EP3312322A1 - Device for cooling a heated thread - Google Patents

Abstract

An apparatus for cooling a heated yarn with a heat sink is described. The heat sink has an elongated cooling groove for guiding the thread, which is connected via a metering opening in the groove base with a metering device for supplying a cooling liquid. In order to cool the thread with small cooling liquids without a coolant excess, the cooling groove according to the invention has a plurality of guide sections with a corrugated groove base and at least one guide section with a smooth groove base, which are formed alternately one behind the other. The metering opening is arranged in an inlet region of the cooling groove one of the guide sections with grooved groove bottom.

Description

The invention relates to a device for cooling a heated thread according to the preamble of claim 1.

In the production of synthetic threads it is known
in that the smooth threads produced after melt-spinning receive a crimp in a texturing process. For this purpose, a false twist is generated on the threads within a so-called texturing zone, which is fixed by thermal treatment in the filaments of the thread. Thus, it is customary to first heat the synthetic thread in the texturing zone to a temperature in the range of 200 ° C. The thereby achieved plastic state of the thread material causes the swirl memorizes in the individual filaments of the thread. To fix this thread structure, the thread is then immediately cooled to a temperature of about 80 ° C. The cooling of the thread is preferably carried out by an air-cooled cooling rail, on whose surface the thread is guided with contact. However, such cooling rails basically have the disadvantage that relatively long cooling distances are required to obtain a sufficient cooling of the thread. In addition, a thread guide is required to avoid strong friction that prevents premature wear of the cooling rail with the least possible wraps.

In the prior art, however, other devices for cooling a heated yarn are known in which the cooling of the yarn is carried out with the aid of a cooling liquid to the shortest possible cooling sections to be able to realize. The invention is based on such a state of the art.

A generic device is for example in the EP 0 403 098 A2 described. In the known apparatus for cooling a heated thread, a cooling body is provided with a cooling groove having a plurality of recessed Nuttaschen in the groove bottom of the cooling groove. The cooling groove is coupled via a capillary with a coolant reservoir, so that a cooling liquid is kept continuously in the cooling groove. The heated thread is guided by contact through the cooling groove and cooled by the cooling liquid. Subsequently, the thread is passed over a subsequent cooling rail.

In the known device, the heat sink forms a relatively short cooling section, wherein the excess cooling liquid is collected at the end of the heat sink and returned to a tank. In texturing machines, which consist of a plurality of such devices for cooling a heated thread, therefore facilities for collecting and processing the coolant liquid losses are required. In particular, taking into account the requirements for environmental protection, such devices for cooling heated threads have not been able to prevail. The preparation of the excess coolant is associated with a high expenditure on equipment.

It is an object of the invention to develop a generic device for cooling a heated thread such that the thread with a minimum amount of cooling liquid is sufficiently coolable.

In that regard, it is also an object of the invention to improve the generic device for cooling a heated yarn such that the smallest possible amounts of excess coolant liquid occur.

This object is achieved with a device for cooling a heated yarn in that the cooling groove has a plurality of guide portions with a grooved groove bottom and at least one guide portion with a smooth groove bottom, which are formed alternately one behind the other and that the metering one of the guide portions with grooved groove bottom in one Inlet region of the cooling groove is arranged upstream.

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

The invention has recognized that a corrugated groove bottom of the cooling groove considerably intensifies the wetting of the thread in the inlet region of the cooling groove. Thus, a continuous looping of the yarn supplied to the cooling liquid is prevented by the corrugation in the groove bottom. On the other hand, the corrugation in the groove base is suitable for stripping the adhering to the thread unevaporated coolant liquid residues and to keep in the cooling groove. Thus, the thread can be evenly wetted over a longer distance, so that the generated cooling effects are intensified. To be able to fully utilize these effects for cooling the thread, at least one guide section with a smooth groove base is provided, in which the thread is cooled by the previously supplied cooling liquid.

The different guide sections of the cooling groove therefore favor intensive cooling with minimal supply of cooling liquid.

The cooling effect within the cooling groove can be further improved by the guide section with the smooth groove bottom has a larger groove depth, as the guide sections with the corrugated groove bottom. This allows the thread to be guided through the cooling groove with and without contact. In the guide section with a smooth groove bottom, the thread receives no contact, so that only the cooling liquid acts to cool the thread.

