Abstract
The application of electron microscopy to the study of cellulose acetate fibers has been demonstrated by the use of high-resolution Al-Be replicas. Abraded surfaces and the skin of fibers have been studied.
Various materials used for guides abrade the fiber surfaces in different manners. Ceramic guides cause a sticking action, whereas metallic guides produce a shearing of the cellulose acetate surfaces.
The skin consists of a highly oriented layer which is caused by drafting the fiber while solvent is still within the core. It is nonuniform and less extensible than the core. Other factors remaining constant, higher draft causes formation of a thicker skin, which is made up of layers. Yarns broken in tension show very jagged cracks and hairlike protuberances. Pigment dispersions and structural details are revealed by etching the fibers.
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