JPH0431478A - Laminated sheet having interposed processed piece coated with self-adhesive on both side - Google Patents

Abstract

PURPOSE:To expand the difference in peelability between two pieces of release paper which are provided on both sides of a processed piece coated with a self-adhesive on both sides for protecting the coated sides by embossing one of the two pieces of release paper. CONSTITUTION:Release paper 3 is provided on one of self-adhesive layers 2, 2' which are formed on both sides of a processed piece 1 after shape arrangement by punching. Also, embossed release paper 4 comprising a smooth material similar to that of the release paper 3 is provided on the other self-adhesive layer side 2'.

Description

[Detailed Description of the Invention] [Field of Industrial Application] In the present invention, a workpiece coated with adhesive on both sides is used as an adhesive member by pasting it on an adherend, so both sides of the workpiece are coated with release paper. Concerning a laminated sheet with adhesive protection.

[Prior art] Conventionally, a processed piece coated with adhesive on both sides is used as a medium material for bonding two types of materials.
Release paper is applied to each of the front and back adhesive surfaces of the processed piece as a protective layer for the adhesive surfaces to form a laminated sheet for use. When using this laminated sheet, first peel off the release paper on one side, and stick the exposed adhesive side to one of the adherend material sides. Next, the other release paper that remains covering the adherend surface is peeled off, and the newly exposed adhesive surface is applied to the second adherend material surface to complete the bonding.

When the two release papers used in the above-mentioned laminated sheet are of the same type or similar, the intervening processed piece adheres to the surface of each release paper with approximately the same peeling force. Not all of the processed pieces are necessarily peeled off from the surface of the release paper that is peeled off first, and it is possible that only a portion of all the processed pieces stick to the surface of the release paper that is peeled off first, or that all of the processed pieces are peeled off at once. . For this reason, it is necessary to prepare a release paper whose peeling force is weaker than that of other release paper surfaces to be peeled off first.

[Problems to be Solved by the Invention] In the conventional technology, as mentioned above, it is necessary to use release papers with different peeling forces on both sides, so manufacturers of such laminated sheets have to When obtaining paper, it is necessary to specify two different types, or if the company performs the peeling process, it is necessary to adjust the peeling forces of both peeling surfaces to predetermined values. These factors cause manufacturers to double the number of products in stock and increase their technical burden.

Furthermore, even after manufacturing, the state of peeling force changes from the initial setting condition during product storage due to the influence of room temperature, humidity, lamination pressure, etc. during processing, and accidents often occur that prevent smooth peeling in the order.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to always produce all processed pieces from one release paper without being affected by the environmental conditions during processing. is peeled off uniformly, there is no increase in the number of raw materials in stock, and
The present invention aims to provide a laminated tape with a double-sided adhesive type piece interposed therebetween, which can simplify the technique for adjusting the peeling force of release paper.

[Means for Solving the Problems] In order to achieve the above object, the laminated sheet in which the double-sided adhesive type L piece of the present invention is interposed is coated with a machine on the surface of the release paper on the side where the peeling force is desired to be kept small. By adding irregularities to the surface, the contact area between the two pieces is reduced, and the peeling force is apparently reduced.

[Example] The laminated sheet of the present invention will be described with reference to the drawings regarding an example. FIGS. 1 and 2 are schematic longitudinal cross-sectional views showing an example of the structure of the laminated sheet of the present invention.

The work piece 1 of the adhesive sheet with the double-sided adhesive type work piece interposed therebetween as shown in FIG. ing. Release papers 3 and 4 are pasted to protect the adhesive surface of each of the processed pieces until just before use, and moderate pressure is applied to form a laminated sheet.

The adhesive sheet with the double-sided adhesive processed piece in Figure 2 is made by pasting release paper on both sides of the double-sided adhesive sheet corresponding to the raw material of the two sheets and laminating them under appropriate pressure. A laminated sheet is formed by performing half punching and shaping to form a laminated sheet with a work piece l interposed therebetween. Therefore, the second
The diagram is structurally and functionally identical to Figure 1 (although there is no difference in shape, the release paper 3' does not cover the entire sheet like the release paper 3, but only covers the adhesive layer 2). become.

The release paper 3, 3' to be attached to the adhesive layer 2 is a commonly used material that has been adjusted to have an appropriate peeling force for the adhesive layer 2.2', and is used with a smooth surface. The release paper 4 to be attached to the adhesive layer 2° is a release paper 3.3' or a similar smooth material with irregularities added thereto. Therefore, only the vicinity of the top of the convex surface of the uneven surface 5 of the release paper 4 comes into contact with the adhesive layer 2', so the contact surface area is significantly reduced, and the peeling force at the contact portion is microscopically 1!
Even if the peeling force is approximately the same as the peeling force on the side of 1lllI1 paper 3.3゛, the apparent peeling force per total contact surface of the adhesive layer 2° decreases the upper peeling force approximately in proportion to the contact area, and It becomes possible to create a large difference in peeling.

The method of imparting unevenness to the release paper 4 is as long as it can impart unevenness with approximately constant amplitude, such as an embossing method by passing it through an embossing roll or a corrugating method using a corrugator roll.
Both are available. Because of these, the contact portion with the adhesive layer is uniformly distributed over almost the entire surface in the form of points or lines, which is convenient for adjusting the peeling force and provides sufficient stability for practical use. Also, when adding unevenness,
It is also possible to create diagonal unevenness by using a surface processing roll such as a helical tooth. When the shape of the work piece is complex, by changing the direction of the unevenness in this way, it is also possible to adjust the effect of contact with the adhesive layer.

Furthermore, by applying the above-mentioned unevenness processing, the above-mentioned stability is further enhanced since the release paper is also characterized in that it can be peeled off gradually from the edges when peeled off.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

Protecting the adhesive side of a processed piece with adhesive applied on both sides 2
Since one of the sheets of release paper is provided with irregularities, it is possible to achieve a stable release difference using the same type of raw material. Manufacturers of the laminated sheet can produce products with stable quality and reliable peeling during the processing process without increasing the number of products in stock.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional views showing an example of the structure of an M-layer sheet with a double-sided adhesive workpiece of the present invention interposed therebetween. 11. Processed piece, 2.2', Adhesive layer, 3.3°4
．． Release paper, 42. Release paper, 51. uneven surface

Claims (1)

[Claims] A double-sided adhesive characterized by pasting a release paper with a smooth release surface on one side of a processed piece made by applying adhesive on both sides, and pasting release paper with unevenness on the entire release surface on the other side. Laminated sheet with molded pieces interposed.