WO2015176982A1

WO2015176982A1 - Device for drawing off and drawing a synthetic thread group

Info

Publication number: WO2015176982A1
Application number: PCT/EP2015/060327
Authority: WO
Inventors: Markus Stammen
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2014-05-21
Filing date: 2015-05-11
Publication date: 2015-11-26
Also published as: CN106460234A; JP6566969B2; DE112015002341A5; DE102014007454A1; CN106460234B; JP2017516922A

Abstract

The invention relates to a device for drawing off and drawing a synthetic thread group in a melt spinning process. For this purpose, multiple driven godets are provided, at the circumferences of which the thread group is respectively guided with a partial looping. A thread guide rail is arranged on a feed side of the godet, which thread guide rail supports a thread guide for the threads of the thread group. To prevent an excessive contamination of the godet surface by the guided threads, according to the invention the thread guide rail and/or the thread guide is designed to be moveable in the axial direction of the godet for optional adjustment of a thread supply at the circumference of the godets.

Description

Device for drawing and drawing a synthetic yarn sheet

The invention relates to a device for drawing and drawing a synthetic yarn sheet in a melt spinning process according to the preamble of claim 1.

In the production of synthetic threads, it is customary that the freshly extruded threads are drawn off and stretched after cooling through several godets, before the threads are wound into bobbins at the end of the process. At the periphery of the godets, the threads are preferably heated in order to obtain as stretched as possible a plastic state of the thread material. The threads are this done with direct contact on the circumference of the godets to heat the thread material to a predetermined stretching temperature. Such a device for drawing off and drawing a synthetic yarn sheet is known, for example, from WO 2011/009497 A1.

In the known device a plurality of godets are projectingly held on a carrier, wherein a group of threads is guided on the circumference of the godets with a respective partial looping. In practice, it has now been observed that, especially in the area of the thread guide, impurities are formed on the surfaces of the godets on the circumference, which is composed for example of preparation residues or polymer abrasion. However, such contaminants can influence thermal treatment of the yarn at long run times. In that regard, it is known to clean the galette surfaces in certain time cycles. However, such cleaning work basically has the disadvantage that the manufacturing process of the threads must be interrupted. It is therefore an object of the invention to obtain in the generic device for pulling and drawing a synthetic yarn sheet as long as possible without additional cleaning s work on the godet surfaces.

This object is achieved with the features of claim 1. Advantageous developments of the invention are formed by the features of the subclaims and their combinations.

The invention was also not suggested by the known device from DE 101 14 368 AI. So it is common in so-called Klemmliefer- in texturing machines oscillating the thread before hitting a conveyor roller transversely to the thread running back and forth, so that constantly changes a casserole of the thread on the circumference of the conveyor roller. Thus, a homogenization of the surface wear of the feed roller is achieved.

However, such an oscillating movement of the thread is not feasible in the stripping and drawing of synthetic threads in a melt spinning process. The constant movement of the yarn sheet leads to unstable thread runs on the circumference of the godets, which are known to run side by side with relatively small distance parallel.

In contrast, the invention has the particular advantage that the threads of the yarn sheet are always performed with a stationary yarn guide. Only for optional adjustment of a yarn feed at the periphery of the yarn The yarn guide strip and / or the yarn guides are displaceably formed in the axial direction of the godets. The adjustment of the thread guide bar or the thread guide can be performed, for example, in conventional process interruptions, for example, to clean the spinnerets or a yarn breakage. In that regard, a stable threadline for stripping and hiding on the circumference of the godets is guaranteed. However, by the optional adjustment of a yarn feed on the circumference of the ga- lette, the threads can optionally be guided in several jacket zones on the circumference of the godets. Thus, the operating times are extended in which the threads can be guided and treated without significant impairment by impurities on the circumference of the godets.

In order to minimize the outlay on equipment for adjusting the thread guide strip or the thread guide, the development of the invention is preferably carried out in which the thread guide strip and / or the thread guides are each adjustable back and forth between an outer position and an inner position. Thus, already doubling the operating times by setting a predetermined offset between the thread guide positions cause.

An adjustment path extending between the outer position of the thread guide strip or thread guide and the inner position of the thread guide strip or thread guide is preferably carried out smaller than a distance between two adjacent thread guides. This ensures that there is no overlap of the thread traces on the circumference of the godets.

For adjustment, the thread guide strip is preferably held on a carrier plate, which is arranged at a free end of a displaceable piston. is net. Thus, the yarn sheet can be performed during an adjustment cycle by moving the piston.

