DE6601886U - DEVICE FOR DIVIDING A FIBER WEB OBTAINED BY OPENING AND SPREADING A FIBER HANK DURING YARN PRODUCTION - Google Patents

Description

PATENT LAWYERS

DR.-ING.VON KREISLER DR.-1 NG. SCHÖNWALD DR.-ING. TH. MEYER DR. FUES DIPL.-CHEM. ALEK VON KREISLER DJPL.-CHEM. CAROLA KELLER DR.-ING. KLÖPSCH

COLOGNE 1, JEICHMANNHAUS

Elimination III from C 12 472/8 h Gbm

January 17, 1969 Ke / st.- Br.

Celanese Corporation of America,

522 Fifth Avenue, New York, M.Y. Ioo36, (V. St.A.).

Device sum dividing one by opening and spreading a fiber strand obtained at

Web or sheet-like, made of continuous filaments or staple fibers Products made without weaving or knitting are usually referred to as nonwovens and can be used as a filter or in the manufacture of clothing, as padding and reinforcement for these Clothing to be used.

A web of continuous thread can be produced, for example, by using a crimped fiber strand made of synthetic continuous threads is first opened, whereby the position of the individual threads is changed become that their crimps no longer match those of the neighboring threads. Afterward the opened strand is then under the action of external forces that separate the individual threads from each other move away ', preferably spread out by means of air. The basic principle when opening the fiber strand is in that the in ^ in direction moving fiber scang at least between a pair of

Rolls is passed through, of which at least one Do not roll a smooth surface, but an interrupted surface possesses, so that the individual threads of the strand are not continuously, but alternately detected by the roller and then are released again and during this release of one thread grasps other threads of the strand and then can also be released again. At the same time, this ensures the synchronization of the previous crimps of the strand eliminated. The basic principle when spreading the opened cord is that over the entire Width of the strand forces act in the catfish that at least one force resultant the individual threads of the opened strand moved away from each other.

When the opened cord is spread out, it becomes a coherent web of greater width and remarkable density. Preferably the opened Strand to 1.5 to 6 times its original width spread out, with sheets 2 meters or more wide can be obtained, but is for most Applications a web width of up to 1 meter is sufficient.

In the webs obtained in the described manner, all the continuous threads run in the longitudinal direction of the web in the same direction. But if you look at the individual crimps of a single thread, you can see that the Parts of the thread do not run in this general longitudinal direction, but in a zigzag back and forth across the direction general direction. The crimps have such an amplitude that the part called the crest of the crimp of the single thread covers one or more adjacent threads, while the part called the valley of the crimp covers one or more adjacent threads on the other side. This contributes to the cohesion of the railways.

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These fiber webs are particularly suitable for the production of yarns. The web is here in a series of narrow ones Ribbons containing the desired number of threads divided. From a web containing 50 cellulose acetate threads per cm of width of 5 denier, for example, yarns of 64o denier can be obtained by making narrow ribbons of 2.5 cm width and if necessary twisted, to round it off.

The invention now relates to a device for dividing a crimped pas strand made of continuous filaments while eliminating the synchronism of the crimps by opening and spreading the obtained paserbahn during yarn production and is characterized by at least one fixed and rotatable perpendicular to the plane of the paserbane, the paserbahn in the longitudinal direction dividing knife disc (1) and through at least one to this knife disc in Metallic, electrically heatable separating element 5 * 6 arranged in alignment with the direction of movement of the paserbane.

The apparatus has proven particularly useful in fiber webs whose threads> calculated as acetic acid, are made of polyethylene terephthalate or Cellu3oseacetat with the usual Aeetylgehalt of for example 5 ¹ I to 55%; however, it is equally suitable for fiber webs made from other polyesters, for example polyesters of terephthalic acid with other glycols, linear superpolyamides, polyacrylonitrile and copolymers of acrylonitrile, olefinic polymers and copolymers, esters and / or ethers of cellulose, for example cellulose propionate and cellulose acetate esterified cellulose, which contains less than 0.29 free hydroxyl groups per anhydroglucose unit, such as cellulose triacetate, as well as rayon (regenerated cellulose) 25, for example from 1

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to 20. The number of crimps per centimeter of the strand can be up to about 50, which is preferred 1 to 20, especially 1 to 8 crimps.

The device is described below in connection with Drawing (Pig. 1) explained in more detail, while Fig. 2 describes the yarn production. A roller 2 with a cylindrical Circumferential surface made up of several juxtaposed There is knife disks 1, the burrs 5 of the Cutting disks forming V-shaped annular grooves 4 with the connection points of the cutting disks is a separating element 5

downstream, which consists of a number of spaced in front of each other electrically heated wires 6, the effective parts of which engage in the web. The fiber web emerging from an air spreader 7 is drawn through this slot zone by means of a pair of rollers 10, 11, which are expediently driven at a circumferential speed of 5% greater than that of the rollers 8, 9. The web sections formed run apart from the roller via guide eyes 12, which are arranged far apart, and are taken up on reels 18 in ring spinners 19 of the usual type after they have passed through conveyor rollers 15, 14, fixed guides 15 and movable runners 16 in ring rails 17.

The yarn obtained in this way is very voluminous. Its strength corresponds essentially to that of a yarn made of continuous threads, however, it has the appearance of a staple fiber yarn and an extremely soft, pleasant feel.

Claims (2)

Protection claims 1.) Device for splitting one out of a ruffled Fiber strand obtained from continuous filaments by eliminating the synchronism of the crimps by opening and spreading them Fa-serbahn be3. der Gamiiersfcellyng = marked by at least one fixed and rotatable perpendicular to the plane of the fiber web, the fiber web in Knife disk (1) dividing longitudinal direction and through at least one knife disk to this knife disk in the direction of movement Metallic, electrically heatable separating element (5, 6) * arranged in line with the fiber web 2.) Device according to claim 1, characterized in that several knife disks (1) arranged side by side and combined to form a roller (2) with a cylindrical longitudinal surface are, the ridges (5) of the cutter disks with the connection points of the cutter disks V-shaped annular grooves (4) form.