DE102023000036A1 - Process for producing a fully drawn yarn - Google Patents

Abstract

The present disclosure relates to a method for producing a fully drawn thread (1), wherein a plurality of polymer filaments (2) are spun out by means of a melt spinning device (3), wherein the filaments (2) are bundled into the thread (1) by means of a collecting thread guide (4), wherein the thread (1) is wetted with a pre-preparation agent before it is drawn by means of a pre-preparation device (5), wherein the thread (1) is drawn by means of a drawing device (7) having several godets (6), wherein the thread (1) is wetted with a main preparation agent after it has been drawn by means of a main preparation device (8).The uniformity of the boiling shrinkage properties of the thread (1) are optimized by applying a predetermined proportion of pure, undiluted oil based on the thread weight to the thread (1) by means of the pre-preparation device (5), and wherein a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread (1) so that a proportion of 0.5% to 2.0% of pure, undiluted oil based on the thread weight is achieved in the thread (1) which can be wound into a spool (9).

Description

The present invention relates to a method for producing a fully drawn thread according to the preamble of claim 1, in particular wherein a plurality of polymeric filaments are spun out by means of a melt spinning device, wherein the filaments are bundled into the thread by means of a collecting thread guide, wherein the thread is wetted with a pre-preparation agent before it is drawn by means of a pre-preparation device, wherein the thread is drawn by means of a drawing device having a plurality of godets, wherein the thread is wetted with a main preparation agent after it has been drawn by means of a main preparation device.

In the WO 2011 009 497 A1 discloses such a method for producing fully drawn threads using a drawing, spinning and winding machine. The threads are drawn off dry or in a wetted state with a pre-preparation agent with a low water content of <20%, preferably <10%, using a drawing device. This means that the threads are optionally wetted with the pre-preparation agent between the melt spinning device and the drawing device using a pre-preparation device. It is possible to supply the entire amount of preparation applied to the threads in the process to the thread using several partial preparation applications. For example, a first partial preparation with the aforementioned low water content of <20%, preferably <10%, could be supplied to the thread immediately after spinning and before drawing, namely using the pre-preparation device. A very small amount of preparation agent is used here to improve the running properties of the thread on thread guides and the guide casings of the godets of the drawing device. The wetting required for the post-treatment of the thread is then carried out after stretching and before winding in a second partial preparation, namely by means of the main preparation device.

The application of the preparation agents is not yet optimally designed, so that problems can arise during further processing of the thread, e.g. into a fabric. In particular, the boil-shrink properties of such a thread show irregularities. A thread with uneven boil-shrink properties cannot be dyed evenly. A fabric made from such a thread then shows stripes. It is also conceivable that increased friction losses on thread-guiding components can occur during further processing using a thread made in this way.

From the EP 1 165 868 B1 Various stretching, spinning and winding processes are known for producing different types of threads. A so-called migration nozzle is arranged in front of a stretching device in the thread path, in which the thread is mixed and slightly crossed and, in some cases, prepared without creating knots.

Here, too, the problem of uneven boil-shrinkage properties of the thread arises, with the resulting disadvantages described above. Furthermore, it is also conceivable that increased friction losses on thread-guiding components could occur during further processing using a thread produced in this way.

The present invention is based on the object of providing a method for producing a fully drawn thread which reduces or eliminates the problems of the prior art. In particular, the uniformity of the boiling shrinkage properties of the thread is to be optimized.

This object is achieved by a method according to claim 1.

Further advantageous embodiments are the subject of the subclaims.

More precisely, the object is achieved in that a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread by means of the pre-preparation device and a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread by means of the main preparation device, so that a proportion of 0.5% to 2.0% of pure, undiluted oil based on the thread weight is achieved in the thread that can be wound onto the bobbin.

With such a proportion of 0.5% to 2.0% of pure, undiluted oil based on the thread weight in the thread that can be wound onto the bobbin, optimal friction losses of this thread on the thread-guiding components of the further processing are achieved. Furthermore, the proportion of pure, undiluted oil applied by means of the pre-preparation device based on the thread weight is predetermined with regard to the optimal stretching and subsequent relaxation by means of the stretching device, so that particularly uniform boil-shrinkage properties of the thread are achieved.

Preferably, 0.2% to 0.9% of pure, undiluted oil based on the thread weight applied to the thread. Using the main preparation device, 0.1% to 0.8% of pure, undiluted oil based on the thread weight is applied to the thread.