The piston is guided for adjusting the support plate in a housing and adjustable between the outer position and the inner position.

The adjustment is preferably carried out according to the embodiment of the invention, in which the piston is guided with an end collar in a stepped bore and is stretched between a spring and a formed at the end of the stepped bore pressure chamber. The pressure chamber can be connected via an air connection and a control valve with a compressed air source.

To displace the piston, the control valve is coupled to a control device, by means of which the pressure chamber is vented or vented during a process interruption or after a predetermined time interval.

Since in the inlet of the godets usually an interface between the spinning device and the treatment facilities is provided, which cuts through the yarn sheet at a yarn breakage and leads together to maintain the extrusion process to a waste container, the development of the invention is preferably carried out in which a thread rapier for separating and Collecting the threads of Fadenschnar is held on the support plate. Thus, the yarn sheet at each position of the yarn guide strip under the same conditions in the event of a yarn break collect and vacuum. To adjust the thread guide is provided to arrange the thread guide on a shoe, which is guided in a sliding guide on the thread guide bar. Thus, the thread guides can also change the thread feed alternatively in a stationary yarn guide.

Alternatively, however, there is also the possibility that both systems cooperate, so that both the adjustment of the thread guide and the adjustment of the thread guide bar can be used to change the thread feed on the circumference of the godets. This alternative is preferably chosen with larger thread spacings of adjacent threads, so that an area on the circumference of the godets between two threads by multiple staggered yarn feeds is available.

The invention will now be explained in more detail with reference to some embodiments of the device according to the invention for stripping and stretch Ver a synthetic yarn sheet with reference to the accompanying figures.

They show:

Fig. 1 shows schematically a front view of a first embodiment of the device according to the invention

Fig. 2 shows schematically a side view of the embodiment in the region of the inlet side of the godets

Fig. 3.1

and

FIG. 3.2 schematically shows a top view of the thread guide strip of the exemplary embodiment from FIG. 1 in a plurality of operating situations. FIG

Fig. 4 shows schematically a front view of another embodiment of the device according to the invention

Fig. 5.1

and

FIG. 5.2 schematically shows a cross-sectional view in the region above the

Thread guide bar in different operating situations

FIGS. 1 to 3 show a first exemplary embodiment of the device according to the invention for drawing off and drawing a synthetic yarn bundle in several views, as would be used, for example, in a melt spinning device. FIG. 1 shows the device in a front view, in FIG. 2 in a side view in the area of the thread feed, and in FIGS. 3.1 and 3.2 in a plan view of the thread feed guide. Unless expressly made to any of the figures, the following description applies to all figures.

In Fig. 1 is a schematic front view of the embodiment of the device according to the invention in an operating situation for stripping and drawing a yarn sheet 6 is shown. The embodiment has several godets 4.1 to 4.6, which are held on a mounting wall 1. The godets 4.1 to 4.6 protrude with their respectively driven godet compartments 5.1 to 5.6 on a front side of the mounting wall 1. The godet sheaths 5.1 to 5.6 are designed differently in their diameter and their nature. Thus, directly on an inlet side 10 an unheated galette coats 5.1 of the godet 4.1 is provided, which has a smaller diameter compared to the adjacent godet shrouds 5.2 of the godet 4.2. The godets 4.2 to 4.5 are designed with heated godet sheaths 5.2 to 5.5. Usually, such heated godets are kept isolated in a godet box. To stretch or relax the threads, any speed differences between the individual godets 4.1 to 4.6 can be set.

On a discharge side 29, the godet 4.6 is arranged with a non-heated giletsmantel 5.6.

The arrangement, distribution and number of godets shown in Fig. 1 is exemplary. Essential for the invention is the feeding of the yarn sheet 6, which takes place in this embodiment on the inlet side 10 by a thread guide strip 2. The thread guide strip 2 has to each thread of the yarn sheet 6 each have a separate yarn guide. To explain the thread guide bar 2 is taken in addition to the Fig. 2 and Figs. 3.1 and 3.2 reference. As can be seen in particular from the illustrations in FIGS. 2 and 3.1, a total of four yarn guides 3.1 to 3.4 are held on an elongate sliding shoe 7. The yarn guides 3.1 to 3.4 are U-shaped and formed by a respective ceramic insert 30. The sliding block 7 is held in a sliding guide 8 on the thread guide strip 2 and can be adjusted between an inner stop 9.1 and an outer stop 9.2 in the axial direction of the godet 4.1 back and forth.

