JPH10129681A - Gusset bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pouch which is in the form of a gusset bag for steady refill free of an overflow of a fluid and also has the ability to support itself, by having an easy-to-open part at the end of a neck and by forming reinforcement heat seals on the outsides of the folds of the body, shoulder, and neck of the gusset bag. SOLUTION: In a gusset bag made by folding, either a top or bottom is provided with shoulders 3 that become gradually thinner from a body 4, and a neck 2. At the end of the neck 2 an easy-to-open part 8 is formed, and also reinforcement heat seals 9 are formed on the periphery of the outsides of the folds of the body 4, shoulders 3, and neck 2 of the gusset bag. Therefore, a package body 10 filled with a fluid and hermetically sealed has the ability to support itself with the aid of a flat bottom 20 and reinforcement heat seals 9. Further, a discharging part 1 can be opened by being torn from a V-shaped notch 8, and, without being caused to flow outside, the contents can be filled into the opening 21 of a container 20 to be used. Eventually, the contents is squeezed out with the discharging part 1 inserted in the opening 21 of the container 20, and the container 20 is refilled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple pouch, especially a gusset bag, which is provided with a portion for supplying contents for refilling to a container which is repeatedly used after packaging a powder, liquid or viscous material, and which is easy to dispose. Belongs to.

[0002]

2. Description of the Related Art Conventionally, liquid detergents, cleansers, emulsion pastes, and the like are filled in containers (hereinafter, referred to as used containers) such as plastics, glass, metals, composite cans and bottles having shape retention properties. For distribution and use.
The used container has been disposed of.

[0003] Conventionally, used containers having shape-retaining properties have a tendency to consume resources, and the ratio of container cost cannot be ignored. From this point of view, the so-called refilling, in which the same contents are refilled into used containers after the contents have been consumed after filling the contents in a low-cost simple container, is not only from a price point of view but also from a resource saving point of view. Is also being promoted.

A package used for a simple refillable container is a pouch-shaped standing pouch (self-standing bag) made of a soft packaging material such as a laminated film, or a gusset bag or a bag-making bag having a large filling capacity compared to the area of a film used. A pillow-shaped three-side seal bag (hereinafter referred to as a pillow bag) having excellent properties has been provided. Pouches made of soft packaging materials have the drawback that they are less rigid than conventional containers and are inferior in shape retention.However, the protection of contents against chemical changes in contents depends on the composition of the material film. You can choose. In addition, a material filled in a pouch shape, which consumes less material and is lightweight, has a small total capacity and can contribute to a reduction in distribution costs.

A standing pouch made of a soft packaging material requires two types of films in the manufacturing process,
There is a manufacturing complexity such as performing special processing for standing on the bottom, which is not always preferable in terms of productivity. In addition, since the gusset bag and the pillow bag do not have autonomy, there is a problem that the contents are easily spilled when opened. A common problem with refill pouches using a soft packaging material is that, because of lack of rigidity, when opened, the fluid content is pushed out of the pouch and overflows, or is refilled into a container for use. There is a problem that the contents that flow out sometimes do not match the opening of the container, so that refilling cannot be performed smoothly.

In order to solve such a problem, the corner of the upper seal portion of a relatively expensive standing pouch is cut very small to form a pouring portion, and the contents of the fluid are discharged. From some departments, it was refilled into used containers.

[0007] However, when the refill opening of the container to be used is small, it is difficult to keep the pouch discharge section in the above-mentioned opening in a stable state, and the pouch discharge section moves during refilling. There was a problem that the outflowing fluid overflowed.

[0008]

