THERMAL-FORMING PROCESSES

A process for manufacturing a shaped thermoplastic product having reduced internal shrinkage stress by thermally forming a thermoplastic material and cooling the shaped material rapidly until the surface has cooled to an upper critical temperature T0 and then reducing the temperature gradient within...

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Bibliographic Details
Main Authors WILLIAMS, JAMES GORDON, PORTINGELL, GRAHAM CALLEND, CANN, JOHN MICHAEL
Format Patent
LanguageEnglish
Published 30.10.1985
Edition4
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:A process for manufacturing a shaped thermoplastic product having reduced internal shrinkage stress by thermally forming a thermoplastic material and cooling the shaped material rapidly until the surface has cooled to an upper critical temperature T0 and then reducing the temperature gradient within the product until the termoplastic has cooled to a lower critical temperature T1. The critical temperatures are determined by the VICAT method for penetrations of 0.1 mm (T0) and 1 mm (T1).
Bibliography:Application Number: EP19820303110