Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1986-03-06
1988-05-31
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264325, 26433117, 264337, 623 19, 623 20, 623 22, B29C 4316, B29C 4352
Patent
active
047479906
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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Gaussens Gilbert
Haudin Jean M.
Monasse Bernard
Association pour la Recherche et le Developpement des Methodes e
CIE Oris Industrie S.A.
Tentoni Leo B.
Thurlow Jeffery
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