When refilling the contents of a conventional pouch by simply making the spout small, utilizing the shape of a relatively productive and low cost gusset bag, and reopening the contents after opening. Create a refill pouch with its flow rate adapted to the filling part of the container used, prevent the pouring part from moving during refilling, and have a stable refillable gusset bag shape that does not overflow with fluid, and It is an object of the present invention to provide a pouch having both independence.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a gusset bag in which the inner surface of the gusset bag is folded inward at a position opposed to the flow direction of a tubular body having heat sealability. In one of the upside and downside, the shoulder portion and the neck portion are gradually narrowed from the trunk portion, and the end portion of the neck portion has an easy-opening treatment portion, and the trunk portion, the shoulder portion, and the neck portion of the gusset bag. Is a gusseted bag provided with a reinforced heat seal portion in the outer folded portion of FIG. The heat sealing portion of the tubular body is a heat sealing portion facing the same surface of the end portion of the single-layer or multilayer film, and is provided in the middle of the reinforcing heat sealing portion of the neck portion. Gusseted bag. Further, the gusset bag is formed of a single-layer or multilayer blow film.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gusset bag of the present invention is shown in FIGS.
As shown in the figure, in the gusset bag formed by folding inward at a position opposed to the flow direction 12 of the cylindrical body made of the packaging film 11 having an inner surface heat sealing property, and making the folded bag, either the top or bottom A shoulder portion 3 and a neck portion 2 which become thinner in order from the body portion 4. The easy-opening treatment portion 8 is applied to the end of the neck portion 2, and the body portion 4, the shoulder portion 3 and the neck portion of the gusset bag are provided. A gusset bag 10 in which a reinforcing heat seal portion 9 is provided around an outer bent portion 13 of the portion 2. The easy-opening treatment section can perform a so-called magic cut or the like by laser processing in addition to the usual V-shaped or I-shaped notch (notch).

The formation of the tubular body (heat sealing) may be performed by so-called gas-sticking performed on the same surface of the sheet-like film, or by so-called envelope bonding performed on the front and back sides. Also,
The tube-attached heat seal portion 7 can be shared with the reinforcing heat seal portion 9 as shown in FIG. The term “flow direction” as used in the present invention means the direction in which a machine travels when processing such as film formation and lamination.

According to a second aspect of the present invention, the heat sealing portion (single-sealing seal) in which the tubular heat seal portion 7 forming the tubular body is opposed to the same surface of the end portion of the single-layer or multilayer film 11 is provided.
In addition, as shown in FIGS. 4 and 5, the heat seal portion is a gusset bag provided in the middle of the reinforcing heat seal portion 9 of the neck 2. In particular, magic cutting by laser processing is a method that effectively acts on cutting the heat seal portion 7 serving as a knob.

Although not specifically shown, the gusset bag according to the third aspect of the present invention is a seamless single-layer or multi-layer blown film (an inflation film) which does not have the tube-sealed heat seal portion 7 for forming a cylindrical body. ).

The wrapping film constituting the gusset bag of the present invention may have any one of heat sealing properties, ultrasonic sealing properties, high frequency sealing properties, etc. A multilayer film composed of laminated films having properties can be used.

The single-layer film includes polyvinyl chloride, polyvinylidene chloride, polyamide, polyester, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic ester copolymer, There are films made from ionomers and the like. The thickness of the film is selected from those having a strength of the gusset bag of 20 to 300 μm according to the material and the application.

The multilayer film is a composite film of a base film having strength and various barrier properties and a heat-sealing film. For example, the base film is a stretched or unstretched film of a thermoplastic resin such as polyester, polyamide, polypropylene, or saponified ethylene / vinyl acetate copolymer. And the thickness of the base film is 10-50 μm rigidity, heat resistance,
It is appropriately selected from those suitable for workability.

The base film is laminated with a metal foil such as aluminum for the purpose of improving its various barrier properties,
A barrier material such as vinylidene chloride (a vinylidene chloride-acrylic acid ester copolymer having a high vinylidene chloride ratio) or polyvinyl alcohol is coated on the above-mentioned base film, or aluminum, aluminum oxide, or silicon oxide is used. In addition, a processed film in which an inorganic thin film layer such as indium oxide, tin oxide, and zirconium oxide is formed can be used.

As a method for forming an inorganic thin film, there are a vacuum deposition method such as an ion beam method and an electron beam method, and a sputtering method. The thickness of the inorganic thin film layer is preferably from 10 to 200 nm, although it depends on the material thereof. In the present invention, the thickness is preferably from 20 to 150 nm. If the thickness of the thin film layer exceeds 200 nm, cracks may occur, which not only lowers the barrier property but also increases the amount of material used and the processing time, which is not preferable.

