JPH07126586A - Adhesive tape manufacturing method - Google Patents

Abstract

(57) [Summary] [Purpose] Even with a high-viscosity adhesive, the adhesive does not remain in the cells of the gravure plate cylinder, and it can be applied to the base material sheet with a uniform thickness, providing stable high adhesive strength. An object of the present invention is to provide a method for producing an adhesive tape, which enables efficient production of an adhesive tape having [Structure] Cells 5, 5, ... With a plate depth of 25 μm are formed by engraving on a copper plating 2 on the surface of an iron roll 1, a ceramic coat 3 is applied to the plate surface, and polytetrafluoride is applied to the ceramic coat 3 surface. The peeling treatment layer 4 is provided by coating and drying an emulsion of ethylene and baking it at 230 ° C. An acrylic resin emulsion (viscosity 8000 cps, solid content 54%) as an adhesive was supplied to the gravure plate cylinder, the excess adhesive was scraped off with a doctor blade, and applied on a polyethylene terephthalate substrate having a thickness of 40 μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an adhesive tape.

[0002]

2. Description of the Related Art In order to manufacture a pressure-sensitive adhesive tape, as a method for applying an organic solvent solution of a pressure-sensitive adhesive to the surface of a base sheet, there is a method using a normal gravure plate cylinder as well as a method using a gravure plate cylinder. (Kaihei 1-173147). The gravure plate cylinder used is one in which a roll surface of a copper-plated iron core is engraved and then chrome-plated to improve printing durability. When a gravure plate cylinder is used, the concentration of the pressure-sensitive adhesive is set to a low viscosity of 500 to 800 cps in order to improve transferability to the base sheet.

[0003]

In order to apply the organic solvent solution of the adhesive to the base sheet using the gravure plate cylinder, the adhesive filled in the small cells on the surface of the gravure plate is entirely covered with the base sheet surface. If not, the thickness of the applied adhesive becomes thin and the thickness of the adhesive layer becomes uneven.
Further, the pressure-sensitive adhesive left in the cells is gradually solidified, and the thickness of the pressure-sensitive adhesive layer tends to be more uneven. Therefore, it is necessary to transfer all the adhesive in the cell to the base sheet.

Therefore, the concentration of the pressure-sensitive adhesive is set to the low viscosity as described above. However, if you try to increase the coating thickness of the adhesive in order to increase the adhesive strength, it is necessary to deepen the engraving of the plate, and the thickness of the undried adhesive that has been applied will be large, so drying after application It takes a long time in the process,
The production efficiency becomes poor.

On the other hand, when the concentration of the pressure-sensitive adhesive is increased, it becomes difficult for the pressure-sensitive adhesive to separate from the cell, and when the plate surface separates from the base material sheet, the pressure-sensitive adhesive is stretched between the surface of the base material sheet and the surface of the base material sheet. If it is dried so far, the thickness of the pressure-sensitive adhesive layer becomes non-uniform.

The present invention solves the above-mentioned conventional problems, and even a high-viscosity adhesive can be applied to a base sheet with a uniform thickness without leaving an adhesive in the cells of the gravure plate cylinder. An object of the present invention is to provide an adhesive tape manufacturing method capable of efficiently producing an adhesive tape having stable and high adhesive strength.

[0007]

The method for producing a pressure-sensitive adhesive tape of the present invention is a method for producing a pressure-sensitive adhesive tape, which comprises applying a pressure-sensitive adhesive to one surface of a base sheet using a gravure plate cylinder, and drying the pressure-sensitive adhesive. The method is characterized in that the pressure sensitive adhesive is applied using a gravure plate cylinder obtained by peeling.

The substrate sheet used in the present invention includes:
Examples thereof include synthetic resin sheets such as vinyl chloride, polypropylene, and polyester, paper such as kraft paper, glassine paper, high-quality paper, and non-woven fabric.

Examples of the peeling treatment on the surface of the gravure plate cylinder include a treatment in which an emulsion of a fluororesin polymer is applied and dried on the surface of the gravure plate cylinder, and then baked. Examples of the fluorine-based resin polymer include polytetrafluoroethylene, polytrifluoroethylene, and polyvinylidene fluoride.

Adhesives used are acrylic type, rubber type,
There are silicone type, and they are used as an organic solvent solution or as an aqueous dispersion type emulsion. As for the viscosity when the above-mentioned pressure-sensitive adhesive is applied to the base sheet by the gravure roll, those having a viscosity of 500 to 800 cps, which has been conventionally used, can be used, and further, it is as high as 3000 to 30000 cps. A viscous material can also be used.

