CN107964713B

CN107964713B - Cooling device for synthetic threads

Info

Publication number: CN107964713B
Application number: CN201710962163.1A
Authority: CN
Inventors: S·康拉德; P·容贝克; T·穆恩斯特曼; T·拉马克斯
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2016-10-19
Filing date: 2017-10-17
Publication date: 2021-11-19
Anticipated expiration: 2037-10-17
Also published as: EP3312321A1; JP2018080435A; TR201910165T4; CN107964713A; EP3312321B1; JP7033881B2

Abstract

The invention relates to a cooling device for synthetic threads, in particular twisted threads in a deformation region, comprising an elongate heat sink having an open cooling groove for guiding the threads. The cooling recess is connected via a metering opening to a metering device for supplying a cooling liquid. Due to the dynamics of the wire, in order to obtain a uniform wetting and intensive cooling, the heat sink comprises at least one ceramic insert at the wire inlet, which ceramic insert forms a corrugated groove bottom in the cooling groove and which wire can be guided in contact on the surface of the ceramic insert to which the metering opening is assigned. Thus, the cooling liquid can be continuously supplied to the wire over a longer distance.

Description

Cooling device for synthetic threads

Technical Field

The invention relates to a cooling device for synthetic threads, in particular twisted threads in a deformation region, comprising an elongate heat sink having an open cooling groove for guiding the threads, which cooling groove is connected via a metering opening in the groove bottom to a metering device for supplying a cooling liquid.

Background

In the production of synthetic threads, it is known to crimp the multifilaments produced in the melt spinning process in a downstream process for textile purposes. In this way, the synthetic threads are given a structure similar to natural fibers. The further processing of the synthetic threads takes place by means of a texturing machine which has a plurality of processing stations in order to crimp a respective thread at each processing station. The crimping of the threads, also known as "texturing", can be achieved by a so-called false twisting process. Here, a mechanical false twist is produced on the heat-treated threads in the so-called texturing zone. For the heat treatment, the twisted wire is heated to a temperature of about 200 ℃ and then cooled again. Since the false twist produced in the thread propagates counter to the direction of extension of the thread, it must be ensured that the twist produced on the thread passes through the cooling device and can enter the heating device as unhindered as possible. For this purpose, use is generally made of cooling devices formed as curved cooling tracks. Here, the largest possible radius of curvature is used on the cooling track in order to keep the contact friction between the twisted thread and the surface of the cooling device low. Such cooling tracks cool the wire with only ambient air. Such cooling devices therefore require relatively long cooling sections, which often leads to a multistage design of the texturing machine.

In the prior art, cooling devices are also known which intensify the cooling of the wire by means of the aid of a cooling liquid. A general cooling device is known, for example, from EP 0403098 a 2. Here, in the deformation zone, the twisted thread is guided through a cooling groove on the surface of a heat sink which stores a cooling liquid for wetting the thread in the bottom of the groove. Wetting of the wire facilitates the frictional behavior of the wire between the wire and the contact track, thereby facilitating twist transfer. However, because of the twisted structure, infiltration of cooling liquid into the twisted yarn is a problem. False twisting produces its own dynamic behavior and, in twisting, makes it more difficult for the cooling liquid to adhere, which is carried only by the filaments and is thrown off when the filaments leave the cooling groove. In particular, for larger thread counts, sufficient cooling cannot be achieved internally, so that in the known cooling devices the threads are subsequently guided on a cooling rail for residual cooling.

Disclosure of Invention

In this sense, the object of the invention is to improve the same cooling device in such a way that the most intensive cooling of the wire is achieved by applying a cooling liquid.

It is a further object of the invention to perform the wetting of the filaments with the lowest possible excess of residual cooling liquid.

According to the invention, this object is achieved in that the heat sink comprises at least one ceramic insert at the inlet of the wire, which ceramic insert forms a corrugated groove bottom in the cooling groove and the wire can be guided in contact over the surface of the ceramic insert to which the metering opening is assigned.

The invention has the particular advantage that the cooling liquid in the cooling groove is distributed over the wetting zone and is not carried away directly by the wire. Here, the wire is guided in contact on the ceramic insert forming the corrugated groove bottom in the cooling groove. Thus, the thread can be guided over a plurality of support points. Although the contact is strong, this limits the friction on the wire and does not hinder the twisting. The corrugation of the groove bottom filled with cooling liquid counteracts the strong evaporation of liquid on the thread (in particular the evaporation that starts to occur) and the liquid is continuously reapplied to the thread.

