover, although the end point e of the opening cut line 4 is the outer edge of the side edge thermal bonding portion 4, it may be anything that straddles the side edge thermal bonding portion 4.

The starting point of the opening cut line 6 provided on the base material layer 10 is not particularly limited as long as it is between the upper gusset portions G and G of the wall surface sheet 1, but the gusset portion G of the easy-open gusset bag A is folded. In this state, it is preferable that the intersection P between the opening cut line 6 and the ridge line folded inward on the inside of the gusset portion G is provided below and in the vicinity of the edge of the upper thermal bonding portion 5. When the intersection point P intersects with the upper thermal bonding portion 5, tearing and unsealing properties are deteriorated. On the other hand, as the distance from the upper thermal bonding portion 5 increases, the function of the lid that closes the opening is lowered by returning the opening piece to be described later. The opening cut line 6 may be provided by a bent line, a curve, or a combination thereof. It is preferable that the opening cut line 6 includes intermittent cuts 8 and penetrates the base material layer 10. The length of the cut 8 is preferably 0.3 to 2.0 mm, and more preferably 0.5 to 1.5 mm. The length of the gap 8 (non-cut) is preferably 0.3 to 1.0 mm, more preferably 0.5 to 0.8 mm. If the length of the non-cut exceeds 1.0 mm, the opening direction may deviate from the opening cut line 6. On the other hand, if it is less than 0.3 mm, the uncut line may be cut during the production of the laminate of the wall sheet 1 and the side sheet 2, and it is not preferable because the laminate may be cut or wrinkled during the production.

  Next, the base material layer 10 and the thermoadhesive resin layer 20 constituting the wall surface sheet 1 and the side surface sheet 2 will be described. For the base material layer 10, biaxially stretched, uniaxially stretched or unstretched film such as polypropylene, polyethylene terephthalate, nylon, polyvinylidene chloride, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, etc. Biaxially stretched films of the above-mentioned type, and films coated with a gas barrier composition such as polyvinylidene chloride and polyvinyl alcohol on the above films, or films deposited with metal oxides such as aluminum oxide and inorganic substances such as silicon oxide, etc. Is used. These films may be of any thickness, but those having a thickness of about 9 to 50 μm are used for ordinary packaging.

  The base material layer 10 can be provided with a printing layer by ordinary gravure printing or flexographic printing, and known gravure ink and flexographic ink can be used as the printing ink used for the printing. What is necessary is just to select the ink used favorably with the film used for the material layer 10.

  In addition, depending on the contents stored in the easy-open gusset bag A, the functions required for the easy-open gusset bag A, such as oxygen permeability, water vapor permeability, light shielding, puncture strength, and drop strength, are different. In order to satisfy the required functions, aluminum foil, aluminum vapor-deposited plastic film, metal oxides such as aluminum oxide, and inorganic substances such as silicon oxide are vapor-deposited between the base layer 10 and the thermal adhesive resin layer 20 A film having a barrier property such as a plastic film, a plastic film coated with a gas barrier composition such as polyvinyl alcohol, and an ethylene vinyl alcohol copolymer film can be used.

  The thermal adhesive resin layer 20 includes low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene / vinyl acetate copolymer, ionomer, polypropylene or easily peelable thermal adhesive resin (EPR). Etc. are used by film or extrusion lamination. In addition, as a method for imparting easy peelability of EPR, a method of forming a multilayer structure in which a thin layer having a weak adhesive force is provided on the surface, a method of expressing easy peelability by a configuration such as blending a resin having low compatibility, etc. These known ones are appropriately employed. Each of the above layers is laminated by a known technique such as a dry lamination method or an extrusion lamination method to form a laminate for the wall surface sheet 1 and the side sheet 2.

  In addition, although the same thing can be used for the thermoadhesive resin layer 20 used for the wall surface sheet 1 and the side surface sheet 2, a combination of different resins, for example, the thermoadhesive resin layer 20 of the wall surface sheet 1 has a linear low It is preferable to employ EPR for the heat-adhesive resin layer 20 of the density polyethylene and the side sheet 2 because it is easy to control the peelability between the wall sheet 1 and the side sheet 2 of the side edge thermal bonding part 4.

