US20130174531A1 - Method and apparatus for spinning and crimping a synthetic multifilament yarn - Google Patents
Method and apparatus for spinning and crimping a synthetic multifilament yarn Download PDFInfo
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- US20130174531A1 US20130174531A1 US13/711,276 US201213711276A US2013174531A1 US 20130174531 A1 US20130174531 A1 US 20130174531A1 US 201213711276 A US201213711276 A US 201213711276A US 2013174531 A1 US2013174531 A1 US 2013174531A1
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- Prior art keywords
- cooling
- yarn
- plug
- yarn plug
- speed
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H7/00—Spinning or twisting arrangements
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/12—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes
- D02G1/122—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics using stuffer boxes introducing the filaments in the stuffer box by means of a fluid jet
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
- D02J13/005—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass by contact with at least one rotating roll
Definitions
- the invention relates to a method for spinning and crimping a synthetic multifilament yarn, as well as an apparatus for spinning and crimping a synthetic multifilament yarn.
- a plurality of strandlike filaments are extruded in a first step from a thermoplastic melt by means of a spin unit. After cooling, the filament bundle is combined and subsequently compressed to a yarn plug by means of a crimping device.
- the filaments of the filament bundle are deformed in the yarn plug to loops and coils by means of a preferably heated fluid.
- the crimping device includes a stuffer box chamber, in which the conveying medium compresses the filament bundle to the yarn plug.
- the yarn plug advances through a cooling zone.
- the cooling zone is formed by a cooling groove preferably on the circumference of a rotating cooling drum.
- the length of the cooling zone is defined by the diameter of the cooling drum and by a partial looping on the circumference of the cooling drum.
- the cooling drum is driven for rotation, so that the circumferential speed of the cooling groove equals the cooling speed of the yarn plug, at which the yarn plug advances through the cooling zone.
- U.S. Pat. No. 5,974,777 discloses a method and an apparatus for cooling a yarn plug, wherein the yarn plug advances with several loopings over the circumference of a cooling drum. While this procedure permits achieving longer dwelling times for cooling the yarn plug even at higher process speeds, it has the disadvantage that the combined yarn plugs interfere with one another on the circumference of the cooling drum, so that, for example, individual filaments of adjacent plugs interlock and lead to undesired filament breaks upon disentanglement of the plugs. In addition, it is necessary to displace the yarn plugs on the cooling drum surface, so that additional shearing forces act upon the plug. Furthermore, such a displacement on the circumference of the cooling drum may cause individual filaments to interlock on the cooling surface.
- the invention is based on the discovery that the dwelling time of the yarn plug within the cooling zone or in the cooling groove is the decisive parameter for cooling the yarn plug.
- further parameters for cooling the yarn plug are the temperature difference between the yarn plug and the cooling medium as well as the volume flow of the cooling medium.
- the influence of these parameters is small in proportion with the duration of the cooling. For example, in tests with a textured yarn of a polyamide PA6 it was possible to find that duplicating the time from 0.25 seconds to 0.5 seconds resulted in an improvement of the crimp of about 10%. A further duplication of the cooling period from 0.5 seconds to 1 second allowed to achieve a further improvement of the crimp of 4%. This asymptotic behavior between dwelling time and crimp applies to all types of polymers.
- the length of the cooling zone and the cooling speed of the yarn plug are decisive parameters for the cooling period of the yarn plug.
- the method of the invention is characterized in that the length of the cooling zone and the cooling speed of the yarn plug are proportionate to each other, so that the yarn plug is cooled in the cooling groove over a period of at least one second. This ensures a substantially complete cooling of the yarn plug, so as to permit attaining a high degree of crimp in the yarn.
- the length of the cooling zone and the cooling speed of the yarn plug are preferably selected such that the yarn plug is cooled on the circumference of the cooling drum over a period of at least two seconds.
- a predetermined cooling speed permits varying the length of the cooling zone, or a predetermined length of the cooling zone permits changing the cooling speed of the yarn plug.
- the cooling length is largely defined by the constructional condition of the cooling groove that is provided for receiving the yarn plug, and is often limited by an allowed space.
- the decisive ratio of length of the cooling zone to cooling speed of the yarn plug it is preferred to use the variant of the method, wherein the yarn plug advances before cooling at a yarn advancing speed, and during the cooling at a cooling speed, with the cooling speed being lower than the yarn advancing speed.
- the yarn plug advances before cooling at a yarn advancing speed, and during the cooling at a cooling speed, with the cooling speed being lower than the yarn advancing speed.
- the yarn plug is laid in the cooling groove in meander form, preferably in a plurality of superposed layers, it is possible to achieve a uniform filling of the groove and with that a uniform cooling of the yarn plug.
- the yarn plug is cooled by a cooling medium flow that penetrates the yarn plug.
- a cooling medium flow that penetrates the yarn plug.
- a source of overpressure to generate an additional cooling medium flow, which is blown, for example, as cooling air, onto the yarn plug.
- the method of the invention is characterized by a clearly increased crimp in the yarn.
- a carpet produced from such a yarn exhibited a high cover ability without any streak or cloud formation.
- the method of the invention is suited for all polymer types, such as, for example, PA and PP.
- the apparatus of the invention has been found particularly suitable, and wherein the width of the cooling groove for receiving and advancing the yarn plug is dimensioned such that the yarn plug is allowed to advance in meander form in a plurality of superposed layers. This allows to ensure an intensive cooling of the yarn plug even at high process speeds, since the yarn advancing speed can be adjusted substantially higher than the cooling speed of the yarn plug.
