EP0965673B1 - Method and device for intermittently applying dye to moving yarns - Google Patents

Description

The present invention relates to the field of the textile industry, in particular the treatment of the threads, in particular by dyeing the threads and has for subject a dyeing process by depositing stains of dye baths different colors on moving wires, in a succession of posts coating, by cyclic or pseudo-random interruption of said deposit in said coating stations.

The invention also relates to a device for setting work of this process.

Textile threads generally undergo, before their use, especially for weaving, washing and / or bleaching treatments as well as dye.

For this purpose, the dyeing is in particular carried out wet using machines at one or more coating stations, which are crossed by the threads of a layer of threads to be dyed.

In these known coating stations, in particular by FR-A-2 650 311 and FR-A-2 693 486, as well as by US-A-5 339 658 and US-A-5 594 968, the wires are successively impregnated with stains commonly called "space dyeing" by cyclic or pseudo-random interruption from the application of tincture.

Such an interruption can be achieved by action on the means for supplying the dye bath, namely by providing an applicator of the type turbine delivering radial jets or a wiper roller applicator cooperating with rotary means of cyclic or pseudo-random support of wires on said rollers, or even by providing an applicator of the type nozzle cooperating with a movable shutter, for example in the form of a disc provided with at least one calibrated dye passage slot. This last embodiment is known in particular from FR-A-2 719 058.

Machines fitted with these coating heads allow generally meet all quality requirements. However, their processing capacity is limited, i.e. a number of wires corresponding to width of the sheet formed at the maximum length of the shutter, in the case a nozzle-type applicator cooperating with a movable shaped shutter disc with at least one calibrated slot, i.e. at maximum speed thread scrolling, in the case of coating by contact with wiper rollers cooperating with rotary means for cyclic support of wires on said rollers, due to the inertia of the rotary actuators.

As a result, an increase in yield is not possible only by increasing the internal volume of the coating heads. Such a solution is not possible, however, for obvious reasons size of the coating heads which would cause a corresponding oversizing of the whole machine.

Indeed, stain dyeing processes and devices commonly called "space dyeing" do not allow the achievement of tasks relatively short in length only by acting on the speed of scrolling moving wires, compensating for the inertia of the means cyclic closure of the application of the dye bath or of the actuators rotary rotary means for cyclically supporting the wires on the rollers lickers.

The object of the present invention is to overcome these drawbacks by proposing a method and a device for dyeing by depositing stains of baths of dyes of different colors on moving yarn, in a succession of coating stations, by cyclic or pseudo-random interruption of said deposit in said coating stations, allowing either obtaining very short spots for a scrolling speed given, i.e. a significant increase in said scrolling speed for a preset stain length and thus a corresponding improvement performance.

To this end, the method is characterized in that, in each coating station, the threads are put out of contact with the dye bath by a linear or pseudo-linear actuating means acting on said dye bath.

The invention also relates to a device for setting work of this process, comprising a succession of coating stations, in each of which are successively applied stains of dyes by means of dye bath applicators and devices cyclic or pseudo-random interruption of the deposition of said baths, characterized in that said cyclic or pseudo-random interrupt devices of the dye bath depot have actuators linear or pseudo-linear acting on said dye baths.

la figure 1 est une vue schématique d'un poste d'enduction de teinture conforme à l'invention, en position de service ;

la figure 2 est une vue analogue à celle de la figure 1, en position d'interruption de service ;

les figures 3 et 4 sont des vues analogues à celles des figures 1 et 2 d'une variante de réalisation de l'invention, et

les figures 5 et 6 sont des vues analogues à celles des figures 1 et 2 d'une troisième variante de réalisation de l'invention

The invention will be better understood from the description below, which relates to preferred embodiments, given by way of nonlimiting examples, and explained with reference to the appended schematic drawings, in which:

Figure 1 is a schematic view of a dye coating station according to the invention, in the service position;

Figure 2 is a view similar to that of Figure 1, in the service interruption position;

FIGS. 3 and 4 are views similar to those of FIGS. 1 and 2 of an alternative embodiment of the invention, and

Figures 5 and 6 are views similar to those of Figures 1 and 2 of a third alternative embodiment of the invention

Figures 1 to 6 of the accompanying drawings show schematically a dye coating station by bath deposition on threads in motion, in particular for a space dyeing treatment, in which said deposit of dye bath on running threads is carried out, in a processing enclosure, not shown, via a dye bath applicator 1 cooperating with a device 2 cyclic or pseudo-random interruption of the deposition of said dye bath. In these embodiments, the dye bath applicator 1 is under shape of a nozzle, a turbine or a projection plate of a jet of dyeing.

