JPS6156332B2 - - Google Patents

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 multifilament crimped yarn (BCF) suitable as pile yarn for velor cut carpet. In recent years, the demand for tufted carpets has increased rapidly due to the good productivity of tufting, and the use of tufted carpets has generally progressed. The fashionability of this general carpet (for home use) is considered important, and velor-like cut carpet has recently become particularly popular. Due to its nature, such velor-like cut carpets are subject to 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 is required to have good robustness, that is, crimp fastness. Furthermore, when the tuft pile is cut, it becomes directional and streaks become noticeable after dyeing, so a crimped yarn with uniform dyeability is particularly required. In order to produce crimped yarn that satisfies the above-mentioned properties required for pile yarn for velour-like cut carpet, conventionally, the crimped yarn is crimped in a separate process under low tension or no tension for 50 minutes. ~20
Steam treatment (heat treatment) is performed for 1 minute.
However, although this method generally satisfies the characteristics required for velor-like cut carpet, it has the disadvantage of being very disadvantageous in terms of equipment productivity and cost because steam treatment is performed in a separate process. Furthermore, the chamber treatment process is a separate process from the crimping process, which has the disadvantage that unevenness is likely to occur. On the other hand, recent advances in crimping technology have made it possible to speed up the crimping process.
The production of crimped yarn (BCF) using the Draw Texturing process is underway. like this
In the SDT process, a press-crimping method using compressed heated fluid is used, which has excellent high-speed processing properties. As such a fluid-pressing crimping device, for example, the one described in Japanese Patent Application Laid-Open No. 53-45420 is suitable. However, the crimped yarn obtained by such an SDT process is not suitable as pile yarn for velor-like cut carpets. In other words, although it is possible to achieve uniform dyeing properties by linking processes (SDT), it is difficult to link heat treatment processes using steam, etc., and the crimp durability is low, and the conventional simple fluid pressing method If the crimp rate of the obtained crimped yarn is too high, the quality of the cut carpet will be significantly reduced.
(For example, the pile may become flattened or the velor feel may be lost.) The present inventors believe that in the case of indentation crimping using heated compressed fluid, especially in indentation crimping at high speeds,
In order to stably produce a crimped yarn suitable as a pile yarn for velor-like cut carpet, the present invention was arrived at as a result of intensive studies. 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 being moved in the opposite direction and being unwound or unwound in the retention control chamber is heat-treated with a heated fluid, and the heated fluid that is spouted 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 heated by 0 to 20
% overfeed into a pipe-shaped chamber, and post-heat treatment in the chamber with a heated fluid produces a highly productive crimped yarn with low crimpability suitable as pile yarn for velor-like cut carpets. It is designed to be manufactured stably. 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 apparatus showing an embodiment in which the present invention is applied to an SDT process in which spinning, drawing, and crimping are directly connected, and FIG. FIG. 3 is a longitudinal cross-sectional view showing one embodiment of the chamber. In FIG. 1, a yarn Y is introduced into a heated fluid injection nozzle 1, and a heated fluid outlet 2 of the nozzle 1 is introduced.
It is injected together with the compressed heating fluid supplied from a and 2b and sent to the stuffing chamber 5. The stuffing chamber 5 is comprised of a cylindrical or truncated conical space surrounded by a plurality of blade plates 4 arranged radially from the center toward the outer circumference. Note that the upper end of each blade plate 4 is fixed to the flanges 3a, 3b. The heated fluid is separated from the yarn in this stuffing chamber 5 and discharged to the outside of the system through radial slits formed in the gaps between the blade plates 4, while the yarn collides with the yarn mass already deposited and winds up. The fibers are compressed and buckled and deposited on their own 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, fluid blow-off holes 8a and 8b are provided on the downstream side of the retention adjustment chamber 6, from which a heating fluid for yarn heat treatment is blown into the retention adjustment chamber, and at least a portion of the fluid is supplied to the yarn inside the retention adjustment chamber. The heating fluid is moved in a direction opposite to the traveling direction of the yarn (that is, toward the upstream side) 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 heating fluid discharge hole 7 is not provided and the heating fluid for heat treatment is not discharged, the heating fluid for heat treatment will be ejected downstream together with the yarn, or will flow into the stuffing chamber against the movement of the piled yarn mass. 5 and is discharged from the circumferential surface of the chamber, which is not preferable because it not only makes the movement (running) of the deposited yarn mass unstable, but also causes uneven processing. In addition, in the above-mentioned method, the heating fluid for crimping supplied to the injection nozzle 1 and the blowing holes 8a, 8
The heating fluid for yarn heat treatment that is blown into the retention control chamber 6 from b is high temperature (100 to 300° C.) air or steam. 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. The above-mentioned fluid pressing crimping apparatus in which the retention adjustment chamber 6 is connected to the downstream side of the stuffing chamber 5 is described in Japanese Patent Application Laid-Open No. 53-45420 or 1987-156846. If the yarn is cooled with cooling air or water in the retention chamber as shown in these publications, crimp strain remains in the yarn, and only a highly crimped yarn can be obtained, which is contrary to the purpose of the present invention. do not have. 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 high degree of crimp imparted and the existing strain are removed, and a crimped yarn with a low degree of crimp is obtained. Moreover, by selecting the flow rate, temperature, etc. of the heating fluid, the degree of crimp of the crimped yarn can be adjusted relatively easily. Further, in the present invention, as described above, the crimped and heat-treated yarn is taken from the retention adjustment chamber, introduced into a pipe-shaped chamber in a state of 0 to 10% overfeed, and heated within the chamber. Post-heat treatment with fluid. At this time, the post-heat treatment in the pipe-shaped chamber is
