Abstract
The increased need for higher production of dyed yarns, particularly those made of texturised polyester fibres, has led to many modifications in both dyeing procedures and machine construction. The machinery modifications and the reasons for them are discussed. Largely, they have been made to reduce the time required for one cycle of the total volume of dye‐liquor. However, to reap the full benefits of such modifications, several other mechanical changes are necessary. The possible effects of these changes on the economics of dyeing, as well as the procedural changes which may be necessary or advantageous, are considered. In particular, a modified procedure using a newly developed auxiliary is described. The need for more and greater accuracy of automation is stressed. The machines currently available are described briefly.
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