Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Intermittent length
Reexamination Certificate
1999-06-04
2001-07-31
Coe, Philip R. (Department: 1746)
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Intermittent length
C068S20500R
Reexamination Certificate
active
06266835
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the field of textile industry, in particular the treatment of filaments, particularly by dyeing filaments and has for its object a process for dyeing by depositing spots of dyebath of different colors on moving filaments, in a series of application stations, by cyclic or semi-random interruption of said deposition in said application stations.
The invention also has for its object a device for practicing this process.
BACKGROUND OF THE INVENTION
The textile filaments are generally subjected, before their use, particularly for weaving, to washing and/or bleaching treatments as well as dyeing.
To this end, the dyeing is particularly carried out in moist condition by means of machines with one or several application stations, which are traversed by the filaments of a layer of filaments to be died.
In known application stations, particularly from FR-A-2 650 311 and FR-A-2 693 486, as well as U.S. Pat. Nos. 5,339,658 and 5,594,968, the filaments are subjected to successive impregnations by spots, commonly called “spaced dyeing” by cyclic or semi-random interruption of the application of the dyestuff.
Such an interruption can be carried out by acting on the means for supplying the dyebath, namely by provision of an applicator of the turbine type delivering radial jets or an application with contact rollers co-acting with rotatable means for cyclic or semi-random application of the filaments to said rollers, or else by a provision of an applicator of the nozzle type co-acting with the movable closure member, for example in the form of a disc provided with at least one calibrated slot for passage of the dyestuff. This latter embodiment is particularly known from FR-A-2 719 058.
Machines provided with application heads generally satisfy all the requirements of quality. However, their treatment capacity is limited, either to a number of filaments corresponding in width to a layer formed at the maximum length of the closure member, in the case of an applicator of the nozzle type co-acting with a movable closure member in the form of a disc provided with at least one calibrated slot, or to a maximum speed of movement of the filaments, in the case of application by contact with contact rollers co-acting with rotatable means for cyclic application of the filaments against said rollers, because of the inertia of the rotatable actuators.
As a result, an increase in output is not possible except by increasing the internal volume of the application heads. Such a solution is however not suitable, for obvious reasons of the size of the application heads involving the corresponding over-dimensioning of the assembly of the machine.
Thus, the processes and devices for dyeing by application of spots, commonly called “spaced dyeing”, do not permit the provision of spots of relatively short length except by changing the speed of movement of the filaments, compensating the inertia of the cyclic closure means for application of the dyestuff, or the rotatable actuators of the rotatable means for cyclic application of the filaments against the contact rollers.
SUMMARY OF THE INVENTION
The present invention has for its object to overcome these drawbacks by providing a process and device for dyeing by deposition of spots of dyebath of different colors on moving filaments, in a series of application stations, by cyclic or pseudo-random interruption of said deposition in said application stations, permitting either obtaining spots of very short length for a given speed of movement, or a substantial increase of said speed of movement for a preestablished length of spot, and thus a corresponding improvement of output.
To this end, the process is characterized in that, in each application station, the filaments are placed out of contact with the dyebath by a linear or pseudo-linear actuating means acting on said dyebath or on said moving filaments.
The invention also has for its object a device for practicing this process, comprising a series of application stations, in each of which are successively applied spots of dyebath by means of dyebath applicators and devices for the cyclic or pseudo-random interruption of the deposition of said baths, characterized in that said cyclic or pseudo-random interruption devices of the deposition of the dyebath comprise linear or pseudo-linear actuators acting on said dyebaths or on said moving filaments.
REFERENCES:
patent: 3570275 (1971-03-01), Weber et al.
patent: 4015550 (1977-04-01), Bartenfeld et al.
patent: 4033153 (1977-07-01), Ahrweiler et al.
patent: 4047271 (1977-09-01), Paterson et al.
patent: 4254644 (1981-03-01), Bartlett et al.
patent: 4783977 (1988-11-01), Gilpatrick
patent: 2178339 (1973-11-01), None
patent: 2 240 312 (1975-03-01), None
patent: 2333883 (1977-07-01), None
patent: 2 719 058 (1995-10-01), None
patent: 2 059 876 (1981-04-01), None
Henry Pierre
Massotte Philippe
Saura Francois
Coe Philip R.
Superba S.A.
Young & Thompson
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