JP2002211589A - Self-supporting bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-supporting bag for hermitically packaging flowable contents such as a liquid, which has a large capacity, and in addition is easy to carry and with which the contents can be safely and easily transferred to another container in a short time even when the contents has high viscosity. SOLUTION: A base of a bag is formed in a format having gussets 4 using a base film. A barrel is formed by heat-sealing both side end rims of front and rear wall face films 1 and 1' by side seals 6 and 6 equipped with expanded seals 7 and 7 on an upper part. Holes 8 and 8 for holding the bag are provided on the expanded seals 7 and 7, and further the spout 20 comprising a plastic molding is joined with an edge at the center of an upper part of the bag, thereby constituting the self-supporting bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-standing bag used for hermetically packaging a liquid material, as well as powdery, granular and other fluid contents, and more particularly to a shape-retaining bag such as a bottle. It can be suitably used as a substitute container for a container, or as a refill container for refilling contents in a shape-retaining container, and has excellent storage stability and self-sustainability of the contents, and particularly has a capacity of 1 L to 2 L. The present invention relates to a self-contained bag which is excellent in suitability for carrying or transferring contents to another container even when it is relatively large, and which is also excellent in disposal property after use.

[0002]

2. Description of the Related Art Conventionally, in addition to various liquid detergents, cleansers, softeners, emulsion pastes, etc., various beverages, liquid seasonings such as soy sauce, sauces, noodle soups and the like, liquid substances, powders such as milk powder, cocoa, etc. Was mainly filled in containers having shape retention, such as plastic bottles, glass bottles, and metal cans, distributed and used, and used containers were discarded. On the other hand, there is also a problem of waste disposal, and these containers are being sorted, collected, and recycled after use. However, such shape-retaining containers have a strong tendency to consume resources, and the ratio of container cost to commodities cannot be ignored.

[0003] From such a viewpoint, there has been a demand for a lower-priced, simpler container such as a bag made of a soft packaging material such as a laminate film. Such a simple container can be used as a substitute for a shape-retaining container such as the plastic bottle, glass bottle, or metal can, or as a refill container used to refill a container such as a used bottle with the same contents. Can also be used. As such a simple type container, for example, a container using a self-standing bag called a standing pouch as it is, or a container provided with a narrow spout at the top of the standing pouch, and further, a spout of the spout In order to further stabilize the opening property and the shape retention property, there is an example in which a spout made of a plastic molded body is attached to the upper part of the standing pouch.

[0004] Such bags consume less material,
It is lightweight and can pack contents compactly, which saves resources and reduces logistics costs.It also has advantages such as easy disposal after use, especially above the standing pouch. The one with a spout made of a plastic molded body at the
The shape of the spout is good, the spout is not clogged in the middle of the pouring, and the useability is excellent as well as the performance such as the preservability of the contents.

[0005]

However, even in the case where a spout made of a plastic molded body is attached to the upper part of the above-mentioned standing pouch, the main body of the bag is soft because the laminated film forming the bag itself is thin and low in rigidity.
If the capacity of the bag is as large as 1L to 2L, the weight will be heavy, so it is difficult to hold it when carrying it. Also, when transferring the contents filled in the bag to another container, the shape of the spout will be preserved. It is good, but since the body of the bag is soft and the body can not be grasped strongly, it is common to pour out by supporting the upper and lower parts of the bag by hand from the bottom, especially the upper part of the bag is a spout The width of the upper part of the bag is too large with respect to the width of the bag, and there is a problem that it is difficult to hold the bag by hand and the transfer operation itself becomes troublesome.

[0006] The present invention has been made to solve the above problems, and its object is to provide:
This is a laminated film bag that seals and packs fluid contents such as liquids. It has good storage stability, is lightweight and bulky, and is easy to dispose of after use. Equipped with a spout with excellent shape retention, the bag after filling the contents has excellent self-sustainability, even when the bag capacity is relatively large,
Easy to carry, easy to hold by hand when transferring contents to another container, safe and easy to transfer contents to the end, not only as a replacement container such as a bottle, but also for refilling An object of the present invention is to provide a self-standing bag that can be suitably used as a container.

[0007]

The above objects can be attained by the present invention described below. That is, in the invention described in claim 1, the lower part of the bag is inserted between the lower part of the front and rear two wall films by folding the bottom film inward,
The bag is formed in a form having a gusset portion formed by heat-sealing the peripheral portion, and the body portion is formed by heat-sealing the edge portions on both sides of the front and rear wall film with the side seal portion. Gusset part is heat-sealed with a seal pattern of a shape giving self-supportingness, and an enlarged seal part for forming a grip part is provided above the side seal parts on both sides, and the enlarged seal part holds the bag. Holes are provided for
Furthermore, a spout made of a plastic molded body is joined to an edge at the center of the upper part.

