JP5003255B2 - Easy-open packaging bag - Google Patents

Description

  The present invention relates to an easy-open packaging bag having a back-bonded heat-bonded portion such as a pillow type or a gusset type. The present invention relates to an easily openable packaging bag that can be opened along a wide opening and can be used as a tray container.

  Conventionally, pillow-type and gusset-type packaging bags are widely used as packaging bags for storing snacks, hail, biscuits, snacks, and the like. These packaging bags are packaged and distributed as products after containing their contents. However, external forces such as vibrations and shocks during distribution or external forces applied during product handling are loaded on the packaging bags. In order to prevent the contents of the packaging bag from being deteriorated due to breakage of the packaging bag, pinholes, or the like, a laminated body in which a plastic film or the like is laminated to give strength is used.

  However, these pillow-type and gusset-type packaging bags use a layered product with strength, so it is difficult to open by hand. It is difficult, and it is necessary to cut off between one end thermal bonding portion and the contents using a tool such as scissors at the time of opening. For this purpose, a V-shaped notch is provided in the end thermal bonding portion so that the packaging bag can be torn and opened (vertical opening) in parallel with the back-bonded thermal bonding portion. In addition, a rough surface for opening made by pressing the abrasive grain surface is provided on the surface side plastic film located at the folded part where the fold line is directed to the opening direction of the packaging bag, and orthogonal to the back-bonded thermal adhesive part And the packaging bag which tears a packaging bag and opens (horizontal opening) is known (for example, refer patent document 1). In addition, at least one of the left and right folded portions of the packaging bag is provided with a first opening rough surface portion with an interval in the vertical (longitudinal) direction of the bag, and for the first opening of the back-bonded thermal bonding portion of the bag There has been proposed a packaging bag that can be opened a plurality of times by providing a second opening rough surface portion having a length equal to that at a position corresponding to the rough surface portion (see, for example, Patent Document 2).

However, in the above-described method for opening a pillow-type packaging bag or gusset bag, the former vertical opening and the latter horizontal opening are both torn open both sides of the packaging bag and take out the contained contents. There is a problem that if the packaging bag is placed sideways after taking out a part of the contents, the contents spill out of the packaging bag, which is not preferable in terms of hygiene. In addition, for example, in the case of a gusset bag containing potato chips etc., when the potato chips etc. are consumed and reduced, it must be taken out as if looking inside, inconvenient that it is difficult to take out, in order to put hands deeply In addition to the fingers that pick potato chips, there is a problem of soiling the back and palm of the hand. Since Patent Document 2 can be opened multiple times, the back and palm of the hand are not soiled even if the content is reduced, but it is troublesome because it requires multiple opening.
Japanese Utility Model Sho 63-147451 JP 2000-103437 A

  Therefore, the present invention solves the above problems, starts tearing the laminate from the back-bonded heat-bonded portion, and can open along a straight opening cut line to form a wide opening, and the opened It is to provide an easy-open packaging bag that can be used as a tray container.

In order to achieve the above object, the present invention according to claim 1, wherein the thermal adhesive resin layer comprises a rectangular laminate in which a base material layer, an intermediate layer, and a thermal adhesive resin layer are laminated. Folded to be inside and thermally bonded so that the ends protrude to the outside to provide a back-bonded heat bonded portion to form a cylindrical body, and the opening end of the cylindrical body is thermally bonded to the end A packaging bag provided with a part heat bonding part and provided with an opening start means on the back-bonded heat bonding part, wherein the opening start means is provided in the vicinity of one end heat bonding part between the end heat bonding parts. In addition, one continuous linear opening break that penetrates only the intermediate layer in parallel with the back-bonded heat-bonding portion at positions away from the back-bonded heat-bonding portion on both sides of the back-bonded heat-bonding portion. It is an easy-open packaging bag characterized by being formed.

