KR20110002031A - Multiend package of multifilament polyester bicomponent yarn - Google Patents

Abstract

Disclosed is a multi-end package of multicomponent yarns that is separable into individual ends at seatime. Multicomponent yarns may be two-component yarns, such as yarns comprising polyesters of different compositions in side-by-side or eccentric sheath-core form. The use of such multiend packages is also disclosed.

Description

MULTIEND PACKAGE OF MULTIFILAMENT POLYESTER BICOMPONENT YARN}

The present invention relates to a multi-end package of multicomponent yarns that is separable into individual ends at seasea. More specifically, the present invention relates to multi-end packages of polyester bicomponent continuous filament yarns, and separable yarns on such packages. The invention also relates to a process for producing a multiend package of detachable polyester bicomponent continuous filament yarns.

Typically, filament yarn production involves extruding multiple filaments from a spinneret, then combining all the filaments into one threadline and winding them onto a single package, or dividing the filaments into multiple filament yarns and winding each onto a single package. It includes. In either case, one multi-component thread is wound in one package. It is also known to have one "end" per package.

Polyester bicomponent filaments are elastomeric filaments that have elongation and recovery properties due to their three-dimensional crimp. Polyester bicomponent filaments are disclosed, for example, in US Pat. No. 3,671,379. High speed spinning of polyester bicomponent filaments comprising poly (ethylene terephthalate) and poly (trimethylene terephthalate) is disclosed, for example, in US Pat. No. 6,692,687. Single-ended polyester bicomponent fiber packages are disclosed, for example, in US Pat. No. 6,824,869.

U. S. Patent No. 5,524, 841 describes the improvement of winding of a plurality of textile strands or yarns, and of windings that improve the separation of a plurality of textile strands during dissolution of the wound package. This invention has been proposed to be useful in processes involving winding of monofilament or multifilament natural or synthetic materials or yarns, such as nylon, polyester, boron or carbon fiber or strands, but generally in the manufacture and processing of glass fibers. In the context of their use in the art.

U. S. Patent No. 5,665, 293 relates to the field of synthetic filament manufacturing and discloses a method for making a spun yarn package of a plurality of individually separable seal ends. This method is suitable for melt spinnable polymers disclosed in this patent as being nylons, such as nylon-6 and nylon-6,6, polyesters, and polyolefins such as polypropylene.

U. S. Patent Nos. 6,562, 456 and 5, 723, 080 disclose elastane multifilament yarns which can be split into individual filaments upon seabed from bobbins, and methods of making such yarns.

Conventionally, a 165 dtex yarn of 68 filaments of polyester bicomponent continuous filaments is extruded from a spinneret, and after quenching, tanning, drawing, interlacing, a single thread of 165 dtex-68 filaments into a tube, i.e., a single end Wind up into a package.

A multi-end package of yarns, i.e. one seal package with two or more seal ends wound, would be a way to reduce investment concentration and manufacturing costs while significantly increasing yarn manufacturing productivity. Sealed multi-end packages will also benefit from reducing the cost of subsequent machining processes such as beaming or core spinning as less equipment and capital investment will be required. However, there are significant technical difficulties in the manufacture of multi-end packages in which the yarns are consistently detachable at sea, especially in bicomponent continuous filament yarns having crimp, stretch and recovery properties. Nevertheless, as with the detachable yarn itself, a method for producing a multiend package of detachable polyester bicomponent yarns is desired.

In some embodiments,

A) Melt spinning two or more different composition polyesters from a single pre-coalescent or post-coalescent spinneret to form multiple parallel or eccentric sheath-core polyester bicomponent filaments. Forming;

B) grouping the filaments into two or more threads, each containing more than one filament;

C) winding the yarn at a speed of more than about 300 meters per minute;

D) deadlocking each thread;

E) combining yarns into bundles of yarns; And

F) winding yarn bundles onto the tube core at a speed of greater than about 300 meters per minute, wherein yarn bundles are separable into two or more individual yarns, and the bicomponent filaments are made of poly (trimethylene terephthalate) And at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate) or a combination thereof.

Another embodiment,

A) melt spinning two or more different compositions of polyester from a plurality of pre- or post-union spinnerets in a single spinning position to form a plurality of parallel or eccentric sheath-core polyester bicomponent filaments;

B) dividing the filaments into two or more threads consisting of a plurality of filaments each;

C) winding the yarn at a speed of more than about 300 meters per minute;

D) deadlocking each thread;

E) combining a plurality of groups of two or more threads into a plurality of threads; And

F) winding each thread bundle onto a tube core using a conventional multi-package winder, wherein each thread bundle is separable into two or more threads, and the bicomponent filament is Multi-ends comprising poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or a combination thereof It is a manufacturing method of a package.

