US20020090407A1 - Cooling device for cooling synthetic filaments - Google Patents

Cooling device for cooling synthetic filaments Download PDF

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Publication number
US20020090407A1
US20020090407A1 US09/996,546 US99654601A US2002090407A1 US 20020090407 A1 US20020090407 A1 US 20020090407A1 US 99654601 A US99654601 A US 99654601A US 2002090407 A1 US2002090407 A1 US 2002090407A1
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US
United States
Prior art keywords
cooling
filaments
shaft
openings
seamless
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
Application number
US09/996,546
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English (en)
Inventor
Michael Nuyten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stork Prints BV
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to STORK SCREENS B.V. reassignment STORK SCREENS B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NUYTEN, MICHAEL MARIA THOMAS
Publication of US20020090407A1 publication Critical patent/US20020090407A1/en
Assigned to STORK PRINTS B.V. reassignment STORK PRINTS B.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: STORK SCREENS B.V.
Abandoned legal-status Critical Current

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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
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys

Definitions

  • the present invention relates to a cooling device for cooling synthetic filaments, in particular for use in the spinning of (multi)filaments, which device comprises a housing with at least one inlet and at least one outlet for a cooling medium, and an entry for filaments which are to be cooled and an exit for cooled filaments, at least one cooling shaft being arranged between the entry and the exit, through which shaft the filaments are passed, and which cooling shaft is provided with openings allowing cooling medium to pass through.
  • a cooling device of this nature is generally known in the art.
  • Three different basic methods are used for the production of fibers or filaments, namely melt spinning, dry spinning and wet spinning, although there are many variations and combinations of these basic methods. It should, incidentally, be noted here that in the present application the term “spinning” is used in the broadest sense, namely that of the production of filaments, and is not limited to the production of filaments from staple fibers.
  • a spinneret is a die with a large number of capillaries, the diameter and shape of which may vary.
  • the jets of molten polymer which emerge from the capillaries are passed through a cooling zone, where the jet of polymer solidifies, resulting in the formation of a continuous filament.
  • the polymer is dissolved in a suitable solvent and the solution thus obtained is extruded under pressure through a spinneret.
  • the jets of polymer solution are passed into a heating zone, where the solvent evaporates from the polymer and the filament solidifies.
  • the polymer is likewise dissolved in a suitable solvent, and the solution thus obtained is extruded through a spinneret, which spinneret is submerged in a so-called coagulation bath.
  • Precipitation or chemical regeneration of the polymer in the form of a filament takes place in this coagulation bath.
  • the filaments thus obtained often have to undergo further treatments such as hot or cold stretching, twisting and texturing in order to obtain (multi)filaments having the desired properties for the intended end use.
  • the cooling after the extrusion step is of essential importance, since the uniformity of cooling has a direct influence on the physical parameters of the filaments, such as the uniformity of the thickness of the filaments or the dyeability.
  • the uniformity of cooling has a direct influence on the physical parameters of the filaments, such as the uniformity of the thickness of the filaments or the dyeability.
  • variations in these properties in the longitudinal direction of the filament and between different filaments are caused by a non-laminar or turbulent flow of the cooling medium, usually cooling air in the cooling zone, the molten filaments have to be cooled to below the melting point of the polymer before the filaments are able to come into contact with one another or with components of a device used for the production, such as guides.
  • a cooling shaft at least part of which is provided with openings allowing the cooling medium to pass through a cooling shaft of this nature is arranged, optionally directly, beneath one or more spinnerets of a spinning device and may optionally be operated with forced feed and/or discharge of cooling air. Examples of systems of this nature are described in DE-A-42 20 915, DE-A-42 23 198 and WO-A-93/19229.
  • a cooling shaft which is generally composed of a screen cloth or a tube which is perforated with holes and slots is used. More specifically, as examples of cooling shaft of this nature WO-A-93/19229 mentions a metal screen, in which case relatively large holes are arranged close together over the entire surface and a perforated shaft which is provided with perforations over its entire surface. The holes have a diameter of 1-5 mm, with a maximum passage of 50%. In Example 1 of this document a screen cylinder with a mesh density of 600/cm 2 is used.
  • a cooling shaft which is composed of a screen cloth or a cooling shaft whose walls arc perforated with small holes and slots is used.
  • the cooling shaft according to DE-A-42 23 198 is designed in the same way as that described in DE-A-42 20 915,
  • the shape of the cross section of the cooling shaft is adapted to the form of the spinneret arrangement.
  • the filament bundle is preferably surrounded by a cooling shaft.
  • a cooling shaft is made from screen material, it is necessary for this screen material to be supported at various locations, and the ends have to be attached to one another, for example via a weld seam.
  • This need for supporting measures and joints means that “dead” zones may form in the cooling shaft, and local heating of the virtually stationary cooling air in dead zones of this nature—since heat is transferred from the hot filament to the cooling air—interferes with the desired stable (laminar) flow of the cooling air. Consequently, the filaments are not subjected to a uniform cooling treatment, which may give rise to variations in the physical properties of the product. With a cooling shaft with large perforations, the risk of disruption to the desired laminar flow profile is also present, partly because the speed of movement of the filaments exerts a sucking action on the cooling air.