To implement a dyeing process by depositing stains of dyes of different colors on threads movement, a succession of coating stations thus equipped is arranged on the course of threads running, so as to achieve in each posts a pseudo-random or cyclic application of colored spots different.

In accordance with the invention, in each coating station, the running yarns are put out of contact with the dye bath by a linear or pseudo-linear actuating means acting on said bath dyeing.

To this end, a device implementing this method, comprising a succession of coating stations, in each of which are successively applied stains of dye baths by means applicators 1 for dye baths and interrupters 2 cyclic or pseudo-random deposition of said baths, is characterized in that that said devices 2 for cyclic or pseudo-random interruption of the deposit dye baths include linear or pseudo-linear actuators acting on said dye baths.

As shown more particularly, Figures 1 and 2 of attached drawings, according to a first embodiment of the invention applying to coating stations provided with applicators 1 in the form of cooperating nozzles, turbines or spraying or spraying plates with a means 5 for guiding and limiting the width of the bath jet tincture, each device 2 for cyclic or pseudo-random interruption of the deposit of dye bath is advantageously constituted by a pallet 3 extending into the operating position, that is to say during the bath deposition dyeing, perpendicular to the dye bath jet, so parallel to the direction of travel of the wires, this pallet 3 being secured, either directly, either through a mechanical amplifier movement (not shown), with an output rod from a linear actuator or pseudo-linear 4 and deflecting said jet in a receiving tank 6 disposed on the opposite side with respect to said jet, above the means 5 for guiding and limitation of the width of the dye bath jet.

Thus, during the application of the dye bath, the palette 3 remains in the retracted position shown in Figure 1 of the accompanying drawings. An interruption of the dye jet is carried out, as shown in Figure 2, by setting the linear or pseudo-linear actuator 4 in motion, which results in a release of its rod and a displacement of the pallet 3 in the course of the dye bath jet, which is thus diverted into the tank reception 6, without being able to reach the scrolling wires. Prediction possible mechanical movement amplifier means to obtain a sufficiently large displacement of the pallet 3, while not using only short or very short stroke actuators, therefore small footprint.

Figures 3 and 4 of the accompanying drawings show a variant for carrying out the invention, also applicable to coating stations fitted with applicators 1 in the form of nozzles, turbines or plates of projection or spraying cooperating with a means 5 for guiding and limitation of the width of the dye bath jet, in which each device 2 for cyclic or pseudo-random interruption of the bath deposit dyeing consists of a rule 7 mounted on a deformable device, such as the free end of a bimetal arm 8, or the like, part of which is integral with the coating station infrastructure and the other part of which cooperates with the rod of a linear or pseudo-linear actuator 9 for deflect the dye bath jet, on the opposite side with respect to said jet, in a receiving tank 6 disposed above the means 5 for guiding and limitation of the width of said jet. This embodiment allows a arrangement of the actuator 9 in the vertical space requirement of the station coating, so that the overall length of the station can be reduced, which is particularly advantageous with a succession of stations, the total length of an application machine can be reduced Consequently.

In the case of an embodiment according to Figures 3 and 4, a actuator control 9 causes a push on the blade of arm 8 integral with the actuator rod and, due to the rigid holding of the other blade, this arm 8 undergoes a bending deformation resulting in a displacement of rule 7 in the course of the dye bath jet, which is then diverted to the receiving tray 6, so that the running wire is not more impregnated with dye. In this embodiment the device 2 is in the form of an actuator cooperating with a deformable device under form of a bimetallic strip. Of course, it is also possible to achieve this deformable device in another form, namely a linkage, a elastically deformable element by torsion, or other.

According to an alternative embodiment of the invention, not shown in the accompanying drawings, each device 2 for cyclic or pseudo-random interruption of the dye bath deposit can consist of a rule 7 mounted on a deformable device, such as a piezoelectric actuator with bending. Such an actuator, known under the name of "bender", is deforms under an electric charge by undergoing a bending causing the rule 7 in the course of the dyeing throw, deflecting it beyond the reach of thread running. A schematic representation of such an actuator would correspond substantially to that of the bimetallic strip of Figures 3 and 4 of the drawings attached. Thus, the power supply of the piezoelectric actuator to bending will cause a displacement of its rule 7 interruption of the jet in the latter, preventing dyeing of the wire in scroll for the duration of this feed. Of course, such actuator can also work in reverse, i.e. it can interrupt the dye stream when it is not being fed, while its feeding will allow said dyeing, by removing rule 7 out of the trajectory of the jet.

