DE2141232B2 - METHOD OF HEAT SHRINKING CONTINUOUS THREAD YARN UNDER LOW TENSION - Google Patents

Description

If the surface experiences a crimp, the FR-PS roller is too high to keep the yarn a high 67 295 (addition to 11 00 529). To give this curling power as well,
two known methods could not provide any stimulus. B. to the method of the US-PS for the solution of the present problem to 32 44 785, in which a sheath core yarn after averaging, since the arrangement of a baffle directly 5 passage through a heat treatment chamber bar behind a gas nozzle, from which the thread is pulled through an eyelet at high speed, where it exits a sharp speed, in the case of a multi-thread change of direction, before it is wound up to the yarn package inevitably to mutual confusion. In order to conduct the procedure under lower threads. To be able to carry out tension, the conveying-From US-PS 30 43 088 is a method for the speed of the yarn not much more than 500 m / production of bulky yarn known, in which the min, and it is therefore not possible to connect the yarn directly to the spinning of the yarn by passing it through a vortex nozzle and immediately impinging on one in a yarn thread. Rather, the yarn has to be wound up at a distance of 3 mm behind the vortex nozzle, in order to then be fed with a lot of vertical baffle plates ir: a tangle of ring-like 15 lower speed than the spinning-speed loops with protruding fiber ends being heat-treated and then wound up again. Such treatment would be im

contradict the task set in the present case. The invention is based on the object of providing a method of heat shrinking by means of a drive for heat shrinking of continuous filament hot gas, that from the heating yarns 20 has to make available the yarn emerging at a lower chamber tine impulse, the tension with the tension must be carried out at such a high speed before the yarn can become a direction that it can be experienced immediately with the change in a yarn guide element, a roller spinning the yarn threads into a single composite or the like. Otherwise, it is necessary to combine methods without the threads needing to change direction (and the associated 25 need to be wound up in the meantime).
Change in the momentum vector) the application of a. This object is achieved with the tension defined at the beginning in order to hold the yarn in its guide element or method according to the invention by keeping it on the roller. In order to avoid the use of - one to the yarn on the first free path with a high tension tension, the point at a speed of more than 914 m / min, the yarn on which the change of direction takes place is usually the first free path in the substantially perpendicular to the distance from the outlet of the heating chamber, so that in the case of a smooth, fixed surface which, in a passage of the yarn: through the surrounding air, the distance from 7.6 to 40.6 cm behind the heat-treated dissipates most of the yarn impulse is located before lungszone, in the vicinity of this area leads the change of direction takes place. The direction and the yarn immediately afterwards from the vicinity of the change can also take place in free space without a guiding surface on a certain second free path, the organs or rollers, which in the relevant section cuts the first free path at an acute angle. Technique known as "rooster tail", pulls off at such a speed that it becomes. But the higher the speed of the yarn, an uncontrolled rebound of the yarn from the greater must be the free length of yarn between the surface and an accumulation of the yarn on the outlet of the heating chamber and the point at which the surface is avoided and the yarn only a single change of direction takes place in order to keep the yarn tension so sharp a change in direction in the vicinity of the surface that a high crimp capacity is experienced.

results. When the yarn hits an upper yarn of the type described through a passageway, its momentum is dispersed so that it guide the υ η stretched yarn from the package 45 under an acting behind the point of impact through a stretching zone and immediately afterwards under tension which is so low that there is no tension whatsoever low tension by a heat shrink zone on a point in front of the point of impact been. With such a procedure, we will immediately follow a new direction of conveyance the yarn speed, expressed as circumferential can. When the yarn is on a surface in one too speed of the forging rolls, in the order of magnitude so far from the vertical deviating angle less than 914 m / min. Now it hits, it doesn’t rebound on the surface in one technically desirable, the spinning process with the control angle to be kept from, and another, Combining stretching and heat shrinkage, the tension-increasing change in direction is possible the yarn in the meantime requested to the yarn body so that the yarn can be unwound in its course. In such a combination process 55 can follow the pulling direction.

