TW201814095A - Method and device for cooling a synthetic yarn - Google Patents

Abstract

The invention relates to a method and to a cooling device for cooling a synthetic yarn within a texturizing zone of a texturizing machine. To this end, a cooling liquid is introduced into a cooling groove of a cooling body, said cooling liquid being distributed in the groove base of the cooling groove. The heated yarn is guided in a contacting manner through the cooling groove. In order for an excess of cooling liquid to be avoided at the end of cooling, the cooling liquid, depending on a yarn count of the yarn, is supplied through a metering opening in the groove base of the cooling grove at a conveying rate in the range from 0.05 ml/min to 5 ml/min, wherein the conveying rate of cooling liquid is generated by a controllable metering means.

Description

Method and apparatus for cooling synthetic yarns

The present invention relates to a method for cooling a synthetic yarn as described in the foregoing claim 1, and to a cooling device for carrying out the method as previously described in claim 6.

In order to process spun into synthetic yarns, methods for crimping multifilament yarns have been used for decades, and are also known in the industry as so-called false-twist texturizing. For this purpose, a partially aligned yarn previously made by a melt-spinning process is crimped in a texturizing zone of the weaving machine. Here, the false twist is mechanically produced on the yarn, and the reproduction of the false twist is opposite to the running direction of the yarn. The yarn in this twisted state is heated to a temperature in the range of 200 °C. The plastic state obtained by the yarn material here causes the individual filaments of the yarn to be pressed into the yarn. To set the yarn structure, the yarn is then immediately cooled to a temperature of about 80 °C. Thereby retaining the curl in the yarn to achieve the desired processing. Preferably, the yarn is guided in a contact manner on its surface with an air-cooled cooling track to effect cooling of the yarn therein. However, this type of cooling track basically has the disadvantage that a relatively long cooling section is required in order to achieve proper cooling of the yarn. Accordingly, with regard to performing cooling of the yarn with a cooling liquid, several methods and apparatus are known in the prior art to enable the shortest possible cooling section.

A generic method and a generic device are known, for example, from the European Patent No. EP 0 403 098 A2. With regard to known methods and known devices for cooling synthetic yarns, the cooling body is provided with a cooling bath having a plurality of depressed groove pockets at the bottom of the groove. The cooling tank is coupled to the cooling liquid reservoir by a capillary tube to continuously introduce the cooling liquid to the cooling tank. The hot yarn is guided in contact through the cooling bath and cooled with a cooling liquid. The yarn is then directed past the downstream cooling track.

With regard to known methods and known devices, the cooling body forms a relatively short cooling section in which excess cooling liquid at the end of the cooling body is collected and returned to the water tank. The recycling of the cooling liquid results in significant additional complexity in view of the fact that hundreds of weaving zones are operated side by side in parallel in conventional weaving machines.

In order to minimize the excess of the cooling liquid during the cooling of the yarn, a method for cooling the synthetic yarn in the weaving zone is known from the patent, in which the cooling liquid is supplied to the yarn by means of a metering pump, wherein The adjustment of the metering pump depends on the application of the liquid being monitored on the yarn. After cooling, the liquid is applied to a portion of the yarn by a resistor to the application of the yarn there. Although a relatively large amount of excess cooling liquid can be surely avoided, the disadvantage is that a state in which the yarn is insufficiently cooled may occur due to insufficient cooling liquid. These states directly lead to deterioration of the curl uniformity.

In this case, it is an object of the present invention to provide a generic method and a generic cooling device for cooling synthetic yarns in a weaving zone of a weaving machine, each of which can be used to uniformly cool the yarn without the aid of the method and the apparatus. Any substantial excess cooling liquid.

Another object of the present invention is to improve a generic method and a generic cooling device for cooling synthetic yarns in this manner, particularly capable of cooling a plurality of yarns in parallel under the same conditions.

This object is achieved by a method for cooling synthetic yarns, as previously described in claim 1, and a cooling device for carrying out the method, as previously described in claim 6.

Advantageous refinements of the invention are defined by the features and combinations of features of the various sub-items.

