The reasons for the generally poor build-up properties of monochlorotriazinyl reactive dyes when applied to silk by recommended procedures have been investigated. The most important factor is the hydrolysis of dye-fibre bonds during dyeing. This cannot be avoided, but fixation can be improved by the use of tertiary-base catalysts to increase the rate of dye-jibre bond information.
A programme of work designed to assess the suitability of modern methods of colouring carpets (continuous dyeing, carpet printing, yarn printing) for wool revealed few problems for the fibre, but ring‐dyed fibres could result from any of the processes. The performance defect associated with ring dyeing was abrasion frosting in use. It seemed that ring dyeing could be due to excessive oil residues, incorrect selection of dyes or chemicals, or too short a steaming time. A systematic investigation was indicated, but existing techniques for measuring ring dyeing were too tedious to provide adequate data.
An existing test for assessing abrasion frosting in furnishing fabrics has been modified for use with carpets. In addition, a rapid electronics method for measuring dye penetration into fibre cross‐sections has been developed. Some preliminary results are presented.
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