TXA 205 Lecture Notes - Lecture 4: Felt, Washing Machine, Spider Silk

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Very complex physical structure: scales, many layers, hydroscopic (absorbs moisture) Para-cortex: inside of crimp, does not absorb as well. Felting: agitation and friction+ pressure, heat, and moisture= felt (do not put wool in washing machine. From an animal 7 months old or younger. A. w hainsworth and sons ltd"s natural legacy: using wool for coffins (biodegrades easily since it is organic fibers) Adding weight to the silk with metallic salts. People do this to make greater profit off production. Spider silk: stronger than silk, lighter than iron. Flax is the fiber, cloth made from this is linen. Long irregular fibers from stem of the plant. Commercial production of viscose was marketed as artifical silk. Regular rayon- serrated cross sections and striations in longitudinal view. Hwm rayon- rounder cross section and better performance. Could not be dyed at first- new dyes had to be developed. Pollution faded- change of color when exposed to air pollutants.

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