JPS6031856A - Preparation of fixing heating roll of electronic copier - Google Patents

Abstract

PURPOSE:To easily mold a fixing heating roll not exerting the influence of orange peel to a black solid part, by spray coating liquid curable silicone rubber dissolved in a solvent in a specific thickness at specific density. CONSTITUTION:The periphery of a metal shaft is spray coated with liquid curable silicone rubber dissolved in a solvent to form a silicone rubber surface layer of which the film thickness is 50-300mum and the max. surface roughness is 5mum or less. Concretely, a fixing heating roll is prepared by a method wherein the surface of a metal core having, for example, an outer diameter of 30mm. and a length of 400mm. is treated with an adhesive and rotated at 50rpm by a rotor while a mixture consisting of 100pts. wt. of low temp. curable silicone rubber KE-1300 produced by Shinetsu Chemical Co., Ltd. 10pts.wt. of a catalyst L-310 and 300pts.wt. of toluene is uniformly sprayed to the treated surface of said metal core at tank pressure of 1kg/cm<2> and air pressure of 4kg/cm<2> and the coated layer is heated at 150 deg.C for 1hr to form a silicone rubber layer with a thickness of 90mum.

Description

Detailed Description of the Invention: J-sensitivity f1 (detailed explanation of the invention) This article is about the manufacturing method of Rohnow.

As a method of manufacturing a heating roll for fixing, a method is known in which fluorine 1fi+silicone rubber is formed on the surface of a metal shaft containing a heating source.

The heating roller for fixing is characterized by its ability to withstand high toner aging (agIV), excellent peelability of transfer paper, and excellent durability.

In the case of fluororesin, powder such as tetrafluoroethylene-hexafluoropropylene copolymer or perfluoroal xyvinyl ether resin is charged, applied to a metal core by spraying, etc., and then heated and fused. Manufactured using electrostatic powder coating to achieve a coating thickness of about 100 ml.

In the case of silicone rubber, heat-vulcanized silicone rubber is extruded using an extruder or the like, coated on a metal core, cured by vulcanization, and polished to the required dimensions to produce a product.

Conventional fIJ manufacturing methods have high costs and complicated molding processes.

In addition, if the maximum roughness of the roll surface is not maintained at 5 microns or less, especially in the case of fluororesin Takarazen rolls, if the surface area is large, for example, the diameter is 30 mm, surface unevenness EIS (Yuzu scalloped) will appear on the black solid area. There are some drawbacks.

Kai, Tateko's invention is for the production of heating rolls for fixing in electronic copying machines; using the old method, the molding process can be simplified and the maximum surface roughness can be reduced to 5 microns or less without surface polishing, without affecting the black solid areas. It is aimed at something.

4 senses To achieve this purpose, a liquid curing type silicone rubber dissolved in a solvent was sprayed around the metal shaft.
This is a method for manufacturing a heating roll for fixing, in which a silicone rubber surface layer of 0.00 microns is formed and the maximum roughness of the surface is 5 microns or less.

A heating roll for fixing made using this manufacturing method can produce good copies with a black solid state that is hardly noticeable.

Examples are shown below, outer diameter 30 mm, length 4 () OI
After treating the surface of the metal core of IIIll with adhesive, it was rotated at 50 r, p, m with a rotating machine.

After that, low-drying old curved silicone rubber manufactured by Shin-Etsu Chemical Co., Ltd.
-4300100 Heavy crystal part and touch gX1-310 Heavy crystal part dl
・A mixture consisting of 300 parts of luene was heated to a pressure of 1 Kfl using a paint pressure tank manufactured by Iwata Painting Co., Ltd. and a pressure regulator.
After spraying uniformly at an air pressure of 4 kg/ci and heating at 150° C. for 1 hour, a 90 micron silicone rubber layer was formed.

As mentioned above, the fixing roll manufactured according to the present invention has the excellent characteristics that the manufacturing method is simple and the maximum surface roughness is 5 microns or less.

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Claims (1)

[Claims] A liquid curing type silicone rubber dissolved in a solvent is spray-coated on the four ends of the metal shaft to form a silicone rubber surface layer of 30 to 500 microns, and the maximum roughness of the surface is 5 microns or less. A method for manufacturing a heating roll for fusing in an electronic copying machine.