are the yarn speeds in the size- The accuracy with regard to the vertical direction-

order from 2740 to 3660 m / min. At this higher power, which is required in this procedure, increases

Speed is lower in the critical zone with increasing yarn speed. In the subsequent

Tension, a large free length of yarn is required, the examples shown here where the yarns are

usually 63.5 cm or more, has a 60 lising surface that is as accurate as possible,

to achieve high K V values. Such large free yarn - ie within ± 5 ⁰ C, is directed vertically. if

However, lengths lead to one thing: r such a considerable immeasur- the yarn speed decreases, it decreases

constant of the yarn run so that neighboring threads also meet the requirements for the accuracy of the lowering

tangle easily and frequent yarn breaks in the right direction of impact.

comes. When the free thread length has been reduced so far 65 By adjusting the take-off speed of the

is that the inconsistency of the threadline not yarn from the stabilizing surface such that

occurs more, the tension required to continuously move the yarn in a single sharp direction

To learn about the yarn in a guiding body or on a change in direction, one avoids the occurrence

5 6

an uncontrollable rebound from the impact turbulence in the further course of the thread, especially on ■ p _a

Job. This not only stabilizes the thread path - the second thread path 30 between the thread path \ _sc (

siert, but also the thread tension very low stabilizer 110 and the brake pins 114, avoided; j, e

held so that it becomes high in curling ability. The brake pins 114 are interposed; r £ _r

achieved. 5 to a zone very low voltage on the first _at

In a method preferred according to the invention and the second yarn path 20 or 30 in front of and behind, each

the exhaust gas flowing out of the heating chamber is brought to the pipe 1.10 by the rollers 112 _;

deflected away from the strand of thread by isolating the th higher tension. The speed yyy,

Exhaust gas flow passes over a Coanda surface, the speed of the rollers 112 is adjusted so that the on } _ru

at the outlet of the heating chamber in the immediate vicinity of the io the tube UjO hitting yarns 13 neither on ^ ₁

Strand of thread is located and accumulates behind the outlet of the surface of the tube still in uncon- ^ ₀

curvilinear away from it. Further, in order to bounce it trollierbarer way, but only one _w,

to convey the yarn out of the zone lower fold a sharp change of direction at the transition q

Tension serving rollers experience one for the yarn stabilization from the first: n path 20 to the second path 30. _sl

did to achieve sufficient tension without the 15 F i g. 2 to 5 show yarns 13, which in a through the jj

To increase tension in the zone of low tension, the arrows in the plane shown are running perpendicular to j

commonly known braking devices will strike a surface and at an angle θ to q

between the zone of low tension and the conveying direction of its feed (ie between the first and _Zl

rollers interposed. the second conveying path). The upper

The process works exceptionally well when ao area must be long enough to convey all forward [ ₍

the yarn consists of threads that intercept at least two th yarns (Fig. 3); but there is nothing else- g

eccentrically arranged, in the longitudinal direction endless lei limitation in terms of their length. The win _z

thermoplastic polymer components from unterkel Θ is not critical. Usually it is a pointed _v

have different heat shrinkage capacities. Angle. If you use a flat stick (Fig. 4) or (

To further explain the invention, a concave surface (FIG. 5) is used on FIG

Reference is made to the drawings. Angle Θ should preferably be so small that a loading \

F i g. 1 is a schematic representation of the inventions agitation of the yarns 13 with the edges of _a Vorrich-

preferred method according to the invention; tion is avoided. _s

F i g. Fig. 2 is an end view of one form of thread die immediately after the heat shrink zone _£

running stabilizer and shows the change in direction of the 30 prevailing yarn tension is here simply as

Yarn on its surface; Labeled "low". It's preferably so low

F i g. 3 is a view taken on line 3-3 of how it can be done without disconnecting the feeder clutch

