AN IMPROVED PROCESS FOR DETECTING A BROKEN FILAMENT AND A DEVICE FOR THE SAME

摘要

A process and a device for detecting a broken filament in a multiplicity of filaments are provided, wherein the process comprises: extruding the molten polymer through spinning capillaries into filamentary streams; quenching the filamentary streams with cooling air to harden the streams into filaments; applying finish to the filaments; sensing and recording the presence of a broken filament by passing the filaments past a flexible cantilever beam that is spaced from the filaments at a predetermined distance from the filaments, and wherein a piezoelectric film sensor is secured to the beam, and wherein the film sensor is part of an electric circuit containing also means for recording electric impulses from the film sensor, whereby impact from a filament defect on the beam will cause the beam to flex and stretch the film sensor, and will initiate an electric impulse from the film sensor in the electric circuit, and wherein the electric impulse is recorded to detect the broken filament.