DE102018002449A1 - Method of melt spinning and winding a synthetic thread - Google Patents

Abstract

There is described a method of melt spinning and winding a synthetic thread, in which the yarn is fed immediately prior to winding with a plurality of wraps on the circumference of a driven galette of a godet unit and in which a peripheral speed of the godet is controlled by a predetermined speed of a godet drive. In order to be able to wind coils as possible with specific thread lengths, according to the invention at the beginning of the winding of a coil, a thread length of the coil is set, which is converted into a running time of the godet at the predetermined speed and in which at the end of the life of the godet one end of the winding Coil is initiated.

Description

The invention relates to a method for melt-spinning and winding a synthetic thread according to the preamble of claim 1.

In the production of synthetic filaments in a melt-spinning process, it is common that after extruding, cooling and treating the filament, it is wound into a spool. In this case, the thread is guided on the circumference of godets, which are operated at predetermined peripheral speeds in order to set certain thread tensions, for example, for drawing or swirling on the thread. So that the thread can be produced without interruption in the melt-spinning process, the coils produced are preferably changed when a predetermined coil diameter is reached. In a further processing, the thread is then withdrawn from the spool again.

A generic method for melt spinning and winding a synthetic thread is, for example, from DE 199 11 704 A1 out. In the known method, the thread is guided before winding on a driven godet of a godet unit, which is looped around several times by the thread. Here, the godet is driven at a predetermined peripheral speed. The bobbin wound by the thread continuously determines the bobbin diameter. It is usual that a bobbin change is performed when a predetermined maximum bobbin diameter is reached. The finished wound coils are then fed to a further treatment or a subsequent process.

In particular, in the production of crimped threads, which are used for example by the melt spinning process by a tufting process or by weaving directly for the production of carpets, it is common that coils with different thread types are used in parallel side by side in a manufacturing process. Although the coils have an identical outer diameter, however, result in different thread lengths, the excess thread lengths must be disposed of as waste. Therefore, there is a desire to always produce the coils with the same thread lengths in a melt spinning process.

In principle, methods for producing coils with the same run length are known in the prior art and, for example, in US Pat DE 34 03 232 A1 disclosed. In this case, however, additional measuring means associated with the winding, which must be integrated into the threadline and thus lead to an additional thread load.

It is therefore an object of the invention to provide a generic method for melt spinning and winding a synthetic thread, in which the wound coils have a defined thread length and in which the leadership of the thread takes place without additional measuring means.

This object is achieved by a method having the features of claim 1 and a method having the features of claim 2.

Advantageous developments of the invention are defined by the features and feature combinations of the subclaims.

The invention is based on the recognition that in a winding upstream godet unit with multiple wrap the speed of the galette represents a measure of a dispensed amount of thread of the thread. Thus, it is known that due to multiple wrapping, the thread runs off the surface of the godet without slippage. Thus, with each rotation of the godet, a length dimension of the thread corresponds to the circumference of the godet. So it is possible to specify a thread length of the coil at the beginning of winding a coil. The yarn length of the coil can be converted directly into a running time of the godet with a predetermined speed, so that at the end of the life of the godet one end of the winding of the coil is initiated.

However, the object of the invention can also be solved by the fact that at the beginning of the winding of a coil a running time of the godet at the predetermined speed is detected continuously and that at the end of the winding of the coil, the achieved transit time of the godet is converted into a thread length of the coil. Thus, the wound thread length is determined within the coil.

The invention has the particular advantage that no additional auxiliary equipment is required in the melt spinning process in order to produce bobbins with, for example, constant thread lengths.

Im Fall einer bestimmten Laufzeit der Galette lässt sich die Fadenlänge L aus der Formel L = T · π · d · n berechnen. Der Kennbuchstabe d bezeichnet den Durchmesser der Galette, der Kennbuchstabe n bezeichnet die Drehzahl der Galette und der Kennbuchstabe T die Laufzeit der Galette.With known diameter of the godet and the drive speed, the running time of the godet or the thread length L of the coil can be determined in a simple manner by a calculation formula. Thus, the running time for a given thread length results from the relationship $\text{T}=\frac{\text{L}}{\mathrm{\pi }\text{d n}},$

In the case of a certain transit time of the godet, the thread length L can be calculated from the formula L = T · π · d · n. The code letter d denotes the diameter of the godet, the code letter n denotes the Speed of the godet and the code letter T the running time of the godet.

