Premium
Effect of Processing and Finishing on Wool. I‐Water‐sorption Properties
Author(s) -
LEEDER J. D.,
WATT I. C.
Publication year - 1967
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1967.tb02765.x
Subject(s) - wool , dyeing , humidity , reagent , chemistry , sorption , saturation (graph theory) , relative humidity , water content , absorption of water , pulp and paper industry , adsorption , materials science , composite material , organic chemistry , physics , mathematics , geotechnical engineering , combinatorics , engineering , thermodynamics
Equilibrium water contents of wool samples taken from many stages of processing and wet finishing have been measured at various humidities. The absorption isotherms obtained have been related to the known effects that specific chemical modifications have on the wool—water isotherm. Mechanical processing of loose wool to fabric had a negligible effect on water uptake over the whole humidity range. In general, treatments that damage wool caused increased water uptake at high humidities, and two or more such treatments in succession resulted in higher water content than did single treatments. The presence of hygroscopic salts or reaction by‐products also increased water uptake above 80% r.h. The presence of dye generally reduced the water content at low and intermediate humidities. Under mild dyeing conditions the reduction of water content persisted up to saturation, but more severe treatment caused increased saturation water contents. Some setting treatments also reduced the water content at humidities below 80% r.h., presumably owing to the presence of added reagent, and dyeing followed by setting increased the reduction in water uptake. Surface degradation by chemical shrink‐res treatments increased water uptake at high humidities. None of the treatments studied caused large changes in regain in the humidity ranges encountered in normal use.