Heat on Wool Versus Fulling

Abstract

Details are given of a method for evaluating the fullability of wool yarn. This was used on wool yarn samples which had been subjected to either "wet" or "dry" heat for times and temperatures which ranged from "mild" to "severe" conditions. Exposed and unexposed samples were tested for (1) urea bisulfite solubility, (2) alkali solubility, (3) swelling, (4) moisture regain, (5) strength, (6) elongation vs load, and (7) full ability. The urea bisulfite solubility test was most sensitive for judging wool damage by heat; others showed significant differences, but at higher levels of exposure. Still others were found to, be unsuited for indicating mild or moderate impairment of fulling. Normal levels of urea bisulfite solubility have been assigned for "ideal" wool, mill processed wool, and wools which have been exposed to heat long enough to affect fulling.

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References

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