Waste water filter material, comprises successive different individual materials each formed from twisted thermoplastic threads, combined to optimize overall filtration and degradation performance

摘要

A filter material (10) comprises successive individual materials (101, 102, 103), each with multiple, predetermined shaped parts (11) formed from extruded thermoplastic fibers or threads irregularly twisted together to form hollow cavities for the flow of waste water. The successive individual materials (in the flow direction) contain threads of decreasing diameter and cavities of decreasing size.