Process for thermomechanically treating a fleece web made of thermoplastic synthetic resin and an apparatus for carrying out the process

摘要

PCT No. PCT/DE96/01371 Sec. 371 Date Oct. 31, 1996 Sec. 102(e) Date Oct. 31, 1996 PCT Filed Jul. 20, 1996 PCT Pub. No. WO97/05312 PCT Pub. Date Feb. 13, 1997A process for the thermomechanical treatment of a fleece web which is comprised of filaments and/or fibers of a thermoplastic synthetic resin in a continuous process. The fleece web is moved during the thermal treatment continuously and with uniform speed. The fleece web passes initially a thermal treatment station and in this is traversed by a gas stream of predetermined gas flow velocity and gas flow temperature and is heated to a preheating temperature. The preheated fleece web is subjected to mechanical treatment. The gas flow temperature and the gas flow velocity on the one hand and the treatment stretch of the fleece web in the thermal treatment station on the other are so selected that the preheating temperature at all speeds which can be assumed by the fleece web, including zero speed, does not exceed the temperature of the melting point of the filaments and/or the fibers. Also apparatus for carrying out the process of the invention are given.