JP6092235B2 - Apparatus for melt spinning and cooling synthetic filaments - Google Patents

Description

  The present invention relates to an apparatus for melt spinning and cooling a synthetic filament according to the first part of claim 1.

  When producing synthetic yarns, it is common for a large number of filaments to be cooled in a subsequent cooling zone after extrusion through a spinning nozzle, thereby hardening the thermoplastic material and thus allowing the filaments to be combined into multifilament yarns. Known. In order to cool the freshly extruded filament, a cooling air stream is generated and directed to the filament. At this time, a system that supplies a cooling air flow to the filaments through a porous cylinder has been found useful in order to be able to cool the individual filament strands inside the filament bundle. Yes. Such a device is known, for example, from EP-A-1 505 180.

  In this known apparatus, a blow chamber is arranged under a spinning beam holding a plurality of spinning nozzles in a row arrangement format. The blow chamber is held below the spinning beam. In this case, each spinning nozzle is provided with a corresponding porous cylinder inside the blow chamber. The porous cylinder has a gas porous cylinder wall so that the cooling air blown into the blow chamber is uniformly from all sides through the porous cylinder towards the filaments that advance from the spinning nozzle. Flowing. A heat insulator is provided between the spinning beam and the cooling device. As a result, the temperature adjustment of the spinning nozzle necessary for extruding the filament is performed without being influenced by the subsequent filament cooling.

  When extruding certain polymers, such as polyamides, highly volatile materials such as monomers and oligomers are generated and such volatile materials may adhere or deposit in the surroundings without being controlled. Such an adhesion or deposition tendency has been confirmed to be strong at the upper end of the porous cylinder, which causes the blow opening in the cylinder wall of the porous cylinder to adhere and close. As a result, the cooling of the filament is non-uniform.

  In order to restrain or agglomerate such monomers, it is generally known in the prior art to supply water vapor below the spinning nozzle. For example, as described in DE 199 20 682, this so-called nozzle wrapping, which is like a bale, does however condense water vapor, especially on the cold wall of the porous cylinder. And has the disadvantage of forming water.

  Therefore, the object of the present invention is to improve the apparatus for melt spinning and cooling synthetic filaments described in the first part of claim 1 so that the polymer is applied to the porous cylinder used for cooling the filaments during spinning. It is to avoid depositing inconveniently.

  In order to solve this problem, in the configuration of the present invention, heating means is provided corresponding to the upper end portion of the porous cylinder, and the upper end portion of the porous cylinder can be heated by the heating means. .

  Further preferred aspects of the invention are defined by the configurations described in the dependent claims and combinations of these configurations.

  The present invention is based on the recognition that monomer deposition is primarily related to temperature differences. For example, it has been observed that no or very little deposit is formed on the hot member. Therefore, by increasing the upper end portion of the porous cylinder, it is avoided that the generation of deposits increases.

  Basically, an active heating means such as a heating sleeve is suitable as the heating means, and this heating means is arranged around the outer or inner wall of the porous cylinder.

  However, passive heating means that utilize existing heat are particularly advantageous. Such a heating means is preferably formed by a thermally conductive metal ring, which is held in contact with the upper end of the porous cylinder and at the free heating end, It enters into a free space formed between the porous cylinder and the spinning nozzle. If comprised in this way, the heat | fever emitted from the spinning nozzle and the spinning beam can be used suitably in order to heat the upper end part of a porous cylinder. The thermally conductive metal ring is in this case preferably made of a metal with a very high thermal conductivity, whereby heat absorbed by convection through the heated end is supplied directly to the upper end of the porous cylinder. be able to.

  The heated end of the metal ring may optionally be held in free space without contact with the heat-passing member of the spinning beam or in a cantilevered manner depending on the surrounding characteristics and configuration. What is important in this case is that, during direct contact, the heat release takes place unaffected by the temperature adjustment of the spinning nozzle.

  In order to be able to cover at least the non-flowing end of the porous cylinder, the metal ring has a cylindrical heating collar at the holding end, the heating collar entering the porous cylinder. doing. This arrangement further provides a zone under the spinning nozzle where the filament is guided without being actively cooled.

  In order to avoid material stresses between the metal ring and the porous cylinder as much as possible during operation, the metal ring is preferably against the inner wall of the porous cylinder without contact with the cylindrical heating collar. Retained.

  In this case, the exchangeability can be further improved if the metal ring is mounted on the upper end of the porous cylinder without additional fixing.