By means of such a distribution, the desired proportion of 0.5% to 2.0% of pure, undiluted oil based on the thread weight in the thread that can be wound onto the bobbin can be reliably achieved. Furthermore, due to the fact that 0.2% to 0.9% of pure, undiluted oil based on the thread weight is applied to the thread using the pre-preparation device, threads of different diameters / threads of different titres can be produced with a high degree of uniformity in their boil-shrinkage properties. Both threads with a low titre and threads with a high titre can be produced with a high degree of uniformity in their boil-shrinkage properties.

Preferably, the thread is swirled by means of a swirling device and wound into a spool by means of a winding machine.

After the pure, undiluted oil has been applied, the thread is usually first swirled and then wound up using the main preparation device. The swirling creates knots in the thread at certain intervals, which creates a thread closure.

In a preferred embodiment of the method, a pre-preparation agent in the form of pure, undiluted oil is applied to the thread using the pre-preparation device. The thread can thus be heated to the temperature required for stretching and relaxation using very little energy and yet uniformly in the stretching device using the godets. The oil leads to sufficient thread closure during the stretching of the thread. In particular, the oil prevents static charging of the thread filaments or at least reduces it to a tolerable level. Such static charging could lead to an undesirably strong repulsion of the filaments from one another and thus to an undesirably strong swelling of the thread, which in turn would negatively affect the uniformity of the thread properties.

The pure, undiluted oil preferably has a water content of less than 12%, preferably less than 10%, particularly preferably less than 8%. The water content is kept in solution in the oil and is absorbed into the molecular structure of the oil. The lower the water content, the less energy is required to heat the pre-preparation agent in the stretching device. With a particularly low water content, the energy required by the stretching device to achieve the temperatures required for stretching and relaxing the thread can be minimized.

In another embodiment of the method, the main preparation device is used to apply the main preparation agent, which is designed as an oil-water emulsion, to the thread. The oil-water emulsion is a mixture of water droplets and oil, with the water droplets being finely distributed in the oil. By applying such an oil-water emulsion, the subsequent swirling of the thread can be carried out more evenly and with the knots closer to one another. It should be mentioned at this point that the oil contained in the oil-water emulsion also contains a proportion of water dissolved in this oil.

Preferably, the oil-water emulsion is mixed from pure, undiluted oil and water before being applied to the thread. This mixing is preferably carried out in batches to produce a large number of fully drawn threads.

The oil-water emulsion preferably contains 10% to 50% water. This means that the necessary amount of pure, undiluted oil can be applied to the thread and, in addition, an optimal amount of liquid can be applied to the thread for subsequent swirling. The 10% to 50% water does not refer to the proportion of water dissolved in the oil.

According to a further embodiment of the method, the oil-water emulsion is designed as an emulsion with high thread adhesion. Such high thread adhesion can ensure that as much of the oil-water emulsion as possible remains on the thread during further guidance/treatment of the thread and is not shaken off the thread.

Preferably, the thread is wetted between a last godet of the stretching device and a main deflection roller leading the thread to the winding machine by means of the main preparation device and swirled by means of the interlacing device. If the thread does not pass any further components between the main preparation device and the interlacing device, the vibrations generated by the interlacing device in the main preparation device lead to a good distribution of the main preparation agent in the thread. The main preparation agent is then distributed particularly evenly between the filaments of the thread, which has a positive effect on the uniformity of the thread properties, especially its boil-shrinkage properties.

According to a further preferred embodiment of the method, the thread is diverted between the main preparation device and the swirling device by means of an intermediate deflection roller. In this way, the amount of pre- and/or main preparation agent shaken off the thread in the area of the swirling device can be reduced, so that in order to achieve the desired amount of pure, undiluted oil in the thread for further processing, less pre- and main preparation agent needs to be applied to the thread.

Advantageously, in the area of the swirling device, a maximum of 20% to 25% of the amount of pre- and/or main preparation agent applied to the thread is shaken off the thread again by vibrations of the thread. This can be achieved simply by using the emulsion with high thread adhesion. The use of the intermediate deflection roller then leads to a further reduction in the value.

Low energy consumption, especially for compressed air supply, can be achieved if the swirling device is operated at a pressure of 2.5 bar to 3.5 bar to create tangled knots in the thread.

