JP2007204057A - Easily openable bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily openable bag for which tearing can easily be started from a predetermined location of the peripheral edge sealed section of the bag, and by which a wrong unsealing or the cutting of a finger does not occur. <P>SOLUTION: This easily openable bag consists of a laminate having at least a base material layer and a heat-adhesive resin layer which is formed on the internal surface, has the peripheral edge sealed section for which the heat-adhesive resin layers of the laminate are made to face each other, and the peripheral edges are heat-adhered, and is equipped with a cutoff planned line. In a region of the end section of the cutoff planned line in the peripheral edge sealed section of the bag, a scar group which consists of pierced holes and penetrates the peripheral edge sealed section is formed. In a region of the end section of the cutoff planned line in the peripheral edge sealed section of the bag, a cut is formed on at least one laminate of the laminates which form the front surface and the rear surface for the easily openable bag. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an easy-open bag that can easily start tearing.

  Conventionally, in order to make it easier to start tearing the bag along the cut line 3, as shown in FIG. 4, a triangular cut 6 a ( V-notch), U-shaped notch 6b (U-notch), and turtle-shaped notch 6c (UV notch) are usually provided. However, when the above-mentioned cut is formed in the peripheral seal portion of the bag, when the laminated body constituting the bag is thick and rigid, when handling the bag, the fingers are cut at the corners of the cut, etc. Problems may occur. In addition, for example, a large number of scars are densely provided substantially on the edge line of the seal part of the bag (see, for example, Patent Document 1), and a large number of positions are within 3 mm from the outer edge of the seal part of the bag. There are known ones in which a through-hole having no omission is formed (for example, see Patent Document 2). However, in the above bag, since the bag can be easily started to tear from any position of the seal portion of the bag, there is a drawback that the bag is torn from a position other than the position to be torn.

Furthermore, an easy-open bag has been proposed in which a scar group consisting of pierced holes is formed in the region of the end portion of the tear line in the peripheral seal portion of the bag (see, for example, Patent Document 3). According to Patent Document 3, although the above-mentioned drawbacks have been improved, the tear start function is further improved when the shape of the scar group becomes a cut shape, but the peripheral seal portion is affected by handling of the packaged product and impact during transportation. There is a risk that the scars straddling the outer edge will spread and the fingers may be cut at the widened scar part when handling the bag in the same way as an erroneous opening or V-notch, U-notch, UV notch or the like.
Japanese Examined Patent Publication No. 61-39228 JP 61-60469 A Japanese Patent Laid-Open No. 10-119984

  An object of the present invention is to provide an easy-open bag that can be easily started from a predetermined location on the peripheral seal portion of the bag and that does not accidentally open or cut fingers.

  As a result of research, the present inventor has found that when the cut scar group extends over the outer edge of the peripheral seal portion of the bag, the scar penetrates the peripheral seal portion. Pay attention to the phenomenon that spreads, and in the region of the edge of the line to be cut in the peripheral seal portion of the bag, a cut scar is applied to at least one of the stacks of the front and back layers, and the cut scar The problem was solved by preventing the penetrating through the peripheral seal part. That is, the present invention according to claim 1 is composed of a laminate having at least a base material layer and a heat-adhesive resin layer formed on the inner surface, and the peripheral edges of the laminate are opposed to each other. A bag having a thermal seal bonded peripheral seal portion and provided with a planned cut line, and a group of scars penetrating the peripheral seal portion formed by a piercing hole in an end region of the planned cut line in the peripheral seal portion of the bag. It is formed, and a cut is formed in at least one of the laminates forming the front surface and the back surface in the region of the end portion of the planned cut line in the peripheral seal portion of the bag. Is.

