Process for the preparation of shaped articles
OwnerFriedrich Imgraminventor
Life of this patent
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Abstract
Shaped articles, particularly tubular shaped articles, are formed by a process comprising molding a crosslinkable synthetic plastic material into a first molded shape, crosslinking the plastic material at a temperature in excess of the crystalline melting point of the material, subjecting the crosslinked first shape to a working operation to form a second configuration shape and subjecting specific areas of the second shape to a heat treatment thereby forming a deformation in the specific area. Extruded tubular materials subjected to a stretching operation tend to seek their original shape upon heat treatment thereby making the degree of deformation possible nearly equal to the degree of stretching.
Claims13
A process for the preparation of shaped articles from crosslinkable synthetic plastic materials comprising:
- molding a crosslinkable synthetic plastic material into a first configuration;
- crosslinking said crosslinkable synthetic plastic material at a temperature in excess of the crystalline melting point of said material;
- working said crosslinked first configuration into a second configuration having a predetermined relationship to said first configuration;
- subjecting specific areas of said second configuration to a localized heat treatment to obtain a deformation in said specific areas of said second configuration without a return to said first configuration of said article, wherein the magnitude of deformation of the final configuration is between the magnitude of deformation of said first configuration and the magnitude of deformation of said second configuration.
Dependencies are inferred from the claim text.