EP0369460A2 - Filière - Google Patents

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Publication number
EP0369460A2
EP0369460A2 EP89121297A EP89121297A EP0369460A2 EP 0369460 A2 EP0369460 A2 EP 0369460A2 EP 89121297 A EP89121297 A EP 89121297A EP 89121297 A EP89121297 A EP 89121297A EP 0369460 A2 EP0369460 A2 EP 0369460A2
Authority
EP
European Patent Office
Prior art keywords
spinneret
capillary
length
capillaries
plate
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.)
Granted
Application number
EP89121297A
Other languages
German (de)
English (en)
Other versions
EP0369460B1 (fr
EP0369460A3 (en
Inventor
Henry Kobsa
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0369460A2 publication Critical patent/EP0369460A2/fr
Publication of EP0369460A3 publication Critical patent/EP0369460A3/en
Application granted granted Critical
Publication of EP0369460B1 publication Critical patent/EP0369460B1/fr
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

  • This invention relates to spinneret capillaries and more particularly it relates to spinneret capillaries having a length to width ratio greater than 2.
  • the most common method of making spinneret capillary passageways is to counterbore a hole partway through the plate, then to complete the hole by punching through the remaining thickness.
  • the counterbore and punch method is generally recognized as being the least expensive, being versatile in the shapes which can be formed, and giving the most uniform capillaries.
  • drills are more fragile than punches, their use is generally limited to forming larger sized holes.
  • the capillary portion of the passageway has been limited either to short length or to relatively large diameter by the physical characteristics of the punch, drill, or other tools used to form the passageway. Because of the short length of the capillary when made by methods of the prior art, insufficient molecular orientation is imparted to the filaments during spinning or extrusion of the filaments, causing their cross-sectional shapes to change considerably from the designed shape of the hole. Particularly in the spinning of hollow filaments, a short capillary reduces significantly the amount of structural support to the internal element or obstruction in the passageway which produces the hollow interior portion of the filament. This limits the number of times a spinneret face can be lapped or polished, in order to remove nicks or other minor imperfections. In addition, failure to impart sufficient orientation to the hollow filaments during spinning or extrusion causes many undesired opened or split filaments to be formed instead of the desired true hollow filaments.
  • the ideal spinneret would have complete capillary-to-capillary uniformity, as well as uniformity along the length of the capillary.
  • Each capillary would have a length to width ratio of at least 1.5, and preferably 2 or more, for adequate molecular orientation during spinning.
  • the holes would be as small as practical for accurate metering of the polymer streams, and the capillary walls would be straight for the same reason.
  • the spinneret would be made from hard metal for long life. Further, the spinneret would operate at low pressures (e.g., at less than 14,000 kPa) to reduce pack leaks and pumping requirements.) Unfortunately, the requirement for good metering (small, straight-sided holes with long length-to-width dimensions) conflicts with low pressure operation.
  • the invention significantly reduces the pressure drop through the capillary by tapering the capillary in the direction of polymer flow through the spinneret.
  • the spinneret comprises a metal plate having upper and lower surfaces connected by a passage.
  • the passage exits the lower surface of the plate in a capillary length having a length to width ratio greater than 1.5, preferably greater than 2, with sidewalls that taper toward the lower surface of the plate at an included angle greater than about 3 degrees and preferably between 3 and about 20 degrees.
  • the plate preferably has a hardness greater than 150 Brinell.
  • Fig. 1 is a plan view of the portion of the exit face of a spinneret plate 10 having one complex slot type spinneret capillary 12.
  • spinneret capillary as herein defined is a complex arrangement of slot type openings together providing for the extrusion of one filament.
  • the capillary 12 comprises four peripheral slot type openings 14 generally surrounding an inner minute area. Extending radially inward short of a common intersection are four straight slot type openings 18 each joining the peripheral openings 14 at their centers.
  • the peripheral width of air vents 16 is less than the radial width of each opening 14.
  • T-shaped streams are formed at and immediately downstream of the exit face of spinneret plate 10. Adjacent ends of the T-shaped streams then coalesce to form a continuous integral filament having four uniform voids extending continuously therealong. Air vents 16 allow entrance of air into the voids before coalescence, thus, preventing the collapse of the filament due to the internal vacuum which otherwise would result.
  • peripheral openings 14 are shown at exit face 28 leading to their simultaneously machined tapered counterbores 22.
  • radial openings 18 with counterbores 26 separated by unmachined area 24.
  • Spinneret plate 10 is ordinarily much thicker than the thickness between entrance 30 of the capillary and exit face 28.
  • larger counterbore 20 with flat entrance face 30 is machined into plate 10 at each location where a spinneret capillary is to be formed.
  • the ratio of length 14 a of the capillary to the width 18a of the capillary slot is preferably greater than 2 and the sidewalls of the capillary slots are tapered in the direction of the lower surface 28 of the spinneret plate 10 at an included angle A which preferably is in the range of from about 3 to about 20 degrees.
  • the slots 14 and 18 preferably are between about 0.050 mm and 0.130 mm in width (18 a ) and between about 0.40 mm and 1.0 mm in length (14 a ).
  • the slot openings 14 are preferably equal to slot openings 18.
  • the capillaries are made by cutting the holes with a laser beam (150 watt pulsed Nd YAG Laser by Lasag, followed by polishing the inside of the holes, using fluid machining equipment such as supplied by Extrude Hone Corporation of Irwin, PA.
  • a laser beam 150 watt pulsed Nd YAG Laser by Lasag
  • fluid machining equipment such as supplied by Extrude Hone Corporation of Irwin, PA.
  • the spinneret capillary shown in Figs. 1 and 2 is exemplary of the variety of complicated capillaries which can utilize the principles of this invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
EP19890121297 1988-11-18 1989-11-17 Filière Expired - Lifetime EP0369460B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27306988A 1988-11-18 1988-11-18
US273069 1988-11-18

