JP6605479B2 - Spinning nozzle device - Google Patents

Description

  The present invention relates to a spinning nozzle device for melt-spinning a large number of filaments from a polymer melt according to the first stage of claim 1.

  In order to produce synthetic yarn in the melt spinning process, a spinning nozzle device is usually used, and this spinning nozzle device spins a plurality of extremely thin filaments from a melt stream supplied with a polymer. In order to obtain a high uniformity during spinning of the filament strands, it is very important that the polymer melt has a high purity and a uniform homogeneity. Therefore, such spinning nozzle devices usually have at least one filter element. However, at this time it is necessary to perform not only filtration but also pressure drop and shearing before spinning and mixing of the polymer melt in order to ensure not only cleanness but also homogeneity.

  In order to satisfy such a demand, German Patent Application No. 10140116 proposes a spinning nozzle device having a filter device having a plurality of ring filter elements. These ring filter elements are arranged one after the other in series arrangement, so that overall a good depth effect (Tiefenwirkung) and a significantly large filtration area are produced. However, such ring filter elements basically have the disadvantage that the polymer melt is only poorly mixed when penetrating the ring filter element. In particular, unavoidable stitches in the ring filter element appear to be particularly problematic.

  In order to achieve sufficient mixing of the polymer melt, only one ring filter element is used in the spinning nozzle device known from DE 42225341, which ring filter element is Cooperates with the mixing device inside the housing. At this time, the mixing device is arranged inside the ring-shaped filter element, so that only a limited filter depth can be used for filtering the polymer melt.

  Furthermore, in a spinning nozzle device known from US Pat. No. 3,847,524, a plurality of candle-shaped filter elements work together with one shear plate. The melt is then sheared and mixed by additional shearing means just before the nozzle plate. With such a filter device, it is almost impossible to obtain an even flow in all filter candles. The inevitably uneven flow in the filter candle will result in a further variety of dirt, which further promotes the uneven flow.

  Therefore, the object of the present invention is to improve the spinning nozzle apparatus for melt-spinning a large number of filaments from a polymer melt as described in the first part of claim 1 so as to increase the filtration, shearing and mixing of the melt before spinning. It is to be able to carry out with equality.

  Another object of the present invention is to improve a spinning nozzle device of the type described in the first part of claim 1 so that the filter device has a high flexibility for regulating the filtration, shearing and mixing of the polymer melt. It is configured to have.

  In order to solve this problem, in the configuration of the present invention, the first filter element arranged corresponding to the melt inlet is formed by a ring-shaped candle filter and is arranged in front of the nozzle opening of the nozzle plate. The filter element is formed by a sand filter.

  Preferred embodiments of the invention are defined by the features and combinations of features of the dependent claims.

  The invention stands out because the function for the preparation of the polymer melt before spinning can be performed by a separate filter element. For example, the filtering function and the shearing function can be performed by different filter materials. In particular, the first filter element formed as a ring-shaped candle filter can achieve filtration with a relatively long filtration life with a relatively large filtration area. A sand filter located behind the ring-shaped candle filter, i.e. downstream, offers the special advantage of mixing and shearing the polymer melt with or without additional filtration. To do. This allows the polymer melt to be homogenized at a high level before being spun through the nozzle openings of the nozzle plate.

  In order to allow the melt to be filtered multiple times, in another preferred aspect of the invention, the candle filter has a greater filtration accuracy than that of the sand filter. If comprised in this way, powerful prefiltration can be implement | achieved with a ring-shaped candle filter. In particular, a sand filter suitable for its depth effect is then used to ensure microfiltration.

  However, basically, it is also possible for the candle filter to have a smaller filtration accuracy than that of the sand filter. In this variant of the invention, the polymer melt is filtered only by a ring-shaped candle filter. The subsequent sand filter is preferably used mainly only for the mixing and shearing of the polymer melt, so that, for example, a defined temperature level can be obtained inside the melt.

