JP2008068889A - Easily openable pouch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily openable pouch in which the distal ends of front and rear films do not stick to each other right after the initial unsealing of the pouch, an opening is formed by easily pinching individual front and rear film distal end edges, and in addition, the front and rear film opening edges are recognized at a glance. <P>SOLUTION: The pouch is constituted by sealing the outer peripheral edges of at least two sets of front and rear laminated films. In the pouch, a cut is formed in the unsealing direction on the intermediate layer of one of the laminated films, and at the same time, a cut is formed in the unsealing direction of the intermediate layer of the other laminated film. The forming positions of the cuts are also different between the one laminated film and the other laminated film. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an easy-open pouch capable of forming an opening by pinching the front and back films and easily separating them immediately after the initial opening of the pouch without the front and back film edges sticking to each other.

  Conventionally, a package (pouch) in which contents such as retort food, detergent for refilling, aseptic packaged food, freshness-maintained packaged food, and pharmaceuticals are hermetically packaged is known. Such a pouch is configured to perform initial opening of the pouch by tearing off the film (cut piece) above the pouch in the horizontal direction with the notches formed on the left and right sides of the pouch as opening start points.

  However, immediately after the pouch is initially opened, the film edges of the front and back of the cut-out portions stick together in a state where the heights are aligned with each other, so that the front and back films are separated to form an opening. After rubbing the edge with the fingertip many times to form a slight gap at the edge of the film, it was necessary to carefully pinch the film with the fingertip from this gap and pull the front and back films apart.

  In particular, when the cut piece is cut using scissors and the initial opening of the pouch is performed, the film edges on the front and back sides are sharply cut off, making it easier for the film edges on the front and back sides to stick together, separating the front and back films to form an opening. Difficult to do.

  Therefore, in order to solve such problems, the present invention does not cause the film leading edges of the front and back to stick to each other immediately after the initial opening of the pouch. It is another object of the present invention to provide an easy-open pouch that can be formed at a glance and can be recognized at a glance.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is a pouch formed by sealing the outer peripheral edges of at least two pairs of front and back laminated films, and cuts in an opening direction in an intermediate layer of one of the laminated films. And forming a cut in the opening direction in the intermediate layer of the other laminated film, and the formation position of the cut differs between the one laminated film and the other laminated film. It is an easy-open pouch.

  In the invention according to claim 2, the cut-in formation positions formed in the two sets of the laminated films of the front and back are different between the one laminated film and the other laminated film, and are formed substantially parallel to each other. This is an easy-open pouch.

  According to a third aspect of the present invention, the cut positions formed in the two sets of front and back laminated films differ between the one laminated film and the other laminated film, and are formed so as to cross each other. This is an easy-open pouch.

  The invention according to claim 4 is characterized in that a plurality of the cuts formed in the two sets of laminated films of the front and back sides are respectively formed in the one laminated film and the other laminated film. It is an easy-open pouch.

  Further, in the invention according to claim 5, the notch forming position formed in the two sets of laminated films of the front and back sides is different between the one laminated film and the other laminated film, and the distance between the cuts is 0. An easy-open pouch characterized by being in the range of 1 mm to 1.5 mm.

Thus, according to the first aspect of the present invention, in the pouch formed by sealing the outer peripheral edges of at least two sets of the laminated films, a cut is formed in the intermediate layer of one of the laminated films in the opening direction. In addition, a cut is formed in the opening direction in the intermediate layer of the other laminated film, and the formation position of the cut differs between the one laminated film and the other laminated film. With the opening of the film, the film edge on the front and back forms a stepped portion, so that the film front edge on the front and back does not stick to each other.
Therefore, immediately after opening the pouch, it is possible to form the opening by pulling the front and back films apart while easily pinching the film edge of the stepped portion with the fingertip. Furthermore, since the film edges on the front and back immediately after opening the pouch form a step portion, it is possible to recognize the film edges on the front and back at a glance.

In the invention according to claim 2, the cut-in formation positions formed in the two sets of the laminated films of the front and back are different between the one laminated film and the other laminated film, and are formed substantially parallel to each other. Therefore, with the opening of the pouch, a substantially parallel stepped portion is formed between the front and back films.
Therefore, the front and back film leading edges do not stick to each other, and the front and back films can be easily pulled apart by placing a finger on the stepped portion.