The heat-sealing film is provided so as to provide heat-sealing property on at least one side of the base film. It is constructed by laminating on both sides of a material film. As a method of lamination, a usual method such as dry lamination, melt extrusion coating, or sandwich lamination in which an adhesive resin layer is formed by extrusion coating can be applied.

The heat-sealing film is made of polyethylene, polypropylene, ethylene / vinyl acetate copolymer,
There are films produced from ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer, ionomer, polybutene, and the like. In particular, it is a linear polyethylene, an ionomer, or an ethylene / vinyl acetate copolymer excellent in low-temperature heat sealability having stable heat sealability and content resistance (eg, stress cracking resistance to a surfactant).

In particular, in the gusset bag of the present invention, since a step is formed between the folded portion of the layer of the gusset bag and the portion heat-sealed with the two layers of the packaging film, a pinhole may be generated due to a missing seal. In such a case, an ethylene / α-olefin copolymer polymerized using a metallocene catalyst having excellent low-temperature heat sealability and hot sealability is preferred. And, by using a material obtained by removing an olefin-based elastomer from the copolymer, the heat fluidity of the heat-sealing film is improved, and an effect of preventing pinholes due to a step is exhibited.

The metallocene-based catalyst is called a single-site catalyst having a uniform active site, unlike a conventional multi-site catalyst having a non-uniform active site. And the copolymer obtained by using this does not produce a low molecular weight (low density) component or a high molecular weight (high density) copolymer as a by-product.
Therefore, the ethylene / α-olefin copolymer obtained using a metallocene-based single-site catalyst can be formed with a narrower molecular weight distribution and composition distribution than those obtained using a conventional catalyst. And it is a heat sealable polyethylene which is excellent in low temperature heat sealability and hot sealability and is effective for the present invention. Specifically, Kernel (trade name of Mitsubishi Chemical Corporation) and Evolu (Mitsui Petrochemical Industry Co., Ltd.)
AFFINITY (US DOW CHEMI)
CAL, trade name, EXACT, ENGAGE (trade name, manufactured by EXON CHEMICAL, USA).

The film forming method may be any of extrusion coating, in addition to the T-die method or the circular die method.
The thickness thereof must be large enough to cover the step between the gusset part (folded part) or tube-sealed heat-sealed part heat-sealed with four layers and the part heat-sealed with the two-layer wrapping film. １５０150 μm is used.

The seamless tubular film used in the present invention 3 may be a single layer made of the above-mentioned thermoplastic resin or a multilayer film with an adhesive resin layer interposed, if necessary. For example, there is a co-extruded multilayer film composed of a single layer of polyethylene, nylon / acid polymer (adhesive resin layer) / polyethylene.

In the gusset bag of the present invention, the fold diameter 2φ of the neck portion including the reinforcing heat seal portion is set to be equal to or slightly smaller than the inner diameter of the opening 21 of the container 20 to be used as shown in FIG. 1 or FIG. , The width of the outflow contents is 2
It should be smaller than 1. It is preferable that the neck part 2 has a folding diameter and a length that allow the neck part 2 to be inserted into the opening part 21 at the time of final squeezing. The width 15 of the gusset bag and the length 16 of the gusset bag are set to a size having an internal capacity and a volume that does not hinder the hermetic seal after filling. And, the folding width 5W of the gusset bag is the folding part 5
They can approach each other to the extent that they do not touch each other. However, if the distance is too close, a step is formed between the four-layer folded portion and the portion to be heat-sealed with the two-layer packaging film, which may cause a pinhole due to missing of the seal. Therefore, it is preferable to leave a gap of 5 mm or more. Similarly, the neck 2 shown in FIG.
In the case where the tube-sealed heat seal portion 7 is provided at the center of the cylinder, the tube-sealed heat seal portion 7 and the reinforcing heat seal portion 9 of the neck portion 2 are provided.
Are set so as to have an interval of 5 mm or more between them.

The inclination of the shoulder 3 from the neck 2 to the trunk 4 shown in FIGS. 2 and 4 is not particularly limited, but is set so that the contents flow smoothly. In the formation of the neck portion 2 and the shoulder portion 3 described above, it is preferable that the reinforcing heat seal portion 9 is heat-sealed in the production of the gusset bag 10 and then cut and cut together with the pouring portion 1. In addition, the reinforcing heat seal portion 9
Does not necessarily have to be completely heat-sealed to the outermost portion, and the two packaging films may be in a state of being almost free, and may simply satisfy the function of the reinforcing seal.