- a spacing is adjusted between the outlet of the texturing device and the cooling groove, with the width of the cooling groove being at least twice as large as the diameter of the yarn plug.
- the cooling groove can be provided on a belt-type carrier, or according to an advantageous further development of the invention, on the circumference of a cooling drum.
- This construction permits controlling the cooling speed for advancing the yarn plug in a simple manner by the drive of the cooling drum.
- a source of vacuum is associated to the cooling drum, which permits generating a cooling medium flow that penetrates the yarn plug and the screen-type bottom of the cooling groove.
- an additional blower with a source of overpressure may be associated to the cooling drum, which permits generating an additional cooling medium flow that is directed into the cooling groove and onto the yarn plug.
- FIG. 1 is a schematic view of a first embodiment of the apparatus according to the invention.
- FIG. 2.1 is a schematic fragmentary side view of the embodiment of FIG. 1 ;
- FIG. 2.2 is a schematic end view of the crimping device and the cooling device as shown in FIG. 2.1 ;
- FIG. 3 is a schematic view of a diagram for illustrating the interdependence of the cooling period of the yarn plug and the crimp of the yarn.
- FIG. 4 is a schematic view of a further embodiment for cooling the yarn plug.
- FIG. 1 schematically illustrates a first embodiment of an apparatus according to the invention for carrying out the method of the invention.
- the apparatus comprises a spin unit 1 that connects via a melt supply line 3 to a melt producer, for example, a pump or an extruder (not shown).
- the spin unit 1 contains a spin head 2 which mounts on its underside at least one spinneret 4 .
- the spinneret 4 includes a plurality of spin holes, through which a polymer melt supplied to the spin head 2 is extruded under pressure to a plurality of individual filaments 6 .
- a cooling shaft 5 Downstream of the spin unit 1 , a cooling shaft 5 is provided, through which the filaments 6 advance, so that the filaments emerging at approximately the melt temperature are cooled.
- the cooling shaft 5 could be connected, for example, to a cross-flow quench system, which blows a cooling air substantially crosswise to the filaments 6 .
- a yarn guide and a yarn lubrication device 8 extend in the outlet region of the cooling shaft 5 .
- the yarn lubrication device 8 applies to the filaments 6 a lubricant, so that the filaments 6 combine to a filament bundle 10 .
- a yarn feed godet unit 9 downstream of the cooling shaft 5 withdraws the filament bundle 10 from the spinneret 4 , and advances it to a subsequent draw godet unit 12 .
- the filament bundle 10 enters a crimping device 7 .
- the previously drawn filament bundle 10 is compressed to a yarn plug 13 .
- a cooling device 11 Arranged downstream of the crimping device 7 is a cooling device 11 with a moving cooling groove 26 .
- the cooling groove 26 serves to receive and cool the yarn plug 13 .
- the construction and operation of the cooling device 11 will be described in greater detail in the following.
- a withdrawal godet unit 14 withdraws the crimped yarn 15 , and advances it to a takeup unit 16 .
- the takeup unit 16 the crimped yarn 15 is wound to a package 17 .
- the construction and arrangement of the individual units of the embodiment shown in FIG. 1 are exemplary. For example, it is possible to supplement, exchange, or replace the treatment devices and guide elements. To produce a yarn cohesion of the filaments or the crimped filaments, it is possible to arrange an entanglement device 18 upstream and/or downstream of the crimping device.
- the embodiment of the apparatus according to the invention as shown in FIG. 1 is particularly suited for producing carpet yarns. To this end, it is necessary that the crimped yarn have a crimp that is adequate for final processing. Thus, the crimping device 7 and the cooling device 11 downstream thereof represent an important treatment step, which will be described in greater detail in the following.
- FIG. 2.1 illustrates a fragment of the embodiment of FIG. 1 , and is a schematic cross sectional view of the crimping device 7 and the subsequent cooling device 11 .
- FIG. 2.2 is a schematic end view of the units. Unless specific reference is made to one of the Figures, the following description will apply to both Figures.
- FIGS. 2.1 and 2 . 2 illustrate the crimping device 7 and the cooling device 11 downstream of the crimping device 7 of the embodiment of the apparatus according to the invention as shown in FIG. 1 .
- the crimping device 7 comprises a nozzle-shaped yarn feed channel 20 .
- the yarn feed channel 20 essentially consists of two sections, which are separated from each other by a narrowest cross section. In a first section, a short distance upstream of the narrowest cross section, the nozzle holes of an injector 19 extend into the yarn feed channel 20 .
- the injector 19 connects to a source of fluid (not shown).
- the yarn feed channel 20 widens and ends in a directly following stuffer box chamber 22 .
- the wall of the stuffer box chamber is made air permeable, and arranged inside a pressure relief chamber 21 .
- the stuffer box chamber 22 Downstream of the pressure relief chamber 21 , the stuffer box chamber 22 continues in the form of a discharge channel 23 having a substantially unchanged cross section. The end of the discharge channel 23 forms a plug outlet 24 .
- the cooling device 11 is constructed as a rotatable cooling drum 25 .
- the cooling drum 25 is driven at a circumferential speed via a drive shaft 30 by a drive 31 ( FIG. 2.2 ).
- the cooling drum 25 comprises a cooling groove 26 that extends over its circumference.
- a bottom 27 of the cooling groove 26 is made air permeable, so that a cooling medium flow that is preferably generated from the outside inward, penetrates and cools the yarn plug 13 advancing in the cooling groove 26 .
