JPS61291672A - Surface protecting material - Google Patents

Abstract

PURPOSE:To titled material, obtained by coating one surface of a paper base material having a specific delamination strength value or above with an adhesive without causing splitting of the base material in peeling the material for an application surface with a small coating amount of the adhesive without requiring a peeling layer on the back surface. CONSTITUTION:A surface protecting material obtained by coating one surface of a paper base material having >=50g/50mm delamination strength according to JIS P-8139, preferably >=20 sec surface smoothness on the surface coated with the adhesive and <=240 sec on the back surface according to JIS P-8119, e.g. kraft paper or rolled paper, with the adhesive to give 3-50g/m<2> adhesive solid content and form a coating layer.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a surface protection material made by coating one side of a paper base material with an adhesive. To provide a surface protection material that can be peeled off beautifully without causing delamination, does not create minute irregularities on the surface of the adhesive during winding, and does not require an 'Ata layer on the back surface. It is.

2. Description of the Related Art Conventionally available surface protection materials are made by applying a rubber-based or acrylic-based adhesive to one side of a paper base material, and applying a release agent such as silicone to the back side. Items with a release agent coated on the back may be stiff and difficult to adhere, or the release agent may transfer to the adhesive layer and be roughly transferred to the adherend, reducing wettability. In addition, there are drawbacks such as high production costs, and the presence of a release agent layer during pasting makes it impossible to humidify the paper base. ~25 weight r:T
%, the moisture in the paper base material acts on the adhesive during winding, moistens the adhesive or re-emulsifies it, making it difficult to peel it off after it has been applied to the surface. In this case, the adhesive and additives may remain transferred to the surface to be adhered, the adhesive strength may become uneven due to evaporation of water, and an anti-imprinting agent is used to prevent the occurrence of marks, so there are safety concerns. There was a problem. In addition, there were drawbacks such as peeling of the paper base material on the surface of the peeler and a portion of the protective paper remaining on the surface to be pasted, but as a result of various experimental studies, the present inventor has found that such The present invention is thus obtained without any drawbacks.

Problems to be Solved by the Invention The present invention is a surface protection material in which an adhesive is coated on one side of a paper base material, and the paper base material preferably has an interlayer peel strength of 50 g 150 + am or more according to JIS P-8139. is a surface protection material in which the surface smoothness of the paper base material according to JIS P-8119 is 20 seconds or more on the adhesive-coated surface and 40 seconds or less on the back surface opposite to the adhesive/f811J surface.

The uninvented item does not require peeling treatment on the back side, and when the surface protection material is peeled off from the surface to be adhered, the paper base material can be peeled off beautifully without causing peeling, and there is no blocking problem during winding. It is.

Means to solve problems Examples of the present invention will be specifically described below.

Paper bases such as 25-120g/rn' kraft paper, single-gloss raft paper, roll paper, impregnated paper, semi-bleached kraft paper, etc., stored in a regular state yE with an essential content of 3-15% by weight. Rubber system, ethylene-propylene co-adhesive system on the 11th side of the material,
A known pressure-sensitive adhesive such as Acrylic J-type or ethylene-vinyl acetate copolymer system is coated with an appropriate coating device to reduce the solid content of the pressure-sensitive adhesive to 3.
It is used as a surface protection material by coating and layering so that the amount of
-Delamination strength by 8139 is 50g150m11
(with Te, preferably A is the opening () according to JIS P-8119), (Surface smoothness of the material is 20 seconds on the adhesive coated side and 40 seconds or less on the back side. It is the material.

The surface protection material that is rejected has a water content of 15@ψ% or less, and is distributed by winding it up into a predetermined length and packaging it with the adhesive layer as the inner surface.

The surface protection material of the present invention can be applied to synthetic resin plates such as acrylic plates and vinyl chloride plates, stainless steel plates, aluminum plates,
When used as a surface protection material for the surface of an object to be adhered to, such as an alumite metal plate, humidify the surface protection material from the back side of the paper base material by appropriate means, and reduce the water content to 16% just before pasting. ~100%, and is adhered to the surface to be adhered by appropriate means without enclosing air, and after various processing is performed, the surface protection material is peeled off and removed at M'1-Th.

Effects of the Invention The present invention is a surface protection material using a paper base material with a delamination strength of 50 mm or more according to JIS P-8139. When removing A#, the paper base material does not create an interlayer 'A port', so it can be removed cleanly without any part of the paper base material remaining on the surface to be adhered, and Preferably, JIS P-811
The surface smoothness according to 9 is 20 seconds on the adhesive coated surface, and the paper base material with the back surface smoothness of 40 seconds or less is used, so the adhesive coated surface is smooth and the adhesive is Also, since the surface smoothness is small at 40 seconds or less for a 1m back, there is no blocking even in the absence of a release agent layer.It is easy to humidify the surface of the object to be pasted. It can be attached beautifully to.

In addition, if a paper base material with a surface strength equal to or higher than JIS P-8129 (TAPPI standard method) is used, the anti-blocking effect will be greater, and if the size is 3-position type H, the adhesiveness will be greater. A suitable surface protection material was obtained using only a small amount of agent.

In addition, the interlayer peel strength according to JIS P-8139 is 5.
If a paper base material of 0g150mm or more is used, the surface protection material may peel off from between the layers when unwinding, or when the surface protection material is peeled off from the 6th side. AS may occur, and part of the adhesive and paper base material may remain on the adhesive surface, making it impossible to obtain a beautiful surface.
The surface smoothness of the adhesive coated surface by P-8119 is 2.
If the time is 0 seconds or less, the amount of adhesive applied must be increased, and if the surface smoothness of the back surface is 40 seconds, the peelability of the back surface will be poor and it will block during winding and peel off easily. It cannot be rewound.

Example Examples and comparative examples are shown below.

As Example 1, the base paper basis weight was 40 g/rrf, the moisture content was 12% by weight, the interlayer peel strength was 200 g/150 mm according to JIS P-8139, and the JIS
The surface smoothness of the adhesive coated surface by P-8119 is 24
At 0 seconds, the surface smoothness of the back surface is 8 seconds, and the surface strength is l.
O. A surface protection material was obtained by applying 8 g/m' of an acrylic adhesive to the adhesive-coated surface of single-gloss kraft paper with a size degree of 8 seconds.

Furthermore, as Example 2, the surface smoothness of the adhesive coated side was 35 seconds and the surface smoothness of the back surface was 30 seconds using kraft paper with a basis weight of 50 g/rn', and the other surface was the same as in Example 1. Obtained protective material.

Further, as Comparative Example 1, a surface protection material was obtained which had an interlayer peel strength of 20 g and 150 mm, and was otherwise the same as in Example 1.

Furthermore, as Comparative Example 2, the surface smoothness of the adhesive coated surface was 1.
The surface smoothness of the back surface was 80 seconds after 5 seconds, and the rest were as in Example 1.
A similar surface protection material was obtained.

The above-mentioned Example 1.2 and Comparative Example 1.2 were evaluated for blocking properties during winding, bonding properties, and peelability from the non-adhered surface, and the evaluation results are shown in Table 1.

Table 1 The surface protection material according to the present invention had good blocking properties during winding, bonding properties, and peelability from the surface of the adhered object. Delamination occurred when the adhesive was peeled off from the surface.

In addition, when the back surface smoothness was 80 seconds, blocking occurred during winding.

Claims (1)

[Claims] A surface protection material comprising a paper base material coated with an adhesive on one side, the paper base material having an interlayer peel strength of 50 g/50 mm or more according to JIS P-8139.