DE2462364A1 - METHOD OF MANUFACTURING DRAFT TEXTURED DENSE YARN - Google Patents

Description

Dr. F. Zumstein Sr. - Dr. E. Assmanr. - Dr. R. Koenigsberger Dipl.-Phys. R. Holzbauer - Dipl.-Ing. F. Klingseisen - Dr. F. Zumstein jun.

8 MUNICH Z,

BRÄUHAUSSTRASSE 4

TEU = FON: COLLECTIVE NO. 22 5341 TELEGRAMS: ZUMPAT TELEX 529979

3 / Li

0 23 460/460 B.
0 PF-45

Phillips Petroleum Company, Bartlesville, OkI., USA

Method and apparatus for treating yarn

The invention relates to a method and an apparatus for treating synthetic filament yarn.

Often it is desirable to make a yarn that has greater bulk and sheath, as well as an improved one Has a good grip and that comfortably through a textile manufacturing process, can be processed, for example, by ¥ leveling, knotting, knitting, etc. It is also desirable make the yarn packages as dense as possible in order to reduce the number of package changes during the Y / icklungsvorganges and during the further processing of the Limit yarn. Often yarn should also be used that is textured and then for easier handling ■ is straight, but in which the texturing is back

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reverses when it is subsequently treated with heat.

When crimping yarn using processes that result in the formation of a wad of crimped yarn, it is required to control the length of the plug. This was done in various ways, for example with the help of weight or pressure controlled exit slots, a controlled peel speed, etc. achieved.

It is the object of the invention, a method and an apparatus for making straight-pinned, textured yarn to deliver. The yarn lap should be made as tight as possible. Furthermore, it should be straightened, textured Yarn can be produced that can be conveniently handled in a textile manufacturing process and its texturing resumes on rewarming. The length of the wad of crimped yarn is to be controlled.

In the method according to the invention for producing synthetic, Textured filament yarn is drawn, synthetic filament yarn, crimped and entangled, and then stretched straight by treating the textured yarn with heat and tensioning it. The device according to the invention to carry out this method has a crimping device, a device for entangling the yarn and means for straightening the yarn arranged in that order. According to the invention will continue the length of the yarn plug generated during the crimping of the yarn is controlled by the temperature of the Yarn is adjusted before or during the crimping process. A method and apparatus are also provided supplied, the length of the formed by the curling device Controlling Garnpforpfens that the position of the Garnpropfens monitored and the temperature of the yarn is controlled as a function of it.

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In the following, for example, preferred embodiments of the invention are explained in more detail with reference to the accompanying drawings explains: χ

Fig. 1 shows the schematic work plan of an example for carrying out the method according to the invention, in which previously stretched yarn is processed »

Fig. 2 shows the work plan of an example for carrying out the method according to the invention, which differs from that in Fig. 1 differs in the example shown in that undrawn or partially .stretched yarn processed will.

In FIG. 1, drawn, synthetic continuous filament yarn 2 is guided from a number of laps 1 through guide eyes 6 and tensioned with the aid of tensioning gates 7 in order to control the yarn coming from the winding. The yarn becomes education of the yarn 4 with the desired total denier are brought together in a guide 9 and tensioned with the aid of a tensioning gate 8, to ensure better control of the yarn. The yarn 4 is directed to a heated conveyor roller 10. That Yarn is then fed to a suitable crimping device. In the embodiment shown in FIG the curling device 16 consists of a fluid jet area and a chamber containing a number of stacked elements such as balls 15 (FR-PS 2 113 633). For warming of the yarn and to aid in the crimp, a heated fluid enters the jet area through an inlet 17 a. and through the stacked elements 15 at off. ' An adjustable catch roller 18 is used to the Giving yarn a controllable amount of false twist before crimping. This measure is useful in reducing heat losses of the yarn and thus the yarn volume with which the yarn enters the crimping device 16 to regulate. The plug of yarn 20 formed in the crimper 16

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is passed through a tube 22 in which the yarn plug 20 is broken open and with the help of countercurrent air 23 or another suitable fluid is cooled.

The length of the yarn plug 25 in the crimper 16 is inversely proportional to the temperature of the yarn in the Curling device. A rise in the temperature of the yarn in the crimping device causes the yarn to shrink, so that the titer of the yarn increases and thus the length of the yarn plug decreases. A drop in the temperature of the yarn therefore increases the length of the plug of yarn. A temperature control 31 controls the temperature of the feed roller 10, which in turn controls the temperature of the one entering the crimping device Controls the yarn and thus the length of the yarn plug. The temperature controller 31 is set so that the temperature of the roller is maintained, which is set at a preselected temperature or a set point. The temperature control is of a conventional type that relies on the resistors of temperature sensitive devices, for example a thermistor, responds. In addition, a bypass circuit is included in the temperature control, which increases the temperature of the roller so that this temperature is controlled to a value above the set point when the bypass circuit is activated when the resistance of a resistance bead (thermistor) increases with increasing temperature increases, the bypass circuit only reduces the actual resistance as determined by the temperature control is seen, which has the consequence that the temperature control heats the V / alze to a temperature above the set point. The coil is supplied with heat until the resistance of the resistance bead has been modified by the bridging circuit (Thermistor) is equal to the resistance of the resistance bead (thermistor) at the nominal point. A photocell 27 is detected the length of the yarn plug 25 and activates the bypass circuit of the temperature control 31> when the yarn

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plug interrupts the light beam of the photo element 27a. This has the consequence that the temperature controller 31 increases the temperature of the roller so that it is at a value above the Setpoint value is controlled, whereby the temperature of the yarn increases and the length of the yarn plug is reduced. if the plug of yarn 25 falls under the beam 27a of the photocell, the bridging circuit is put out of operation and the Temperature control 31 keeps the temperature of the roll at the target value.

The temperature control 31 should be set to a target value at which the controlled temperature of the Roller has such a value that the length of the plug of yarn is held just above the beam 27a of the photocell, i.e. the plug is just interrupting the beam. When the beam 27a of the photocell is interrupted by the yarn plug 25, the bypass circuit is activated activated, whereupon the temperature controller 31 increases the temperature of the roller to a regulated value above the setpoint value controls. This in turn increases the temperature of the yarn and thus reduces the height 25 of the yarn plug until the photocell 27 is hit again by the light beam 27a, from which it follows that the yarn plug is below the Light beam is located. The temperature control. 31 therefore tries to put the end of the yarn plug just above the beam to keep the photocell, and the photocell 27 tries to reach the end of the yarn plug directly below the beam of the To keep photocell. From this competition there arises a balance that leads to an excellent regulation of length of the yarn plug and the amount of crimp.

In practice, the bridging circuit causes the temperature controller 31 to keep the temperature of the roller at a regulated level Value above the target value increased by an amount sufficient to ensure that the yarn plug

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falls under the beam 27a of the photocell. The control according to the invention can be used in general for synthetic filament yarns and is particularly useful when treating thermoplastic yarns, including polyamide, polyester and polyolefin yarns. When treating nylon, excellent results can be obtained if the bridging circuit increases the temperature of the roller to a controlled value, about 8 ^° C. above the setpoint value. However, when the bypass circuit is activated, the. The controlled temperature of the roller can only reach a value that is a few degrees above the target value before the plug of yarn falls under the beam of the photocell.

The temperature controller 31 is generally a quiescent temperature shift controller known of the proportionality type with a bypass circuit that switches on and off. It can, however other controls, for example those that operate on a voltage instead of a resistance value, can also be used speak to. The control can have a proportionality type or an on and off type for both the setpoint and the also be for bridging operation.

According to Fig. 1, the crimped yarn 4 is guided by tension guides 28 stretched and passed through a device for intertwining the yarn. The crimped and entangled yarn 4 becomes guided via a guide 34 onto a peeling roller 36. The ruffled and entangled yarn 4 is a relatively high tension with the aid of a constant tension winch 40 according to de'm Passing the guide 42 suspended. While the yarn is exposed to the relatively high tension, it is pulled through a suitable heater 33 heated with a heating fluid that enters the chamber at 39a and exits the chamber at 39b.

The tension of the yarn in the area 32 in which the yarn is entangled is, must - compared to the tension of the yarn

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in the heat treatment area 37 ". be relatively low. The reason for this is that a high voltage in the area 32 would prevent the yarn from being entangled. On the other hand, there would be a low tension in the region 37 »in which the yarn is being stretched, hinder the stretching process, so that these two areas by suitable means, for example by the peel roller 36, must be isolated from each other.

FIG. 2 explains an example of the method shown in FIG. 1, in which, however, the undrawn or partially drawn one Yarn is used. The main difference is that in this implementation example a heated draw roll 12 is used. The temperature controller 31 and the bypass circuit, which is by the Photocell 27 is activated, control the temperature of the drawing roller 12 and not the temperature of the conveyor roller 10, as is the case with the example shown in FIG. Although in this process a process stage is a stretching stage is, it is also possible to control the temperature of the conveyor roller 10 instead of the temperature of the draw roller 12. The stretching ratio should have the greatest value that is compatible with a faultless stretching process. Except for these In contrast, the method shown in FIG. 2 is identical to the method shown in FIG. 1.

If the length of the plug of yarn is controlled by controlling the speed of the peel roll, it may result a problem arising from the change in the denier of the yarn. If, according to the invention, the temperature of the in the curl range entering yarn is adjusted to control the length of the yarn plug 25, the peel roller 36 can be on a constant speed. Such a control of the length of the yarn plug leads to the surprising result, that a yarn is produced with a linear density in a wide range

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is narrower than is the case when the length of the plug of yarn is controlled by the speed the peel roller is changed. Other variable quantities can also be used upstream to control the yarn temperature than the temperature of the conveyor or drafting roller, for example the temperature or the flow rate of the im Fluid jet related fluids, can be adjusted.

In practice, timing elements or time delay relays are included in the circuit of the photocell, so that the bridging circuit the temperature control 31 is not activated or, if activated, not switched off before a previous one specified time has elapsed. This achieves damping for the control circuit and constant switching and to and fro avoiding.

Instead of the photocell, other sensors can also be used for the yarn plug, for example mechanical sensors or combinations of electrical and mechanical sensors are used, which are well known.

If necessary, two temperature controls can be used instead of one temperature control. A temperature control would then function in a similar manner to temperature controller 31 except that the photocell does not Would activate the bypass circuit. 3 in one of these The system would switch the photocell from one temperature control to the other, with the second temperature control being one has a higher setpoint value than the temperature controller 31.

In a specific example, the tube 22 has an inside diameter of about 2.5 cm (1 inch) and is made of a material with smooth walls so that the pressure applied to the yarn Resistance is as low as possible. A lining made of polytetrafluoroethylene or another suitable material

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material can be used to improve this property. The section 22a of the tube is 32 cm in length (12.5 ") and section 22b is 1.2 m (47.5") in length. The tube 22 has a 90 ° bend 22a with a. radius 19 cm (7.5 ") while allowing the tube 22 to run straight. Four openings 21 approximately 0.95 cm wide (3/8 ") and a length of 15 cm (6") are located upstream of the curve, but can be either upstream or be provided downstream of this bend. Air enters tube 22 at point 23, flowing in countercurrent to the direction of movement of the yarn 26 through the tube 22 and emerges from the tube at the openings 21 and 24 again. the Air is at ambient temperature and the actual flow rates are as shown below Examples listed.

The tension of the yarn in the device for intertwining of the yarn should be chosen so that the yarn can be easily entangled. The tension of the yarn in area 26 may be slightly under the tension of the yarn in area 32 where the yarn is entangled.

