JPH11301086A - Method for printing on mold release treating surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deal with printing by respective small amounts having different printing contents without dropping an ink even at the time of printing on a mold release layer by a silicone treatment. SOLUTION: The method for printing on a mold release sheet to manufacture a sticky sheet comprises the steps of forming a flaw 32 arriving at a polyethylene layer 21 according to a scuff by using a water resistant polishing sheet on a mold release layer 31 of one side surface of the mold release sheet in which polyethylene layers 2, 21 are laminated on both side surfaces of a woodfree sheet 1 and silicone mold release layers 3, 31 are respectively provided on the layers 2, 21, and printing on the flaw 32 surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for printing on release paper for transferring an adhesive layer to a substrate of an adhesive sheet.

[0002]

2. Description of the Related Art When manufacturing a pressure-sensitive adhesive sheet, a transfer method is often employed for laminating a pressure-sensitive adhesive layer on a base sheet such as paper, cloth, synthetic resin film, and nonwoven fabric. The transfer of the pressure-sensitive adhesive layer is performed by applying a pressure-sensitive adhesive to the silicone-treated release surface of the release paper to a predetermined thickness, drying and bonding the pressure-sensitive adhesive layer to the base material together with the release paper, and then peeling off the release paper. This is done by:

In some cases, the release paper on which the pressure-sensitive adhesive layer is formed is once wound up as it is, then unwound again and transferred. At that time, since the release property is also required on the back surface of the release paper, the release paper which is usually subjected to release treatment on both sides is used. A lot number for quality control is printed on such release paper. However, since the release layer formed by the silicone treatment has a low energy surface, the ink is repelled even when printing is performed thereon. Even if the repelling is eliminated by improving the solvent of the ink, the ink easily falls off when the printed surface is rubbed because of poor adhesion between the ink and the silicone.

[0004] In order to avoid the above problems, usually printing is first performed on a paper base material, and a polyethylene layer is laminated thereon.
Perform silicone release treatment. However, when the print content is changed by printing in small amounts, such as a lot number, the switching operation is complicated and the manufacturing efficiency is deteriorated, so that it is not possible to cope with the change.

[0005] It is also conceivable to improve the adhesion to ink by performing a corona discharge treatment for printing on the surface of the release layer. Adhesion with ink is certainly improved by corona discharge treatment, but the equipment cost for that is large,
A device for discharging the generated ozone is also required. Further, it is possible to print on the surface of the release layer in a short time by using a laser beam, but in this case, there is a problem that a printed image is less noticeable.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and can cope with small-quantity printing of different printing contents without dropping of ink even when printing on a release layer by silicone treatment. An object of the present invention is to provide a printing method on a release treated surface.

[0007]

The method for printing on a release treated surface of the present invention is a method for printing on release paper for producing a pressure-sensitive adhesive sheet, wherein a polyethylene layer is laminated on both sides of the paper. The release layer on one side of the release paper in which the silicone-based release layer is provided on the polyethylene layer forms a scratch reaching the polyethylene layer by rubbing, and printing is performed on the damaged surface.

[0008] The flaws formed in the silicone-based release layer in the present invention are those having a depth reaching the polyethylene layer in the depth direction. State. Preferably it is 5% or more and 95% or less. If it is less than 2%, a printed image does not clearly appear, and if it exceeds 95%, an attempt to scrape off the release layer consumes more time than necessary, resulting in poor productivity. The area for forming the flaw may be formed only on a portion necessary for printing, not on the entire surface of the release layer.

[0009] As a method of forming a scratch, the release layer is rubbed. Specific examples include a method of rubbing with sandpaper, a metal file, or the like, and a method of contacting a release layer while rotating a roll provided with fibers or a roll provided with fine irregularities at a high speed. It is not limited.

In order to manufacture a pressure-sensitive adhesive sheet by practicing the present invention, a pressure-sensitive adhesive is applied to one side of a release layer of a release paper, followed by drying to form a pressure-sensitive adhesive layer. It is preferable to form a scratch reaching the polyethylene layer on the release layer on the other surface, scrape off part or all of the release layer, and print on the damaged surface.

(Function) A scratch reaching the polyethylene layer by rubbing is formed on the release layer on one side of the release paper provided with the silicone-based release layer, and printing is performed on the scratched surface. Adhesion is improved by contact with the polyethylene layer. Further, ozone is not generated as in the case of the corona discharge treatment.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment) FIG. 1 is a sectional view showing an embodiment of the present invention, in which a pressure-sensitive adhesive sheet is laminated on one side of release paper. Polyethylene layers 2 and 21 having a thickness of 15 μm are laminated on both sides of a high-quality paper 1 having a basis weight of 100 g / m ² as a release paper base material, and a 0.5 μm-thick silicone release layer is formed on the polyethylene layers 2 and 21. Release paper on which 3, 31 were formed was prepared. The adhesive after drying the adhesive on one release layer 3 of the release paper has a thickness of 5
The adhesive layer 5 is formed by coating and drying to a thickness of 0 μm,
An acrylic foam 6 having a thickness of 3 mm was attached to the surface of the pressure-sensitive adhesive layer 5 to form a pressure-sensitive adhesive sheet.

The other release layer 31 surface of the release paper (20c
The area of mx 20 cm) was rubbed by hand 10 times using water-resistant abrasive paper No. 280 specified in JIS R6253 to form a scratch 32 reaching the surface of the polyethylene layer 21. The surface of the scratch 42 was printed with an oil-based ink (oil-based tart stamp ink for plastic, manufactured by Shachihata Co., Ltd.) 4 using a stamp. After the ink had dried, it was rubbed with a finger and the image of the ink remained sharp.

(Comparative Example) Printing was performed in the same manner as in the embodiment except that no scratch was formed on the surface of the release layer. After the ink was dried, it was rubbed with a finger in the same manner as in the embodiment. The printed image was dropped and could not be determined.

[0015]

The printing method on the release treated surface of the present invention is as described above, and a polyethylene layer is laminated on both sides of the paper.
Since a scratch reaching the polyethylene layer is formed by rubbing on the release layer on one side of the release paper in which the silicone-based release layer is provided on the polyethylene layer, and printing is performed on the damaged surface, the silicone-treated release layer is used. Even if printing is performed on the printer, it is possible to cope with printing in small amounts with different print contents without dropping of ink.
Further, ozone is not generated as in the case of the corona discharge treatment.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1: high quality paper 2,21; polyethylene layer 3, 31; release layer 32: scratch 4: oil-based ink 5: adhesive layer 6: acrylic foam

Claims (1)

[Claims] 1. A method of printing on release paper for producing an adhesive sheet, comprising: a polyethylene layer laminated on both sides of the paper; and a silicone-based release layer provided on the polyethylene layer. A printing method on a release-treated surface, wherein a scratch reaching the polyethylene layer is formed on the release layer by rubbing, and printing is performed on the damaged surface.