US20030035855A1 - Spinning apparatus - Google Patents
Spinning apparatus Download PDFInfo
- Publication number
- US20030035855A1 US20030035855A1 US10/213,806 US21380602A US2003035855A1 US 20030035855 A1 US20030035855 A1 US 20030035855A1 US 21380602 A US21380602 A US 21380602A US 2003035855 A1 US2003035855 A1 US 2003035855A1
- Authority
- US
- United States
- Prior art keywords
- filter
- melt
- spinning apparatus
- annular
- spinneret
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/06—Distributing spinning solution or melt to spinning nozzles
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/10—Filtering or de-aerating the spinning solution or melt
- D01D1/106—Filtering
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D4/00—Spinnerette packs; Cleaning thereof
Abstract
A spinning apparatus for extruding a group of filaments by means of an annular spinneret. An annular collection chamber is arranged upstream of the spinneret, which is provided with a plurality of nozzle bores. The collection chamber has an upper inlet area and a lower annular outlet area, which is connected to the upper inlet area. In the inlet area of the collection chamber a filter device is disposed, upstream of which is a melt feed. The inlet area of the collection chamber is formed by a plurality of filter chambers, which are each provided with a melt inlet and a melt outlet. The filter device has a plurality of substantially cylindrical filter elements, which are each provided with a powdered filter medium. One of these filter elements is assigned to each filter chamber. This ensures a large filtration area and deep bed filtration of the polymer melt.
Description
- The invention relates to a spinning apparatus for extruding a group of filaments comprising an annular spinneret.
- An example of a spinning apparatus is disclosed in U.S. Pat. No. 6,171,536.
- This prior art spinning apparatus has an annular spinneret on an underside with a plurality of nozzle bores through which a polymer melt is extruded into strand-like filaments. Such spinning apparatus' are used in staple fiber plants. The group of filaments is combined into a filament bundle after cooling. To enable uniform extrusion of the polymer melt, the polymer melt is filtered immediately prior to extrusion to ensure its purity and homogeneity. For this purpose, the prior art spinning apparatus comprises an annular collection chamber with an outlet area directly in front of the spinneret and an upper inlet area. In the inlet area, a filter device is arranged comprising an annular filter element with an approximately U-shaped cross section. For this purpose, an outer and an inner screen wall are joined at one end and inserted into the annular inlet area of the collection chamber. The opposite ends of the screen walls form the melt inlet of the collection chamber.
- Although the filter device used in the prior art spinning apparatus permits an enlargement of the filtration area, it has the significant drawback that no deep action can be achieved by means of the screen wall. The result is a shorter tool life and decreasing throughputs due to the increasing degree of contamination.
- Another drawback of the prior-art spinning apparatus is that the high melt pressure requires correspondingly strong side walls of the collection chamber to realize the nozzle diameter.
- European Application 0 178 570 A1 discloses a spinning apparatus in which a plurality of filter candles are used to filter a polymer melt prior to extrusion through a spinneret. The drawbacks of this apparatus are that the spinning apparatus is completely unsuitable for extruding an annular group of filaments required for staple fiber production and the deep action of the filter candles is insufficient.
- Accordingly, there is a need in the art for a spinning apparatus for extruding a group of filaments with an annular spinneret in such a way that prior to extrusion the polymer melt is filtered under the action of large filtration areas and deep bed filtration.
- The present invention fulfills this need by providing a spinning apparatus wherein the inlet area of the collection chamber is formed by a plurality of filter chambers, each provided with a melt inlet and a melt outlet, and the filter device has a plurality of substantially cylindrical filter elements, each provided with a powdered filter medium. One filter element is assigned to each filter chamber.
- The present invention is based on substantially cylindrical filter elements, each of which is provided with a powdered filter medium in order to obtain sufficient deep bed filtration. Furthermore, the pressure load in the filter chambers is very small due to the relatively small diameters of the filter chambers in the region of the filter device.
- A particularly advantageous further development of the invention provides that the filter elements are each formed as hollow cylinders with an outlet opening that communicates with the melt outlet of the filter chamber. The filter elements each have a filter shell made of the powdered filter medium through which the molten material flows from the outside toward the inside. A space is formed between the filter shell of the filter element and the filter chamber. This ensures a uniform inflow of the polymer melt over the circumference of the filter element. Due to the hollow cylindrical configuration of the filter element, the paths traveled by the polymer melt within the filter element are equally long in radial direction irrespective of the entry of the polymer melt. This has the advantage that equal retention times are obtained.