Publications (3)

Publication Number Publication Date
EP0369460A2 true EP0369460A2 (fr) 1990-05-23
EP0369460A3 EP0369460A3 (en) 1990-09-05
EP0369460B1 EP0369460B1 (fr) 1995-02-08

Family

ID=23042414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890121297 Expired - Lifetime EP0369460B1 (fr) 1988-11-18 1989-11-17 Filière

Country Status (6)

Country Link
EP (1) EP0369460B1 (fr)
JP (1) JPH02191705A (fr)
BR (1) BR8905674A (fr)
CA (1) CA2001426A1 (fr)
DE (1) DE68921043T2 (fr)
RU (1) RU1838461C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2272999A3 (fr) * 2009-07-07 2011-02-02 Shinkong Synthetic Fibers Corporation Fibre à section transversale en 4T
CN102251297A (zh) * 2010-05-21 2011-11-23 新光合成纤维股份有限公司 4t型断面的纤维
CN107663666A (zh) * 2016-07-27 2018-02-06 新光合成纤维股份有限公司 仿羽绒纤维

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006029972A1 (de) * 2006-06-29 2008-01-03 Irema-Filter Gmbh Vorrichtung zur Erzeugung eines Faservlieses im Melt-Blown-Verfahren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608041A (en) * 1964-01-09 1971-09-21 Celanese Corp Spinning process
GB1136689A (en) * 1967-07-31 1968-12-11 Schwarza Chemiefaser Spinneret
US4015924A (en) * 1973-08-10 1977-04-05 Celanese Corporation Spinning apparatus providing for essentially constant extensional strain rate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2272999A3 (fr) * 2009-07-07 2011-02-02 Shinkong Synthetic Fibers Corporation Fibre à section transversale en 4T
CN102251297A (zh) * 2010-05-21 2011-11-23 新光合成纤维股份有限公司 4t型断面的纤维
CN107663666A (zh) * 2016-07-27 2018-02-06 新光合成纤维股份有限公司 仿羽绒纤维

Also Published As

Publication number Publication date
BR8905674A (pt) 1990-06-05
EP0369460B1 (fr) 1995-02-08
DE68921043T2 (de) 1995-09-14
CA2001426A1 (fr) 1990-05-18
RU1838461C (ru) 1993-08-30
JPH02191705A (ja) 1990-07-27
DE68921043D1 (de) 1995-03-23
EP0369460A3 (en) 1990-09-05

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