Fig. 2; speed increases the take-off speed by more than that

F i g. 4 and 5 show, similar to FIG. 2, exceeds other available yarn shrinkage. The chip,

Forms of the thread that can be used according to the invention is so low that it can be compared with conventional,

running stabilizer. Do not determine yarn tension measuring devices

In Fig. 1 leaves the spinneret. Furthermore, the voltage is so low that you can't get any

29 outgoing sheath core threads to individual cooking jig can be switched on without the applicable

nen 13 merged, whereby they in a conventional tensions completely out of equilibrium to

borrowed cooling chamber 12 are quenched with air. 40 bring. In the following exemplary embodiments

The yarns 13 run separately around the feed rollers of each thread of the yarn at the low tension

16, through a stretching zone and in several Umschlin- form of a stretched spiral spring. From this

wrung around the forging rollers 14. In the stretching zone observation and knowledge of the tensions that

(ie between the rollers 14 and 16) is where textiles have to be overcome so that

Stretching point of the yarns in the nozzle device 45, the threads then tightly spiral

15. The pair of rollers 17 pulls the drawn yarns 13 can be, it can be concluded that the low tension

away from the forging roll 14 to allow the rewinding to be between 0.005 and 0.5 g and preferably

to prevent the same and each yarn 13 of an evidence be 0.05 g or less. With the yarn

action chamber 18, in which one of the following examples is the one used

the yarn tension is low. The yarns 13 run 5 ° tension probably about 0.001 g / den,

through the chamber 18 on a first path 20 to the die surfaces, which act as thread run stabilizers;

Stabilizing surface 110, which can be used in the form of a, are usually solid

Tube is shown, its longitudinal axis in the plane surfaces, mostly made of metal. Glass, paper, wood,

of the first path 20 of the advancing yarns 13 lies. Plastics and other solid surfaces are flat

The yarns impinge on surface 110 and 55 if effective. The same applies to the surface of the liquid

are of the take-off rollers 112 in a single surface (z. B. mercury or water). There were

sharp change in direction on a second path 30 only yarn path stabilizers of simple transverse

pulled past the brake pins 114. Then shown in section; one can with equal success

the yarns run through the yarn guide 116 to one of the stabilizers with more complicated ones

conventional twine winder III. Make use of 60 cross-sectional forms.

In the chamber 18, the yarn is passed through a rectified, rapid air flow ren described in such a way that a yarn is conveyed on to the top and warmth relaxed. Hit the outlet surface of a thread run stabilizer It's everyone Chamber 18 joins a Coanda surface yet to assume that an actual physical one 19, which does not always take place down from the first yarn path after 65 hits. Photographic is curved on the outside. In this way, the quick investigations of the point of impact will have shown Flowing exhaust air from those on the first way forward - that under certain circumstances the necessary dismantling Yarns 13 deflected, whereby an air scattering of the moment in the to the surface of the

Yarn stabilizer adjacent thin air shrinks and when exiting the zone the length L _t

shift takes place. This is very difficult to have, the yarn shrinkage (S) will be confirmed according to the following. In any case, for the purposes of equation (1) one can calculate:

Invention of the thin layer of air at rest

on the surface of the yarn run stabilizer as a 5 _ / 100 \

consider the expansion of this surface. M / i) - 1 ~ £ ~~ Ί * ^ ^L > ~ ^L u ">

In the following examples, the gas in the *

Heating chamber air is used, which has the Kräuselvermögen (KV) and the Kräuselrührung with the yarn supersonic velocity at their first loading. Shrinkage (KS) are defined in Example I. Air is preferred when it hits the yarn

has no harmful effect; because it is price - example 1

value. But you can also use the known permanent

Use gases or steam, and under um- flakes of polyhexamethylene adipic acid airiide (Ny-

inert gases (such as nitrogen! or carbon 6-6) with a relative viscosity (RV) of 49% are preferred. It was observed that 15 denier was produced in the usual manner. Further, by treating the yarn with air of less conventional speed than the speed of sound, one also produces a non-isomorphic copolyamide which achieves satisfactory results at 50% by weight from hexamethylene. adipic acid amide units (nylon 6-6) and 50 units

