| 摘要 |
Textile fibres or made-up goods of vegetable origin are heated while dampened with an aqueous solution of a peroxygen compound to a temperature of at least 275 DEG F. under conditions such that they do not dry out to any substantial extent. The goods may have been previously treated with an aqueous solution of a wetting agent which may contain sodium pyrophosphate, sodium hexametaphosphate, sodium tripolyphosphate or sodium tetraphosphate, or may have been heated under similar conditions while dampened with a strongly alkaline aqueous solution. The "dampened" goods contain from 50 to 150 per cent, based on the dry weight of the goods, of the treating liquid. Heating temperatures up to 400 DEG F. are specified and the heating medium may be saturated steam under pressure. An initial alkali treatment may be with sodium hydroxide, soda ash, borax, sodium silicate, trisodium phosphate or mixtures thereof. The peroxygen compound may be hydrogen peroxide, an alkali metal percarbonate, perborate or phosphate perhydrate, peracetic acid or performic acid or their salts, and the aqueous solution thereof, at a pH of 10 to 11.5, may contain one of the previously mentioned alkalis and/or a wetting agent, examples of which include various sulphonated organic compounds, ethylene oxide condensates, alkylolamine condensates and soap. The materials treated include grey goods and goods which have been scoured, soured, desized or boiled, and may be of cotton or linen. Goods in long length may be treated in a continuous process. |