In Fig. 2 and Fig. 3.1, the operating situation is shown, in which the sliding block 7 rests against the outer stop 9.2, so that the yarn guides are 3.1 to 3.4 in an outer position. In this position of the thread guides 3.1 to 3.4, the threads of the yarn sheet 6 on the supply side 10 are fed directly to the following godet 4.1. The sliding block 7 remains in this position, so that the thread production takes place with the selected thread feed to the godets 4.1 to 4.6.

In the case of a process interruption, for example, by a maintenance or a thread break, the shoe 7 can be adjusted by a manual adjustment in the direction of the inner stop 9.1 out. This situation is shown in FIG. 3.2. In FIG. 3.2, the yarn guides 3.1 to 3.4 are in an inner position relative to the godet 4.1. The adjustment path extending between the outer position of the yarn guides and the inner position of the yarn guides is indicated in FIGS. 2, 3.1 and 3.2 by the designation V. Likewise, an educated between the adjacent yarn guides 3.1 and 3.2 distance is shown and marked with the letter B. Here, the adjustment path V is made smaller than the distance B between two adjacent yarn guides 3.1 and 3.2. For optimum utilization of the surfaces on the circumference of the godets 4.1 to 4.6, the adjustment path V is preferably made half as large as the distance B between two adjacent yarn guides 3.1 and 3.2. The thread spacings between the yarn guides 3.1 to 3.4 is identical in this embodiment. Thus, by moving the yarn guides 3.1 to 3.4, the yarn feed in the axial direction of the godets is changed by half the yarn spacing. In this way, the operating times at the circumference of the godets 4.1 to 4.6, in particular for thermal treatment, can be substantially increased or no parasitic effects that are undesirable due to contamination occur prematurely.

FIGS. 4, 5.1 and 5.2 show a further exemplary embodiment of the device according to the invention for drawing off and stretching a synthetic yarn sheet in several views. Fig. 4 shows schematically a front view of the embodiment and in Fig. 5.1 and 5.2 is shown in each case a cross section on the feed side of a carrier plate with attached thread guide bar.

In the embodiment shown in Fig. 4, a support plate 11 is movably held on the inlet side 10 on a mounting wall 1. In the upper region, a thread-pulling device 12 is arranged on the carrier plate 11, which device has at least one suction device 13 and a yarn collector 14. Such Fadenraff devices 12 are required to effect yarn separation and collection of the yarn sheet at a yarn breakage of one of the threads within the yarn sheet so that the continuously extruded from the melt spinning yarns threads can be performed without interruption on the suction 13 to a waste container.

Below the thread-pulling device 12, a thread guide strip 2 is arranged, which has a thread guide to each thread of the yarn sheet 6. The design of the thread guide strip 2 will be explained in more detail with reference to FIGS. 5.1 and 5.2. The carrier plate 11 are assigned to the mounting wall 1 a plurality of godets 4.1 to 4.6, which are held in a staggered in this embodiment arrangement on the mounting wall 1. The godets 4.1 to 4.6 are identical to the embodiment of FIG. 1 executed and each project with a rotating godet casing 5.1 to 5.6 on a front side of the mounting wall 1 forth. In principle, the number of unheated and the number of heated godets can vary. So it is also possible to first assign a heated galette on the inlet side 10 of the thread guide bar 12. However, the godet system and the godet assembly is arbitrary regardless of the invention.

In order to be able to set the yarn feed on the circumference of the godet sheaths 5.1 to 5.6 optionally, the yarn guide bar 2 can be adjusted via the movable carrier plate 11 into an outer position or an inner position on the mounting wall 1. FIG. 5.1 shows a cross-sectional view of the carrier plate 11 on the mounting wall 1 with the thread guide strip 2 attached. The thread guide strip 2 has a total of four thread guides 3.1 to 3.4, which are each formed by a U-shaped ceramic insert 30. The number of thread guides on the thread guide strip 2 depends on the number of threads of the guided yarn sheet 6. This is exemplary in this embodiment.

The thread guide strip 2 is cantilevered to the support plate 11. The support plate 11 is connected via a connecting means 16 with the piston 15. The piston 15 is slidably guided within a stepped bore 18 of a housing 19, wherein the piston 15 at the opposite end to the support plate 11 has an end collar 17 of increased diameter. The end collar 17 of the piston 15 can be within the study fenbohrung 18 between an outer stop 9.2 and an inner stop 9.1 back and forth. For this purpose, a pressure chamber 23 is formed between a cover 20 which closes off the stepped bore 18 and the front end on the end collar 17. The pressure chamber 23 is connected via a compressed air connection 21 and a line 22 to a control valve 27. The control valve 27 is coupled to a compressed air source 31, wherein the control valve 27 via a control device 28 for loading or venting of the pressure chamber 23 is controllable. In the operating situation shown in Fig. 5.1, the pressure chamber 23 is vented, so that the piston 15 rests with the end collar 17 on the outer stop 9.2. In this situation, the thread guide strip 2 is held in an outer position to feed the yarn sheet 6 to the following godets 4.1 to 4. 6.