In the self-standing bag of the present invention, the seal pattern having the shape of imparting self-sustainability for heat sealing the lower gusset portion is a seal pattern in which the inner side is concavely concave from both sides toward the center. Anything, especially
A so-called ship bottom seal pattern, such as a seal pattern in which the inside is concave in a curved linear shape from both sides toward the center, or a seal pattern in which the inside rises straight from the bottom with a predetermined width to both sides inclining outward. However, it is more preferable that the bottom surface can be formed smoothly and at the same time, excellent self-sustainability can be imparted.

The spout made of a plastic molded body may be a two-piece type in which the spout and the cap are separately formed, or the spout and the cap are integrally formed via a thin portion. It may be a molded one-piece type. However, when the spout is also used as a filling port for contents, a two-piece type spout in which the cap and the spout are separately formed is preferable in that the filling operation can be easily performed. In addition, the shape of the hole for holding the bag may be any shape such as an elliptical shape, a circular shape, a plurality of oval shapes or a circular shape, as long as it is a hole into which a finger can be inserted. Alternatively, it may be a hole formed by a score line partially provided with a connecting portion.

[0010] By adopting such a configuration, the self-standing bag of the present invention can consume less material, is lighter and less bulky than a shape-retaining container such as a plastic bottle.
Disposal after use also becomes easier. The contents can be easily filled from the spout with the cap removed, and after filling, the cap can be closed and sealed.
The self-standing bag filled with the contents is greatly expanded back and forth by the bottom gusset part and its seal pattern,
Heat-sealed legs are formed on the outer periphery of the bottom surface, providing excellent independence and easy handling.Furthermore, the enlarged seal at the top of the side seal of the bag has a hole for holding the bag. Therefore, even if the capacity of the bag is relatively large, it is easy to carry.

When the filled contents are transferred to another container, a spout made of a plastic molded body is joined to the upper central edge of the bag, and the side seal portions on both sides are provided. Since the hole for holding the bag is provided in the enlarged seal part at the top of, after removing the spout and opening the spout, bend the enlarged seal part on both sides in the same direction, and The upper part of the bag can be held by inserting fingers into the hole, and the lower part of the bag can be supported by hand from below, so it is easy to hold even if the bag has a large capacity. By tilting the bag while fixing it to
The contents can be easily discharged from the small-diameter discharge port. Therefore, the transfer operation can be performed easily, and at the same time, the contents can be safely and easily transferred to the end even in a small-diameter container.

According to a second aspect of the present invention, there is provided the self-standing bag according to the first aspect, wherein the hole for holding the bag is formed by a score line partially provided with a connecting portion. Become.

[0013] By adopting such a configuration, in addition to the operation and effect of the invention described in the first aspect, in the manufacturing process of the bag, no chipping of holes is generated, so that a chip removing device is not required. In addition, the quality control is easy and the productivity can be improved without any swarf being mixed by mistake. Further, by forming a hole for holding the bag with a score line provided with a connecting portion in a hinge shape on the holding side, when inserting a finger into the hole, bending the connecting portion,
Since the bag can be held at the bent portion, the touch can be softened.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention, such as a film used for a self-standing bag of the present invention and a method for manufacturing the self-standing bag, will be described. The film used for the self-standing bag of the present invention is mainly a laminated film mainly composed of plastic, but is not particularly limited, and any known laminated film used for a packaging bag for contents such as a liquid may be used. Can also be used, and a suitable material can be freely selected and used according to the use conditions, such as the kind of contents to be filled and the presence or absence of heat treatment after filling. As a representative example of the configuration of the laminated film used for the self-standing bag of the present invention, the following configuration is exemplified.