The invention is based on the concept that there must be a specific correlation between the amount of cooling liquid and the quality of the yarn in order to obtain the desired cooling effect on the one hand and to minimize any excess of the cooling liquid at the end of the cooling, on the other hand. Here, it is ensured that the cooling liquid is supplied to the yarn in a reliable manner. The method of the invention thus provides a yarn count depending on the yarn to supply the cooling liquid to the tank of the cooling tank through a metering opening at a feed rate of between 0.05 ml/min and 5 ml/min. In the bottom. Depending on the yarn count of the yarn, it is possible to achieve the desired cooling and without any relatively large excess of cooling liquid after cooling.

Due to the relatively strong evaporation of the cooling liquid after the first contact of the cooling liquid with the hot yarn, the wetting of the yarn to be cooled takes place in the cooling section on the bottom of the trough of the cooling bath. For this purpose, according to an advantageous development of the invention, the guiding yarn passes over a cooling section having a section length of between 100 mm and 300 mm. Therefore, uniform wetting and cooling of the yarn is possible.

Herein is a variant of the method for distributing the cooling liquid in a plurality of successive pockets in the cooling trough in the cooling trough, wherein the yarn is guided in a contact manner across a plurality of pockets assembled between the pockets The web has proven to be particularly successful. Therefore, the cooling effect on the yarn can be enhanced even so that a relatively short cooling section can be realized.

In order to maintain a predetermined yarn guide and at the same time to uniformly contact the yarn of the cooling bath in the weaving zone, a method variant for guiding the yarn through a plurality of yarn guides arranged upstream and downstream of the cooling bath, Among them, the cooling groove has a groove bottom which is curved in the yarn running direction between the yarn guides, which is particularly advantageous. In particular, the angle of the yarn entering the cooling channel and the angle of being guided away from the cooling channel can thus be set in a particularly precise and reproducible manner. No individual adjustment is required in the machine or weaving zone due to the yarn guide.

In order to keep the environment as free of vapor as possible, the process of the invention is provided with respect to the improvement in collecting and pumping vapors produced by the wetting yarns in the cooling bath. It is particularly advantageous to collect and discharge vapor in view of the numerous yarns being processed side by side in parallel within the weaving machine.

The vacuum connector of the suction facility can be assembled in a particularly advantageous manner at the low point of the cooling zone at the outlet zone so that, in addition to the vapour, the unconsumed residue of the cooling liquid is also discharged.

In order to carry out the method, the cooling device of the invention has a metering device for supplying a cooling liquid, wherein the metering device has a metering member for producing a cooling liquid delivery rate of between 0.05 ml/min and 5 ml/min. Such a feed member is preferably realized by a metering pump which produces a continuous uniform flow of cooling liquid and can be supplied to the cooling bath.

The application of the cooling liquid to the yarn passing through the specific cooling section in the cooling bath is performed. For this purpose, the cooling grooves on the cooling body are constructed to have a length of between 100 mm and 300 mm.

In order to enhance the cooling effect, the cooling slots provided in the bottom of the tank have a plurality of recessed pockets which are each separated from each other by a guiding web in the bottom of the tank.

Here, the guiding web between the pockets on the bottom of the cooling trough can be constructed to have a web width of the same size and/or a web width of different sizes for the yarn to be in the cooling bath. Yarn guiding and wetting.

In order to be able to guide the yarn in a reproducible manner, a particularly advantageous development of the device according to the invention relates to a uniform contact in the bottom of the cooling trough, at least one yarn guide being arranged upstream of the cooling trough and a yarn guide being arranged Downstream, and with respect to the groove in the cooling groove which is curved in the running direction of the yarn.

In order to collect and discharge the vapour, an improvement is provided with respect to the device of the invention in which the cooling body is provided with a suction device on the cooling trough. Preferably, the suction facility is configured to remove, in addition to the vapor, fluid residues from the cooling bath that may form in the outlet zone. Therefore, the environmental pressure of the weaving machine can be avoided.