Thereby, the cooling liquid is preferably supplied in an inlet area of the groove bottom, which inlet area is arranged upstream of said corrugated groove bottom. Thus, the metering opening opens into the inlet area, which is spanned by the wire contact or preferably without contact. Thus, the cooling liquid can be continuously supplied in a metered manner into the cooling groove.

Since the wires guided in the deformation region exhibit high natural dynamics, in particular the wire outlet of the cooling device assigned to the subsequent deformation unit, in order to stabilize the guided wires, the improvement according to the invention is preferably implemented in that the heat sink comprises at least one further ceramic insert with a corrugated groove bottom at the wire outlet of the cooling groove, which cooling groove comprises at least one guide section with a smooth groove bottom between the ceramic inserts. Thus, the thread can be guided in the cooling groove at the thread outlet with sufficient contact with the thread, and high thread friction is not allowed to occur. Moreover, possible liquid residues on the wire can remain in the bottom of the groove. Thus avoiding dripping of liquid after leaving the cooling groove.

In order to be able to cool with the guide section between the ceramic inserts of the thread inlet and the thread outlet, provision is made for: the smooth groove bottom of the pilot portion has a greater groove depth than a ceramic insert having a corrugated groove bottom. Thus, wire contact is avoided and uniform cooling of the freely guided wire is achieved.

In order to allow in particular a metered wetting of the wires at the wire inlet depending on the wire count, the ceramic inserts each form a length portion of the cooling groove, which length portion is in the range of 10mm to 60mm depending on the wire count. Thus, a plurality of such ceramic inserts may be formed spaced apart from one another in the cooling groove.

Because of the corrugated groove base structure of the ceramic insert, a relatively large deflection of the wire in the deformation region can be achieved. The ceramic inserts are thus preferably arranged on the heat sink relative to one another such that the groove bottom has a guiding curvature in the running direction of the wires with a radius in the range from 300mm to 1000 mm. In this way, a very compact deformation region can be achieved in the deformation machine.

The structural design of the cooling grooves on the heat sink can also advantageously be realized in segments, so that the individual cooling groove portions are formed alternately by ceramic inserts or material inserts, which are held together on a support. The ceramic inserts form the guide portions of the cooling grooves for contactingly guiding the wires, while the material inserts each form a guide portion with a smooth groove bottom for contactlessly guiding the wires.

However, it is also possible here to form the material insert and the support as one piece.

In order to avoid the generation of water vapor and the pollution of the surrounding environment, the improvement of the invention is particularly advantageous, in which said heat sink is arranged inside the housing between the wire inlet and the wire outlet; and in the region of the thread outlet, a suction opening is formed in the housing which can be connected to a suction device.

In order to be able to carry away possible residual liquid in addition to water vapor, provision is made for: the suction opening is formed in the bottom of the housing between the heat sink and the wire outlet. Thus, a suction flow can be generated which is guided to the freely guided portion of the thread between the heat sink and the thread outlet.

The improvement according to the invention enables in particular improved guiding of the thread in the deformation region, wherein an inlet thread guide is assigned to the thread inlet of the housing and an outlet thread guide is assigned to the thread outlet of the housing. In this way, the entry angle of the wire into the cooling groove and the exit angle of the wire out of the cooling groove can be adjusted particularly precisely and reproducibly. Thus, no special alignment of the cooling device at the texturing machine is necessary.

Drawings

The cooling device for synthetic threads according to the invention will be described in more detail in the following by means of a number of exemplary embodiments with reference to the attached drawings, in which:

fig. 1 schematically shows a longitudinal section through a first exemplary embodiment of a cooling device.

Fig. 2.1 and 2.2 schematically show cross-sectional views of the exemplary embodiment of fig. 1.

Fig. 3 schematically shows a longitudinal section through another exemplary embodiment of a cooling device according to the present invention.

Fig. 4 schematically shows a longitudinal section through another exemplary embodiment of a cooling device according to the present invention.

Detailed Description

In fig. 1, 2.1 and 2.2, a first exemplary embodiment of a cooling device according to the invention is illustrated in several views. Fig. 1 schematically shows a longitudinal section through a cooling device according to the invention, and fig. 2.1 and 2.2 each show a cross-sectional view through a cooling device according to the invention. Without explicitly referring to any one of the figures, the following description pertains to that figure.