- a pressure chamber 34 is formed in the interior of the cooling drum 25 , which connects via a suction line 28 to a source of vacuum 29 . With that, the ambient air outside the cooling drum 26 is used as medium for cooling.
- the cooling groove 26 formed on the circumference of the cooling drum 25 has a width B.
- the width B of the cooling groove 26 is dimensioned in relation to the yarn plug 13 such that the width B is preferably greater than twice the amount of the yarn plug diameter D, i.e., B > 2D.
- a free spacing A extends to permit an unobstructed deposit of the yarn plug 13 in the cooling groove 26 .
- the spacing A remains unchanged.
- a heated conveying fluid enters the yarn feed channel 20 via the injector 19 .
- This causes a suction effect to develop at the upper end of the yarn feed channel 20 , which sucks the filament bundle 10 into the crimping device 7 .
- the conveying fluid advances the filament bundle 10 through the yarn feed channel 20 into the stuffer box chamber 22 .
- the filament bundle 10 compacts to a yarn plug 13 .
- the filament bundle 10 opens up, and the individual filaments come to lie on top of one another in loops and coils.
- the formation of the yarn plug 13 is largely defined by the quality of the conveying fluid and by the pressure of the conveying fluid.
- the upper region of the stuffer box chamber 22 is made air permeable in the form of air slots or lamellas, so that the conveying fluid is able to escape into a pressure relief chamber 21 and from there to the outside.
- the yarn plug 13 advances at a defined, adjusted speed v F through the stuffer box chamber 22 to the plug outlet 24 . From there, the yarn plug 13 enters the cooling groove 26 at the yarn advancing speed v F .
- the cooling groove 26 moves at a cooling speed v K , which is defined by the circumferential speed of the cooling drum 25 .
- the cooling speed v K is adjusted substantially lower than the yarn advancing speed v F .
- the yarn plug 13 is deposited in the cooling groove 26 in multiple layers and in meander form because of the unobstructed advance.
- the width B of the cooling groove 26 and the ratio of the yarn advancing speed to the cooling speed are adapted to each other such that they allow the yarn plug 13 to fill the cooling groove 26 uniformly.
- the yarn plug 13 advances through the cooling zone on the circumference of the cooling drum 25 .
- the cooling zone is defined by the degree of the looping of the yarn plug 13 on the cooling drum 25 .
- the yarn plug 13 loops the cooling drum 25 at an angle of 180°.
- the yarn plug 13 undergoes a cooling by the cooling medium flow that is generated from the outside inward. After cooling, the yarn plug 13 is disentangled at the end of the cooling zone to form the crimped yarn 15 .
- the length of the cooling zone is determined by the diameter of the cooling drum 25 and the degree of looping of the yarn plug 13 on the circumference of the cooling drum 25 .
- Cooling drums 25 normally have a diameter from 0.3 to 0.6 m. In an example, a cooling drum with a diameter of 400 mm was used. With a looping angle of 180°, this resulted in a length of the cooling zone of about 0.6 m.
- the yarn advancing speed v F was 90 m/min.
- the cooling speed v K was adjusted to 20 m/min. This resulted in a cooling time of about 1.8 seconds for cooling the yarn plug. With that, it was ensured that the yarn plug underwent an intensive cooling after advancing through the cooling zone, and that the yarn 15 thus exhibited a stable and high crimp.
- FIG. 3 a diagram illustrates the interdependence of time for cooling the yarn plug and the crimp in the produced crimped yarn.
- the illustrated slope of the curve makes it clear that in the range of less than 1 sec. cooling time, a high dependence exists between the cooling time and the crimp. As the cooling time increases, the curve becomes flatter to approximate asymptotically a limit value of the crimp.
- This relation between the cooling time and the crimp of the crimped yarn basically applies to all polymer types.
- the method of the invention ensures that at a minimum cooling time of 1 second, preferably 2 seconds, a high degree of crimp is obtained in the produced yarn.
- Tests with an additional cooling of the yarn plug by unheated air further resulted in that the positive effect of cooling with unheated air sets in only at longer dwelling times of about 0.5 seconds.
- the method of the invention accomplishes a maximum of crimp stability and crimp irrespective of the way of cooling the yarn plug.
- a uniform filling of the cooling groove 26 on the circumference of the cooling drum 25 is achieved.
- the multilayer deposit of the yarn plug in meander form is adjusted such that no significant gaps form within the cooling groove 26 . This results in a uniform flow resistance and thus in a uniform cooling of the yarn plug.
- the deposit of the yarn plug can be influenced by additional guide elements.
- the random orientation of the yarn plug in the cooling groove can also be realized in a simple manner by adjusting the spacing A ( FIG. 2.1 ) between the yarn plug outlet and the cooling groove, as well as by the selection of the width B of the cooling groove.
- FIG. 4 schematically illustrates a modification of the cooling device of the embodiment of FIG. 1 .
- a blower 32 is arranged in spaced relationship with the cooling drum 25 in the region of the cooling groove 26 , and connected to a source of overpressure 33 .
- the blower 32 has an elongate shape that overlaps at least one section of the cooling zone.
- a cooling medium flow is generated by the source of overpressure 33 through a plurality of air outlets, and directed to the yarn plug 13 in the cooling groove 26 .
- both the crimping device 7 and the cooling device 11 is identical with the foregoing embodiment, so that the foregoing description may herewith be incorporated by reference.
