JPS61273566A - Manufacture of cleaning blade - Google Patents

Abstract

PURPOSE:To easily separate a sheet type cleaning blade material from the surface of a cylindrical mold without using any releasing agent and to maintain the adhesive strength to a holder sufficiently by baking liquid fluororubber, etc., on a rotating cylinder mold and forming the pattern surface, and injecting urethane rubber into the mold surface. CONSTITUTION:A coating layer 8 is formed on the internal surface of the cylindrical mold 7 of a centrifugal molding device and then while the cylindrical mold 7 is rotated at a specific rotating speed, liquid fluororubber or liquid fluorosilicone is baked and cured to form the mold surface of 20-300mum in thickness. Thus, the cylindrical coating layer 8 is formed and easily separated from the cylindrical mold 7, and it is cut to a specific size to maintain the adhesive strength between a cleaning blade and the holder sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a method of manufacturing a cleaning blade for an electrophotographic copying machine.

Cleaning the photoreceptor is an important issue in electronic copying machines, especially so-called RPC copying machines used for plain paper.One of the tear cleaning methods is to apply an elastic rubber blade such as urethane rubber or neoprene rubber to the electrophotographic photoreceptor. A so-called cleaning blade method has been put into practical use in which residual toner on the photoreceptor is removed and cleaned by contacting the photoreceptor.

Additionally, since this method brings the blade into physical contact with the surface of the moving photoreceptor, the surface roughness accuracy (edge accuracy) of the end surface of the blade that comes into contact with the photoreceptor becomes a serious problem. is defined as 10 microns or less, and if it is 10 microns or more, copying defects such as ghost images or thread lines will occur on the recording paper.

Conventionally, to achieve this edge precision, liquid rubber is injected into a rotating cylindrical mold, centrifugally molded until the fluidity disappears, the mold is removed, and the resulting cylindrical molded body is cut into a flat plate and cured. After that, the material was cut into required dimensions using a razor or the like to produce a sheet-like cleaning blade material.

It is a common practice to apply a mold release agent to the surface of the cylindrical mold to prevent the rubber material from adhering to the cylindrical mold during demolding.

However, the sheet-like cleaning blade material manufactured by this method has an edge precision of 10 microns or less on the naturally hardened surface, the so-called mirror surface side, and can fully satisfy the cleaning performance.

However, since the mold surface remains adhered to the mold release agent, the adhesive strength between the rubber blade material and the holder will deteriorate unless the mold surface is washed with a solvent to remove the mold release agent, especially when fixing to the holder with adhesive. It had the drawback of not being able to withstand long-term use.

This application solves the problem caused by the mold release agent during demolding, and the sheet-like cleaning blade material can be easily demolded from the cylindrical surface without using a mold release agent, and the adhesive strength with the holder is improved. It is a manufacturing method that can maintain the
While rotating the inner surface of the cylindrical shape, liquid fluororubber or liquid 70-mouth silicone rubber is baked and hardened to a thickness of 20 to 300μ.
A coating layer with a thickness of m is formed, liquid rubber such as urethane rubber is injected into the mold surface coating layer, centrifugal molding is performed until the fluidity disappears, and the resulting cylindrical molded body is cut, flattened, and cured. This method of manufacturing a cleaning blade is characterized in that after completing the above steps, the cleaning blade is cut into required dimensions.

Examples will be described below.

After coating the inner surface of the cylindrical mold 8 of the centrifugal molding device as shown in the figure with a polysiloxane-based brimer, the cylindrical mold 8 was
While rotating ~2000 r, p, +, liquid fluorosilicone rubber, SE 1570 from Toshi Silicone Co., Ltd.
After spray coating fj to form a coating layer of 100 μm thick, it was baked at 150° C. for 30 minutes.

The structure of the centrifugal molding device is that a heating jacket 4 whose outer periphery is covered with isi and has a passage 2 for heating fluid inside, and whose opening is closed with a lid 3, is formed by penetrating through the bottom of the heating jacket 4. , one end of the rotating shaft and one end of the rotary shaft 6 provided to be rotated by the rotary shaft 6 was fixed to one end of the rotating shaft 6, and one end of the cylindrical shape 8 having the coating layer 1 was fixed in an atmosphere of 90°C. Inner diameter soommm, length 2501III11
The cylindrical inner surface has a hardness of 70' on the JISA scale and a thickness of 10.
It is a coating layer of 0 μm 70-hole silicone rubber, and the hardness is JIS while rotating the cylindrical internal wave WI layer at i ooo rotation.
Liquid urethane 9 blended to give an A scale of 10'
After injection, the mold was rotated, and when the fluidity disappeared, the rotation was stopped and the mold was left for 1 hour, and then removed from the mold.

At this time, the mold could be easily removed without adhesion to the 70-hole silicone rubber coating layer.

This cylindrical molded body was cut in the axial direction, opened flat, and placed on a surface plate and treated at 110° C. for 10 hours to complete curing.

At this time, the thickness of the sheet was 1.5a+m, and the obtained sheet was attached to a cutting machine and cut into a sheet blade material having a width of 20u and a length of 400a+m.

This sheet blade material was fixed to an aluminum boulder using double-sided adhesive tape.

This adhesive strength is 1.5 kg/cm in terms of 90° peeling strength, and can withstand use for a sufficient length wj.

[Brief explanation of the drawing]

The figure is a sectional view of an example of a centrifugal molding apparatus used in the manufacturing method of the present invention. 1...Heat insulation layer 2...Heating channel passage 3...
・・・Lid 4・・・・・・Heating jacket 5・・・・・・Motor 6・・・Rotating shaft 7・・・・・・Cylinder Type 8......Coating layer

Claims (1)

[Claims] While rotating the cylindrical mold, liquid fluororubber or liquid fluorosilicone rubber is baked and hardened to form a mold surface with a thickness of 20 to 300 μm. Liquid urethane rubber is injected into the mold surface and centrifuged until it loses fluidity. A method for manufacturing a cleaning blade, which comprises molding, cutting the obtained cylindrical molded body to complete curing, and then cutting it into required dimensions.