The easy-opening treatment section 8 shown in FIGS. 2 and 4 of the gusset bag of the present invention is provided to facilitate opening of the gusset bag. When the gusset bag is formed, the neck portion is punched and processed at the same time. Also, before that, a hole is formed at a required position in a diamond shape or a line shape, and V is formed when the neck portion is punched. It can be shaped like a letter or I. Also, a magic cut can be made by laser processing to make it easier to cut around the cutting portion.

[0028]

The present invention will be described below in more detail with reference to examples.

(Example 1) Thickness 1 as base film
A 5 μm biaxially stretched nylon film and a 130 μm-thick linear polyethylene film as a heat-sealing film were formed using a polyester and an isocyanate-based two-part curable adhesive, and the packaging film 11 was formed using ordinary dry lamination. Created.

The wrapping film 11 is folded in two by a gusset bag making machine with the heat-sealing film as the inner surface, and the wrapping film 11 is formed into a cylindrical shape as shown in FIGS. A cylindrical body was formed. Further, the heat sealing portion 7 and the reinforcing heat sealing portion 9 are made to coincide with each other by folding plates so as to be symmetrical with respect to the flow direction on the left and right sides while forming the folding width 5W. Heat sealing the outer folded portion 13 and reinforcing the heat seal portion 9
Was gusseted to a width of 5 mm. Further, the shoulder 3, the neck 2 and the pouring portion 1 are formed by heat sealing with a heating mold having the shape of a reinforcing heat sealing portion at the neck and shoulder, and punched together with the V notch 8 by a punching mold. A gusset bag 10 of Example 1 of the present invention shown in FIG. 2 having an unsealed bottom opening 6 having a portion 2, a shoulder 3, a tube-sealed heat seal portion 7, and a reinforcing heat seal portion 9 was prepared. Then, a household detergent is filled from the bottom opening 6 and sealed by heat sealing, and a bottom heat sealing portion 61 is formed with the bottom facing down as shown in FIG. I got the body. Further, the spout 1 is torn from the V-notch 8 to open, and as shown in FIG. 1 (B), the filling portion 21 of the container 20 is filled with the household detergent without overflowing to the outside. The outlet part 1 was inserted into the filling part 21, the contents were squeezed out of the gusset bag, and the contents could be refilled into the used container.

Example 2 The wrapping film prepared in Example 1 was folded in two with a heat-sealable film as an inner surface by a gusset bag making machine so as to form a tubular shape as shown in FIGS. 4 and 5. The cylindrical body was formed by providing the tube-sealed heat seal portion 7 with a heat seal width 71. Further, the tube-sealing heat seal portion 7 is positioned at the center of the neck portion 2, and the left and right sides are folded plates so that the folded portions 5 are symmetrical in the flow direction.
Was formed at a folding width of 5 W, and the end portion of the outer folded portion 13 was heat-sealed so that the reinforcing heat-sealed portion 9 was gusseted so as to have a width of 5 mm. Further, the shoulder 3, the neck 2, and the spout 1 are heat-sealed with a heating type having the shape of the reinforcing heat-sealing portion of the neck and the shoulder, and the magic cut 8 is provided by laser processing. A gusset bag 10 of Example 2 shown in FIG. 4 of the present invention having a neck portion 2, a shoulder portion 3, a tubular heat seal portion 7, and a reinforcing heat seal portion 9 and having an unsealed bottom opening 6 was prepared. Then, from the bottom opening 6, a household detergent is filled in the same manner as in Example 1,
Heat sealing was carried out to provide a bottom heat seal portion 61 and hermetically sealed, and a self-standing package shown in FIG. Further, the pouring section 1 is torn open from the easy-opening treatment section 8, and the opening 21 of the container 20 is filled with the household detergent without overflowing as shown in FIG. By inserting the pouring section 1 into the opening 21, the contents could be squeezed out of the gusset bag and refilled into the used container. In the case of the second embodiment, the tube-sealed heat seal portion 7 located on the neck portion 2 is picked up, and the opening portion 2 of the container 20 is used.
1, so that the position of the spout could be refilled more stably than in the first embodiment.