  Next, an example of a method for producing the easy-open gusset bag A will be described as a representative example in which an intermediate layer is laminated on the wall sheet 1 and the side sheet 2. First, in the wall surface sheet 1, the opening cut line 6 can be put in a predetermined position simultaneously with printing on the base material layer 10 by a rotary die roll or the like. Further, after printing, the opening cut line 6 may be put at a predetermined position by, for example, a rotary die cutter or a pulse oscillation type laser irradiation. Thereafter, the intermediate layer and the heat-adhesive resin layer 20 are sequentially laminated by the dry lamination method or the extrusion lamination method, and the winding of the laminate for the wall sheet 1 is manufactured. In the side sheet 2, the base material layer 10, the intermediate layer, and the heat-adhesive resin layer 20 are sequentially laminated by a dry lamination method or an extrusion lamination method, and winding of the laminated body for the side sheet 2 is manufactured. Thereafter, the easy-open gusset bag A is made by a well-known gusset bag making machine, a self-supporting bag making machine, or the like while feeding the wall sheet 1 and the side sheet 2 from the respective paper feeding units. The opening cut line 6 is not provided at the time of manufacture of the laminate for the wall surface sheet 1, and is laid out at a predetermined position in accordance with the printing register while rewinding the winding of the laminate for the wall sheet 1 in the bag making process. Alternatively, the opening cut line 6 may be provided on the base material layer 10 by pulsed laser irradiation or the like.

  Next, the usage method of the easy-open gusset bag A concerning this invention is demonstrated using FIG. 3, FIG. FIG. 3 is a perspective view showing a package in which the contents are stored in the easy-open gusset bag A of FIG. 1, and the contents are stored in the lower heat bonding portion 9 (see FIG. 1) that is not bonded, and the lower heat bonding portion. 9 shows a state of being thermally bonded and sealed. To open the package as shown in FIG. 3, when both sides of the V-shaped notch 7 of the easy-open gusset bag A ′ are picked with fingers and pulled to both sides (in the direction of the arrow in FIG. 4), as shown in FIG. The pair of wall sheets 1 and 1 are torn from the V-shaped notch 7 along the opening cut line 6 to reach the side edge thermal bonding portion 4, and then between the side sheet 2 and the wall sheet 1. It peels and the opening piece Q is formed, and the opening R is formed.

  With such a configuration, the opening R is beautiful and can be wide, and although not shown, the contents can be easily taken out. For example, when a large number of contents are stored, such as peanuts or potato chips, the opening piece Q can be opened to an arbitrary position to form an opening R according to the size of the contents. It is easy to take out a potato chip or the like, and after dispensing, the opening piece Q can be used as a lid to close the opening R by returning the opening piece Q to the original position (in the direction opposite to the arrow in FIG. 4). In addition, since the package packaged by the easy-open gusset bag A ′ has the side edge thermal bonding portion 4, rigidity is obtained in that portion, and when the side gusset portion G is set in the vertical direction, the downward side The edge heat bonding part 4 can be made self-supporting as a leg, and can be in a can-like form.

Next, the present invention will be described in more detail with reference to the following examples.
Using a biaxially stretched polyethylene terephthalate film (PET) with a single-sided corona treatment having a thickness of 12 μm on the base material layer of the wall sheet, a predetermined printing is performed on the corona-treated surface by a gravure printing method. -An aluminum-deposited biaxially-stretched polyethylene terephthalate film (VMPET) having a thickness of 12 μm is laminated on the intermediate layer via an isocyanate-based adhesive (AD) by a dry lamination method, and further polyethylene terephthalate of VMPET Laminate for wall sheet (PET / printing / AD / VMPET / AD) by dry lamination using linear low density polyethylene (LLDPE) with a thickness of 30 μm on the heat-adhesive resin layer via AD on the surface. / LLDPE).