  In order to delay the cooling of the filament in order to influence the specific physical properties of the yarn, in another aspect of the invention, a reheating device is provided between the spinning nozzle and the upper end of the porous cylinder. The temperature-controlled free space between the spinning nozzle and the porous cylinder is formed by the reheating device. In this case, the metal ring can be heated at the same time using the thermal energy in the temperature-adjusted free space, which is preferable. The heating end of the metal ring preferably enters the temperature-controlled free space of the reheating device.

  In order to allow the monomers and oligomers to be restrained as soon as possible after extrusion, in yet another aspect of the present invention, a steam supply device is provided corresponding to the spinning nozzle, and the steam supply device provides a steam supply device. Can be introduced into the free space under the spinning nozzle. If comprised in this way, what is called a nozzle covering effect | action will be attained, and this effect | action can be combined suitably with a suction effect | action.

  Next, several embodiments of the apparatus according to the present invention will be described with reference to the drawings.

1 is a cross-sectional view showing an embodiment of an apparatus according to the present invention. It is a longitudinal cross-sectional view of embodiment of the apparatus based on this invention shown in FIG. It is a cross-sectional view showing another embodiment of the device according to the present invention. FIG. 6 is a cross-sectional view showing still another embodiment of the apparatus according to the present invention. FIG. 6 is a cross-sectional view showing still another embodiment of the device according to the present invention.

  1 and 2 show a first embodiment of the device according to the invention in several ways. The first embodiment is shown in a cross-sectional view in FIG. 1 with the illustration of the yarn runway omitted, and in FIG. 2 is shown in a longitudinal sectional view together with the yarn runway. Accordingly, the description below is for both drawings, unless one of the drawings is selected.

  An embodiment of the device according to the invention has a spinning beam 1 which holds a plurality of spinning nozzles 2 side by side in a row arrangement on its lower side 12. The spinning nozzle 2 is connected to the spinning pump 3 through a plurality of melt conduits 6 inside the spinning beam. The spinning pump 3 is driven via a pump driving device. In this case, the spinning pump 3 has separate conveying means for each spinning nozzle 2. The spinning pump 3 is connected to a melt source (not shown) via a melt supply path 5. Since the spinning beam 1 is formed to be heated, the spinning nozzle 2, the melt line 6 and the spinning pump 3 are heated.

  The spinning beam 1 is provided with a cooling device 4 corresponding to the lower surface 12. The cooling device 4 is formed by a blow box 8 in the illustrated embodiment, and the blow box 8 is connected to the lower surface 12 of the spinning beam 1. The blow box 8 is formed by a top box 8.1 and a bottom box 8.2 which are joined together. Between the top box 8.1 and the bottom box 8.2, a plate 26 with holes is arranged. The plate 26 with holes separates the top box 8.1 and the bottom box 8.2 from each other. Yes. The top box 8.1 closes the upper blow chamber 9 and the bottom box 8.2 closes the lower blow chamber 10.

  The blow box 8 has thread openings 20 therethrough on the upper side 11 below the spinning nozzle 2, which thread openings 20 are provided by a porous cylinder 17 inserted in the upper blow chamber 9 and It is continued by the tube piece 25 inserted in the lower blow chamber 10. For this purpose, the perforated plate 26 has a plurality of openings corresponding to the porous cylinder 17 and the tube piece 25. The porous cylinders 17 are all formed identically and have a gas permeable cylinder wall. The cylinder wall is formed by an inner wall 18 and an outer wall 19 in the illustrated embodiment. For example, the inner wall 18 may be formed of a perforated plate, and the outer wall 19 may be formed of a wire mesh or a metal woven fabric. On the other hand, the tube piece 25 is formed with a closed wall. The lower blow chamber 10 is connected to the air supply passage 24 in the side surface or in the longitudinal direction, and cooling air is introduced into the lower blow chamber 10 through the air supply passage 24. The air supply passage 24 is connected to the air supply unit 29. In the region of the tube piece 25, the bottom box 8.2 has a plurality of outflow openings 28, so that the filament can penetrate the blow box 8 for cooling purposes. The blow box 8 is formed by two lifting cylinders 27.1 and 27.2 engaged with the blow box 8 so that the height can be adjusted. During operation, the blow box 8 is pressed against the lower surface 12 of the spinning beam 1 by lifting cylinders 27.1, 27.2.

