US3706826A - Melt spinning process - Google Patents

Melt spinning process Download PDF

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Publication number
US3706826A
US3706826A US39525A US3706826DA US3706826A US 3706826 A US3706826 A US 3706826A US 39525 A US39525 A US 39525A US 3706826D A US3706826D A US 3706826DA US 3706826 A US3706826 A US 3706826A
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US
United States
Prior art keywords
birefringence
filament
region
filaments
air
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.)
Expired - Lifetime
Application number
US39525A
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English (en)
Inventor
James Duncan Bremner
Iain Alexander Mclellan
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.)
Imperial Chemical Industries Ltd
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Imperial Chemical Industries Ltd
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Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
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Publication of US3706826A publication Critical patent/US3706826A/en
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    • 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
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters

Definitions

  • This invention relates to melt spinning processes for aromatic polyesters in which 'a fluid stream of polymer is extruded at a controlled speed from a spinnert, and cooled to form a solidified filament which is hauled oif at a higher controlled speed; such filaments being subsequently drawn.
  • filamentary streams cool rapidly but remain molten for a substantial initial distance from the spinneret, within which region any chance contacts cause them at least temporarily to coalesce. -In this region the bulk of the stretching occurs.
  • This molten region is followed by a short plastic region in which the viscosity rises between the previous molten region and the subsequent solidified region. In this plastic region occasional contact between filaments does not cause the problems due to coalescence which characterise the molten region but some stretching continues and the bulk of the birefringence is introduced.
  • the plastic region is followed by a solidified region in which no significant further stretching or birefringence changes occur.
  • the air used in such an ejector device may be, but need not be heated.
  • the rate of heat transfer between filaments and a roller is however much higher and a driven roller forwarding device should normally therefore be heated to maintain the filament temperature in the required intermediate plastic range.
  • FIG. 1 is a schematic diagram of a melt spinning process according to the invention and FIGS. 2 and 3 are cross-sections of suitable forms of air ejector.
  • FIG. 1 a spinning pack 11 with a spinneret 12 at its base extrudes filamentary streams 13 which at first are subject to delayed cooling in the region 14 which is partially enclosed in the thermostated box 15 used to heat the pack 11.
  • An air ejector 16 surrounds the threadline at a point between the spinneret 12 and a spin finish applicator 17. The filaments are wound up on a bobbin 18.
  • FIG. 2 illustrates one suitable form of air ejector.
  • a short wide bore venturi tube 21 is held by a screw thread in a. casing member 22 with an air inlet duct 23 connected to a compressed air supply line 24 by a valve 25. Air is distributed round the venturi tube in the chamber 26 and escapes through annular slot 27.
  • FIG. 3 illustrates another suitable form of air ejector.
  • Two members 30 and 31 are engaged in a threaded bore in a member 32, forming an annular chamber 33 connected by an annular passageway 34 to a yarn passageway 35.
  • Compressed air is fed from means not shown through a bore 36 in member 32.
  • compressed air passes through the passageway 34 to apply a downward force on a yarn in passageway 35.
  • EXAMPLE II Polyethylene terephthalate with an intrinsic viscosity of 0.67 in orthochlorophenol at 25 C. was extruded at 290 C. through spinneret holes each 9 thou. diameter to form 20 filaments which were wound up at 4800 f.p.m. as 8 denier filaments. The apparatus of FIG. 3 was placed 19 inches below the spinneret.
  • EXAMPLE III In place of an air ejector, two driven unheated capstans were positioned 17.5 inches below the spinneret. Polyethylene terephthalate with an intrinsic viscosity of 0.67 was extruded at 295 C. to form five filaments wound up at 3700 f.p.m. at a denier of 12. When the threadline passed the capstans without touching them the resultant birefringence was 0.0085. When the threadline took one complete turn round the capstans rotating at 4075 f.p.m. the birefringence fell to 0.0080. Since the capstan speed was slightly higher than the wind up speed it will be clear that a downward force was applied to the threadline but the tension between the air ejector and the wind up means was positive.
  • This relatively small reduction in birefringence may be increased by heating the driven capstans.
  • a melt spinning threadline modified according to this invention is particularly advantageous in processes involving separate spinning and drawing, such as are common in the production of staple fibre. In these processes, the productivity advantage of a high spinning speed can be greatly enhanced by the suppression of spun filament birefringence according to this invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Artificial Filaments (AREA)
US39525A 1969-05-23 1970-05-21 Melt spinning process Expired - Lifetime US3706826A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26429/69A GB1268908A (en) 1969-05-23 1969-05-23 Improved melt spinning process for aromatic polyesters