The method according to the invention achieves the weight percent from hexamethylene sebacic acid - not required Yarn stability in zones before very low ao candioic acid - dodecanedioic acid units (nylon 6-10 / Tension in that there is a considerable shortening (6-11 / 6-12). The 6-6 / 6-10 / 6-11 / the free yarn length is permitted. This enables 6-12 copolyamide flakes to have a relative viscosity as already stated., working with extremely high of 55. The Ge yarn speeds used for the copolymerization. mix of sebacic acid, undecanedioic acid and dodecan

37 percent by weight of the 15 diacid described in the examples below consists of dode heat shrinkage processes is also on the training candioic acid and 63 percent by weight from technical other types of crimps or on the heat- sebacic acid, which is about 1 percent by weight undecandi shrinkage Applicable to yarns which are straight acid and about 2 percent by weight dodecanedioic acid are and remain. contains.

According to the invention, spun monofilaments 30 The two types of flakes (6-6 and 6-6 / 6-10 / 6-11 / and multi-thread yarns are processed. The process 6-12) are processed into yarns that go from sheaths is to insist on treating a single yarn core threads, each two of which are eccentric applicable, but brings the greatest advantage when arranged, longitudinally endless thermoplasties is used to have several parallel polyamide components. The process running into each other Treat yarn. Through the 3; ren, after which these sheath core threads were obtained The stability of the thread running is described in US Pat. No. 3,244,785. This here bartcr Yarns and the entangling they cause. when the spinneret unit is used, it is shown in FIG. 2 of the Breaking and / or occurrence of irregularities mentioned patent specification shown, and the jacket the longitudinal direction of the yarns avoided. The core cross-section of each thread is shown in FIG. 5 des

In the examples, the following definitions 40 of the cited patent are presented. The polyamide forms 6-6 and test methods applied: the sheath, and the polyamide 6-6 / 6-10 / 6-11 / 6-12

The term "yarn" means a practically end-forming core. Each thread consists of 48 weightless ones Thread structures for textile use. ! The yarn can consist of a percentage of the sheath and 52 percent by weight spun from short fibers or from a single or core. At its thinnest point, the thickness is the composed of several continuous threads and twisted 45 sheath about 2% of the thickness of the thread. The yarns or be untwisted. are according to the in F i g. 1 shown procedure

A "drawn yarn" is one that is spun, treated and spun into a package by considerable length; " a molecule power.

larorientation in the axial direction of each in the stretching zone between rolls 14 and 16

Fadens has learned. 5 ° the yarns 13 are drawn 3.6 times, and

The "relative viscosity" is the ratio of the training of the draw point is located in the Düsenvorrichflußzeit a polymer solution to that of the tung 15 in which a 25O ⁰ C hot air jet to the pure solvent, measured at 25 ⁰ C, directed from a running yarn is . This extension viscometer in the examples, the method, and the nozzle device 15 are described in terms of the invention in its application to the her- 55 game XI of US Pat. No. 3,452,130. Explain another position of polyamide sheath core surfaces. Pair of rollers 17 pulls the drawn yarns 13 from serving as a solvent a solution of 90 weight- the stretching rollers 14 to divide the rewinding of formic acid and 10 parts by weight of water, prevent and each yarn 13 of the treatment and the polyamide solution is prepared by feeding chamber 18 where a very low yarn - 5.5 g of polyamide in 50 ml of this solvent at 60 tension prevails. In the chamber 18, the yarn 25 ⁰ C is released by a rectilinear surrounding each yarn 13

"Schrumpfune" or "Wärnwschnimpfung" ended importance, heat-relaxed rapid air stream, the tet the decrease in length of a drawn yarn in-air temperature is adjusted such that the temperature due to heating ^{at the outlet of the} chamber is 18 175 ⁰ C. In this

The "yarn shrinkage" is the percentage of length and in the other examples the hot air is drawn into the decrease in a = straight yarn per unit of its chamber 18 at a point of narrowed diameter. When a unit of mass of the yarn is blown in at the knife, so that the air velocity enters a zone of length L ₁ , in the zone during part of the passage through the chamber

609538/351

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18 exceeds the speed of sound. The chamber 18 is described in US Pat. No. 3,261,071.