Example 3 The same procedure as in Example 1 was carried out by using a coextruded multilayer film having a total thickness of 120 μm with nylon, ionomer and linear polyethylene (innermost layer) by the coextrusion multilayer inflation method. As shown in FIGS. 1 to 3, a shoulder 3, a neck 2, and a spout 1 are formed, and are punched out together with a V notch 8 by a punching die to form a neck 2, a shoulder 3, and a reinforcing heat seal portion. A gusset bag of Example 3 of the present invention having a bottom opening 9 and an unsealed bottom opening 6 was made. Then, a household detergent is filled in the same manner as in Example 1,
The package was sealed with a heat seal, and the bottom was turned down. As a result, a self-standing package slightly inferior to that of the embodiment shown in FIG. 1A could be obtained. Further, the spout 1 is torn and opened from the V notch 8, and the opening 21 of the container 20 is filled with the household detergent without overflowing, and the spout 1 is inserted into the opening 21. Then, the contents were squeezed out of the gusset bag, and the contents could be completely refilled in the used container as compared with Example 1.

[0033]

According to the present invention, the gusset bag in which the gusset bag is filled with a fluid such as a liquid detergent for refilling and sealing is self-supporting having a flat bottom portion and a reinforced heat seal portion.
Furthermore, the spout 1 can be opened by tearing off the V-notch, so that the opening of the container can be filled with the household detergent without overflowing. And the contents were squeezed out of the gusset bag and refilled into a container for use. Further, the gusset bag of the second invention can stably position the pouring section at the opening of the container to be used by pinching the tube-sealed heat seal section located at the neck, so that the gusset bag of the first embodiment can be used. The position of the spout could be refilled more stably than in. And the third
In the invention of the above, although the rigidity of the package is inferior, the effect of completely refilling the contents into the container to be used is obtained as compared with the case using the base film.

[Brief description of the drawings]

FIG. 1A is a perspective view of a gusset bag filled with the contents of the present invention. (B) It is a perspective view which shows the state which transfers contents from a gusset bag.

FIG. 2 is a schematic plan view showing a heat seal portion of the gusset bag of the present invention.

FIG. 3 is a schematic view showing an opening of the gusset bag of the present invention.

FIG. 4 is a schematic plan view showing a gusset bag provided with a heat seal portion in the center.

FIG. 5 is a schematic view showing an opening of a gusset bag provided with a heat seal portion in the center.

FIG. 6A is a perspective view showing a state where contents are filled in a gusset bag provided with a heat seal portion in a central portion. (B) It is a perspective view which shows the state which transfers the content of the gusset bag provided with the heat sealing part in the center part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pour out part 2 Neck 2φ Diameter of neck fold 3 Shoulder 4 Body 5 Folding part 5W Folding width of gusset bag 6 Bottom opening 60 Bottom 61 Bottom heat seal part 7 Cylinder heat seal part 71 Cylinder heat seal Width of part 8 Easy opening treatment part 9 Reinforced heat seal part 10 Gusset bag 11 Packaging film 12 Flow direction of cylindrical body 13 Outside bent part 15 Gusset bag width 16 Gusset bag length 20 Container used 21 Filling part of container used

Claims (3)

[Claims] 1. A gusset bag whose inner surface is folded inward at a position facing the flow direction of a heat-sealable cylindrical body, and in a folded gusset bag, a shoulder portion which is gradually narrowed from one side to the other at the top or bottom. And a neck portion, the neck portion having an easy-opening treatment portion, and the gusset bag having a reinforcing heat-sealing portion at a trunk portion, a shoulder portion, and an outer folded portion of the neck portion. Gusset bag. 2. The method according to claim 2, wherein the heat sealing portion of the tubular body has a
The gusset bag according to claim 1, wherein the gusset bag is a heat seal portion facing the same surface of a single-layer or multi-layer film end portion, and is provided in the middle of the reinforcing heat seal portion of the neck portion. 3. The gusset bag according to claim 1, wherein the tubular body is formed of a single-layer or multilayer blow-film.