Another embodiment,

A) forming at least two yarns from at least two parallel or eccentric sheath-core polyester bicomponent filaments;

B) combining the threads into a bundle of threads; And

C) winding the yarn bundle onto the tube core, wherein the yarn bundle is separable into two or more yarns, the bicomponent filaments being poly (trimethylene terephthalate), poly (ethylene terephthalate), poly (Trimethylene terephthalate) and poly (tetramethylene terephthalate) or a combination thereof, the method of producing a multi-end package, comprising at least one polymer selected from the group consisting of.

Also, a thread bundle comprising two or more threads, each thread comprising a plurality of parallel or eccentric sheath-core polyester bicomponent filaments, the thread bundle being separable into two or more threads, and the bicomponent filaments Yarn bundles comprising poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or combinations thereof Included.

A further embodiment is a multi-end package comprising threaded yarns wound on a tube core, the threaded yarns being separable into two or more threads, each threading a plurality of parallel or eccentric sheath-core polyester bicomponent filaments Wherein, the bicomponent filament is selected from the group consisting of poly (trimethylene terephthalate), poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or a combination thereof It provides a multi-end package containing the above polymer.

1 is a schematic of a spinning and winding system of some embodiments.
2 is a schematic side view of a high speed winder used with the spinning and winding system of some embodiments.
3 is a schematic of the preparation of core-spun polyester bicomponent from a multi-end package.
4 is a schematic diagram of a hollow spindle sheath using polyester bicomponent from a multi-end package.
5 is a schematic of a knitting process using polyester bicomponent from a multi-end package.

It has only been found by the present invention that a package comprising a plurality of ends of a polyester bicomponent filament yarn can be manufactured in a separable manner into a plurality of individual yarns, each of which comprises a plurality of bicomponent filaments at sea-sea. Multi-end packages can be used directly in place of multiple single-ended packages for processes such as beaming, circular knitting, weaving or core spinning, providing convenience and cost savings. The bicomponent filaments comprise poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or combinations thereof do.

For the purposes of the present invention, the following terms are defined below:

POY (partially drawn yarn): A filament yarn having a draw ratio of less than moderate so that only partial longitudinal orientation of the polymer molecules occurs.

FDY (completely stretched yarn): In contrast to POY, a filament yarn having a normal draw ratio such that complete longitudinal orientation of the polymer molecules occurs.

DW (stretched winding): A stretching process of continuous filament yarn for the alignment of molecular and crystal structures. The stretched yarn is wound on parallel tubes or cheeses to form a twistless yarn.

DTY (stretched texture yarn): A filament yarn manufactured by a simultaneous process of stretching to increase molecular orientation and crimping to increase bulkiness.

DT (Texture Textured): In the manufacture of thermoplastic fibers, a simultaneous process of stretching to increase molecular orientation and imparting crimp to increase bulkiness.

Multiple: Having or containing many objects, filaments, threads and ends.

Multifilament: A yarn composed of many continuous filaments or strands, in contrast to a single filament monofilament. Most textile filament yarns are multifilament.

Multicomponent: The fiber consists of more than one polymer. In some embodiments, these polymers are predominantly poly (ethylene terephthalate) (2GT), poly (trimethylene terephthalate) (3GT), and poly (tetramethylene terephthalate) (4GT) or combinations thereof.

Core Spun Yarn: A yarn in which a core is concealed by twisting fibers around a filament. One example is where the core yarn is an elastic yarn (eg 2GT 3GT bicomponent) for obtaining stretch-recovery properties and the twisted fiber is a cotton fiber for obtaining the desired tactile esthetics.

Dimensions suitable for direct use in the manufacture of the core spun yarn: Typically the core yarn for CSY (core spun yarn) is spandex yarn, the package size of which is much smaller than the polyester bicomponent yarn. Thus, when replacing spandex yarn with polyester bicomponent yarns, the creel or space of the CSY device makes it impossible to place one seal package on one spinning position.

Elastomeric Fiber: A synthetic fiber having the properties of natural rubber, such as high stretch and recovery.

Hard yarn: In contrast to elastomeric fibers, synthetic fibers that do not have the properties of natural rubber such as stretch and recovery.

