Patent ID: 8734700
Filing Date: 2014-05-27
Classification: B29C,B29K,D01D,D01F

Abstract:
1. A process for the production of high tenacity, highly oriented polyolefin sheet having a high heat of fusion comprising: a) feeding a metered amount of a ultra high molecular weight polyethylene (UHMWPE) powder to an apparatus comprising: b) rolling the polymer powder through the nip under these conditions until a coherent polyolefin sheet is produced; c) once a coherent polyolefin sheet exits the nip, adjusting the temperature in the nip to a temperature between 12 degrees C. lower to 8 degrees C. greater than the temperature required to initiate the onset of melting for the particular polyolefin powder being processed as determined by differential scanning calorimetry; and d) drawing the coherent polyolefin sheet under controlled tension at a temperature of between 140 and 158° C. to produce a high tenacity, highly oriented polyolefin sheet having a high heat of fusion.