GB2196880A

GB2196880A - Apparatus for sizing a thread bundle

Info

Publication number: GB2196880A
Application number: GB08720546A
Authority: GB
Inventors: Gerhard Voswinckel; Peter Ruch
Original assignee: Mueller Franz Co KG GmbH; SUCKER GEB
Current assignee: Mueller Franz Co KG GmbH; SUCKER GEB
Priority date: 1986-10-03
Filing date: 1987-09-01
Publication date: 1988-05-11
Also published as: IT1231412B; JPS6399370A; DE3633659A1; FR2604733A1; GB8720546D0; IT8721985A0

Abstract

Apparatus for sizing a thread bundle (1), comprises cooperating squeezer rolls (3, 5), in which a squeezer roll (3) dips into a size trough (7) and in which the sized thread bundle is conducted through the squeazer gap (4) of the squeezer rolls. The common tangent (13) of the squeezer rolls adjoining one another in the squeezer gap is orientated into the size trough (7) and the thread bundle is supplied from below into the squeezer gap. A size sprinkler (10) is associated with the gore situated before the squeezer gap. In this way, in spite of very high thread speeds, uniform distribution of the size onto the body of the threads may be achieved and in which special means for deflecting size sprayed back from the roll gap are not necessary. <IMAGE>

Description

SPECIFICATION Application apparatus for sizing a thread bundle and method of operating such- an apparatus This invention relates to an application apparatus for sizing a thread bundle, comprising cooperating squeezer rolls, in which at least one squeezer roll dips as dip roll into a size trough and in which the sized thread bundle is conducted through at least one squeezer gap formed between two squeezer rolls.

In sizing machines, the thread bundle to be sized, in general a warp thread, is conducted via a dip roll through a size trough containing the liquid size. Excess size adhering to the thread bundle is then squeezed away by means of a pair of cooperating rolls, the squeezed away size running back into the size trough or the like. A squeezer roll pair suitable for this purpose may consist of a dip roll immersed only partly in the size bath and of a further squeezer roll cooperating therewith.

The squeezer gap is disposed above the surface of the liquid in the size trough. In this use of one squeezer roll also as dip roll, two arrangements are normally considered. Either the thread bundle is conducted only between the rolls or it is pulled around the one roll entirely through the liquid. Both methods are used in the sizing of warps.

By the use of the dip rolls also as a part of a squeezer roll pair, the cost of manufacture of the sizing plant is reduced. At the high speeds of modern machines of more than 120 m/min at 100 to 120 cP and 300 m/min and more at 10 to 50 cP, the simplified apparatuses can, however, be used only to a limited extent, because the size expelled in the squeezer gap of the squeezer roll pair splashes back with increasing thread velocity and according to the viscosity, and fitting spray preventer plates become necessary for capturing the sprayed size. Such spray preventer plates, however, interfere with access to the squeezer roll assembly and the size trough.

The objective of this invention is to provide a sizing plant having squeezer rolls intended also for application of size, in which plant, in spite of very high thread speeds, a uniform distribution of the size onto the body of threads may be achieved and in which special means for deflecting size sprayed back from the roll gap are not necessary.

The solution according to this invention consists, for the initially named application apparatus having at least one squeezer roll constructed as a dip roll and at least one squeezer gap, in that the common tangent of the rolls adjacent to one another at the squeezer gap is orientated into the size trough, that the thread bundle is fed from below to the squeezer gap and that a size sprinkler is associated with the gore situated before the squeezer gap.

By the invention the result is achieved that the entry side of the squeezer gap, with rolls cooperating, faces downwards and in spite of a correspondingly shallow depth of dip of the dip roll a sufficient degree of sizing can be achieved, because the thread bundle to be treated is to be loaded with size until immediately before entry into the squeezer gap. In the apparatus of this invention, the thread bundle can be charged with size by sprinkling, for example by spraying, with size from below upwards into the gore, as well as via the dip roll, and in particular also where the supply is inadequate after a stoppage.

According to a further aspect of the invention, the depth of dip of the dip roll can be predetermined if a trough that can be vertically raised or lowered is provided beneath thesqueezer roll pair or if pumping means for raising or lowering the liquid level are associated with the size present in the trough. The trough may, for example, be mounted pivotal about an axis parallel to the axes of the squeezer rolls. In this manner, without any notable application of force, a fine adjustment of the depth of dip and thus of the degree of size entrainment on the dip side may be achieved. The quantity of size applied by sprinkling may, of course, also be predetermined.

To enable the combined dip/squeezer roll assembly to be used for sizing a thread bundle even at the highest thread speeds, a further squeezer roll is connected before the squeezer roll pair, cooperating in squeezing with one of the two rolls of the pair. The thread bundle is then conducted through two gores located one behind the other. The feed of size takes place in the first gore by a shower-like sprinkler apparatus and in the second gore by the dip wetting of the last squeezer roll. The two last rolls are so associated with each other that their common tangent in the region of the squeezer gap is directed into the size trough situated beneath in such a manner that size sprayed back is reflected into the size trough.

Details of the invention are explained by reference to the schematic illustration of examples of embodiment thereof. The figures in the drawings show: Figure 1 a cross-section through a size application apparatus having combined dip/squeezer rolls, wherein the first squeezer roll constitutes the dip roll; Figure 2 a size application apparatus according to Fig. 1, wherein however the second squeezer roll passed over by the thread bundle constitutes the dip roll; Figure 3 a size application apparatus as in Fig. 1 or 2, amplified by a further squeezer roll forming a gore.