  According to a third aspect of the present invention, the cut positions formed in the two sets of front and back laminated films differ between the one laminated film and the other laminated film, and are formed so as to cross each other. Therefore, when the pouch is opened, a step portion where the front and back film leading edges intersect is generated, so that the front and back film leading edges do not stick to each other. Thus, the front and back film leading edges do not stick to each other, and the front and back films can be easily pulled apart by placing a finger on the stepped portion.

  The invention according to claim 4 is characterized in that a plurality of the cuts formed in the two sets of laminated films of the front and back sides are respectively formed in the one laminated film and the other laminated film. The cut piece of the pouch can be easily torn along the opening direction, and there is an effect of preventing the tear from being displaced during the process.

  Further, in the invention according to claim 5, the notch forming position formed in the two sets of laminated films of the front and back sides is different between the one laminated film and the other laminated film, and the distance between the cuts is 0. Since it is within the range of 1 mm to 1.5 mm, the stepped portion of the front and back films formed immediately after the opening of the pouch is well-fingered, and there is an effect that the opening property is improved.

  As an example of the universal pouch 10 of the present invention, as shown in FIG. 1 (a), the notch 6 formed on the left and right seal portions 2 of the pouch 10 formed by heat-sealing the outer periphery of the upper, lower, left and right films is the starting point. Further, the pouch 10 is initially opened by cutting the film in the horizontal direction as shown in FIG.

  In particular, from two notches 7 and 8 formed between the left and right notches 6 having different heights, immediately after the initial opening of the pouch, a film edge 7 ′ by the notch 7 and a film edge 8 ′ by the notch 8 It is possible to form stepped portions D having different heights.

  Therefore, after the initial opening of the pouch 10, the front and back film leading edges 7 ′ and 8 ′ do not stick to each other at the same height, and the front and back film leading edges 7 ′ and 8 ′ In order to form the stepped portion D, as shown in FIG. 2, when the protruding film end edge 8 'is pinched with the fingertip of one hand and twisted outwardly, a gap S is formed between the front and back films. Will be. Therefore, it is possible to easily pinch the film leading edge 7 'by inserting the fingertip of the other hand into the gap S, and pulling the film leading edge 7', 8 'on the front and back sides with the fingertips and pulling them apart is easy. It is possible to form a pouch opening. Furthermore, it is possible to recognize the front and back film edges 7 ′ and 8 ′ at a glance by the step portion D formed by the front and back films.

  Specifically, the easy-open pouch 10 (pouch 10) of the present invention, as shown in FIG. 3 (a), contains an unsealed portion in which the content is previously filled in a central portion of the pouch 10 by a predetermined method. A four-side seal pouch 10 is formed by heat sealing the upper seal portion 1, the left and right seal portions 2, and the lower seal portion 3 on the outer peripheral portion of the housing portion 4. Such a pouch 10 is not limited to a four-sided seal type pouch 10, but is limited in the type and shape of the pouch as long as the pouch 10 is formed by sealing the outer periphery of a film, such as a stand pouch, a gusset bag, or a pillow bag. Is not to be done.

  A notch 6 is formed above the left and right seal portions 2 as an opening start point when the housing portion 4 is cut across the horizontal direction, and the notch 6 is the starting point when the pouch 10 is initially opened. The pouch 10 is initially opened by cutting the upper film (cut piece 5) including the upper seal portion 1.

  In the intermediate layer of the laminated film F between the left and right notches 6, two cuts 7 and 8 having different heights are formed along the opening direction. As a result, the laminated film F (film F) is easily torn along the notches 7 and 8 from the notch 6 portion, and the heights of the film edges 7 'and 8' on the front and back sides are different immediately after opening the pouch. Part D is formed.

  In particular, the incisions 7 and 8 are, as shown in the side sectional view of FIG. 3 (b), two sets of laminated films F and F, each consisting of three layers on one side (surface layer a, intermediate layer b, adhesive layer c). 'Is formed in each intermediate layer b. Accordingly, since the cuts 7 and 8 are not formed in the surface layer a of the laminated films F and F ′, the gas barrier properties of the laminated films F and F ′ can be improved without reducing the strength of the laminated films F and F ′. Only the openability can be improved without lowering.

For this reason, it is also suitable for pouches that require moisture resistance and gas barrier properties. For example, when a pouch having the structure of OPP / DL / CPP is used, it is suitable for soft packaging of snacks and the like, and PET / DL / When a pouch having a configuration of AL / DL / ON / DL / CPP is used, it can be suitably used as a retort pouch for retort foods or a pouch for refillable liquid detergents. In addition, it is preferable to form the cuts 7 and 8 in the underlined film in the above configuration.