Spandex: An artificial fiber wherein the material forming the fiber is a long chain synthetic polymer composed of at least 85% segmented polyurethane.

As used herein, "bicomponent filaments" generally refer to two polymers of the same class adhering to each other along the length of the fiber such that the fiber cross section is for example a parallel, eccentric sheath-core, or other suitable cross section where useful crimping can occur. Means continuous filament.

As used herein, "side-by-side" means that two components of a bicomponent fiber are directly adjacent to each other, and one component is no more than a small portion inside the recess of the other component. do. As used herein, "eccentric sheath-core" means that one of the two components completely surrounds the other, but the two components are not concentric.

As used herein, "sajo" means a group of two or more bicomponent filaments. Yarn filaments are processed together as a group. As used herein, "end" refers to an individual fiber, yarn or thread. As used herein, "thread" is interchangeable with "end". In conventional fiber spinning and winding processes, typically a single thread is wound on a single tube core to create a "single end" package. Single-ended packages created by conventional procedures are also referred to as "one end per package."

As used herein, “threadline bundle” means two or more threads that are combined together to form one multicomponent thread bundle. Thread bundles remain in such a condition that they can be separated into two or more individual threads (ends). Yarn bundle as used herein also means a yarn consisting of two or more ends.

As used herein, "thread" refers to continuous strands of textile fibers, filaments, or other forms of material suitable for knitting, woven, or other intertwining to form textile fabrics.

As used herein, "multiend package" refers to thread bundles wound on a tube core.

The polyester bicomponent filaments are at least one polymer selected from the group consisting of poly (trimethylene terephthalate), poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or a combination thereof In a weight ratio of about 30:70 to about 70:30. The polymer may be, for example, poly (ethylene terephthalate) and poly (trimethylene terephthalate), or poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or for example poly (trimethylene with different intrinsic viscosity Terephthalate) and poly (trimethylene terephthalate), but other combinations are possible. Alternatively, poly (trimethylene terephthalate) homopolyesters and poly (trimethylene terephthalate) copolyesters can be similar in composition, and optionally also differ in viscosity. Poly (ethylene terephthalate) and poly (tetramethylene terephthalate), or a combination of poly (ethylene terephthalate) and poly (ethylene terephthalate) having different intrinsic viscosity, for example, or poly (ethylene terephthalate) homopolyester and Other polyester bicomponent combinations are also possible, such as poly (ethylene terephthalate) copolyesters. As used herein, the indication "//" is used to separate the two polymers used to make the bicomponent filaments. Thus, for example, “poly (ethylene terephthalate) // poly (trimethylene terephthalate)” refers to a bicomponent filament comprising poly (ethylene terephthalate) and poly (trimethylene terephthalate).

One or both of the polyesters may be copolyesters, and “poly (ethylene terephthalate)”, “poly (tetramethylene terephthalate)”, and “poly (trimethylene terephthalate)” are such copolyesters Meaning to include. For example, the comonomers used to prepare the copolyesters are linear, cyclic, and branched aliphatic dicarboxylic acids (and diesters) of 4 to 12 carbon atoms (e.g. butanediic acid, pentanedic acid) , Hexanediic acid, dodecanediic acid, and 1,4-cyclo-hexanedicarboxylic acid); Aromatic dicarboxylic acids (and diesters thereof) having 8 to 12 carbon atoms and not terephthalic acid (eg, isophthalic acid and 2,6-naphthalenedicarboxylic acid); Linear, cyclic, and branched aliphatic diols having 3 to 8 carbon atoms (eg, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 3-methyl-1,5-pentanediol , 2,2-dimethyl-1,3-propanediol, 2-methyl-1,3-propanediol, and 1,4-cyclohexanediol); And aliphatic and aromatic aliphatic ether glycols having 4 to 10 carbon atoms (eg, poly (ethyleneether) glycols having a molecular weight of less than about 460, including hydroquinone bis (2-hydroxyethyl) ether, or diethyleneether glycol) Copoly (ethylene terephthalate) selected from the group consisting of can be used. Comonomers may be present in a range that does not impair the effects of the present invention, for example at levels of about 0.5 to 15 mole percent, based on the total polymer component. Isophthalic acid, pentanedic acid, hexanediic acid, 1,3-propane diol, and 1,4-butanediol are exemplary comonomers.