(1) ON film / adhesive / L·LDPE
Film (sealant layer) (2) ON film / adhesive / biaxially stretched HDPE film / adhesive / L / LDPE film (sealant layer) (3) ON film / adhesive / biaxially stretched PP film / adhesive / L・ LDPE film (sealant layer) (4) ON film / adhesive / biaxially stretched PP film / adhesive / aluminum foil / adhesive / L ・ LDPE film (sealant layer) (5) ON film (silica or alumina deposited layer) ) / Adhesive / biaxially stretched HDPE film / adhesive / L·LDPE
Film (sealant layer) (6) ON film / adhesive / (silica or alumina deposited layer) PET film / adhesive / L / LDPE film (sealant layer) (7) ON film / anchor coat layer / co-extrusion coat layer ( (8) ON film / anchor coat layer / coextrusion coat layer (HDPE layer / LDPE layer) / adhesive / L·LDP
E film (sealant layer) (9) PET film / adhesive / aluminum foil / adhesive / ON film / adhesive / L / LDPE film (sealant layer) (10) PET film / adhesive / aluminum foil / adhesive / ON film / adhesive / CPP film (sealant layer) (11) PET film / adhesive / ON film / adhesive /
Aluminum foil / adhesive / L / LDPE film (sealant layer) (12) PET film / adhesive / ON film / adhesive /
Aluminum foil / adhesive / CPP film (sealant layer) (13) PET film / adhesive / EVOH film / adhesive / ON film / adhesive / CPP film (sealant layer) Instead, various combinations of laminated films can be used.

In the above construction, the ON film is a biaxially stretched nylon film, the PET film is a biaxially stretched polyethylene terephthalate film, PP is polypropylene, L·LDPE is linear low density polyethylene, HDP
E is high density polyethylene, LDPE is low density polyethylene, CPP film is unstretched polypropylene film,
The EVOH film refers to a saponified ethylene-vinyl acetate copolymer film.

The adhesive between the film layers is usually used for lamination by a dry lamination method.
A known adhesive for dry lamination such as a liquid-curable polyurethane-based adhesive can be used. In addition, the anchor coat is a kind of primer coat that is previously coated on the base film side in order to improve adhesiveness when laminating a resin by extrusion coating.

In the structure of the laminated film, when the ON film and the PET film are used for the outermost layer, they are used as a base film for imparting mechanical strength, heat resistance, printability, etc. to the bag, If you use
It is mainly used to reinforce mechanical strength. When a biaxially stretched HDPE film or a biaxially stretched PP film is used for the intermediate layer, the thickness of the laminated film can be increased, its rigidity and mechanical strength can be increased, and the water vapor permeability can be reduced.

The aluminum foil, the silica or alumina vapor-deposited layer, the EVOH film, etc. are laminated mainly to provide gas barrier properties. In addition to these, a metal vapor-deposited layer of aluminum or the like, polyvinylidene chloride A coating layer or a gas barrier material such as a polyacrylonitrile film may be laminated.

As the innermost sealant layer, L·LD
Although two examples of PE film and CPP film are given, L / LDPE film is excellent in heat sealing stability and content resistance, such as stress cracking resistance to surfactants, and CPP film is heat resistant. It has excellent low odor properties and is suitable for packaging of contents requiring these properties.

In the sealant layer, in addition to the above, depending on the content to be filled, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer may be used. Polymers, ionomers, polyester resins and the like can also be appropriately selected and used.

Particularly, an ethylene / α-olefin copolymer obtained by polymerization using a single-site catalyst such as a metallocene catalyst has a narrow molecular weight distribution and a stable copolymerization ratio, so that the low-temperature heat sealability and A sealant for a bag that is excellent in hot sealability and has a step due to a difference in film overlap in the heat seal portion, such as between the lower gusset portion and the body seal portion, such as the self-standing bag of the present invention. The layer is suitable because it can prevent the occurrence of pinholes due to missing seals. Further, by using the copolymer blended with an olefin-based elastomer, the heat fluidity of the sealant layer is improved, and the occurrence of pinholes due to the step or the like can be more effectively prevented.

The contents to be filled in the self-standing bag of the present invention are not limited to liquid substances, but may be anything such as foods and non-foods as long as they have fluidity such as powdery and granular. For example, in the case where contents that are easily oxidized such as edible oil are filled, and when a light-shielding material such as aluminum foil is not laminated in the laminated film, any one of the laminated films, or a plurality of layers. UV absorber can be kneaded into the mixture. Further, an ultraviolet absorbing agent may be mixed with a resin, and the ultraviolet absorbing layer may be provided by a coating method. One or two or more compounds selected from the following can be used as the ultraviolet absorber. In organic systems, benzophenone-based, benzoarizole-based, salicylic acid-based, organic nickel-based, acrylonitrile-based, monobenzoic acid-based, oxalic anilide-based, cyanoacrylate-based, and triazo-based ultraviolet absorbers. , Zinc, cerium and the like can be used.