  In order to seal the yarn opening 20, a sealing system 13 is arranged between the lower side surface 12 of the spinning beam 1 and the upper side surface 11 of the blow box 8. This sealing system 13 is formed by a pressing plate 14 which is rigidly connected to the lower side 12 of the spinning beam 1. The pressing plate 14 is held by the spinning beam 1 via a plurality of insulating plates 16. For sealing, the pressing plate 14 cooperates with a foam sealing element 15 held on the upper side 11 of the blow box 8.

  As can be seen in particular from FIG. 1, the sealing system 13 is cut out so that a free space 21 is formed between the spinning nozzle 2 and the upper end of the porous cylinder 17. In this case, the upper end portion of the porous cylinder 17 is freely accessible from the inside, and thereby the metal ring 23 can be accommodated. The metal ring 23 has a free heating end 23.1 that enters the free space 21. The metal ring 23 is in contact with the end of the inner wall 18 of the porous cylinder 17 at the holding end 23.2 located on the opposite side. The holding end 23.2 has a heating collar 23.3 that enters into the porous cylinder 17. In this case, the heating collar 23.3 of the metal ring 23 has an outer diameter somewhat smaller than the inner diameter of the inner wall 18 of the porous cylinder 17. As a result, slight play is formed between the heating collar 23.3 and the inner wall 18. The metal ring 23 is made of a metal having good thermal conductivity. In order to facilitate the entry of the filament into the porous cylinder 17, the heating end 23.1 is formed with a larger diameter than the heating collar 23.3. Accordingly, the metal ring 23 is formed with a hopper-shaped inner contour.

  As can be seen from FIGS. 1 and 2, the blow box 8 is configured to be adjustable in height by two lifting cylinders 27.1 and 27.2 acting on the blow box 8. During operation, the blow box 8 is pressed against the lower surface 12 of the spinning beam 1 by the lifting cylinders 27.1, 27.2, whereby the foam seal element 15 is pressed against the pressing plate 14 and the separation surface or seam is sealed. The In the operating position, the heating end 23.1 of the metal ring 23 enters a free space 21 defined by the heated spinning beam 1 and the heated spinning nozzle 2. The metal ring 23 is thereby heated to a temperature in excess of 100 ° C. and heat energy is introduced directly into the inner wall 18 of the porous cylinder 17 via the holding end 23.2. The upper end portion of the porous cylinder 17 is directly heated by the metal ring 23. Thereby, the deposit of the deposit | attachment in the upper end part of the porous cylinder 17 can be avoided.

  A cooling air flow is introduced into the lower blow chamber 10 via the air supply passage 24 to cool the filament. The cooling air uniformly reaches the upper blow chamber 9 from the lower blow chamber 10 through the perforated plate 26. Cooling air from the upper blow chamber 9 is supplied to the filament via the porous cylinder 17. The filament indicated by reference numeral 7 passes through the tube piece 25 in the lower blow chamber 10 and exits from the blow box 8 via the outflow opening 28.

  During operation for a long time, deposits on the lower surface of the spinning nozzle 2 cannot be avoided, and due to such deposits, the lower surface of the spinning nozzle 2 must be cleaned at regular intervals. For this purpose, the blow box 8 is guided to a lower maintenance position (not shown here) by the lifting cylinders 27.1, 27.2. In the maintenance position of the blow box 8, the metal rings 23 can be removed from the yarn openings 20 and replaced.

  In the embodiment shown in FIGS. 1 and 2, the metal ring 23 absorbs the thermal energy released from the spinning nozzle 2 and the spinning beam 1 into the free space 21 at the heating end 23.1 by convection and this heat. Energy is directed to the holding end 23.2 through the wall of the metal ring 23, from which heat energy is transferred to the inner wall 18 of the porous cylinder 17 by contact. In addition, further heating of the inner wall 18 of the porous cylinder 17 is achieved mainly by thermal radiation, via the heating collar end 23.3 which penetrates into the interior of the porous cylinder 17. Further, the inner contour of the metal ring 23 forms a cover of the yarn opening 20 formed on the upper side surface 11 of the blow box 8. In this case, the hopper-shaped configuration of the inner contour of the metal ring 23 is the porous cylinder 17. It favorably facilitates filament and gas entrainment into it.

  In order to improve the heat transfer to the metal ring 23 performed via the heating end 23.1, however, the heating end 23.1 is also brought into contact with one of the components of the spinning beam 1. It is also possible to hold it. To that end, another embodiment is shown in FIG. The embodiment shown in FIG. 3 is substantially the same as the embodiment shown in FIG. 1 and FIG. 2, so only the differences will be referred to here and the above description will be referred to for other points.

