JPS62208361A - Vessel for wound film with acute angle section - 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 [Industrial Field of Application] The present invention relates to a container for unwinding a portion of a wound film with a cutting tool.

[Prior art]

Conventionally, a metal sawtooth blade commonly called a sawtooth has been used as a cutting tool for cutting containers into small portions of rolled film. However, for plastic films, especially those with relatively low tear propagation strength, such as polyvinylidene chloride films, the resheet strip is a safe and excellent cutting tool, as specified in U.S.P. 2,888.181. However, it has been difficult to manufacture for various reasons and has not been put into practical use until now.

In Japanese Patent Application No. 60-58279, the present applicant has disclosed that abrasive grains are firmly adhered to a base material, and the surface of the abrasive grain layer is coated with an adhesive having dry film properties with an elastic limit elongation of 130 to 700%. By doing so, we have proposed a file sheet piece that does not crack when folded and has edges that prevent abrasive grains from falling off even when cut into small pieces to be attached to containers.

[Problem that the invention seeks to solve]

The sawtooth felt rough when touched and could cause injury in some cases. Also, although there is no risk of injury from the file sheet pieces, the rough feel is unavoidable as long as it is a cutting tool. For plastic films, particularly polyvinylidene chloride films and polystyrene films that have low tear propagation strength, there is no need to provide a cutting tool over the entire width of the film as long as fine scratches can be created at the cutting start end.

[Means to solve the problem]

An object of the present invention is to provide a container for a wound film in which the cutting tool is installed at a minimum and the cut is guided straightly. An acute angle part is provided that is parallel to the winding core of the wound film and is longer than the width of the wound film, and a cutting tool is provided at least at both ends of the acute angle part, and the acute angle part is used as a guide part for the propagation of tearing of the film. .

The acute angle portion according to the present invention may be formed by using the ridgeline of the container, the tip of the cover piece, the unwinding opening of the container, or may be provided on the side wall of the container, etc. However, if the container is triangular, the ridgeline portion It is preferable to use it.

The acute angle portion is a portion of 85 degrees or less, preferably 65 degrees to 25 degrees.

Although both sawtooth and file sheet pieces can be used as cutting tools, file sheet pieces are preferred.

The sanding sheet piece is made by firmly adhering abrasive grains to a base material such as cloth or paper using a strong adhesive such as a thermosetting adhesive. Examples of the adhesive include resol type phenolic resin, epoxy resin, melamine resin, polyurethane resin, and urea resin. For adhesion, it is desirable that the abrasive grain layer is one layer, and that approximately 1/3 to 2/3 of the abrasive grains are buried in the adhesive layer, and that a portion of each particle protrudes from the adhesive layer. . The base material is not particularly limited, but a flexible one is easy to stick when folded and is easy to fit into the container. When using paper, the flexibility is 5~
30cm/15mm, preferably 10-20cm/1
5 mm (according to JIS P-8143).

Preferably, the substrate is gravure printed prior to applying the adhesive.

The abrasive grains may be alundum, silicon carbide, or other ordinary abrasive grains, and the maximum grain size is about 500 μm.

The file sheet piece is a piece in which the part of the abrasive grains bonded to the base material that protrudes from the adhesive layer is further covered with a thin adhesive layer that remains elastic even after drying. Therefore, even if this file sheet piece is attached to the ridgeline of a container such as a paper box or folded in half, no cracks will occur in the file sheet piece. Since the coating adhesive has fluidity during application, even if it is applied uniformly, the tip of the abrasive grain tends to be coated thinly and the base thereof tends to be coated thickly. Therefore, the tip of the abrasive grain still maintains a sharp shape and does not affect the cutting function. The adhesive for coating has an elastic limit elongation of 130 to 700% at room temperature, preferably 150 to 500%,
More preferably, it has a dry film characteristic of 180 to 400%, and examples thereof include SBR, NBR, polyvinyl chloride rubber, polyvinyl acetate rubber, natural rubber, and polyurethane.

The sanding sheet piece is obtained by locally applying an adhesive to a base material using a printing technique such as intaglio printing or letterpress printing, and embedding abrasive grains thereon in a single layer. Abrasive grains do not adhere to areas where adhesive is not applied, and if the central part is cut, a piece of file sheet with an edge is obtained, and the cutting blade does not wear out rapidly and the abrasive grains do not fall off. By arranging the portions to which no adhesive is applied in a grid pattern in the vertical and horizontal directions, a file sheet piece having a rectangular or square border can be obtained.

Further, it is desirable that the abrasive grains be locally applied to the file sheet pieces so as to represent striped, lattice or other patterns or letters.

