JPS6317134B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for crimp yarn, and its purpose is to produce a crimp yarn having an irregular three-dimensional curved shape with high efficiency and stability. In recent years, because it is possible to perform high-speed processing and make the equipment more compact when crimping yarn, so-called crimping methods have been developed in which the yarn is forced into a compression chamber with heated compressed fluid using a heated fluid injection nozzle. Fluid forcing methods are being considered. That is, according to the fluid pushing method, the yarn can be efficiently crimped by plasticizing and agitating the yarn by the heated compressed fluid in the heated fluid injection nozzle, and shaping the yarn when it is pushed into the compression chamber. High-speed machining is possible. Further, since the crimping device is also connected to the heated fluid injection nozzle and has a compression chamber, the equipment can be made extremely compact. However, in the fluid pushing method, the starting point of pushing the yarn into the compression chamber (the distance from the nozzle to the yarn mass already pushed into the compression chamber), the packing density, the retention and unwinding point, or the cooling method of the yarn The quality of the crimped yarn (crimping rate, number of crimping, crimping elasticity, etc.) changes due to various methods, making it difficult to stably obtain a homogeneous product. Based on these points of view, the yarn is crimped and fixed by blowing cooling fluid (cooling gas) into the compression chamber against the direction in which the yarn is pulled out, and the yarn is crimped and fixed in the compression chamber by the back pressure of the cooling fluid. A method (and device) for promoting crimping has been proposed (Japanese Patent Application Laid-Open Nos. 47-25450 and 49
- No. 71242, No. 50-123962, Special Publication No. 50-33176, etc.) However, since these methods discharge both the heated compressed fluid and the cooling fluid from the compression chamber, it is difficult to adjust the pressure balance of both fluids within the compression chamber. Variations are likely to occur in the starting point of yarn indentation, packing density, retention and unwinding point, etc. In order to prevent these phenomena, a method has been proposed in which a pressure regulating valve is provided at the fluid outlet of the compression chamber to adjust the pressure of both fluids in the compression chamber (Japanese Patent Laid-Open No. 47-25450). is complicated and has practical problems. In addition, in these methods, a method has also been proposed in which the cooling fluid, particularly water, is added in a finely dispersed form of mist to promote cooling and crimp fixation of the yarn. However, according to studies conducted by the present inventors, spraying a mist of water onto the unwound crimped yarn cannot be expected to have the expected effect, and the resulting crimped yarn has no oily effect. It was found that the tufting properties were poor when used as a carpet because the pick-up amount was reduced. The present inventors conducted further intensive studies based on these findings, and as a result, they arrived at the present invention. That is, the present invention is a yarn crimp method comprising the following combinations (a) to (d). (b) Pushing the yarn into a compression chamber connected downstream of the nozzle by heated compressed fluid injected from a heated fluid injection nozzle; (B) Retention of the yarn in the compression chamber connected downstream of the compression chamber (c) directing the heated compressed fluid to a control chamber and blowing cooling gas into the chamber from the downstream side of the retention control chamber to cause the cooling fluid to flow in a direction opposite to the running direction of the yarn; (c) directing the heated compressed fluid from the compression chamber; (d) The finished oil consisting of a smoothing agent, an antistatic agent, a coloring agent, etc. is added to the threads existing in the compression chamber and/or the retention adjustment chamber in water using a surfactant, etc. Blowing in an emulsion that has been emulsified and dispersed. Threads applicable to the present invention include thermoplastic synthetic fibers such as polyamides such as poly-ε-caprolactam and polyhexamethylene adipamide, polyesters, and polyvinyls. Also, the fineness is not particularly limited, but it is 500~
5000 de is desirable. The present invention will be described below with reference to the drawings, but it goes without saying that the present invention is not limited to the drawings. FIG. 1 is a longitudinal sectional view of a crimping device used in the present invention. Regarding Figure 1, yarn Y
is guided to the heated fluid injection nozzle 1, and the supply port 2
The heated compressed fluid sent from the fluid injection holes 3, 3' is opened and plasticized, and then the blade plates 4 (4a, 4a,
4b...not shown). In the compression chamber 5, the yarn Y has already been pushed in and exists as a yarn mass, and the pushing start point is
Crinkage is imparted by the yarn colliding with the yarn mass at _P1 . Next, the yarn mass in the compression chamber 5 passes through a plurality of control holes drilled in the peripheral wall.