A first exemplary embodiment of a cooling device according to the present invention comprises an elongated heat sink 1. An open cooling groove 2 extends on the upper side of the heat sink 1. The cooling groove 2 extends between a wire inlet 7 and a wire outlet 8 formed at the end face of the heat sink 1. At the wire inlet 7, the ceramic insert 3.1 is held in the cooling groove 2 on the heat sink 1. The ceramic insert 3.1 is integrated in the cooling groove 2 and forms a corrugated groove bottom 4.1. An inlet region 7.1 is arranged upstream of the corrugated groove bottom 4.1, the inlet region 7.1 forming the wire inlet 7. The metering opening 5 opens into an inlet region 7.1 of the ceramic insert 3.1. The dosage opening 5 is connected to a metering device 6 via a metering channel 5.1, the metering channel 5.1 passing through the ceramic insert 3.1 and the heat sink 1.

The metering device 6 has a fluid line 6.1, a metering member 6.2 and a container 6.3. The cooling liquid is stored in a container 6.3, which is fed to the metering channel 5.1 via a metering means 6.2 (e.g. a metering pump) and a fluid line 6.1.

The ceramic insert 3.1 extends within the cooling groove 2 over a length section which is identified in fig. 1 by the reference symbol L. The ceramic insert 3.1 has a length portion in the range of 10mm to 60mm, depending on the wire count.

As is evident from the illustration in fig. 1, the wire outlet 8 is likewise assigned a ceramic insert 3.2. The ceramic insert 3.2 is integrated in the cooling groove 2 and forms a corrugated groove bottom 4.1. The design of the corrugated groove bottom 4.1 of the ceramic inserts 3.1 and 3.2 is substantially identical. To further illustrate the ceramic inserts 3.1 and 3.2, fig. 2.1 shows a cross-sectional view of the ceramic insert 3.1 in the region of the bottom of the corrugated groove.

As is revealed in the illustration of fig. 2.1, a ceramic insert 3.1 for forming the cooling device 2 is embedded in the heat sink 1. Here, the corrugated groove bottom 4.1 is formed by a plurality of recessed channels 9 and a plurality of raised webs 10. The web 10 has a width of preferably several millimeters. Here, the channel 9 and the web 10 may have the same or different widths.

The web 10 forms the groove bottom 4.1 and has the reference sign t in fig. 2.1₁The groove depth of the mark. In contrast, the channel 9 is realized with a greater groove depth, which is designated by reference sign t in fig. 2.1₃And (5) identifying.

As is evident from the illustration in fig. 1, the central region between the ceramic inserts 3.1 and 3.2The cooling groove 2 has a guide portion with a smooth groove bottom 4.2. Here, the groove depth of the smooth groove bottom 4.2 is designed to be greater than the groove depth of the corrugated groove bottom 4.1 on the ceramic inserts 3.1 and 3.2. In fig. 1 and 2.2, the groove depth of the smooth groove bottom 4.2 is marked by reference sign t₂And (4) showing. Only at the thread inlet 7 and the thread outlet 8 are the threads thus guided in contact on the corrugated groove bottom 4.1 of the cooling groove 2. In the central region, the wire is guided without contact over the smooth groove bottom 4.2 of the cooling groove 2.

During operation, cooling liquid is supplied to the cooling groove 2 via the metering device 6. The cooling liquid emerges via the metering opening 5 in the inlet region 7.1 on the ceramic insert 3.1. Here, the inlet region 7.1 can have the same or a greater groove depth relative to the corrugated groove bottom 4.1. The groove depth of the inlet region 7.1 is preferably chosen to be slightly greater than the groove depth of the corrugated groove bottom 4.1. The wire thus makes a first contact on the corrugated groove bottom 4.1 when it enters the cooling groove 2. The incoming cooling liquid is partly picked up by the moving wire and partly distributed over the corrugated groove bottom 4.1. In this connection, the length L of the ceramic insert 3.1 forms a wetting zone in which a cooling liquid is supplied to the moving wire.

In order to achieve a strong contact between the wire and the corrugated groove bottom 4.1, the ceramic inserts 3.1 and 3.2 are formed with a guiding curvature with a radius R in the running direction of the wire. For this purpose, the radius R is schematically drawn in fig. 1. The guiding curvature R for the guiding wire is typically in the range of 300mm to 1000 mm.

The wire is thus guided in contact only in the region of the ceramic inserts 3.1 and 3.2. In the central region, the wire is guided in the cooling channel 2 without contact, on which wire free evaporation can take place on all sides, so that intensive cooling is achieved.

In order to prevent the surroundings of the cooling device from being contaminated, the heat sink is preferably arranged within the housing. To this end, in fig. 3, a further exemplary embodiment of a cooling device is schematically illustrated in a longitudinal sectional view.