  In the embodiment shown in FIG. 3, the metal ring 23 is held at its holding end 23.2 in contact with the upper end of the porous cylinder 17. The heating collar 23.3 in the metal ring 23 is formed very short and serves only for centering at the inner diameter of the inner wall 18 of the porous cylinder 17.

  The heating end 23.1 of the metal ring 23 enters the free space 21. In this case, the heating end 23.1 has a plurality of heating ribs 23.4 that are uniformly distributed around the periphery, and these heating ribs 23.4 are arranged on the plate 14, 16 is in contact. This creates a thermal bridge that improves heat transfer to the heating end 23.1 of the metal ring 23, i.e. a heat transfer section.

  However, it should be noted in the embodiment shown in FIG. 3 that the thermal expansion occurring in the metal ring 23 does not cause stress in the metal ring 23 inside the free space 21. In order to ensure that the metal ring 23 is entrained when the height of the blow box 8 is adjusted, the metal ring 23 is preferably fixed to the upper side of the blow box 8. This is not shown in FIG.

  The embodiment shown in FIG. 4 is particularly suitable for spinning problematic materials with a high monomer and oligomer distribution. The embodiment shown in a cross-sectional view in FIG. 4 is almost the same as the embodiment shown in FIGS. 1 and 2 in terms of its structure and function, so only the differences will be described below, and other points will be described. Reference should be made to the above description.

  In the embodiment shown in FIG. 4, the blow box 8 is configured in the same manner as the embodiment shown in FIGS. 1 and 2 in the configuration of the upper blow chamber 9 and the lower blow chamber 10. Similarly, the metal ring 23 at the upper end of the porous cylinder 17 has the same configuration as that of the embodiment shown in FIGS. 1 and 2, and enters the free space 21 at its heating end 23.1. In this case, the temperature of the free space 21 is adjusted by the reheating device 30. For this purpose, the reheating device 30 is arranged below the spinning beam 1 between the spinning nozzle 2 and the porous cylinder 17. The reheating device 30 has a heating device (not shown here) in order to generate a temperature-adjusted zone immediately below the spinning nozzle 2. The reheating device 30 is held on the lower surface 12 of the spinning beam 1 by a pressing plate 14 in this embodiment, in which case the blow box 8 contacts the pressing plate 14 by a foam seal element 15 for sealing. ing. Since the reheating device 30 is formed in a cylindrical shape, the adjacent spinning nozzle has another reheating device. These reheating devices are preferably temperature controlled together.

  A steam supply device 31 is formed inside the spinning beam 1, and the steam supply device 31 is formed of a ring passage 32 and a supply pipe 33. The ring passage 32 has one or a plurality of blow openings 34, and these blow openings 34 open immediately below the spinning nozzle 2. During operation, water vapor is introduced via the supply line 33 and is distributed under the spinning nozzle 2 via the ring passage 32 and the blow opening 34. The water vapor flowing out on the lower side of the spinning nozzle 2 aggregates the gas generated when the filament is extruded. This can further reduce inconvenient deposits on adjacent members. In this case, the steam supply device 31 has a separate blow opening 34 for each spinning nozzle 2 held by the spinning nozzle 2.

  1-4, the separate heating means for heating the upper end of the porous cylinder 17 are formed as passive heating means, in which the spinning means The thermal energy generated around the nozzle 2 and the spinning beam 1 is used, whereby the entry area on the upper side of the porous cylinder 17 can be heated. However, basically, it is also possible to provide an active heating means for heating the porous cylinder 17 at the upper end. To that end, another embodiment is shown schematically in cross-section in FIG. The embodiment shown in FIG. 5 is the same as the already described embodiment with respect to the structure and function of the cooling device 4, and therefore only the differences will be described here in order to avoid repetition.

  In the embodiment shown in FIG. 5, a heating sleeve 22 is arranged at the upper end portion of the porous cylinder 17, and this heating sleeve 22 surrounds the outer wall 19. In this case, the heating sleeve 22 extends over a short region at the upper end of the porous cylinder 17, and no flow through takes place in this region. The heating sleeve 22 is actively heated, for example via a resistance heating element, whereby the upper end of the porous cylinder 17 can be heated. In this case, the heating sleeve 22 can be suitably connected to the energy supply part of the reheating device 30.