The method of the present invention for cooling synthetic yarns in the weaving zone of a weaving machine will be explained in more detail below with reference to the accompanying drawings by several exemplary embodiments of the apparatus of the present invention.

Figure 1 shows schematically a section of a weaving machine, in particular a weaving zone. For this purpose, the weaving machine has a supply package location 4, in which a supply package 2 of yarns 3 is held. Yarn 3 was previously produced as a partially aligned yarn (POY) by a melt spinning process. The first transfer unit 1.1 is assigned to the feed package position 4. In this exemplary embodiment, the transfer unit 1.1 is formed from a godet unit having a plurality of cladding materials. The first transfer unit 1.1 forms a yarn run-in into the so-called woven zone extending up to the second transfer unit 1.2. The second transfer unit 1.2 is also formed by a guide roller unit having a plurality of cladding materials. Here, the guide roller units of the transfer units 1.1 and 1.2 are exemplified. In principle, in the case of guiding the yarn with the gap between the driven shaft and the contact roller and/or the contact belt, a so-called splicing transfer unit for guiding the yarn can also be used.

The heating device 5, the cooling device 6 and the false twisting device 7 are arranged in the yarn running direction in a weaving zone extending between the conveying units 1.1 and 1.2. The cooling device 6 is formed by the apparatus of the present invention and is illustrated in detail in Figures 2 and 3.

Exemplary embodiments of the cooling device 6 of the present invention illustrated in Figures 2 and 3 are schematically illustrated in Figure 2 in a longitudinal cross-sectional view, and Figure 3 is illustrated in cross-section. The following description applies to both figures as long as no one of these figures is explicitly referenced.

An exemplary embodiment of the cooling device 6 of the present invention has an elongated heat sink 10. The cooling groove 11 extends on the upper surface of the cooling body 10. The cooling channel 11 extends up to the end face of the heat sink 10, wherein the inlet channel guide 8 is arranged in the yarn inlet channel 24 and the outlet yarn guide 9 of the cooling channel 11 is arranged on the yarn outlet 25. The cooling groove 11 has an arcuate groove bottom 17 whose curvature is represented by a radius R. The cooling section extending between the yarn inlet passage 24 and the yarn outlet passage 25 on the groove bottom 17 is indicated by the section length L in FIG.

The metering opening 12 of the groove bottom 17 of the cooling bath 11 opens in the region of the yarn inlet channel 24. The metering opening 12 is connected to the metering device 13 by means of a metering conduit 12.1 and a supply line 26. In this exemplary embodiment, the metering facility 13 has a metering member 14 that is coupled to the container 20. The cooling liquid is stored in the container 20. The dosing means 14 is preferably constructed as a metering pump and driven by a motor 15. The motor 15 is controlled by a controller 16 that is coupled to a machine control unit (not shown).

The groove bottom 17 of the cooling trough 11 extending in a portion between the metering opening 12 and the yarn outlet passage 25 has a plurality of recessed grooves separated from each other by a plurality of guide webs 19 in the groove bottom 17. Bag 18.

In particular, it can be seen from the illustration of Figure 3 that the pockets 18 of the trough bottom 17 form a depression that forms the accumulation of cooling liquid. The yarn 3 is guided in a contact manner on the surface of the guiding web 19.

As can be seen from the illustrations of FIGS. 2 and 3, the suction device 21 is disposed above the cooling tank 11. The suction device 21 has a suction sleeve 23 that extends over the entire length and width of the cooling tank 11 over the cooling body 10. The suction sleeve 23 is connected to the vacuum source 22 whereby the vapor generated by the cooling liquid as the yarn cools can be collected and discharged. A vacuum source 22 that can be constructed as a blower can advantageously operate a plurality of adjacent suction jackets 23.

At this point it should be apparent that this is an exemplary embodiment of the structure of the cooling device of the present invention. Therefore, the suction device 21 can also be arranged below the cooling channel in order to be able to additionally collect and discharge the liquid residue at the exit of the yarn.

