Jig-type textile finishing method

Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Combined liquid and gas or vapor

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Details

8151, 68 5C, 68 15, 68180, D06B 332

Patent

active

057583765

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to finishing a textile by passing a given material through a treatment bath, said material being rolled up after passing through the bath, and said passage being performed alternately in one direction and in the opposite direction by successive rolling-in and -out of the material. More particularly, the present invention relates to an improved finishing method of this type and also to apparatus for implementing said method, and in particular apparatus known as jig apparatus.
All kinds of treatment can be applied to pieces of cloth in a jig, including bleaching, dyeing, and stripping, i.e. soaping cloth after it has been dyed with a reactive dye.
A jig operates by rolling out a piece of rolled-up cloth constituting a first roll, in causing it to pass through a heated treatment bath, and then in rolling it up again so as to form a second roll. Once the first roll has been fully rolled out, the travel direction is reversed so that the first roll is built up again at the expense of the second, with the cloth continuing to pass through the treatment bath. The jig has various control members for reversing the direction of rotation of the rolls, for stopping operation after a number of passes that is determined in advance, for regulating the speed of the rolls, and for regulating the tension of the cloth.
Compared with other apparatuses for finishing pieces of cloth, jigs are apparatuses having a short bath ratio, i.e. the weight of treated material relative to the volume of the impregnation bath is small, lying in the range 1 to 2. Its main advantage therefore lies mainly in savings of water and of energy.
Nevertheless, for dyeing purposes, the use of a jig is limited because of problems associated with non-uniform treatment, which can show up as variations in color, particularly at the leading and trailing ends of the pieces of cloth treated, or else in a central strip appearing in the piece. From one pass to another, such non-uniformity can also give rise to poor reproducibility of the effect obtained on the cloth, and this may apply to dyeing or to feel.


PRIOR ART

Proposals have already been made in document EP-A-0 063 203 to apply microwaves and saturated or superheated steam simultaneously in the treatment of a sheet of textile material inside a confined chamber within which said sheet is rolled up by passing alternately in one direction and then in the other, being rolled in and out in succession. According to that prior document, applying microwaves simultaneously with saturated or superheated steam has an effect of causing treatment to be uniform over the entire length and thickness of the textile material, thereby mitigating to some extent the above-specified drawbacks.
Nevertheless, in jig type industrial apparatuses, no provision is made for feeding saturated or superheated steam. As a result, the teaching of document EP-A-0 063 203 requires additional means to be implemented and that is hardly practical on equipment already in existence, and it may give rise to condensation phenomena.
According to the Applicants, the use of a jig is not optimum with respect to treatment kinetics: according to their observations, this would appear to be due to a drop in temperature suffered by the cloth between leaving the treatment bath and being rolled up, which drop in temperature is caused by the cloth passing from the bath at a given temperature through air that is at a lower temperature.


SUBJECT MATTER AND SUMMARY OF THE INVENTION

The object of the Applicants is to provide an improved method that achieves better treatment kinetics in a textile finishing apparatus of the jig type.
This object is fully achieved by the method of the invention. In manner known from document EP-A-0 063 203, the method is a textile finishing method in which the textile material passes through a heated treatment bath and is rolled alternately in one direction and in the other while electromagnetic waves are applied to said textile material as it is being rolled in and/or out.


REFERENCES:
"Dye Fixation Using Radio-frequency Heating" Perkin & Catlow, JSDC vol. 100, pp. 274-280, Sep. 1984.

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