So that the thread receives a secure guidance within the cooling groove, the corrugated groove bottoms of the guide sections are each formed by a plurality of recessed groove pockets and a plurality of a plurality of guide webs lying between the nut pockets. The thread can thus pass through the cooling groove with contact on the guide webs.

The length of the cooling groove is generally selected depending on the respective thread to be cooled and its yarn denier. For example, threads with relatively large thread ends require relatively long cooling grooves. In order to obtain the effective cooling effect according to the invention for each thread type, the development of the invention is preferably carried out, in which the guide sections each have a longitudinal section of the cooling groove in the range from 10 mm to 60 mm.

Thus, it is customary to incorporate with large yarn tents and correspondingly long cooling grooves, several of the guide sections with a smooth groove bottom. The guide sections close with the smooth groove base respectively always one of the guide portions with the corrugated groove bottom, so that a constant change between a contact zone and a non-contact zone prevails in the cooling groove.

So that the yarn is securely guided in the groove base of the cooling groove even with larger lengths of the cooling groove, it is further provided to arrange the guide sections of the cooling groove in such a way that the groove bases in the thread running direction have a guide curvature with a radius in a range of 300 mm to 1000 mm , In particular, in a texturing machine thus stronger thread deflections can be achieved without additional increase in wear.

The guide sections of the cooling groove can basically be formed in a one-piece heat sink. For the preparation of such cooling grooves, however, the development of the invention is preferably carried out, in which the guide portions of the cooling groove are formed by a plurality of successively arranged segments of the heat sink, which are held by a carrier. The composite segments thus provide the heat sink with the cooling groove required for the thread guide.

In this case, the development of the invention has proven particularly useful, in which the segments of the heat sink are formed with the guide portion with grooved groove bottom and the segments of the heat sink with the guide portion with smooth groove bottom of different materials. Thus, the segments that are required for the thread contact in the cooling groove, run with appropriate wear-resistant materials.

So that the immediate machine environment remains unloaded, the inventive development of the invention is particularly advantageous in which the heat sink is disposed within a housing between a yarn inlet and a yarn outlet and formed in the region of the yarn outlet a suction opening on the housing, which is connectable to a suction device , This prevents any vapors from entering the environment when the thread cools.

In order to dissipate any remaining cooling liquid together with the vapors, it is further provided to form the suction opening in a housing bottom between the heat sink and the yarn outlet. Thus, the suction flow can be advantageously used to suck a freely guided thread section before exiting the housing.

To be able to integrate the device for cooling the thread as flexibly as possible in a machine frame or in a threadline, the development of the invention is preferably carried out in which the thread inlet of the housing is assigned an inlet yarn guide and the yarn outlet of the housing an outlet yarn. Thus, a reproducible thread guide can be set advantageously. A special orientation of the heat sink within a textile machine is not required.

The device according to the invention is therefore particularly suitable for use in texturing machines with a large number of processing stations. Every processing point is an equal treatment and thus a uniform cooling by the device according to the invention executable.

The device according to the invention for cooling a heated thread is explained in more detail below with reference to several embodiments with reference to the accompanying figures.

• Figur 1 schematisch eine Längsschnittansicht eines ersten Ausführungsbeispiels der erfindungsgemäßen Vorrichtung
• Figur 2.1 und Figur 2.2 schematisch mehrere Querschnittsansichten des Ausführungsbeispiels aus Figur 1
• Figur 3 schematisch eine Längsschnittansicht eines weiteren Ausführungsbeispiels der erfindungsgemäßen Vorrichtung

They show:

• FIG. 1 schematically a longitudinal sectional view of a first embodiment of the device according to the invention
• Figure 2.1 and Figure 2.2 schematically a plurality of cross-sectional views of the embodiment FIG. 1
• FIG. 3 schematically a longitudinal sectional view of another embodiment of the device according to the invention

In the FIGS. 1 . 2.1 and 2.2 a first embodiment of the inventive device for cooling a heated yarn is shown schematically in several views. FIG. 1 shows the embodiment in a longitudinal sectional view and the Figures 2.1 and 2.2 Two cross-sectional views of the embodiment are shown. Unless an explicit reference is made to one of the figures, the following description applies to both figures.