- A particularly simple and effective construction of the filter element of the present invention is also provided. The filter shell is formed by an inner tube that is open toward the outlet opening and an outer tube that encloses the inner tube. A closed annular shell casing is arranged between the inner tube and the outer tube to receive the powdered filter medium. In the inner tube and the outer tube, a plurality of passages is provided to allow the polymer melt to enter and exit. An additional screen cover may be arranged along the circumference of the inner tube and/or the outer tube.
- The filter medium is preferably formed by a metal powder or a sand, e.g. a silica sand.
- In principle, however, the shell casing formed between the inner tube and the outer tube can be filled with any type of filter medium.
- To obtain a uniform melt feed of the filtered melt over the entire annular cross section of the spinneret, the filter chambers are arranged annularly spaced apart from one another such that the melt outlets of the filter chambers open directly into the outlet area of the collection chamber.
- The melt feed can advantageously be connected with the melt inlets of the filter chambers by a plurality of distribution channels, or it can be connected with the melt inlets of the filter chambers by an annular distribution channel. It is essential that between the melt feed and the melt inlets of the filter chambers, paths of equal length are formed by the distribution channels to avoid different retention times of the polymer melt within the spinning apparatus.
- In a particularly advantageous further development of the invention an annular perforated plate is arranged in the outlet area of the collection chamber upstream of the spinneret to achieve better mixing of the melt streams exiting from the melt outlets of the filter chambers in the outlet area of the collection chamber.
- To supply a cooling air stream required to cool the group of filaments, the spinneret and the filter device are held by an annular carrier. The melt-carrying parts of the spinning apparatus are heated by a heating element arranged on the inside of the carrier. The heating elements used for this purpose are preferably electric heater bands.
- The remaining areas of the carrier can advantageously be heated by means of a heat transfer fluid. The shell of the carrier and the end face of the carrier are connected with a heating box that contains the heat transfer fluid.
- An exemplary embodiment of the inventive spinning apparatus will now be described in greater detail with reference to the attached drawings in which:
- FIG. 1.1 is a schematic sectional view taken in longitudinal direction of the spinning apparatus according to a first embodiment of the present invention;
- FIG. 1.2 is a schematic cross section of the spinning apparatus according to the first embodiment of the present invention;
- FIG. 1.3 depicts an enlarged detail of the sectional view of FIG. 1.1.
- FIG. 2 is a schematic sectional view of a second embodiment of the spinning apparatus according to the present invention.
- Unless express reference is made to one of the figures, the following description applies to all of the figures.
- The spinning apparatus of the present invention comprises a heated
carrier 17. The heating elements required to heatcarrier 17 are not depicted.Carrier 17 serves to receive anannular spinneret 1, which is mounted to the underside ofcarrier 17. Spinneret 1 has a plurality ofnozzle bores 5. Above spinneret 1, an annular collection chamber is formed, which comprises a lower annular outlet area 2.2 and an upper inlet area 2.1. The outlet area 2.2 of the collection chamber is annular and covers the entire surface ofspinneret 1. Within the outlet area 2.2, aperforated plate 16 and anintermediate plate 29 are arranged.Perforated plate 16 comprises a plurality ofvertical bores 32 through which anannular chamber 33 formed between spinneret 1 andperforated plate 16 is connected with the remaining sections of outlet area 2.2 of the collection chamber. Theintermediate plate 29 forms the connection between the inlet area 2.1 and the outlet area 2.2 of the collection chamber. - The inlet area2.1 of the collection chamber is formed by a plurality of
filter chambers 3 that are spaced apart from one another. In a preferred embodiment, a total of elevenfilter chambers 3 are introduced intocarrier 17 so as to be uniformly distributed over the annual cross section of outlet area 2.2. The number offilter chambers 3 is given by way of example.Filter chambers 3 each have anupper melt inlet 7 and alower melt outlet 8.Melt outlets 8 offilter chambers 3 are formed in accordance with the partitioning of the filter chamber arrangement in theintermediate plate 29. - The inlet area2.1 of the collection chamber serves to receive a filter device. The filter device comprises a plurality of
