Recent developments in dyeing for the carpet trade are reviewed under two headings, viz. (a) dyeing by batchwise or substantive methods and (b) continuous dyeing. Reference is made to new techniques for the batchwise dyeing of wool—nylon and wool—Evlan*—nylon unions, as well as to a new type of nylon-reserving agent for use when dyeing these blends. Piece dyeing of carpet containing polyamide fibres with differential-dyeing affinity to give solid, tone-in-tone, and contrast effects is also reviewed, and mention is made of a technique that can be used on all-wool carpets to produce similar results.
The continuous dyeing of different fibres in the form of loose stock, card sliver, slubbing, tow; and carpet is reviewed, and methods for space-dyeing synthetic-polymer yarns are outlined.