The exemplary embodiment has an elongated heat sink 1. The cooling groove 2 extends up to the front ends of the heat sink 1. The cooling groove 2 thus forms a thread inlet 7 at the front ends and a thread outlet 8 at the opposite ends.

In order to guide a thread between the thread inlet 7 and the thread outlet 8 within the cooling groove 2, the cooling groove 2 has a plurality of guide sections 6.1 with a corrugated groove base 4.1 and a plurality of guide sections 6.2 with a smooth groove base 4.2. The guide sections 6.1 and 6.2 are formed alternately in the direction of yarn travel in the cooling groove 2.

The thread inlet 7 is assigned a first guide section 6.1 with the corrugated groove bottom 4.1. The ribbed groove bottom 4.1 of the first guide section 6.1 is preceded by a one-start region 20, in which a metering opening 3 opens. The metering opening 3 is connected via a metering channel within the heat sink 1 with a fluid line 5.1. The fluid line 5.1 is coupled to a metering device 5, which has a dosing 5.2 and a container 5.3. The dosing 5.2 is preferably designed as a metering pump, wherein in the container 5.3 a cooling liquid is kept.

As in the presentation FIG. 1 and FIGS. 2.1 and 2.2 As can be seen, the guide sections 6.1 and 6.2 have different groove depths in their respective groove base 4.1 and 4.2.

The Figure 2.1 shows a cross section of a guide section 6.1 with the corrugated groove bottom 4.1. The corrugated groove bottom 4.1 is formed by a plurality of recessed nutt pockets 9 and a plurality of guide webs 10, which protrude between the Nuttaschen 9. The guide webs 10 have a groove depth, which is identified by the reference numeral. The Nuttaschen 9 are recessed formed in the heat sink 1 and have a larger groove depth, which is denoted by the reference numeral t ₃ in Figure 2.1 is marked. The guide webs 10 are designed with a web width that is only a few millimeters. Likewise, the Nuttaschen have a small width of a few millimeters.

In Figure 2.2 is a cross-sectional view of a guide section 6.2 shown with the smooth groove bottom 4.2. The smooth groove bottom 4.2 has a groove depth, the in Figure 2.2 is designated by the reference symbol t ₂ . The groove depth t _{2 of} the smooth groove base 4.2 is made slightly larger than the groove depth t _{1 of} the corrugated groove base 4.1. Thus, t ₁ > t ₂

As from the illustration in FIG. 1 As can be seen, the guide sections 6.1 and 6.2 of the cooling groove 2 are arranged relative to one another such that the groove bases 4.1 and 4.2 form a guide curvature with a radius R in the thread running direction. Depending on the length of the cooling groove 2 or of the heat sink 1 and as a function of the filament titer, the radius R of the guide curvature is in the range of 300 mm to 1000 mm. Thus, a safe thread guide is achieved between the thread inlet 7 and the thread outlet 8. The thread is guided only in the guide sections 6.1 with the corrugated groove base 4.1 with contact. In the guide sections 6.2 with the smooth groove base 4.2, the thread is without contact guided. Thus arise within the cooling groove contact zones and non-contact zones in the thread guide.

In operation, a cooling liquid is metered in small quantities fed to the guide section 6.1 in the region of the thread inlet 7 via the metering device 5. Due to the running thread, the cooling liquid is partly absorbed directly and distributed over the corrugated structure of the groove base 4.1. This achieves a relatively long contact zone for wetting the thread. For this purpose, the guide section 6.1 has a longitudinal section L ₁ which, depending on the thread titer, has a range of 20 mm to 60 mm.

In the course of the cooling groove 2 follows a non-contact zone, in which the thread is guided in one of the guide sections 6.2 without contact. In this section, the applied liquid acts to cool the thread. The guide section 6.2 also has a longitudinal section of the cooling groove 2, which has an equal length depending on the thread titer. The length section is in FIG. 1 denoted by the reference L ₂ and is in the range of 10 mm to 60 mm.