The yarn running stabilizer 110 (see FIGS. 2 and 3) is an approximately 5 cm wide metal tube, which is arranged with its longitudinal axis in the plane of the advancing yarns 13 and perpendicular to their running direction. The distance between the outlet of the chamber 18 and the upper edge of the tube 110 (ie the free length of the yarn) is 25 cm. The take-off rollers 112 draw the yarn 13 from the tube 110 . The speed of the rollers 112 is adjusted so that the yarns 13 do not collect on the surface of the tube 110 when they hit the tube 110, but simply experience a sharp change in direction on the surface of the yarn run stabilizer 110. The angle between these two yarn paths is not critical; however, in this case it is 60 ". Each yarn 13 runs through a yarn guide 116 to a conventional package winding device 118, from which the yarn is wound at a speed of 2377 m / min. The peripheral speed of the roller 112 is 18% lower than that of the rollers 17, ie the yarn relaxation in the zone of low tension is 18% In the zone of low tension, the yarns 13 remain completely stable, although at a distance of only 25 cm from the chamber 18 they experience a sharp change in direction.

Each crimpable 7-ply yarn 13 has a total denier of 45 denier in the package. By winding 16 turns, the yarn 13 is made into a strand with a total denier of about 1500 denier, which is 55 cm long when it is hung up under a load of 500 g. When the strand has hung for 1 minute, the strand length L _{1 is} determined. Then the 500 g weight is replaced with a 1.8 g weight (about 0.0012 g / denier). ^{The strand is treated with steam at 121 °} C. for 1 minute in a conventional drying oven and then air-dried for 30 to 60 minutes. The strand length L _{2 is then determined} with the 1.8 g weight still hanging on the strand. The strand length L ₃ is determined immediately after the 1.8 g weight has been replaced by the 500 g weight. The curling power (KV) is calculated from equation (2):

Example 2

L ₂

L ₂

100

(2)

The crimp shrinkage (KS) is calculated from equation (3):

KS (%) = - - -100

(3)

The yarn of this example is characterized by a crimp power of 24.1 % and a crimp shrinkage of 6.8 %.

In the same way, but with a relaxation (by increasing the withdrawal speed) reduced to 16% in the zone of low tension produced yarn has a much lower crimp capacity (12.6%) and a higher crimp shrinkage (7.9%) Use the lowest possible yarn tension in the low tension zone.

One operates as in Example 1, but increasing the air temperature in the chamber 18 by about 2O ⁰ C and increasing the yarn relaxation prior to 18% to 22%. The crimping power was 33.9%, and the crimping shrinkage decreased to 4.9 ° / _c . The thread running stability is sufficient for a continuous

ίο borrowed, trouble-free work process. It is believed, however, that the value of 22% is very close to the maximum relaxation which can be applied under these conditions without the yarn being fed into the tube 110 faster than it is drawn off by the downstream rollers 112 . Such a condition would lead to an uncontrollable instability of the thread path.

Example 3

You work according to Example !, but with Rohrer 110, which have the following diameters: 1.27 cm, 1.91 cm, 2.54 cm, 3.18 cm.

All of these tubes turn out to be the 5.0 cir wide pipe equivalent. The pipe with the smallest diameter can be removed due to the small deviation It is difficult to get individual yarns into the correct position from the plane where they hit the pipe bring. A pipe diameter of 1.27 cm is the practical lower limit in this regard.

Example 4

The procedure is as in Example 5, except that: tube 110 is replaced by thread run stabilizers (metal rods with a flat surface which have the following widths Jf: 1.27 cm, 2.54 cm, 5.08 cm, 7.62 cm, 12, 70 cm, 30.48 cm.