Further, in the present invention according to claim 2, a rectangular laminate in which a base material layer and a heat-adhesive resin layer are laminated is bent so that the heat-adhesive resin layer is on the inside, and the end portions are Heat-bonded so as to protrude outward to provide a back-bonded heat-bonded portion to form a cylindrical body, and heat-bonds the open end of the tube-shaped body to provide an end heat-bonded portion to the back-bonded heat-bonded portion. A packaging bag provided with an opening start means, wherein the opening start means is provided in the vicinity of one end thermal bonding portion between the end thermal bonding portions, and the back is provided on both sides sandwiching the back-bonding thermal bonding portion. An easy opening characterized in that a single continuous linear opening cut is formed at a position distant from the pasting heat-bonding portion, parallel to the back-bonding heat-bonding portion and penetrating only the heat-adhesive resin layer. Openable packaging bag.

The present invention described in claim 3 is the easy-open packaging bag according to claim 1 or 2, wherein the packaging bag is a pillow type packaging bag .

In the present invention of claim 1, the intermediate layer parallel to the back bonding heat seal portion at a position away from the back lined heat-bonding part in both sides of the back lined thermal bonding unit, according to claim 2 in the present invention By forming a continuous straight opening for opening in the heat- adhesive resin layer, the laminate can be easily torn from the opening start means provided in the back-bonded heat-bonding part, and further tearing proceeds. When the opening break is reached, it can be torn open along the opening break, a wide opening is formed, and the opened packaging bag can be used as a tray container, which is hygienic and easy to contents There is an effect that it can be taken out. Furthermore, since the wide opening is formed, the contents can be easily taken out to the end without soiling the back of the hand or palm.

  Moreover, a wider opening can be formed by providing the opening start means in the back-bonded thermal bonding portion in the vicinity of one end thermal bonding portion between the end thermal bonding portions.

Embodiments of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a perspective view showing a first embodiment of an easy-open packaging bag according to the present invention, FIG. 2 is a sectional view of a laminate of the easy-open packaging bag of the first embodiment, and FIG. Fig. 4 is an enlarged cross-sectional view showing a cut line for opening in a cross-sectional view taken along line XX of Fig. 1, Fig. 4 is a perspective view for explaining an open state of the easy-open gusset bag of Fig. 1, and Fig. 5 is a second embodiment. It is an expanded sectional view which shows the site | part corresponded to FIG. In the figure, 1 is an easy-open packaging bag of the first embodiment, 1 ′ is a tray container formed by opening the easy-open packaging bag of the first embodiment, 2 is a back-bonded thermal bonding portion, and 3 is an end. 4 is a V-shaped notch as an opening start means, 5 is a cut for opening, 6 is a bent portion, 7 is an opening piece, 8 is an opening, 10 and 10 ′ are laminates, 11 ′ represents a base material layer, 12 represents an intermediate layer, and 13 and 13 ′ represent thermal adhesive resin layers.

  A first embodiment of an easy-open packaging bag according to the present invention is as shown in FIGS. FIG. 1 is a perspective view showing a first embodiment of an easy-open packaging bag according to the present invention as seen from the back-attached heat-bonding portion side, and FIG. 2 is a cross-sectional view of a laminate of the easy-open packaging bag. FIG. 3 is an enlarged sectional view showing only the laminated body on the side of the opening cut in the sectional view taken along the line XX of FIG. As shown in FIG. 2, the easy-open packaging bag 1 according to the present invention comprises a laminate 10 in which a base material layer 11, an intermediate layer 12, and a heat-adhesive resin layer 13 are sequentially laminated. The easy-open packaging bag 1 is formed by bending so that the heat-adhesive resin layer 13 of the laminate 10 is on the inside, and is thermally bonded so that the ends protrude outward, and the back-bonded heat-bonding portion 2 is provided. A pillow-type packaging bag in which a cylindrical body is formed, and an opening end of the cylindrical body is thermally bonded to provide an end thermal bonding portion 3 and a V-shaped notch 4 is provided on the back-bonding thermal bonding portion 2 as opening opening means. is there.

