B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/00 (2006.01) B29C 47/00 (2006.01) B29C 47/34 (2006.01) B29C 47/86 (2006.01) B29C 47/94 (2006.01) B29C 55/06 (2006.01)
Patent
CA 2098503
2098503 9211125 PCTABS00014 A process for producing a high modulus article includes forcing a high molecular weight plastic material, such as plyethylene, through a passage (30) of which the cross-sectional area diminishes in the forward direction of plastic flow, thus producing an extrudate (42). The plastic material is extruded while it is close to or at its melt temperature, and it is lubricated to obtain substancially plug flow through the passage. The speed at which the plastic material flows through the passage is adjusted so that the elongational velocity gradient at any longitudinal position within the passage does not exceed about 2.6 sec.-1, thus minimizing the degree of molecular orientation in the extrudate. The extrudate can be deformed by drawing while it is maintained at or close to its melt temperature, thus producing an oriented, deformed extrudate. The same is then quickly cooled to preserve the orientation. A suitable plastic material is high molecular weight polyethylene with an average molecular weight lying between about 500,000 and about 1,500,000.
Tate Kenneth R.
Woodhams Raymond T.
Sim & Mcburney
Tate Kenneth R.
Woodhams Raymond T.
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