filter elements 4, each of which are arranged in afilter chamber 3.Filter elements 4, of which there is a total of eleven in a preferred embodiment, are hollow and cylindrical and have apermeable filter shell 11. The diameter offilter shell 11 is selected in such a way that a gap is formed between the wall offilter chamber 3 andfilter element 4. -
Filter element 4 has aninner tube 12, which is closed at one end and open at the opposite end. The open end of theinner tube 12 forms the outlet opening 10 of the filter element, which is connected with themelt outlet 8 offilter chamber 3. Along the circumference of theinner tube 12, at its open end, acircumferential collar 31 is formed, which in axial direction rests againstintermediate plate 29 and in radial direction againstcarrier 17 forming a seal. On the side ofcollar 31 oppositeintermediate plate 29, anouter tube 13 rests againstcollar 31. Thisouter tube 13 encloses theinner tube 12 at a distance and extends up to the closed end ofinner tube 12. At the closed end of inner tube 12 acover 24 is provided which connects theinner tube 12 with theouter tube 13. This creates a closed annular shell casing into which apowdered filter medium 9 is introduced.Outer tube 13,inner tube 12 and cover 24 have a plurality ofpassages 14.Filter element 4 is inserted upright infilter chamber 3.Collar 31 forms a partition infilter chamber 3 betweenmelt inlet 7 and meltoutlet 8. - The
filter elements 4 of the filter device are preferably configured identically to achieve uniform filtration of the melt. - The
melt inlets 7 offilter chambers 3 are connected with amelt feed 6. For this purpose, a distribution line system is provided, assigning aseparate distribution line 15 to eachindividual filter chamber 3. This distribution line system is supplied by aspin pump 21.Spin pump 21 is connected with a melt generator, e.g. an extruder. - In the embodiment of the spinning apparatus shown in FIG. 1, a polymer melt stream is supplied by
spin pump 21 to distribution lines 15.Distribution lines 15 each feed a partial melt stream to one of themelt inlets 7. Thus, a partial polymer melt stream enters into each of thefilter chambers 3. Infilter chamber 3, the polymer melt is distributed over the entire circumference offilter shell 11 and penetrates throughpassages 14 ofouter tube 13 intofilter shell 11. The polymer melt passes through thepowdered filter medium 9 and viapassages 14 ofinner tube 12 is guided into acentral melt channel 30. From thiscentral melt channel 30 the partial stream reaches meltoutlet 8 offilter chamber 3 viaoutlet opening 10. Frommelt outlet 8 the partial melt stream passes into outlet area 2.2 of the collection chamber. All the partial streams flowing throughfilter chambers 3 are combined in outlet area 2.2. The polymer melt is then guided throughbores 32 ofperforated plate 16, such that additional mixing takes place inannular chamber 33 betweenperforated plate 16 andspinneret 1. The polymer melt is then extruded through nozzle bores 5 ofspinneret 1. A group of filaments is created resulting in a closed filament curtain corresponding to the annular arrangement of the spinneret. - To filter the polymer melt,
filter elements 4 preferably contain metal powder or a silica sand infilter shell 11. This ensures deep action during filtration of the polymer melt. In addition,filter shell 11 is constructed and integrated infilter chamber 3 in such a way that the retention times of the polymer melt during filtration are substantially independent of the entry location. Furthermore, relatively high differential pressures can be realized during filtering of the polymer melt. The pressure load is limited to the diameter offilter chambers 3, which is small compared to that of the spinneret. - The construction of the filter element in the embodiment shown in FIG. 1 is only an example. It is possible, for instance, to arrange additional filter screens in the inner and outer region of the tubes. It is also possible to use any type of filter medium in the shell casing.
- FIG. 2 depicts a further embodiment of the inventive spinning apparatus. Components with like function are provided with identical reference numerals. The construction of the embodiment according to FIG. 2 is substantially identical to that of the preceding embodiment, so that only the significant differences will be described below.
