JPS62122920A - Mouth expansion method of sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention Object of the Invention (Technical Field) The present invention relates to a method for manufacturing a bag-like container and a method for filling the bag-like container. to form a container, or
This relates to a method for expanding the end face of a close-fitting sheet or film (hereinafter collectively referred to as a sheet) consisting of two facing sheets manufactured in close contact with each other to fill a bag-like container without a boat with contents. It is.

(Prior Art) Conventionally, in order to form a bag-like container having a boat from a close-fitting sheet consisting of two opposing sheets manufactured in close contact with each other, that is, in order to insert a boat part between the sheets, sheets are used. The adhesion between the sheets can be weakened by mixing additives into the material of the sheets or dispersing them between the sheets, or by embossing the adhesion surfaces of the sheets. Then, the end surface of the sheet was peeled off using a suction disk from the outside, or air was blown between the two sheets to widen the opening and the boat parts were inserted.

In addition, when the purpose is not fully achieved by the above method, that is, when the adhesion between the sheets is strong and it is difficult to expand the opening of the sheets, when the sheets that have been in close contact with each other are peeled off and then the sheets are overlapped, or When stacking the individually formed sheets, the boat was set in place so that the shape would be the same as when inserted.

On the other hand, a method similar to the above is also used when opening the mouth of a bag-like container without a boat when filling it with contents.

However, packaging materials for foods, medical/pharmaceutical products, precision electronic components, etc. tend to be reluctant to have unnecessary additives mixed into or attached to the package contents, and furthermore, packaging materials from the outside of the packaging material tend to be undesirable. Transparency, which allows the contents to be more clearly confirmed, is also increasingly required, so in some cases the former method cannot be adopted. Therefore,
The latter method was adopted out of necessity, but since the inner surface of the bag-like container is exposed over a wide area and for a relatively long time during the manufacturing process, it is easy for foreign matter to get mixed in or adhere to the final product. As mentioned above, it was necessary to control dust in the manufacturing process. Moreover, packaging for medical/pharmaceutical products and precision electronic parts, which is extremely sensitive to dust, was still unsatisfactory, and there was a need for a packaging system with a high degree of cleanliness. Therefore, the present invention attempts to solve the problems of the conventional products. That is, the present invention aims to provide a means for realizing a packaging system in which the contents of the package are not contaminated with chemical substances unnecessarily. The object of the present invention is to provide a means for realizing a packaging system that is difficult to mix. A further object of the present invention is to provide means for realizing a packaging system for transparent packaging containers.

To describe the problem to be solved by the present invention in more detail, it provides a method for expanding the opening of a close-contact sheet consisting of two opposing sheets that are manufactured in close contact using raw materials that do not contain additives more than necessary. There is a particular thing. Another object of the present invention is to provide a method for widening a close-fitting sheet consisting of two opposing sheets that are produced in close contact with each other using a molding method that prevents foreign matter from entering or adhering to the inner surface of the packaging material. Another object of the present invention is to provide a method for expanding the opening of a close-fitting sheet consisting of two facing sheets that are produced in close contact with each other to produce a transparent packaging container.

Here, the close-fitting sheet consisting of two facing sheets that are manufactured in close contact with each other may be formed so that the surfaces that will become the inner surface of the bag-shaped container in the future are in close contact with each other. It includes cases where the sheet is substantially one sheet, such as a sheet, and also includes cases where the sheet is layered immediately after extrusion molding or calender molding.

Structure of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned objectives, the present inventors have developed a method for expanding the opening of a close-fitting sheet consisting of two facing sheets manufactured in close contact with each other. After careful consideration, we found that the periphery of the cut end of the sheet was pressed against a flat plate, and a wedge-shaped opening tool was applied to the unfixed end of the sheet, approximately at the center of the end, that is, the contact surface, and the two sheets were separated. It has been found that by pressing the mouth between the sheets, even if the sheet has strong adhesion, it is possible to easily and reliably obtain a small open end surface that will trigger the mouth to widen. Therefore,
Upon further confirmation, we discovered that the angle of the tip of the wedge-shaped tool does not need to be as sharp as it should be, but that the open end surface can be reliably obtained only at a certain range of angles that are not very sharp. This discovery led to the present invention.