The exemplary embodiment according to fig. 3 has a multipart heat sink 1. In this exemplary embodiment, the heat sink 1 is formed by a support 12 with a plurality of ceramic inserts 3.1 and a plurality of material inserts 11.1, 11.2 and 11.3. The ceramic inserts 3.1 to 3.4 are held alternately with the material inserts 11.1 to 11.3 on the support 12 and form open cooling grooves 2 on their upper side. Thus, each insert 3.1 to 3.4 and 11.1 to 11.3 forms part of the cooling groove 2.

The ceramic insert 3.1 is designed identically to the exemplary embodiment described above, with an inlet region 7.1 and a corrugation in the groove bottom 4.1. All the remaining ceramic inserts 3.2, 3.3 and 3.4 have a corrugated groove bottom 4.1.

On the other hand, the material inserts 11.1, 11.2 and 11.3 in the cooling groove 2 form a smooth groove bottom 4.2. Here, the smooth groove bottom 4.2 is formed with a greater groove depth in the cooling groove 2, so that the wire is guided in contact only on the corrugated groove bottom 4.1.

The ceramic insert 3.1 is assigned a metering opening 5, the metering opening 5 being connected to a metering device 6 via a metering channel 5.1.

The heat sink 1 extends within the housing 13 between a wire inlet 14 and a wire outlet 15. Both the thread inlet 14 and the thread outlet 15 are formed at the end of the housing 13. In this exemplary embodiment, the thread inlet 14 is formed by an integrated inlet thread guide 14.1, while the thread outlet 15 is formed by an integrated outlet thread guide 15.1. The entry guide 14.1 and the exit guide 15.1 are preferably formed from ceramic and have guide grooves. In principle, the thread guides 14.1 and 15.1 can be arranged independently of the thread inlet 14 and the thread outlet 15 inside the housing 13 or outside the housing 13.

In this exemplary embodiment, the entrance thread guide 14.1 and the exit thread guide 15.1 are arranged at a short distance from the thread entrance 7 and the thread exit 8 of the cooling groove 2. In this case, the guide grooves of the thread guides 14.1 and 15.1 interact with the ceramic inserts 3.1 and 3.4 in the cooling groove 2 for thread guidance.

In the region of the thread outlet 15, a suction opening 17 is formed in the housing bottom 16 of the housing 13. The suction opening 17 is arranged between the end face of the heat sink 1 and the exit thread guide 15.1. The suction opening 17 is coupled to a suction device (not specifically shown here) via a suction line 18.

On the opposite side, in the inlet region, the housing 13 has air openings 19. An air opening 19 is formed in the region between the inlet thread guide 14.1 and the end face of the heat sink 1. The air opening 19 opens at the periphery of the housing 13.

The supply of cooling liquid is ensured by a metering device 6 arranged outside the housing 13. For this purpose, the metering device 6 has a metering means 6.2 (e.g. a metering pump) and a container 6.3 filled with cooling liquid. The metering component 6.2 is connected to the metering channel 5.1 of the heat sink via a fluid line 6.1.

During operation, the metering device 6 continuously delivers a predetermined quantity of cooling liquid to the heat sink 1, which is supplied via the metering opening 5 in the inlet region 7.1 of the cooling groove 2. In order to cool the hot wire, the synthetic wire (in particular the twisted wire during the deformation) is guided through the cooling groove 2. The wires run in contact over the surface of the ceramic inserts 3.1, 3.2, 3.3 and 3.4 through the cooling grooves 2. Here, the wetting of the wires takes place in the ceramic insert 3.1, in which ceramic insert 3.1 the liquid is distributed in the corrugated structure of the groove bottom 4.1.

The water vapor generated during the cooling of the threads is collected in the housing 13 and is drawn off via the suction opening 17. Here, a continuous flow of fresh air is admitted into the interior of the housing 13 via the air openings 19. A uniform air flow is thus established in the running direction of the wire, which promotes the removal of water vapour above the cooling grooves 2. Furthermore, on the filament outlet side, the residual cooling liquid which is still loosely adhering to the freely guided filament part between the heat sink 1 and the exit thread guide 15.1 is extracted from the filament using this air flow. Thus, the escape of residual liquid from the housing 13 is avoided.

In the exemplary embodiment shown in fig. 3, the heat sink comprises a multi-part structure with different inserts. The structural configuration of the heat sink 1 can also be realized in such a way that: the cooling groove portions formed by these inserts are connected to each other by a smooth groove bottom.

A further possible exemplary embodiment of the cooling device according to the invention is shown in fig. 4. The exemplary embodiment according to fig. 4 is substantially identical to the exemplary embodiment according to fig. 3, so that only the differences will be explained here.

