US3752874A - Process for melt spinning - Google Patents

Process for melt spinning Download PDF

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Publication number
US3752874A
US3752874A US00165985A US3752874DA US3752874A US 3752874 A US3752874 A US 3752874A US 00165985 A US00165985 A US 00165985A US 3752874D A US3752874D A US 3752874DA US 3752874 A US3752874 A US 3752874A
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US
United States
Prior art keywords
shield
spinneret
face
exposed
spinning
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
US00165985A
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English (en)
Inventor
R Coates
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
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US3752874A publication Critical patent/US3752874A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes

Definitions

  • the present invention relates to the melt-spinning of fibre-forming polymers, more particularly to the minimizing of variability in performance between the members of a set of spinnerets producing a single type of filament.
  • the present invention we provide a process for the manufacture of filaments by the melt-spinning of a fibre-forming polymer through a plurality of spinning packs each having a spinneret with a face exposed to the ambient atmosphere, wherein variation between the rates of loss of heat from the exposed faces of the various spinnerets is minimized by the close proximity to the exposed spinneret face of a shield of substantially the same size and shape as the exposed spinneret face, at least the faces of said shields directed towards said exposed spinneret faces being maintained at substantially constant and substantially identical temperatures.
  • spinneret with a face exposed to ambient atmosphere and associated therewith in close proximity a shield of substantially the same size and shape as the spinneret.
  • a spinneret for melt-spinning derives its heat indirectly from a heat transfer medium which is con-veniently a fluid but may also be a metallic block heated by, for example, electrical means. Since the heat transfer medium is normally kept at a constant temperature throughout a bank of spinning units, it is preferable that the shield of our invention shares the same source of heat. Preferably the temperature of the shield should differ from that of the heat transfer medium by no more than 50 C., and more desirably by no more than C.
  • the shield should be of such form that the threadline or threadlines do not contact it in passing.
  • a hole, or holes are provided in the shield opposite the spinneret orifices. the edges of said hole, or holes, being at least one sixteenth of an inch away from the nearest filament.
  • the shield may be fixed or it may be movable or removable to permit wiping of the spinneret face.
  • a shield may be in more than one part.
  • the shield may be in two parts one each side of the straight line, the two parts of the shield delineating a narrow band free from shielding and in which the spinneret holes are situated.
  • the shield should preferably not be in contact with the spinneret face, since extent and intimacy of contact are not subject to accurate control. We have found it advantageous to arrange for the shield at no point to be distant from the spinneret face by less than one thirty second of an inch. On the other hand, the shield should not be distant by more than one inch from the spinneret face. We have found particularly good results when the shield is substantially uniformly distant from the spinneret face throughout its area and the distance apart is one eighth of an inch.
  • the facility for temporarily moving or removing the shield from its proximity with the spinneret face implies flexibility in, or the ability temporarily to disconnect, the means for conveying heat to or removing heat from the shield.
  • the face of the shield directed towards the spinneret face should preferably be polished, for example it may be chrome plated. Since controlling the temperature of the shield at the desired level is facilitated by minimizing heat losses from it, its face directed away from the spinneret face should also preferably be polished. Whilst it is advantageous that the material of construction of the shield should be of high thermal conductivity so that heat is freely passed between the face of the shield directed towards the spinneret face and the heat conveying means, the side of the shield directed away from the spinneret face may be provided with a layer of low conductivity with advantage.
  • the material of high conductivity may, for example, be copper, aluminium or silver; the layer of low conductivity may for example, be a layer of asbestos or a chamber which contains air or which is evacuated.
  • FIG. 1 shows a vertical section through a spinning pack and shield
  • FIG. 2 shows a view from below the spinneret of FIG. 1.
  • a spinning pack 1 has spinneret 2 at its lower part.
  • the spinning pack 1 is heated by a vapour jacket 3 and the pack 1 and vapour jacket 3 are insulated by a muff 4, an insulating lid 5 and insulation 6.
  • a spinneret shield 7 of copper 0.75 inch thick and distant from the lower, free face of the spinneret 2 by A; inch.
  • the shield 7 is insulated by insulation 8.
  • the shield 7 is in good metallic contact with wall of the vapour jacket 3.
  • the lower face of the spinneret 2, which without the shield 7 would be exposed to the ambient atmosphere, is circular and of diameter 5 inches.
  • the proportion of the face of the spinneret 2 which is shielded by the shield 7 is The spinneret 2 bears two rows of spinneret holes 9. Filaments extending downwards from the spinneret holes are distant from the nearest point of the shield 7 by 0.25 inch.
  • the step of minimizing variation between the rates of loss of heat from the exposed faces of the various spinnerets by disposing in close proximity to the exposed spinneret face a shield of substantially the same size and shape as the exposed spinneret face, and maintaining at least the faces of said shields directed towards said exposed spinneret faces at substantially constant and substantially identical temperatures.
  • Apparatus for the manufacture of filaments by melt-spinning comprising: a plurality of spinning packs each having a spinneret plate with a face exposed to ambient atmosphere; means for heating the spinneret packs; a shield for minimizing variations between the rates of loss of heat from the exposed faces of the spinnerets, said shield having a size and shape substantially the same as the exposed spinneret face and having faces directed toward said exposed faces, said shield faces being closely spaced to but not in contact with said exposed faces; and means for maintaining at least said faces of said shield at a substantially constant temperature which is substantially the same as the temperature of said spinneret faces.
  • Apparatus as in claim 14 wherein the means for heating the spinneret packs includes a jacket for passing a heated fluid in heat transmission relationship with the packs, and wherein said shield is disposed in heat transmission relationship with said jacket.
  • Apparatus as in claim 11 including a layer of low thermal conductivity on the side of the shield directed away from the spinneret face.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US00165985A 1970-08-04 1971-07-26 Process for melt spinning Expired - Lifetime US3752874A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37582/70A GB1298413A (en) 1970-08-04 1970-08-04 Process for melt spinning