In accordance with another alternative embodiment of the invention, not shown in the accompanying drawings, the device 2 cyclic or pseudo-random interruption of the dye bath deposit can also be in the form of a flap extending parallel to the jet dye bath, the pivot axis of which is parallel to the jet and the plane threads running and which is provided with a cooperating actuation lever with the output rod of a linear or pseudo-linear actuator. In such case, the linear or pseudo-linear actuator can extend perpendicular to or parallel to the flap, depending on a positioning of the lever in the extension of said flap or perpendicular to it. The operation of such a device 2 is identical to that described in connection with the embodiment according to FIGS. 3 and 4, the bending movement being simply replaced by a pivoting movement.

Figures 5 and 6 show another alternative embodiment of the invention, in which the cyclic interrupt device 2 or pseudorandom of the dye bath deposition comprising a palette 3, a rule or flap connected to a linear or pseudo-linear actuator 4, cooperates with a means 5 for guiding and limiting the width of the bath jet mobile dyeing parallel to the threads in motion and in the opposite direction that of device 2, by another linear or pseudo-linear actuator 10. Thus, it is possible to simultaneously deflect the jet of dye bath via device 2 and displacement of the means 5 for guiding and limiting the width of the jet, so that the speed of interruption of the application of the dye bath jet can be increased.

It is also possible, according to another variant of realization of the invention not shown in the accompanying drawings, to realize the device 2 for cyclic or pseudo-random interruption of the bath deposit dyeing directly in the form of a means 5 for guiding and limiting the width of the dye bath jet consisting of two movable pallets, one towards each other to completely close the jet passage opening in the interrupted position, each pallet being controlled individually by a linear or pseudo-linear actuator.

According to another alternative embodiment of the invention, not shown in the accompanying drawings, the device 2 for cyclic interruption or pseudo-random deposition of the dye bath can also be constituted by at least one nozzle for projecting an air jet perpendicularly or in bias with respect to the dye bath jet or the layer of yarn in scrolling above the wiper rollers, opening and closing the or nozzles being controlled via one or more corresponding linear or pseudo-linear actuators. So each triggering of the air projection nozzle (s) will have the effect of diversion of the dye bath jet to a receiving tank for a reuse of the dye bath, by return to the feed tank, or a deflection of the wires out of contact with the wetting roller corresponding.

Air jet projection nozzles are known for various applications, in particular for directional blowing, and are not not described in detail. The nozzles used by the present invention are advantageously flat jet nozzles with a width corresponding to the dimension of the dye bath jet to be interrupted, perpendicular to the direction of travel of the wires, or to the width of the layer of wires to be removed the corresponding wiper roller.

Preferably, the linear or pseudo-linear actuators 4, 9 and 10 are linear electric motors, piezoelectric actuators or electromagnetic actuators, fitted or not of a mechanical movement amplifier, controlled in all or nothing or in proportional mode via an electronic device corresponding.

All electronic control devices for individual actuators 4, 9 and 10 of the different coating stations is managed by a central computer means according to a program defining the alteration of the repeatability of the successive spots of color deposited in coating stations. Such a means of IT management is known in itself and does not require a detailed description. The aforementioned actuators have ultra-fast reaction capacities, namely of the order of a few fractions of milliseconds, so that the lengths of the spots can be significantly reduced.

Thanks to the invention, it is possible to carry out a method and a dyeing device by depositing stains from baths of color dyes different on moving wires of the space dyeing type, in a succession of coating stations, by cyclic or pseudo-random interruption of said deposit in said coating stations, this interruption taking place in each station independently.

In addition, due to the use of control means linear or pseudo-linear with extremely short reaction time, the interruption of the application of dye bath can be carried out very quickly and the color spots on the wires may be faint length compared to those obtained by the methods known to date.

Finally, the use of linear or pseudo-linear actuators, whose operation is very reliable and not very subject to wear allows to limit the frequency of maintenance of the means of interrupting the coating resulting in corresponding operating efficiency gains.

Of course, the invention is not limited to the modes of embodiment described and shown in the accompanying drawings. Modifications remain possible, especially from the point of view of the constitution of the various elements or by substitution of technical equivalents, without going out of the protection field of the invention.