Before the yarn is wound up in area 37, the yarn is treated with heat and steam and placed under tension. These parameters can be changed to control the amount of straight stretching of the yarn. Water vapor acts on different yarns different. For example, nylon is generally more affected by water vapor than polyester or polypropylene. It has therefore been shown that the via steam is more significant when the yarn is stretched straight Parameter when treating nylon than when treating polyester or polypropylene. A convenient method, kylon yarn heating and moistening consists of heating the yarn in a chamber with saturated steam. It can, however also other facilities both for heating and for

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Moistening the yarn can be used.

The tension of the yarn in region 37 should be sufficient to straighten the yarn, but not so high that the yarn is drawn. This tension is generally higher than the tension of the yarn during entanglement. In treating nylon yarns, excellent results have been obtained when the tension is in the range of 0.04 to 0.12 g / denier was used in the area where the yarn was straightened, drawn.

The temperature of the yarn should be set during dous straightening be high enough to make straightening easy. It should be noted that all of these parameters, i.e. the V / aine, the Moisture and the tension, the straightening of the yarn influence, and each parameter should be chosen in relation to the other parameters.

By using the method according to the invention, the yarn can be treated completely in one continuous working process without the yarn being able to cool down to ambient temperature once the working process has started. Most yarns tend to worsen with each V. ^r iedererwärmung to some extent. ¥ erm the yarn can be treated in a continuous operation, as is the case when using the method according to the invention, the yarn is not completely cooled and then reheated, so that the yarn is subjected to a lesser extent to conditions that lead to deterioration lead and thus has a higher quality.

The product of the process according to the invention is a wound one Yarn, the lap itself being of high density, the yarn straight and for knotting or other textile manufacturing processes is easy to use, and the construction

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The elasticity of the yarn returns when the heat is applied. It is important that the yarn be wound while it is still warm and under the desired tension. Through this the yarn stability with respect to the straightened state is increased once the tension is released.

While the method described above is generally applicable to synthetic Filament yarn is applicable which is crimped, intertwined, straightened and then by application of heat Can be made puffy, it is especially when treating of thermoplastic yarns, including yarns made of polyester and polyolefin, and in particular of polyamides, usable. Excellent results have been obtained using the method described above on synthetic filament yarns obtained from polycaprolactam (nylon 6) and poly (hexamethylene) adipamide (nylon 66) as in the following examples is shown, in which the illustrated in Fig. 2 implementation example of the method according to the invention with the The exception was that no photocell was used and the length of the plug was manually controlled by it, that the speed of the peel roll and / or the temperature of the draw roll have been adjusted.

example 1

A feed yarn consisting of two threads was used Made of 4700 denier 70 filament polycaprolactam (nylon 6) with trifoliate Cross-section existed. The heating chamber 38 consisted of a 3/16 "diameter and length of tubing 60 cm (2 ft) which had three 0.5 cm (3/16 ") diameter inlets for the heating fluid spaced from each other were arranged along the pipe. Saturated water vapor at 2.6 aim (24 psig) was used as the heating medium. That textured product v / i has a titer of 3200 denier. The remaining process conditions are in the table below I listed «

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-o ¹ -

Table I. Tension in g Procedural conditions 14th Slip-on gate,
single thread 50 4.3 (9.5) when reaching the conveyor roller 150 23 (9 1/4) when reaching the texturing
beam 125 when leaving the cooling tube 50 Entanglement area 70 Post treatment and winding 200 Temperatures, ⁰ C ( ⁰ F) Conveyor roller (9 windings) 49 (120) Streckv / alze (7 windings) 170 (338) Jet steam 282 (540) Jet steam Throughput kg / h (lb / hr) 9.5 (21) Pressure, atm (psig) 6.7 (84) Air flow ·, l / min (scfra) pipe 340 (12) Entangling device 538 (19) Stretch ratio 3.75 Speeds, m / min Streckv / alze 1100 Conveyor roller for the winder (9 wraps) 800 Peeling cycle, min. Wrap weight, kg (net lbs) Winding diameter, cm (inch)

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The product of this process was a straightened, textured one Yarn that was wound in a relatively tight package. The yarn showed a very high stability with respect to its straightened shape in the absence of tension and proved to be an excellent carpet yarn with a very good carpet sample quality and good tuft quality.

