Stress Development in Glass Fiber Textile Forming Packages

Abstract

An elementary model has been developed for predicting the stresses generated within a glass strand textile forming package taking into account the package profile and variable internal support caused by the gradual retraction of the movable segments of a rotating expandable collet as the package is being formed.

The results of an analysis of the extreme conditions typifying a marginal production operation have been used to relate observed package quality and processability characteristics to predicted mechanical behavior. It is shown that a given system's operating characteristics can be displayed on an operating diagram in terms of dimensionless collet finger collapse and maximum package size parameters. It is also suggested that the resulting package quality and processability can be predicted from the promixity of its operating characteristics to a critical region in the diagram. This critical region represents conditions under which winding continues to take place after the interior portions of the package have been subjected to axial compression, probably resulting in trapped ends and inter-fiber abrasion.

Other representative winding conditions have been examined in light of this model and have shown quantitative and qualitative agreement.