In all cases the same effect is obtained wi <in example 1. In this case, however, the vertical! The position of the flat surfaces in relation to the conveying direction of the yarns is somewhat less critical than in the case of ge curved surfaces, which is why flat Cvrflachpr to be favoured. Towards the top, the width of the flat thread run stabilizer is unlimited; for di ( However, in most systems a rod is preferred which is narrow enough to easily fit into the available space standing room fits into it. The minimum width is the one where all yarns are still on the Thread run stabilizer can hit. You can work with bars that are less than 1.27 cn

are wide; usually, however, there is no advantage to be gained from further downsizing.

Example 5 One works according to example 1, but replaces there:

Tube 110 through a circular concave top

surface (Fig. 5) with a radius of curvature voi

15.2 cm and a width of 30.4 cm, measured lengthways!

the curved surface. If this surface in relation to the level of the forward sponsored Garni

is centered and oriented so that the yarns sink

hitting them right, you get practically the same thing

Similar results as in Example 1.

Example 6

All of the preceding examples describe preferred methods, including a Coanda superficial 1! in the form of a curved to a cylindrical section with a radius of curvature of 10.2 cm

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len. 6.4 cm wide plate in the conventional way attached to the outlet surface of chamber 18. The plate is adjacent to that emerging from chamber 18 Row of spaced apart yarns 13 and attached parallel to the same. In In this example the general procedure of the previous examples is repeated, with four trials the effect is explained which is obtained when one uses the Coanda surface with or without application a fader run stabilizer 110 omits. The results can be found in the table below. The yarn take-off speed is the same in all cases and is about 18% lower than that constant circumferential speed of the rollers 17. These experiments are not aimed at a possible high curling power worked towards it. A 2.5 cm wide rod with a flat thread serves as a thread run stabilizer Surface.

Results of Example 6

attempt 2 3 4th 1 Yes J ^a no Coanda no no Yes Yes Stabilizing bar no 20.8 22.9 22.3 KV, " _n 25.9 5.4 5.0 4.9 KS, '.' ₀ 4.8 Feasibility unusable perfect

In experiment no. 1, which is carried out without a Coanda surface and without a stabilizing surface, the free thread length is 63.5 to 78.7 cm. The threads run very inconsistently and touch each other 5 often and break often. This process is too volatile for practical purposes.

Trial No. 2 differs from Trial No. 1 only in that it uses a Coanda surface will. The thread running stability is improved because the

ίο required free thread length is 30.5 to 58.4 cm reduced. The remaining instability and the resulting frequency of yarn breaks is however still acceptable.

Trial No. 3, which corresponds to a preferred method according to the invention, makes both of a Coanda surface as well as a stabilizing surface. The stabilizing rod is 20.3 cm below the outlet of the chamber 18. The threads run in this case completely stable, without to interfere with each other and without occurrence of yarn breaks.

Experiment no. 4 is a repetition of experiment no. 3, but with the Coanda surface left in place is. The thread running stability increases as a result

as something from; however, that is continuous feasibility absolutely flawless. From this it follows that the decisive factor for improving the stability of the thread path Factor is the use of a stabilizing surface. The additional use A Coanda surface is preferred, but not absolutely necessary.

1 sheet of drawings

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Claims (4)

