Book Synopsis One-step Dyeing and Durable Press Finishing of Cotton by :
Download or read book One-step Dyeing and Durable Press Finishing of Cotton written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cotton is one of the most commonly used fibers for textiles, as many garments are made from dyed and durable press (DP) finished cotton. Conventionally, cotton is dyed first, then finished with a crosslinking agent to obtain the desired color and DP properties. If the two steps could be merged, significant savings in energy, chemicals, water, labor, and machine occupation time would be achieved. Since the 1950s, many researchers have attempted to combine dyeing and DP finishing processes into one step. However, a commercially viable one step dyeing and DP finishing process has not been reported. The main challenge has been producing treated fabrics that have deep shades, good washfastness, and excellent DP performance simultaneously. In the present research, two new one step dyeing and DP finishing processes were developed. One of the methods was a one step steam-cure process that included padding, drying, steaming, curing, and washing. The second involved a one step batch-dry-cure process composed of padding, batching, drying, curing, and washing. These methods afforded deep fabric shades (K/S> 15) and dye fixation levels> 95%. Washfastness was as good as that from a conventional reactive dyeing method and fabric DP properties were comparable to those from a separate DP finishing process. It was shown that reactive, direct, and even acid dyes could be used for dyeing cotton in these one-step processes. The mechanism of dye fixation on fabrics dyed using these processes was studied. By 1) varying dyes, DP agent levels, and application conditions, 2) characterizing the chemistry that occurs between dyes and DP agents on glass plates under standard finishing conditions, and 3) conducting extractions of fabrics and their powdered forms following one-step dyed and DP finished, the basis for dye fixation was established. The results of these experiments showed that the key to effective one step dyeing and DP finishing is complete dye diffusion before curing occurs. Aft.