Publications (1)

Publication Number Publication Date
US3706826A true US3706826A (en) 1972-12-19

Family

ID=10243490

Family Applications (1)

Application Number Title Priority Date Filing Date
US39525A Expired - Lifetime US3706826A (en) 1969-05-23 1970-05-21 Melt spinning process

Country Status (7)

Country Link
US (1) US3706826A (fr)
JP (1) JPS494014B1 (fr)
BE (1) BE750515A (fr)
DE (1) DE2025109A1 (fr)
FR (1) FR2048728A5 (fr)
GB (1) GB1268908A (fr)
NL (1) NL7007336A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946100A (en) * 1973-09-26 1976-03-23 Celanese Corporation Process for the expeditious formation and structural modification of polyester fibers
US4185062A (en) * 1977-02-23 1980-01-22 Snia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.P.A. Process for high speed production of pre-oriented yarns
US4202855A (en) * 1976-04-23 1980-05-13 Karl Fischer, Apparate-und Rohrleitungsbau Method of producing continuous multifilament yarns
US4692106A (en) * 1985-02-05 1987-09-08 Reifenhauser Gmbh & Co. Maschinenfabrik Apparatus for stretching the individual strands of a bundle of fibers or threads
US5336071A (en) * 1990-03-14 1994-08-09 Mitsui Petrochemical Industries, Ltd. Air gun for the production of non-woven fabric and non-woven fabric producing apparatus
US5976431A (en) * 1993-12-03 1999-11-02 Ronald Mears Melt spinning process to produce filaments
CN104947208A (zh) * 2015-07-02 2015-09-30 南通百博丝纳米科技有限公司 制备纳米纤维的喷丝装置及纺丝装置
CN111793839A (zh) * 2020-06-30 2020-10-20 浙江海利环保科技股份有限公司 一种延缓丝束冷却纺制多f细旦再生涤纶长丝的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041327B1 (fr) * 1980-05-30 1983-09-07 Imperial Chemical Industries Plc Procédé de filage au fondu
US5070185A (en) * 1987-12-22 1991-12-03 Basf Corporation High shrinkage polyester fibers and method of preparation
DE102017123992A1 (de) * 2017-10-16 2019-04-18 Kraussmaffei Technologies Gmbh Einschnecken-Plastifiziereinheit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946100A (en) * 1973-09-26 1976-03-23 Celanese Corporation Process for the expeditious formation and structural modification of polyester fibers
US4202855A (en) * 1976-04-23 1980-05-13 Karl Fischer, Apparate-und Rohrleitungsbau Method of producing continuous multifilament yarns
US4185062A (en) * 1977-02-23 1980-01-22 Snia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.P.A. Process for high speed production of pre-oriented yarns
US4692106A (en) * 1985-02-05 1987-09-08 Reifenhauser Gmbh & Co. Maschinenfabrik Apparatus for stretching the individual strands of a bundle of fibers or threads
US5336071A (en) * 1990-03-14 1994-08-09 Mitsui Petrochemical Industries, Ltd. Air gun for the production of non-woven fabric and non-woven fabric producing apparatus
US5976431A (en) * 1993-12-03 1999-11-02 Ronald Mears Melt spinning process to produce filaments
CN104947208A (zh) * 2015-07-02 2015-09-30 南通百博丝纳米科技有限公司 制备纳米纤维的喷丝装置及纺丝装置
CN111793839A (zh) * 2020-06-30 2020-10-20 浙江海利环保科技股份有限公司 一种延缓丝束冷却纺制多f细旦再生涤纶长丝的方法

Also Published As

Publication number Publication date
DE2025109A1 (de) 1970-11-26
NL7007336A (fr) 1970-11-25
GB1268908A (en) 1972-03-29
JPS494014B1 (fr) 1974-01-30
FR2048728A5 (fr) 1971-03-19
BE750515A (fr) 1970-11-16

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