  In connection with yarn count and polymer type, the candle filter is preferably formed with a filtration accuracy in the range of 5 μm to 200 μm. Thereby, all combinations for adjusting single or double filtration and for adjusting the desired shear and mixing can be realized.

  In order to achieve a large filter area on the one hand and, on the other hand, to achieve a sufficient depth effect during the filtration of the polymer melt, in another preferred embodiment of the invention, the candle filter is arranged at the periphery, preferably in a multilayer. And a pleated filter material made of a special steel wire woven fabric. If comprised in this way, the extremely long service life of a candle filter and the high purity of a melt can be obtained.

  In another preferred embodiment of the present invention that facilitates radial flow of the candle filter, the candle filter is disposed within the housing between the outer retaining ring and the inner displacement member, The candle filter has a support tube for the displaced body and forms a collecting chamber. If comprised in this way, the flow which penetrates the surrounding wall of a candle filter toward inner side from the radial direction outer side is realizable.

  The supply of polymer melt is then preferably promoted by a displacement head displacement head formed on the upper side of the candle filter which forms an inlet chamber together with the inlet plate.

  In order to accommodate the sand filter, in another aspect of the invention, the sand filter is formed by a sand deposit, preferably made of quartz sand or metal powder, in the recess of the filter plate, the filter plate comprising: It is held on the nozzle plate in the housing.

  At this time, the filter plate has a plurality of holes at the bottom of the recess, and these holes are covered with the supporting woven fabric against the sand deposit. If comprised in this way, the uniform flow of a sand filter will be attained. In particular, in a preferred embodiment that further improves the present invention to obtain a specific pressure condition for spinning the polymer melt at the nozzle openings of the nozzle plate, the pressure drop plate is between the sand filter and the nozzle plate. Arranged, the pressure drop plate has at least one through hole. Due to the number and shape of the through holes in the pressure drop plate, the melt distribution can also be realized directly in the valve chamber in front of the nozzle plate.

  The spinning nozzle device according to the present invention is basically suitable for spinning all general-purpose polymer types for fiber production. At this time, the nozzle openings in the nozzle plate may be formed in an arrangement form of a surface shape or a ring shape.

  Next, the spinning nozzle device according to the present invention will be described in detail with reference to the drawings.

It is sectional drawing which shows 1st Embodiment of the spinning nozzle apparatus which concerns on this invention. It is sectional drawing which shows another embodiment of the spinning nozzle apparatus which concerns on this invention.

  FIG. 1 schematically shows, in cross-section, a first embodiment of a spinning nozzle device according to the invention for melt spinning many filaments from a polymer melt. The spinning nozzle device has a hollow cylindrical housing 1, which has a fixed thread 21 at the open end.

  The housing 1 is closed at its opposite end by a nozzle plate 2. The nozzle plate 2 has a plurality of nozzle openings 3, which penetrate completely through the nozzle plate 2, preferably at a plurality of diameter steps, i.e. stepped diameter portions.

  Inside the housing 1, a filter plate 16 that accommodates the filter device 4 and a holding ring 7 are supported by the nozzle plate 2. The filter device 4 is disposed between the inlet adapter 5 and the nozzle plate 2 inside the housing 1. The inlet adapter 5 in the upper region of the housing 1 has a melt inlet 6, which melt inlet 6 passes completely through the inlet adapter 5.

  The filter device 4 has a plurality of filter elements 4.1 and 4.2, and these filter elements 4.1 and 4.2 are arranged one after the other inside the housing 1. The first filter element arranged corresponding to the melt inlet 6 is formed as a candle filter 4.1. This candle filter 4.1 is formed in a ring shape and is supported by the holding collar 22 of the holding ring 7 at its lower end. The candle filter 4.1 therefore has an inner support tube 12 which is surrounded by a pleated filter material 11.

  The upper end of the ring-shaped candle filter 4.1 is held by a displacement body 8, which is formed in a conical shape inside the candle filter 4.1, A collecting chamber 14 extending between the displacement member 8 and the pushing-out body 8 is formed. In the upper region, the displacement body 8 has a displacement head 9 which seals the upper end of the ring-shaped candle filter 4.1.