  The present invention comprises a laminate having at least a base material layer and a heat-adhesive resin layer formed on the inner surface, and has a peripheral seal part in which the thermal adhesive resin layers of the laminate are opposed to each other and the periphery is thermally bonded. , A bag having a planned cut line, wherein a group of scars penetrating the peripheral seal portion formed of a piercing hole is formed in an end region of the planned cut line in the peripheral seal portion of the bag, and the peripheral edge of the bag Since it is an easy-open bag in which a cut is formed in at least one of the laminates forming the front surface and the back surface in the region of the end portion of the planned cut line in the seal portion, the scars at the end portion of the cut line It is possible to easily start tearing from the point of opening. In addition, since the cut scar formed in the peripheral seal part is applied to the laminate on the front surface and / or the back surface before the peripheral seal is performed, it does not penetrate the peripheral seal part. There is an excellent effect that it is possible to provide an easy-opening bag that does not cause the opening-like scars straddling to spread by external force and that does not accidentally open or cut fingers.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows one embodiment of the easy-open bag of the present invention, (A) is a plan view, (B) is a cross-sectional view taken along line YY in (A), and FIG. 2 is an easy-open bag of the present invention. (A) which shows other embodiment is a top view, (b) is YY sectional drawing in (b), FIG. 3 is a partial top view which shows the shape of the scar group formed in the easy-open bag of this invention, FIG. 4 is a partial plan view showing an opening end of a conventional bag, 1 is a peripheral seal portion, 2 is a scar group, 3 is a cut line, 4 is a puncture hole, 5 and 5 'are cuts, 6a, 6b, 6c is a notch, 10 and 10 'are base material layers, 11 and 11' are intermediate layers, 12 and 12 'are thermoadhesive resin layers, F is a laminate on the front surface, and B is a laminate on the back surface.

  One embodiment of the easy-open bag of the present invention comprises a laminate in which a base material layer 10, an intermediate layer 11, and a heat-adhesive resin layer 12 are laminated, as shown in FIGS. The three-side sealed bag is formed by the peripheral seal portion 1 with the heat-adhesive resin layer 12 on the inside, and is cut in parallel to the upper edge at a position below the upper edge at a predetermined distance from the upper edge. The planned line 3 is provided, and a scar group 2 including a plurality of fine piercing holes 4 and cuts 5 is formed in the region of the peripheral seal portion 1 at both ends of the planned cut line 3. As shown in FIG. 1 (b), the cross-sectional configuration of the portion where the scar group 2 at the edge of the peripheral seal portion 1 at both ends of the planned cut line 3 is the same as that of the base material layer 10 in the peripheral seal portion 1. Laminate B on the back surface comprising thermal adhesive resin layer 12, base material layer 10 ', intermediate layer 11' and thermal adhesive resin layer 12 'of laminate F on the front surface comprising intermediate layer 11 and thermal adhesive resin layer 12 In the state where the heat-adhesive resin layer 12 ′ is sealed by heat bonding, a number of fine piercing holes 4 penetrating the laminate are formed, and the laminate F on the front surface and the laminate B on the back surface are respectively provided. In the state where at least one or more incisions 5, 5 ′ penetrating the laminate are sealed by thermal bonding, the laminate F on the front surface and the laminate B on the back surface are overlaid and heat-sealed. Each incision 5, 5 'is in a state shifted from each other and penetrates the bag. No. After the bag is filled with the contents, the bag is sealed by thermal bonding along the upper edge at the upper portion of the cut line 3. When opening, the piercing hole 4 or the cuts 5 and 5 'existing on the outer edge of the peripheral seal portion 1 are triggered, and tearing can be easily started from the portion where the scar group 2 is formed. Due to the presence of 4 and cuts 5, 5 ', the bag can be torn and opened with less force. Here, an example in which cuts 5, 5 ′ are made on the front surface laminate F and the back surface laminate B is not limited to this, and any of the front surface laminate F and the back surface laminate B What is necessary is just to be given to one of these laminated bodies. Moreover, the laminated body F on the front surface and the laminated body B on the back surface are the same laminated body, and are given symbols for explanation.