As can be seen from the illustration of Fig. 1, in order to weave the yarn with the false twisting device 7, mechanically a weir is generated on the yarn, whereby the filament of the yarn 3 is twisted. This twist is reversed in the opposite direction of the yarn running direction and the inlet passage, usually in the weaving zone, is blocked by a so-called twist stop. Therefore, the twisted yarn 3 in the heating device 5 is heated to a temperature of about 200 °C. In order to cool the hot yarn to set the curl, the yarn 3 is fed to the cooling device 6 by the inlet passage guide 8. In order to cool the twisted yarn, the metering member 13 produces a cooling liquid having a predetermined delivery rate which is continuously introduced into the cooling bath 11 by the nozzle opening 12. Here, the transport rate is set between 0.05 ml/min and 5 ml/min whereby the proper cooling of the yarn is established on the one hand, and on the other hand, there is no substantial excess of cooling liquid after the yarn leaves the cooling bath 11. . With the twisted state of the yarn 3, the take-up of the liquid for cooling is prevented, so that the cooling groove is formed to a specific section length of between 100 mm and 300 mm depending on the yarn count.

In the test using a polyester yarn having a yarn count of 300 den, the yarn was appropriately cooled in a cooling section of 225 mm. Water is used as the cooling liquid, wherein depending on the requirements, water may be added with a small amount of oil, for example 1%. The amount of cooling liquid is about 4 ml/min.

It has been determined that the twisted yarn can be cooled more efficiently by using a cooling liquid in an amount between 5 and 15% by weight of the yarn. Therefore, the liquid residue at the end of the cooling process can be minimized. Thus, the process of the invention and the apparatus of the invention are particularly outstanding because of the proper cooling of the yarn with a minimum of cooling liquid in the weaving process. No complicated liquid residue collection and preparation is required.

Furthermore, it is possible to pre-set the yarn guides for the yarn guides 8 and 9 on the yarn inlet passage 24 of the cooling device 6 and on the yarn outlet passage 25 to enable reproducible and identical construction in parallel machining positions. Yarn guiding. As a result, they can eliminate the complicated setting operations in the weaving machine and the weaving area.

In the exemplary embodiment illustrated in Figure 2, the trough bottom 17 of the cooling trough 11 is assembled in the cooling body 10 to have a uniform trough pocket 18 such that the guiding webs 19 between the troughs have the same dimensions. The width of the web. In principle, however, it is also possible for the width of the web guiding the web 19 in the groove bottom 17 to be of different lengths. To this end, Figure 4 illustrates the situation in which an exemplary embodiment of the cooling apparatus of the present invention is constructed as a guide web 19 having a different web width. The exemplary embodiment of Figure 4 itself is otherwise identical to the exemplary embodiment of Figure 2 itself, wherein the suction facility 21 and metering facility 13 are not shown here. In the exemplary embodiment of FIG. 4 itself, the guide web 19 in the outlet passage region is constructed to be substantially wider than the remainder of the cooling channel 11. The supply of the cooling liquid to the yarn can be enhanced by the groove 18 of the groove bottom 17 of the cooling tank 11, whereby a relatively short cooling section and thus a relatively short cooling tank 11 can be realized on the cooling body 10. However, it is also possible to construct the cooling groove 11 without the bag.

Figure 5 illustrates an exemplary embodiment of the cooling apparatus of the present invention in the case where the cooling trough 11 of the trough bottom 17 has no trough pockets 18. The illustration of the suction facility 21 and the metering facility 13 is also omitted here. In this case, the yarn 3 is guided in a discontinuous contact manner on the groove bottom 17 of the cooling bath 11. Here, the cooling liquid introduced into the cooling bath 11 by the metering opening 12 is evenly distributed on the groove wall of the cooling tank 11, and is evaporated to the yarn outlet passage 25 or absorbed and carried away by the yarn.

In an exemplary embodiment of the apparatus of the invention illustrated in Figure 5, the metering conduit 12.1 is introduced into the cooling channel 11 at a slope to the direction of travel of the yarn. The conveying flow of the cooling liquid thus has aligned the yarn running direction, which contributes to the distribution in the cooling tank 11.