The thread is preferably guided in a single wrap around the godets of the stretching device. In contrast to the multiple wraps of so-called godet duos, the godets can be made shorter. Furthermore, the threads are heated and relaxed more evenly with the single wrap, so that the thread properties of the finished thread are also particularly uniform.

It can be advantageous if the thread is guided in the area of the main preparation device and the swirling device within a post-treatment box. The pre- and/or main preparation agent shaken off the thread is collected within such a post-treatment box and can thus be prevented from uncontrolled distribution. The collected pre- and/or main preparation agent can then be fed into a recycling process. Furthermore, the main preparation device and the swirling device are protected from negative external influences by means of the post-treatment box. The post-treatment box leads to particularly constant ambient conditions in the area of the main preparation device and the swirling device, in particular a particularly constant temperature.

The fully drawn threads are further processed into textile end products.

• 1 zeigt schematisch eine erste Ausführungsform einer Vorrichtung zur Herstellung eines vollverstreckten Fadens in einer Seitenansicht.
• 2 zeigt schematisch eine zweite Ausführungsform einer Vorrichtung zur Herstellung eines vollverstreckten Fadens in einer Seitenansicht.
• 3 zeigt schematisch einen Sammelfadenführer und eine Vorpräparationseinrichtung, wie sie in der ersten und der zweiten Ausführungsform der Vorrichtung zur Herstellung des vollverstreckten Fadens eingesetzt sind, in einer im Gegensatz zu 1 und 2 vergrößerten und um 90° gedrehten Seitenansicht.
• 4 zeigt schematisch den Sammelfadenführer und die Vorpräparationseinrichtung in einer im Vergleich zur 3 vergrößerten Darstellung in der im Gegensatz zu 1 und 2 um 90° gedrehten Seitenansicht.
• 5 zeigt schematisch eine Hauptpräparationseinrichtung in einer Draufsicht auf zwei Fadenführungsnuten dieser Hauptpräparationseinrichtung.

In the following, preferred embodiments are presented in more detail with reference to the accompanying figures.

• 1 shows schematically a first embodiment of a device for producing a fully drawn thread in a side view.
• 2 shows schematically a second embodiment of a device for producing a fully drawn thread in a side view.
• 3 shows schematically a collecting thread guide and a pre-preparation device as used in the first and second embodiment of the device for producing the fully drawn thread, in a 1 and 2 enlarged and 90° rotated side view.
• 4 shows schematically the collecting thread guide and the pre-preparation device in a 3 enlarged representation in which, in contrast to 1 and 2 side view rotated by 90°.
• 5 shows schematically a main preparation device in a plan view of two thread guide grooves of this main preparation device.

The method according to the invention for producing a fully drawn thread 1 is possible both by means of the first and the second embodiment of the device for producing a fully drawn thread 1 from the 1 and 2 executable.

A large number of polymer filaments 2 are first spun out using a melt spinning device 3. The filaments 2 are bundled into the thread 1 using a collecting thread guide 4. The thread 1 is wetted with a pre-preparation agent before it is drawn using a pre-preparation device 5. The thread 1 is drawn using a drawing device 7 having several godets 6. The thread 1 is wetted with a main preparation agent after it has been drawn using a main preparation device 8.

The arrangement and number of godets 6 is chosen here as an example. In contrast to the 1 and 2 shown variants, the use of more or fewer godets 6 than the respective The five godets 6 shown are conceivable. The godets 6 are arranged in a divided box. Three so-called stretch godets are arranged in a first area of the box, two so-called relaxation godets are arranged in a second area of the box. By means of the godets 6, the thread 1 is heated to a temperature required for stretching and subsequent relaxation. The stretching of the thread 1 preferably takes place between the stretching and the relaxation godets. The box makes it possible to achieve particularly uniform ambient conditions in the area of the godets 6, in particular a uniform temperature. By means of the melt spinning device 3, as in 1 and 2 As an example, five threads 1 are spun in parallel and then processed further. It would also be conceivable to produce fewer than five threads 1, e.g. one, or more than five, e.g. 12 to 16 threads 1 in parallel.