  On both sides of the back-bonded thermal bonding portion 2, linear opening cuts 5 are formed in parallel with the back-bonded thermal bonding portion 2 and continuous with the intermediate layer 12. The interval between the two unsealing cuts 5 sandwiching the back-bonded heat-bonding portion 2 is arbitrarily set between the back-bonded heat-bonding portion 2 and the folding portion 6 of the easy-open packaging bag 1 depending on the size of the opening to be formed. Can be set. A V-shaped notch 4 as an opening start means is provided at the edge of the back-bonded thermal bonding portion 2 in the vicinity of one end thermal bonding portion 3 between the end thermal bonding portions 3 and 3. The V-shaped notch 4 can be arbitrarily provided as long as it is between the end thermal bonding portions 3 and 3, but at least in FIG. It is preferable to provide it in the vicinity of the end thermal bonding portion 3 at a position where a large opening can be formed and the contents can be easily taken out. As the opening start means, an I-shaped notch, a U-shaped notch, a turtle-shaped notch or the like can be used in addition to the V-shaped notch. Moreover, a scar group may be provided on the outer edge opposite to the inner edge of the back-bonded thermal bonding portion 2 so that opening can be started at an arbitrary position. The easy-open packaging bag 1 of the first embodiment is not limited to the pillow-type packaging bag, and may be any packaging bag having the back-bonded heat-bonding portion 2, such as a gusset-type packaging bag. Applicable.

  As shown in FIG. 3, the opening cut 5 is a continuous linear cut that penetrates only the intermediate layer 12, and the opening cut 5 is formed by laminating the base material layer 11 on the outside and the heat-adhesive resin layer 13 on the inside. Being covered. The opening cut line 5 may be about a scar without penetrating the intermediate layer 12, but penetrating the cut line 5 is preferable because the linear tearing property of the laminate 10 is excellent.

  Next, the opening method of the easy-open packaging bag 1 concerning this invention is demonstrated using FIG. FIG. 4 shows a state in which one end thermal bonding portion 3 of the easy-open packaging bag 1 is stored in the end thermal bonding portion 3 after the contents are received from the opening in an unheat bonded opening state, and then opened. It is a perspective view explaining a state. As shown in FIG. 4, in order to open the easy-open packaging bag, the back-bonded heat-bonding portions 2 on both sides of the V-shaped notch 4 are respectively picked with fingers of both hands, and in a direction opposite to the end heat-bonding portion 3 side. When it is pulled, the laminated body 10 can be torn with the tip of the V-shaped notch 4 as the opening start point, and is torn so as to expand toward the bent parts 6, 6. The laminate 10 can be torn and opened along the cut line 5, the opening piece 7 is formed and the wide opening 8 is formed, and the opened packaging bag can be used as it is as the tray container 1 ′. The contents are not sagging and are hygienic and the contents can be easily taken out. Furthermore, since a wide opening is formed, the contents can be easily taken out to the end without staining the back and palm of the hand, although not shown.

  FIG. 5 is a cross-sectional view of a portion of the opening cut 5 ′ showing the second embodiment of the easy-open packaging bag according to the present invention, and is an enlarged cross-sectional view corresponding to FIG. 3. As shown in FIG. 5, the easy-open packaging bag of the second embodiment is composed of a laminate 10 ′ in which a base material layer 11 ′ and a heat-adhesive resin layer 13 ′ are laminated. It is a continuous linear cut formed only on the adhesive resin layer 13 ′ and penetrating through the heat-adhesive resin layer 13 ′. Others are the same as in the first embodiment, and a description thereof will be omitted.

  Although the laminate 10 ′ of the second embodiment has a two-layer configuration of a base material layer 11 ′ and a heat-adhesive resin layer 13 ′, three layers of a base material layer 11 ′, an intermediate layer, and a heat-adhesive resin layer 13 ′. It is good also as a structure. What is necessary is just to determine the layer structure of a laminated body by the performance requested | required of a packaging bag from the content to be packaged, the distribution form of goods, etc. In this embodiment, the opening cut 5 ′ is provided in the heat-adhesive resin layer 13 ′, but the opening cut 5 ′ may be provided in the base material layer 11 ′.

