JP5374978B2 - Easy-open pillow packaging bag - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an easy-open packaging bag that can store solid contents and can be easily opened and taken out when used, and in particular, an aluminum layer that can be easily opened in a direction perpendicular to the film flow direction. The present invention relates to an easy-open pillow packaging bag that has barrier properties even if it does not contain.

  Conventionally, various means for easily opening a pillow packaging bag have been applied. For example, opening means, such as a cut tape system, a ring cut system, and a double notch system, are mentioned. The cut tape method is a method in which a tearing thread or tape is stretched around the periphery of the opening. However, in this method, the tearing location is determined in advance, so it is impossible to change the tearing position one after another in order to take out the individual contents one after another. Moreover, a member for cut tape and a supply means are required.

  The ring-cut method is a method in which a short ribbon is inserted into the back-pasted part of the package, and the part is heated and sealed to open the ribbon. Can be cut and opened. However, this method also has the above problems.

  The double notch method is a method of providing two notches in the back pasting portion, and can be opened by pinching the middle portion and pulling. According to this method, a force for pulling the unsealed portion of the back pasting portion in the direction opposite to the unsealing direction works, and a large force is required in the initial stage. In addition, when the notch is formed in a V shape, the scrap may be mixed into the contents. In many cases, a notch is made in the back seal part, and when the bag is torn from this part, the bag is cut around and opened.

  However, many use only a uniaxially stretched film, or a composite film of this and an aluminum foil or an unstretched film, and there are cases where the film is torn in a direction different from the stretching direction and the cut end does not open cleanly. It was.

  As a method for solving this problem, an easily tearable bag having a back seal portion using a material obtained by laminating two or more layers of films uniaxially stretched in the same direction and having a notch for opening in the back seal portion (For example, refer to Patent Document 1).

  However, since this device uses aluminum foil to ensure barrier properties, the recent implementation of the Containers and Packaging Recycling Law (formal name “Act on the Separated Collection and Recycling of Containers and Packaging”) Accordingly, when considering the disposal and recycling of empty bags after use, there has been a problem that the aluminum foil has to be separated and discarded, which is not easy to use. Furthermore, since the aluminum foil is not transparent, there are problems such as “the contents cannot be seen” and “the metal detector cannot be used”.

It has been proposed to use a laterally uniaxially stretched film stretched in the transverse direction so that the bag can be opened straight in the transverse direction. (Patent Document 2)
In addition, it is easy to cut the seal part of the bag with fine scratches, so that it can be cut from anywhere as long as it is a seal part (Patent Document 3), only a part of the laminated film (for example, a base film) There has been proposed a bag that is formed from a cut material and that can be opened from a place other than a seal portion such as a side edge of a pillow packaging bag. (Patent Document 4)
In order to make it easy to open and seal the solid contents in a flexible pillow packaging bag, the endless penetrating process in the vertical direction is applied to the back seal part and one side seal part of the packaging bag. There was something that was given to. (Patent Document 5)
However, in the case of this pillow packaging bag, since the side seal portion is scratched, there is a high risk that the film will be smashed by hitting the protrusions during distribution and storage. Also, for the solid content in the vertical direction to be stored, if the packaging bag is not opened in the horizontal direction, the contents may pop out, but the packaging bag does not have a straight cut in the horizontal direction, Even if an attempt was made to open the side seal portion from the scratched portion in the lateral direction, there was a problem such as tearing in the longitudinal direction from the middle. If the back seal portion is scratched only on one side, cutting is likely to stop at the back seal portion, and it may be difficult to take out contents such as a syringe.
Japanese Utility Model Publication No. 60-136964 Japanese Utility Model Publication No. 61-164133 JP 61-142159 A Japanese Patent Laid-Open No. 1-153459 JP 2007-210633 A

  The present invention is intended to solve the above-described problems of the conventional container for storing solid contents, and is easy to open the packaging bag during use, so that the contents can be easily taken out and discarded after use. It is an object to provide an easy-open pillow packaging bag having a barrier property that is easy to tear.

According to the first aspect of the present invention, a back seal portion is formed on the back surface side by heat-sealing the sealant film surface at the left edge and the sealant film surface at the right edge of the laminated film, and the upper edge is thermally fused. A pillow packaging bag provided with a contents storage portion by a top seal portion and a bottom seal portion heat-sealed at the lower edge,
The laminated film is a laminated film in which a stretched film, a barrier coat layer, a transverse tearing film, and a sealant film, which have been finely scratched on the surface in advance, are laminated in this order, and the stretched film and the transverse tearing film are The easy-open pillow packaging bag is characterized in that it is adhered to an adhesive after being applied to a transverse tearable film and dried with hot air .