On the side remote from the pressure chamber 23, a spring 24 is arranged on the circumference of the piston 15, which is stretched between the housing 1 and the end collar 17. Thus, after venting the pressure chamber 23, the piston 15 can be displaced by the spring 24 from the outer stop 9.2 towards the inner stop 9.1. This situation is shown in FIG. 5.2.

When vented pressure chamber 23 of the end collar 17 of the piston 15 abuts against the stop 9.1, which is formed in this case by the cover 20. The piston 15 is displaced by the spring 24, so that the carrier plate 11 is held with the thread guide strip in an inner position on the front side of the mounting wall 1. The adjustment path, which is identified in FIG. 5.1 and FIG. 5.2 by the code letter V, is smaller than a distance between adjacent thread guides 3.1 and 3.4. The distance of the thread Guide 3.1 and 3.4 is marked in FIGS. 5.1 and 5.2 with the letter B. With a simple adjustment between the inner position and the outer position of the displacement of the piston 15 is designed such that V = l / 2 B is.

The function for changing the thread feed on the circumference of the godets 4.1 to 4.6 is identical in this embodiment to the aforementioned embodiment of FIG. 1. In that regard, reference is made to the aforementioned functional description.

For larger distances between the adjacent yarn guides on the thread guide strip can be combined advantageously both systems shown in the embodiments for optional adjustment of the yarn feed. For example, the thread guide strip shown in FIG. 5.1 could be replaced by the version of the thread guide strip shown in FIG. 3.1. In this case, a total of four positions of the yarn guide can be optionally set to change the thread feed to the godets. It should be expressly mentioned at this point that the structural design of the thread guide strip and the thread guide is exemplary. It is essential for the invention that the thread feed to the godets on an inlet side in larger time periods, such as may be determined by maintenance cycles or other process interruptions to change.

Claims

claims

1. A device for drawing and stretching a synthetic Fadenschar (6) in a melt spinning process with several driven

Galetten (4.1 - 4.6), at the periphery of the yarn sheet (6) is guided with a Teilumschlingung, and with the godets (4.1 - 4.6) on an inlet side (10) associated with the thread guide strip (2) to each thread of the yarn sheet (6) carries a thread guide (3.1 - 3.4), characterized in that the thread guide strip (2) and / or the thread guides (3.1 - 3.4) for selectively setting a thread guide on the circumference of the godets (4.1 - 4.6) in axial lease of the godets (4.1 - 4.6) are designed to be displaceable.

2. Apparatus according to claim 1, characterized in that the thread guide strip (2) and / or the yarn guides (3.1 - 3.4) are each adjustable between an outer position and an inner position back and forth.

3. A device according to claim 2, characterized in that between the outer position of the yarn guide strip (2) or yarn guide (3.1 - 3.4) and the inner position of the yarn guide strip (2) or yarn guide (3.1 - 3.4) extending adjustment path (V) is smaller as a distance (B) between two adjacent yarn guides (3.1 - 3.4).

4. Device according to one of claims 1 to 3, characterized in that the yarn guide strip (2) on a support plate (11) is held and that the support plate (11) at a free end of a displaceable piston (15) is arranged. Apparatus according to claim 4, characterized in that the piston (15) is guided in a housing (19) and is adjustable between the outer position and the inner position.

Apparatus according to claim 5, characterized in that the piston (15) with an end collar (17) in a stepped bore (18) is guided and tensioned between a spring (24) and formed at the end of the stepped bore (18) pressure chamber (23) , wherein the pressure chamber (23) via an air connection (21) and a control valve (27) with a compressed air source (31) is connectable.

Apparatus according to claim 6, characterized in that the control valve (37) is coupled to a control device (28) through which the pressure chamber (23) is aerated or vented after a time interval.

Device according to one of claims 4 to 7, characterized in that a Fadenraff device (12) for separating and collecting the threads of the yarn sheet (6) on the support plate (11) is held, which is arranged upstream of the yarn guide strip (2).

Device according to one of claims 1 to 8, characterized in that the yarn guides (3.1 - 3.4) are arranged on a sliding block (7), which sliding block (7) in a sliding guide (8) on the thread guide strip (2) is guided.