  Sequentially via AD using 12 μm thick PET for the side sheet base layer, 12 μm thick VMPET for the intermediate layer, and 30 μm thick easily peelable thermal adhesive resin (EPR) for the thermal adhesive resin layer The laminate for side sheets (PET / AD / VMPET / AD / EPR) was prepared by laminating by the dry lamination method. In addition, brand CMPS013 by Tosero Co., Ltd. was used for EPR.

Slitting the above-mentioned wall sheet and side sheet laminate to a predetermined size and using a self-supporting bag making machine equipped with pulse oscillation type laser irradiation, synchronize with the printing of the wall sheet laminate at a predetermined position. The following easy-open gusset bag A was prepared by providing an opening score line on the base material layer.
Easy-open gusset bag dimensions: 150mm x 80mm
Side edge thermal bonding part seal width: 5mm
Upper thermal bonding part seal width: 5mm
Gusset part folding width: 20mm (development dimension: 40mm)
V-cut position: 25 mm from the edge of the side edge thermal bonding part
Opening cut line: A curve having the starting point as the V-cut position and passing through the intersection P and having the outer edge of the side edge thermal bonding portion as the end point e was provided as follows.
End point e: 15 mm from the upper edge of the wall sheet to the lower thermal bonding part side
Intersection P: 10 mm from the top edge of the wall sheet to the lower thermal bonding part side
Cut length: 1.5mm
Incision spacing: 0.5mm
The upper thermal bonding part was provided 3.0 mm away from the upper edge.

  Potato chips were enclosed in the easy-open gusseted bag A produced in Example 1, and heat-adhered at the lower heat-bonding part and sealed. Then, when opened from the V-shaped notch of the easy-open gusset bag A ′, the wall sheet can be torn along the opening cut line, and when the side edge thermal bonding part is reached, the side sheet and the wall sheet The contents could be easily removed by forming a beautiful opening. Moreover, when the opening piece was returned to the original position, the opening was closed.

It is a front view which shows one Embodiment of the easily openable gusset bag concerning this invention. It is the XX sectional view taken on the line of FIG. It is a perspective view which shows the package which accommodated the content in the easily openable gusset bag of FIG. It is a perspective view explaining the opening state of the easily openable gusset bag of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wall sheet 2 Side sheet 3 Side part 4 Side edge thermal bonding part 5 Upper thermal bonding part 6 Opening cut line 7 V-shaped notch 8 Cut 9 Lower thermal bonding part 10 Base material layer 20 Thermal adhesive resin layer A, A 'Easy-opening gusset bag e End point G Gusseted part P Intersection of opening cut line and ridge line folded inward on gusseted part Q Opening piece R Opening opening

Claims (3)

A pair of wall sheets and a pair of side sheets in which a base material layer and a thermoadhesive resin layer are laminated, and the thermoadhesive resin layer surfaces of the pair of wall sheets are arranged to face each other, and the pair of side surfaces The thermal adhesive resin layer of the sheet is folded inward at the center with the thermal adhesive resin layer as the outer surface, and inserted into the side portions on both sides between the wall sheet, respectively, and the thermal adhesive resin facing the wall sheet and the side sheet A four-corner seal gusset that is thermally bonded at the side edges of the layer surfaces to form side edge heat-bonded portions at the four corners, provided with a gusset portion, and an upper heat-bonded portion orthogonal to the side edge heat-bonded portion at the top A pair of the wall sheets is opened along the side edge thermal bonding portion extending obliquely downward from the upper ends of the pair of wall sheets between the gusset portions provided on the side portions. Provided on the base material layer, for opening from the upper edge Along the eyes, with tearing the pair of the wall surface sheet, easy-open gusset bag, characterized by opening from the gusset portions by peeling between said side sheet the wall sheet. The easy-open gusset bag according to claim 1, wherein an opening start means is provided at an end of the opening cut line at an upper end of the wall sheet. The easily openable gusseted bag according to claim 1 or 2, wherein the opening cut line comprises intermittent cuts penetrating only the base material layer of the wall sheet.

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