JPS5994633A - Production of crimp processed yarn - 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 relates to a method for producing crimped yarn. More specifically, the present invention relates to a method for producing a multifilament crimped yarn (CBCF) suitable as a pile yarn for velor-like cut carpets.

In recent years, the demand for tufted carpets has increased rapidly due to the high productivity of tufting, and the use of tufted carpets has progressed to general carpets. This general carpet (for home use) is valued for its fashionability, and recently velour-like cut carpets have been particularly popular. Due to its nature, such velor-like cut carpets have several high requirements. First, in order to maintain the velor feel of a cut carpet, a crimped yarn with a low crimp rate is required as a pile yarn. Secondly, if the durability of the cut pile is poor, the cut pile will sag after being used for a short period of time, so the pile yarn must be strong, that is, the crimping is strong. Furthermore, when the tuft pile is cut, it becomes directional and streaks after dyeing tend to stand out, so a crimped yarn with uniform dyeability is especially required.

In order to produce crimped yarn that satisfies the above properties required for pile yarn for velor-like cut carpets, conventionally, the crimped yarn is processed in a separate process under low tension or no tension. Steam treatment (heat treatment) is performed for 5 to 20 minutes. However, although this method generally satisfies the characteristics required for velor-like cut carpet, it has the disadvantage of being extremely disadvantageous in terms of equipment productivity and cost because steam treatment is performed in a separate process. Furthermore, the steam treatment process is a separate process from the crimping process, which has the disadvantage that spots are likely to occur.

On the other hand, recent advances in crimping technology have made it possible to speed up the crimping process, making it possible to perform so-called SDT (Spin-Draw-T), which combines the processes of spinning, drawing, and crimping.
BACKGROUND ART BACKGROUND ART BACKGROUND ART BACKGROUND ART The production of crimped yarn (BCF) by a process of In such an SDT process, an indentation crimp method using compressed and heated fluid, which is excellent in high-speed processability, is employed. As such a fluid pressure crimping device, for example, the one described in Japanese Patent Application Laid-Open No. 53-45420 is suitable. However, such SDT
The crimped yarn obtained by this process is unsuitable as pile yarn for velor-like cut carpets. In other words, although it is possible to achieve uniform dyeability by linking the processes (SDT conversion), it is difficult to link the heat treatment process using steam, etc., and the crimp durability is low, and the conventional simple fluid pressing method In this case, the crimp rate of the obtained crimped yarn is too high, resulting in a significant decrease in the quality of the cut carpet. (e.g. vi, /'Inole's sagging occurs,
The present inventors have developed a crimped yarn suitable as a pile yarn for velor-like cut carpets in a press-crimping process using heated compressed fluid, especially at high speed. The present invention was arrived at as a result of extensive research in order to stably produce the following. That is, the present invention jets the yarn together with a heated fluid into the stuffing chamber, compresses and deposits the yarn in the stuffing chamber, and imparts crimps to the yarn, and also provides a retention control system connected to the downstream side of the stuffing chamber. When producing crimped yarn by unwinding and taking the compressed piled yarn in the chamber, a heated fluid is supplied into the retention adjustment chamber, and at least a part of the heated fluid is directed in the direction of travel of the yarn. The yarn is moved in the opposite direction and the yarn being unwound in the retention control chamber or the unwound yarn is heat-treated with a heated fluid, and the heated fluid that is ejected into the stuffing chamber together with the yarn is used to remove the yarn from the circumferential surface of the stuffing chamber. On the other hand, the heated fluid supplied into the retention adjustment chamber is discharged from the circumferential surface of the retention adjustment chamber to the outside of the yarn, and the crimped yarn taken from the retention adjustment chamber is further reduced by 0 to 20%. By introducing it into a pipe-shaped chamber in an overfeed state and post-heat-treating it with a heated fluid in the chamber,
A crimped yarn with low crimpability suitable as a pile yarn for velor-like cut carpets is stably produced with high productivity.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a simplified longitudinal cross-sectional view showing one embodiment of the fluid-pressing crimping device used in the present invention. Furthermore, FIG. 2 is a schematic side view of a direct spinning, drawing, and crimping device showing an embodiment in which the present invention is applied to an SDT process that directly connects spinning, drawing, and crimping, and FIG. 3 is a schematic side view of a pipe used in the present invention. FIG. 2 is a longitudinal cross-sectional view showing one embodiment of a shaped chamber.

In FIG. 1, the yarn Y is introduced into the heated fluid injection nozzle 1, and is injected together with the compressed heated fluid supplied from the heated fluid blowing holes 2a and 2b of the nozzle 1, and is ejected into the stuffing chamber 5.
sent to. The stuffing chamber 5 consists of a cylindrical or truncated conical space surrounded by a plurality of vanes 4 arranged radially from the center toward the outer circumference. Note that the upper and lower ends of each vane plate 4 are fixed to flanges 3a and 3b. The heating fluid is separated from the yarn in this stuffing chamber 5 and discharged out of the system through radial slits formed between the blade plates 4, while the yarn moxibustion collides with the already accumulated yarn mass and winds it up. It is given shrinkage, and it also buckles and accumulates to form a filament mass. Subsequently, the yarn mass is transferred to the retention control chamber 6, where it is unwound and taken off.

In the present invention, a fluid blowout hole 8 is provided on the downstream side of this retention control chamber 6.
a, 8b are provided, from which heating fluid for yarn heat treatment is blown into the retention adjustment chamber, and at least a part of it is directed in the direction opposite to the traveling direction of the yarn in the retention adjustment chamber (i.e., toward the upstream area).
The heating fluid is moved to heat-treat the yarn that is being unwound or the yarn that has been unwound. The heated fluid is then discharged to the outside of the system through a large number of heated fluid discharge holes 7 provided on the circumferential surface of the retention control chamber 6.

If the heated fluid discharge hole 7 is not provided and the heated fluid for heat treatment is not discharged, the heated fluid for heat treatment will be ejected to the downstream side together with the yarn, or the heated fluid for heat treatment will flow into the stuffing chamber 5 against the movement of the piled yarn mass. This is not preferable because it not only makes the movement (travel) of the deposited yarn mass unstable, but also causes uneven processing.

In the above method, the heating fluid for crimping supplied to the injection nozzle 1 and the heating fluid for yarn heat treatment blown into the retention adjustment chamber 6 from the blow-off holes 8a and 8b are heated to a high temperature (10
Air or steam at a temperature of 0 to 300°C is used. The latter heating fluid is preferably steam, which has good heat treatment efficiency. In particular, superheated steam is most suitable for achieving a sufficient heat treatment effect, and its temperature is preferably 180 to 220°C.

A fluid pressing crimping apparatus in which a retention adjustment chamber 6 is connected to the downstream side of the stuffing chamber 5 as described above is disclosed in Japanese Patent Application Laid-Open No. 53-454.
No. 20 or Japanese Patent Application Laid-open No. 156846/1984, if the yarn is cooled with cooling air or water in the retention chamber as shown in these publications, crimp strain will occur in the yarn. remains, and only a highly crimped yarn can be obtained, which is contrary to the purpose of the present invention. However, as described above, by blowing a heated fluid from the downstream side of the retention control chamber 6 and heat-treating the yarn that is being unwound from the piled yarn mass or the unwound yarn with the heated fluid, it is possible to The applied high degree of crimp and remaining distortion are removed, and a crimped yarn with a low degree of crimp is obtained. Moreover, the flow rate of the heating fluid. By selecting the temperature, etc., the degree of crimp of the crimped yarn can be adjusted relatively easily.

Furthermore, in the present invention, as described above, the crimped and heat-treated yarn is taken from the retention adjustment chamber and
The sample is introduced into a pipe-shaped chamber in an overfeed state, and is subjected to post-heat treatment in the chamber with a heated fluid.

At this time, in order to increase the efficiency of the post-heat treatment in a pipe-shaped chamber, it is desirable to perform the heat treatment in a relatively closed system.
is preferably selected appropriately depending on the fineness De (denier) of the crimped yarn.

That is, according to the research of the present inventors, the inner diameter (dmrn) of the yarn introduction hole and the discharge hole of the pipe-shaped chamber is 0.0 2 3\5≦d with respect to the fineness (De) of the crimped yarn. ≦0.02 3 + 0.5 However, it is preferable to satisfy 400≦De≦6000. If d is too small compared to the fineness (De) of the crimped yarn, the yarn will not run smoothly. On the other hand, if it is too large, there is a tendency that sufficient heat treatment cannot be performed due to leakage of the heating fluid for heat treatment.

It is preferable to use steam as the heating fluid for heat treatment in the pipe-shaped chamber in order to improve its heat setting property. Here, either saturated steam or superheated steam may be used, and there is no big difference in the heat treatment effect. However, with saturated steam, there is a concern that spots may occur due to temperature and pressure fluctuations caused by the generated condensate, so it is preferable to overheat the steam. The post-heat treatment time in the chamber is short (for example, 0.01
~0.1 seconds) is sufficient.

In addition, during post-heat treatment in a pipe-shaped chamber, the crimped yarn taken out from the fluid compression crimping device was
% overfeed is required. In the draft state, the uniformity of heat treatment is good, but since the yarn is set in a strained state, the strain remains, and for example, the boiling water shrinkage of the resulting crimped yarn increases, etc. resulting in disadvantages. On the other hand, with a high overfeed of 10% or more, the yarn becomes slack and cannot be taken off.

A desirable overfeed range is 1-5%. If the post-heat treatment is carried out in such an overfeed state, the distortion of the crimped yarn produced during the pressing process can be removed, the crimp rate is reduced, and the dimensional stability is also very good.

The method of the present invention is useful for high-speed crimping, and in the sense that it takes advantage of its high-speed processability,
It is particularly advantageous to apply this method to the case where a crimped yarn is produced by an SDT process in which each process of drawing and crimping is directly connected.

In this case, the crimping speed is 2,000 to 4,000 m/min, but it is possible to give sufficient heat treatment effect to the yarn, and the crimping rate is low, making it suitable for pile yarn for velour-like cut carpets. It becomes possible to make it into thread.

FIG. 2 shows an example of such an SDT process, in which the spun yarn S is treated with an oil agent by an oiling roller 11, wound several times around a spinning take-off roller 12 and a separation roller 12', and taken off. .

Subsequently, the film is wound several times around roller 1-2.12' and a pair of stretching rollers 13.13'K, and stretched to a predetermined stretching ratio of 3 to 5 times between roller 12 and roller 13.13'. Cora 13.13' is preferably heated to 160 to 210°C in order to heat-treat the yarn and preheat for crimping. Following the drawing heat treatment, the yarn is introduced at a 15-40% overfeed into a fluid forced crimping device 14 where it is crimped. As shown in FIG. 1, this fluid forced crimping device 14 is configured to blow heated fluid into a retention adjustment chamber, and heat treatment is performed in this device 14 after crimping is applied.

The yarn crimped in this way is transferred to the first take-up roller 1.
5 and a separation roller 15', and then introduced into a pipe-shaped chamber 16 installed between said rollers 15, 15' and a second take-off roller 17 and a separation roller 17', where it is subjected to post-heat treatment by means of a heated fluid. (post heat set) is applied. At this time, roller 15
．． 15' and roller 17.17' between 0 and 10% (
An overfeed (relaxation) of preferably 1-5% is provided and the yarn is post-heat treated with some shrinkage. The yarn thus subjected to the multi-stage heat treatment is sufficiently cooled with cooling air, cooling water, etc. as required, and then wound in the winder 18.

FIG. 3 is a longitudinal cross-sectional view showing an example of such a pipe-shaped chamber 16, and the chamber is provided with a yarn introduction hole 16a and a yarn discharge hole 16b having an inner diameter of dmm and satisfying the above-mentioned conditions at both ends. A heating fluid introduction hole 16c is provided on the side surface. Note that, in order to facilitate the threading operation, the chamber 16 preferably has a half-split structure that can be divided into halves in the longitudinal direction.

Yarns to which the method of the present invention is applied include polyamide multifilament yarns, especially those having a denier of 400 to 6000 de after crimping;
is preferred, but other synthetic fiber multifilament yarns may also be used. Further, the multifilament yarn may include single fibers having different dyeability, filament cross-sectional shape, denier, etc. It is preferable that the single fiber has a non-circular cross section such as a trilobal shape, a triangular shape, or a square shape.

According to the present invention as described above, the crimped yarn (
BCF) can be produced stably at high speed, and compared to conventional long-term heat treatment methods, it is possible to achieve significant cost reductions and uniform quality.

Next, Examples and Comparative Examples will be shown to explain the present invention in more detail. Here, "crimping rate", "crimping fastness", and "overfeed rate" are values defined as follows.

(1) Crimp ratio (TCo) and crimp fastness (TC) The crimp ratio TC0 and crimp fastness TC were determined as follows.

In other words, a certain length of crimped thread is taken, and the sample is soaked in boiling water for 2 hours.
The value obtained from the formula where the length when a load of 0.1 g/de is applied after drying after 0 minute treatment is l1, and the length when a load of lg/de is then applied is l2. It is.

In addition, when TC, is treated in boiling water for 20 minutes, TCo
In TC, no load is applied to the yarn being processed, whereas in TC,
The test was carried out with a load of 5"!?/de applied.

(2) Overfeed rate Overfeed rate (OF
1) is a value based on the following formula.

The speed of the stretching roller 13.13' in FIG. 1 is Rv
If the speed of the first take-up roller 15 is Rv, then the overfeed rate (OF
, ) is defined by assuming that the speed of the second take-up roller 17 located further downstream is Rv7, as described above.

Example 1 Poly-ε-
After spinning caproamide, the spun yarn is drawn at a speed of 2750 m/
The yarn was drawn to a yarn of t3ooae/68fil, which was then fed to the fluid pressure crimping apparatus shown in FIG. 1 at an overfeed rate of 25 to perform crimping. The pressure of the heated steam in the retention control chamber 6 of the device is 4.
OKP/d, temperature was 200 °C. Next, the yarn was supplied to the pipe-shaped chamber shown in Fig. 3 at an overfeed rate of 4%, and the pressure of the heating fluid (steam) was increased to 3.5%.
K9/crl. Post heat setting was performed at a temperature of 200°C. The crimp rate of the obtained crimped yarn was suitable for use in cut carpets, and the crimp stability and dimensions were good. The stability was also good. The cut carpet obtained by tufting this was of extremely good quality and free of streaks. Table 1 shows the evaluation results of the crimp rate (TCQ), crimp fastness (TC,), and cut carpet of the obtained crimped yarn (nylon BCF).

Examples 2 to 4 Silk spinning and crimping were carried out under exactly the same conditions as in Example 1, except for the temperature and pressure of the heating fluid (steam) in the retention control chamber 6 of the apparatus shown in FIG. The results are shown in Table 1. When the temperature of the heating fluid was saturated, the heat treatment effect was slightly low, the crimp rate of the obtained crimped yarn was slightly high, and the carpet properties were also of slightly low quality. However, the crimp rate was sufficiently low at the overheating temperature, and the effect of changing the pressure was also relatively small.

Examples 5 to 9 Silk spinning and crimping were carried out under exactly the same conditions as in Example 1, except for the steam temperature and pressure in the pipe-shaped chamber. The results are shown in Table 1.

As is clear from Table 1, whether the steam temperature in the pipe-shaped chamber is saturated or overheated, its contribution to the heat treatment effect is small. On the other hand, the effect of steam pressure is remarkable, and although it varies depending on the characteristics of the crimped yarn to be obtained, when trying to obtain crimped yarn for velor-like cut carpets, the pressure is around 3-5 Kp/cl. It turned out to be good.

Comparative Example The yarn spinning process was carried out under exactly the same conditions as in Example 1, except that no heating fluid was used in the retention control chamber of the fluid forced crimping apparatus. The crimped yarn obtained here had a high crimp rate as shown in Table 1, and the quality of the carpet was poor.

[Brief explanation of the drawing]

FIG. 1 is a simplified vertical cross-sectional view showing an example of a fluid pressing crimping apparatus used in the present invention, in which 1 is a heated fluid injection nozzle, 5 is a stuffing chamber, 6 is a retention adjustment chamber, 8a,
Rb is a heating fluid blowing hole for yarn heat treatment. FIG. 2 is a schematic side view of a direct spinning drawing and crimping apparatus showing an example of applying the present invention to an SDT process, and 1.3.
13' is a stretching roller, 14 is a fluid pressing crimping device,
15 is the first coke, 16 is a pipe-shaped chamber, 1
7 is a second take-up roller. FIG. 3 is a longitudinal sectional view showing an example of a pipe-shaped chamber.

Claims (3)

[Claims] (1) The yarn is ejected together with heated fluid into the stuffing chamber, and the yarn is compressed and deposited in the stuffing chamber to give the yarn a crimp. When manufacturing a crimped yarn by unwinding and taking a compressed piled yarn, a heating fluid is supplied into the retention chamber, and at least a portion of the heating fluid is directed in a direction opposite to the traveling direction of the yarn. Let me move,
The yarn that is being unwound or the yarn that has been unwound in the retention control chamber is heat-treated with a heating fluid, and the heating fluid that is spouted into the stuffing chamber together with the yarn is discharged from the circumferential surface of the stuffing chamber to the outside of the system. The heated fluid supplied into the retention adjustment chamber is discharged from the circumferential surface of the retention adjustment chamber to the outside of the system, and the crimped yarn taken from the retention adjustment chamber is further heated into a pipe shape with an overfeed of 0 to 10%. Introduced into the chamber,
A method for producing crimped yarn, which comprises performing a post-heat treatment with a heated fluid in the chamber. (2) The manufacturing method according to claim (1), wherein steam is used as the heating fluid supplied into the retention control chamber. (3) A claim that adjusts the inner diameter (dmm) of the yarn introduction hole and the yarn discharge hole of the pipe-shaped chamber within a range that satisfies the following formula with respect to the fineness (De) of the crimped yarn. The manufacturing method described in paragraph (1). o. o23Jm≦d≦0.02 3,5+ o,s[
However, 400≦De≦6000:1