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- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
A method and an apparatus for spinning and crimping a synthetic multifilament yarn, wherein a filament bundle is spun from a polymer melt and compressed to a yarn plug. The yarn plug is advanced at a cooling speed and cooled within a cooling zone in a moving cooling groove. After cooling, the yarn plug is disentangled to form a crimped yarn, with the latter being wound to a package. The method of the invention also provides for selecting the length of the cooling zone and the cooling speed of the yarn plug such that the yarn plug is cooled in the cooling groove over a period of at least 1 second. To this end, the apparatus of the invention includes a cooling groove, whose width is dimensioned such that the yarn plug can be advanced in meander form in a plurality of superposed layers.
Description
- The present application is a divisional application of U.S. patent application Ser. No. 11/181,161, filed on Jul. 14, 2005, which is a continuation of international application PCT/EP2003/002345, filed 7 Mar., 2003, and which designates the U.S. The disclosure of the referenced applications are incorporated herein by reference.
- The invention relates to a method for spinning and crimping a synthetic multifilament yarn, as well as an apparatus for spinning and crimping a synthetic multifilament yarn.
- In the production of a crimped yarn, a plurality of strandlike filaments are extruded in a first step from a thermoplastic melt by means of a spin unit. After cooling, the filament bundle is combined and subsequently compressed to a yarn plug by means of a crimping device. In this process, the filaments of the filament bundle are deformed in the yarn plug to loops and coils by means of a preferably heated fluid. To realize such a deformation of the filaments, the crimping device includes a stuffer box chamber, in which the conveying medium compresses the filament bundle to the yarn plug. Thus, the desired loops and coils of the individual filaments form, as the filaments impact upon the yarn plug inside the stuffer box chamber.
- To obtain as much as possible a stable crimp, it is preferred to advance the yarn through a heated conveying medium and to heat it at the same time, so that a plastic deformation is able to occur in the individual filaments. To set the crimp, the yarn plug advances through a cooling zone. The cooling zone is formed by a cooling groove preferably on the circumference of a rotating cooling drum. In this arrangement, the length of the cooling zone is defined by the diameter of the cooling drum and by a partial looping on the circumference of the cooling drum. During the cooling, the cooling drum is driven for rotation, so that the circumferential speed of the cooling groove equals the cooling speed of the yarn plug, at which the yarn plug advances through the cooling zone. A method and an apparatus of this type for spinning and crimping a synthetic multifilament yarn are disclosed, for example, in DE 196 13 177 A1.
- According to DE 196 13 177 A1, a most effective and uniform cooling of the yarn plug requires a defined duration of the cooling. Thus, the art proposes to increase the dwelling time in that the yarn plug advances with a partial looping over a second, subsequent cooling drum. With that, however, it is not possible to achieve an uninterrupted, uniform cooling of the yarn plug, since the transition from the first cooling drum to the second cooling drum represents each time an undefined interruption of the cooling process.
- U.S. Pat. No. 5,974,777 discloses a method and an apparatus for cooling a yarn plug, wherein the yarn plug advances with several loopings over the circumference of a cooling drum. While this procedure permits achieving longer dwelling times for cooling the yarn plug even at higher process speeds, it has the disadvantage that the combined yarn plugs interfere with one another on the circumference of the cooling drum, so that, for example, individual filaments of adjacent plugs interlock and lead to undesired filament breaks upon disentanglement of the plugs. In addition, it is necessary to displace the yarn plugs on the cooling drum surface, so that additional shearing forces act upon the plug. Furthermore, such a displacement on the circumference of the cooling drum may cause individual filaments to interlock on the cooling surface.
- It is therefore an object of the invention to further develop a generic type of method and apparatus for spinning and crimping a synthetic multifilament yarn such that after cooling the yarn plug, it is ensured that a stable and high crimp of the yarn is achieved irrespective of the production speed.
- The invention is based on the discovery that the dwelling time of the yarn plug within the cooling zone or in the cooling groove is the decisive parameter for cooling the yarn plug. Known as further parameters for cooling the yarn plug are the temperature difference between the yarn plug and the cooling medium as well as the volume flow of the cooling medium. However, the influence of these parameters is small in proportion with the duration of the cooling. For example, in tests with a textured yarn of a polyamide PA6 it was possible to find that duplicating the time from 0.25 seconds to 0.5 seconds resulted in an improvement of the crimp of about 10%. A further duplication of the cooling period from 0.5 seconds to 1 second allowed to achieve a further improvement of the crimp of 4%. This asymptotic behavior between dwelling time and crimp applies to all types of polymers. Thus, the length of the cooling zone and the cooling speed of the yarn plug are decisive parameters for the cooling period of the yarn plug. The method of the invention is characterized in that the length of the cooling zone and the cooling speed of the yarn plug are proportionate to each other, so that the yarn plug is cooled in the cooling groove over a period of at least one second. This ensures a substantially complete cooling of the yarn plug, so as to permit attaining a high degree of crimp in the yarn.
- In making further use of the asymptotic behavior between the duration of the cooling and the crimp of the textured yarn, the length of the cooling zone and the cooling speed of the yarn plug are preferably selected such that the yarn plug is cooled on the circumference of the cooling drum over a period of at least two seconds.
- In this process, there basically exist two possibilities of maintaining the ratio of the length of the cooling zone to the cooling speed of the yarn plug, which is decisive for cooling the yarn plug. Thus, a predetermined cooling speed permits varying the length of the cooling zone, or a predetermined length of the cooling zone permits changing the cooling speed of the yarn plug. The cooling length is largely defined by the constructional condition of the cooling groove that is provided for receiving the yarn plug, and is often limited by an allowed space. However, to maintain even in the case of relatively short cooling zones, the decisive ratio of length of the cooling zone to cooling speed of the yarn plug, it is preferred to use the variant of the method, wherein the yarn plug advances before cooling at a yarn advancing speed, and during the cooling at a cooling speed, with the cooling speed being lower than the yarn advancing speed. Thus, more yarn plug material advances to the cooling zone per unit time. Consequently, the greater the difference is between the yarn advancing speed and the cooling speed, the longer the period for cooling the yarn plug.
- With the use of the advantageous further development of the method according to the invention, wherein at the beginning of the cooling zone, the yarn plug is laid in the cooling groove in meander form, preferably in a plurality of superposed layers, it is possible to achieve a uniform filling of the groove and with that a uniform cooling of the yarn plug.
- Preferably, the yarn plug is cooled by a cooling medium flow that penetrates the yarn plug. To this end, it is possible to generate the cooling medium flow by a source of vacuum. To intensify cooling, it also possible to use a source of overpressure to generate an additional cooling medium flow, which is blown, for example, as cooling air, onto the yarn plug.
- The method of the invention is characterized by a clearly increased crimp in the yarn. A carpet produced from such a yarn exhibited a high cover ability without any streak or cloud formation.
- The method of the invention is suited for all polymer types, such as, for example, PA and PP.
- To be able to carry out the method of the invention, the apparatus of the invention has been found particularly suitable, and wherein the width of the cooling groove for receiving and advancing the yarn plug is dimensioned such that the yarn plug is allowed to advance in meander form in a plurality of superposed layers. This allows to ensure an intensive cooling of the yarn plug even at high process speeds, since the yarn advancing speed can be adjusted substantially higher than the cooling speed of the yarn plug.
- To achieve a uniform filling of the cooling groove, a spacing is adjusted between the outlet of the texturing device and the cooling groove, with the width of the cooling groove being at least twice as large as the diameter of the yarn plug.
- Basically, the cooling groove can be provided on a belt-type carrier, or according to an advantageous further development of the invention, on the circumference of a cooling drum. This construction permits controlling the cooling speed for advancing the yarn plug in a simple manner by the drive of the cooling drum.
- Preferably, a source of vacuum is associated to the cooling drum, which permits generating a cooling medium flow that penetrates the yarn plug and the screen-type bottom of the cooling groove.
- For additionally cooling the yarn plug inside the cooling groove, an additional blower with a source of overpressure may be associated to the cooling drum, which permits generating an additional cooling medium flow that is directed into the cooling groove and onto the yarn plug.
- In the following, the method of the invention is described in greater detail by reference to preferred embodiments of the apparatus according to the invention. In the drawing:
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FIG. 1 is a schematic view of a first embodiment of the apparatus according to the invention; -
FIG. 2.1 is a schematic fragmentary side view of the embodiment ofFIG. 1 ; -
FIG. 2.2 is a schematic end view of the crimping device and the cooling device as shown inFIG. 2.1 ; -
FIG. 3 is a schematic view of a diagram for illustrating the interdependence of the cooling period of the yarn plug and the crimp of the yarn; and -
FIG. 4 is a schematic view of a further embodiment for cooling the yarn plug. -
FIG. 1 schematically illustrates a first embodiment of an apparatus according to the invention for carrying out the method of the invention. The apparatus comprises aspin unit 1 that connects via a melt supply line 3 to a melt producer, for example, a pump or an extruder (not shown). Thespin unit 1 contains aspin head 2 which mounts on its underside at least onespinneret 4. Thespinneret 4 includes a plurality of spin holes, through which a polymer melt supplied to thespin head 2 is extruded under pressure to a plurality ofindividual filaments 6. Downstream of thespin unit 1, a coolingshaft 5 is provided, through which thefilaments 6 advance, so that the filaments emerging at approximately the melt temperature are cooled. To this end, the coolingshaft 5 could be connected, for example, to a cross-flow quench system, which blows a cooling air substantially crosswise to thefilaments 6. - In the outlet region of the cooling
shaft 5, a yarn guide and ayarn lubrication device 8 extend. Theyarn lubrication device 8 applies to the filaments 6 a lubricant, so that thefilaments 6 combine to afilament bundle 10. A yarnfeed godet unit 9 downstream of the coolingshaft 5 withdraws thefilament bundle 10 from thespinneret 4, and advances it to a subsequentdraw godet unit 12. From thedraw godet unit 12, thefilament bundle 10 enters a crimpingdevice 7. In the crimpingdevice 7, the previously drawnfilament bundle 10 is compressed to ayarn plug 13. - Arranged downstream of the crimping
device 7 is acooling device 11 with a movingcooling groove 26. The coolinggroove 26 serves to receive and cool theyarn plug 13. The construction and operation of thecooling device 11 will be described in greater detail in the following. To disentangle theyarn plug 13, awithdrawal godet unit 14 withdraws the crimpedyarn 15, and advances it to atakeup unit 16. In thetakeup unit 16, the crimpedyarn 15 is wound to apackage 17. - The construction and arrangement of the individual units of the embodiment shown in
FIG. 1 are exemplary. For example, it is possible to supplement, exchange, or replace the treatment devices and guide elements. To produce a yarn cohesion of the filaments or the crimped filaments, it is possible to arrange anentanglement device 18 upstream and/or downstream of the crimping device. - The embodiment of the apparatus according to the invention as shown in
FIG. 1 is particularly suited for producing carpet yarns. To this end, it is necessary that the crimped yarn have a crimp that is adequate for final processing. Thus, the crimpingdevice 7 and thecooling device 11 downstream thereof represent an important treatment step, which will be described in greater detail in the following. -