  The invention according to claim 2 is characterized in that any one of a stretched polyester film, a stretched polyamide film and a stretched polypropylene film having a thickness of 8 to 30 μm is used as the stretched film. Pillow packaging bag.

  The invention of claim 3 is the easy-open pillow packaging bag according to claim 1 or 2, wherein the barrier coat layer is made of a mixture of an inorganic substance and a resin having a barrier property.

  The invention of claim 4 is characterized in that the easily tearable film according to any one of claims 1 to 3, wherein the transversely tearable film is a transversely uniaxially stretched high-density polyethylene film or polypropylene film having a thickness of less than 50 μm. Pillow packaging bag.

  The invention of claim 5 is characterized in that the sealant film is either a low density polyethylene film or a polypropylene film formed by a melt extrusion method or bonded to a substrate by a dry laminating method. 4. The easy-open pillow packaging bag according to any one of 4 above.

According to the easy-open pillow bag of the present invention, the laminated film constituting it includes a stretched film that has been finely scratched on the surface in advance. Opening can be easily started not only from a specific place but also from any position on the side of the packaging bag, and by including a tearable film in the structure, opening can be stably advanced in the lateral direction. .

Furthermore, the laminated film which comprises comprises a barrier coat layer can improve the barrier property which fell by the fine scratch processing of the surface, and can ensure the preservability of the content. This makes it possible to secure an inferior barrier property despite being transparent compared to the conventional case where aluminum foil is used as the barrier layer, enabling the packaging contents to be seen and metal. It has become possible to provide easy-open pillow bags that can be used with detectors.
According to the easy-open pillow bag of the present invention, it can be opened from either the left or right side of the pillow bag, and the resistance to tearing in the lateral direction at the back seal portion is small, so that the back seal can be cut over. As a result, since it can be cut linearly in the horizontal direction, it is possible to quickly and easily take out the contents that are long in the vertical direction without using tools such as scissors.

  The easy-open pillow packaging bag of the invention of claim 2 can be used for a fine scratch processing by using any one of a stretched polyester film, a stretched polyamide film, and a stretched polypropylene film having a thickness of 8 to 30 μm as the stretched film. Even when applied, it has strength as a packaging material and can withstand heat and tension during production including printing.

  In the easily openable pillow packaging bag of the invention of claim 3, the barrier coat layer is made of a mixture of an inorganic substance and a resin having a barrier property, thereby ensuring the barrier property without sacrificing the easy tearability of the laminated film. It became possible.

  In the easily openable pillow packaging bag of the invention of claim 4, the transverse tearable film is a transverse uniaxially stretched high-density polyethylene film or polypropylene film having a thickness of less than 50 μm, whereby the tear resistance in the stretching direction of the transverse tearable film is reduced. Can be held below the strength to tear easily by hand.

In the easy-open pillow packaging bag of claim 5, the sealant film is either a low-density polyethylene film or a polypropylene film formed by a melt extrusion method or bonded to a substrate by a dry lamination method. As can be seen in a normal linear low density polyethylene sealant layer, it is possible to prevent a situation where only the sealant layer is stretched at the time of opening and does not break cleanly.
As described above, according to the present invention, there is provided an easy-open pillow packaging bag having a barrier property that allows easy opening of the packaging bag at the time of use, easy removal of the contents, and easy disposal after use. I can do it.

  Next, an example of an embodiment of the easy-open pillow packaging bag of the present invention will be described with reference to the drawings. FIG. 1: is the (a) cross-sectional schematic diagram of an example of the easily openable pillow packaging bag of this invention, (b) The plane schematic diagram seen from the back seal side. FIG. 2 is a schematic cross-sectional view showing a layer structure of an example of the pillow packaging bag of the present invention, and shows a case where fine scratch processing penetrates a stretched film. FIG. 3 is a schematic cross-sectional view showing an example of the layer structure of an example of the pillow packaging bag of the present invention, and shows a case where fine scratch processing does not penetrate through the stretched film.

