| 摘要 |
<p>In dyeing keratinous fibres, such as wool, by impregnating the fibres with aqueous compositions containing dyes, followed by storage in the moist condition, a higher level of fixation, enabling heavier shades to be obtained with cheaper dyes, can be achieved by raising thetemperature of the stored fibres by means of radio frequency heating. The storage temperature is preferably between40 and 80°C, which usually requires about 0.05 kw hour/kg fibres. Acid, milling, chrome and premetallised dyes can be used, as well as reactive dyes and substantive optical brighteners. Thefibres are cuttled into an insulated plastics material cart (18) located between a pair of electrodes in a radio-frequency chamber. One electrode (14) is fixed and the other (16) is adjustable so thatthe r.f. load acting on the fibres may be set at a desired value.</p> |
