US3500629A

US3500629A - Process for producing a stretch core spun yarn

Info

Publication number: US3500629A
Application number: US599509A
Authority: US
Inventors: David Gliksmann; David W Petree
Original assignee: Burlington Industries Inc
Current assignee: Burlington Industries Inc
Priority date: 1966-12-06
Filing date: 1966-12-06
Publication date: 1970-03-17
Anticipated expiration: 1987-03-17

Description

D. GLIKSMANN ETAL 3,500,629

PROCESS FOR PRODUCING A STRETCH CORE SPUN YARN March 17, 1970 Filed Dec. 6, 1966 n m T M: P w

United States Patent 3,500,629 PROCESS FOR PRODUCING A STRETCH CORE SPUN YARN David Gliksmann, Bronx, N.Y., and David W. Petree, High Point, N.C., assignors to Burlington Industries, Inc., Greensboro, N.C., a corporation of Delaware Filed Dec. 6, 1966, Ser. No. 599,509

Int. Cl. D02g 3/36 US. Cl. 57-144 8 Claims ABSTRACT OF THE DISCLOSURE A process for producing a stretch yarn which coinprises preparing a core spun yarn made up of a core of continuous filament yarn covered with staple fibers and thereafter false twisting said core spun yarn.

The present invention relates to certain improvements in the texturizing or processing of single ends of yarns comprising staple fibers by false twist techniques so as to prepare stretch'yarns. I

Broadly stated, the present invention contemplates (1) preparing a core spun yarn made up of a core of continuous filament yarn covered with staple fibers which may be 100% nonthermoplastic staple, e.g., wool fibers, 100% thermoplastic staple fibers such as nylon or polyester, or blends of nonthermoplastic and thermoplastic staple; and thereafter (2) false twisting the resulting core spun yarn. This false twisting treatment may be carried out using conventional false twisting apparatus v and, for example, the conditions employed in Ser. No. 423,256, filed Jan. 4, 1965, now US. Patent No. 3,289,401, the subject matter of which is incorporated herein by reference.

The use of a filament core yarn as proposed herein offers a number of important advantages for the preparation of textured or stretch yarns from staple yarns. For example, the filament yarn adds strength to the staple yarns and thus facilitates processing as the core spun yarn is subjected to the twisting, heat setting and untwisting steps of the false twisting operation. This added strength makes it possible to effectively work with staple fibers of various lengths, whether short long.

The continuous filament core used herein can be of any conventional type, e.g., nylon, polyester, acrylic or the like as long as it has suitable shrinkage characteristics and enough strength to support the staple fibers for the false twisting. While a nonthermoplastic filament core can be used and will give a satisfactory stretch yarn after false twisting, thermoplastic filament core yarns add even more desirable stretch properties and are preferred. In either case, the core which is used may be a monofilament or multifilament yarn.

It will be realized that the stretch yarn of the invention may be used as such to prepare woven or knitted fabrics of varying constructions. The yarn may also be plied with another stretch yarn, which may have the same or different composition and construction. Similarly, multiple ends of the core spun yarn may be plied together for false twisting with advantage. However, it will be appreciated that the effective processing of single ends according to the invention is of particular importance since the amount of labor and waste material is very substantially reduced from prior techniques involving the processing of single ends.

The invention is illustrated by the following:

A core of preferably fine;v denier, continuous filament 10-15 denier monofilament nylon yarn), is inserted into a conventional spinning frame directly behind the front roll. where the continuous. filament yarn is united with staplefibers (e.g., wool fibers, a 40:60% blend with polyester staple orlothertype blend, as described in the above-mentioned Ser. No'. 423,256) which are being drafted in the draft zone to the desired weight or count. It is important that proper tension (e.g., 5-20 grams) be applied to the filament yarn-in order for the filament to be in a firm position with respect to the staple fibers. For best results, the filament, in the case of double roving, shouldvbe in the center of the two rovings. However, when: using single roving, the filament should be on the left side of the roving for Z twist yarn and on the right side for the S yarns for the best coverage with staple fibers. This method reduces grin-through of the filament core.

After the yarn is spun, it is conditioned on a spinning bobbin (e.g., at a dry bulb temperature of 8090 C. and a wet bulb of 7080 C.) for sixty minutes to set the yarn and reduce the tendency to kink in the texturizing process that follows. The yarn after conditioning is then wound on a cone ready for the texturizing or false twist/heat-set process. As the yarn is unwound off the cone, it is laced through a series of tension devices for proper tension, then through the heat-set chamber at a temperature of around -245 C. at a speed of about 10-70 yards/minute with a heat exposure time of about 0.2 second to 5.0 seconds per linear inch of yarn. From the heater element,-yarn is fed into the false twist rotor which usually revolves at a speed of between 20,000 and 150,000 r.p.m. From the false twist spindle, the yarn is wound onto a takeup package ready for use.

The drawings attached hereto illustrate diagrammatically the preparation of the core spun yarn (FIGURE 1) and the false twisting or texturizing of the core spun yarn (FIGURE 2).

According to FIGURE 1, the filament core yarn 2 is fed from an appropriate supply 3 through tension guides 4 into the staple fibers 6 behind the front rolls 8 of a conventional spinning frame F. The staple fibers 6 are drafted in zone '10 of the spinning frame and the resulting core spun yarn 11 is taken up in usual fashion on the spinning bobbin 12. Following conditioning as aforesaid, the yarn is ready for the false twisting operation which, according to the embodiment shown in FIGURE 2, involves passing the spun core yarn 11 from its package 14 through a centering eye 16, to tensioning means 18, and overfeed roll 20. From the roll 20, the yarn is passed through the heat-set chamber or heating zone 22, false twist rotor 24, and traverse guide 26 onto takeup package 28. The resulting stretch yarn may then be used as desired in weaving fabric or otherwise.

Having described the invention, what is claimed as new is:

1. A process for producing a stretch yarn which comprises preparing a core spun yarn made up of a core of continuous filament yarn covered with staple fibers in a uniform way without dimensional decorative effects, and thereafter false twisting and heat setting said core spun yarn.

2. The process of claim 1 wherein the continuous filament corn yarn is thermoplastic.

3. The process of claim 2 wherein thestaple fibers comprise nonthermoplastic fibers.

6. The stretch yarn obtained by the process of claim 1.

7. The stretch yarn of claim 6 wherein said core is overed with nonthermoplastic staple fibers.

8. A process according to claim ,1 wherein the core pun yarn is prepared by inserting a 10-15 denier monolament nylon yarn into a roving of staple wool fibers as aid fibers are being drafted on a spinning frame, after ihich the resulting core spun yarn is taken up On a spining bobbin, conditioned and then subjected to false wisting.

References Cited UNITED STATES PATENTS Breen et al 57-139 Stoddard et a1. 57-l56 Baebler 57140 Gliksmann et a1 2872 Rapoza 57---144 XR Gliksmann et al. 57-157 Reid et al. 57163 Fairley 57 15.7 XR

US. Cl. X.R.