| 摘要 |
<p>A process for producing a non-sintered polytetrafluoroethylene (PTFE) winding, comprises mixing a PTFE powder with a lubricant, pressing the material into a cylindrical blank, pressing to form a section with reduced external dimensions and then rolling to form a band. A round string (6) is formed from the blank which is rolled to form the band (10). A process for producing a non-sintered polytetrafluoroethylene (PTFE) winding, comprises mixing a PTFE powder with a lubricant, pressing the material into a cylindrical blank, pressing to form a section with reduced external dimensions and then rolling to form a band. A round string (6) is formed from the blank which is rolled to form the band (10). Residual PTFE and lubricant material is greater in the pressurized central region than over the edges. The string is oval in shape. The width of the band is at least 6 times, especially 8-14 times the diameter of the string. The band has a thickness of 20-200, especially 40-160 micrometers. The thickness reduces by 5 micrometers at the edges.</p> |