  The easily openable pillow packaging bag (1) of the present invention shown in FIG. 1 has an outer fine scratch processed stretched film (B), an inner transverse tearable film, and an innermost sealant film (A) bonded together. This is an easy-open pillow packaging bag made of laminated film, and on the back side of the pillow packaging bag, the sealant film surface of the left side edge of the laminated film and the sealant film side of the right side of the laminated film are heat-sealed and back sealed. Forming a part (2), heat-sealing the upper edge part to form a top seal part (3), and heat-sealing the lower edge part to form a bottom seal part (4); Is provided.

  The laminated film of FIG. 2 is composed of a wound stretched film (5) having an ink layer (6) and a barrier coat layer (7) lateral tear film (8) adhesive layer (from the outside of the easy-open pillow bag). 9) It is in the order of the sealant layer (10). Note that illustration of other adhesive layers and surface treatments applied as necessary is omitted for the sake of simplicity.

  2 is different from the layer structure of FIG. 3 in that the depth of scratching (E) penetrates the stretched film (5) ink layer (6) in FIG. There is no point. The barrier coat layer (7) is usually coated on the transverse tear film (8), but if the depth of the scratch (E) does not penetrate the stretched film (5) as shown in FIG. It is also possible to apply on the surface of (6).

  The material of the scratch-processed stretched film (5) used in the easy-open pillow packaging bag of the present invention is not particularly limited as long as it does not deform due to heat or tension during production, but usually has barrier properties, strength, and suitability for scratch processing. From this point, polyesters such as polyethylene terephthalate, polyamide, and polypropylene are preferable.

  Scratch processing applied to the stretched film (5) is performed either before or after printing, with “perforation processing” and “micro-scratch processing” that cause the entire surface or part of the cut. A commercially available whole surface finely processed PET film (eg, Tiafan: Toyobo) or the like may be used.

  The stretched film (5) preferably has a thickness in the range of 8 μm to 30 μm. If the thickness is less than 8 μm, deformation or cutting occurs during processing, and if it is 30 μm or more, scratching is difficult to enter and the cutting property is deteriorated, which is not economical.

Although it does not specifically limit as a barrier-coat agent which forms the barrier-coat layer (7) of the laminated | multilayer film used for the easily openable pillow packaging bag of this invention, As a raw material, "Inorganic substances, such as mica", and "resin which has barrier property" (EVOH, liquid crystal polymer, acrylic, etc.) "dissolved / emulsion-dispersed is used. A commercially available mixed water coating agent (Ecostage: Sakata Inx) or the like may be used.
Basically, the coating is carried out on the transverse tearable film (8), but if the stretched film (5) is not penetrated as shown in FIG. It doesn't matter.

  As the transverse tearable film (8) used for the laminated film used in the easy-open pillow packaging bag of the present invention, a film that can be cut straight in the lateral direction with a film formed by stretching in the lateral direction is used. Typical films include “electrochemical industry: Karariyan” based on high-density polyethylene and “Toray film processing: YT” based on polypropylene. The thickness is preferably less than 50 μm because the surface film needs to be cut without being scratched. There is a possibility that it cannot be cut beyond this.

  As a sealant layer (10) used for the laminated film used for the easy-open pillow packaging bag of the present invention, low density polyethylene or polypropylene is desirable. General linear low density polyethylene is not desirable because only the sealant stretches when opened, but it may be blended with an inorganic substance or a different kind of resin in order to impart transverse tearability.

Printing on the stretched film (5) used in the laminated film used in the easy-open pillow packaging bag of the present invention is performed using a normal printing ink by a printing method such as gravure printing. At this time, a known film surface treatment such as a corona treatment or an anchor coat can be used in combination if necessary from the viewpoint of printability or adhesion of ink to a film.

  The fine scratch processing on the stretched film can be performed when the printed stretched film is slit. It is most efficient to carry out the fine scratch processing simultaneously with the printing of the printed stretched film.

  Next, the stretched film (5) (6) that has been printed and processed with fine scratches and the transverse tear film (8) coated with the barrier coat layer (7) are dry-laminated.

  As an adhesive used for dry lamination, polyester, polyether, polyurethane, polyether urethane, polyester urethane, isocyanate, polyolefin, polyethyleneimine, cyanoacrylate, organic titanium compound, epoxy, Well-known dry lamination adhesives comprising imide-based, silicone-based resins and modified products or mixtures thereof can be mentioned. If necessary from the viewpoint of adhesiveness, a known film surface treatment such as corona treatment or anchor coating can be used in combination.