FIG. 2.1 illustrates a fragment of the embodiment ofFIG. 1 , and is a schematic cross sectional view of the crimpingdevice 7 and thesubsequent cooling device 11.FIG. 2.2 is a schematic end view of the units. Unless specific reference is made to one of the Figures, the following description will apply to both Figures. -
FIGS. 2.1 and 2.2 illustrate the crimpingdevice 7 and thecooling device 11 downstream of the crimpingdevice 7 of the embodiment of the apparatus according to the invention as shown inFIG. 1 . The crimpingdevice 7 comprises a nozzle-shapedyarn feed channel 20. Theyarn feed channel 20 essentially consists of two sections, which are separated from each other by a narrowest cross section. In a first section, a short distance upstream of the narrowest cross section, the nozzle holes of aninjector 19 extend into theyarn feed channel 20. Theinjector 19 connects to a source of fluid (not shown). In the second section, downstream of the narrowest cross section, theyarn feed channel 20 widens and ends in a directly following stufferbox chamber 22. - In the inlet region of the
stuffer box chamber 22, the wall of the stuffer box chamber is made air permeable, and arranged inside apressure relief chamber 21. Downstream of thepressure relief chamber 21, thestuffer box chamber 22 continues in the form of adischarge channel 23 having a substantially unchanged cross section. The end of thedischarge channel 23 forms aplug outlet 24. - The
cooling device 11 is constructed as arotatable cooling drum 25. The coolingdrum 25 is driven at a circumferential speed via adrive shaft 30 by a drive 31 (FIG. 2.2 ). To receive theyarn plug 13 produced by the crimpingdevice 7, the coolingdrum 25 comprises a coolinggroove 26 that extends over its circumference. A bottom 27 of the coolinggroove 26 is made air permeable, so that a cooling medium flow that is preferably generated from the outside inward, penetrates and cools theyarn plug 13 advancing in the coolinggroove 26. To this end, apressure chamber 34 is formed in the interior of thecooling drum 25, which connects via asuction line 28 to a source ofvacuum 29. With that, the ambient air outside the coolingdrum 26 is used as medium for cooling. - The cooling
groove 26 formed on the circumference of thecooling drum 25 has a width B. The width B of the coolinggroove 26 is dimensioned in relation to theyarn plug 13 such that the width B is preferably greater than twice the amount of the yarn plug diameter D, i.e., B>2D. - Between the
plug outlet 24 and the coolinggroove 26, a free spacing A extends to permit an unobstructed deposit of theyarn plug 13 in the coolinggroove 26. During the crimping process, the spacing A remains unchanged. - In the crimping
device 7, a heated conveying fluid enters theyarn feed channel 20 via theinjector 19. This causes a suction effect to develop at the upper end of theyarn feed channel 20, which sucks thefilament bundle 10 into the crimpingdevice 7. The conveying fluid advances thefilament bundle 10 through theyarn feed channel 20 into thestuffer box chamber 22. In thestuffer box chamber 22, thefilament bundle 10 compacts to ayarn plug 13. In so doing, thefilament bundle 10 opens up, and the individual filaments come to lie on top of one another in loops and coils. In this process, the formation of theyarn plug 13 is largely defined by the quality of the conveying fluid and by the pressure of the conveying fluid. As conveying fluid it is preferred to use hot air. To decrease the pressure of the conveying fluid, the upper region of thestuffer box chamber 22 is made air permeable in the form of air slots or lamellas, so that the conveying fluid is able to escape into apressure relief chamber 21 and from there to the outside. - The yarn plug 13 advances at a defined, adjusted speed vF through the
stuffer box chamber 22 to theplug outlet 24. From there, theyarn plug 13 enters the coolinggroove 26 at the yarn advancing speed vF. The coolinggroove 26 moves at a cooling speed vK, which is defined by the circumferential speed of thecooling drum 25. The cooling speed vK is adjusted substantially lower than the yarn advancing speed vF. As a function of the ratio of the yarn advancing speed to the cooling speed, theyarn plug 13 is deposited in the coolinggroove 26 in multiple layers and in meander form because of the unobstructed advance. In this connection, the width B of the coolinggroove 26 and the ratio of the yarn advancing speed to the cooling speed are adapted to each other such that they allow theyarn plug 13 to fill the coolinggroove 26 uniformly. - The yarn plug 13 advances through the cooling zone on the circumference of the
cooling drum 25. The cooling zone is defined by the degree of the looping of theyarn plug 13 on thecooling drum 25. In the embodiment ofFIG. 2.1 , the yarn plug 13 loops thecooling drum 25 at an angle of 180°. Within the cooling zone, theyarn plug 13 undergoes a cooling by the cooling medium flow that is generated from the outside inward. After cooling, theyarn plug 13 is disentangled at the end of the cooling zone to form the crimpedyarn 15. - The length of the cooling zone is determined by the diameter of the
cooling drum 25 and the degree of looping of theyarn plug 13 on the circumference of thecooling drum 25. Cooling drums 25 normally have a diameter from 0.3 to 0.6 m. In an example, a cooling drum with a diameter of 400 mm was used. With a looping angle of 180°, this resulted in a length of the cooling zone of about 0.6 m. The yarn advancing speed vF was 90 m/min. The cooling speed vK was adjusted to 20 m/min. This resulted in a cooling time of about 1.8 seconds for cooling the yarn plug. With that, it was ensured that the yarn plug underwent an intensive cooling after advancing through the cooling zone, and that theyarn 15 thus exhibited a stable and high crimp. - In
FIG. 3 , a diagram illustrates the interdependence of time for cooling the yarn plug and the crimp in the produced crimped yarn. The illustrated slope of the curve makes it clear that in the range of less than 1 sec. cooling time, a high dependence exists between the cooling time and the crimp. As the cooling time increases, the curve becomes flatter to approximate asymptotically a limit value of the crimp. This relation between the cooling time and the crimp of the crimped yarn basically applies to all polymer types. In this respect, the method of the invention ensures that at a minimum cooling time of 1 second, preferably 2 seconds, a high degree of crimp is obtained in the produced yarn. - Tests with an additional cooling of the yarn plug by unheated air further resulted in that the positive effect of cooling with unheated air sets in only at longer dwelling times of about 0.5 seconds. Thus, the method of the invention accomplishes a maximum of crimp stability and crimp irrespective of the way of cooling the yarn plug.
