30—studies of Blending on the Worsted System: Part I

Yarns of black and white fibres have been blended, drawn and spun on the worsted system by seven different processing schemes, and examined for irregularity of appearance and blend by several methods. Cox's predictions as to the minimum required number of doublings have been supported; fine yarns are better mixed than coarse; 20/80 blends are more difficult to mix than 50/50. The test methods based on the number or ratio of black and white fibres in a series of sections do not appear very senstitive. Cluster tests involving examination of the aggregation of fibres in the cross-section seem more promising.