The effects of time, temperature, and humidity on wrinkle formation and recovery have been studied during the five distinct phases considered to control wrinkling behavior. Quantitative test data are readily influenced by the history of the fabric, by preconditioning, and by conditioning; the environmental conditions prevailing during all phases must be carefully controlled. Conversely, application of the empirical data now available allows considerable latitude in the choice of conditions of temperature, humidity, and time. Conclusions from earlier work indicating that it is advisable to change the temperature and/or humidity immediately before wrinkle insertion are reinforced by the present results.

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Electrical-discharge treatment of wool fabric at atmospheric pressure increases its wettability and dye absorption. An investigation is described in which the best results were obtained with a glow discharge produced by using a small air gap between the electrodes, low fabric regain, and low relative humidity. With increase in the size of the air gap, regain, and r.h., the discharge was characterized by streamers or sparks or both, and the improvements in wettability and dye absorption were not as good.

Careful control of steam-pressing techniques results in improved wrinkle recovery.