- Preferably, a uniform filling of the cooling
groove 26 on the circumference of thecooling drum 25 is achieved. The multilayer deposit of the yarn plug in meander form is adjusted such that no significant gaps form within the coolinggroove 26. This results in a uniform flow resistance and thus in a uniform cooling of the yarn plug. The deposit of the yarn plug can be influenced by additional guide elements. However, the random orientation of the yarn plug in the cooling groove can also be realized in a simple manner by adjusting the spacing A (FIG. 2.1 ) between the yarn plug outlet and the cooling groove, as well as by the selection of the width B of the cooling groove. The ratio of the yarn advancing speed vF, at which the yarn plug advances before being cooled, to the cooling speed vK, at which the yarn plug advances while being cooled, is in a range from vF/vK=0.1 to 0.4. With that, it is possible to realize even high production speeds of more than 3,000 m/min. (crimping speed) and a long dwelling time. -
FIG. 4 schematically illustrates a modification of the cooling device of the embodiment ofFIG. 1 . In this modification, a blower 32 is arranged in spaced relationship with thecooling drum 25 in the region of the coolinggroove 26, and connected to a source of overpressure 33. The blower 32 has an elongate shape that overlaps at least one section of the cooling zone. A cooling medium flow is generated by the source of overpressure 33 through a plurality of air outlets, and directed to theyarn plug 13 in the coolinggroove 26. - The construction of both the crimping
device 7 and thecooling device 11 is identical with the foregoing embodiment, so that the foregoing description may herewith be incorporated by reference. - Many modifications and other embodiments of the invention set forth herein will come to mind to one skilled in the art to which the invention pertains having the benefit of the teachings presented in the foregoing description and the associated drawings. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A method for spinning and crimping a synthetic multifilament yarn, comprising the steps of
spinning at least one filament bundle from a polymeric melt and compressing the bundle to a yarn plug,
cooling the yarn plug by advancing the plug at a cooling speed through a cooling zone which comprises a moving cooling groove,
disentangling the yarn plug after cooling to form a crimped yarn which is wound to a package, and
wherein the length of the cooling zone and the cooling speed of the yarn plug are in proportion with respect to each other and so that the yarn plug is cooled in the cooling groove over a time period of at least one second.
2. The method of claim 1 , wherein the yarn plug is cooled in the cooling groove over a period of at least two seconds.
3. The method of claim 1 , wherein before being cooled, the yarn plug advances at a yarn advancing speed, and while being cooled at the cooling speed, with the cooling speed being lower than the yarn advancing speed.
4. The method of claim 3 , wherein the yarn advancing speed of the yarn plug is at least twice as high as the cooling speed of the yarn plug.
5. The method of claim 1 , wherein at the beginning of the cooling zone the yarn plug is laid in the cooling groove in meander form.
6. The method of claim 5 , wherein the yarn plug advances in the cooling groove on the circumference of a rotatably driven cooling drum, with the bottom of the cooling groove forming an air permeable cooling surface.