  In addition, the notches 7 and 8 having different heights formed in the two sets of laminated films F and F ′ of the front and back of the easy-open pouch 10 of the present invention are not limited to being formed substantially parallel to each other, for example, As shown in FIG. 4A, they may be formed so as to intersect each other. In this case, the laminated film F (film F) is easily torn from the notch 6 portion along the notches 7 and 8, and as shown in FIG. 4B, the film edges 7 ′ and 8 ′ immediately after the pouch is opened. Are different in height, and a stepped portion D having a shape in which the film end edges 7 ′ and 8 ′ intersect is formed.

  Therefore, immediately after the initial opening of the pouch 10, the leading edges of the film on the front and back sides do not stick to each other, and an intersecting step portion D is formed. Therefore, the film in this portion is easily pinched and separated to form an opening. It is possible. Furthermore, by forming a stepped portion D where the front and back films intersect, it is possible to recognize the front and back film edges 7 'and 8' at a glance.

  As described above, the easy-open pouch of the present invention forms a cut in the opening direction in the intermediate layer of one of the laminated films, and forms a cut in the opening direction in the intermediate layer of the other laminated film, Due to the simple structure in which the cut formation position is different between one laminated film and the other laminated film, a step is created between the front and back films when the pouch is opened so that the front and back film tips stick to each other. There is nothing. Therefore, after the initial opening of the pouch, the front and back films can be easily pinched and separated, and further, there is an effect that the front and back film edges after opening the pouch can be recognized at a glance. Therefore, it is possible to provide an easy-open pouch that can be opened smoothly and easily.

  A plurality of the cuts 7 and 8 may be formed in the intermediate layer of each laminated film. For example, as shown in FIG. 5B, two cuts 7a and 7b are formed in one laminated film F. 7a and 7b may be formed, and two cuts 8a and 8b of the cut 8a and the cut 8b may be formed in the other laminated film F. Further, as shown in FIG. 5 (d), a plurality of cuts 7a, 7b and 8a, 8b may be formed and these may be crossed with each other.

In the above example, the case where the two cuts 7a and 7b are formed has been described. However, three or more rows of cuts may be formed. By providing a plurality of cuts, it is possible to tear easily along the opening direction, and there is an effect of preventing tearing from being deviated halfway.

  The distance between the notches 7 and 8 formed in the two sets of front and back laminated films F and F ′ is preferably 0.1 mm to 3.0 mm, more preferably 0.5 mm to 1.5 mm apart. It is preferable to form upper and lower cuts, and when forming the opening of the pouch, there is an effect that the front edge of the film on the front and back sides is shifted and the finger catching is improved and the opening property is improved. On the other hand, if the distance between the notches 7 and 8 exceeds 4 mm, it is difficult to cut the film when the pouch 10 is initially opened.

  Further, as shown in FIGS. 5C and 5D, it is not always necessary to form the notch. If the pouch can be suitably opened, in addition to the method of providing the notch, the notch is formed by laser light irradiation or the like. 7 or 8 or a method of laminating a uniaxially stretched film on an intermediate layer of a laminated film of a pouch and forming cuts 7 and 8 (in this case, the stretch direction of the uniaxially stretched film is the opening direction of the bag) The method for forming the notches 7 and 8 is not limited. Further, the shape of the notch is not particularly limited, such as a V-notch as shown in FIG. 5A or a U-notch as shown in FIG. 5B, and an acute angle portion in the cutting direction. Any shape can be used.

  The cuts 7 and 8 are not limited to linear cuts, and may be perforations formed with cuts intermittently, and if the laminated films F and F ′ can be suitably opened along the opening direction, The types and shapes of the cuts 7 and 8 are not limited.

  The easy-open pouch 10 of the present invention may be a stand-up pouch or a pillow type pouch 10, and the shape of the pouch is not limited as long as the pouch 10 is formed by sealing the outer periphery of the film. As an example of a suitable stand pouch 10, as shown in FIGS. 5 (a), 5 (b), and 5 (c), a 3-piece stand pouch having a front surface, a back surface, and a folded bottom surface, as shown in FIG. As shown, a stand pouch 10 having a shape in which the front surface, the back surface, and the folded bottom surface are formed of a single sheet and the bottom portion is trimmed obliquely can be exemplified.