In the course of the cooling groove 2 follows a contact zone with the corrugated groove bottom 4.1 and a non-contact zone with the smooth groove bottom 4.2 and another the thread outlet 8 associated guide section 6.1 with grooved groove bottom 4.1. The middle guide section 6.1 with the corrugated groove base 4.1, on the one hand, removes the excess cooling fluid from the thread and at the same time leads to a homogenization of the wetting in order to obtain further cooling. In the last management section 6.1 at the thread outlet 8, the thread is led out without substantially adhering excess coolant from the cooling groove 2.

Due to the alternating combination of fluted groove bases 4.1 and smooth groove bases 4.2, intensive cooling of the thread with minimal use of cooling liquid is achieved. An excess of cooling liquid can be advantageously avoided.

In order not to dispense the vapors occurring during cooling in the machine environment, the heat sink is usually encapsulated in a housing. This is in FIG. 3 a further embodiment of the inventive device for cooling a heated yarn in a longitudinal sectional view shown schematically. At the in FIG. 3 illustrated embodiment, the heat sink 1 is formed by a plurality of segments 11.1 to 11.7, each having a portion of the open cooling groove 2 on its upper side. The segments 11.1 to 11.7 are arranged one behind the other and held by a carrier 12. Each of the segments 11.1 to 11.7 here forms a guide section 6.1 with a corrugated groove base 4.1 or a guide section 6.2 with a smooth groove base 4.2. The guide sections 6.1 or 6.2 formed by the segments 11.1 to 11.7 are identical in their cross section to the exemplary embodiments according to FIG FIGS. 2.1 and 2.2 executed. In that regard, a thread is guided with contact on the segments 11.1, 11.3, 11.5 and 11.7. The segments 11.2, 11.4 and 11.6 have a smooth groove base 4.2, so that the thread is guided here without contact.

The heat sink 1 formed by the support 12 and the segments 11.1 to 11.7 is arranged inside a housing 13. The housing 13 surrounds the heat sink 1, wherein the heat sink 1 is disposed within the housing 13 between a yarn inlet 14 and a yarn outlet 15. In this embodiment, the yarn inlet 14 is formed by a yarn inlet yarn guide 14.1 and the yarn outlet 15 by the yarn outlet yarn guide 15.1. In principle, the thread guides 14.1 and 15.1 could be arranged independently of the thread inlet 14 and the thread outlet 15 in the interior of the housing 13 or else outside the housing 13.

In this embodiment, the inlet thread guide 14.1 and the outlet thread guide 15.1 are arranged at a short distance from the front ends of the heat sink 1. In this case, the guide grooves of the thread guides 14.1 and 9.1 cooperate with the groove bottom 4.1 of the cooling groove 2 for thread guidance.

In the region of the thread outlet 15, a suction opening 17 is formed inside the housing 13 in a housing bottom 16. The suction port 17 is disposed between the front end of the heat sink 1 and the Auslassfadenführer 15.1. The suction opening 17 is coupled via a suction line 18 with a suction device, not shown here.

On the opposite side in the inlet region, the housing 13 has an air opening 19. The air opening 19 is formed in the region between the inlet yarn guide 14.1 and the front end of the heat sink 1. The air opening 19 opens in an environment of the housing thirteenth

The supply of a cooling liquid is ensured by a metering device 5, which is arranged outside the housing. For this purpose, the metering device 5 has a metering means 5.2, for example a metering pump and a container 5.3, which is filled with a cooling liquid. The dosing 5.2 is connected via a fluid line 5.1 with the dosing 3.1 in the first segment 11.1 of the heat sink 1.

In operation, the metering device 5 conveys a predetermined amount of cooling liquid continuously via the metering opening 3 into the inlet region 20 of the cooling groove 2. For this purpose, the inlet region 20 is arranged in the first segment 11.1 upstream of the guide section 6.1. The inlet region 20 in the cooling groove 2 in this case has a substantially identical groove depth to the corrugated groove bottom 4.1.

To cool a heated thread, the thread is threaded into the housing 13 at the beginning of the process. The yarn is guided through the cooling groove 2 through the inlet yarn guide 14.1 and the exhaust yarn guide 15.1. The thread passes through the cooling groove 2 with contact with the corrugated groove bases 4.1 of the guide sections 6.1. In this embodiment, a total of four segments 11.1, 11.3, 11.5 and 11.7 are provided to guide the thread with contact in the cooling groove 2. In this case, the thread is wetted with the cooling liquid and cooled by evaporation of the cooling liquid. The resulting vapors accumulate in the housing 13 and are discharged through the suction port 17. In this case, a continuous stream of fresh air is introduced via the air opening 19 into the interior of the housing 13. It turns a uniform in the direction of yarn flow air flow a, which favors the removal of vapors above the cooling groove 2. In addition, the air flow is used on the yarn outlet side to suck on a freely guided thread section between the heat sink 1 and the Auslassfadenführer 15.1 loosely adhering residual cooling liquid from the thread. This makes it possible to avoid leakage of a residual liquid from the housing 1.