That is, by pressing the wedge-shaped opening tool, one of the sides forming the wedge of the wedge-shaped opening tool that is not parallel to the flat plate pushes open the sheet end surface on the side other than the flat plate side of the sheet in the opening direction. At the same time, since the other side slides between the sheets parallel to the contact surface, the wedge-shaped opening tool can easily enter between the sheets, and for this reason, the angle of the tip of the wedge-shaped tool is The fact that it is not too sharp makes it possible to obtain a more reliable opening.

Generally, when widening the sheets, especially when the adhesion between the sheets is strong, one of the two sheets, 1
Once a small opening that serves as a trigger for separating one sheet 12 from the other sheet 12 is obtained, various methods can be easily considered for expanding the opening.

In other words, the method of forming the small opening 5 described above can be said to be a novel opening widening method for opening the cut end surfaces of two opposing sheets that are manufactured in close contact with each other.

However, the inventors of the present invention have further studied the above-mentioned opening method and a method of efficiently utilizing the small opening 5 to widen the chain-wheel-shaped opening. After pushing the wedge-shaped opening tool into the sheet, the position where the wedge-shaped opening tool is pressed against the flat plate around the cut end of the sheet is changed, and the wedge-shaped opening tool is pushed between the sheets. The inventors have discovered that an opening large enough to use a tool can be easily obtained, leading to the present invention.

That is, the present invention provides a method for opening a cut end surface of a close-contact sheet or a film made of two opposing sheets manufactured in close contact with each other, in which the periphery of the cut end surface of the sheet at least opens the sheet. The wedge-shaped opening tool is pressed and fixed to the flat plate with a gap wider than the width of the tip of the wedge-shaped opening tool and substantially perpendicular to the end surface, and the wedge-shaped opening tool is pressed and fixed to the unfixed end surface of the sheet. The tip of the wedge-shaped opening tool is held such that one side of the wedge is parallel to the flat plate, and the distance between the wedge and the flat plate is approximately the thickness of one sheet.
This is a method of widening a sheet or film in which opening is triggered by abutting the end surface from a direction substantially perpendicular to the end surface and pushing the sheet between the two sheets.

The present invention also provides that after the wedge-shaped opening tool is pushed between two sheets by the above method, both sides of the wedge-shaped opening tool are fixed to the flat plate of the sheet so that the gap becomes wider. This is a method for expanding the opening of a sheet or film, which is characterized by changing the width of the sheet or film, and further pushing a wedge-shaped opening tool between the sheets to widen the opening.

(Specific Description of Configuration) The present invention will be specifically described below with reference to the drawings.

Figures 1 to 3 show a front view, an elevation view, and a perspective view showing the initial positional relationship of the principle mechanism, and are made from two opposing sheets 11 and 12 that are manufactured in close contact with each other. The periphery of the cut end surface 14 of the adhesive sheet 1 is the tip 22 of the wedge-shaped opening tool 2 for opening the sheet.
is pressed and fixed onto the flat plate 3 by the pressing tool 4 with a gap d wider than the width e and substantially perpendicular to the end surface 14, and on the unfixed end surface 15 of the sheet,
The wedge-shaped opening tool 2 is held such that one side 21 constituting the wedge is parallel to the flat plate 3 and the distance C between the wedge-shaped opening tool 2 and the flat plate is approximately the thickness of one sheet. As shown in FIG.
The sheet is abutted from a direction substantially perpendicular to the sheet and pushed into the gap between the two sheets, that is, into the contact surface 13, thereby forming a small opening 6 that triggers the opening.

Furthermore, as shown in FIG. 5, after the wedge-shaped opening tool 2 is pushed between two sheets in the above-described manner, both sides of the wedge-shaped opening tool 2 are fixed to the flat plate 3 of the sheet 1. is moved so that the gap d becomes wider (the gap after changing the position is referred to as d' for convenience), and the wedge-shaped opening tool 2 is pushed between the sheets, which is generally used for opening the mouth. The chain wheel shaped opening 6 is enlarged so that a pin or a chuck can be easily inserted and used.

In order for the mouth widening method of the present invention to be adopted efficiently, it is preferable that the material of the mouth widening sheet is a flexible plastic, and in particular, it is preferable that the plasticizer has a strong adhesion between the sheets. A salt containing from 100 parts by weight to 100 parts by weight, preferably from 35 parts to 60 parts by weight of DOP (when using the mouth expander of the present invention on hibinyl resin or a vinyl chloride resin having equivalent flexibility). It is effective.

Further, the wall thickness of the sheet is such that one sheet, that is, one sheet has a wall thickness of 5 μm to 2 mm, preferably 20 μm to 1 mm.
The reason for this is that as the thickness of the sheet becomes thinner, precision around the wedge-shaped opening tool 3 is required, which cannot be met in terms of equipment, that is, equipment accuracy and equipment cost. If the sheet has a large wall thickness, the opening widening method according to the present invention can be adopted, but the final objective of the present invention is to
This is because the significance of this method as a mouth opening method for manufacturing bag-like containers or filling bag-like containers will be diminished.

In particular, the sheet that is mentioned as a material in which the present invention functions meaningfully and efficiently satisfies the above conditions.
It is an inflation sheet.

The reason for this is that it is easy to prevent foreign matter from entering the inner surface during the sheet forming stage.

Furthermore, the equipment requirements for carrying out the present invention are as follows.

First, the width d of the tip of the wedge-shaped opening tool is 10 mm or less, preferably 3 mm or less, and the angle a of the tip of the wedge-shaped opening tool is 20° or more and 80° or less, preferably 30°. The angle is greater than or equal to 60°. The reason for this is that the wider the width of the tip of the wedge-shaped opening tool, the more precision is required around the wedge-shaped opening tool 3, which cannot be accommodated with equipment. , 30° or less and 60° or more, the reliability of gradual opening decreases.

Second, the sheet end surface d that is not pressed and fixed against the flat plate
The length is longer than the width of the tip of the wedge-shaped opening tool plus the length of the two sheets, and shorter than the length of 10 mm 7J [I]. This is because if it is shorter than the above range, the wedge-shaped opening tool cannot be pushed between two sheets, and if it is longer, the reliability of opening, especially for thin sheets, decreases.

(Examples) The present invention will be described in more detail below based on Examples.

A mouth widening tool having the dimensions shown in FIG. 6 was prepared and used in the following examples. In addition, materials that do not contain special additives such as lubricants for openings shown in Table 1, such as vinyl chloride resin (PVC), polyethylene resin (
PE), polypropylene resin (PP), polyester resin (PET), etc., to produce an inflation sheet in which opposing surfaces of the dimensions shown in the table are tightly adhered and molded.
This was cut in a direction perpendicular to the winding direction and used as a sample for the mouth expansion experiment.

Table 1 Sheets used in the examples Next, the sheets were placed in a mouth opening tool without being set to the various dimensional conditions shown in the examples in Table 2, so that the sheet end surface was perpendicular to the direction of movement of the wedge-shaped opening tool. In the first step, a small opening was opened, and in the second step, the chain wheel-like opening was expanded to a larger opening. The periphery of the cut end surface of the adhesive sheet 1 consisting of sheets 11 and 12 is wider than the width e of the tip of the wedge-shaped opening tool 2 for opening the sheet, and is substantially perpendicular to the end surface 14. It is pressed and fixed onto the flat plate 3 with a gap d by the pressing tool 4, and on the unfixed end surface 15 of the sheet,
The wedge-shaped opening tool 2 is held such that one side 21 constituting the wedge is parallel to the flat plate 3 and the distance C between the wedge-shaped opening tool 2 and the flat plate is approximately the thickness of one sheet. The tip 22 of the wedge is abutted from a direction substantially perpendicular to the end surface 15 and pushed between the two sheets to form a small opening 6 that triggers the opening; The fixing of the sheet 1 to the flat plate 3 on both sides of the wedge-shaped opening tool 2 is changed so that the gap d becomes wider, and the wedge-shaped opening tool 2 is then pushed between the sheets, generally used for opening the mouth. The operation of enlarging the chain wheel-like opening 6 to a size that allows easy insertion and use of the bottle or chuck was performed 10 times, and the success rate was examined. The results shown in Table 3 were obtained.

(Effects of the Invention) As described above, the present invention improves the accuracy of the opening tool because it is sufficient to slide the wedge-shaped opening tool onto the end face of the sheet that is pressed and fixed against the flat plate while maintaining a constant distance from the flat plate. It is easy to take out the sheet, and furthermore, even if the sheet is thin or has a strong adhesive force, a chain wheel-shaped opening can be easily and reliably obtained. Furthermore, even when a chain wheel-shaped opening is to be further enlarged, if the method of the present invention is adopted, the wedge-shaped opening tool that has already been pushed in is simply pushed further in the same direction, so the accuracy of the opening tool can be improved even when opening a small opening. Table 2: The mouth opening used in the example can be adjusted in the same manner as when opening it, and the accuracy of the opening m tool may be disrupted. This method is easy and stable, and furthermore, it is possible to widen a small opening very easily.