  As a method of forming the opening cut line 5, when a pattern is printed on the film to be the base material layer 11, the printed film to be the base material layer 11 and the film to be the intermediate layer 12 are laminated by dry lamination or extrusion lamination. Using a cutting blade or the like at a predetermined position corresponding to the pattern printed on the film to be the base layer 11 in the film to be the intermediate layer 12, a linear cut continuous in the flow direction of the film to be the intermediate layer 12 It is performed by the method of providing. Further, as a method for forming the opening cut 5 ′, a pattern is printed on the film to be the base layer 11 ′, and the printed film to be the base layer 11 ′ and the film to be the thermoadhesive resin layer 13 ′ are dried. When laminating by lamination, the thermal adhesive resin layer 13 is used by using a cutting blade or the like at a predetermined position corresponding to the pattern printed on the film to be the base material layer 11 ′ in the film to be the thermal adhesive resin layer 13 ′. It is performed by a method of providing a linear cut continuous in the film flow direction.

  Next, the base material layer, intermediate layer, and thermal adhesive resin layer constituting the laminate will be described. Biaxially stretched or uniaxially stretched such as polypropylene, polyethylene terephthalate, nylon, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, etc. for the base material layer and the intermediate layer, for example, polylactic acid-based biaxially stretched film derived from plants Furthermore, a film in which a gas barrier composition such as polyvinylidene chloride or polyvinyl alcohol is coated on each of the above films, or a film in which a metal oxide such as aluminum oxide or an inorganic substance such as silicon oxide is deposited 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. For the heat-adhesive resin layer, low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene / vinyl acetate copolymer, ionomer, polypropylene, etc. are used by film or extrusion lamination. .

  Moreover, a printing layer can be provided on the base material layer by ordinary gravure printing or flexographic printing, and a known gravure ink or flexographic ink can be used as the printing ink used for the printing. What is necessary is just to select the ink which adhere | attaches favorably with the film used for a layer.

  To laminate the base material layer, intermediate layer, and heat-adhesive resin layer, dry lamination (DL) using polyethylene-isocyanate-based, polyether-isocyanate-based adhesives, or extrusion lamination (EC) using polyethylene, etc. However, it is preferable that the laminate is laminated by dry lamination because the tearability of the laminate is improved.

Next, the present invention will be described in more detail with reference to the following examples.
Using the biaxially stretched polyethylene terephthalate film (PET) with aluminum oxide deposited (VM) on one side with a thickness of 12 μm on the base material layer of the laminate, a predetermined printing is performed on the VM surface by a gravure printing method to provide a printing layer The printed layer is laminated by a dry lamination method (DL) using a 15 μm thick biaxially stretched nylon film (ON) through a polyester-isocyanate adhesive and the polyester layer is further formed on the ON surface. A laminate for easy-open packaging bags (VMPET 12 μm / DL / ON 12 μm /) using a low-density polyethylene (LLDPE) having a thickness of 30 μm and laminated by a dry lamination method on a heat-adhesive resin layer via an adhesive. DL / LLDPE 30 μm). In addition, when laminating the printing layer surface of the printed VMPET and ON by dry lamination, a thickness of 0.2 mm is provided at a predetermined position corresponding to the pattern printed on the VMPET at ON immediately before heating and pressing at the bonding portion. A cutting edge made of a cemented carbide blade was applied to form a continuous opening cut in the ON flow direction.

  Using the above laminate, outer dimensions 170 mm (dimensions between the outer edges of the opposite end thermal bonding portions) × 125 mm (dimensions in the direction orthogonal to the back-bonding thermal bonding portions), end thermal bonding portions and back-bonding thermal bonding portions A pillow-type packaging bag with a seal width of 10 mm is prepared, the gap between the opening cuts formed on both sides sandwiching the back-bonded heat-bonded portion is 60 mm, and a V-shaped notch is attached to the back-bonded heat-bonded portion at one end An easy-open packaging bag that was provided at a position 20 mm from the outer edge of the bonded portion and the other end heat bonded portion was unheat bonded. A potato chip 30g was put from an unbonded end thermal bonding portion, and the end thermal bonding portion was thermally bonded and hermetically packaged to obtain a test sample.