  As a dry laminating method, an adhesive is applied to the printed surface (6) of the printed stretched film using an ordinary apparatus such as gravure coating and dried with hot air, and then a barrier tear layer (7) is applied. There is also a method of superimposing (8) and winding up after passing through the nip roll, but in this method, adhesion of the adhesive to the roll or winding by winding out the adhesive from the part of the stretched film that has been finely scratched is taken up. The risk of blocking is inevitable.

  Therefore, in the production of the easy-open pillow packaging bag of the present invention, the adhesive coating is applied to the barrier coat layer surface of the transverse tear film, dried with hot air, and then overlapped with the printed surface of the stretched film, and then wound through the nip roll. The method of taking is desirable. By doing so, it is possible to effectively prevent blocking and the like of the adhesive from the finely scratched portion.

The sealant layer (10) of the laminated film used in the easy-open pillow packaging bag of the present invention can be laminated on the barrier coat surface of the transverse tear film by two methods. One is a method of laminating a sealant resin on the barrier coat surface of a transverse tearable film by extrusion processing using a normal extruder, and the other is a method of laminating a sealant film by dry lamination. If necessary from the viewpoint of adhesiveness, a known film surface treatment such as a corona treatment or an anchor coat can be used in combination on the lateral tear film surface.
As a method of dry lamination, a usual method can be used. If necessary from the viewpoint of adhesiveness, a known film surface treatment such as corona treatment or anchor coating can be used in combination.

<Example 1>
A finely wound surface penetrating from the surface of the printed stretched polyethylene terephthalate (PET) film having a thickness of 12 μm was applied to the entire surface.

In addition, a lateral uniaxially stretched high-density polyethylene (HDPE) film (Kalariyan Y: Denki Kagaku Kogyo) 18 μm as a lateral tear film, and a mixed water-based coating agent of an organic component ethylene vinyl acetate copolymer (EVOH) and an inorganic material as a barrier agent (Ecostage: Sakata Inks) was applied to the entire surface by 1 g / m ^{2 and} bonded to the above-mentioned stretched PET film subjected to fine scratch processing by a dry laminating method.

Furthermore, a laminate film for evaluation was prepared by laminating an HDPE film having a thickness of 50 μm as a sealant layer on the side of the laterally split film by a dry laminating method.

  Next, using this laminated film, after back sealing with a pillow packaging machine, heat sealing is performed in the order of bottom sealing, content filling, and top sealing, and the cross section is shown in FIG. A package using a pillow packaging bag having a width of 50 mm and a length of 100 mm was obtained. The opening and barrier properties of this packaging bag were evaluated.

<Example 2>
A fine scratch processing penetrating from the surface of the printed stretched PET film having a thickness of 12 μm was performed on the entire surface.

In addition, a laterally uniaxially stretched HDPE film (Kalariyan Y: Denki Kagaku Kogyo Co., Ltd.) 18 μm, which is a lateral tear film, is mixed with a water-based coating agent (Eco-stage: organic material ethylene vinyl acetate copolymer (EVOH) and an inorganic material) (Sakata Inks) was applied to the entire surface by 1 g / m ² .

  While the anchored coating was applied to the stretched PET film that had been finely scratched, the transverse tear film and an HDPE film having a thickness of 50 μm as a sealant layer were bonded together by a 15 μm sand lamination process to produce a laminated film for evaluation.

  In the same manner as in Example 1, the laminated film was made into a pillow bag having a width of 50 mm and a length of 100 mm to evaluate the opening and barrier properties.

<Example 3>
Print on PET film (Tear Fine: Toyobo) with a surface micro scratch of 16μm thickness, apply 1g / m ² of barrier coating agent (Ecostage) on the entire surface, and laterally tear film (Kalariyan Y) with a thickness of 18μm And were laminated by the dry laminating method.

The printed surface fine scratch processed PET film was bonded to the lateral tear film with HDPE of 15 μm by sand lamination while anchor coating.
Further, a laminate film for evaluation was prepared by laminating HDPE having a thickness of 50 μm as a sealant layer to the laterally tear film by a dry laminating method.

  In the same manner as in Example 1, the laminated film was made into a pillow bag having a width of 50 mm and a length of 100 mm to evaluate the opening and barrier properties.

<Comparative Example 1>
Printed on a transparent alumina vapor-deposited PET film (GL-AEC: letterpress printing) with a thickness of 12 μm from the non-deposited surface side, and then printed with a lateral tear film (Kalariyan Y) with a thickness of 18 μm. Pasted together.
Furthermore, LDPE having a thickness of 50 μm was bonded to the laterally split film surface by a dry laminating method to prepare a laminated film for evaluation.