- The embodiment of the spinning apparatus according to FIG. 2 has an
annular carrier 17. Thisannular carrier 17 is integrated in aheating box 20 such thatshell 27 ofcarrier 17 and the upper end face 28 ofcarrier 17 can be heated by a heat transfer medium contained inheating box 20. In its center,carrier 17 forms aseat 34 for a cooling device (not depicted). On the inside 18 ofcarrier 17, aheating element 19 is arranged.Heating element 19 is preferably embodied as a heater band, which heats theentire interior 18 ofcarrier 17. -
Carrier 17 serves to hold aspinneret 1, aperforated plate 16, anintermediate plate 29 and a plurality offilter elements 4. The arrangement and configuration ofspinneret 1, perforatedplate 16,intermediate plate 29 andfilter elements 4 is identical to the embodiment shown in FIG. 1, so that reference is made to the preceding description. -
Melt inlets 7 offilter chambers 3 are connected with anannular distribution channel 22.Distribution channel 22 is connected with aspin pump 21 and amelt feed 6 via one or more melt lines 23.Distribution channel 22,melt lines 23 and spin pump 21 are arranged inheating box 20 and are heated. - In contrast to the preceding embodiment of the spinning apparatus, a polymer melt is first conveyed into the
annular distribution channel 22 viaspin pump 21. Fromdistribution channel 22 the polymer melt enters into the associatedfilter chambers 3 in respective partial streams. After filtering, the partial streams are combined again and mixed in the outlet area of collection chamber 2.2. After passing throughperforated plate 16, the polymer melt is extruded by means ofspinneret 1 to form the plurality of filaments. -
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Claims (11)
1. Spinning apparatus for extruding a group of filaments comprising:
an annular spinneret comprising a plurality of nozzle bores;
an annular collection chamber arranged upstream of the spinneret comprising:
an upper inlet area; and
a lower annular outlet area connected to the upper inlet area;
a filter device arranged in the inlet area of the collection chamber; and
a melt feed arranged upstream of the filter device;
wherein the inlet area of the collection chamber is formed by a plurality of filter chambers each having a melt inlet and a melt outlet;
wherein the filter device comprises a plurality of substantially cylindrical filter elements which each comprise a powdered filter medium; and
wherein each one of the filter elements is assigned to one of the filter chambers.
2. Spinning apparatus as claimed in claim 1:
wherein the filter elements are each formed as a hollow cylinder with an outlet opening that is connected to the melt outlet of the filter chamber;
wherein the filter elements each have a filter shell comprising the powdered filter medium through which melt flows from the outside toward the inside; and
wherein a space is formed between the filter shell of the filter element and the filter chamber.
3. Spinning apparatus as claimed in claim 2:
wherein the filter shell is formed by an inner tube that is open toward the outlet opening and an outer tube that encloses the inner tube;
wherein a closed shell casing exists between the inner tube and the outer tube to receive the powdered filter medium; and
wherein the inner tube and the outer tube each have a plurality of passages.
4. Spinning apparatus as claimed in claim 1 , wherein the powdered filter material is a sand or a metal powder.
5. Spinning apparatus as claimed in claim 1 , wherein the filter chambers are annularly spaced apart from one another within the inlet area and wherein the melt outlets of the filter chambers open directly into the outlet area of the collection chamber.
6. Spinning apparatus as claimed in claim 1 , wherein the melt inlets of the filter chambers are connected to the melt feed by a plurality of distribution lines.
7. Spinning apparatus as claimed in claim 1 , wherein the melt inlets of the filter chambers are connected to the melt feed by an annular distribution channel.
8. Spinning apparatus as claimed in claim 1 , wherein an annular perforated plate is arranged upstream of the spinneret within the outlet area.
9. Spinning apparatus as claimed in claim 1 , wherein the spinneret and the filter device are held by an annular carrier and wherein a heating element is arranged on the inside of the carrier.
10. Spinning apparatus as claimed in claim 9 , wherein the heating element is an electric heater band.
11. Spinning apparatus as claimed in claim 9 , wherein the carrier is connected to a heating box such that a shell of the carrier and an upper end face of the carrier can be heated by a heat transfer fluid.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10140581A DE10140581A1 (en) | 2001-08-18 | 2001-08-18 | spinning device |
DE10140581.2 | 2001-08-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030035855A1 true US20030035855A1 (en) | 2003-02-20 |
Family
