Method for molding ultra-high molecular weight polyethylene mold

Details Method for molding ultra-high molecular weight polyethylene mold Method for molding ultra-high molecular weight polyethylene mold

1974-06-27

1976-08-17

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

B27J 500

Patent

active

039754812

ABSTRACT:
A method for molding powder of ultra-high molecular weight, linear polyethylene comprising particles of less than 100 micron mean particle size having narrow particle size distribution is free-sinterable to form solid articles by a process comprising (a) molding a solid preform by compressing the polyethylene molding powder at a temperature below its crystalline melting point under pressure of at least 2,000 p.s.i., (b) releasing the pressure and (c) free-sintering the preform at temperature above its crystalline melting point.

REFERENCES:
patent: 2736925 (1956-03-01), Heisler et al.
patent: 3051993 (1962-09-01), Goldman et al.
patent: 3134830 (1964-05-01), Roelen

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