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Publication numberUS3323168 A
Publication typeGrant
Publication dateJun 6, 1967
Filing dateMay 17, 1963
Priority dateMay 24, 1962
Publication numberUS 3323168 A, US 3323168A, US-A-3323168, US3323168 A, US3323168A
InventorsDe Wolf Willem, Drunen Korstian J M Van
Original AssigneeAmerican Enka Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Spinneret for spinning hollow filaments
US 3323168 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

June 1967 K. J. M. VAN 'DFZUNEN ETAL 3,323,168

SPINNERET FOR SPINNING HOLLOW FILAMENTS Filed May 17, 1965 F163 F164 FIG 5 I 5 no.7] F168 INVENTORS KOIZSTlAN d. M. VAN DEUNEN WILLEM DE WOLF BY 'A/MW fllww ATTORNEYS United States Patent 3,323,168 SPINNERET FOR SPINNING HOLLOW FILAMENTS Korstian J. M. van Drunen and Willem de Wolf, Arnhem, Netherlands, assignors to American Enka Corporation, Erika, N.C., a corporation of Delaware Filed May 17, 1963, Ser. No. 281,253 Claims priority, application Netherlands, May 24, 1962, 278,885 6 Claims. (Cl. 188) The invention relates to an apparatus for the manu facture of hollow synthetic threads and staple fibers by extruding the melt of polycondensation products or polymerization products, such as polyamides, polyesters, polyolefines, etc, through one or more slit-shaped spinning orifices including a novel spinneret.

There is a known process for the manufacture of hollow synthetic threads and staple fibers from synthetic linear polycondensation products or polymerization prod ucts by extruding the melt of poly-condensation products or polymerization products into a gaseous medium through at least one slit-shaped spinning orifice in a spinneret, each spinning orifice consisting of two or more arc-like slits which, in combination, partly surround a section of the spinneret, the distances between the neighboring slits ranging from 1 to 6 times the width of the slits. A disadvantage of this process is that after spinning has proceeded for some time the melt no longer coalesces, so that instead of hollow threads ribbon-shaped threads are obtained.

There is also a known process in which the melt of polycondensation products or polymerization products is extruded into a gaseous medium through a spiral slit the two ends of which are parallel with each other. A disadvantage of this spiral slit is that after spinning has proceeded for a short time, the core of the spiral is forced out of the spinneret, which is particularly the case in the spinning of high-denier threads, where a high pressure is exerted on the spinneret.

It is an important object of this invention to provide an improved apparatus for the preparation of hollow synthetic threads or staple fibers which will be free from the foregoing and other disadvantages.

A further object of this invention is the provision of a novel spinneret for the preparation of hollow synthetic threads or staple fibers, having a basis of synthetic linear polycondensation or polymerization products, of improved properties.

Other objects of this invention will appear from the following description.

It has now been found that if the melt spinning of polycondensation products or polymerization products, such as polyamides, polyesters, polyolefines and the like, is conducted in a certain prescribed manner and with certain prescribed apparatus, the threads so produced will have smooth surfaces and show very satisfactory properties such as high covering power. Woven and knitted fabrics prepared from such threads retain heat satisfactorily and are voluminous and elastic.

In its broadest aspect the instant invention comprises the production of hollow synthetic threads from a melt of synthetic linear polycondensation products or polymerization products by extruding the melt through a spinneret provided with spinning orifices in the form of slits. The magnitude of the hollow space in the thread to be spun is dependent on the ratio between the partly surrounded area and the slit width. The slit width may vary from 0.02 to 0.4 mm.

In the accompanying drawing, FIGURES 1-8 illustrate various embodiments of the present invention.

The slits of the spinning orifices, in combination, partly surround a surface area of from 0.01 to 7 mm. and the ends of the neighboring slits preferably run parallel to one another as shown in FIGURES 1-8. The distance along which the slits run parallel to one another may vary between wide limits, namely from 0.05 to 2 mm.

The ends of neighboring arc-like slits run parallel to one another or may be bent, in which case the bent ends run parallel to one another (FIGURES 1-5). The ends may be bent inwards (FIGURES 1 and 5) or outwards (FIGURES 3 and 4). However, it is also possible for them to be bent both inwards and outwards (FIGURE 2).

In accordance with this invention a melt of a polycondensation product or a polymerization product is extruded through a spinneret provided with one or more slit-shaped spinning orifices, each spinning orifice consisting of two or more arc-like slits which, in combination, partly surround a section of the spinneret. The distances between the neighboring slits range from 1 to 6 times the width of the slits. The slits, in combination, partly surround a surface area of from 0.1 to 7 mm?, and the ends of the neighboring slits run parallel to one another. In this spinneret the distance along which the slits run parallel to one another is from 0.05 to 2 mm., and the slits have a width of from 0.02 to 0.4 mm.

In the spinneret according to this invention the ends of the neighboring slits may be bent, i.e., the spinneret slits may be shaped to contain slits extending toward and/or away from a central point within the partiallyenclosed area.

Where the arc-like slits are provided on the outside with side slits (FIGURE 6), then hollow threads are obtained having profiled cross-sections, which is, as a matter of fact, also the case where the ends of the slits are bent outwards. These profiled hollow threads have higher covering power than have the non-profiled threads according to the invention.

Threads having triangular or quadrangular cross-sections reflect the light in a special way, as a result of which they produce, when worked up in textile products, special effects which make these products extremely suitable for various applications.

Where the ends of ithe slits are bent inwards, it is also possible to spin threads which show a plurality of hollow spaces instead of one.

The arc-like splits may be parts of circles or of elipses. However, they also may be parts of polygons (FIGURE 1). Two or more of the spinning orifices according to the invention may be interconnected.

