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US 5,686,505 AGranted
Process and apparatus for surface treatment of unvulcanized rubber sheet
AssigneeBridgestone Corporation
InventorsYukihiro Kusano, Mahito Fuji, Masato Yoshikawa, Kazuo Naito, Fumihiro Matsuyama, Yoshio Nohara, Setsuo Akiyama
Life of this patent
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Abstract
Only an outer surface of an unvulcanized rubber sheet is preliminarily crosslinked by irradiating an infrared ray or a far infrared ray to the unvulcanized rubber sheet prior to subsequent final vulcanization, whereby the occurrence of rubber spew and rubber flash is considerably suppressed at the vulcanization step.
Claims5
A process for treating a surface of an unvulcanized rubber sheet, comprising the steps of:
- irradiating by an infrared ray or a far infrared ray an outer surface of the unvulcanized rubber sheet to preliminarily crosslink only the outer surface of the sheet prior to vulcanization and subsequently vulcanizing the rubber sheet, wherein control of an occurrence of rubber flash or spew after vulcanization is obtained.
Dependencies are inferred from the claim text.