[Brief explanation of drawings]

1 and 3 are a front view and a perspective view showing the initial positional relationship of the principle mechanism of the mouth widening method of the present invention, and FIG. 2 is a view taken along arrow A-A' in FIG. It is. Also, the fourth
5 and 5 are perspective views sequentially showing the principle mechanism of the mouth widening method of the present invention. Further, FIG. 6 is a perspective view of a mouth widening tool used in an embodiment of the mouth widening method of the present invention. 1: Close contact sheet 2: Wedge-shaped opening tool 3: Flat plate 4: Pressing fixing tool 5: Wedge-shaped opening tool fixing jig 6: Small opening 11: Seat 12: Sheet 13: Close contact surface 14: Sheet end surface 15 : Sheet end surface 21 that is not pressed and fixed: One side 22 forming the wedge: Tip a of the wedge-shaped opening tool: Angle C of the tip of the wedge-shaped opening tool: Distance from the flat plate d: Substantially perpendicular to the end surface 14 Gap e: Width of wedge-shaped opening tool 2

Claims (8)

[Claims] (1) In a method of opening the cut end face of a close-contact sheet or film consisting of two facing sheets manufactured in close contact with each other, the periphery of the cut end face of the sheet is at least suitable for opening the sheet. The wedge of the wedge-shaped opening tool is pressed and fixed against a flat plate with a gap wider than the width of the tip of the wedge-shaped opening tool and substantially perpendicular to the end surface, and the wedge of the wedge-shaped opening tool is pressed against the unfixed end surface of the sheet. The tip of the wedge-shaped opening tool, which is held so that one constituting side is parallel to the flat plate and the distance from the flat plate is approximately the thickness of one sheet, is held substantially against the end surface. A method of widening a sheet or film in which the opening is tightened by pressing the sheet or film between the two sheets at a right angle. (2) In a method of opening the cut end face of a close-contact sheet or film consisting of two opposing sheets manufactured in close contact with each other, the periphery of the cut end face of the sheet is at least suitable for opening the sheet. The wedge of the wedge-shaped opening tool is pressed and fixed against a flat plate with a gap wider than the width of the tip of the wedge-shaped opening tool and substantially perpendicular to the end surface, and the wedge of the wedge-shaped opening tool is pressed against the unfixed end surface of the sheet. The tip of the wedge-shaped opening tool, which is held so that one constituting side is parallel to the flat plate and the distance from the flat plate is approximately the thickness of one sheet, is held substantially against the end surface. After pressing the wedge-shaped opening tool from a right angle direction and pushing it between the two sheets, the positions of the wedge-shaped opening tool fixed to the flat plate of the sheet are changed so that the gap becomes wider, and then the wedge-shaped opening tool is A method for expanding the opening of a sheet or film, which comprises pushing a tool between the sheets to expand the opening. (3) The mouth widening method according to claim 1 or 2, wherein the material of the sheet or film to be widened is flexible plastic. (4) The soft plastic is a vinyl chloride resin containing 25 parts by weight to 100 parts by weight, preferably 35 parts to 60 parts by weight of DOP as a plasticizer, or a vinyl chloride resin having equivalent flexibility. The mouth widening method according to claim 3, characterized in that: (5) The thickness of one sheet or film to be expanded is 5 μm to 2 mm, preferably 20 μm to 1 mm.
Mouth expansion method described in section. (6) The width of the tip of the wedge-shaped opening tool is 10 mm or less, preferably 3 mm or less, and the angle of the tip of the wedge-shaped opening tool is 20° or more and 80° or less, preferably,
The mouth widening method according to claims 1 to 5, characterized in that the angle is 30° or more and 60° or less. (7) A patent characterized in that the length of the end surface of the sheet that is not pressed and fixed against the flat plate is longer than the width of the tip of the wedge-shaped opening tool plus the length of the two sheets, but shorter than the length of the width of the wedge-shaped opening tool plus 10 mm. A mouth widening method according to claims 1 to 6. (8) The mouth widening method according to claim 4, 5, or 7, wherein the sheet or film to be widened is formed by inflation molding.