Plastic well filter pipe

摘要

Plastic well filter pipes have a slitting, which runs either parallel or at an angle to the filter axis (pipe axis). It is rectilinear and longer - usually also wider - on the outside then on the inside, because it is made by a circular-saw cut. In contrast to this conventional form, the invention envisages slits which run in a zig-zag or wave form (Fig. 2-h) and are longer (Fig. 2-m/n) and wider (Fig. 2-k/l) on the inside then on the outside, which is made possible by production in injection moulds. <IMAGE>