JPS58169531A - False twisting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a false twisting machine for thermoplastic synthetic fibers, in which the temperature of the yarn entering the false twisting tool can be arbitrarily set.
This invention relates to a false twisting machine in which the slope of a first heater can be changed.

Commercially available processing machines currently used for false twisting can be roughly divided into spindle-type low-speed processing machines and friction false-twisting type processing machines that can perform high-speed processing. In all of these processing machines, the distance between the exit end of the iris heater and the inlet of the false twisting tool is limited by the distance between the yarn entering the false twisting tool at the limits of the processing machine's capabilities (especially speed and usable denier limit). A cooling length or cooling plate length is provided so that the temperature can be cooled to below its glass transition temperature. This is because the basic idea of the conventional false twisting process has been to cool the yarn below its glass transition temperature before entering the false twisting tool. And this idea is still alive today, for example, "Filament Processing Technology Manual" Volume 1 (published by Japan Textile Machinery Society), No. 0-93.
Truly detailed.

By the way, in recent years nine-part oriented unsharpened yarn (p
With the advent of simultaneous stretching and false twisting, so-called POY-
DTY (IN-DRAW) is now possible.

Among the 40 types of false twisting machines used in this POY-DTY processing, friction disks are currently the mainstream because of their high-speed false twisting properties. And, unlike conventional spindle-type low-speed processing machines, this processing machine generally has a first
As shown in the figure, the first heater 4 and the false twisting tool 8 are installed facing each other across the work floor, and the space above them is used as a long cooling zone, which is suitable for high-speed processing and workability. Therefore, various studies were conducted on POY-DTY processing using a commercially available high-speed false twisting machine, but the performance of the resulting processed yarn, especially the crimp rate, was not high enough for practical use, and the process stability was insufficient. This was also not necessarily desirable, as many fluffs and yarn breakages occurred.

Therefore, the present inventors solved these problems and
As a result of various studies to maximize the advantages of Y-DTY processing, we found that by increasing the temperature of the yarn entering the false twisting tool to above the glass transition temperature, processed yarn with high crimp development ability was obtained, which made it easier for parent processing. It has been discovered that processing with excellent process stability can be achieved with less fuzz even when the material is hit. In other words, the yarn temperature just before false twisting should be freely controlled, rather than being cooled to below the glass transition temperature, which is the basic concept in the trench. Thus, yarn can be obtained, and the present invention has realized a processing machine that can most easily carry out this process.

Thus, according to the present invention, in a false-twisting machine in which a first heater and a false-twisting tool are opposed to each other with a working floor interposed therebetween, and a cooling zone is provided above the working floor, the first heater is swingable. , a nine false twisting machine which allows the cooling length from the outlet end to the false twisting tool to be set arbitrarily.

is provided.

Here, some background on the invention will be described.

Fabrics made of false-twisted yarns are broadly classified into woven and knitted fabrics, and textured yarns for textiles are usually those that use only the first heater, that is, one-heater textured yarns. The reason for this is that woven fabrics often require a high quality, and in order to increase this quality, it is necessary to increase the crimp performance (crimping rate) of processed yarn O.

However, according to research by the present inventors, in textile applications,
It has become clear that the developed torque of this processed yarn (the torque developed in boiling water) is also an important characteristic, and that it affects the texture as well as the crimp rate. Moreover, it was also revealed that this developed torque is related to the orientation (Δn)K of processed yarn.

In the production of single woven fabrics, the width is tightened during a relaxation step in boiling water, and what controls this width increase rate is the crimp rate of the processed yarn and the developed torque. However, with conventional processing machines, even if the processing conditions are variously changed, conditions for increasing both the crimp ratio and the torque cannot be obtained. According to the conventional thinking, increasing the number of false twists (number of twists) and increasing the temperature of the first heater were effective for increasing the crimp rate. If the temperature is too high, the crimp rate will conversely decrease, and there will be a temperature at which the crimp rate reaches its maximum. On the other hand, as the number of laces increases, the crimp rate increases, but on the other hand, the developed torque of processed yarn seems to decrease. Moreover, it is necessary to adjust the torque within a certain range. This torque is also used for machining special K POY-DTY
At the time of processing, it is possible to increase the gloss to some extent by increasing the draw ratio during processing, but the texture of the fabric targeted by the present invention cannot be achieved with the thread processed by existing processing machines.