  The film used for the pouch 10 of the present invention is a laminated film mainly composed of a plastic film. For example, a conventionally known laminated film used for various food pouches containing liquid can be used. There is no particular limitation. The configuration of the laminated film can be appropriately selected depending on the type of liquid food to be filled, the heating conditions applied at the time of pressure heat sterilization after filling, and the like.

  As the intermediate layer b of the laminated films F and F ′, films such as biaxially stretched nylon, biaxially stretched polyethylene terephthalate, biaxially stretched polypropylene, and ethylene-vinyl alcohol copolymer can be used. As the intermediate layer b, the above film may be used as one layer, or two or more layers may be laminated. Moreover, you may form a laminated body with aluminum foil. When two or more films are laminated and used as the intermediate layer b, the notch 7 may be provided only in the strong layer among the layers to be laminated, or the notch 7 may be provided in both layers. .

  The surface layer a of the laminated films F and F ′ is a biaxially stretched plastic film such as biaxially stretched polypropylene, biaxially stretched polyethylene terephthalate, or biaxially stretched nylon, or a gas such as vinylidene chloride resin for those films. A film coated with a barrier resin can be used.

  In addition, the adhesive layer c of the laminated films F and F ′ includes heat such as low / medium / high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. An adhesive resin can be used.

  In order to laminate the surface layer a, the intermediate layer b, and the adhesive layer c of the laminated films F and F ′, respectively, an adhesive can be used. As an example, dry lamination using a urethane-based adhesive is possible. It is possible to carry out by the method of laminating by the above or the method of laminating by melt extrusion lamination such as polyethylene resin. In particular, laminating with the dry lamination is preferable because tearability is improved.

As an example of the laminated structure of the laminated films F and F ′,
(1) Biaxially stretched polypropylene (OPP) / dry lamination (DL) / unstretched polypropylene (CPP)
(2) Biaxially stretched polyethylene terephthalate (PET) / extrusion lamination (EC) / CPP
(3) PET / DL / aluminum foil (AL) / DL / 2 biaxially stretched nylon (ON) / CPP
(4) PET / DL / AL / DL / ON / CPP
(5) PET / DL / AL / DL / ON / Linear low density polyethylene (LLDPE)
(6) PET / DL / AL / DL / PET / LLDPE
(7) PET / DL / ON / DL / CPP
(8) PET / DL / ON / DL / LLDPE and the like, and it is more preferable to provide the cuts 7 and 8 in the underlined film.

It is a figure which shows the easy-open pouch of this invention. (A) It is a figure which shows before the initial opening of a pouch. (B) It is a figure which shows immediately after the initial opening of a pouch. It is explanatory drawing which shows a mode that the easy-open pouch of this invention is opened. It is a figure which shows the easy-open pouch of this invention. (A) It is a front view of a pouch. (B) It is a partially cutaway view which shows the XX cross section of a pouch. It is a figure which shows another example of the easy-open pouch of this invention. (A) It is a front view which shows the initial stage opening of a pouch. (B) It is a perspective view which shows immediately after the initial opening of a pouch. (A) (b) (c) (d) It is a figure which shows another example of the easy-open pouch of this invention.

Explanation of symbols

1 Upper seal part 2 Left and right seal parts 3 Lower seal part 4 Storage part (unsealed part)
5 Cut piece 6 Notch 7 Cut 7 'Film edge 8 Cut 8' Film edge 10 Easy-open pouch (pouch)
D Stepped portion F, F ′ Laminated film a Surface layer b Intermediate layer c Adhesive layer

Claims (5)

In a pouch formed by sealing the outer peripheral edge of at least two sets of front and back laminated films,
A cut is formed in the opening direction in the intermediate layer of the one laminated film, a cut is formed in the opening direction in the intermediate layer of the other laminated film, and the formation position of the cut is the one laminated film And the other laminated film differ in easy-open pouch.   The formation position of the cut formed in the two laminated films of the front and back surfaces is different between the one laminated film and the other laminated film, and is formed substantially parallel to each other. The easy-open pouch described.   The formation position of the cut formed in the laminated film of two sets of front and back is different between the one laminated film and the other laminated film, and is formed so as to intersect with each other. The easy-open pouch described.   4. The easy-open pouch according to claim 1, wherein a plurality of the cuts formed in the two laminated films are formed in the one laminated film and the other laminated film, respectively. 5. .   The formation position of the cut formed on the two laminated films of the front and back surfaces is different between the one laminated film and the other laminated film, and the distance between the cuts is within a range of 0.1 mm to 1.5 mm. The easy-open pouch according to claim 1, wherein the easy-open pouch is provided.

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