Method and apparatus for the production of high tenacity...

Details Method and apparatus for the production of high tenacity... Method and apparatus for the production of high tenacity...

2008-04-01

2010-12-21

Theisen, Mary Lynn F (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With reshaping or surface embossing of formed article

C264S120000, C264S288400

Reexamination Certificate

active

07854870

ABSTRACT:
A process for the production of virtually full density polyolefin suitable for further processing by drawing to form a high tenacity, highly oriented polyolefin sheet comprising: a) feeding a metered amount of polyolefin powder into the nip between two heated calendar rolls initially set at a gap smaller than the size of the smallest polyolefin powder particle and at a temperature above the melting point of the powder; b) rolling the powder through the nip under these conditions until a coherent sheet of polyolefin is produced: and c) once a coherent sheet of polyolefin exits the nip lowering the temperature in the nip to a temperature below the melting point of the polyolefin powder and increasing the gap to a desired level above the thickness of the largest powder particle. Apparatus for the performance of such a process is also described.

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