Polymer filter for melting process

In the production of spunbonded nonwovens, in order to ensure the smooth progress of the spinning process and reduce the occurrence of broken filaments and dripping, two sets of filtering devices are generally installed. The first filter (rough filter) is installed between the screw extruder and the metering pump, and its main function is to filter out larger impurities, so as to extend the use time of the second filter device and protect the metering pump and spinning pump. , To increase the back pressure of the extruder, thereby contributing to the exhaust and plasticization of the material during compression. The second filter (fine filter) is installed in the spinning assembly, and its main function is to filter fine impurities, crystal points, etc., to prevent clogging of the spinneret, to ensure the smooth progress of spinning, and to improve the quality of the fiber. The shape of the filter screen depends on the shape and size of the spinneret, and is generally a multilayer rectangular filter.