In the exemplary embodiment shown in fig. 4, the heat sink 1 is formed by a support 12 and a plurality of ceramic inserts 3.1, 3.2, 3.3 and 3.4. For this purpose, the support 12 has a plurality of guide sections of the cooling grooves 2 arranged between the ceramic inserts 3.1 to 3.4. Thus, the smooth groove bottom 4.2 of the cooling groove 2 is combined with the support 12. The support 12 can be formed as a casting, for example made of plastic or metal, on which the ceramic inserts 3.1 to 3.4 are held.

In the exemplary embodiment shown in fig. 4, the housing 13 has a thread inlet 14 and a thread outlet 15 at its end faces, respectively. Here, the wires are guided directly to the heat sink 1 by the wire inlet 14 without a wire guide. Likewise, the outlet 15 of the thread on the mouth side is not assigned any exit thread guide. Here, the wire is guided directly by the ceramic insert 3.1 at the wire inlet 7 and by the ceramic insert 3.4 at the wire outlet 8.

The function related to the cooling wire is the same as in the exemplary embodiment according to fig. 3 and will therefore not be further explained here.

The cooling device according to the invention is particularly suitable for use in a texturing machine having a plurality of processing stations.

Claims

1. A cooling device for synthetic threads, comprising an elongated heat sink (1), which heat sink (1) has an open cooling groove (2) for guiding the threads, which cooling groove (2) is connected via a metering opening (5) in a groove bottom (4.1, 4.2) to a metering device (6) for supplying a cooling liquid,

characterized in that the heat sink (1) comprises at least one ceramic insert (3.1) at a wire inlet (7), the ceramic insert (3.1) forming a corrugated groove bottom (4.1) within the cooling groove (2) and the wires being guidable in contact over the surface of the ceramic insert (3.1), the metering opening (5) being assigned to the ceramic insert (3.1).

2. The cooling arrangement as claimed in claim 1, characterized in that the metering opening (5) is arranged upstream of the corrugated groove bottom (4.1) on the ceramic insert and opens into an inlet region (7.1) of the groove bottom (4.1) of the cooling groove (2).

3. A cooling arrangement according to claim 1 or 2, characterised in that the heat sink (1) comprises at least one further ceramic insert (3.2) with a corrugated groove bottom (4.1) at the wire outlet (8) of the cooling groove (2), the cooling groove (2) comprising at least one guide part with a smooth groove bottom (4.2) between the ceramic inserts (3.1, 3.2).

4. A cooling arrangement according to claim 3, characterised in that the leading part with a smooth groove bottom (4.2) has a larger groove depth than the ceramic insert (3.1, 3.2) with a corrugated groove bottom (4.1).

5. A cooling arrangement according to claim 1, characterised in that the ceramic inserts (3.1, 3.2) each form a length portion (L) of the cooling groove (2) in the range of 10mm to 60 mm.

6. A cooling arrangement according to claim 1, characterised in that the ceramic inserts (3.1, 3.2) are arranged on the heat sink (1) relative to each other such that the groove bottom (4.1) has a guiding curvature in the running direction of the wire with a radius (R) in the range of 300 to 1000 mm.

7. A cooling arrangement according to claim 3, characterised in that, in order to form the cooling groove (2), the heat sink (1) has a plurality of ceramic inserts (3.1, 3.2) and a plurality of material inserts (11.1-11.3), the ceramic inserts (3.1, 3.2) and the material inserts (11.1-11.3) each forming a groove portion of the cooling groove (2) and being alternately retained on a support (12), the material inserts (11.1-11.3) each forming the guide portion with a smooth groove bottom (4.2).

8. A cooling arrangement according to claim 7, characterised in that the material insert (11.1-11.3) and the support (12) are formed in one piece.

9. A cooling arrangement according to claim 1, characterised in that the heat sink (1) is arranged inside the housing (13) between the wire inlet (14) and the wire outlet (15); and in the region of the thread outlet (15), a suction opening (17) which can be connected to a suction device is formed on the housing (13).

10. A cooling device according to claim 9, characterised in that the suction opening (17) is formed in the housing bottom (16) between the heat sink (1) and the wire outlet (15).

11. A cooling device according to claim 9 or 10, characterized in that an inlet thread guide (14.1) is assigned to the thread inlet (14) of the housing (13) and an outlet thread guide (15.1) is assigned to the thread outlet (15) of the housing (13).

12. The cooling device of claim 1, wherein the synthetic thread is a twisted thread in the deformed region.