WO2010007848A1

WO2010007848A1 - Method for producing bag-shaped container

Info

Publication number: WO2010007848A1
Application number: PCT/JP2009/060846
Authority: WO
Inventors: 藤田　紫; 俊文棚橋; 石坂　公一
Original assignee: 東洋製罐株式会社
Priority date: 2008-07-17
Filing date: 2009-06-15
Publication date: 2010-01-21
Also published as: JP2010023309A

Abstract

Film (1) formed into a tubular shape by inflation molding is collapsed flat and the opposite edges (1a, 1a) thereof are cut off along the feeding direction to obtain a base-material original fabric (2) consisting of two long film materials which are bonded tightly on the inner surfaces. The original fabric is rolled up to them use one film material as a protective layer (2a), and the other film material as an inner surface layer (2b), and an original fabric (3) for bag making is produced by laminating an outer layer material (2c) on the inner surface layer (2b). A bag is then made from the original fabric (3) for bag making while the protective layer (2a) is peeled such that the surface from which the protective layer (2a) is peeled is kept inside. When a bag-shaped container is produced using tubular film produced by inflation molding, the film can be rolled up without trouble even in the middle of the production process.

Description

Manufacturing method of bag-like container

The present invention relates to a method for manufacturing a bag-like container formed by bag-making a flexible material such as a resin film.

Conventionally, a bag-like container (pouch) manufactured by bag-making a flexible material such as a resin film is known. This type of bag-like container is widely used for storing various articles in various fields. Some of these are used for applications that require a high level of cleanliness, such as pharmaceuticals and precision electronic components. In this case, the content of foreign matter such as dust It is desirable to prevent contamination of things.
For this purpose, it is conceivable to manufacture the bag-like container in a clean room where the air cleanliness is controlled, but the work space where all the manufacturing processes from film formation to bag making are performed is a clean room. Therefore, it is difficult to manage the environment, and the manufacturing cost increases, which is not preferable.

Thus, for example, Patent Document 1 proposes that a molded synthetic resin blown film is used as a base film, and the inside of the blown film is made into a bag shape with the blown films in close contact with each other. . Manufacturing a bag-like container in this way is said to be effective in preventing foreign matter from adhering or mixing during film forming or container manufacturing.

JP 11-48384 A

By the way, there is not so much problem when a series of steps of flatly crushing an inflation-formed tube-like film and laminating a barrier film or the like to form a bag into a bag shape is performed.
However, the present inventors have conducted extensive studies from the viewpoint of manufacturing efficiency, and as a result, each of the inflation molding process, the lamination process, and the bag making process is performed separately, and the intermediate product manufactured in the previous process is processed. When it took up the roll in the form of a roll and tried to transfer it to the subsequent step, it came to the knowledge that there was the following problem.

That is, when flatly crushing an inflation film formed into a tube shape, it is difficult to sufficiently crush the folded portions at both ends, and the thickness at both ends increases. For this reason, when winding this in a roll shape, winding unevenness or winding deviation is likely to occur, and it becomes difficult to wind it with high accuracy. Such winding unevenness and winding deviation greatly affect the feed accuracy of the original fabric, and affect the yield of the final product. And such a problem becomes so remarkable that winding length is lengthened.

The present invention has been made on the basis of the above-described knowledge, and in manufacturing a bag-like container using a tube-shaped film formed by inflation, it is wound into a roll during the manufacturing process. However, it aims at providing the manufacturing method of the bag-shaped container which does not have trouble in winding.

The manufacturing method of the bag-like container according to the present invention is a long shape in which both inner surfaces are in close contact by crushing a resin film formed into a tube shape by inflation molding flatly and then cutting off both end edges along the feeding direction. After winding up into a roll as a base material consisting of two film materials, while rolling out the base material, one film material is used as a protective layer, and an outer layer material is laminated on the other film material side. It is a method for making a bag-making raw fabric, with the surface from which the protective layer is peeled facing inward, while peeling off the protective layer.

According to the present invention, which is such a method, the base material made by flatly crushing a resin film formed into a tube shape is cut off at both end edges whose thickness has been increased. It can be done without hindrance. And when making a bag-making original made by laminating an outer layer material on such a base material, foreign matter such as dust, bacteria, and mold do not adhere to the protective layer until just before bag making. Thus, a bag-like container having a high cleanliness on the inner surface of the container can be produced industrially and stably.

