Claims
- 1. A method of manufacturing a cylindrical supporting member, comprising,
- preparing a material of 10.sup.4 ohm.cm or lower in volume resistivity by blending a cross-linking polyphenylenesulfide resin as a main component, an amount of said cross-linking polyphenylenesulfide resin being at least 40 wt % to provide dimensional accuracy; a highly conductive carbon black of 10.sup.-1 ohm.cm or less in volume resistivity, an amount of said carbon black being less than 20 wt % and an average particle diameter of said carbon black being 20 to 50 nm; and a carbon black dispersant in an amount of 10-30 wt %. said carbon black dispersant being selected from a group consisting of calcium carbonate and clay, and
- injecting the material into a metal mold for a cylindrical supporting member.
- 2. A method of manufacturing a cylindrical supporting member of claim 1, wherein the metal mold for injection-molding is heated within a range of 120.degree. to 150.degree. C., and the material is heated within a range of 280.degree. and 330.degree. C.
- 3. A method of manufacturing a cylindrical supporting member of claim 1, wherein a filling time of the molding material is in 0.5 to 2.5 second.
- 4. A method of manufacturing a cylindrical supporting member of claim 1, wherein the metal mold includes a core mold finished to have a surface roughness of 1 micro meter or less at a maximum height and a draft angle of 0.15 to 0.25 degree on one side thereof; a cavity mold having an inner surface electro-formed with a nickel alloy and finished to have a surface roughness of 1 micro meter or less at a maximum height, and a step section at an inside of an end face, a material being filled into a cavity of the molds through the step section by using a side gate method; and a fixed mold having at least three spring knocks at an end face opposite to a circumference of the end face of the cavity mold so that when the mold is opened, an injection-molded product remains in the cavity mold by the spring knock.
- 5. A method of manufacturing a cylindrical supporting member of claim 1, further comprising irradiating ultraviolet rays of 180 to 255 nm in wavelength on an outer surface of the cylindrical supporting member.
- 6. A method of manufacturing a cylindrical supporting member of claim 1, further comprising inducing corona discharge treatment on an outer surface of the cylindrical supporting member.
- 7. A method of manufacturing a cylindrical supporting member of claim 1, further comprising glass fibers in an amount of 10-30 wt % relative to the cylindrical supporting member, each glass fiber having a diameter about 20 .mu.m and a length of 3 mm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-233974 |
Sep 1993 |
JPX |
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CROSS-REFERENCE TO RELATED APPLICATION
This is a divisional application of patent application Ser. No. 08/305,907 filed on Sep. 14, 1994, now U.S. Pat. No. 5,512,399.
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Klaus Stoeckhert, Mold-Making Handbook, pp. 148-152, 1983. |
Divisions (1)
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Number |
Date |
Country |
Parent |
305907 |
Sep 1994 |
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