Although the depth of the slits in the spinneret is not critical, it is still advisable not to make the same extremely small. According to the invention the depth of the slits should preferably be more than 0.1 mm.

It is to be understood that the foregoing description is given merely by way of illustration and that many variations may be made therein without departing from the spirit of this invention.

What is claimed is:

1. A spinneret for the manufacture of hollow synthetic threads or staple fibers from synthetic linear polycondensation products or polymerization products, said spinneret being provided with at least one slit-shaped spinning orifice, each spinning orifice consisting of at least two separate arc-like slits which, in combination, partly surround a section of the spinneret, the distances between the neighboring slits ranging from 1 to 6 times the Width of the slits, said slits, in combination, partly surrounding a surface area of from 0.1 to 7 mm? the ends of the neighboring slits running parallel to one another and the ends of the neighboring slits are bent.

2. A spinneret according to claim 1, characterized in that the distance along which the slits run parallel to one another is from 0.05 to 2 mm.

3. A spinneret according to claim 1, characterized in that the slits have a width of from 0.02 to 0.4 mm.

4. A spinneret according to claim 1, characterized in 1261352 that the ends are bent inwards. 843,179 5. A spinneret according to claim 1, characterized in 5 853,062 that the ends are bent outwards.

891,464 6. A splnneret according to claim 1, characterized in that the ends are bent both inwards and outwards. 90O441 FOREIGN PATENTS ALEXANDER H. BRODMERKEL, Primary Examiner.

F. S. WHISENHUNT, I. H. WOO, Assiszant Examiners.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3174364 *Apr 15, 1963Mar 23, 1965Monsanto CoProcess for the manufacture of spinnerets for melt spinning
FR1261352A * Title not available
GB843179A * Title not available
GB853062A * Title not available
GB891464A * Title not available
GB900441A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3405424 *Oct 27, 1966Oct 15, 1968Inventa AgDevice and process for the manufacture of hollow synthetic fibers
US3456292 *Mar 30, 1967Jul 22, 1969Du PontSpinneret
US3465618 *Dec 23, 1966Sep 9, 1969Monsanto CoMethod of manufacturing a meltspinning spinneret
US3635641 *Dec 3, 1969Jan 18, 1972Allied ChemSpinnerette for producing hollow filaments
US3640670 *Jun 20, 1968Feb 8, 1972Fiber Industries IncSpinnerette for extruding t-shaped filaments
US3728428 *Jun 10, 1971Apr 17, 1973Allied ChemProcess for producing hollow filaments
US3853687 *Dec 27, 1971Dec 10, 1974Asahi Chemical IndModified synthetic fibers and a process for the manufacture of same
US3924988 *May 24, 1972Dec 9, 1975Du PontHollow filament spinneret
US4176150 *Mar 18, 1977Nov 27, 1979Monsanto CompanyProcess for textured yarn
US4254181 *Mar 20, 1978Mar 3, 1981Monsanto CompanyFilaments having alternate S-twisted and Z-twisted helical sections produced by crimping filaments provided with an eccentric anisotropy of shrinkable property by a preferential cooling on one side upon extrusion thereof through a spinneret
US4376743 *Jun 12, 1981Mar 15, 1983Fiber Industries, Inc.Melt spinning process
US4376746 *Sep 17, 1981Mar 15, 1983Ametek, Inc.Formation of hollow tapered brush bristles
US5686121 *Dec 8, 1995Nov 11, 1997E. I. Du Pont De Nemours And CompanySpinneret for producing a filament having a triangular cross-section and 3 or 6 axially extending voids
US6048615 *Jan 30, 1998Apr 11, 2000E. I. Du Pont De Nemours And CompanyFilament having a trilobal cross-section and a trilobal void
US6099288 *Mar 20, 1998Aug 8, 2000Mp6, L.L.C.Pellet forming extrusion apparatus
US6589653Aug 8, 2001Jul 8, 2003E. I. Du Pont De Nemours And CompanyFilament having a quadrilobate exterior cross-section and a four-sided void
US6746230May 8, 2001Jun 8, 2004Wellman, Inc.Apparatus for high denier hollow spiral fiber
US6797209Feb 12, 2003Sep 28, 2004Wellman, Inc.Method and apparatus for high denier hollow spiral fiber
US7001664Sep 27, 2004Feb 21, 2006Wellman, Inc.Method and apparatus for high denier hollow spiral fiber
US7229688Sep 13, 2005Jun 12, 2007Wellman, Inc.Method and apparatus for high denier hollow spiral fiber
US20030118763 *Feb 12, 2003Jun 26, 2003Travelute Frederick L.Method and apparatus for high denier hollow spiral fiber
US20050037196 *Sep 27, 2004Feb 17, 2005Travelute Frederick L.Method and apparatus for high denier hollow spiral fiber
US20050095312 *Nov 24, 2004May 5, 2005Invista North America S.A R.L.Polymer filaments having profiled cross-section
US20050147788 *Nov 19, 2004Jul 7, 2005Invista North America S.A R.L.Spinneret plate for producing a bulked continuous filament having a three-sided exterior cross-section and a convex six-sided central void
US20060014015 *Sep 13, 2005Jan 19, 2006Travelute Frederick LMethod and apparatus for high denier hollow spiral fiber
US20070231519 *Jun 11, 2007Oct 4, 2007Wellman, Inc.Method and Apparatus for High Denier Hollow Spiral Fiber
Classifications
U.S. Classification425/461, 264/177.14
International ClassificationD01D5/00, D01D5/24
Cooperative ClassificationD01D5/24
European ClassificationD01D5/24