The device according to the invention for cooling a heated thread is particularly suitable for being used side by side in a texturing machine with a plurality of processing stations. Thus, a variety of such devices can be used in a texturing machine. Despite intensive cooling of the threads by the cooling liquid, no stresses on the environment occur in the texturing machine. Due to the very low amounts of residual liquid collecting and processing of the cooling liquid after cooling of the thread is not required.

In the embodiments shown, the number of different guide portions of the cooling groove is exemplary. For thread guidance, a guide section with a grooved groove bottom is required at least at the thread inlet and at the thread outlet of the cooling groove. The cooling groove would only have a single guide section with a smooth groove bottom in the middle area. The lengths of the different guide sections can be the same or different lengths.

Claims (11)

Device for cooling a heated thread with a cooling body (1), which has an elongated cooling groove (2) for guiding the thread, wherein the cooling groove (2) is connected to a metering device (5) via a metering opening (3) in the groove base (41, 4, 2) ) is connected to the supply of a cooling liquid, characterized in that the cooling groove (2) has a plurality of guide sections (6.1) with a corrugated groove bottom (4.1) and at least one guide section (6.2) with a smooth groove bottom (4.2), which are formed alternately one behind the other , and in that the metering opening (3) is arranged upstream of one of the guide sections (6.1) with grooved groove base (4.1) in an inlet region (20) of the cooling groove (2). Apparatus according to claim 1, characterized in that the guide section (6.2) with the smooth groove bottom (4.2) has a larger groove depth (t ₂ > t ₁ ) than the guide sections (6.1) with the corrugated groove bottom (4.1). Apparatus according to claim 1 or 2, characterized in that the corrugated groove bottoms (4.1) of the guide sections (6.1) are each formed by a plurality of recessed Nuttaschen (9) and a plurality of a plurality of Nuttaschen (9) lying guide webs (10) , Device according to one of claims 1 to 3, characterized in that the guide sections (6.1, 6.2) each have a longitudinal section of the cooling groove (2) in the range of 10 mm to 60 mm. Device according to one of claims 1 to 4, characterized in that the cooling groove (2) has a plurality of guide sections (6.2) with the smooth groove bottom (4.2), each including at least one of the guide sections (6.1) with the corrugated groove bottom (4.1) , Device according to one of claims 1 to 5, characterized in that the guide sections (6.1, 6.2) of the cooling groove (2) are arranged to each other such that the groove bottoms (4.1, 4.2) in the yarn running direction a guide curvature with a radius in the range of 300 mm up to 1000 mm. Device according to one of claims 1 to 6, characterized in that the guide sections (6.1, 6.2) of the cooling groove (2) by a plurality of successively arranged segments (11.1-11.7) of the heat sink (1) are formed by a support (12). are held. Apparatus according to claim 7, characterized in that the segments (11.1-11.7) of the heat sink (1) with the guide portion (6.1) with grooved groove bottom (4.1) and the segments (11.1-11.7) of the heat sink (1) with the guide portion ( 6.2) are formed with smooth groove bottom (4.2) of different materials. Device according to one of claims 1 to 8, characterized in that the cooling body (1) within a housing (13) between a yarn inlet (14) and a yarn outlet (15) is arranged and that in the region of the yarn outlet (15) has a suction opening ( 17) is formed on the housing (13), which is connectable to a suction device. Apparatus according to claim 9, characterized in that the suction opening (17) in a housing bottom (16) between the heat sink (1) and the yarn outlet (15) is formed. Apparatus according to claim 9 or 10, characterized in that the yarn inlet (14) of the housing (13) an inlet yarn guide (14.1) and the yarn outlet (15) of the housing (13) is associated with a Auslassfadenführer (15.1).

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