Bleaching and dyeing; fluid treatment and chemical modification – Diffusion transfer dyeing process – transfer sheet and product
Patent
1990-04-30
1993-03-23
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Diffusion transfer dyeing process, transfer sheet and product
8543, 8552, 8558, 8561, 8562, 8917, 8918, D06P 500, B41F 1602, B41M 126
Patent
active
051960303
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a process for transfer printing a moist textile web, which wholly or predominantly consists of natural fibres and/or synthetic fibres, preferably on the basis of cellulose. A minor part of the material may be synthetic fibres. By transfer pattern printing is understood continuous transfer of a pre-printed pattern from a pattern carrier web to the textile web, the two webs being caused to contact each other continuously in a transfer region which is frequently in the form of one or more pairs of pressure rollers. The invention also concerns an apparatus and a pattern carrier web for use in the process.
Transfer pattern printing is a technique which has been known for a long time, and which has been widely used commercially since the late fifties in particular in the form of sublimation transfer printing for use in printing on textile webs of synthetic fibres, and it involves e.g. the advantage over direct textile printing that the converters can rapidly switch the production to other patterns, so that the supplies of various designs in stock can be limited to the actual demand, while as regards direct textile printing the manufacturer will in practice often have to produce quite large supplies of the individual designs to keep the expenses per printed textile length at a reasonable level.
Another advantage of transfer pattern printing is that it is possible to obtain a quite sharp and finely detailed transfer of the patterns, which have been preprinted by means of suitable dye and with the desired fineness and sharpness on a suitable pattern carrier web.
Transfer pattern printing has been extensively used for these reasons, and the technique is abundantly described in various embodiments in the patent literature. Processes for transfer pattern printing on textile webs of synthetic fibres and/or natural fibres by wet transfer of the pattern from a pattern carrier web to the textile web by brining the webs together, e.g. by passage through rollers, are thus known from the Danish Patent Application (5666/68, which, however, uses a pattern carrier of paper, the fibres of which have the same cellulose structure as cotton, or of silicone treated paper with which the dye has poor or no affinity. The transfer, which takes place at a very small pressure, requires considerable heating of the order of 80.degree. to 300.degree. C. and a typical contact time of between 90 seconds and 5 minutes. In order to reduce the contact time it is necessary to incorporate an organic solvent or white spirit in the dye. However, even with reduced contact time it is a discontinuous process. The same is the case with the Danish Patent Application 1566/69, which requires a contact time of 20 to 220 seconds and a temperature of at least 100.degree. C., typically up to 180.degree. C. The dye is mixed into a water-based paste optionally containing an organic solvent. If the process described is carried out continuously the print becomes unclear and the results consequently unacceptable. A similar process is known from the SE Patent Specification 137 674, which, however, requires using as pattern carrier web a paper web coated with e.g. wheat starch, formaldehyde and a melamine resin applied in separate steps. Statably, the dye has no affinity with this coating. Further, solvent-based inks are used having a high content of white spirit, and the transfer process takes place using high pressure and heating. The aggregate process comprises many components which today would be inconceivable for use in connection with transfer printing, if only for environmental reasons.
Altogether, the known continuous processes for transfer pattern printing are generally performed using elevated temperatures and/or solvent-based inks, and in most cases special demands are made in respect of the nature of the pattern carrier web. Thus, the GB Patent Specification 1 430 831 describes a process which is carried out in a transfer chamber under high-pressure conditions at temperatures above 100.degree. C., thus creating a saturated st
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Akerblom Inga S.
Pedersen Jorgen
Rasmussen Knud V.
Thoren Claes-Goran
Billerud AB
Clingman A. Lionel
Dansk Transfertryk A/S
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