The copolyester (s) may also be prepared using small amounts of other comonomers, as long as they do not adversely affect the physical properties of the fibers. Such other comonomers include 5-sodium-sulfoisophthalate, sodium salts of 3- (2-sulfoethyl) hexanediacid, and their dialkyl esters, which are about 0.2 to 5 moles based on the total polyester It may be incorporated in%. For improved acid dyeability, the (co) polyester (s) are also polymeric secondary amine additives, such as poly (6,6'-imino-bishexamethylene terephthalamide), and this and hexamethylenediamine Copolyamides, preferably phosphoric acid and phosphites thereof. Small amounts, for example about 1 to 6 milliequivalents of tri- or tetra-functional comonomers, such as trimellitic acid (including its precursors) or pentaerythritol, can be incorporated for viscosity control.

Polyester bicomponent filaments may also include conventional additives such as antistatic agents, antioxidants, antibacterial agents, flame retardants, lubricants, dyes, light stabilizers, and quenchers such as titanium dioxide, so long as the effects of the present invention are not impaired. Can be.

There is no particular limitation on the external cross-sectional shape of the bicomponent filaments, and it may be non-circular, circular, substantially elliptical, triangular, "snow-eye" and the like. As used herein, "substantially elliptical" means that the cross-sectional area of the filament measured perpendicular to the length axis of the fiber deviates less than about 20% from the area of the ellipse. The general term "oval" is meant to include "oval" (egg-shaped) and "ellipse". Such a shape typically has two perpendicular axes passing through the center of the shape, namely the major axis A and the minor axis B, the length of the major axis A being longer than the length of the minor axis B. In the special case of a perfect ellipse, an ellipse is described as the trajectory of points equal to A whose sum of distances from the two foci is constant. In the more general oval form, one end of the ellipse may be larger than the other end, so the sum of the distances from the two foci is not necessarily constant and may vary by more than 20% from the ellipse. As used herein, a “eye-shaped” cross-sectional shape can be described as a parallel cross section with two or more maximums in the length of the short axis when plotted about the long axis, short axis, and long axis.

The perimeter of the bicomponent filament cross section may or may not have a constant curvature. The cross-sectional shape of the bicomponent filament may or may not have a groove around the cross section. Examples of cross-sectional shapes with grooves are "snowman", "fan oval" and "keyhole".

As used herein, "polymer interface" means the interface between polymers of bicomponent filaments. The polymer interface can be substantially linear or curved. For cross-sectional shapes with long and short axes, the bicomponent filaments can have a polymeric interface that is substantially perpendicular or substantially parallel to the major axis of the cross section.

Bicomponent filaments have a crimping capacity of about 30% to about 90%, for example about 60% to about 80%. The crimp is due to the different shrinkage of the polymers, and the bicomponent fiber is made from different polymers to show the crimp as a result of the different shrinkage rate. Specifically, the crimp is maximized by applying heat to the bicomponent filaments.

Various colors of polyester yarn may be included in some embodiments. Color may be imparted to the polyester by the use of dyes and / or pigments. For example, the black yarn can be made by the addition of carbon black. These additives are generally added to the polymer and mixed together before passing through the spinneret.

FIG. 1 shows a plurality of parallel or eccentric sheath-core polyester bicomponent filaments by melt spinning two or more different polymers 12A and 12B from one pre- or post-polymer spinneret 14. An embodiment of a spinning apparatus 10 for providing a method of making a multi-end package comprising forming is shown. The plurality of seal ends 16a to 16f are each produced to include a plurality of filaments. Finishes may be supplied by the spin finish applicator 19. The seal ends 16a to 16f pass through the quench cabinet 18. The seal end is then drawn at G1 through G3 and may pass through a deadlock 20 comprising pressurized fluid. Two or more of the seal ends are then combined in a converging guide to form a multiend bundle and wound onto the package 28a. These multiend bundles can be separated into the original seal ends.

2 is shown in more detail. Each of 16a and 16b, 16c and 16d, and 16e and 16f combine to form multi-end bundles 24c, 24b and 24a, respectively, which are wound to form multi-end packages 28c and 28b, respectively. And (28a). When the package is placed on the krill and dismissed, two threads are available from each multi-end package. Each of these threads can be moved to a different spinning position for later processing.

The features and advantages of the present invention are more fully shown by the following examples which are provided for purposes of illustration and should not be construed as limiting the invention in any way.