  In the same manner as in Example 1, the laminated film was made into a pillow bag having a width of 50 mm and a length of 100 mm, and the unsealing property and the barrier property were evaluated.

<Comparative example 2>
After printing on a 12 μm-thick transparent alumina vapor-deposited PET film (GL-AEC: letterpress printing), it was bonded to a 18 μm-thick lateral tear film (Kalariyan Y) by a dry laminating method.
Further, an evaluation laminated film was prepared by laminating 50 μm of LDPE on the lateral tear film surface by a dry laminating method.

In the same manner as in Example 1, the laminated film was made into a pillow bag having a width of 50 mm and a length of 100 mm, and the unsealing property and the barrier property were evaluated.
<Evaluation>
The packaging bodies of the above-described Examples and Comparative Examples were comparatively evaluated for lateral tearing and barrier properties.
Lateral tearability evaluation method: Whether the prototype pillow bag can be opened sideways without problems
I evaluated.
Barrier property evaluation method: Laminate film for evaluation was cut into 100 mm × 100 mm and oxygen permeation
Excessiveness was measured. Specified in JIS K7126-1987
The oxygen transmission rate was measured according to the method. This measurement is performed at a temperature of 20 ° C.
There is Modern Control in an environment with a relative humidity of 65%.
This was carried out using an OXTRAN 2/21 manufactured by the manufacturer. The unit of the result is ml /
m ² / day / MPa
The results are shown in Table 1. Expression of evaluation is ◎ ○ Good: × Bad

この結果、延伸フィルムに微細傷加工を施し、バリアコート剤を塗工した横裂きフィルムとラミネートした積層フィルムを使用することにより、バリア性と横裂き開封性を併せ持った易開封性ピロー包装袋を実現することが出来た。

As a result, an easy-open pillow packaging bag that has both barrier properties and lateral tear-opening properties can be obtained by applying a micro-scratch process to the stretched film and using a laminated film laminated with a barrier-coated agent. It was possible to realize.

  The packaging body using the easy-open pillow packaging bag of the embodiment can be opened from either the left or right side of the pillow bag, and the resistance to tearing in the lateral direction at the back seal portion is low, so it is possible to get over the cut of the back seal Easy to be cut and openability is excellent.

Pillow packaging bag of the present invention (a) Schematic cross-sectional view (b) Schematic plan view seen from the back seal side Cross-sectional schematic diagram showing a layer structure of an example of the pillow packaging bag of the present invention Cross-sectional schematic diagram showing a layer structure of an example of the pillow packaging bag of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pillow packaging bag 2 ... Back seal part 3 ... Top seal part 4 ... Bottom seal part 5 ... Stretch-processed stretched film 6 ... Ink 7 ... Barrier coat layer 8 ... Lateral tear film 9 ... Adhesive layer (adhesive for dry lamination) Or SPE)
10 ... Sealant layer A ... Pillow packaging bag inner surface side B ... Pillow packaging bag outer surface side E ... Scratch processing (cross section)

Claims (5)

A top seal part and a bottom end are formed by forming a back seal part on the back side, which is heat-sealed with the sealant film surface at the left edge and the sealant film face at the right edge of the laminated film, and heat-sealing the top edge. A pillow packaging bag provided with a content storage portion by a bottom seal portion heat-sealed at the edge,
The laminated film is a laminated film in which a stretched film, a barrier coat layer, a transverse tearing film, and a sealant film, which have been finely scratched on the surface in advance, are laminated in this order, and the stretched film and the transverse tearing film are An easy-open pillow packaging bag, which is bonded to an adhesive after being applied to a transverse tearable film and dried with hot air .   The easy-open pillow packaging bag according to claim 1, wherein any one of a stretched polyester film, a stretched polyamide film, and a stretched polypropylene film having a thickness of 8 to 30 µm is used as the stretched film.   The easy-open pillow packaging bag according to claim 1 or 2, wherein the barrier coat layer comprises a mixture of an inorganic substance and a resin having a barrier property.   The easily openable pillow packaging bag according to any one of claims 1 to 3, wherein the laterally tearable film is a laterally uniaxially stretched high-density polyethylene film or a polypropylene film having a thickness of less than 50 µm.   The sealant film is any one of a low density polyethylene film and a polypropylene film formed by a melt extrusion method or bonded to a base material by a dry laminating method. The easy-open pillow packaging bag described.

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