  Using a biaxially stretched nylon film (ON) with a vinylidene chloride coating (K) on one side of 15 μm thick on the base material layer of the laminate, a predetermined printing is performed on the K surface by a gravure printing method to provide a printing layer. Laminate for easy-open packaging bags by laminating by dry lamination (DL) using 50μm thick linear low density polyethylene (LLDPE) to heat-adhesive resin layer via polyester-isocyanate adhesive layer A body (KON 15 μm / DL / LLDPE 50 μm) was prepared. In addition, when the printed layer surface of the printed KON and LLDPE are laminated by dry lamination, a thickness of 0.2 mm is provided at a predetermined position corresponding to the pattern printed on the KON in the LLDPE immediately before heating and pressing at the bonding portion. A cutting edge made of a cemented carbide blade was applied to form a continuous opening cut in the flow direction of LLDPE.

  Using the above laminate, an easy-open packaging bag similar to that in Example 1 was prepared, and a potato chip was enclosed in the same manner as in Example 1 to obtain a test sample.

  About the test sample produced in Example 1 and Example 2, the back-bonded heat-bonded portions on both sides of the V-shaped notch are respectively picked with fingers of both hands, and pulled in the opposite direction to the end heat-bonded portions to be tear-opened. Evaluated. In any sample, the laminate can be torn from the tip of the V-shaped notch, and is torn so as to expand toward the fold, and when it reaches the opening cut, it is further torn along the opening cut. Open, a wide opening was formed, and the tear-opening property was good. Moreover, the opened packaging bag can be used as a tray container as it is, and the contents are not spilled. In addition, the potato chips could be removed to the end without soiling the back of the hands and palms.

It is a perspective view which shows 1st embodiment of the easily openable packaging bag concerning this invention. It is sectional drawing of the laminated body of the easily openable packaging bag of 1st embodiment. It is an expanded sectional view which shows the cut for opening in the XX sectional drawing of FIG. It is a perspective view explaining the opening state of the easily openable gusset bag of FIG. It is an expanded sectional view which shows the site | part corresponded to FIG. 3 which shows 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Easy-open packaging bag 1 'Tray container 2 Back sticking heat bonding part 3 Edge heat bonding part 4 V-shaped notch 5, 5' Opening cut 6 Bending part 7 Opening piece 8 Opening opening 10, 10 'Laminate 11, 11 'base material layer 12 intermediate layer 13, 13' heat adhesive resin layer

Claims (3)

A rectangular laminate in which a base material layer, an intermediate layer, and a heat-adhesive resin layer are laminated is bent so that the heat-adhesive resin layer is on the inside, and heat-bonded so that the ends protrude outward. A packaging bag provided with a back-bonding heat-bonding portion to form a cylindrical body, heat-bonding the opening end of the cylindrical body, providing an end-portion heat-bonding portion, and providing an opening start means in the back-bonding heat-bonding portion Because
The unsealing start means is provided in the vicinity of the one end thermal bonding portion between the end thermal bonding portions,
One continuous linear opening cut that penetrates only the intermediate layer is formed in parallel with the back-bonded heat-bonding portion on both sides of the back-bonded heat-bonding portion. An easy-open packaging bag characterized by being made. A rectangular laminate in which a base material layer and a heat-adhesive resin layer are laminated is bent so that the heat-adhesive resin layer is on the inside, and heat-adhered so that the ends protrude outward, and back-attached A packaging bag in which a heat-bonding part is provided to form a tubular body, and an opening end of the tubular body is thermally bonded to provide an end heat-bonding part, and an opening start means is provided in the back-bonded heat-bonding part. ,
The unsealing start means is provided in the vicinity of the one end thermal bonding portion between the end thermal bonding portions,
One continuous linear opening that penetrates only the thermo-adhesive resin layer in parallel with the back-bonding heat-bonding portion at positions away from the back-bonding heat-bonding portion on both sides of the back-bonding heat-bonding portion An easy-open packaging bag characterized in that a cut is formed. The easy-open packaging bag according to claim 1 or 2, wherein the packaging bag is a pillow type packaging bag.