[Effect]

The present invention provides a cutting tool at both ends of an acute angle part of a wound film container, and after making a scratch on the edge of the film, the acute angle part is used as a guide part for tear propagation of the film, thereby preventing the cut part from sliding sideways. This allows you to cut exactly horizontally. Furthermore, since the portion where the cutting tool is provided also has an acute angle, the cutting start efficiency is improved.

〔effect〕

According to the present invention, the unpleasant feeling of the cutting tool can be reduced, and the portion of the wound film can improve the cutting effect of the container.

〔Example〕

FIG. 1 is a perspective view of the container of the present invention. l is a container,
Its cross section is a right-angled isosceles triangle. 2 is an end wall surface of a right-angled isosceles triangle, 3 is a bottom surface, and 4 is a back surface, and a front surface 5 is provided in a part of the opening 6 of the box body formed by the end side surface 2, the bottom surface 3, and the back surface 4. Ta.

The rolled film 7 is stored through the opening 6. 8 is a paper tube for the rolled film. 9 is a lid surface that covers the opening 6 and the front surface 5, and 10 is a cover piece extending from the lid surface 9. A file sheet piece 12 serving as a cutting tool was provided on the acute corner 11 where the back surface 4 and the front surface 5 are in contact.

The acute angle portion 11 is 45 degrees. The file sheet pieces 12 are provided at both ends of the acute corner 11, but in use, it is one of the file sheet pieces that actually starts cutting, and the subsequent tear propagation is carried out by the acute corner 11, which does not have a cutting tool, accurately. guided.

The file sheet pieces used in this example were manufactured by the following method.

Flexibility (according to JIS P-8143) is 16c
m/15mm, width 12co+/15nv, weight Bt64
Coated paper with g/lri gravure printing is coated with corundum abrasive grains #120 (JTS abrasive grain size) of approximately 2
It was applied at a rate of 50 g/rd. As an adhesive,
Using a mixture of 100 parts by weight of resol type phenolic resin (solid content 73%) and 20 parts by weight of polyhydric alcohol polyglycidyl ether (solid content 100%),
The adhesive was applied at a rate of 0 g/rrr in a horizontal and vertical grid pattern, leaving the areas where no adhesive was applied, that is, the edges.

Furthermore, a coating adhesive was applied on top of this abrasive grain layer. The coating adhesive used had the following composition.

Modified styrene-butadiene copolymer Latinx (solid content 49%) 100 parts by weight Polyvinyl alcohol (10% solution) 5 parts by weight Melamine resin 5 parts by weight Melamine resin catalyst 0.3 parts by weight Coating amount = 200
g/n? The dry coating properties of this coating adhesive were a 300% modulus of 90 kg/cd and an elastic limit elongation of about 350%.

An enlarged cross-sectional view of the part where the file sheet piece was attached is shown in FIG. 13 is the base material, 14 is the abrasive grain, 15 is the abrasive grain 14 on the base material 13
It is an adhesive that fixes it to the 16 is a coating adhesive, and 17 is an adhesive that is fixed to a predetermined portion of the container.

This file sheet piece 12 did not crack even when attached to the acute corner 11, and exhibited excellent cutting effects.

FIG. 2 shows an example of a container made of a wound film having an equilateral triangular cross section. In this example, a piece of file sheet similar to the example shown in FIG. 1 was used as a cutting tool, but the abrasive grain
4 was not adhered to the entire surface except for the border, but was applied partially in a cotton-like manner. In this case as well, the same effect as in the case of FIG. 1 was obtained.

The shape of the container may also be a diamond shape as shown in FIG. 3 or a triangular cross-sectional shape as shown in FIG. 4.

Further, although a file sheet piece is used as a cutting tool in the embodiment, a conventional sawtooth may be used.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are perspective views showing how a rolled film container having an acute angle part is used, and FIGS. 3 and 4 are sectional views of other containers. FIG. 5 is an enlarged cross-sectional explanatory view when a file sheet piece is used as a cutting tool. In the drawings, 1 is a container, 2 is an end wall surface, 3 is a bottom surface, 4 is a back surface, 5 is a front surface, 6 is an opening, 7 is a winding film, 8 is a paper tube, 9 is a lid surface, and IO is an cover. 11 is an acute corner, 12 is a file sheet piece, 13 is a base material, 14 is an abrasive grain, 15 is an adhesive, 16 is a coating adhesive, and 17 is an adhesive.

Claims (1)

[Claims] In the unwinding and subdividing container for the wound film, an acute-angled portion is provided that is parallel to the core of the wound film and longer than the width of the wound film, and a cutting tool is provided at least at both ends of the acute-angled portion, and the acute-angled portion is used to tear the film. A container for a rolled film having an acute corner that serves as a propagation guide.