Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – By a temperature change
Patent
1976-11-16
1978-09-19
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
By a temperature change
156137, 156140, 264326, B29H 501, B29H 722
Patent
active
041155106
ABSTRACT:
An elastomeric composition is shaped into a conveyor belt and cured in three steps. In the first step the uncured composition is heated to the curing temperature of the elastomer and pressed at a pressure which is at least equal to the vapor pressure of volatile constituents in the composition to avoid bubbles but less than 6 kg/cm.sup.2 until the composition becomes plastic. At this point, the pressure is increased to about 6 to 10 kg/cm.sup.2 to shape the composition into the configuration of a conveyor belt while maintaining the temperature of the composition at the curing temperature of the elastomer. In a third step, the pressure is reduced to a pressure of not less than the vapor pressure of volatile constituents of the composition and less than 6 kg/cm.sup.2 while maintaining the temperature of the composition at the curing temperature of the elastomer until the elastomer is cured.
REFERENCES:
patent: 3607561 (1971-09-01), Hutz
patent: 3619332 (1971-11-01), Bongers
patent: 3779845 (1973-12-01), Hutz
patent: 3860684 (1975-01-01), Vance
Hoag Willard E.
Industrie Pirelli S.p.A.
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