  Other embodiments of the easy-open bag of the present invention are, as shown in FIGS. 2 (a) and 2 (b), a base material layer 10, 10 ′, an intermediate layer 11, 11 ′, and a thermoadhesive resin layer 12, 12. Is a three-side sealed bag formed by a peripheral seal portion 1 and laminated with the heat-adhesive resin layer 12 on the inside, the upper portion of the bag having a predetermined distance from the upper edge. A cut line 3 is provided at a lower position parallel to the upper edge, and a linear cut line 13 is formed across the entire width of the bag at a position corresponding to the cut line 3 in the intermediate layer 11, 11 ′ of the laminate. 13 'is formed, and a scar group 2 including a plurality of fine piercing holes 4 and cuts 5 is formed in regions in the peripheral seal portion 1 at both ends of the linear cuts 13 and 13'. The linear cuts 13 and 13 'in the present embodiment may be completely cut or may be perforated.

  As shown in FIG. 2B, the cross-sectional configuration of the portion where the scar group 2 is formed at the edge of the peripheral seal portion 1 at both ends of the planned cut line 3 is the base material layer 10 in the peripheral seal portion 1. 10 ′, the intermediate layers 11 and 11 ′, and the heat-adhesive resin layers 12 and 12 ′, and the intermediate layers 11 and 11 ′ of the laminate B are linear at positions corresponding to the planned cut lines 3. Incisions 13, 13 'are provided, and the heat-adhesive resin layer 12 of the laminate F on the front surface and the heat-adhesive resin layer 12' of the laminate B on the back surface are overlaid and sealed by heat adhesion, A large number of fine piercing holes 4 penetrating the laminated body are formed, and incisions 5, 5 ′ penetrating each laminated body are sealed by thermal bonding in the laminated body F on the front surface and the laminated body B on the back surface. At least one front is formed on the front, the laminate F on the front and the back In a state where the laminate B was heat-sealed superposed, a state in which the cuts 5,5 'are mutually offset, does not penetrate the bag. After filling the bag with the contents, the bag is sealed by thermal bonding along the upper edge at the top of the cut line 3. At the time of opening, the puncture hole 4 or the cuts 5 and 5 ′ existing on the outer edge of the peripheral seal portion 1 became a trigger, and tearing was easily started from the portion where the scar group 2 was formed, and tearing was started. Thereafter, the bag can be easily torn and opened linearly along the linear cuts 13, 13 'formed in the intermediate layer 11, 11'.

  The scar group 2 composed of a plurality of fine piercing holes 4 and at least one or more cuts 5, 5 'will be described in more detail. A plurality of the puncture holes 4 may be provided densely along the edge of the peripheral seal portion 1 at both ends of the planned cut line 3, but it is preferably formed in a shape as shown in FIG. 3A is formed in a triangular shape, FIG. 3B is formed in a U-shape, and FIG. 3C is formed in a turtle shell shape. The number of the piercing holes 4 is arbitrary, and it may be formed densely in a predetermined region at both ends of the planned cutting line 3. The size of the puncture holes 4 is preferably 0.5 to 2.0 mm and provided at intervals of 0.5 to 2.0 mm. The shape of the puncture hole 4 may be circular or elliptical. One or more cut lines 5, 5 'may be provided, but a plurality of cut lines are preferably formed. The direction of the cuts 5 and 5 ′ is preferably made parallel to the planned cut line 3, and the cut ends are formed so as to straddle the outer edge of the peripheral seal portion of the bag. The length of the cuts 5 and 5 'is preferably 0.5 to 2.0 mm, and more preferably 0.5 to 1.0 mm. By forming the scar group 2 in the predetermined region at both ends of the planned cut line 3 in this way, the laminate constituting the bag can be easily started to tear from the portion where the scar group 2 is formed. It can be easily opened by tearing the bag from the part.