The biggest cause of this is the small width-in rate during relaxation during fabric processing, and it is impossible to increase this rate with current processing machines.

・The reason for these low expansion rates has been K.

This is because the heated yarn leaving the first heater at the same time is sufficiently cooled in the cooling section and then enters the false twisting unit, and this idea is based on the theory of conventional false twisting.

The present inventors doubted this theory and increased the temperature of the heated yarn entering the false twisting tool, which increased the crimp rate and torque of the resulting processed yarn, and increased the width of the fabric when it was relaxed. At the same time, he discovered that the finished fabric had good texture and firmness.

Hereinafter, the present invention will be explained with reference to the drawings while comparing it with a conventional processing machine.

Figure 1 is a route map of the friction disc type two-heater false twisting machine currently on the market.
This type is most commonly used in the TY process. In the figure, l is a package of highly oriented undrawn yarn poy (or raw yarn)! Fi indicates the yarn. The yarn 2 is fed by the feed roller 3 to the first heater 4, passes through the guide 5, is cooled by the cooling plate 6, passes through the guide 7, is untwisted by the false twister 8, and is delivered to the delivery machine 9.
The processed yarn 10 is taken up by rollers at a predetermined speed. Next, the processed yarn 10 passes through 11 second heaters.
2 wL2 delivery roller 13 zero 113f! Jbe! It passes through J-Om9-, passes through 14 guide bars, and is wound up as 16 pieces of cheese with a reflex 15. Here, normally, the so-called one-heater processed yarn for textiles does not use the second heater of 11, and on the other hand, the so-called snow heater processing machine that uses this 11 is usually used for textiles. used for.

However, in conventional processing machines, almost all parts are fixed and the path cannot be changed freely, the first heater is long, and when using a heating medium. etc., several spindles are made into one block, and because it is large and heavy, it is firmly fixed. The cooling loop 6 is also sufficiently long and fixed to reduce the yarn temperature entering the false twister 8 (usually measured at position 17 about 5 points upstream of the false twister 8) below the glass transition. However, the idea of freely changing the distance from the exit end to the entrance of the false twisting device 8 is a no-brainer.

In this regard, in the present invention, as shown in FIG. 2, the heater 4 is tilted or swung to form a heater 4', and the cooling plate 6 is also shortened as shown in 6'. This is $17 more than K
-i can be increased from the low temperature side to the high temperature side by the amount by which the cooling effect is reduced. At this time, it is convenient to make the first heater 4 swingable around the heater end 4E shown at 18 in FIG. This is 3 from K
There is no need to change the position of the feed roller, and as long as the guide 5 is also fixed to the heater 4, there is no particular problem. It is necessary to provide the cooling plate 6 with a length commensurate with the inclination angle of the heater 4, but usually two or three types are prepared.
good.

Also, the yarn temperature at this 6' length #i17 was measured and found to be 40°C and 110''C in the case of polyester.

All you need to do is prepare something that will heat up to around 140 degrees Celsius.

The above example describes the case where a cooling plate is provided in the cooling zone, but if you want to maintain the yarn temperature high and introduce it into a false twister, it is absolutely necessary to provide a cooling plate! ! Instead, the yarn temperature can be adjusted by changing the natural cooling length.

Further, as the false twisting tool, one suitable for POY-DTY processing is preferably used, particularly one having a feeding effect such as a one-disc friction type or a belt type.

As is clear from the above explanation, the present invention is provisional 11AK.
By swinging the first heater outlet end of the false twisting machine in order to change the heating state of the yarn to any desired temperature, the distance between the outlet end and the false twisting device can be changed arbitrarily. As a result, by changing the cooling length, the temperature of the yarn entering the temporary 1 mAK can be adjusted to the desired seismic intensity, and the processed yarn properties, especially the crimp rate.