Since in an automated bobbin change by a winding turret of the take-up further auxiliary devices must be active to sever the thread, the process variant is particularly advantageous in which a waiting time for guiding the coil in a cutting position for severing the thread predetermined or at a first winding of Coil is calculated. Thus, the non-productive times can be recorded, in which the thread is still stored on the circumference of the coil.

The detection of the non-productive time is further improved by specifying a start-up time for an operation of an auxiliary device for cutting the thread wound on the spool, or measured at a first winding of the spool.

The finally wound coil can then be assigned to an actual thread length, which is calculated from a total winding time, the diameter of the godet and the speed of the godet drive.

The total winding time results from the sum of the running time of the godet, the waiting time for guiding the spool in the cutting position and the acceleration time for an operation of an auxiliary device. This variant of the method is particularly advantageous in the case in which a predetermined thread length of the coil is used to determine a running time of the godet.

Moreover, it is also possible to correct the actual thread length of the wound bobbin with a length of the thread to be traversed between the godet and the cutter from the thread. For exact length determinations of the thread length of the coil are possible.

In order to obtain the most stable yarn guide and a stable yarn tension during winding, the process variant is preferably carried out, in which the yarn is swirled before casserole on the godet by means of compressed air and in which set a thread tension on the thread by a godet in upstream thread unit becomes. This increases the accuracy of the thread length determination during operation.

By an additional yarn tension measurement between the godet units, it is possible to control the yarn tension set between the godet units and thus to obtain a stable yarn length determination during the melt spinning process.

By the process variant in which the thread is stretched before swirling in one or more stages, can also avoid excessive elasticity of the thread.

The method according to the invention is thus suitable for every melt spinning process for the production of different types of yarn such as BCF, IDY, POY or FDY. Essential here is the leadership of the thread before winding by a multiple looped galette.

The method according to the invention will be explained in more detail below with reference to several embodiments of a melt spinning process with reference to the attached figures.

In the 1 an embodiment of a melt spinning device for melt spinning and winding a synthetic thread is shown schematically. The embodiment has a spinning device 1 on, on a spinning beam 1.1 a spinneret 1.2 wearing. The spinneret 1.2 is at the bottom of the spinner 1.1 held, with the spinning beam 1.1 is heated. Inside the spinner 1.1 are further not shown here melt-carrying parts such as lines integrated, via a melt inlet 1.3 is connected to a melt source, for example an extruder. The melt feed 1.3 flows into a spinning pump 1.4 that with the spinneret 1.2 connected is.

Below the spinning device 1 is a cooling device 2 provided below the spinneret 1.2 a cooling shaft 2.1 forms. The cooling shaft 2.1 is a bubble chamber 2.2 assigned to generate a cooling air flow. At the end of the cooling shaft 2.1 is a collection thread guide 5 provided by which a plurality of filaments 3 coming from the nozzle orifices of the spinneret 1.2 are extruded after cooling to a thread 4 merge.

Below the cooling device 2 is a treatment facility 6 intended. The treatment facility 6 has in each case for the production of the desired thread type several treatment units. In this embodiment, symbolically two galette units 6.1 and 6.2 shown, for example, to produce a stretched thread. Basically, in the treatment facility 6 Also be integrated dissection equipment, turbulators, crimping devices, cooling devices and other godet devices. For example, crimped threads (BCF), technical threads (IDY) or textile threads (FDY) can be produced. The execution of the treatment facility 6 however, is not relevant to the invention.

Below the treatment facility 6 are a godet unit 7 and a take-up device 8th arranged. The galette unit 7 consists of a powered galette 7.1 and an overflow roll 7.3 , both of them repeatedly from the thread 4 are entwined. The godet 7.1 is via the godet drive 7.2 powered by a godet control unit 7.4 connected is.

The winding device 8th points directly below the godet unit 7 a head thread guide 8.6 on, which forms the end of a traversing triangle for winding the thread. The head thread guide 8.6 follows a traversing unit 8.4 through which the thread 6 is guided back and forth within a traverse stroke. The traversing unit 8.4 is a pressure roller 8.3 assigned to the thread 4 on the circumference of a coil 9 store. The sink 9 is on a winding spindle 8.1 wound.