In order to increase the efficiency, heat treatment in a relatively closed system is preferable, and in particular, it is preferable to appropriately select the inner diameter (dmm) of the yarn introduction hole and discharge hole of the chamber depending on the fineness De (denier) of the crimped yarn. . That is, according to the research of the present inventors, the inner diameter (dmm) of the yarn introduction hole and the discharge hole of the pipe-shaped chamber is 0.023√≦d≦0.023√＋0 relative to the fineness (De) of the crimped yarn. 5 However, it is preferable to satisfy 400≦De≦6000; if the above-mentioned d is too small relative to the fineness (De) of the crimped yarn, the yarn will not run smoothly; on the other hand, if it is too large, it will not be suitable for heat treatment. There is a tendency that sufficient heat treatment cannot be performed due to leakage of heating fluid. It is preferable to use steam as the heating fluid for heat treatment of the pipe-shaped chamber in order to improve its heat set. Here, either saturated steam or superheated steam may be used, and there is no significant 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. A short time (for example, about 0.01 to 0.1 seconds) is sufficient for the post-heat treatment in the chamber. Further, during the post-heat treatment in the pipe-shaped chamber, it is necessary to heat-treat the crimped yarn taken out from the fluid-injection crimping device under an overfeed state of 0 to 10%. 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 resulting crimped yarn has a high boiling water absorption rate. This results in disadvantages such as: On the other hand, with a high overfeed of 10% or more, the yarn becomes slack and cannot be pulled out. 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 order to take advantage of its high-speed processability, crimped yarn can be produced by the SDT process, which directly connects the spinning, drawing, and crimping processes. It is particularly advantageous when applied to the production of. In this case, the crimping speed is high from 2000 to 400 m/min, but it is possible to give sufficient heat treatment effect to the yarn, and the crimped yarn has a low crimp rate and is suitable as pile yarn for velour-like cut carpet. It becomes possible to do this. Figure 2 shows an example of such an SDT process.
1, the spinning take-off roller 12
Then, it is wound around the separation roller 12' several times and taken off. Subsequently, it is wound several times around the rollers 12, 12' and a pair of stretching rollers 13, 13', and stretched to a predetermined stretching ratio of 3 to 5 times between the rollers 12 and 13, 13'. roller 13,1
3' 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 transferred to a fluid forced crimping device 14.
It is introduced at an overfeed of 15-40% and crimped at this point. As shown in FIG. 1, this fluid-injection crimping device 14 is designed to blow heated fluid into a retention chamber, and heat treatment is performed in this device 14 after crimping. The yarn thus crimped is taken off by the first take-up roller 15 and separation roller 15', and then between the rollers 15, 15' and the second take-up roller 17 and separation roller 17'. It is introduced into an installed pipe-like chamber 16, where it is subjected to a post-heat treatment (post-heat setting) using a heating fluid. At this time, rollers 15, 15' and rollers 17, 1
7', an overfeed (relaxation) of 0 to 10% (preferably 1 to 5%) is applied, and the yarn is post-heat treated with some shrinkage. The yarn thus subjected to multi-stage heat treatment is sufficiently cooled with cooling air, cooling water, etc. as required, and then wound up in a winder 18. FIG. 3 shows such a pipe-like chamber 16.
This is a longitudinal cross-sectional view showing an example, and the chamber is provided with a yarn introduction hole 16a and a yarn discharge hole 16b having an inner diameter of dmm that satisfies the above-mentioned conditions at both ends, and a heated fluid introduction hole 16c on the side surface. . In addition,
In order to facilitate threading work, this chamber 16 preferably has a half-split structure that can be divided into halves in the longitudinal direction. The yarn to which the method of the present invention is applied is preferably a polyamide multifilament yarn, especially one with a denier of 400 to 6000 de after crimping, 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 quadrangular shape. According to the present invention as described above, it is possible to stably produce crimped yarn (BCF) having crimp characteristics suitable as pile yarn for velour-like cut carpet at high speed. It is possible to achieve significant cost reduction 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 (TC ₀ ), crimp fastness (TC ₅ ) The crimp ratio TC ₀ and crimp fastness TC ₅ were determined as follows. In other words, the crimped yarn has a certain length,
This sample was treated in boiling water for 20 minutes and dried.
The length when a load of 0.1 g/de is applied is ₁ ,
Next, the length when applying a load of 2 mg/de _{is 2}
In this case, the value is calculated from the formula: TC ₀ = ₁ − ₂ / ₁ × 100 (%). In addition, when TC ₅ is treated in boiling water for 20 minutes,
In TC ₁ , no load was applied to the yarn being processed, whereas in TC ₅ , a load of 5 mg/de was applied. (2) Overfeed rate The overfeed rate (OF ₁ ) to the fluid forced crimping nozzle is a value based on the following formula. Assuming that the speed of the stretching rollers 13, 13' in FIG. 1 is R _v3 and the speed of the first take-up roller 15 is R _v5 , the overfeed rate (OF ₁ ) = R _v3 - R _v5 / R _v5 × 100 (%) Also, the overfeed rate (OF ₂ ) in the pipe-shaped chamber is determined as follows, as described above, assuming that the speed of the second take-up roller 17 located further downstream is R _v7 Overfeed rate (OF ₂ ) = R _v5 − R _v7 / Defined as R _v7 ×100 (%). Example 1 After spinning poly-ε-caproamide using the direct spinning drawing and crimping apparatus shown in FIG. The material was fed to the fluid pressure crimping device shown in Fig. 1 at an overfeed rate of 25% and crimped. The pressure of the heated fluid (steam) in the retention control chamber 6 of the apparatus was 4.0 Kg/cm ² and the temperature was 200°C. Subsequently, the yarn was supplied to the pipe-shaped chamber shown in FIG. 3 at an overfeed rate of 4%, and post-heat setting was performed under conditions of a heating fluid (steam) pressure of 3.5 kg/cm ² and a temperature of 200°C. The crimp rate of the obtained crimped yarn was suitable for use in cut carpets, and the crimp fastness, size, and stability were 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 (TC ₀ ), crimp fastness (TC ₅ ), 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 a little low, the crimp rate of the crimped yarn obtained was a little high, and the quality of the carpet properties was also a little low. However, at the superheating temperature, the crimp rate was sufficiently low, 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 of the pipe-shaped chamber. The results are shown in Table 1. 1st
As is clear from the table, whether the steam temperature of 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 it varies depending on the characteristics of the crimped yarn you are trying to obtain, but if you are trying to obtain a crimped yarn for velor-like cut carpet, a pressure of about 3.5 kg/cm ² is recommended. It turned out that. Comparative Example The 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. 【table】

