MECHANICAL EFFECTS OF LUBRICANT AUXILIARY AGENTS IN SIZE FILM REINFORCEMENT OF WARP YARNS .1. SURFACE EFFECTS OF FATTY LUBRICANTS ON FILM FORMATION IN RINGSPUN YARN SUBSTRATES

Warp yam sizing materials were selected to improve yarn abrasion resis tance during weaving. The current standard industrial practice for siz ing yarn is to add a lubricant such as a wax, oil or other fatty subst ance in the size bath. Two size formulae, each with two different lubr icant types or no lubricant present, were prepared and sizes were appl ied to a single yarn set in an industrial location to compare warp yar n performances. The effects of using wax, oil or no lubricant in the m ix were compared in laboratory analysis and in weaving tests on a prod uction model weaving machine. Using factorial experimental design, sto p frequencies were compared for those categories related to warp sizes . Scanning electron microscopy allowed examination of lubricant effect on size film formation. The abrasion resistance of sized warp yarns w as compared to abrasion-related weaving stops for each formula with ea ch lubricant treatment present. Undesirable effects on abrasion resist ance were determined where lubricants were present.