  • the object of the present invention is to at least partially eliminate the above drawbacks and, in particular, to provide a cooling shaft in which the risk of dead zones occurring is reduced further.
  • the cooling shaft comprises a seamless, electroformed support with passage-openings which are separated by dykes.
  • the cooling shaft is produced without a seam by means of electroforming.
  • a cooling shaft of this nature will be less susceptible to the formation of dead zones, with the result that the cooling treatment can be carried out more uniformly and thus a more uniform distribution of the properties in the filaments can be obtained.
  • an electroformed cooling shaft of this nature is sufficiently strong and resistant to bending, so that further supporting measures are not required.
  • a die for the electroforming of the cooling shaft, a die is used in which a system of electrical conductors which delimit isolating islands is provided.
  • the electrical conductors define the dykes which are to be formed, and the isolating islands define the passage-openings which are to be formed.
  • metal is electrodeposited on the electrical conductors to a desired thickness, after which the product thus obtained is removed from the die.
  • it is possible in the same way firstly to deposit a base skeleton of the cooling shaft on the die, which is allowed to grow further after it has been removed.
  • dies which are circular in cross section are used, so that the electroformed cooling shaft is also circular in cross section.
  • cooling shafts with lengths of the order of magnitude of from 20 mm to 50 mm and mesh numbers of approximately 50 to 100, in particular 60 or 70 mesh for a passage of 10 or 16% respectively, in practice function successfully for numerous applications.
  • the thickness or an electroformed cooling shaft of this nature in usually of the order of magnitude of 100 micrometers, although both thinner and thicker cooling shafts may be used.
  • the shape and dimensions of the cross section of the cooling shaft are adapted to the dimensions and shape of the spinneret.
  • FIG. 1 diagrammatically depicts melt spinning
  • FIG. 2 diagrammatically depicts an embodiment of a cooling device according to the invention.
  • the seamless, electroformed support is made from nickel, with the result that a cooling shaft with a long service life is obtained.
  • the passage-opening which are separated by dykes are arranged in a regular pattern.
  • the seamless, electroformed support may comprise a first zone in which there are passage-openings separated by dykes, and a second zone without passage-openings, which adjoins the first zone, as is already known per se from the prior art.
  • an uninterrupted sleeve is arranged displaceably inside the seamless, electroformed support. This sleeve without openings is used to seal off some of the passage-openings in the electroformed support, so that the amount of cooling air and the location where cooling air enters can be adjusted by the displacement of the sleeve in the seamless electroformed support.
  • the invention also relates to a seamless, electroformed support with passage-openings which are separated by dykes, which is suitable for use in the cooling device according to the invention.
  • the invention also relates to a device for producing synthetic filaments in which a cooling device according to the invention is used, as defined in claim 7 et seq.
  • the extrusion head or the extrusion device used is connected to the entry to the cooling device, and more preferably each spinneret from which monofilaments which are combined to a filament bundle emerge is connected to a cooling shaft of the cooling device.
  • the cooling device used has two outlets for cooling medium, one of which is arranged in the vicinity of the entry end of the cooling shaft and the other of which is arranged in the vicinity of its exit end. In this way, the cooling air supplied is discharged partially in concurrent and partially in countercurrent with respect to the path of the filaments. Such a direction of the air flow promotes the uniformity of the cooling treatment.
  • FIG. 1 shows a diagram for the melt spinning of a polymer, such as PET, during which process PET granules and, if desired, additives are fed via a hopper 1 to a screw type extruder 2 , in which the polymer is melted and than extruded.
  • the extruded polymer is fed to a spinneret 6 via a metering pump 3 , mixing device 4 and filter 5 .
  • the spinneret 6 is provided with a plurality of capillaries, out of which separate jets 7 of molten polymer are forced.
  • the jets 7 of molten polymer are cooled using cooling air (indicated by arrows) in a manner which is to be described in more detail if desired, additives may be applied at the end of tile cooling operation, such as a lubricant, after which the filaments which have been cooled separately in this way are combined to form a multifilament and are wound up for further processing.
  • Further processing of this nature may, for example, comprise the stretching of the yarn in order to obtain the desired orientation in the yarns, and texturing.
  • FIG. 2 shows part of an embodiment of a cooling device according to the invention.
  • a cooling device of this nature comprises a closed housing (not shown) in order to limit disruption to the cooling process caused by variation in environmental factors as far as possible.
  • the housing is provided with an inlet and an outlet for a cooling medium and an entry and an exit for filaments.
  • a cooling shaft 21 which comprises a cylindrical, thin-walled support 22 which is provided with a regular pattern of passage-openings 23 , is arranged in the housing.
  • the support 22 having passage-opening 23 is produced by means of electroforming as has already been explained above.
  • the top side of the cooling shaft 21 bears against a spinneret 6 with capillaries 24 , but if desired it may be arranged at a distance therefrom so that a relatively large amount of cooling air can cool the filaments directly beneath the spinneret 6 .
  • a thin-walled, tightly fitting, cylindrical sleeve 25 is arranged displaceably inside the cylindrical support 22 .
  • the cylindrical sleeve 25 which does not comprise any openings in its wall, is provided with a base 26 with a passage 27 for cooled filaments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US09/996,546 1999-05-28 2001-11-28 Cooling device for cooling synthetic filaments Abandoned US20020090407A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1012184A NL1012184C2 (nl) 1999-05-28 1999-05-28 Koelinrichting voor het koelen van synthetische filamenten.
NL1012184 1999-05-28
PCT/NL2000/000351 WO2000073545A1 (fr) 1999-05-28 2000-05-22 Dispositif de refroidissement destine a refroidir des filaments