Claims (12)

1. Method of dyeing by depositing spots of dye baths of different colours on moving yarns in a succession of coating stations, by cyclic or abrupt pseudo-random interruption of said deposition in said coating stations, characterised in that, in each coating station, the travelling yarns are abruptly placed out of contact with the dye bath by a linear or pseudo-linear actuating means acting on said dye bath.
2. Device for carrying out the process according to claim 1, comprising a succession of coating stations in each of which spots of dye baths are successively applied by means of dye bath applicators (1) and devices (2) for cyclic or pseudo-random interruption of the deposition of said baths, characterised in that said devices (2) for cyclic or pseudo-random interruption of the deposition of the dye baths comprise linear or pseudo-linear actuators acting on said dye baths.
3. Device according to claim 2, characterised in that, in the case of coating stations equipped with applicators (1) in the form of nozzles, turbines or spray or atomisation plates cooperating with a means (5) for guiding and limiting the width of the jet of dye bath, each device (2) for cyclic or pseudo-random interruption of the deposition of dye bath consists of a blade (3) extending, in the service position, in other words during deposition of dye bath, perpendicularly to the jet of dye bath, therefore parallel to the direction of travel of the yarns, this blade (3) being attached to an output rod of a linear or pseudo-linear actuator (4) and diverting said jet into a receiving tank (6) disposed on the opposite side relative to said jet, above the means (5) for guiding and limiting the width of the jet of dye bath.
4. Device according to claim 2, characterised in that, in the case of coating stations equipped with applicators (1) in the form of nozzles, turbines or spray or atomisation plates cooperating with a means (5) for guiding and limiting the width of the jet of dye bath, each device (2) for cyclic interruption of the deposition of dye bath consists of a straight edge (7) fitted on a deformable device such as the free end of a bimetallic arm (8) or the like of which one part is attached to the infrastructure of the coating station and of which the other part cooperates with the rod of a linear of pseudo-linear actuator (9) so as to divert the jet of dye bath from the opposite side relative to said jet into a receiving tank (6) disposed above the means (5) for guiding and limiting the width of said jet.
5. Device according to claim 2, characterised in that, in the case of coating stations equipped with applicators (1) in the form of nozzles, turbines or spray or atomisation plates cooperating with a means (5) for guiding and limiting the width of the jet of dye bath, each device (2) for cyclic or pseudo-random interruption of the deposition of dye bath consists of a straight edge (7) fitted on a deformable device such as a bending piezoelectric actuator.
6. Device according to claim 2, characterised in that, in the case of coating stations equipped with applicators (1) in the form of nozzles, turbines or spray or atomisation plates cooperating with a means (5) for guiding and limiting the width of the jet of dye bath, each device (2) for cyclic or pseudo-random interruption of the deposition of dye bath has the form of a flap extending parallel to the jet of dye bath, of which the pivot axis is parallel to the jet and to the plane of the travelling yams and which is equipped with an actuating lever cooperating with the output rod of a linear or pseudo-linear actuator.
7. Device according to claim 6, characterised in that the linear or pseudo-linear actuator extends perpendicularly to the flap or parallel thereto, depending on a positioning of the lever in the extension of said flap or perpendicularly thereto.
8. Device according to any one of claims 3 to 6, characterised in that the device (2) for cyclic or pseudo-random interruption of deposition of dye bath comprising a blade (3), a straight edge or a flap connected to a linear or pseudo-linear actuator (4) cooperates with a means (5) for guiding and limiting the width of the jet of dye bath which is movable in parallel with the travelling yarns and is moved, in the direction counter to that of the device (2), by a further linear or pseudo-linear actuator (10).
9. Device according to claim 2, characterised in that, in the case of coating stations equipped with applicators (1) in the form of nozzles, turbines or spray or atomisation plates cooperating with a means (5) for guiding and limiting the width of the jet of dye bath, the device (2) for cyclic or pseudo-random interruption of the deposition of dye bath has the form of a means (5) for guiding and limiting the width of the jet of dye bath consisting of two blades moving toward one another so as to completely close the opening for passage of the jet in the interruption position, each blade being controlled individually by a linear or pseudo-linear actuator.
10. Device according to claim 2, characterised in that the device 2 for cyclic or pseudo-random interruption of the deposition of the dye bath consists of at least one nozzle for spraying a jet of air perpendicularly or at a bias to the jet of dye bath or to the sheet of travelling yarns, the opening and closure of the nozzle(s) being controlled by one or more corresponding linear or pseudo-linear actuators.
11. Device according to any one of claims 2 to 9, characterised in that the linear or pseudo-linear actuators (4, 9 and 10) are linear electric motors, piezoelectric actuators or else electromagnetic actuators equipped or not equipped with a mechanical movement-amplifying means controlled in all-or-nothing mode or proportional mode by a corresponding electronic device.
12. Device according to any one of claims 2 to 9 and 11, characterised in that all the electronic devices for controlling the individual actuators (4, 9 and 10) of the various coating stations are managed by a central computer in accordance with a programme which defines the alteration of the repetition of the successive spots of colours deposited in the coating stations.

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