Relation of Warp Sizing to Loom Efficiency

Abstract

In a test covering a period of eight weeks the average loom efficiency of a group of looms was 90.4%. A careful analysis of the data collected during this test showed that the largest single cause of warp breaks was balling-up in back of the reed, which accounted for 23.1% of the warp stops or 10.1% of the total loom stops. If to this are added the number of other breaks occurring at the reed, i.e., those not due to balling-up, and the number of breaks due to frayed yarn, we have all the stops which can be con sidered as being caused by size failure. The results of this test showed that 37.59% of the warp stops, or 16.39% of the total loom stops, could be attributed in this way to size failure.

Moreover, supplementary tests showed that the time required to repair a warp break was approximately 2.19 times as long as that required for a filling break. So the failure of the warp size is an appreciable factor in the loss of loom efficiency even when the sizing is considered satisfactory by the weave room.

Next to size failure, knots were the most important source of warp stops. They accounted for 14.75% of the total loom stops.

Filling stops formed a large percentage: 56.37% of the total loom stops. Although this is an important cause of loss in weav ing efficiency it is not as large as it might first appear to be, because of the fact that the average filling break takes less than one-half of the time required for repairing a warp break.