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A New System of Continuous Flash Dyeing
Author(s) -
DUCKWORTH C.,
RIDYARD A. J.,
WRENNALL L. M.
Publication year - 1978
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1978.tb03407.x
Subject(s) - dyeing , process engineering , recipe , flash (photography) , pulp and paper industry , yield (engineering) , computer science , environmental science , materials science , chemistry , engineering , composite material , art , visual arts , food science
This paper describes work carried out during the development of a new ‘Flash’ continuous‐dyeing system for cellulose‐based fabrics. The new system was aimed primarily at the successful application of vat dyes, which worldwide still account for very substantial yardages and form a high proportion of fabric which is continuously dyed. Earlier investigations had shown that novel methods held promise, but perhaps not sufficient to displace current techniques. The conventional pigment pad‐hot flue‐chemical pad‐steam sequence has long been preferred for high quality vat dyeing, but changes in recent years have made it clear that alternative systems could find favour. These changes include:1 Much shorter runs per colour. 1 Blends with other fibres, especially with polyester. 1 Higher operating costs (labour, water, energy, dyes, etc.) which call for a reduction in downtime due to colour changes, and the need for more accurate recipe formulations without recourse to instrumental prediction techniques.These changes in trading conditions, along with the high capital cost of the preferred conventional equipment, have made economic processing more difficult. The new process is a simple pad system with an ‘all‐in’ dye bath. Deep dyeings of normal fastness can be readily obtained. Recipe formulations for production can be predetermined in the laboratory. The time for a complete change of colour varies from I minute for pale‐medium dyeings to 5 minutes for deep dyeings. Dye yield is excellent. Space requirements are halved and energy (motive power and steam) demand is cut by two‐thirds.