Next, a method for producing a self-standing bag of the present invention produced using the above-described laminated film will be described.
The self-standing bag of the present invention is basically formed by using a conventional bag making machine for standing pouches (a bag making machine for single row bag making or a bag making machine for double row bag making). It can be easily manufactured by changing the seal pattern of the portion so as to provide an enlarged seal portion on the upper portion, and appropriately adding a processing device as described below. That is, a punching device that provides a hole for holding a bag in an enlarged seal portion provided on an upper portion of a side seal portion, and a punching device when trimming a part of both edges on the upper portion of the bag, and a spout. It can be easily manufactured by appropriately adding a mounting device or the like and processing each. The spout may be attached in-line at the time of bag making, or may be attached off-line after the bag is made.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. However, unless the present invention exceeds the gist,
It is not limited to the following drawings. Further, the same reference numerals are used for the parts having the same names in different drawings. 1 to 3 are front views each showing a configuration of an embodiment of the self-standing bag of the present invention.

FIG. 1 is a front view showing the structure of a first embodiment of the self-standing bag of the present invention. Self-standing bag 100 shown in FIG.
The bottom film is folded inward between the lower portions of the front and rear wall films 1 and 1 ', and the bottom film cutouts 2 are provided near the lower ends of both side edge portions and the upper portion thereof. And a gusset part 4 formed by inserting the gusset part 4 into the bottom film folding part 3, the gusset part 4 having a shape in which the inside is concavely curved in a curved line from both sides toward the center part. Shape seal pattern, that is, formed by heat sealing with the bottom seal portion 5,
The edge portions on both sides of the front and rear wall films 1, 1 'are heat-sealed with side seal portions 6, 6 provided with enlarged seal portions 7, 7 for forming a grip portion 9 on the upper portion. The enlarged seal portions 7, 7 are provided with holes 8, 8, for holding the oblong bag, so that the longitudinal direction thereof is oriented in the vertical direction, and at the center edge of the upper portion of the bag 100. The spout 20 made of a plastic molded body is joined.

The holes 8 for holding the bag are shown as punched holes punched all around, but, for example, a score line partially provided with a hinge-like connecting portion or a sewing machine. It may be provided by a hole formed by an intermittent cut line such as a line. This applies to the self-standing bag shown in FIGS. 2 and 3 below.

In this case, the spout 20 has a cylindrical body as a main body, an adhesive base 22 is provided at a lower portion, a flange is appropriately provided thereon, and a separate screw type cap 21 is attached at an upper portion. This is a two-piece type configuration. The spout 20 is attached to the bag by heat-sealing the upper part of the self-standing bag 100 with the upper seal part 10 between the films on both sides of the center edge of the upper part.
2 can be inserted and heat-pressed from the outside by using ultrasonic waves or other heating means, and can be joined by heat bonding. The material of the spout 20 needs to be thermally bonded to the sealant layer of the laminated film of the bag. According to the material of the sealant layer, for example, polypropylene, polyethylene such as medium density or high density, polyester, etc. Can be used.

By adopting such a configuration, the self-standing bag 100 is lightweight, not bulky, has good preservability of the contents, and has good waste disposal after use, since the bag body is formed of a laminated film. Easy. The contents can be easily filled from the spout 20 with the cap 21 removed, and after filling, the cap 21 can be closed and sealed. Before the cap 21 is closed, a sealing material (not shown) made of a laminated film may be thermally bonded to the opening at the tip of the spout 20 to further improve the sealing performance.

The self-standing bag 100 filled with the contents is heat-sealed at the lower gusset portion 4 with the bottom seal portion 5 of a ship bottom shape formed by a curved line on the inside, so that the bottom portion is rounded back and forth. It spreads greatly, and the outer periphery of the bottom is formed with a ring-shaped leg formed by a heat-sealed portion joined at both sides by the bottom film cutouts 2 and 2 on both sides, so that excellent self-supporting properties are provided and easy to handle. Further, since the enlarged seal portions 7 on both sides of the upper portion of the bag are provided with holes 8 for holding the bag, the bag can be easily held and carried.

When the contents are transferred to another container, the cap 21 is removed, the spout 20 is opened, and the enlarged seal portions 7, 7 on both sides are bent in the same direction to hold the bag from both sides. The fingers can be inserted into the holes 8, 8 to hold the upper part of the self-standing bag 100 and to support the lower part by hand from below, so that the bag can be easily held even when the bag has a large capacity, and the transfer operation can be easily performed. In this state, the spout 20 is fixed to the mouth of the container and the self-standing bag 100 is tilted.
The contents are smoothly poured out from the small-diameter spout 20, and the contents can be safely and easily transferred to the end. In addition, since the spout 20 can be repeatedly opened and closed at any time, the capacity of the self-standing bag 100 is large,
The present invention can also be suitably used in a case where the contents are used in a plurality of times.