[Brief explanation of the drawing]

FIG. 1 is a simplified vertical cross-sectional view showing an example of a fluid pressing crimping device used in the present invention.
is a heated fluid injection nozzle; 5 is a stuffing chamber; 6 is a stuffing chamber;
8a and 8b are heating fluid blowing holes for yarn heat treatment. FIG. 2 is a schematic side view of a direct spinning drawing and crimping device showing an example of applying the present invention to the SDT process, in which 13 and 13' are drawing rollers, 14 is a fluid pushing crimping device, and 15 is a 1 take-up roller, 16
1 is a pipe-shaped chamber, and 17 is a second take-up roller. FIG. 3 is a longitudinal sectional view showing an example of a pipe-shaped chamber.

Claims (1)

[Scope of Claims] 1. The yarn is ejected together with a heated fluid into the stuffing chamber, and the yarn is compressed and deposited in the stuffing chamber to give a crimp to the yarn, and a retention area is connected to the downstream side of the stuffing chamber. When manufacturing crimped yarn by unwinding and taking the compressed piled yarn in the adjustment chamber, a heating fluid is supplied into the retention adjustment chamber, and at least a part of the heating fluid is directed in the direction of yarn travel. The yarn that is being unwound or the yarn that has been unwound in the retention control chamber is heat-treated by the heated fluid, and the heated fluid that is ejected into the stuffing chamber together with the yarn is heated against 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 system, and the crimped yarn taken from the retention adjustment chamber is further heated by 0 to 10
A method for producing crimped yarn, which comprises introducing the crimped yarn into a pipe-shaped chamber in a state of % overfeed, and post-heat-treating the yarn in the chamber with a heated fluid. 2. The manufacturing method according to claim 1, wherein steam is used as the heating fluid supplied into the retention control chamber. 3. Claim 1 in which the inner diameter (dmm) of the yarn introduction hole and yarn discharge hole of the pipe-shaped chamber is adjusted within a range that satisfies the following formula with respect to the fineness (De) of the crimped yarn. Manufacturing method described in section. 0.023√≦d≦0.023√＋0.5 [However, 400≦De≦6000]