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US 5,683,639 AGranted
Shortened sintering cycle for molded polytetrafluoroethylene articles
AssigneeE. I. Du Pont de Nemours and Company
InventorsSina Ebnesajjad, Thomas Joseph Manista
Life of this patent
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Abstract
Sintering oven utilization is increased by completing the sintering cycle for a molded article of granular polytetrafluoroethylene outside of the oven inside an insulation shell.
Claims6
A process for sintering an article molded under pressure from granular polytetrafluoroethylene, comprising
- (a) heating said article in an oven to a temperature above the melting point of said polytetrafluoroethylene to sinter said article,
- (b) cooling said oven to a temperature no higher than 320.degree. C.,
- (c) removing said article from said oven when said temperature is no more than 320.degree. C., and
- (d) completing the cooling of said article outside of said oven and without chilling said article so as to avoid deformation of said article during said completion of cooling.
1 more element
Dependencies are inferred from the claim text.