Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Special forms and forming
Patent
1989-08-07
1991-12-17
Coe, Philip R.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Special forms and forming
8158, 8400, 68 13R, 68 20, 68207, D06B 506, D06B 1509, D06B 2300
Patent
active
050724720
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a continuous process for dyeing textile thread, particularly thread of synthetic fibers, by impregnation of this thread by means of a dye solution constituted of at least one base colorant dissolved in an appropriate solvent, process in which the thread is passed continuously through an impregnation enclosure containing said solution, then through at least one enclosure for water extraction by compressed air in which one collects a liquid residue from water extraction.
The present invention relates likewise to an installation for the implementation of the process, comprising at least one impregnation enclosure followed by at least one water extraction enclosure, means to pass a textile thread continuously through said enclosures, and a circuit of dye solution passing into the impregnation enclosure and provided with recovery means under this enclosure and under the water extraction enclosure.
2. Discussion of Background and Relevant Information
One of technique for continuously dyeing textile threads is described in the French patent application published under the number 2,429,288 and include passing the threads into at least one dye bath contained in at least one tank fed with dye solution. These tanks usually contain a relatively significant volume of dye solution, to avoid a too rapid decrease in the dye bath. The "correction" of the bath is carried out generally periodically, by manual addition of base colorants, possibly followed by a colorimetric control.
These tanks are constantly fed with new dye solution to compensate for the used portion, and in practice operate at a constant level.
In the technologies using dye baths in which one soaks the threads on reels or skeins, the bath ratio is currently from 1 to 10, i.e. that for 100 Kg of treated products, the bath must Contain approximately 1000 Kg of dye solution. Given that the base colorant is expensive, this technique which is not economical, also poses the ecological problem of evacuation of the remaining solution.
All of the prior techniques have numerous disadvantages that both include economical and technical considerations.
SUMMARY OF THE INVENTION
The present invention proposes to remedy the disadvantages cited above, of the conventional dying procedures and apparatus by making available an economical and precise process for dyeing textile threads, as well as an installation for the implementation of this process.
To this end, the process according to the invention is characterized in that, during the water extraction of the thread, the liquid residue from water extraction in the dye solution is reused, an automatic colorimetric analysis of this solution is performed and if necessary, a correction of color of this solution by addition of appropriate quantities of the base colorant and/or of the solvent is automatically achieved. These quantities are determined automatically with respect to the results of the colorimetric analysis, and the corrected solution is used for the impregnation of the thread in the impregnation enclosure.
If the dye solution is composed of several base colorants dissolved in an appropriate solvent, an automatic colorimetric analysis of the dye solution is performed with a view to determining the content of the solution in each of the base colorants and to automatically achieve, if necessary, a correction of color of the dye solution by adding quantities of the base colorants. Moreover, if necessary, a correction of color of the dye solution is automatically achieved by adding quantities of the base colorants, determined by one unit of calculation with respect to the results of the colorimetric analysis for each of the base colorants contained in the solution.
Preferably, an initial phase of starting the process is performed, in which a colorimetric analysis of gradation of the dye solution is performed, and the results of this analysis in the unit of calculation in the form of reference values is memorized, and subsequently in
REFERENCES:
patent: 3241343 (1966-03-01), Yazawa
patent: 3905327 (1975-09-01), Daniel
patent: 4374322 (1983-02-01), Hoffmann et al.
patent: 4901254 (1990-02-01), Dolezalek et al.
Coe Philip R.
Passap Knitting Machines Inc.
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