  A spring-elastic spacer 10 is arranged between the push-out head 9 and the inlet adapter 5, and thereby a free space is created between the inlet adapter 5 and the push-out body 8. Similarly, another free space is formed between the holding ring 7 and the candle filter 4.1. The free space formed between the melt inlet 6 and the candle filter 4.1 is referred to herein as the inlet chamber 13. At this time, the distribution of the polymer melt supplied through the melt inlet 6 into the inlet chamber 13 is determined mainly by the displacement head 9.

  A filter plate 16 is arranged under the holding ring 7, and this filter plate 16 has a circular recess 17, and the diameter of this recess 17 is larger than the outer diameter of the candle filter 4.1. In the recess 17, a sandufschuettung 18 of the sand filter 4.2 is accommodated. The sand deposit 18 may at this time be formed from quartz sand or alternatively from metal powder. The sand filter 4.2 has a supporting woven fabric 19 at the bottom of the recess 17, and the supporting woven fabric 19 covers many holes 20 in the bottom of the recess 17 of the filter plate 16. The hole 20 on the lower side of the filter plate 16 opens into a distribution chamber 15 formed between the filter plate 16 and the nozzle plate 2.

  On the upper side of the filter plate 16, a collecting chamber 14 is formed between the displacement member 8 and the sand filter 4.2, and this collecting chamber 14 extends to the upper end of the candle filter 4.1 in the axial direction. It extends.

  During operation, the spinning nozzle device is fixed to the spinning nozzle accommodating part via the fixing screw thread 21, and at this time, the inlet adapter 5 is connected to the melt supply device in a compact manner. In this state, the polymer melt is introduced into the melt inlet 6 under the pre-set pressure of the spinning pump and first led into the inlet chamber 13. The polymer melt flows through the candle filter 4.1 in the radial direction from outside to inside. At this time, the melt is filtered. For this purpose, the filter medium 11 of the candle filter 4.1 is preferably formed from a woven pleated special steel wire fabric.

  After the filtration, the melt reaches the collecting chamber 14 and then passes through the sand filter 4.2. Within the sand filter 4.2, the polymer melt is mixed and sheared. Thereafter, the polymer melt reaches the distribution chamber 15 through the holes 20. The polymer melt is then spun through the nozzle opening 3.

  The sand deposit 18 of the sand filter 4.2 is preferably formed from quartz sand or metal powder. Depending on the filter accuracy of the candle filter 4.1, a wide variety of sand deposits 18 can be selected at this time.

  For example, the filter medium 11 of the candle filter 4.1 can have a finer filtration accuracy than the sand deposit 18 of the sand filter 4.2. When configured in this way, the filtration is carried out substantially by the candle filter 4.1. The sand filter 4.2 is designed to perform the function of shearing and mixing the polymer melt. However, alternatively, it is also possible to select the filtration accuracy of the candle filter 4.1 coarser than the filtration accuracy of the sand filter 4.2. If comprised in this way, the two-stage filtration performed by the candle filter 4.1 and the sand filter 4.2 will be implemented.

  The filter medium 11 of the candle filter 4.1 is preferably configured with a filtration accuracy in the range of 5 μm to a maximum of 200 μm, so that textile yarns and technical yarns can be spun in relation to the yarn count.

  For spinning polymer melts, a preset pressure drop and temperature increase are desired, especially in the interior of the spinning nozzle device, in order to obtain good spinnability. In order to be able to realize an additional pressure drop independent of the filter device, FIG. 2 shows another embodiment of a spinning nozzle device according to the present invention.

  FIG. 2 schematically shows a cross-sectional view of another embodiment of the spinning nozzle device according to the invention. The embodiment of the spinning nozzle device shown in FIG. 2 is substantially the same as the embodiment shown in FIG. 1, so that only the differences will be described below and the above description will be referred to for other points. To do.

