Process for the continuous production of high-strength and high-

Details Process for the continuous production of high-strength and high- Process for the continuous production of high-strength and high-

1990-07-25

1992-04-21

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Stratified or layered articles

264113, 264119, 264120, 264122, 264126, B29C 4324, B29C 4330

Patent

active

051065550

ABSTRACT:
A process is provided for the continuous production of a high-strength and high-modulus polyethylene material having excellent properties. According to the process, powder composed of ultra-high-molecular-weight polyethylene powder as a principal component is subjected to compression molding, rolling and stretching. The polyethylene powder has an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin. The compression molding is carried out by feeding the polyethylene powder between endless belts arranged in an opposing up-and-down relation, and conveying the polyethylene powder while holding the same between the endless belts and at the same time, continuously compression molding the polyethylene powder at a temperature lower than its melting point by a compressing means provided inside of the endless belts. In at least one of the compression molding step and rolling step, an olefin polymer having a molecular weight lower than the polyolefin polymer is concurrently processed.

REFERENCES:
patent: 4487875 (1984-12-01), Nakajima et al.
patent: 4764326 (1988-08-01), Hakim
patent: 4820466 (1989-04-01), Zachariades
patent: 4879076 (1989-11-01), Sano et al.
patent: 4925880 (1990-05-01), Stein
patent: 5004778 (1991-04-01), Waagen et al.

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