FIG. 2 is a front view showing the configuration of a second embodiment of the self-standing bag of the present invention. Self-standing bag 200 shown in FIG.
In the configuration of the self-standing bag 100 shown in FIG. 1, the angle of the bag holding holes 8, 8 provided in the enlarged seal portions 7, 7 on both sides of the upper portion of the bag is set not in the vertical direction but in the upper direction. , And is configured in such a manner that it is formed in the same manner as the self-standing bag 100 shown in FIG. 1 except for the above-described changes. This configuration shows an example of a variation of how to provide the holes 8 for holding the bag.

By adopting such a configuration, when the contents filled in the self-standing bag 200 are transferred to another container,
When both sides of the spout 20 on the upper part of the bag are bent in the shape of a letter "C" on the same side, the holding holes 8, 8 of the bags on both sides are aligned and easy to hold, so that the upper part of the bag is more easily held. Then, the contents can be transferred. Except for the above changes, the self-standing bag 100 shown in FIG.
The same operation and effect as the self-standing bag 100 shown in FIG.

FIG. 3 is a front view showing the structure of a third embodiment of the self-standing bag of the present invention. Self-standing bag 300 shown in FIG.
In the configuration of the self-standing bag 200 shown in FIG. 2, only the shape of the bag holding holes 8, 8 provided in the enlarged seal portions 7, 7 on both sides of the upper portion of the bag is one (left side in the figure). Is provided as it is, and the other (right side in the figure) is provided by changing to two divided holes 8 and 8,
Except for the above-mentioned changes, all the components are formed and configured in the same manner as the self-standing bag 200 shown in FIG. This configuration also shows an example of a variation in the method of providing the holes 8 for holding the bag.

Even when such a configuration is adopted, the basic operation and effect are not changed, but by dividing the bag holding hole into two, each hole becomes smaller, and
Since the total area of the holes is also reduced, the strength of the handle 9 can be improved. Therefore, it is effective when the strength of the laminated film is low. However, in terms of usability, it is not always good, and it is possible to select in consideration of both.
As described above, the hole for holding the bag can be selected and provided arbitrarily suitable for the shape, size, angle, and the like.

[0036]

As described above in detail, according to the present invention, there is provided a laminated film bag for hermetically packaging a fluid content such as a liquid material, which has good preservability of the content and is lightweight. It is not bulky, easy to dispose of after use, and has a spout and handle on the top of the bag with excellent shape retention,
The filled bag has excellent self-sustainability and the bag capacity is 1
Even if it is relatively large like L to 2L, it is easy to hold,
Easy to handle and carry, easy to hold contents by hand when transferring contents to another container, easy to transfer, safe and easy to transfer contents to the end, bottle The present invention has an effect of providing a self-standing bag that can be suitably used not only as an alternative container but also as a refill container.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of a first embodiment of a self-supporting bag of the present invention.

FIG. 2 is a front view showing the configuration of a self-standing bag according to a second embodiment of the present invention.

FIG. 3 is a front view showing the configuration of a third embodiment of the self-standing bag of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Wall film 2 Bottom film cutout part 3 Bottom film folded part 4 Gusset part 5 Bottom seal part 6 Side seal part 7 Enlarged seal part 8 Bag holding hole 9 Handle part 10 Upper seal part 20 Spout 21 cap 22 adhesive base 100, 200, 300 self-standing bag

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Ageo 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. 3E064 AB25 BC18 EA12 EA23 EA30 FA04 FA05 FA06 HJ01 HK10 HS04

Claims (2)

[Claims] 1. A lower portion of a bag is formed between a lower portion of a front and rear wall film and a gusset portion in which a bottom film is folded inward and inserted and a peripheral portion is heat-sealed. Portion is formed by heat-sealing the edges on both sides of the front and rear wall film with the side seal portion, and the lower gusset portion is heat-sealed with a seal pattern having a shape that imparts autonomy. An enlarged seal portion for forming a handle portion is provided above the side seal portions on both sides, a hole for holding a bag is provided in the enlarged seal portion, and further, a plastic is provided at an upper central edge portion. A self-standing bag, wherein a spout made of a molded article of the above is joined. 2. The self-standing bag according to claim 1, wherein the hole for holding the bag is formed by a score line partially provided with a connecting portion.