The present invention provides a false twisting machine that can control molecular orientation, two fluffs, torque, and the like.

Normally, the yarn temperature leaving the first heater is close to the first heater set temperature (19 in the case of polyester fibers).
0~230℃, 170~200℃ for nylon 6 fiber
In conventional processing machines, the temperature of the false-twisted A front yarn was cooled to the glass transition temperature from this high temperature, but in the case of the present invention, the first heater is oscillated. By doing so, the cooling length can be shortened and the yarn temperature immediately before false twisting can be increased accordingly.

The yarn temperature can generally be changed within a range of 20°C to 190°C, but the range usually adopted during processing is 3°C.
The temperature ranges from 0°C to about 160°C, and this temperature may be determined depending on the characteristics and denier of the thermoplastic fiber to be processed and the desired processed yarn properties.

Regarding polyester fibers, which are currently used in the largest quantity, when trying to obtain fibers with emphasis on crimp rate and torque developed in boiling water for textile applications, the yarn temperature Fi1
Approximately 00 to 130°C is appropriate, and in knitting applications, fine crimps and low interlocking torque are often preferred. L, it may be carried out at about 20°C to 30°C.

In the preferred running pattern of the present invention, the yarn is heated at heating section 0 at its secondary transition temperature +10°C or higher (the upper limit is 15°C or higher).
0° C.) and introduced into a false twisting tool (original swing type) that has a feeding effect without substantially lowering this temperature.

For example, the second-order transition temperature of polyester (Tetron■) is 1
Since the temperature is 167°C, one cooling length may be adjusted so that the temperature of the polyester yarn introduced into the false twisting tool 8 is 77°C or higher.

Here, the meaning of maintaining the yarn temperature at 77° C., preferably 100° C. or higher (in the case of polyester) at the time of introduction into the false twisting tool 7 will be explained in relation to the false twisting tool having a feeding effect.

Any false twisting tool is its temporary 41II! The tool has the function of untwisting the heated yarn, and also has a tensioning (stretching) effect. Here, the spindle type is stretched by the untwisting tension, the friction false twister is stretched by the untwisting tension and its own feed effect, and the belt false twister is stretched by the 1IIIWC feed effect. Therefore, if the molecules are heated and cooled below the glass transition temperature, it is difficult for the molecules to move, so when stretching tension is applied, it becomes fluff.

The stitches are more likely to break. In order to make the yarn easily drawn during false twisting, the temperature of the yarn entering the false twisting tool must be at least above the glass transition, preferably at a temperature that exhibits α dispersion, which is the mechanical dispersion of polyethylene terephthalate (about 1!5°C). be.

This α dispersion is related to the movement of the amorphous portion.

If the yarn temperature becomes too high (exceeding 150° C.), even if the drawability is good, the crimped state will also be drawn, which is not preferable because the crimp rate will be lowered. The reason why the crimp rate is maximum at a certain yarn temperature is that when processed yarn with the amorphous part stretched to the extent that does not destroy the crimped shape is treated in boiling water, the amorphous part is It is thought that because the molecules are oriented, the shrinkage stress becomes large, which in turn increases the crimp-producing force and increases the crimp rate. For this reason, when the yarn is introduced into the friction false twisting device that has a feeding effect while maintaining the 77°C to 150°C rc as described above, the yarn will not be subjected to excessive tension (therefore, there is no risk of fuzz or yarn breakage). It is assumed that the fibers are properly oriented (% amorphous portion) in the direction of the false twisting, and that the crimp-producing ability is strengthened.

On the other hand, in a cooled yarn, the amorphous part is not stretched, and therefore the crimp-producing ability is lost due to the poor orientation caused by the treatment in boiling water, and the crimp rate is not expected to be very high. It will be done.

As described above, by using the false twisting machine of the present invention, the characteristics are gradually improved, and furthermore, these characteristics can be improved to the desired degree K.
Processed yarn with m knots coexisting can be produced. Moreover, it can be applied to the high-speed POY-DTY processing of the false-twisted I1 company, and at that time, compared to processing using a conventional DTY processing machine, the occurrence of fuzz and yarn breakage during the generation of untwisted yarn is reduced, and therefore stable processing is achieved. It also has an extremely large effect on the industrialization that is said to be possible.