In 3 the collecting thread guide 4 and the pre-preparation device 5 are in a 1 and 2 enlarged and rotated by 90° side view. According to the view from 1 and 2 the threads 1 are shown one after the other. In the view from 3 Two of the five threads 1 are shown next to each other. The collecting thread guide 4 and the pre-preparation device 5 are designed here by means of a common component, namely a so-called preparation pin. The filaments 2 are brought together in a thread guide groove 45.F of the collecting thread guide 4 and the pre-preparation device 5 at the same time to form the thread 1 and are wetted by means of the pre-preparation agent. The design of the thread guide groove 45.F is particularly evident from the schematic representation of the collecting thread guide 4 and the pre-preparation device 5 in a 3 enlarged view from 4 In order to prevent the thread 1 from jumping out of the thread guide groove 45.F undesirably, the thread 1 is subsequently guided out of the thread guide groove 45.F as shown in 3 shown, guided by means of a pigtail thread guide 15. 5 shows schematically the main preparation device 8 in a plan view of two thread guide grooves 8.F of this main preparation device 8. Also in this view from 5 Two of the five threads 1 are shown next to each other.

By means of the pre-preparation device 5, a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread 1 and by means of the main preparation device 8, a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread 1, so that a proportion of 0.5% to 2.0% of pure, undiluted oil based on the thread weight is achieved in the thread 1 which can be wound into a spool 9.

This proportion of pure, undiluted oil in relation to the thread weight can be calculated, for example, from the operating data of the device for producing the fully drawn thread 1 and/or determined by measuring a thread 1 of a certain length. During the measurement, the thread 1 and the pre- and main preparation agents must be separated from one another. Furthermore, for the measurement, the pure, undiluted oil must be separated from other components of the pre- and main preparation agents. The common and individual masses are then determined accordingly before and after these separations.

By means of the pre-preparation device 5, 0.2% to 0.9% of pure, undiluted oil based on the thread weight is applied to the thread 1. By means of the main preparation device 8, 0.1% to 0.8% of pure, undiluted oil based on the thread weight is applied to the thread 1.

For this purpose, a pump belonging to the pre-preparation device 5 is operated with a corresponding throughput, which depends on further operating data of the device for producing the fully drawn thread 1, such as a thread speed in the area of the pre-preparation device 5. Furthermore, a pump belonging to the main preparation device 8 is operated with a corresponding throughput, which depends on further operating data of the device for producing the fully drawn thread 1, such as a thread speed in the area of the main preparation device 8.

The thread 1 is swirled by means of a swirling device 10, in particular after the wetting of the thread 1 by means of the main preparation device 8. The thread 1 is then wound up into the spool 9 by means of a winding machine 11.

By means of the swirling device 10, knots are created in the thread 1 at certain intervals to create a thread closure, whereby the filaments 2 of a thread 1 are held together by means of the knots. Threads 1 wound into spools 9 can be packaged and fed to various types of further processing machines, e.g. for the production of fabrics.

By means of the pre-preparation device 5, a pre-preparation agent in the form of pure, undiluted oil is applied to the thread 1. The pure, undiluted oil has a water content of less than 12%, preferably less than 10%, particularly preferably less than 8%.

The main preparation agent in the form of an oil-water emulsion is applied to the thread 1 by means of the main preparation device 8. The oil-water emulsion is mixed from pure, undiluted oil and water before being applied to the thread 1. The oil-water emulsion contains 10% to 50% water and is designed as an oil-water emulsion with high thread adhesion.

The thread 1 is wetted between a last godet 6 of the stretching device 7 and a main deflection roller 12 leading the thread 1 to the winding machine 11 by means of the main preparation device 8 and swirled by means of the swirling device 10. The main deflection roller 12 is arranged laterally next to the winding machine 11. The thread 1 is thus fed to the winding machine 11 from one side of the winding machine 11, so that a particularly small vertical distance can be achieved between the winding machine 11 and the stretching device 7.

The thread 1 is produced according to the second embodiment of the device for producing the fully drawn thread 1 from 2 between the main preparation device 8 and the swirling device 10 by means of an intermediate deflection roller 13. The thread 1 is deflected by approximately 90° at the intermediate deflection roller 13.

In contrast, the main preparation device 8 and the intermingling device 10 according to the first embodiment of the device for producing the fully drawn thread 1 are made of 1 arranged directly one behind the other in the thread path.

In the area of the swirling device 10, a maximum of 20% to 25% of the amount of pre- and/or main preparation agent applied to the thread 1 is shaken off the thread 1 again by vibrations of the thread 1. This is achieved on the one hand by the oil-water emulsion with high thread adhesion and on the other hand by the fact that the swirling device 10 is operated with a (low) pressure of 2.5 bar to 3.5 bar to create tangled knots in the thread 1.

