On the Wear Pesistance in Continuous Filament-Twines-II

Wear Process Analysis (1)

Abstract

This report describes the results of tests on twine-abrasion and the analysis on the process of twine wear with vinyliden twines. Based on the results of analysis of microphotographs, histograms and values of the tensile strength of the filaments of each sample twine, the following conclusions were made:
1) During the first stage of abrasion, the filaments of a twine develop small hangnails on the surface, resulting in the reduction in diameter of the filaments as the abrasion goes on. During the second stage of abrasion, the abraded filaments snap when the breaking strength of each filament becomes less than the frictional force. And then, the inner filaments of the twine in contact with the abrasive (oil stone) were abraded till they are broken. During the final stage of abrasion, some of the broken filaments get entangled with each other and the tensile strength of an individual filament in the twine ∑t/n which is more in the initial stage appears to be smaller as compared with the tensile strength T_N/n per one filament of the abraded twine in the other abrading stage, and get entangled during the process of abrasion.
2) Further, it has been observed that when the filaments of a twine are broken during the process of abrasion, some of the entangled filaments are separated by the frictional force and the twine consisting of the remaining intact filaments continues to undergo abrasion and breaks when the breaking strength of the twine becomes less than the frictional force between the twine and the abrasive.