1.1‧‧‧First transmission unit

1.2‧‧‧Second transmission unit

2‧‧‧Feed packaging

3‧‧‧Yarn

4‧‧‧Feed packaging location

5‧‧‧ heating device

6‧‧‧Cooling device

7‧‧‧false equipment

8‧‧‧Import channel guide

9‧‧‧Export yarn guide

10‧‧‧Long heat sink

11‧‧‧Cooling trough

12‧‧‧Measuring opening/nozzle opening

12.1‧‧Measurement catheter

13‧‧‧Measuring facilities

14‧‧‧Measuring member/feeding member

15‧‧‧Motor

16‧‧‧ Controller

17‧‧‧ curved bottom

18‧‧‧ recessed pocket

19‧‧‧Guiding web

20‧‧‧ container

21‧‧‧sucking facilities

22‧‧‧vacuum source

23‧‧‧ suction casing

24‧‧‧Yarn import channel

25‧‧‧Yarn exit channel

26‧‧‧Supply pipeline

L‧‧‧ section length

R‧‧‧ Radius

In the drawings: Figure 1 is a schematic view of a weaving zone of a weaving machine having an integrated cooling device for cooling yarns of the present invention; Figure 2 is a schematic illustration of an exemplary embodiment of a cooling device of the present invention for cooling the yarn of Figure 1 Figure 3 is a schematic cross-sectional view of an exemplary embodiment of Figure 2; Figure 4 is a schematic cross-sectional view of another exemplary embodiment of the cooling device of the present invention; Figure 5 is a schematic view of another embodiment of the cooling device of the present invention A cross-sectional view of an exemplary embodiment.

Claims (11)

A method for cooling a synthetic yarn in a weaving zone of a weaving machine, the method comprising: directing a cooling liquid into a cooling tank of a cooling body, the method comprising: distributing the cooling liquid to the cooling tank In the bottom of the tank, and the method comprises: guiding the hot yarn through the cooling tank in a contact manner, characterized by: depending on the yarn count of the yarn, between 0.05 ml/min and 5 ml/min At a delivery rate, the cooling liquid is supplied through a metering opening into the bottom of the trough. The method of claim 1, wherein: the yarn in a cooling section on the bottom of the trough of the cooling trough is guided by a length of the section between 100 mm and 300 mm. The method of claim 1 or 2, wherein: the cooling liquid is distributed in the cooling tank across a plurality of successive tanks in the bottom of the tank, wherein the yarn is guided in a contact manner over the assembly a plurality of webs between the bags. The method of any one of claims 1 to 3, wherein: the yarn is guided through a plurality of yarn guides disposed upstream and downstream of the cooling bath, wherein the cooling tank is between the yarn guides There is a groove bottom which is curved in the running direction of the yarn. The method of any one of claims 1 to 4, wherein: the vapor generated by the wetting yarn is collected and pumped in the cooling bath. A cooling device for carrying out the method of any one of claims 1 to 5, having a cooling body for guiding an elongated cooling groove of the yarn, wherein the cooling groove is used in the groove A metering opening in the bottom is connected to a metering facility for supplying a cooling liquid, characterized in that: the metering facility has a controllable metering member for generating a cooling between 0.05 ml/min and 5 ml/min. Liquid delivery rate. A cooling device according to claim 6, wherein: the cooling bath has a length of between 100 mm and 300 mm on the cooling body. A cooling device according to claim 6 or 7, wherein: the cooling trough has a plurality of recessed trough pockets in the bottom of the trough which are each separated from each other by a guiding web. The cooling device of claim 8, wherein: the guiding webs between the trough bags on the bottom of the trough are constructed to have a web width of the same size and/or a web width of a different size. The cooling device according to any one of claims 6 to 9, wherein: the at least one yarn guide is disposed upstream of the cooling bath, and a yarn guide is disposed downstream, and wherein the cooling groove has the yarn A groove bottom with an arc in the running direction. A cooling device according to any one of claims 6 to 10, wherein: the cooling body is provided with a suction device for collecting and discharging steam on the cooling tank.