GB2134820A

GB2134820A - Application of liquor to warp threads

Info

Publication number: GB2134820A
Application number: GB08403673A
Authority: GB
Inventors: Gerhard Voswinckel
Original assignee: Sucker & Franz Mueller GmbH
Current assignee: Sucker & Franz Mueller GmbH
Priority date: 1983-02-19
Filing date: 1984-02-13
Publication date: 1984-08-22
Also published as: IT8447710A0; GB2134820B; JPS59203668A; IT1199064B; GB8403673D0; DE3305825A1

Abstract

Liquid or foamed concentrated viscous liquor is applied to warp threads 1 from a transverse nozzle 9 of a tank 10 to which liquor is supplied at a rate proportional to the speed of the threads. The driving motor 24 of a dosing pump 11 can be controlled, for example, by a control device 23 having an operative connection 22 with a rotating roller 3 embraced by the threads. <IMAGE>

Description

SPECIFICATION Process and apparatus for the application of a liquor to a substrate The invention relates to a process and apparatus for the application of a liquid or foamed concentrated highly viscous liquor to a substrate, particularly warp threads. Dye, size or similar agents have hitherto been applied to substrates, particularly to warp threads, by means of a liquor of low concentration and viscosity. The reason is that a concentrated viscous liquor could only be applied to or introduced into the substrate with difficulty. It is difficult to ensure an even application of concentrated highly viscous liquor by known means, so that less highly concentrated and less viscous liquors had to be adopted. This, however, results in the drawback that the substrate acquires a greater quantity of water or solvent, which then has to be expelled.

The purpose of the invention is first and foremost to enable drying energy and possibly also the consumption of solvent to be saved by reducing the proportion of water or solvent and at the same time to increase the efficiency of apparatus connected up for the subsequent drying process and to obtain more satisfactory over-all results in the application of the liquor.

The invention enables this object to be achieved as a result of the fact that the liquor, subject to excess pressure, is conveyed direct to the substrate, in proportion to the speed of the substrate, and is pressed into the substrate without other counter-pressure means, the pressure of the liquor being reduced in the substrate, the foam possibly being destroyed, and the liquor being pressed through the substrate as far as the side facing away from that on which it is applied, the liquor being prepared in the form of a liquid or as a foam.

The main advantages provided by the invention reside in the fact that drying energy is saved and a more satisfactory result obtained in the application of the liquor.

As no counter-pressure means is present at the place of application, the concentrated highly viscous liquor in the form of liquid or foam is able to penetrate the substrate unimpeded, the sole resistance to the said penetration being that offered by the substrate itself. If the liquor used consists of a foam the latter is already destroyed while passing through the substrate, so that the escaping air conveys particles of liquor in a liquid state to the opposte side of the substrate.

In a further version of the invention the substrate, following the application, is conveyed by internally cooled rollers rotating in the opposite direction to the movement of the substrate. The internal cooling of the rollers causes, the formation, on the surface of the rollers, of a light film of condensate which prevents contamination of the rollers and contributes to the smoothing of the substrate. The rotation of the rollers in opposite directions to each other also has the effect of rendering the concentration of the liquor uniform over the entire cross section of the substrate.

In a further version of the invention the substrate, after the application, is conveyed, by its side opposite to that on which the application is effected, over an internally heated drying cylinder.

This may, for example, be the first drying cylinder of a cylinder dryer. As a result, the drying process now commencing is accompanied by a residual migration of the liquor in the substrate, towards the roller side. This helps to render the concentration still more uniform, thus improving the result of the application.

For the performance of the new process an apparatus is proposed in which an outlet nozzle gap of a liquor tank is provided transversally to the direction of movement of the substrate, and resting against one side of the substrate, the concentrated highly viscous liquid or foamed contents of the said tank being kept under pressure by a dosing pump controlled in proportion to the speed of the substrate.

The pressure and proportions are maintained in accordance with the speed at which the substrate moves. The pressure of the liquor tank can be regulated in addition.

