Patent ID: 7858004

Claim:
A process for the production of high tenacity, highly oriented polyolefin sheet having a high heat of fusion comprising: a) providing a pair of horizontally aligned counter rotating calender rolls separated by a nip, a doctor blade in alignment with a first of said calender rolls, and a gap between said doctor blade and said first calender roll; b) feeding a metered amount of polyolefin powder into said nip between said counter rotating heated calender rolls; c) controlling the amount of polyolefin powder at said nip by adjusting said gap between said doctor blade and said first calender roll; d) rolling the powder through the nip until a coherent fully dense sheet of polyolefin is produced: and e) drawing the coherent fully dense sheet of polyolefin under controlled tension at a temperature of between 140° C. and 158° C. to produce a high tenacity, highly oriented polyolefin sheet having a high heat of fusion.