  In order to improve the pressure drop and to mix the polymer melt, an additional pressure drop plate 23 is arranged between the filter plate 16 and the nozzle plate 2 in the embodiment shown in FIG. The pressure drop plate 23 has a through hole 24. Since the pressure drop plate 23 is formed with a conical recess 25 on the upper side, the melt flowing out from the hole 20 of the filter plate 16 is evenly guided toward the through hole 24. A distribution chamber 15 is formed below the pressure drop plate 23, and this distribution chamber 15 extends over the entire nozzle opening 3.

  Such a pressure drop plate 23 is also referred to as a Shirley-Plate in the industry. At this time, the pressure drop plate 23 may have a plurality of through holes 24.

  With the additional pressure drop plate 23, further pressure drops in the range up to 150 bar and additional temperature increases in the range up to 10 Kelvin can be achieved.

  The structure of the spinning nozzle device shown in FIGS. 1 and 2 is an example. Basically, it is possible to form the spinning nozzle device in a plate-shaped arrangement, and at this time, a plurality of plates are connected in a compact manner. For example, a square nozzle plate can be realized. The present invention is not limited to the round shape of the spinning nozzle device.

Claims (12)

A spinning nozzle device for melt spinning a filament from a polymer melt, comprising a nozzle plate (2) with a number of nozzle openings (3) and an inlet adapter with at least one melt inlet (6) 5) and a plurality of filter elements (4.1, 4.2) arranged between the inlet adapter (5) and the nozzle plate (2) and arranged one after the other. In a spinning nozzle device, provided with a housing (1) for housing the device (4),
A first filter element arranged corresponding to the melt inlet (6) is formed by a ring-shaped candle filter (4.1) and arranged in front of the nozzle opening (3) of the nozzle plate (2). A spinning nozzle device, characterized in that the further filter element formed is formed by a sand filter (4.2).   The spinning nozzle device according to claim 1, wherein the candle filter (4.1) has a filtration accuracy greater than that of the sand filter (4.2).   The spinning nozzle device according to claim 1, wherein the candle filter (4.1) has a filtration accuracy smaller than that of the sand filter (4.2).   The spinning nozzle device according to any one of claims 1 to 3, wherein a filtration accuracy of the candle filter (4.1) is in a range of 5 µm to 200 µm. The candle filter (4.1) is provided around and has a flop Lietz processed filter material (11), spinning nozzle device according to any one of claims 1 to 4. 6. Spinning nozzle device according to claim 5, wherein the pleated filter material (11) comprises a multi-layer special steel wire woven fabric. The candle filter (4.1) is disposed between the outer retaining ring (7) and the inner displacement body (8) inside the housing (1). At this time, the candle filter (4) The spinning nozzle device according to claim 5 or 6 , wherein .1) has a support tube (12) with respect to the displacement body (8) and forms a collecting chamber (14). The displacement body (8) has a displacement head (9) formed above the candle filter (4.1), and the displacement head (9) is connected to the inlet adapter (5). The spinning nozzle device according to claim 7 , wherein an inlet chamber (13) is formed together. The sand filter (4.2) is constituted by sand deposits (18) in the recesses (17) of the filter plate (16), and the filter plate (16) is formed in the housing (1). The spinning nozzle device according to any one of claims 1 to 8 , wherein the spinning nozzle device is held on the nozzle plate (2). The spinning nozzle device according to claim 9, wherein the sand deposit (18) is made of quartz sand or metal powder. The filter plate (16) has a plurality of holes (20) at the bottom of the recess (17), and the holes (20) support the woven fabric (19) with respect to the sand deposit (18). The spinning nozzle device according to claim 9 or 10 , which is covered by A pressure drop plate (23) is disposed between the sand filter (4.2) and the nozzle plate (2), and the pressure drop plate (23) has at least one through hole (24). The spinning nozzle device according to any one of claims 1 to 11 , further comprising:

Images