The winding device 8th has two winding spindles 8.1 on, attached to a rotatable spool turret 8.2 are held. The winding spindles 8.1 be through the winding turret 8.2 alternately guided in an operating area and a change area to make an automatic bobbin change can. The winding device 8th is a winding control unit 8.5 assigned, which is connected to the drives, not shown here.

The winding control unit 8.5 and the godet control unit 7.4 are with a control device 10 connected.

For carrying out the method according to the invention, the control device 10 a desired thread length L of the coil to be wound 9 given up. Within the control device 10 can the predetermined thread length L with the help of a running time T of the godet 7.1 transfer at a predetermined speed n. For this purpose, the term T with the aid of the diameter d of the godet 7.1 and calculated using the predetermined speed n from the thread length L. Because the thread 4 on the circumference of the godet 7.1 without slippage, the formula applies $\text{T}=\frac{\text{L}}{\mathrm{\pi }\text{d n}},$

The diameter of the godet 7.1 is here designated by the letter d. In that regard, exactly the time T of the godet can be predetermined, the desired thread length L of the coil 8.1 equivalent. Once the term T of the godet 7.1 is reached, via the control device 10 and the winding control unit 8.5 initiated a bobbin change.

To the rewinder 8th To perform a bobbin change, the thread must 4 from the coil 9 on the adjacent winding spindle 8.1 be handed over. For this purpose, the winding turret 8.2 at first pivoted to the coil 9 in a cutting position, not shown here for cutting the thread 4 to move. The time required to guide the winding spindle 8.1 with the coil 9 is referred to here as the waiting time T _W. During the waiting time T _W , the thread is 4 continue on the circumference of the coil 9 wound.

Once the coil 9 has reached the cutting position, an auxiliary device, not shown here for cutting the on the coil 9 wrapped thread 4 actuated. The time until the thread is cut 4 is referred to here as run-up time TH. During the ramp-up period TH becomes the thread 4 continue on the circumference of the coil 9 wound.

The finished coil 9 thus has an actual yarn length L _Ist , which is slightly larger than the predetermined yarn length L for determining the running time of the godet 7.1. Thus, the finished wound coil can be 9 an actual yarn length L _is assigned, which is calculated from a total winding time W, the diameter of the godet d and the rotational speed n of the godet drive according to the formula L = W · π · d · n. The total winding time W can be calculated from the sum of the transit time T, the waiting time T _W and the ramp-up time T _H. We have W = T + T _W + T _H.

As from the illustration in 1 shows, is the galette 7.1 at a distance from the take-up device 8th arranged. In that regard, it is possible to correct the actual thread length of the wound coil with a length of the thread extending between the godet 7.1 and the winding device 8th in particular adjusts a cutting device, not shown here. This is an exact determination of the thread length of the coil 9 possible.

At the in 1 illustrated embodiment of the melt spinning device, there is the possibility that the godet 7.1 supplied thread 4 may be subject to fluctuations in its yarn tension. However, such fluctuations in the thread tension lead to inaccuracies in the determination of the thread length of the coil. In that regard, the melt spinning device is particularly advantageous, in which the godet unit 7 a post-treatment of the thread is arranged in the form of a vortex.

In the 2 For this purpose, another embodiment of a melt spinning device is shown schematically in a side view. The embodiment according to 2 is essentially identical to the embodiment according to 1 so that only the differences are explained below.

According to the embodiment 2 is a swirling device 11 the godet unit 7 upstream. The string 4 is through one of the swirling device 11 upstream godet unit 12 fed between the godet unit 12 and the godet unit 7 a predetermined thread tension is set. For this purpose, the godet unit 12 a powered galette 12.1 , a godet drive 12.2 and an overflow roll 12.3 on. The godet drive 12.2 is with a godet control unit 12.4 connected. The godet control units 7.4 and 12.4 are with the control device 10 connected. Thus, a predetermined speed ratio between the godet units can be achieved 12 and 7 adjust, so that as constant a thread tension on the godet 7.1 acts.

At the in 2 could be the determination of the thread length L of the wound coil 9 be determined directly from a running time T of the godet. Thus, for example, at the beginning of the winding of the coil 9 via the control device 10 the term T of the godet 7.1 continuously record. The godet 7.1 is doing with constant speed n through the godet drive 7.2 driven. The end of the winding of the spool 9 , which is defined, for example, a coil diameter reached the coil or by reaching a predetermined winding time, the control device 10 above the winding control unit 8.5 given up. The control device 10 Thus, at the end of the winding of the coil 9 the term T of the godet 7.1 in a thread length L of the coil 9 transfer. The exact determination takes place via the formula L = T · π · n · d. This allows the coil 9 assign a thread length. The time that determines the end of the winding, this could be determined by the cutting device. In that regard, in this case, the entire winding time would be identical to the life of the godet. The exact actual thread length of the spool 9 after correction, taking into account the length of the thread 4 between the galette 7.1 and the winding device 8th result.