It is explanatory drawing which shows 1 process of embodiment of the manufacturing method of the bag-shaped container which concerns on this invention. In embodiment of the manufacturing method of the bag-shaped container which concerns on this invention, it is a schematic sectional drawing explaining the process until the original fabric for bag making is formed. It is explanatory drawing which shows 1 process of embodiment of the manufacturing method of the bag-shaped container which concerns on this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Inflation molding process]
Drawing 1 is an explanatory view showing one process of a manufacturing method of a bag-like container concerning this embodiment. In the present embodiment, first, the resin material melt-kneaded by the extruder 10 is extruded in an annular shape from a circular die 11 attached to the tip of the extruder 10.

As the resin material used at this time, a material having heat sealability is used because it forms the inner surface layer 2b of the bag-like container 4 produced by the method as described later. For example, polyolefin resins such as low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, and ethylene-vinyl acetate copolymer can be suitably used. Also, these resin materials preferably do not contain additives so that the additives will not bleed out and contaminate the contents.

Also, a nozzle 12 is provided in the center of the circular die 11, and high pressure air is blown from the nozzle 12 to expand the molten material that has been pushed out from the circular die 11 in an annular shape. Thereby, the film 1 formed into a tube shape is created. The high-pressure air blown at this time is cleaned by passing it through an air filter so that foreign matter such as dust, bacteria, and mold do not adhere to the inner surface of the film 1. Further, the film 1 is cooled on its inner surface side by high-pressure air, while its outer surface side is cooled by being in contact with the cooling ring 13.

Thereafter, the film 1 is sandwiched between the pinch rollers 15 while being flattened while being guided by the guide plate 14, and is sent to the cutting unit 20 through the guide rollers 16 and the like. When the film 1 sent to the cutting part 20 passes through the cutting part 20, both

end edges

1a and 1a are cut off along the feeding direction (see FIG. 2A), and both end edges 1a are cut off. , 1a are wound around the winding roll 21, respectively.
2A is a schematic cross-sectional view showing a cross section orthogonal to the feeding direction before cutting off both end edges 1a from the film 1, and both end edges 1a are cut off along the chain line shown in FIG. 2A. It is.

Thereby, a base material 2 made of two long film materials whose inner surfaces are in close contact with each other is created. This base material 2 is wound up by the winding roll 16 in a roll shape and conveyed to the next step. At this time, since the both ends edge 1a whose thickness increased when the base material 2 is crushed flat is cut off, the winding can be performed without hindrance, and uneven winding and misalignment hardly occur. ing.

[Lamination process]
Next, in the present embodiment, while feeding the base material 2 wound in a roll shape as described above, one film material is used as a protective layer 2a, and the other film material is used as an inner surface layer 2b (see FIG. 2 (b)), an outer layer material 2c is laminated on the inner surface layer 2b side to produce a bag-making raw fabric 3 (see FIG. 2 (c)). At this time, the two film materials constituting the base material 2 are equivalent, and which is the protective layer 2a and which is the inner layer 2b is arbitrary.
2B is a schematic cross-sectional view showing a cross section orthogonal to the feeding direction of the base material 2, and FIG. 2C is a cross section orthogonal to the feeding direction of the bag making original 3. It is a schematic sectional drawing shown.

The specific means for laminating the outer layer material 2c on the inner layer 2b side of the base material 2 is not particularly limited. For example, while extruding the resin forming the adhesive layer between the inner layer 2b side of the base material 2 and the outer layer material 2c, these may be sandwiched between the cooling roll and the nip roll and bonded together. . Moreover, you may make it adhere | attach after apply | coating an adhesive material to either the both of the lamination | stacking surface of the inner surface layer 2b side of the base material fabric 2, and the outer-layer material 2c, or both.

