Process of making a high molecular weight polyolefin part
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United States of America Patent
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May 31, 1988
Grant Date -
N/A
app pub date -
Mar 6, 1986
filing date -
Mar 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a high molecular weight polyolefin part, particularly for an articular prosthesis and to its production process by shaping in a closed mould. This part, which has a friction surface, has a structure such that the polyolefin chains are oriented parallel to the friction surface, at least in the zone of the part located below or flush with said friction surface. This orientation is obtained during the shaping of the blank of the part in a closed mould having a metal belt, a hemispherical block and a mobile punch, as a result of the choice of shaping conditions, particularly the shaping temperature and the length/transverse dimension ratio of the blank.
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