DE1435351A1 - Method for stretching and curling synthetic threads - Google Patents

Description

DR.-IN &. H. MnwM «· -.« «-

DIPL.-INO. H. BOH «MÖLLewemβι

DIPL-ING. S. STAiGER J g JQM 1SS3

M 19 273

c »b. 527 U3S35T

Description of the patronage

the company BRITISH UYLON SPINNERS, Pontypool, Monmouthshire, England

concerning

"Method of stretching and curling of synthetic threads "

Priorities: June 26, 1962 - Great Britain

The invention relates to improvements in stretching and crimping · of synthetic threads and urine.

Synthetic threads «earth through the openings of a spinneret aohBelsgeeponnen or spun from solutions and then normal- «Ei ·· wound up on cylinders, supply reels did catfish -bundles for sole-less processing stages, such as stretching, provide.

Bas stretching referring to the pulling of synthetic threads will «awaken an increase in the strength of the same on the basis of a Molecular orientation carried out Normally a dorelike stretching, for example in the case of polyamide, polyester - and Poly ac rylni tr ilia den, carried out between two pairs of Rollnn or orphaned, the second pair with one

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The circumferential speed rotates, which is M ohr times (depending on the desired stretching ratio) that of the first panorama. If necessary, heat can be applied to the thread between the pairs of rollers to support the stretching and the stretching «lie (point of draw).

Nowadays, synthetic threads or yarns are often also subjected to a bulking treatment, such as edge crimping, in a housing (stuffer box crimping), twist crimping or compression with air turbulence bulking, subject. Generally speaking, it is necessary for the threads or yarns to be heated at the same time as the upsetting treatment so that the deformation effect is sufficiently pronounced and the deformed state of the threads or yarns some degree of permanence is conferred.

Ee was found in Applicant's British Patent 852 579 suggested combining stretching with a compression treatment in the form of a crimp with false twist (false-twist crispins) asu * In that procedure, none is used to induce fixation (setting) sufficient l & xme applied.

It has now been found to be a very convenient procedure for the combined stretching and upsetting of synthetic endless (continuous) threads consists in the fact that such a yarn is not stretched state at a fixed speed to pressure rollers or holding rollers of a housing curler (stuffer-box crimper), which pressure rollers or

• 909841/138 *. ,.

wise halting whales are rotated at a peripheral speed, which is at least twice the linear velocity, with which the yarn is conveyed there so that the yarn is drawn, the conditions of the process being such that the la yarn through the stretching and immediately following The heat generated by puckering is sufficient to reduce the heat imparted to the yarn To fix the crimp without damaging it.

By "fixing · ¹ of the (repaired is understood that the KxBuselung 1st by a resistance or durability, the sufficient" However least to the mechanical effects to 'resist any subsequent processing of the yarn, and usually fixation is a standard fixation treatment equivalent in steam. "Yarn * includes all single-thread and full-thread structures of textiles.

In order for the conditions of the procedure to lead to the development of only as much V & me as is sufficient, it may be necessary to create a Heating device, such as "a hol" en extension (snubbing pin), Kwischenauschalten, among other things the Streokstelle between the transport devices and the pressure rollers, that is above the latter, set, wherein the yarns are wrapped or laced (laoed) around or through said device in order to ensure that some stretching heat is consumed respectively is diverted before they get to the pressure rollers. In addition, variables such as the amount of moisture on and in the threads or yarns and the drawing speed of the same have although no minimum values are to be prescribed for these in the procedure have an effect on the shape dimensions produced. Of course, by the degree of stretch to which the yarns are subjected

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greatest effect brought about; the higher the stretching ratio achieved, the greater the m / poor amount produced. The closer the stretching point is to the roller gap of the pressure rollers, the greater and more immediate the heat effect within the krailer.

The preferred housing curled egg for use in the invention Method is because of the simple controlled nature of its devices for dispensing the crimped threads respectively Yarns one which, apart from the pressure rollers, consists exclusively of a driven discharge wheel, whose Axis is perpendicular to the axes of the pressure rollers and its Circumference deeply engages in the roller gap between the pressure rollers on the delivery side of the same. Ih such a housing ™ frizz oiler, which is described in British patent specification 873,368 is, the delivery speed of the crimped yarn is controllable in relation to the feed speed, so that the crimp frequency in the yarn is chosen and maintained uniformly can be. Since the pressure rollers are known as Stretching rollers are used, it is essential that they are strengthened on the threads or yarns both in terms of their speed as well as the pressure exerted on each other is uniform. Such a pressure, for example 13.6 kg (30 pounds) for a multi-ply nylon yarn of 1,040 denier, can be used in known Way to be set. Although there may be some slip between the rollers, it is only acceptable if it is uniform occurs.

The stretching can according to the invention either during the continuous Transport of the threads or yarns from the spinning machine or as a separate process from spinning.

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Find.

. In the following, an embodiment according to the invention is under Described with reference to the accompanying drawings, wherein Figure 1 is a perspective view of a device according to the mentioned execution and

Figure 2 is a schematic sectional view of the housing curler

of Figure 1
is.

In this embodiment, unstretched multi-filament yarn (i), for example polyhexamethylene adipamide, is inevitably drawn off by feed rolls (3) from a spinning cylinder bobbin or a spinning cylinder bundle (not shown) Centimeters above the bolt gap of the pressure rollers (7) or (9) of a housing crimper of the preferred type mentioned above is passed. The pressure rollers of the Kräuaelera are made of corrosion-resistant or stainless steel and have a diameter of 25.4 ram (1 inch) Figure 2) is a brass disc with a diameter of 101.6 mm (4 inches) and a width of 1.59 mm (-fä inch). Both the pressure rollers and the delivery wheel are driven by devices not shown; the drive speed of the delivery wheel is considerably lower than that of the pressure rollers, which is responsible for the shortening or compression of the yarn when it assumes its crimped shape (15). Such a

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crimped yarn is through. Rollers (17) withdrawn.

In this version ofο rm 1 040 denier / 15 denier per ... Filament yarns from Polyhexajnethylenadipamid, whose Threads had a trilobal (trilobal) cross-section, stretched with success with a stretch ratio of 4 and with 152.4 m / ltfinute (500 feet per minute), with the peripheral speed the printing roll was like this. In a similar way, 420 denier / 6 denier per thread of polyhexamethylene adipamide again with. Filaments of trilobal cross-section drawn at a draw ratio greater than 4 and crimped at 76.2 m / minute (250 feet per minute). In the former case, the yarns were suitable for use as a pile of tufted carpets and in the latter case the yarns were suitable for use in knitted lingerie.

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909841/1384 claims

Claims (3)

- 7 claims U35351 1) A method of stretching and compressing of yarns, load of synthetic endless ,, wherein a yarn of such threads having a predetermined linear velocity continuously conveyed and is gestrecict at a linear velocity which is at least that is two times said predetermined speed, followed immediately by then the drawn yarn is crimped and the crimp of the same is fixed, characterized in that the stretching is carried out by the pressure rollers of a housing crimper and the fixing of the crimp within the crimping element is brought about by the heat generated by the stretching and crimping. 2) Ancestors according to claim 1, characterized in that the excess Täiine generated by the stretching by Reibungsvorriohtungen which localize the stretching point above the pressure rollers, consumed or derived. 3) Method according to claim 1 or 2, characterized in that one the crimped yarn from the aforementioned frilled egg with a controlled! Speed inevitably subtracts. PATfNTAMWXlTe NL4K0. H. WHCKE, DIH ..- ING. H. BOH * DIKING. S. STAEGa ORIGINAL BATH 909841/1384 8th
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