7. The method of claim 1 , wherein the yarn plug is cooled within the cooling zone by a cooling medium flow.
8. The method of claim 7 , wherein the cooling medium flow is generated by a source of vacuum and/or a source of overpressure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/711,276 US20130174531A1 (en) | 2003-01-15 | 2012-12-11 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10301212 | 2003-01-15 | ||
DE10301212.5 | 2003-01-15 | ||
PCT/EP2003/002345 WO2004063440A1 (en) | 2003-01-15 | 2003-03-07 | Method and device for spinning and crimping a synthetic thread |
US11/181,161 US8342834B2 (en) | 2003-01-15 | 2005-07-14 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
US13/711,276 US20130174531A1 (en) | 2003-01-15 | 2012-12-11 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/181,161 Division US8342834B2 (en) | 2003-01-15 | 2005-07-14 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
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US20130174531A1 true US20130174531A1 (en) | 2013-07-11 |
Family
ID=32694890
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US11/181,161 Expired - Fee Related US8342834B2 (en) | 2003-01-15 | 2005-07-14 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
US13/711,276 Abandoned US20130174531A1 (en) | 2003-01-15 | 2012-12-11 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
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US11/181,161 Expired - Fee Related US8342834B2 (en) | 2003-01-15 | 2005-07-14 | Method and apparatus for spinning and crimping a synthetic multifilament yarn |
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US (2) | US8342834B2 (en) |
EP (1) | EP1583855B1 (en) |
JP (1) | JP4386845B2 (en) |
CN (1) | CN1732297B (en) |
AT (1) | ATE513074T1 (en) |
WO (1) | WO2004063440A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150152596A1 (en) * | 2012-07-02 | 2015-06-04 | Casar Drahtseilwerk Saar Gmbh | Device and method for producing a strand or a cable |
US9410269B2 (en) | 2012-01-07 | 2016-08-09 | Oerlikon Textile Gmbh & Co. Kg | Method and device for crimping a multifilament thread |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004022469A1 (en) * | 2004-05-06 | 2005-12-01 | Saurer Gmbh & Co. Kg | Method and apparatus for crimping a multifilament thread |
EP1807561A1 (en) * | 2004-11-05 | 2007-07-18 | Saurer GmbH & Co. KG | Method and device for spinning and texturing a synthetic thread |
ITMI20081112A1 (en) * | 2007-08-02 | 2009-02-03 | Oerlikon Textile Gmbh & Co Kg | DEVICE TO ENRICH BRANCHES OF SYNTHETIC FIBERS |
CN101838871B (en) * | 2009-12-28 | 2012-06-13 | 宁波荣溢化纤科技有限公司 | Crimping machine cooling device, crimping machine and silk thread crimping method |
DE102012004747A1 (en) * | 2012-03-08 | 2013-09-12 | Oerlikon Textile Gmbh & Co. Kg | curling |
US9951445B2 (en) | 2012-08-23 | 2018-04-24 | Columbia Insurance Company | Systems and methods for improving and controlling yarn texture |
US9896786B2 (en) | 2012-08-23 | 2018-02-20 | Columbia Insurance Company | Systems and methods for improving and controlling yarn texture |
WO2014145896A1 (en) * | 2013-03-15 | 2014-09-18 | Shaw Industries Group. Inc | Apparatus for improving and controlling yarn texture |
BE1021905B1 (en) * | 2014-07-18 | 2016-01-26 | Iropa Ag | TEXTURE DEVICE |
BE1024740B1 (en) * | 2016-11-22 | 2018-06-18 | Wiele Michel Van De Nv | Device and method for the manufacture of crimped textile yarn and cooling drum for such a device |
CN106592031B (en) * | 2017-01-24 | 2019-08-30 | 青岛青禾人造草坪股份有限公司 | Artificial lawn fiber silk process units and method |
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US6305059B1 (en) * | 1999-02-06 | 2001-10-23 | Barmag Ag | Method and apparatus for stuffer box crimping a yarn |
US20010038159A1 (en) * | 2000-04-11 | 2001-11-08 | Method And Apparatus For Spinning And Crimping A Multifilament Yarn | Method and apparatus for spinning and crimping a multifilament yarn |
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DE19613177A1 (en) * | 1995-04-10 | 1996-10-17 | Barmag Barmer Maschf | Cooling and loosening of yarn plug from jet texturing stuffer box |
US5974777A (en) * | 1998-04-21 | 1999-11-02 | Davis; David M | Yarn texturizer cooling drum |
JP2003525359A (en) * | 2000-03-01 | 2003-08-26 | バルマーク アクチエンゲゼルシヤフト | Method and apparatus for staff crimping |
EP1397541B2 (en) * | 2001-05-10 | 2012-02-15 | Oerlikon Textile GmbH & Co. KG | Compressive crimping device for a synthetic multi-threaded yarn |
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2003
- 2003-03-07 CN CN038258226A patent/CN1732297B/en not_active Expired - Fee Related
- 2003-03-07 AT AT03815046T patent/ATE513074T1/en active
- 2003-03-07 EP EP20030815046 patent/EP1583855B1/en not_active Expired - Lifetime
- 2003-03-07 JP JP2004565924A patent/JP4386845B2/en not_active Expired - Fee Related
- 2003-03-07 WO PCT/EP2003/002345 patent/WO2004063440A1/en active Application Filing
-
2005
- 2005-07-14 US US11/181,161 patent/US8342834B2/en not_active Expired - Fee Related
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2012
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US6305059B1 (en) * | 1999-02-06 | 2001-10-23 | Barmag Ag | Method and apparatus for stuffer box crimping a yarn |
US20010038159A1 (en) * | 2000-04-11 | 2001-11-08 | Method And Apparatus For Spinning And Crimping A Multifilament Yarn | Method and apparatus for spinning and crimping a multifilament yarn |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9410269B2 (en) | 2012-01-07 | 2016-08-09 | Oerlikon Textile Gmbh & Co. Kg | Method and device for crimping a multifilament thread |
US20150152596A1 (en) * | 2012-07-02 | 2015-06-04 | Casar Drahtseilwerk Saar Gmbh | Device and method for producing a strand or a cable |
US10190256B2 (en) * | 2012-07-02 | 2019-01-29 | Casar Drahtseilwerk Saar Gmbh | Device and method for producing a strand or a cable |
Also Published As
Publication number | Publication date |
---|---|
JP4386845B2 (en) | 2009-12-16 |
WO2004063440A1 (en) | 2004-07-29 |
CN1732297A (en) | 2006-02-08 |
US20050242461A1 (en) | 2005-11-03 |
EP1583855B1 (en) | 2011-06-15 |
ATE513074T1 (en) | 2011-07-15 |
US8342834B2 (en) | 2013-01-01 |
EP1583855A1 (en) | 2005-10-12 |
CN1732297B (en) | 2012-04-25 |
JP2006513329A (en) | 2006-04-20 |
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