  Therefore, in the embodiment shown in FIG. 5, it is possible to preferably avoid the water vapor dragged together with the filament from condensing in the upper region of the porous cylinder 17. In this case, when the temperature of the porous cylinder 17 is adjusted, a temperature in the range exceeding 100 ° C. is suitably obtained. For example, when spinning polyamide PA6, the reheating device 30 is adjusted to a temperature of about 260 ° C.

  The embodiment shown in FIGS. 1 to 5 is an example of the structure and configuration of the cooling device. Basically, the upper blow chamber 9 is also provided with an air supply passage in direct correspondence so that the distribution of cooling air from the lower blow chamber to the upper blow chamber is omitted. It is also possible to form it integrally. What is important in this case is that the filament and gas entering the yarn opening directly impinge on the heated guide surface when entering the cooling device, based on the suction action that is generated, thereby The generation can be minimized. In this case, either passive heating means or active heating means are preferred for heating the run-in area of the porous cylinder.

DESCRIPTION OF SYMBOLS 1 Spinning beam 2 Spinning nozzle 3 Spinning pump 4 Cooling device 5 Melt supply path 6 Melt pipe line 7 Filament 8 Blow box 8.1 Top box 8.2 Bottom box 9 Upper blow chamber 10 Lower blow chamber 11 Blow Upper side of box 12 Lower side of spinning beam 13 Seal system 14 Press plate 15 Foam seal element 16 Insulating plate 17 Porous cylinder 18 Inner wall 19 Outer wall 20 Yarn opening 21 Free space 22 Heating sleeve 23 Metal ring 23.1 Heating end 23 .2 Holding end 23.3 Heating collar 23.4 Heating rib 24 Air supply passage 25 Tube piece 26 Plate with hole 27.1, 27.2 Lifting cylinder 28 Outflow opening 29 Air supply part 30 Reheating device 31 Steam supply device 32 Ring passage 33 Supply pipe 34 Over the opening

Claims (10)

A device for melt spinning and cooling synthetic filaments, comprising a heated spinning beam (1) having at least one spinning nozzle (2) for extruding said filaments on the underside, and a spinning beam (1) A cooling device (4) arranged below, the cooling device (4) comprising a blow chamber (9) and a gas permeable wall arranged inside the blow chamber (9). A porous cylinder (17), the upper end of the porous cylinder (17) being arranged under the spinning nozzle (2) to receive the filament at a distance; In the device
Separate heating means (22, 23) are in contact with the upper end of the porous cylinder (17), and the upper end of the porous cylinder (17) is brought into contact with the heating means (22, 23). An apparatus for melt spinning and cooling synthetic filaments, characterized by being heatable.   The heating means is formed by a heating sleeve (22), the heating sleeve (22) being arranged around the outer wall (19) or inner wall (18) of the porous cylinder (17). Item 1. The apparatus according to Item 1. The heating means is formed by a heat conductive metal ring (23), the metal ring (23) is held in contact with the upper end of the porous cylinder (17), and is free. 2. The device according to claim 1, wherein the heating end (23.1) enters a free space (21) formed between the porous cylinder (17) and the spinning nozzle ( 2 ). .   The heating end (23.1) of the metal ring (23) is in the free space (21) so as to contact the heat passing member of the spinning beam (1) or without cantilever contact. 4. The device of claim 3, wherein the device is held.   The metal ring (23) has a cylindrical heating collar (23.3) at the holding end, and the heating collar (23.3) enters the porous cylinder (17). An apparatus according to claim 3 or 4.   Device according to claim 5, wherein the metal ring (23) is held without contact with the cylindrical heating collar (23.3) against the inner wall (18) of the porous cylinder (17). .   The device according to any one of claims 3 to 6, wherein the metal ring (23) is mounted exchangeably on the upper end of the porous cylinder (17).   A reheating device (30) is disposed between the spinning nozzle (2) and the upper end of the porous cylinder (17), and the reheating device (30) causes the spinning nozzle (2) to 8. The device according to claim 1, wherein a temperature-controlled free space (21) is formed between the cylinder and the porous cylinder (17).   The device according to claim 8, wherein the heating end (23.1) of the metal ring (23) enters the temperature-controlled free space (21).   A steam supply device (31) is provided corresponding to the spinning nozzle (2), and steam can be introduced into the free space under the spinning nozzle (2) by the steam supply device (31). 10. The device according to any one of claims 1 to 9, wherein:

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