JPS61217189A - File sheet piece having hem - 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] [Field of Application of the Invention] The present invention involves wrapping films such as plastic film, aluminum foil, glassine paper, etc. and pasting them onto a container, and cutting these films at any desired location. related to safe cutting tools that can be used.

[Prior art]

For films with relatively low tear propagation strength, such as plastic films, file sheet strips are a safe and excellent cutting tool, according to USP 2,88.
Although it was disclosed in No. 8,181 and has been known for a long time, it has not been put into practical use until now. This is due to the following reason.

+l) Since the rolled film is mainly used for food-related products, if the abrasive grains fall off during cutting, the abrasive grains themselves will remain unhygienic, even if there is no hygiene problem. What was needed was something that was free from the fear of

(2) Therefore, the adhesion of abrasive grains must be strong, and simple methods such as applying adhesive and scattering abrasive grains on top of it, or printing a mixture of adhesive and abrasive grains are possible. However, the adhesion is insufficient and the abrasive grains may fall off, making it unusable.

(3) As a strong bonding method, it is desirable to use a strong adhesive and embed part of the abrasive grains in the adhesive.

(4) It is difficult to use the full-scale method described in (3) to manufacture small-sized file sheets, and it is necessary to use techniques for manufacturing wide-area file sheets such as so-called abrasive cloth or abrasive paper. No.

(51 (41) It was virtually impossible to cut abrasive cloth or paper manufactured using full-scale technology into small pieces. This is because the abrasive grain material itself is extremely hard. Yes, the cutting edge is worn out, and there is no punching blade that can withstand use, and even if it is cut, the abrasive grains will break and fall off due to the impact.Even if they do not break, the abrasive grains will stick together. Because the abrasive grains are embedded in the adhesive, the abrasive grains at the extreme end become unstable, and the mutual stability is lost, making it easy for the abrasive grains to fall from the edge. It is theoretically impossible to cut it.

(6) Furthermore, although these cutting tools using abrasive grains are provided on the outer wall of a wound film container, the cutting effect is significantly increased if a file sheet is pasted across the ridgeline of the container.

However, conventional abrasive cloths and abrasive papers cannot withstand bending of about 90 degrees, and cracks occur in the adhesive layer, making it easy for abrasive grains to fall off.

[Problem that the invention seeks to solve]

As mentioned above, in order to manufacture file sheet pieces, it is necessary to cut the file sheet manufactured by a full-scale method that firmly adheres the abrasive grains, and there is no way to cut the file sheet without the risk of the abrasive grains falling off. It was wanted. Furthermore, there was a need for a file sheet piece that would not crack from the base material to the abrasive grain layer even when bent.

[Means for Solving the Problem] and [Operation] The present invention aims to solve the above-mentioned problems, and has a structure in which abrasive grains are bonded to one side of a base material, and the abrasive grains are attached to the peripheral edge of the base material. A small piece of a sheet-like file with an unbonded edge, where the surface of the abrasive grains has an elastic limit elongation of 130 to 700%.
It is characterized in that it is coated with an adhesive having dry film properties. In other words, the abrasive grains are partially adhered to the surface by leaving unattached portions of the abrasive grains in a horizontal and vertical lattice pattern, and the attached abrasive grain layer is coated with an adhesive having a high elastic limit elongation. It is something that can be done.

According to this method, if the part where the abrasive grains are not attached is cut approximately in the center, it is possible to use a knife to cut the part, and there is no wobbling of the abrasive grain layer at the cut part, and even if the part is bent, there will be no cracks. No abrasive particles or abrasive particles fall off.

The present invention will be explained in detail below.

The file sheet piece according to the present invention can be applied to a base material such as cloth or paper.
Abrasive grains are firmly bonded 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. . There are no particular limitations on the base material, but a flexible one is easy to apply when folded and is compatible with the container.

When using paper, the flexibility is 5-30cm/15mm,
Preferably 10-20cm/15mm (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 360 μm.

In the file sheet piece according to the present invention, the portion 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 to an angle of 90 degrees or more, no cracks will occur in the file sheet piece. Since the coating adhesive has fluidity when applied, even if it is applied uniformly, the tip of the abrasive grain tends to be coated thinly and the base part tends to be coated thickly. Therefore, the tip of the abrasive grain still maintains its sharp shape and does not affect the cutting function. The adhesive for coating has an elastic limit elongation rate of 13 at room temperature.
It has a dry film characteristic of 0 to 700%, preferably 150 to 500%, more preferably 180 to 400%, such as SBR, NBR, polyvinyl chloride rubber, polyvinyl acetate com, natural rubber, Examples include polyurethane.