in this patent specification, the unpatent claims are: drawn composite yarns drawn in order to have a different heat shrinkage in the components 1. To develop methods of heat shrinking final assets. The drawn yarns are ! os yarn yarns under low tension, with the 5 then increasing under very low yarn tension to bring about the different shrinkage of the yarn in a heat treatment zone, introduces a stream of hot gas that heats the yarn and the resulting forces lead to a and shrink it, doing it on a spiral curl. At this point of death Free path to a surface promotes when driving can be the spiral rippling of the one The first free path is created, and the yarn has to be un- io individual threads but the yarn needs to be visible indirectly introduces a second free way of not being visible. The heat treated yarn which has a different direction than the first free one is then put under tension at least as much, Path, characterized in that it is smoothed, and becomes m smoothed, not sp.ralman the yarn along the first free path with a crimped shape to the yarn body at speed feeds at more than 914 m / min, 15 wound. After processing into textile essentially forms (e.g., after knitting) the yarn from the package on the first free path borrowed perpendicular to a smooth, fixed itself in the heat treatment of the untensioned Area that resists the spiral crimping of the fabric at a distance of 3 to 4 inches located behind the heat treatment zone, into the threads and gives the textile its elasticity this area leads and the yarn immediately so availability. Then from the vicinity of the area on a certain- From US-PS 31 69 296 and 32 51 181 it is pray second free path, knowing the first free path, thermoplastic continuous filament yarn through hinin cuts at an acute angle, with a sol- ve passing through a vortex nozzle in which the yarn subtracts the speed that an uncontrolled gas is treated with a plasticizing hot gas, lated bouncing of the yarn off the surface and 25 and bouncing of the coming out of the nozzle an accumulation of the yarn on the surface means that the yarn immediately behind the nozzle means one is avoided and the yarn is only crimped by a single sharp rotating sieve drum. This will be Changes direction in the vicinity of the surface experiences. yarn deposited on the rotating drum of 2. The method according to claim 1, characterized in that the drum is continued and drawn from the gas stream, that part of the gas stream is cooled to 30, the crimping being fixed. For the a place in front of the smooth, fixed surface solution of the problem, from a heat treatment of distracts you the first way. Chamber incoming threads under low tension 3. The method of claim 1 or 2 applied at high speed to such the package to supply one of two components different so that the thread run is stable and adjacent shrinkage capacity existing bicomponent threads are on their free path to the winding thread, can not mess with each other, could not 4. The method according to claim 1 to 3, thereby no suggestion gained in these patents characterized by the fact that the yarns are essentially on because one is immediately behind the warmth parallel paths in the direction of the smooth, treatment chamber arranged rotary drum promotes fixed surface. 40 which bounce the threads with high momentum, which in the the present case would thwart the intended effect.
A similar procedure (US-PS 31 43 784) makes from one immediately below the gas treatment nozzle 45 arranged horizontal rotating wire mesh disc use to separate the yarn from the gas flow to separate and fix the crimp. The yarn is deposited on this disc, on a half The invention relates to a method for heat rotation being entrained and then for winding-up shrinking deducted from continuous filament yarns below 50 digit. However, if this disc is used with a Tension in which the yarn is subjected to a heat treatment zone that corresponds to the spinning speed introduced into a stream of hot gas that would circulate if it were to come out of the nozzle the yarn is heated and shrunk, and the yarn that comes in the process is not deposited on it promotes on a first free path to a surface, thrown away by the centrifugal force at which the first free path ends and the yarn becomes un- 55. indirectly introduces a second free path, the FR-PS 11 00 529 describes a method for has a different direction than the first free path. Crimping a continuous thread in which the thread at Recently, yarns for stretch textiles, 25 to 35 ° C in a nozzle with a gas jet, have been particularly popular for sheer women's stockings, is declined and then preferably on a direct wrap in which each thread from at least 60 bar arranged behind the nozzle is fixed, inclined two eccentrically arranged, in the longitudinal direction terminated, flat impact surface or on a directly loose thermoplastic polymer components behind the nozzle are fixed spheres, which hits a different shaped impact organ during the heat treatment. At this impact shrink to a considerable extent. The components form a crimp in the thread. A can be placed side by side or in an eccentric 65 similar process in which one is used to run the thread Sheath-core assembly be connected to one another. inclined flat impact surface «is used and The US-PS 33 99 108 describes the production of the emerging from the gas nozzle thread when Aufsolcher spiral crimped stretch yarns. We hit the one just 6 mm from the nozzle