Abstract
The effects of size on yarn properties, briaking strength, elongation at the break, stiffness and cohesion of the filaments to one another, have been studied in some detail and reported in the literature, but little has been published concerning the distribution of the size on the yarn. Considerable has been said about sizing for "penetration" or for "coating" without definite knowledge as to which result was being achieved. An examination of yarn, or cross-sections of the yarn, under the microscope tells nothing about the size distribution unless the material has been treated so that the size is differentiated from the yarn. This article deals with a method for differentiating the size on viscose yarn and presents the details of a technique for embedding, sectioning, and photographing sized and unsized viscose rayon. Results obtained by application of this method will be presented in subsequent articles.
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