Variations in Roving Weight Introduced by the Slubber

Abstract

Conventional sizing tests of slubber roving involve the cutting and weighing of 12-yd. lengths from the outside layers of bobbins. In the present study, mill produced rovings were subjected to special sizing tests, whereby each bobbin was sized to the barrel. The results showed many unusual patterns of variation, which are described here. One fre quent finding was that roving was excessively light or stretched at frame start-up.

A comparison of processing methods, test results, and correlation diagrams of the data is presented, from which general conclusions may be drawn concerning the processing of roving. Since the weight variation in the sliver fed was determined, the weight varia tion introduced by the slubber could be evaluated.