Example 2

In this example, the procedure illustrated in FIG. 2 was followed used with the exception that a feed yarn was used consisting of two threads of 3900 denier 70 filament polycaprolactam (Nylon 6) with a three-leaved cross-section.

The steam chamber described in Example 1 was used. The process conditions are shown in Table II. the
voltages not listed are the same as listed in Table I for Example 1.

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Table II Sample 2 Sample 3 .. Temperatures 88 (190) 88 <19o) ⁰ C ( ⁰ P) 182 (360) 182 (360) Conveyor roller
(9 windings) Procedural conditions 271 (520) 271 (520) Draw roller
(9 windings) Sample 1 Jet steam 66 (150) 8.5 (18.8) 8.5 (18.8) Jet steam 202 (395) 7.12 (90) 7.12 (90) Throughput, kg / h
(lb / h)
Pressure, atm (psig) 271 (520) Air flow l / min
(scfto) 142 (5) 142 (5) pipe 8.5 (18.8) 623 (22) 538 (19) Devouring
Facility 7.12 (90) 3.75 3.75 Streckverhaitni s Speeds, 142 (5) 1125 1125 in m / min
Draw roller 623 (22) 800 800 Conveyor roller for
the winder
(9 windings) 3.75 So annun seeη, g 1125 800

Entanglement area 60 (if the entangler is switched off),

Post-treatment and winding 200

60

60

200

200

The textured product had a linear density of 2600 denier. The procedure in Example 2 was different from the procedure of Example 1 in that 1) a lower steam jet throughput and a lower temperature, 2) a higher Temperature of the drafting roller in order to reduce the crimp, in particular the crimp frequency, and 3) a lower one

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Tension in the entanglement area as a result of the reduced Flow of cooling air to increase the degree of entanglement, were used.

The quality of the yarn produced was similar to that of the after the yarn produced in Example 1 is comparable.

Example 3

It was again the process shown in Fig. 2 with the The exception is that the feed yarn consists of three threads of undrawn, 2000denier 30 filament non-matted Polyhexamethylene adipamide (nylon 66) yarn with a three-leaf cross-section. The capillary length of the fluid jet was 7.9 cm (3.1 inches). The process conditions are listed in Table III. It became the same fluid chamber as in related to Examples 1 and 2.

Table III Procedural conditions

. Tension on reaching 375

of the conveyor roller in g

Temperatures, ⁰ C ( ⁰ F)

Conveyor roller (9 wraps) 102 (215)

Draw roller (5 wraps) 209 (408)

Fluid jet steam 343 (650)

Fluid jet steam

Throughput, kg / h (lb / h) 11 (25)

Pressure, atm (psig) 5.1 (6o)

Wrap weight, kg (net lbs) 3.2 (7)

Winding diameter, cm (in) 18 (7)

The textured product had a tifcar of 2640 denier. The rest of the bathroom facilities not listed in Table III

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The procedures are the same as listed in Table I for Example 1. The yarn made was with the yarn comparable to the two previous examples.

The method and apparatus described above are particularly good at treating nylon yarn, suitable for making carpets and other similar products, as can be seen from the examples described above. The inventive method and the inventive device can, however, also on polyester or other synthetic filament yarns can be used.

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Claims (2)

Claims 1. Process for producing a stretched, textured, dense yarn in which the drawn or undrawn yarn is crimped, the crimped yarn for partial elimination the crimp is straightened without drawing the yarn and the crimped yarn is entangled, characterized in that the intertwining prior to straightening is independent of tension is carried out and that this entangling takes place at a lower tension of the yarn than when stretching straight. 2. Apparatus for performing the method according to claim 1 with a crimping device, with a device for Introducing the yarn into the crimper with means for entangling that from the crimper coming crimped yarn and means for straightening the crimped yarn, thereby characterized in that the means for straightening the yarn is arranged to remove the tangled Takes up yarn from the means for entangling the yarn and that means for stress isolation is disposed between the means for entangling the yarn and the means for straightening the yarn. 60 9382/092 1