ID=7695888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/213,806 Abandoned US20030035855A1 (en) | 2001-08-18 | 2002-08-06 | Spinning apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US20030035855A1 (en) |
EP (1) | EP1285981A1 (en) |
CN (1) | CN1407144A (en) |
DE (1) | DE10140581A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005045104A1 (en) * | 2003-10-21 | 2005-05-19 | Saurer Gmbh & Co. Kg | Spinning head and filter device for said type of spinning head |
CN108411387A (en) * | 2018-04-20 | 2018-08-17 | 中国纺织科学研究院有限公司 | Melt spinning apparatus |
CN115418729A (en) * | 2022-08-01 | 2022-12-02 | 浙江理工大学 | Melt filtering device for preparing colored superfine washing cotton composite fiber |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101845674B (en) * | 2010-06-07 | 2011-09-28 | 扬州华美丙纶纺织有限公司 | Two-layer circular air blow fiber spinning jet |
CN103320873A (en) * | 2013-07-02 | 2013-09-25 | 昆明醋酸纤维有限公司 | Method and device for filtering precision-cutting size for cellulose-acetate fiber spinning |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3071808A (en) * | 1960-06-11 | 1963-01-08 | British Nylon Spinners Ltd | Melt-spinning synthetic polymer filaments |
US3758658A (en) * | 1969-12-22 | 1973-09-11 | Vickers Zimmer Ag | Ecular weight linear polymers process for the production of technical endless filaments of high mol |
US4088431A (en) * | 1974-05-07 | 1978-05-09 | Imperial Chemical Industries Limited | Melt spinning filter |
US4276011A (en) * | 1979-02-21 | 1981-06-30 | American Cyanamid Company | Spinnerette assembly |
US4494921A (en) * | 1983-08-08 | 1985-01-22 | E. I. Du Pont De Nemours And Company | Filter element |
US4512731A (en) * | 1981-07-09 | 1985-04-23 | Celanese Corporation | Apparatus and process for filtering molten polymer |
US4704077A (en) * | 1984-10-16 | 1987-11-03 | Barmag Ag | Melt spinning apparatus |
US5462653A (en) * | 1994-02-15 | 1995-10-31 | Hills, Inc. | Apparatus for continuous polymer filtration |
US5484539A (en) * | 1993-11-08 | 1996-01-16 | Zimmer Aktiengesellschaft | Process for filtering polymer melts with dead spot reduction |
US5486105A (en) * | 1992-12-14 | 1996-01-23 | Toshiba Kikai Kabushiki Kaisha | Apparatus for controlling a heating temperature |
US6171536B1 (en) * | 1998-04-10 | 2001-01-09 | Arteva North America S.A.R.L. | Apparatus and method for melt spinning of molten polymeric material |
-
2001
- 2001-08-18 DE DE10140581A patent/DE10140581A1/en not_active Withdrawn
-
2002
- 2002-07-18 EP EP02015685A patent/EP1285981A1/en not_active Withdrawn
- 2002-07-31 CN CN02125287.4A patent/CN1407144A/en active Pending
- 2002-08-06 US US10/213,806 patent/US20030035855A1/en not_active Abandoned
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3071808A (en) * | 1960-06-11 | 1963-01-08 | British Nylon Spinners Ltd | Melt-spinning synthetic polymer filaments |
US3758658A (en) * | 1969-12-22 | 1973-09-11 | Vickers Zimmer Ag | Ecular weight linear polymers process for the production of technical endless filaments of high mol |
US4088431A (en) * | 1974-05-07 | 1978-05-09 | Imperial Chemical Industries Limited | Melt spinning filter |
US4276011A (en) * | 1979-02-21 | 1981-06-30 | American Cyanamid Company | Spinnerette assembly |
US4512731A (en) * | 1981-07-09 | 1985-04-23 | Celanese Corporation | Apparatus and process for filtering molten polymer |
US4494921A (en) * | 1983-08-08 | 1985-01-22 | E. I. Du Pont De Nemours And Company | Filter element |
US4704077A (en) * | 1984-10-16 | 1987-11-03 | Barmag Ag | Melt spinning apparatus |
US5486105A (en) * | 1992-12-14 | 1996-01-23 | Toshiba Kikai Kabushiki Kaisha | Apparatus for controlling a heating temperature |
US5484539A (en) * | 1993-11-08 | 1996-01-16 | Zimmer Aktiengesellschaft | Process for filtering polymer melts with dead spot reduction |
US5462653A (en) * | 1994-02-15 | 1995-10-31 | Hills, Inc. | Apparatus for continuous polymer filtration |
US6171536B1 (en) * | 1998-04-10 | 2001-01-09 | Arteva North America S.A.R.L. | Apparatus and method for melt spinning of molten polymeric material |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005045104A1 (en) * | 2003-10-21 | 2005-05-19 | Saurer Gmbh & Co. Kg | Spinning head and filter device for said type of spinning head |
CN108411387A (en) * | 2018-04-20 | 2018-08-17 | 中国纺织科学研究院有限公司 | Melt spinning apparatus |
CN115418729A (en) * | 2022-08-01 | 2022-12-02 | 浙江理工大学 | Melt filtering device for preparing colored superfine washing cotton composite fiber |
Also Published As
Publication number | Publication date |
---|---|
DE10140581A1 (en) | 2003-02-27 |
EP1285981A1 (en) | 2003-02-26 |
CN1407144A (en) | 2003-04-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NEUMAG GMBH & CO, GERMAN DEMOCRATIC REPUBLIC Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HOLGER, BRANDT;RAVE, HENNING;BECK, ARNOLD;AND OTHERS;REEL/FRAME:013337/0706 Effective date: 20020903 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |