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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