In a further embodiment of the invention an internally cooled roller, embraced over part of its periphery by the substrate is provided behind the point of application as viewed in the direction of movement of the substrate.

It is of advantage for the application apparatus of the aforementioned rollers to be followed by a roller dryer of which the first drying roller is embraced over part of its periphery by the moving substrate, by the side facing away from that on which the application is effected. This contact is decisive for the residual migration of the liquor in the direction of that side of the substrate which is opposite to the application side.

As the liquor is transferred direct to the substrate, the outlet nozzle itself must form the sealing surface to prevent unacceptable pressure loss at the application point. In a further version of the invention, therefore, the outlet nozzle gap rests by its edge against the substrate firmly enough to cause the substrate to change its direction. The width of the outlet nozzle gap can preferably be adjustable, which in its turn takes effect on the maintenance of the pressure and on the quantity of liquor applied.

Examples for the performance of the invention are illustrated in the drawings. The invention will be explained and described in greater detail in the following paragraphs and by reference to the said examples.

The drawings provide schematic diagrams of a first, second and third example of the invention in Figs. 1, 2 and 3 respectively. Fig. 4 shows a variant of the version illustrated in Fig. 3. In the first example, as shown in Fig. 1 , the substrate 1, in the form of a group of warp threads, moves from a beam 2 in the direction shown by the arrows via a motor-driven transport roller 3 and past an application station 4 and over a drum dryer 5 to a beam 6. The guide rollers 7 and 8 ensure that the substrate will embrace the drum roller 3 over part of its periphery.

At the application station 4 the outlet nozzle gap 9 of a liquor tank 10 is positioned transversely to the direction of motion of the substrate 1 and resting against a certain point on the said substrate 1 where no couter-pressure means is present. The concentrated highly viscous contents of the liquor tank 10 are thus kept under pressure by a dosing pump 11 controlled in proportion to the speed of the movement of the said substrate 1. For this purpose a pipe 1 3, 14, leads from a storage tank 1 2 via the dosing pump 11 to the liquor tank 10. The width of the outlet nozzle gap 9 can be regulated by means of an adjustable slide 1 5.

The drum dryer 5 consists of an internally heated drying cylinder 1 6 as the input cylinder and of further internally heated drying drums 17, 18, 1 9. After it has passed round part of the periphery of the drums the substrate 1 goes via guide rollers 20 and 21 to the motor driven beam 6.

Between the drying cylinder 1 6 and a control device 23 for the driving motor 24 of the dosing pump 11 is an operative connection 22. The control device 23 controls the driving motor 24 in accordance with the angle of rotation measured for the driving cylinder 16.

Behind the application point, as viewed in the direction of the motion of the substrate 1, an internally cooled roller 26 is provided which rotates in the opposite direction, as shown by the arrow 25, to that followed by the substrate, and which is embraced over part of its periphery by the said substrate 1. The internal cooling is effected by flowing water. Behind the roller 26, as viewed in the direction of motion of the substrate 1, is a similar roller 27 which likewise rotates in the opposite direction to that of the substrate. The roller 27 contacts a substrate 1 from the application side, while the roller 26 contacts it from the opposite side.

The drawing in Fig. 1 shows that the first drying cylinder and the first drying drum 1 6 of the drum dryer 5 is embraced over part of its periphery by that side of the moving substrate 1 which faces away from the application side. The moving substrate 1 is kept under tension as a result of the fact, among other means, that the beam 6 has a slightly higher peripheral speed than the transport roller 3. The outlet nozzle gap 9 rests by its edge 28 against the substrate 1 , which is subject to tractive force, firmly enough to ensure that the said substrate is thus caused to change its direction, as may be seen from Fig. 1.

After the liquor has been pressed into the substrate 1 there is first of all an after-treatment by the rollers 26 and 27, following which, on the drying drum 16, during the preliminary drying, a residual migration of the liquor takes place in the direction of the said drying drum. The final drying then takes place, followed by the operation of winding the substrate 1 onto the beam 6.