The present invention will be explained below using examples.

Example: The intrinsic viscosity [η] was 0.63 and TlO was used as a matting agent at 0.
．． Spinning speed of polyethylene terephthalate containing 3% by weight:
The yarn was spun at 1500 m/min to obtain a highly oriented undrawn yarn of 225 denier and 48 filaments. Using this yarn, the second
Characteristics of one-heater processed yarn obtained by changing the inclination angle of the 11!1 heater in a false twisting machine having the function shown in the figure, and by installing a corresponding cooling plate 6' to change the yarn temperature at position 17. and process efficiency was evaluated. Machining speed is a
oom/min is constant, the temperature of the first heater is set at 220°C, which is considered to have the best crimp rate, and the number of twists at the position 503 from the first heater outlet is 2350 ± 20 iK. The so-called POY-DTY processing was performed at a feed roller 3 surface speed of 400 m for 7 minutes, ie, a stretching ratio of 1.5 times, by adjusting the surface speed of the friction disk 8 made of ceramic. Father, cooling plate length 6'
The yarn temperatures and textured yarn properties at No. 1 and No. 17 are shown in the table. (The distance between the first heater outlet end and the cooling plate 6 is 15a + 1. The distance between the cooling plate 6 outlet and the false twisting tool 8 is 20
It was set as es. ) As is clear from the table, when using the false twister of the present invention, the crimp rate and molecular orientation can be arbitrarily adjusted within a certain range, and from the viewpoint of process stability, it is possible to perform processing with a small number of fuzz. It is valid. It was also confirmed that this Δ1 company influences the texture of fabrics and is a superimposed factor along with TC. When this Δa is large, the width filling rate during the relaxation process during the fabric processing process is large, and the waist 1 resilience is improved. Also, TC is bulky and bulging 4EIIL.

It can be seen that while the conventional processing conditions correspond to A1 and 2, the physical properties of the processed yarn can be changed in various ways as shown in Fi43 to Fi47 of the present invention.

Incidentally, crimp ratio: 9, molecular orientation: 1 fluff were measured as follows.

(1) Measurement of crimp rate (TC) Take gK of processed yarn so that it becomes approximately 1500 d@, apply a light load of 2 kg per denier, process in seawater for 20 minutes, and then
After drying in a room at 0x654RH for 1 day and night, apply a heavy load of 200 IIv per denier and measure the length after leaving it for 1 minute, then change to heavy load t-#, 6 light load for 1 minute. Length 4t after standing was measured and calculated from the following formula.

Q) Calculation of molecular orientation Δn Apply a load of D 0.35 F per denier to the processed yarn.
Measure the sound wave propagation velocities S and V after seconds.

The measurement distance (distance between the oscillator and receiver) is 50 m, and the measuring device is a pulse type viscoelasticity stabilizer MODKL DDV- manufactured by Toyo Saiki.
5 was used.

8, v was measured in units of I[flI/sec, and Δn was calculated using the following formula.

Δn = 0.0408 X S, V + 0.0493 (
Evaluation of the number of fluffs It was expressed as the number of fluffs per 600 m of processed yarn, and was taken as the K and N values. Is the measuring device a fluff counter made by Komeshi Engineering? I used r stool.

[Brief explanation of the drawing]

Figure m1 is a route map of Takumi's saw heater false twisting machine, 42
The figure is a partially schematic diagram of a false twisting machine according to the present invention. 4.4' in Figure 111g2...Swiveling first heater b...
6. False twisting tool 18. Work floor.

Claims (2)

[Claims] (1) In a false-twisting machine in which a first heater and a false-twisting device are opposed to each other with a work floor in between, and a cooling zone is set above the work floor, the first heater is swingable, and the first heater is swingable, and a A false twisting machine that allows the cooling length up to the temporary grip to be set arbitrarily. (2) The false-twisting machine according to item 1, wherein the false-twisting tool has a feeding effect, and the desired range is %tF#14.