According to the present invention, even when the high-viscosity adhesive is applied to the gravure plate cylinder as described above, the surface of the gravure plate cylinder is subjected to a peeling treatment. It can be applied without leaving any adhesive inside the cell of the body. Therefore, the thickness of the adhesive becomes uniform. Further, since the viscosity is high and the ratio of the solvent and the dispersion medium is smaller than that of the conventional one, the thickness of the pressure-sensitive adhesive can be increased, and thus a strong pressure-sensitive adhesive force can be obtained. Moreover, since the drying time is short, the production efficiency can be increased.

[0012]

[Function] Since the surface of the gravure plate cylinder to which the adhesive is applied is subjected to a peeling treatment, even if the adhesive has a high viscosity, the adhesive does not cause stringing, and the adhesive is placed in the cell of the gravure plate cylinder. Can be applied without leaving. Therefore, the thickness of the pressure-sensitive adhesive layer is uniform and the pressure-sensitive adhesive force is stable. Further, since a high-viscosity pressure-sensitive adhesive can be applied, the thickness of the pressure-sensitive adhesive layer can be increased, which can increase the adhesive strength. Furthermore, since the content ratio of the solvent and the dispersion medium is low, it is possible to accelerate the drying of the pressure-sensitive adhesive and increase the production efficiency.

Further, when an adhesive having a large thixotropic property is used, it becomes possible to form an adhesive layer having unevenness on the surface, and an adhesive tape from which air can easily escape from the adherend during application. You can

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view showing a part of a gravure plate cylinder used in the present invention. The copper plating 2 on the surface of the iron roll 1 has cells with a plate depth of 50 μm in a circle having a diameter of 5 mm. A pattern pattern in which the circles are engraved with 175 lines and the circles are arranged side by side in a square shape at intervals of 2 mm is formed, the plate surface is provided with the ceramic coat 3, and the surface of the ceramic coat 3 is made of polytetrafluoroethylene. Apply the emulsion and dry it.
The release treatment layer 4 is provided by baking at 0 ° C.

Acrylic resin emulsion as a pressure-sensitive adhesive (trade name: Cybinol AT-2 manufactured by Saiden Chemical Co., Ltd.)
2, viscosity 8000 cps, solid content 54%) was supplied to the gravure plate cylinder, the excess adhesive was scraped off with a doctor blade, and applied to a polyethylene terephthalate substrate having a thickness of 40 μm.

After the pressure-sensitive adhesive was applied to the base sheet, no pressure-sensitive adhesive remained in the cells, and the pressure-sensitive adhesive was entirely applied to the base sheet. The pressure-sensitive adhesive is dried in a drying oven at 110 ° C to give a thickness of 20.
An adhesive tape having an adhesive layer of μm was obtained. The pressure-sensitive adhesive layer had a uniform thickness and high adhesive strength.

Since almost no adhesive remains on the drum surface of the gravure plate after the coating work, cleaning of the drum surface can be completed in an extremely short time.

Comparative Example A pressure sensitive adhesive was applied to a base sheet in the same manner as in Example except that the drum surface of the gravure plate was not subjected to peeling treatment. However, the pressure-sensitive adhesive did not separate from the plate cylinder surface, and the pressure-sensitive adhesive became a string between the plate cylinder surface and the base sheet, and after drying, a part with a small thickness of the pressure-sensitive adhesive layer was generated and the thickness was uneven. became. Also, since the adhesive remains in most of the cells, it took a long time to clean the plate cylinder surface.

[0019]

EFFECTS OF THE INVENTION The method for producing the pressure-sensitive adhesive tape of the present invention is configured as described above, and even if it is a high-viscosity pressure-sensitive adhesive, the pressure-sensitive adhesive does not remain in the cells of the gravure plate cylinder and is applied to the base sheet with a uniform thickness. In addition, since the content ratio of the solvent and the dispersion medium is low, the pressure-sensitive adhesive can be dried quickly, and the pressure-sensitive adhesive tape having a stable and high adhesive force can be efficiently produced. Moreover, cleaning of the gravure plate cylinder after the coating operation can be completed in a short time. Furthermore, when a pressure sensitive adhesive having a high thixotropic property is used, it becomes possible to form a pressure sensitive adhesive layer on the surface, which makes it possible to obtain a pressure sensitive adhesive tape from which air can be easily released from the adherend during application.

[0020]

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of a gravure plate cylinder used in the present invention.

[Explanation of symbols]

 1: Iron roll 2: Copper plating 3: Ceramic coat 4: Peeling treatment layer 5: Cell

Claims (1)

[Claims] 1. A method for producing an adhesive tape, which comprises applying a pressure-sensitive adhesive to one surface of a base material sheet using a gravure plate cylinder, and drying the pressure-sensitive adhesive, using a gravure plate cylinder whose surface has been subjected to a release treatment. A method for producing an adhesive tape, which comprises applying an agent.