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2000/000351 Continuation WO2000073545A1 (fr) 1999-05-28 2000-05-22 Dispositif de refroidissement destine a refroidir des filaments

Publications (1)

Publication Number Publication Date
US20020090407A1 true US20020090407A1 (en) 2002-07-11

Family

ID=19769280

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/996,546 Abandoned US20020090407A1 (en) 1999-05-28 2001-11-28 Cooling device for cooling synthetic filaments

Country Status (7)

Country Link
US (1) US20020090407A1 (fr)
CN (1) CN1210447C (fr)
AU (1) AU4956600A (fr)
CA (1) CA2375541A1 (fr)
DE (1) DE19962398A1 (fr)
NL (1) NL1012184C2 (fr)
WO (1) WO2000073545A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022841A1 (de) * 2000-05-10 2001-11-15 Zimmer Ag Kühlrohr zum Anblasen und Kühlen frisch gesponnener synthetischer Endlosfäden
DE10332645A1 (de) * 2003-07-18 2005-02-03 Saurer Gmbh & Co. Kg Vorrichtung zum Schmelzspinnen, Kühlen und Aufwickeln
JP3868404B2 (ja) * 2003-07-24 2007-01-17 Ｔｍｔマシナリー株式会社 溶融紡糸装置
CN103305949B (zh) * 2013-07-04 2016-04-13 吴江市汇泉纺织有限公司 一种熔丝张力控制装置
DE102021000256A1 (de) 2021-01-20 2022-07-21 Oerlikon Textile Gmbh & Co. Kg Vorrichtung zum Schmelzspinnen und Abkühlen einer frisch extrudierten Filamentschar
DE102021001308A1 (de) 2021-03-11 2022-09-15 Oerlikon Textile Gmbh & Co. Kg Vorrichtung zum Abkühlen eines frisch extrudierten Filamentbündels

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8002197A (nl) * 1980-04-15 1981-11-16 Stork Screens Bv Werkwijze voor het electrolytisch vervaardigen van een zeef, in het bijzonder cylindervormige zeef, alsmede zeef.
US4529368A (en) * 1983-12-27 1985-07-16 E. I. Du Pont De Nemours & Company Apparatus for quenching melt-spun filaments
JPS6285009A (ja) * 1985-10-11 1987-04-18 Teijin Ltd 紡出糸条の冷却装置
BR9400682A (pt) * 1993-03-05 1994-10-18 Akzo Nv Aparelho para a fiação em fusão de fios multifilamentares e sua aplicação

Also Published As

Publication number Publication date
DE19962398A1 (de) 2000-11-30
NL1012184C2 (nl) 2000-11-30
CA2375541A1 (fr) 2000-12-07
WO2000073545A1 (fr) 2000-12-07
CN1353780A (zh) 2002-06-12
AU4956600A (en) 2000-12-18
CN1210447C (zh) 2005-07-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: STORK SCREENS B.V., NETHERLANDS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NUYTEN, MICHAEL MARIA THOMAS;REEL/FRAME:012637/0535

Effective date: 20020205

AS Assignment

Owner name: STORK PRINTS B.V., NETHERLANDS

Free format text: CHANGE OF NAME;ASSIGNOR:STORK SCREENS B.V.;REEL/FRAME:014675/0526

Effective date: 20021031

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE