JP2582812B2 - High-speed false twisting method - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a high-speed false twisting method,
The present invention relates to a high-speed false twisting method which enables smooth twisting of m / min or more.

[Prior art] Conventionally, twisting-heat treatment-cooling-
In the false twisting process of untwisting, the heat treatment is performed by a contact running method using a dry heat plate, and the cooling is allowed to cool naturally in the air, or a cooling dry plate is used especially when a cooling device is provided. This was usually done in a contact running mode. And, the form of the false twisting machine having such a heat treatment section and a cooling section is generally configured such that a yarn path is largely bent in the dry heat plate for heat treatment or the dry plate for cooling due to space problems and workability. It was normal that it was. Of course, there are some false twisting machines in which these dry heat plates for heat treatment and dry plates for cooling are provided in a straight line, but they are not the mainstream in the industry because of their space and workability. .

On the other hand, in recent years, for the purpose of further improving productivity, the false twist processing speed tends to be gradually increased, and for example, it has been attempted to aim at ultra high speed processing of 1000 m / min or more. I have. However, when such ultra-high-speed processing is performed, heat setting processing is insufficient with a surface contact type heater such as a conventionally used electric heater, and the quality of the processed yarn cannot be maintained at the conventional level. .
Therefore, in this heat setting process, a heating means using a high-temperature fluid having a good heat transfer coefficient such as superheated steam or saturated steam is used.

On the other hand, in such ultra-high-speed machining, if a high-temperature fluid having a good heat transfer coefficient is used for the heating means and the yarn is heated sufficiently evenly, it takes a long time to dissipate heat, so that the device becomes unnecessarily long. is there. In order to avoid such an increase in the length of the device and to improve the heat setting efficiency, it is preferable that the yarn heat-treated with the high-temperature fluid be further actively cooled with a cooling fluid such as water.

However, in high-speed false twisting exceeding 1000 m / min or more, simply twisting the twisted yarn as described above with a high-temperature fluid and subsequently treating it with a cooling fluid will result in an expansion / contraction restoration rate and crimp development stress. It is difficult to satisfy various characteristics as a processed yarn, and yarn breakage frequently occurs during operation, and it is difficult to perform stable processing.

[Object of the invention]

The object of the present invention, in view of the conventional problems described above, 1000m /
It is an object of the present invention to provide a high-speed false twisting method capable of obtaining good processed yarn properties even at a high speed false twist exceeding a minute or more and performing a stable operation.

[Configuration of the invention]

In order to achieve the above object, the present invention provides a heating device, a cooling device, and a twister arranged in order in a yarn traveling direction between a supply roller and a take-off roller for continuously supplying and drawing a synthetic fiber yarn, and the twister upstream side. When performing heat treatment by the heating device and cooling by the cooling device in the twisting area, and performing false twisting to untwist at a high speed of 1000 m / min or more on the downstream side of the twister, the yarn in the twisting area Is performed in a high-temperature, high-pressure gas of superheated steam or saturated steam, and cooling of the yarn in the twisted area after the heat treatment is performed by adjusting the angle of the substantially straight yarn running direction and the angle in the high-temperature, high-pressure gas by 10 °. And in substantially the same yarn running direction.

The synthetic fiber yarn applied to the false twisting of the present invention is not particularly limited, and any fiber that can be false twisted can be applied. In particular, polyester fibers, polyamide fibers, and the like are suitably applicable.

In the present invention, the false twisting includes not only the case where the drawn yarn is false twisted, but also the case where the undrawn yarn or the highly oriented undrawn yarn (so-called POY) is drawn false twisted.

In the present invention, the heat treatment of the yarn in the twisting region is performed in a high-temperature and high-pressure gas of superheated steam or saturated steam. This heat treatment
1000m / m for processing in a gas with a higher density than the atmosphere
Even when the vehicle is run at a high speed for more than a minute, the yarn can be stably processed without causing yarn breakage, and the amount of heat required for the heat setting can be efficiently provided in a short traveling distance because of high temperature and high pressure.

Further, the cooling treatment of the yarn after the heat treatment is performed in a cooling liquid. Since it is a treatment in a liquid with extremely high density compared to the atmosphere, high-speed treatment of 1000 m / min or more can be performed stably without yarn breakage, as in the above heat treatment. Because of its large heat capacity, it can be rapidly cooled in a short traveling distance. As the liquid used for this cooling treatment, water is particularly optimal.

In this way, the heat treatment of the false twist region is performed with high temperature and high pressure gas of superheated steam or saturated steam, and then the cooling process is performed in the cooling liquid, so that the heat set of ultra high speed false twist of 1000 m / min or more can be performed in a narrow space. Efficiently and stably, the processed yarn characteristics such as the elasticity recovery ratio and the crimping stress can be brought to a satisfactory level.

Hereinafter, the present invention will be described with reference to the drawing false twisting apparatus to which the present invention is applied as shown in the drawings.

In FIG. 1, 2 is a supply roller, 8 is a take-up roller driven at a higher surface speed than the supply roller 2, and 9 is a take-up drive roller that takes up the processed false twisted yarn. Between the supply roller 2 and the take-up roller 8, a dry heat plate 3 heated by electric heat or a heat medium supply is provided.
In this order, a cylindrical heating device 5 having superheated steam or saturated steam and supplying a cooling liquid such as water, and a cylindrical friction device 6 including a belt nip type twister. By being arranged, a stretching false twist device is configured.

In this drawing false twisting apparatus, the highly oriented undrawn yarn Y wound on the package 1 is released by the supply roller 2,
The film is stretched while being taken up by a take-up roller 8 at an ultra-high speed of 1000 m / min or more, and is twisted on the upstream side by the surface friction twister 7 and untwisted on the downstream side. On the upstream side of the twister 7 to be twisted, the yarn Y is preheated by the dry heat plate 3 and then passes through the heating device 5, where it is heat-treated by a heating gas (superheated steam or saturated steam).
After this heat treatment, when passing through the cooling device 6, it is cooled by a cooling liquid (water). In this way, the yarn Y is twisted, heat-treated and cooled on the upstream side of the surface friction twister 7 and untwisted on the downstream side to form a false twisted yarn. Next, the package P is wound up from the take-up roller 8 by the take-up drive roller 9.

In the present invention, in the above-described twisting-heat treatment step,
As shown in FIG. 2, the yarn traveling direction as it passes through the cooling device 6 for the yarn traveling direction D _1, continues cooling treatment in the cooling fluid thereto as it passes through the heating device 5 for performing heat treatment in a heating fluid it is necessary to be substantially same direction and D _2. The term “substantially the same direction” in this case does not necessarily mean that safety is the same, but includes a case where the direction is changed by the guide 10 at a slight angle. That is, in the case that the angle θ formed by the yarn traveling direction D ₂ in the cooling fluid to the yarn traveling direction D ₁ of the in hot fluid within 10 °, and is substantially the same direction in the present invention. This angle θ is more preferably within 5 °,
Most preferably, it is set to 0 °, that is, it is configured to run in a straight line.

By heat treatment in this way the the yarn traveling direction D ₁ of the in high temperature fluid and the yarn traveling direction D ₂ of the cooling fluid substantially in the same direction, the yarn speed at the time of false twisting is 1000 m / min or more Even at a high speed exceeding, the stretch recovery ratio and crimp development stress exhibited by the false twisted yarn after processing can be made to a satisfactory level. Further, there is no occurrence of yarn breakage during false twisting, and stable operation can be performed.

Further, in the present invention, the distance between the heating device 5 and the cooling device 6 of the above-described stretching false twisting apparatus is preferably set to 20 cm or less, and particularly 10 cm for ultra-high-speed false twisting of 2000 m / min or more.
It is preferable that the distance be set to the following, and more stable operation can be performed by setting such an interval. That is,
In the present invention, the heat treatment of the yarn in a high-temperature fluid and the subsequent cooling immediately follow, depending on the yarn traveling speed, the interval between the heating device and the cooling device may be set to about several tens of cm, preferably 20 cm or less. It is good to set. Moreover,
The interval of the cooling device may be substantially zero by directly connecting the inlet of the cooling device to the outlet seal portion of the heating device.

The operability is improved by setting the distance between the heating device and the cooling device as described above, even if the yarn speed is as high as 1000 m / min or more, the yarn vibration is reduced and the tension fluctuation is reduced. This is because it hardly occurs. In other words, the twisted yarn being false-twisted is in an unstable state because it runs while rotating at high speed spirally at a twist density close to double twisting, but such an unstable twisted yarn is This is because the material is stabilized by contact with a high-temperature and high-pressure gas in a steam heating device or a cooling liquid in a cooling device having a higher density than the atmosphere.

Therefore, if the distance between the heating device and the cooling device is considered in the present invention, the yarn speed 1300
It is possible to operate stably even in the case of ultra-high-speed false twisting processing of over 2000 m / min, which exceeds 2000 m / min.

〔Example〕

A polyester multifilament yarn having a birefringence Δn of 0.037, an elongation of 180% and a circular cross section of 139 denier and 36 filaments was stretched over 2000 m / min by a draw false twist apparatus shown in FIG. 1 under the following conditions. High-speed false twist was performed.

In the above apparatus, saturated steam was used as the heating fluid of the heating device, and water was used as the cooling fluid of the cooling device.

Conditions: Take-up roller speed = 2000m / min Twister belt surface speed = 2740m / min Supply roller speed = 1047m / min Dry heat plate temperature = 220 ° C Temperature in heating device = 209 ° C (saturated steam pressure = 18atg) Cooling device Temperature = 25 ° C Stretching ratio = 1.91 times Twisting tension immediately before twister = 54 g Measured number of twists immediately before twister = 3300 T / m On the other hand, as a comparative example, a device was prepared in which the angle θ shown in Fig. 2 was set to 120 ° Then, high-speed false twisting was performed under the same processing conditions as in the above example except for the angle θ.

Various properties of the false twisted yarn obtained from the above examples of the present invention and comparative examples are as shown in the following table.

In addition, among the properties in the table, the expansion / contraction restoration rate was determined based on a test method of JIS L1090 for a sample pretreated under the following conditions.

Apply an initial load of 2 mg / d per indicated denier to the small case.

Next, the scab with the initial load suspended is immersed in hot water of 98 ± 1 ° C. for 20 minutes.

Take out the immersed scab and remove the initial load. Leave the scab still for about 12 hours or more so that the scab is not disturbed, and equilibrate with water.

The length l when an initial load of 2 mg / d per denier is applied to the yarn, and the initial load is further reduced to 0.
The length l ₁ when a load of 1 g is applied is measured, and the length is determined by the following equation.

The crimp onset stress (g) was measured using a crimp tester (CCT) manufactured by Rothshild under the following conditions.

Yarn speed: 16m / min Initial tension: 0.1g / d Overfeed rate: 4-8% Heater temperature: 150 ℃ As is clear from the above table, the false twisted yarn obtained from the comparative example has a lower strength, elongation, elasticity, and crimp development stress than the false twisted yarn obtained from the present invention, All of the characteristics were inferior.

Further, the false twisted yarn of the comparative example had many fluffs, and the yarn was frequently broken during the operation, so that stable processing for a long time was impossible.

(Effect of the Invention) The high-temperature false twisting method of the present invention, when false-twisting the synthetic fiber at 1000 m / min or more, heat-treats the yarn in the twisted area on the upstream side of the twister-cooling treatment, the heat treatment is superheated steam or The cooling process should be performed in a high-temperature, high-pressure gas of saturated steam and in a cooling liquid, and the running direction of the yarn in the cooling liquid should be substantially the same direction as the running direction of the yarn in the high-temperature, high-pressure gas within 10 °. By performing false twisting in the
Even with high-speed false twisting exceeding m / min or more, good processed yarn properties can be obtained, and stable operation without yarn breakage can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a stretch false twisting apparatus for carrying out the method of the present invention, and FIG. 2 is a cross-sectional view showing an enlarged part of the apparatus. 2 ... supply roller, 4 ... seal mechanism, 5 ... heating device, 6 ... cooling device, 7 ... twister, 8 ... take-up roller, 9 ... take-up drive roller, Y ... highly oriented unstretched yarn.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Teiyo Kojima 1-1-1, Sonoyama, Otsu City, Shiga Prefecture Toray Co., Ltd. Shiga Plant (56) References JP 50-123962 (JP, A) JP 54-68431 (JP, A)

Claims (5)

(57) [Claims] A heating device, a cooling device, and a twister are sequentially arranged in a yarn traveling direction between a supply roller and a take-off roller for continuously supplying and drawing a synthetic fiber yarn, and a twisting area on the upstream side of the twister is provided. In the heat treatment by the heating device and the cooling by the cooling device, when performing the false twisting to perform untwisting at a high speed of 1000 m / min or more on the downstream side of the twister, the heat treatment of the yarn in the twisted region is overheated. The heat treatment is performed in a high-temperature, high-pressure gas of steam or saturated steam, and the cooling of the yarn in the twisted area after the heat treatment is performed substantially within an angle of 10 ° or less with the substantially linear yarn running direction in the high-temperature, high-pressure gas. A high-speed false twisting method, wherein the method is carried out in a cooling liquid while maintaining the same yarn running direction. 2. The method according to claim 1, wherein the false twisting is a simultaneous drawing and false twisting in which the false twist is performed simultaneously with the stretching.
3. The high-speed false twisting method according to item 1. 3. The high-speed false twisting method according to claim 1, wherein the cooling liquid is water. 4. An interval between the heating device and the cooling device is 20.
The high-speed false twisting method according to any one of claims 1 to 3, which is not more than cm. 5. The high-speed false twisting method according to claim 1, wherein preheating by a dry hot plate is performed before the heat treatment with the high-temperature and high-pressure gas.