DE2537680A1 - Roving mfg. process - imposes false twist on sliver before winding a filament round it - Google Patents

Abstract

At least one of the fibres wound round in a filament yarn. The silver of 1,000-30,000 dtex. is wound round with a filament of 50 dtex. and a shear stretch 50% at 20-300 coils per metre, while the silver is advanced at a speed >50 metres/mins. The sliver is given a false twist during its passage between the feed cylinder and the winding station. The process delivers a roving which gives a trouble-free spinning, in a mfg. stage which is technically simple and allows high-speed working.

Description

Method of making a roving Addendum to patent. ... ... (Patent application P 24 47 715.4) The invention relates to the production of a roving yarn from a sliver of staple fibers and at least one winding around the staple fibers Filament yarn according to German patent application P 24 47 715.4.

Rovings are preproducts in the manufacture of spun fiber yarn. Spun fiber yarns are produced on spinning machines, mostly ring spinning machines. In recent times, however, the open-end spinning process has also been gaining ground, especially for production coarse yarns in importance. In the manufacture of spun fiber yarn, rovings are predominantly used from fine slivers, which on the spinning machine to the desired fineness are warped and then usually solidified by turning. A roving aside of very strong slivers, e.g. card slivers, must be slightly solidified so that on the one hand it can cope with the mechanical requirements on the spinning machine, On the other hand, it must not be too solidified, so that the warping and the The aim of this is to achieve a uniform refinement of the yarn in the drafting process in the spinning machine becomes possible at all and runs smoothly.

The mechanical consolidation of the rovings has so far either taken place by applying a real twist to the sliver, e.g. on the flyer, or through Applying a rotation in alternating directions by means of a Nitschel device, of a finisher. The amount of rotations applied is the mechanical Determines the strength of the roving, By necessity; one Giving yarn twist becomes the maximum speed in roving production limited. Depending on the fineness of the roving and the length of the staple, the sliver or roving delivery speed during its production between t0 and 100 m / t.rin. Both the flyer direction and a Nitschel plant are technically relatively complex Devices.

Because of expensive machinery and low production rates therefore the economy of conventional spun yarn production is strong burdened.

It is also known to use fiber ribbons by winding them in a spiral to solidify one or more threads. For example, in U.S. Patent 1,732,592, a Machine described, which is used to produce weak or short yarns Fibers particularly suitable, with fiber ribbons initially with one or more threads be wrapped in a spiral and then the assembled yarns a rotation is granted. For the production of the yarns are used for the winding thread but filaments are used which are suitable to give the finished yarn a high strength to rent. Yarn structures of this type are, however, because of their construction and in particular because of the resulting high strength in spun yarn production completely unusable as roving.

From US-PS 2,449,595 a reinforced plastic material is known, which contains a fabric as reinforcement, which is relatively yarns in the warp direction large diameter made of fiber ribbons wound with threads in a spiral, has to hold the individual fibers of the slivers together. But also this The yarn used here as warp threads can because of its construction and its high Strength cannot be used as a roving in spun yarn manufacture.

The object of the present invention is to provide a roving to ask that does not have the disadvantages shown has, itself Can be produced without great technical effort and its structure and properties problem-free spinning into staple fiber yarns is permitted.

Another purpose of the invention is to show a method with which it is possible to produce spun fiber yarns with little technical effort with large Establish working speed.

This object has been achieved with a method for producing a Roving according to the patent t ... ... (patent application P 24 47 715.4) by winding an unconsolidated sliver with a total denier of 1000 to 30,000 dtex, preferably 2500 to 15,000 dtex with a filament yarn that has an elongation at break smaller than 50%, preferably less than 25% and a titer of less than 50 dtex, preferably less than 15 dtex, with 20-300 turns on the sliver, preferably 30 to 100 turns per meter are applied and wherein the sliver when wrapping in the axial direction, a speed of over 50, preferably has over 100 meters per minute. The method according to the invention draws sici as a result, -that the sliver has a false twist between the delivery cylinder and the winding point is granted.