The sanding sheet piece of the present invention is obtained by locally applying an adhesive to a base material using a printing technique such as flexographic 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. If you arrange the areas without adhesive in a horizontal and vertical grid, you can create a rectangle.
Alternatively, pieces of file sheet with square edges are obtained.

〔effect〕

According to the present invention, it is possible to industrially manufacture a file sheet piece used as a cutting tool for a rolled film container, and it is possible to make any curved surface, flat surface, or pointed end, including ridge lines, into a file surface. Therefore, it can be attached to any part to improve the cutting effect, and there is no risk of abrasive grains falling off. Furthermore,
Since it has a border, when pasting it on a predetermined part, it has the effect of making positioning easy and accurately pasting it, and also prevents abrasive grains from falling off at the cut part of the file piece without damaging the punching blade.

〔Example〕

Flexibility (according to JIS P-, 8143) is vertical 16
crn/L5mm.

Width 12cm/15mm, weight 64g/n? Corundum abrasive #120 on coated paper with gravina printing.
(JIS abrasive particle size) was applied at a rate of about 250 g/m.

As an adhesive, resol type phenolic resin (solid content 7
Using a mixture of 100 parts by weight of 3%) and 20 parts by weight of polyhydric alcohol polyglycidyl ether (solid content 100%), the parts where no adhesive is applied in a vertical and horizontal grid pattern at a rate of about 80 g/m, That is, it was applied leaving a border.

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 latex (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/rr? The dry coating properties of this coating adhesive were 300% modulus of 90 Kg/cTA and an elastic limit elongation of about 350%.

In this example, an acrylic acid ester adhesive layer was further provided on the back surface of the base material, and a silicone-treated release paper was adhered to the surface of the glassine paper.

FIG. 1 is a cross-sectional view of a file sheet piece having a border obtained according to this example. 1 is a base material, 2 is an adhesive applied to the back surface thereof, and 3 is a release paper.

Abrasive grains 5 were fixed to the surface of the base material 1 with an adhesive 4. 6
is a portion to which no adhesive has been applied, that is, a portion that will become a border, and therefore no abrasive grains 5 are attached. 7 is a coating adhesive layer provided on the abrasive grain layer. FIG. 2 is a plan view of this file sheet, and a file sheet piece having a border was obtained by cutting along a cutting line 8 shown by a broken line in the center of the border 6.

Peel off the release paper 3 on the back side of this file sheet piece, and remove the ridge line 1 of the plastic film paper box 9 as shown in FIG.
I pasted it across 0. 11 is a plastic film. FIG. 4 is an enlarged sectional view of the file sheet piece stuck on the ridgeline 10. As can be seen in Figure 4, the file sheet piece according to the present invention does not crack even when folded, so the abrasive grains stick to the ridgeline portion where cutting efficiency is highest, creating a discontinuous linear cutting blade on the ridgeline. Form. By rubbing the cutting start end of the wound film against this blade, the end of the film is torn, and by propagating this tear along the ridgeline, the wound film can be cut reliably and safely.

FIG. 5 shows another embodiment in which a piece of file sheet is placed along the ridge line 10.
It was attached along the entire length. It is also possible to apply abrasive grains locally, such as with a file sheet.

Furthermore, the sanding sheet piece may not be attached to the paper box of the rolled film in advance, but may be attached at the time of use. In this case, it is advisable to make a mark to indicate the part of the paper box where the sanding sheet piece should be attached.

[Brief explanation of drawings]

Figure 1 is a sectional view of the file sheet before it is cut into pieces with edges, Figure 2 is a plan view of Figure 1, Figures 3 and 5.
The figure is a perspective view showing the state in which the file sheet piece is stuck to the paper box of the rolled film, and FIG. 4 is an enlarged sectional view of FIG. 3. In the drawings, reference numeral 1 is a base material, 2 is an adhesive, 3 is a release paper, 4 is an adhesive, 5 is an abrasive grain, 6 is a border, 7 is a coating adhesive, 8 is a cutting line, 9
1 is a paper box, 10 is a ridgeline, and 11 is a plastic film. Patent applicant: Asahi Kasei Industries, Ltd. Figure 1 Figure 2

Claims (2)

[Claims] (1) A small piece of a sheet-like file in which abrasive grains are adhered to one side of a base material, and a border portion where no abrasive grains are adhered to the periphery is provided, and the surface of the abrasive grains has an elastic limit elongation rate. is 13
A piece of sanding sheet having an edge coated with an adhesive having a dry film property of 0 to 700%. (2) A small piece of a sheet-like file in which abrasive grains are adhered to one side of a base material, and a border portion where no abrasive grains are adhered to the periphery is provided, and the surface of the abrasive grains has an elastic limit elongation rate. is 13
A file sheet piece coated with an adhesive having a dry film characteristic of 0 to 700%, and having a border formed by pasting a release paper on the back side via an adhesive.