The example of the invention shown in Fig. 2 only differs from that shown in Fig. 1 by the fact that the group of threads, after leaving the roller 27, is sub-divided by split rods 29, 30, and 31, after which the threads are re-combined by a guide roller 32 before the substrate 1 reaches the drying drum 1 6.

The sub-division and re-combination of the group of threads offers a number of advantages.

Individual threads or ends close to the threads which are stuck together or tangled are reseparated, the migration of the liquor is improved, the subsequent drying process is rendered more efficient and the substrate is more elastic after the drying, with fewer adjacent threads adhering to one another.

The example shown in Fig. 3 only differs from that shown in Fig. 1 in the fact that the operative connection 22 in this case leads from the transport roller 3 to the control device 23.

Accordingly, the driving motor 24 of the dosing pump 11 is controlled by the transport roller 3 in accordance with the angle of rotation.

In the variant shown in Fig. 4 the slide 33 which determines the width of the outlet nozzle gap 9 is only sufficiently flat above the substrate 1 to ensure that the said substrate will still rest against the edge 34 of the said slide 33, regardless of the position occupied by the said slide, thus sealing the outlet nozzle gap 9 still more efficiently.

The invention is not limited to the examples illustrated and described.

Taking into account the fact that the concentrated highly viscous liquor may be present in the form of a liquid or in the form of a foam, as well as the fact that the liquor is then subjected to excess pressure, there are still further possibilities for the application. The application station, contrary to the examples illustrated, may be situated on the lower side of the substrate. The application point may equally well be positioned on a substrate taking a vertical or oblique instead of a horizontal course.

Claims

1. Process for the application of a liquid or foamed concentrated highly viscous liquor on a substrate, particularly warp threads, characterized by the fact that the liquor, subject to excess pressure, is conveyed direct to the substrate, in proportion to the speed of the substrate, and is pressed into the substrate without other counterpressure means, the pressure of the liquor being reduced in the substrate, the foam possibly being destroyed, and the liquor being pressed through the substrate as far as the side facing away from that on which it is applied.

2. Process in accordance with Claim 1, characterized by the fact that the substrate, following the application, is conveyed by internally cooled rollers rotating in the opposite direction to the movement of the substrate.

3. Process in accordance with Claim 1 or 2, characterized by the fact that the substrate, after the application, is conveyed, by its side opposite to that on which the application is effected, over an internally heated drying cylinder.

4. Apparatus for the performance of the process described in one of Claims 1-3, characterized by the fact that an outlet nozzle gap 9 of a liquor tank 10 is provided transversely to the direction of movement of the substrate 1, and resting against one side of the substrate 1 , the concentrated highly viscous liquid or foamed contents of the said tank being kept under pressure by a dosing pump 11 controlled in proportion to the speed of the substrate 1.

5. Apparatus for the performance of the process described in Claim 4, characterized by the fact that an internally cooled roller 26, embraced over part of its periphery by the substrate 1 is provided behind the point of application as viewed in the direction of movement of the substrate 1.

6. Apparatus for the performance of the process described in Claim 4 or 5, characterized by the fact that the application apparatus 4 is followed by a drum dryer 5 of which the first drying drum 16 is embraced by the moving substrate 1 over part of its periphery, by the side facing away from the side of application.

7. Apparatus for the performance of the process described in one of Claims 1 6, characterized by the fact that the outlet nozzle gap 9 rests by its edge 28 against the substrate 1 firmly enough to cause the substrate 1 to change its direction.

8. Apparatus for the performance of the process described in one of Claims 4-7, characterized by the fact that the width of the outlet nozzle gap 9 is adjustable.

9. A process as claimed in Claim 1 substantially as described herein.

1 0. An apparatus for the application of a liquor to a substrate substantially as described with reference to Figures 1 to 3 or Figure 4 of the accompanying drawings.