Publications (1)

Publication Number Publication Date
US3752874A true US3752874A (en) 1973-08-14

Family

ID=10397533

Family Applications (1)

Application Number Title Priority Date Filing Date
US00165985A Expired - Lifetime US3752874A (en) 1970-08-04 1971-07-26 Process for melt spinning

Country Status (7)

Country Link
US (1) US3752874A (enrdf_load_stackoverflow)
AU (1) AU456152B2 (enrdf_load_stackoverflow)
DE (1) DE2138201A1 (enrdf_load_stackoverflow)
FR (1) FR2103925A5 (enrdf_load_stackoverflow)
GB (1) GB1298413A (enrdf_load_stackoverflow)
NL (1) NL7110508A (enrdf_load_stackoverflow)
ZA (1) ZA714973B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045529A (en) * 1975-10-01 1977-08-30 Eastman Kodak Company Process for making producer-colored fibers, yarns, films and related products
US5527178A (en) * 1993-05-24 1996-06-18 Courtaulds Fibres (Holdings) Limited Jet assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA943387B (en) * 1993-05-24 1995-02-17 Courtaulds Fibres Holdings Ltd Spinning cell

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045529A (en) * 1975-10-01 1977-08-30 Eastman Kodak Company Process for making producer-colored fibers, yarns, films and related products
US5527178A (en) * 1993-05-24 1996-06-18 Courtaulds Fibres (Holdings) Limited Jet assembly

Also Published As

Publication number Publication date
FR2103925A5 (enrdf_load_stackoverflow) 1972-04-14
AU3186271A (en) 1973-02-01
DE2138201A1 (de) 1972-02-10
ZA714973B (en) 1972-04-26
GB1298413A (en) 1972-12-06
AU456152B2 (en) 1974-12-12
NL7110508A (enrdf_load_stackoverflow) 1972-02-08

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