Various materials can be used as the outer layer material 2c depending on the performance required for the bag-like container 4 as the final product. For example, when the outer layer material 2c is formed as a barrier layer, a cyclic olefin resin film, a polyester resin film, a polyamide resin (nylon) film, an aluminum foil, a silica-deposited polyester film, an alumina-deposited polyester film, and ethylene-vinyl alcohol A polyester or nylon film coated with an organic resin such as a polymer (EVOH) film, a polyvinylidene chloride film, vinylidene chloride, or an acrylic acid resin can be suitably used.
Such an outer layer material 2c may be a single layer, or may have a multilayer structure by combining a plurality of materials. Further, as the adhesive, polyurethane adhesive, vinyl acetate adhesive, acid-modified olefin resin, acid anhydride-modified polyolefin resin, and the like can be used.

[Bag making process]
Next, the bag-shaped container 4 is manufactured by bag-making the bag-making raw fabric 3 prepared as described above. In this embodiment, the roll 3a that has wound up the bag-making raw fabric 3 is set in a bag-making machine, and while the raw material for bag-making 3 is fed out, the contents are filled and bag-making is performed simultaneously. Although this is demonstrated, it is not limited to this. For example, the bag forming raw material 3 prepared by laminating the outer layer material 2c on the base material 2 is supplied to the bag making machine as it is, and the lamination process and the bag making process are continuously performed. Also good.
In addition, FIG. 3 is explanatory drawing which shows an example which manufactures a bag, drawing | feeding out the raw material 3 for bag making from the roll 3a.

In the example shown in FIG. 3, the bag-making raw fabric 3 from which the protective layer 2 a has been peeled is wrapped around the content filling cylinder 30 with the surface from which the protective layer 2 a has been peeled inward, and the back sticking seal device 31 is The sticker seal is heat sealed. Then, the contents are supplied from the contents filling cylinder 30, and the bag-like container 4 filled with the contents is made by cutting a predetermined position while being heat-sealed and sealed by the seal cutting device 32. It has become so.

Thus, in this embodiment, the bag-making raw fabric 3 fed out from the roll 3a is bag-made while peeling the protective layer 2a, with the surface from which the protective layer 2a has been peeled facing inward. Thus, the inner surface layer 2b is protected by the protective layer 2a until just before the bag is made, and foreign matter such as dust, bacteria, and mold can be prevented from adhering to the inner surface layer 2b. Then, the bag-making raw fabric 3 is made with the surface from which the protective layer 2a is peeled off as the inside. Thereby, the bag-like container 4 having a high cleanliness on the inner surface of the container can be produced industrially and stably.
Note that the peeled protective layer 2 a can be reused as a raw material for the film 1. Further, in the above-described inflation molding step, both

end edges

1a and 1a cut off from the film 1 can be reused as raw materials for the film 1 as well.

Here, in order to obtain a highly clean pouch-like container 4, the above-described bag-making process can be performed, for example, in a class 100 clean room. In addition, the entire bag making process is performed in a clean room having a medium cleanliness (for example, about class 1000), and after the protective layer 2a is peeled off, Only the section until the heat sealing is performed may be performed in a booth with higher cleanliness.

Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

For example, in the embodiment described above, an example in which the bag-like container 4 is made while filling the contents in the bag-making process has been shown, but the bag-like container 4 is made in a state where a part is opened. Alternatively, after filling the contents, the opening may be sealed by heat sealing. Further, the bag-like container 4 may be made while attaching an extraction member called a spout used for this type of bag-like container, and the contents may be filled from the extraction member.

Further, the specific form of the bag-like container 4 can be various forms such as a gusset type provided with a town on the side surface and a bottom formed with a self-supporting bottom. Furthermore, according to the specific form of the bag-like container 4, a plurality of bag-making raw fabrics 3 may be bonded together to form a bag, and these are pasted while cutting the bag-making raw fabric 3. You may make it make a bag together.

The above-described method for manufacturing a bag-like container according to the present invention can be used as a method for manufacturing a bag-like container that is widely used for storing various articles in various fields.

DESCRIPTION OF SYMBOLS 1 Film 2 Base material 2a Protective layer 2b Inner surface layer 2c Outer layer material 3 Original material for bag making

Claims

As a base material made of two long film materials whose inner surfaces are in close contact with each other by cutting both ends along the feed direction after flattening the resin film formed into a tube shape by inflation molding After winding up into a roll,
While feeding out the base material, one film material is used as a protective layer, and the outer film material is laminated on the other film material side to obtain an original material for bag making,
Thereafter, while peeling off the protective layer, the bag-making raw fabric is made with the surface from which the protective layer has been peeled facing inward.