The thread 1 is guided in a simple loop around the godets 6 of the stretching device 7. The five threads 1 shown as an example are guided parallel to the godets 6 and, after the main deflection roller 12, are spread out onto winding stations of the winding machine 11 that are arranged next to one another.

The thread 1 is guided in the area of the main preparation device 8 and the intermingling device 10 within a post-treatment box 14. According to the second embodiment of the device for producing the fully drawn thread 1 from 2 the intermediate pulley 13 is also arranged within the post-treatment box 14

List of reference symbols

1

thread

2

Filaments

3

Melt spinning device

4

Sarnmel thread guide

5

Pre-preparation facility

45.F

Thread guide groove of the collecting thread guide 4 and the pre-preparation device 5

6

Galettes

7

Stretching device

8th

Main preparation facility

8.F

Thread guide groove of the main preparation device 8

9

Kitchen sink

10

Turbulence device

11

Rewinding machine

12

Main pulley

13

Intermediate pulley

14

Aftercare box

15

Pigtail thread guide

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• WO 2011009497 A1 [0002]
• EP 1165868 B1 [0004]

Claims (15)

Method for producing a fully drawn thread (1), wherein a plurality of polymer filaments (2) are spun out by means of a melt spinning device (3), wherein the filaments (2) are bundled into the thread (1) by means of a collecting thread guide (4), wherein the thread (1) is wetted with a pre-preparation agent before it is drawn by means of a pre-preparation device (5), wherein the thread (1) is drawn by means of a drawing device (7) having several godets (6), wherein the thread (1) is wetted with a main preparation agent after it is drawn by means of a main preparation device (8), characterized in that a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread (1) by means of the pre-preparation device (5), and wherein a predetermined proportion of pure, undiluted oil based on the thread weight is applied to the thread (1) by means of the main preparation device (8). so that a proportion of 0.5% to 2.0% of pure, undiluted oil based on the thread weight is achieved in the thread (1) which can be wound into a spool (9). Procedure according to Claim 1 , characterized in that 0.2% to 0.9% of pure, undiluted oil based on the thread weight is applied to the thread (1) by means of the pre-preparation device (5), and 0.1% to 0.8% of pure, undiluted oil based on the thread weight is applied to the thread (1) by means of the main preparation device (8). Procedure according to Claim 1 or 2 , characterized in that the thread (1) is swirled by means of a swirling device (10), wherein the thread (1) is wound onto the spool (9) by means of a winding machine (11). Method according to one of the preceding claims, characterized in that by means of the pre-preparation device (5) a pre-preparation agent in the form of pure, undiluted oil is applied to the thread (1). Process according to one of the preceding claims, characterized in that the pure, undiluted oil has a water content of less than 12%, preferably less than 10%, particularly preferably less than 8%. Method according to one of the preceding claims, characterized in that the main preparation agent in the form of an oil-water emulsion is applied to the thread (1) by means of the main preparation device (8). Procedure according to Claim 6 , characterized in that the oil-water emulsion is mixed together from pure, undiluted oil and water before being applied to the thread (1). Procedure according to Claim 6 or 7 , characterized in that the oil-water emulsion contains 10% to 50% water. Procedure according to Claim 6 until 8th , characterized in that the oil-water emulsion is designed as an emulsion with high thread adhesion. Procedure according to one of the Claims 3 until 9 , characterized in that the thread (1) is wetted by means of the main preparation device (8) between a last godet (6) of the stretching device (7) and a main deflection roller (12) guiding the thread (1) to the winding machine (11) and is swirled by means of the swirling device (10). Procedure according to one of the Claims 3 until 10 , characterized in that the thread (1) is deflected between the main preparation device (8) and the swirling device (10) by means of an intermediate deflection roller (13). Method according to one of the Claims 3 until 11 , characterized in that in the region of the swirling device (10) a maximum of 20% to 25% of the amount of pre- and/or main preparation agent applied to the thread (1) is shaken off the thread (1) again by vibrations of the thread (1). Procedure according to one of the Claims 3 until 12 , characterized in that the swirling device (10) is operated with a pressure of 2.5 bar to 3.5 bar to produce tangled knots in the thread (1). Method according to one of the preceding claims, characterized in that the thread (1) is guided in a simple loop around the godets (6) of the stretching device (7). Procedure according to one of the Claims 3 until 14 , characterized in that the thread (1) is guided in the region of the main preparation device (8) and the swirling device (10) within a post-treatment box (14).

Images