Is during the winding of the coil, the peripheral speed of the godet 7.1 changed, this change can be readily considered mathematically directly. In each case, only the time duration is to be detected, in which the respective speeds of the godet during the winding of the thread have worked.

For further improvement of the method according to the invention could in the embodiment according to 2 in the zone between the galette units 7 and 12 be integrated with a yarn tension measuring device. The measured thread tension could then be used to control the godet drive 12.2 the galette 12.1 be used to a constant thread tension between the godets 12.1 and 7.1 to obtain.

The galette units shown in the embodiments of the melt spinning devices 7 each have a driven galette and a freely rotatable overflow roller. In principle, a second driven godet can be used instead of the overrun roller. It is important for the method according to the invention that the thread runs off the last godet without any slip phenomena.

The method according to the invention can therefore be used flexibly to produce coils with predetermined yarn running lengths or with wound yarn running lengths. In principle, the method can be used in any melt-spinning process in which the winding of the coils is preceded directly by a godet with multiple entanglements. Such godet processes can be used to produce various yarn types such as BCF, IDY or FDY.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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 assumes no liability for any errors or omissions.

Cited patent literature

• DE 19911704 A1 [0003]
• DE 3403232 A1 [0005]

Claims (11)

A method for melt spinning and winding a synthetic thread, wherein the yarn is guided immediately before winding with a plurality of wraps on the circumference of a driven galette of a godet unit and in which a peripheral speed of the godet is controlled by a predetermined speed (n) of a godet drive, characterized in that at the beginning of the winding of a bobbin, a thread length (L) of the bobbin is predetermined, that the thread length (L) is converted into a running time (T) of the godet at the predetermined speed (n) and that at the end of the running time (T) the godet one end of the winding of the coil is initiated. A method for melt spinning and winding a synthetic thread, wherein the yarn is guided immediately before winding with a plurality of wraps on the circumference of a driven galette of a godet unit and in which a peripheral speed of the godet is controlled by a predetermined speed (n) of a godet drive, characterized in that, at the beginning of the winding of a bobbin, a running time (T) of the godet at the predetermined speed (n) is detected continuously and at the end of the winding of the bobbin, the running time (T) of the godet is converted into a yarn length (L) of the bobbin becomes. Method according to Claim 1 , characterized in that the running time (T) of the godet or the thread length (L) of the coil by means of a diameter of the godet (d) and the rotational speed (n) according to the formulas $\text{T}=\frac{\text{L}}{\mathrm{\pi }\text{d n}}$

or L = T · π · d · n. Method according to one of Claims 1 to 3 , characterized in that a waiting time (T _W ) for guiding the coil in a cutting position for severing the thread predetermined or calculated at a first coil. Method according to one of Claims 1 to 4 , characterized in that a run-up time (T _H ) for actuating an auxiliary device for cutting the wound on the coil thread or measured at a first coil. Method according to one of Claims 1 to 5 Characterized in that the finished wound coil, an actual length of thread _(L) is assigned, which consists of a total winding time (W), the diameter of the galette (d) and the speed (n) of the Galettenantriebes according to the formula _L = W · Π · d · n is calculated. Method according to Claim 6 , characterized in that the actual yarn length of the wound bobbin is corrected with a length of thread to be traversed between the godet and the cutter by the yarn. Method according to Claim 6 , characterized in that the total winding time (W) results from the sum of the running time (T), the waiting time (T _W ) and the run-up time (T _H ). Method according to one of Claims 1 to 8th , characterized in that the yarn is swirled before casserole on the godet by means of a compressed air, wherein on the yarn, a yarn tension is adjusted by an upstream in the yarn course godet unit. Method according to Claim 9 , characterized in that between the godet units a yarn tension is measured and that the godet unit upstream in the yarn path is controlled to maintain a predetermined yarn tension in the peripheral speed. Method according to one of the preceding claims, characterized in that the thread is stretched before vortexing in one or more stages.

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