  The formation of the cut lines 5 and 5 ′ is performed by using a laminate in which the base material layer 10 (10 ′), the intermediate layer 11 (11 ′), and the thermal adhesive resin layer 12 (12 ′) are laminated. When the bag is made with the peripheral seal part 1 formed by thermal bonding, the thermal adhesive resin layer surfaces 12 and 12 'of the body are opposed to each other, and before the peripheral seal part is provided by thermal bonding, the cuts 5, 5 By using a piercing tool in which one or more cutting blades forming a 'are embedded in a predetermined shape, each of them is pierced at a predetermined position at both ends of the cut line 3 of the front surface laminate F and the back surface laminate B. Cuts 5, 5 'are formed. The piercing hole 4 is formed by stacking the heat-adhesive resin layers 12 and 12 'of the front-side laminate F and the back-side laminate B, and manufacturing a bag with the peripheral seal portion 1 formed by thermal bonding. Then, after providing the peripheral seal portion 1 by thermal bonding, use a piercing tool in which a plurality of needles are embedded in the shape of the scar group 2 to be formed, and pierce a predetermined portion at both ends of the scheduled cut line 3 of the bag. Thus, the piercing hole 4 is formed. As described above, the scar group 2 including the puncture hole 4 and the cut line 5 can be formed in the bag making process, so that an easy-open bag can be produced very efficiently without requiring a special process. Can do. Since the scar group 2 is formed in a small area, the puncture tool for forming the scar group 2 can be easily manufactured because a plurality of needles can be embedded in a small area.

  As the base material layer 10 used in the laminate constituting the easy-open bag of the present invention, a biaxially stretched film such as a biaxially stretched polypropylene film, a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film can be suitably used. . As the intermediate layer 11, in the above-described biaxially stretched film, or in an application that requires gas barrier properties, a film obtained by coating vinylidene chloride resin on the film, and metal deposition and metal oxide deposition were performed on these films. A film, an ethylene vinyl alcohol copolymer, a polyvinyl alcohol film, or the like can be used. Examples of the heat-adhesive resin layer 12 include low-density polyethylene, medium-density polyethylene, linear low-density polyethylene, ethylene-α olefin copolymer polymerized using a single site catalyst, ethylene-vinyl acetate copolymer, and polypropylene. A resin or a film obtained by performing metal deposition on those films can be used. In one embodiment, a laminate having a three-layer structure in which the base material layer 10, the intermediate layer 11, and the thermoadhesive resin layer 12 are laminated is illustrated. A plurality of intermediate layers can be laminated between the material layer and the heat-adhesive resin layer to form four or more layers, and the chemical protection function required for the packaged contents (gas barrier properties, moisture permeability, etc.) The laminated structure may be selected in consideration of the physical protection function (tensile strength, impact strength, heat seal strength, etc.) and economic efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an easy-open bag of the present invention, in which (A) is a plan view and (B) is a YY sectional view in (A). The other embodiment of the easy-open bag of this invention is shown, (A) is a top view, (B) is YY sectional drawing in (A). It is a fragmentary top view which shows the shape of the scar group formed in the easy-open bag of this invention. It is a fragmentary top view which shows the opening end of the conventional bag.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Perimeter seal | sticker part 2 Scar mark group 3 Cut planned line 4 Puncture hole 5, 5 'Cut 6a, 6b, 6c Cut 10, 10' Base material layer 11, 11 'Intermediate layer 12, 12' Thermal adhesive resin layer 13, 13 'linear cut line F laminated body on the surface B laminated body on the back surface

Claims (2)

A laminate having at least a base material layer and a heat-adhesive resin layer formed on the inner surface, and having a peripheral seal portion in which the thermal adhesive resin layers of the laminate are opposed to each other and the periphery is thermally bonded, A bag provided with a planned line, wherein a group of scars penetrating the peripheral seal part formed of a piercing hole is formed in an end region of the planned cut line in the peripheral seal part of the bag, and the peripheral seal part of the bag An easily openable bag, wherein a cut is formed in at least one of the laminates forming the front surface and the back surface in a region of an end portion of the planned cut line. An intermediate layer is laminated via an adhesive layer between the base material layer and the thermal adhesive resin layer, and a cut corresponding to the planned cut line is formed in the intermediate layer. The easy-open bag according to claim 1.

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