The yarn according to the invention is suitable for producing fine yarn with titers from 20 to 5,000 dtex. The use of the roving according to the invention however, it is not limited to processing on fine spinning machines, it can also the coarse, medium, fine flyer or other hi-machines that produce roving, be submitted.

The roving according to the invention consists essentially of one Sliver of varallelized Stspalfibres and a number of the sliver spirally encircling fine-denier filament yarns together.

The sliver, the main component of the roving, consists of spinnable Natural or man-made fibers, such as wool, cotton, rayon or synthetic fibers, are preferred made of polyester, polyamide, polyacrylonitrile, polyolefin or polyurethane.

The production of the sliver is carried out in a conventional manner the worsted, carded or cotton spinning process.

It is delivered from a drafting system during the production of the roving.

The Finzeltiter of the fibers is between 0.5 dtex and 100 dtex, vorztgsmeise between 1 dtex and 20 dtex. The staple length of the fibers is 5 to 500 mm, preferably 29 to 150 mm, very particularly preferably 35 to 150 mm.

The strength of the roving or sliver depends on the The titer of the yarn that is to be spun from the roving and is between 1 000 dtex and 30,000 dtex, preferably 2,500 dtex and 15,000 dtex. The amount of the Delay on the spinning machines is limited. It is between about 5 and 300 times, mostly however between 20 and 50-fold, this means that the roving depending on the desired End yarn count must not exceed a certain thickness.

The consolidation according to the invention of the unconsolidated sliver in unconventional way is not by twisting, but by spiraling Looping around the sliver with one or more filament yarns, preferably monofi le Filamentgalne, which hold the sliver together and give it his strength To give. The spirals of the filament yarns can be arranged in the same direction. Preferred are 2 filament yarns, which are arranged in opposite directions or crossed over each other are.

It is particularly useful to place the sliver between the exit from the delivery cylinder of the drafting system, at the point where it is from the filament yarn will turn over to give a false twist. Due to this false twist, the Edge fibers of the sliver running somewhat broadly in the drafting system are particularly integrated and the roving becomes rounder. In addition, the sliver gets between the delivery cylinder and winding point a better cohesion.

The sliver is 20 to 300 times per meter of the filament yarn or the Filament yarns wrapped around, whereby the number of turns is the sum of the turns if necessary all wrapping filament yarns.

The filament winding yarns have a denier lower than alc 50 d, preferably lower than 15 dtex. It is based on Ser strength or according to the required or desired mechanical properties of the roving. It is important that the tenacity of the roving, which is expressed in liaft length is, between 15 and 500 meters, preferably 30 and 300 meters. The length of detention is the length of the roving that is still self-supporting.

»The length of the detention must not be too long, otherwise the delay in the The drafting system of the spinning machines is adversely affected, it must not be too low, otherwise the roving will slide apart when it is pulled off the roving spool and what either leads to roving breaks or incorrect drafts. If the wrapping yarn is a multifilament yarn, The single titer of the., iultfilamentgarnes can match the titer of the fibers of the sliver be aligned. On the other hand, it has been shown that in the finished fine yarn different Titer the appearance of the goods as good as not negatively influenced.

The elongation at break of the filament yarn is less than So », preferably less than 25%. A relatively low elongation of the filament yarn is advantageous, so that it is torn at short intervals in the drafting system of the fine spinx machine.

The elongation and tear strength are determined in accordance with DIN 53 834 (Tensile test on yarns and threads).

The filament yarns consist of regenerated or synthetic man-made fiber raw materials such as polyester, polyamide, polyacrylonitrile, polyolefin or cellulose. Normally the very low proportion of untwisted filament in the finished yarn interferes with the failure of the goods not, with extreme color combinations e.g.

but it may be necessary to make the wrapping thread from one material to choose that dyes with the same dye classes as the staple fibers.