In the example of embodiment according to Fig. 1, a thread bundle 1 runs over a feed roll 2 to a dip roll 3 and thence through a squeezer gap 4 to a squeezer roll 5, cooperating with the dip roll 3 in the sense of a squeezer roll pair, in the direction of arrow 6 to the next unit of the sizing plant. The dip roll 3 dips to a relatively slight extent into the liquid 8 present in a size trough 7. A sprinkler or spray installation 10, which may be supplied from the size trough via a pump 11, is associated with the gore 9 between the squeezer rolls 3 and 4, into which the thread bundle 1 enters from below, that is to say from the size trough 7.

An important aspect here is that the thread bundle 1 enters the squeezer gap 4 from below, that is to say from the direction of the liquid 8 present in the trough 7, in such a manner that liquid sprayed back in the direction of arrow 12, even at the highest thread speed, arrives exclusively in the trough 7 generally in the direction of the common tangent 13 to the rolls 3 and 5 in the squeezer gap 4, without any protective measures. In this manner, a thread bundle 1 can be uniformly thoroughly sized by means of a combined dip/squeezer roll assembly, without precautionary measures for deflecting backsplashed size being necessary.

In the example of embodiment according to Fig. 2, the thread bundle 1 is conducted first around a squeezer roll 14 and only then around a dip roll 15. It will be seen here that the thread bundle 1 does not come directly into contact with the liquid 8 contained in the trough 7, if the liquid surface 16 in the trough 7 touches only the dip roll 15, but not the other squeezer roll 14. If, however, the level of the liquid 8 in the trough 7 is raised sufficiently for the liquid surface 1 7 to touch also the first squeezer roll 14, then the thread bundle 1 Is conducted to the squeezer gap 4 partly through dipping and partly through a surface film 18 of the dip roll 15. The surface film 18 comes into contact In the squeezer gap 4 to a degree that normally is sufficient for sizing the thread bundle 1.It is only when very large quantities need to be applied that it may be advisable to cause the thread bundle to come into contact also with the upper liquid level 17 of the liquid mixture 8. The two rolls 15 and 14 of the squeezer roll pair are so associated with each other according to Fig. 2 also that their common tangent 13 in the region of the squeezer gap 4 is orientated into the liquid trough 7 and liquid splashing back in the direction of arrow 12 falls solely into the trough 7.

The amount of size feed and therefore the levels 16 and 17 respectively of the liquid 8 may be modified in the device according to Fig. 2 (as also in those of Figs. 1 or 3) by raising or lowering the trough 7 or by tilting the trough about an axis parallel to the axes 19, 20 of the rolls 14 and 15.

Fig. 3 shows an example of embodiment of an application apparatus similar to Fig. 2 with a third squeezer roll 21 connected before the rolls 14 and 15 pressed against each other in the squeezer gap 4. This squeezer roll, the first to be passed over by the thread bundle 1 in the direction of travel 6, is usually disposed somewhat higher than the second squeezer roll. Into the upwardly open gore 23, between the third squeezer roll 21 and the second squeezer roll 14 above the associated squeezer gap 22, a size shower 24 is also directed according to Fig. 3, by means of which, for example by a pump 25 pumping up from the trough 7, liquid 8 can be introduced into the gore 23. By the pre-treatment of the thread bundle by means of the shower 24, the size absorption capability of the individual thread is increased, so that the highest operating speeds can be used even with a very dense warp.

With the example of construction according to Fig. 3, on account of the pre-sizing in the first, upwardly open gore, a somewhat more intense sizing can be achieved that with the arrangements according to Figs. 1 and 2, even with very dense warps. An important advantage of all the examples of embodiment described here consists in the fact that the thread bundle 1 can be introduced very accurately into the squeezer gap 4 or into the first and second squeezer gaps 22 and 4, because a displacement of the individual threads relative to one another when passing through a liquid bath cannot occur. A tight guidance of the warp is therefore achieved automatically by the guiding of the thread bundle according to this invention.

Claims

1. Application apparatus for sizing a thread bundle (1), comprising cooperating squeezer rolls, in which at least one squeezer roll dips as a dip roll into a size trough and in which the sized thread bundle is to be conducted through at least one squeezer gap of two squeezer rolls, characterized in that the common tangent of the squeezer rolls adjoining one another in the squeezer gap is orientated into the size trough, that the thread bundle is to be supplied from below into the squeezer gap and that a size sprinkler is associated with the gore situated before the squeezer gap.

2. Application apparatus according to Claim 1, characterized in that the first roll around which the thread bundle passes is constructed as dip roll.

3. Application apparatus according to Claim 1, characterized in that the second roll around which the thread bundle passes is constructed as dip roll (Fig. 2).

4. Application apparatus according to Claim 1, characterized in that the level of the size in the size trough is pre-adjustable as desired to a lower level, at which only one roll is immersed, and to an upper level, at which a second roll is immersed.

5. Application apparatus according to one or more of Claims 1 to 4, characterized in that, before a squeezer roll pair having a common tangent at the squeezer gap orientated into the trough in the direction of conveying of the thread bundle, a further squeezer roll is disposed, and that a size sprinkler apparatus constructed as a shower is directed into the gore between this further roll and the adjacent squeezer roll of the squeezer roll pair.

6. Application apparatus as claimed in Claim 1, substantially as described with reference to Fig. 1, Fig. 2 or Fig. 3 of the accompanying drawing.