Example

Example  1-55 dtex  And two threads of 34 filaments Multi-end  package

To make a multi-end package consisting of two threads of 55 dtex and 34 filaments, each thread of 68 filaments was made from a single spinneret and split into two threads of 34 filaments each. After that, each thread had 34 filaments. In the spinning device with six spinnerets, six threads were made up of twelve threads in one spinning position.

Each thread (total 12 with 34 filaments each) had its own thread path on rolls and all equipment. All 12 movements were independent. After passing through the deadlock jet, the two threads were converged to one thread by a converging guide, after which the converged threads were wound into a single yarn package by a winding machine. This provided six multi-end packages, each with two ends from thread with 55 dtex and 34 filaments, respectively.

Example  2-27 dtex  And two threads of 17 filaments Multi-end  package

To make a multi-end package consisting of two threads of 27 dtex and 17 filaments each, each thread of 34 filaments was made from a single spinneret and split into two threads of 17 filaments each. After that, each thread had 17 filaments. In the spinning device with six spinnerets, six threads were made up of twelve threads in one spinning position.

Each thread (12 in total with 17 filaments each) had its own thread path on rolls and on all installations. All 12 movements were independent. After passing through the deadlock jet, the two threads were converged to one thread by a converging guide, after which the converged threads were wound into a single yarn package by a winding machine. This provided six multi-end packages, each with two ends from thread with 27 dtex and 17 filaments, respectively.

Example  3-for core spinning Multi-end  package

3 shows a multi-end package 28c for the core spinning process. The yarn is delivered by two transfer rollers 38, whereby the two multicomponent yarns 16a and 16b from the multi-end package 28c are separated and tangentially dismantled up to the roller guide 30, and the roller The guide sends the separated multicomponent yarns 16a and 16b to the front rollers 35 in their corresponding spinning positions, where the polyester multicomponent yarns are combined with staple roving fibers 2 to form a separate core spun yarn package 4 ).

Example  4-hollow spindle cloth for Multi-end  package

4 shows a multi-end package for a hollow spindle coating process. The multi-end package 28 is driven by two transfer rollers 38 so that the two multicomponent yarns 16a and 16b are delivered tangentially to the individual guide eyelets 42 of the corresponding spinning position. Separated multicomponent yarns 16a and 16b separately pass through second transfer roller 40 and then through rotating spindle 44 having a hollow tube in the center and having an inelastic yarn package outer surface 46. The inelastic yarns are loosened by the rotational action of the spindle and wrapped around the multicomponent yarns and wound by the third transfer roller 41 into the coating package 48 for other uses.

Example  5 - Circular  for Multi-end  package

5 shows a multi-end package 28 for circular knitting. The multi-end yarns 16a and 16b on the package 28 are separated at a constant speed by two transfer rollers 38 and delivered up to an individual stop motion device 54 for the corresponding knitting position. Separated yarns 16a and 16b are transferred from roller guide 50 to feeder 52 and to knitting needles 58. Separately, the hard yarn package 60 supplies the hard yarn to the feeding machine 52 by the feed speed adjusting device 56 so that the garment or fabric including the hard yarn and the elastic bicomponent yarn is knitted.

Examples 3, 4, and 5 have devices for driving a multicomponent package at a constant and predetermined speed to transfer the multicomponent yarns in a tangential direction. Drafts of multicomponent yarns, ie the transfer speed of a multi-end package relative to the transfer speed of inelastic yarn, are usually in the range of 1X to 1.2X, typically 1.01X to 1.1X for better processing efficiency.

Having described what is considered to be the preferred embodiments of the invention, those skilled in the art will recognize that modifications and variations thereto may be made without departing from the spirit of the invention, and all such changes and modifications are within the scope of the invention. I would like to lift it.

Claims (28)