For wrapping the unconsolidated sliver with the filament yarn or There are various options for filament yarns.

For example, the filament yarn can be on small spools of small diameter are applied, then it is withdrawn from the fixed spool and put together pulled with the sliver through the bobbin axis, the sliver from Filament yarn is wound, and the number of turns pulled from the bobbin corresponds to the number of turns applied to the sliver. Preferred 2 units of this type are connected in series.

In principle, it is also possible to use only the unconsolidated sliver through the bobbin axis and the winding process behind the filament yarn bobbin to lay. The winding point must be determined by a suitable thread guide will.

These designs are particularly simple as they have no rotating parts contain. However, the unconsolidated sliver can also be wound around that the bobbin with the filament yarn is set in rotation by a drive, while the sliver with the filament yarn through the axis of the filament yarn bobbin is passed through. Here, too, it is of course possible to use the filament yarn to unite with the sliver only after the bobbin. With this Uravinde device larger spools of filament yarn can be used.

Is the winding process under such tension of the filament yarn made that it lies more in the soul of the roving association, it will be with Warping process on the spinning machine easily torn.

As the winding of the unconsolidated sliver with the filament yarn Illit very high speed is possible, the delivery speed of the Roving in its production only by the running speed of the sliver delivering Strecverkes limited.

The wrapped roving can be greuzspulen in a known manner be wound up. In a preferred embodiment, however, it can also be in cans put down. It is fed to the spinning machine and in a conventional one Drafting system refined. The filament yarns are torn in the process.

The spinning process is more trouble-free, the lower the elongation of the winding filament yarn and the finer the denier of the filament yarns will. It has been shown that rovings with monofilaments, which have a lower titer than 15 dtex and whose elongation is less than 25% on modern, heavy-duty Drafting systems can be processed smoothly.

In the case of low stressed stretching cams, it may be necessary to use the feed cylinder to embrace once.

The roving according to the invention is eminently suitable for production of spun yarn.

The invention is to be explained further on the basis of the following examples will.

Example 1: From a mixture of 55% polyethylene terephthalate fibers dtex 3.6 M / 75 S (= mixed titre of 75% by weight dtex 3.3 and 25% by weight dtex 4.0) and 45 r wool 21.5 / u, a roving with a thickness of 5900 dtex was produced at the finisher. The sliver of the appropriate thickness was not nitled, but with a 2 Polyethylene terephthalate monofilaments dtex 10, tensile strength 39 p, elongation at break 6.4% crosswise non-round. The sliver was passed through a tube of the diameter 12 mm passed through; The tube was wrapped with 2 packs of the tonofilament, wherein the monofilament of the one package together with the sliver through the tube was drawn and the monofilament of the second package after the exit of the once with monofilament umvmndenen sliver from the tube the sliver in one of the first turn in the opposite direction. The roving delivery speed was 70 meters per minute.

The roving thus produced was of each monofilament per meter Wound around 26.5 times. For one meter of roving, there were a total of 53 turns. Its tear strength was 145 p and thus the detention length was 26 m. The roving was on spun into a long staple ring spinning machine into 250 dtex yarn. The number the thread breakage was normal, as was the yarn evenness.

Example 2: Made of 100% polyethylene terephthalate edtex 3.3 / 60 mm A roving with a thickness of 4,000 dtex was also produced at the finisher. The sliver was not nitled, but rather 2 polyester monofilaments dtex 10, Tear strength 39 p, elongation at break 6.4% mouth crosswise. The sliver was there passed through a tube with a diameter of 8 mm. The tube came with 2 packs of the monofilament, with the ZIonofilament of the one pack together was pulled through the tube with the sliver and the monofilament the second Packing after the exit of the sliver wound with monofilament the tube walled this in a direction opposite to the first turn.

The roving thus produced was of each monofilament per meter Wound around 40 times. Accordingly, there were eo turns for every meter of roving.

