MONOAXIALLY STRETCHED SHAPED ARTICLE OF POLYTETRAFLUOROETHYLENE AND PROCESS FOR PRODUCING THE SAME

摘要

To produce a monoaxially stretched shaped article of polytetrafluoroethylene (PTFE), a pasty mass containing PTFE powder is continuously shaped to a shaped body, which is fed over a plurality of rollers or rolls, heated and stretched. The shaped body is heated to a temperature of between 327 DEG and 450 DEG C. prior to stretching strain, it is sintered simultaneously and is then stretched. This process allows for the production of a monoaxially stretched shaped article of PTFE which has strength values in the stretching direction of at least 500 N/mm2 and a delivery of between 1.80 and 2.30 g/cm3.