A) Multiple side-by-side or eccentric sheaths by melt spinning two or more different polyesters from a single pre-coalescent or post-coalescent spinneret. Forming a core polyester bicomponent filament;
B) grouping the filaments into two or more threadlines, each containing more than one filament;
C) winding the yarn at a speed of more than about 300 meters per minute;
D) deadlocking each thread;
E) combining yarns into bundles of yarns; And
F) winding yarn bundles onto the tube core at a speed of greater than about 300 meters per minute, wherein yarn bundles are separable into two or more individual yarns, and the bicomponent filaments are made of poly (trimethylene terephthalate) A process for producing a multiend package, comprising at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or a combination thereof. . The method of claim 1, further comprising stretching yarn at greater than about 1.2, and winding yarn bundles at a speed of greater than about 420 meters per minute. The method of claim 2, further comprising heat treating the yarn to a temperature of about 100 ° C. to about 200 ° C. 4. A) melt spinning two or more different compositions of polyester from a plurality of pre- or post-union spinnerets in a single spinning position to form a plurality of parallel or eccentric sheath-core polyester bicomponent filaments;
B) dividing the filaments into two or more threads consisting of a plurality of filaments each;
C) winding the yarn at a speed of more than about 300 meters per minute;
D) deadlocking each thread;
E) combining a plurality of groups of two or more threads into a plurality of threads; And
F) winding each thread bundle onto a tube core using a conventional multi-package winder, wherein each thread bundle is separable into two or more threads, and the bicomponent filament is Multi-ends comprising poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or a combination thereof Method of manufacture of the package. The method of claim 4, further comprising stretching yarn at a draw ratio greater than about 1.2 and winding yarn bundles at a speed of greater than about 420 meters per minute. The method of claim 5 further comprising heat treating the yarn to a temperature of about 100 ° C. to about 200 ° C. 7. A) forming at least two yarns from at least two parallel or eccentric sheath-core polyester bicomponent filaments;
B) combining the threads into a bundle of threads; And
C) winding the yarn bundle onto the tube core, wherein the yarn bundle is separable into two or more yarns, the bicomponent filaments being poly (trimethylene terephthalate), poly (ethylene terephthalate), poly A process for producing a multi-end package comprising at least one polymer selected from the group consisting of (trimethylene terephthalate) and poly (tetramethylene terephthalate) or a combination thereof. 8. The method of claim 7, wherein the package has dimensions suitable for use directly in the manufacture of the core spun yarn. 9. The method of claim 8, wherein the package has dimensions that fit the device for core spinning spandex yarn. The method of claim 1, wherein the bicomponent filaments comprise poly (ethylene terephthalate) and poly (trimethylene terephthalate). The method of claim 1, wherein the bicomponent filaments comprise poly (trimethylene terephthalate) and poly (trimethylene terephthalate). The method of claim 1, wherein the bicomponent filaments comprise poly (trimethylene terephthalate) and poly (tetramethylene terephthalate). A thread bundle comprising two or more threads, each thread comprising a plurality of parallel or eccentric sheath-core polyester bicomponent filaments, the thread bundle being separable into two or more threads, and the bicomponent filaments being poly ( Trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate) or a combination thereof. 14. The yarn bundle of claim 13, wherein the filaments have a cross-sectional shape selected from the group consisting of circular, oval or snowman shapes or combinations thereof. The yarn bundle of claim 13, wherein the filaments have a non-circular cross-sectional shape. 14. The yarn bundle of claim 13, wherein the denier of each yarn is about 10 to about 300. 14. The thread bundle of claim 13, wherein the denier per filament is from about 0.50 to about 20. The yarn bundle of claim 13, wherein the yarn has a crimping capacity of at least 30%. 14. The yarn bundle of claim 13, wherein the bicomponent filaments comprise poly (ethylene terephthalate) and poly (trimethylene terephthalate). 14. The yarn bundle of claim 13, wherein the bicomponent filaments comprise poly (trimethylene terephthalate) and poly (trimethylene terephthalate). 14. The yarn bundle of claim 13, wherein the bicomponent filaments comprise poly (trimethylene terephthalate) and poly (tetramethylene terephthalate). A multi-end package comprising threaded bundles wound on a tube core, the threaded bundles being separable into two or more threads, each thread comprising a plurality of parallel or eccentric sheath-core polyester bicomponent filaments, The filament is a multi comprising at least one polymer selected from the group consisting of poly (trimethylene terephthalate), poly (ethylene terephthalate), poly (trimethylene terephthalate) and poly (tetramethylene terephthalate), or a combination thereof End package. 23. The multi-end package of claim 22 having dimensions suitable for direct use in the manufacture of core spun yarn. The multi-end package of claim 22 or 23, wherein the bicomponent filaments comprise poly (ethylene terephthalate) and poly (trimethylene terephthalate). The multi-end package of claim 22 or 23 wherein the bicomponent filaments comprise poly (trimethylene terephthalate) and poly (trimethylene terephthalate). The multi-end package of claim 22 or 23 wherein the bicomponent filaments comprise poly (trimethylene terephthalate) and poly (tetramethylene terephthalate). A multi-end package made by the method of any one of claims 1, 4 and 7. Thread bundles of multi-end packages made by the method of any one of claims 1, 4 and 7.

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