Its tear strength was 108 p and thus the detention length was 270 m.

The roving was turned into yarn on a short staple ring spinning machine StazXe 25n dtex spun. The number of yarn breaks was normal, as was the yarn evenness.

Example 3: From a mixture of 65% polyethylene terephthalate fibers dtex 3.3 / 38 mm and 35% rayon dtex 1.7 / 38 mm became a roving on the cotton flyer of thickness 4,000 dtex.

The sliver was not twisted, but with 2 poly-ethylene terephthalate monofilaments dtex 10, tensile strength 39 p, elongation at break 6.4%, wound crosswise. The sliver was passed through a tube with a diameter of 8 mm. The pipe was with 2 packs of monofilament wrapped around, with the monofilament of one pack was pulled through the tube together with the sliver and the monofilament of the second pack after the exit of the sliver wound with monofilament the sliver from the tube in a direction opposite to the first turn Expenditure. The roving delivery speed was 120 meters per minute.

The roving thus produced was of each monofilament per meter Turn over 40 times. Its tear strength was 98 p and thus the detention would be 245 m a meter of roving was accordingly a total of Bo turns. The roving was Spun on a short staple n.inbspinning machine into 250 dtex yarn.

The number of yarn breaks was normal, as was the yarn evenness.

Figures 1 and 2 represent rovings according to the invention 1 the staple fibers and 2 the wrapping filament. Figure 3 shows schematically the in Example 4 used device for producing the roving with application of a False twist on the sliver between the delivery cylinder and the wrapping point.

Example 4: Made of 100% polyethylene terephthalate fibers dtex 1.7 / 38 mm A roving with a thickness of 6700 dtex was produced at the finisher. The sliver was made not nibbled, but with 1 (one) polyester monofilament dtex 10, tear resistance 3.3 g / dtex, elongation at break 7.5% wound around. FIG. 3 shows schematically that for wrapping experimental equipment used for the roving. The one from the outlet cylinder pair 3 Drafting system supplied fiber sliver 4, consisting of staple fibers, is through the Pipe 6 rotatably mounted in holder 5 and guided via traverser 7 onto sleeve 8 wound to form the cheese 9, driven by the support roller 10.

Tube 6 rotates at a defined speed, driven by a disk 11 and V-belt 12, the sliver 4 being carried by one from the drafting system of the carded yarn spinning machine known element 13 between outlet point A and outlet point A 'false wire for Solidification and rounding is granted. The spool 14 is attached to the tube 6 firmly connected as a carrier of the Umwindefilaments 2, so that by withdrawal from the co-rotating coil 14 places filament 2 at winding point W around fiber sliver 4 and this solidified.

The balloon limiter 15 attached to the spool 14 controls tension and trouble-free running of the winding filament 2. In the example, the sliver delivery speed was 71 meters per minute. The winding filament wrapped around the fiber sliver 45 times per meter. Its tear strength was 10.9 g, the adhesive length 157 m with dtex 6809 roving fineness. The roving became one on a ring spinning machine with a drafting system for short fibers Yarn the Thickness 220 dtex spun with the usual number of thread breaks. Yarn strength, elongation and evenness were normal and corresponded to the values a yarn spun from normally twisted flyer yarn.

Claims (1)

PATENT CLAIM Method for producing a yarn from a sliver of staple fibers and at least one filament yarn wrapping around the staple fibers according to the method of the German patent. ... ... (German patent application P 24 47 715.4) by winding around an unconsolidated Sliver with a total denier of 1000 to 30,000 dtex, preferably 2500 to 15,000 dtex with a filament yarn that has an elongation at break of less than 50%, preferably has less than 25% and a titer of less than 50 dtex, preferably less than 15dtex, with 20-300 turns, preferably 30-100 Windings per meter are applied and the sliver is wrapped around in the axial direction a speed of over 50, preferably over 100 meters per minute, characterized in that the sliver between delivery cylinder and a false twist is given.