H ₁ , H ₂ .
The yarn is blown through a plurality of small holes 9 and flows in a direction opposite to the yarn traveling direction. As a result, a back pressure is applied to the entire yarn mass, further promoting the crimp of the yarn, and at the same time, the yarn is cooled in the retention adjustment chamber 7 and fixed once it is crimp.
Note that the hollow tubular body 6 has a small thread outlet 10 at its distal end so that the cooling fluid flows by itself in a direction opposite to the direction in which the thread travels. Therefore, the heated compressed fluid injected from the heated fluid injection nozzle 1 is
In the compression chamber 5, the cooling fluid is diffused and discharged sequentially from the radial direction of the compression chamber 5 toward the yarn traveling direction through the gaps between the vanes 4, while the cooling fluid is discharged through a plurality of controls bored in the circumferential wall of the hollow tubular body 6. It is discharged from the system through holes H ₁ , H ₂ . Therefore, when the yarn mass in the retention control chamber is pulled out upstream of the retention and unwinding point _P2 ,
As a result of the large discharge amount of the cooling fluid and the reduction of the back pressure caused by the cooling fluid, the yarn mass recovers to P ₂ . On the other hand, if the yarn mass is pulled out downstream of P ₂ , the amount of cooling fluid discharged will decrease and the back pressure will increase, so the yarn mass will be pushed down to P ₂ and the yarn retention and unwinding point will increase. Be constant. As a result of the retention and unwinding point _P2 being constant, the cooling conditions for the yarn are constant and the back pressure is also constant. Therefore, the pressure balance between the heating compressed fluid and the cooling fluid is adjusted, and the pushing start point _P1 becomes constant, and variations in the packing density, filling amount, residence time, etc. of the yarn mass in the compression chamber and the retention adjustment chamber also occur. There aren't many things. Therefore, by providing a retention adjustment chamber in addition to the compression chamber and discharging the cooling fluid separately from the retention adjustment chamber, a homogeneous crimped yarn can be obtained. In the present invention, by further blowing an emulsion into the yarn existing in the compression chamber and/or the retention adjustment chamber, the crimped yarn can be effectively cooled and crimped and fixed, and the amount of oil applied to the yarn can be increased. The aim is to improve twisting and tufting properties. The emulsion can be blown into any position on the yarn existing in the compression chamber and the retention adjustment chamber. Emulsion is a finishing oil containing smoothing agents, antistatic agents, coloring agents, etc., emulsified and dispersed in water using surfactants, etc., and is a general term for so-called spinning oils, drawing oils, etc. commonly used in the textile industry. However, the concentration of these emulsions is 5 to 20% by weight. The amount of emulsion applied to the crimped yarn is 2 to 5% by weight as an emulsion pick-up amount and 0.2 to 1.0 weight % as an oil pick-up amount based on the yarn. When the emulsion concentration is less than about 5% by weight, the oil pick-up amount (finishing oil applied amount) is about 0.2%.
If it exceeds about 20% by weight, it is not only disadvantageous in terms of weight, but also difficult to apply to yarn. Furthermore, "injecting an emulsion" refers to applying an emulsion to a yarn mass or an unwound yarn. In addition, the emulsion is
It is recommended to blow at an angle of ~120°, preferably approximately at a right angle. In the present invention, since the emulsion is blown into the yarn mass that is bent and accumulated in the yarn traveling direction or the unraveled yarn from a direction preferably approximately perpendicular to the yarn traveling direction, the yarn is left in a crimped state. It is possible to effectively and quickly cool the entire yarn mass or the inside of the single fibers, fix crimp, and apply an oil agent. Now, in FIG. 1, emulsion supply holes h ₁ , h ₂ . I am doing it. Thus, the yarn in the retention control chamber 7 is fed through the supply holes h ₁ , h ₂ . . .
The emulsion injected from the compressor is cooled and an oil agent is applied, and the remaining emulsion is discharged from the compression chamber 5 and/or the retention control chamber 7 to the outside of the system. The emulsion supply holes h ₁ , h ₂ ... are located at the first
It is not limited to the figure, and the compression chamber and/or the retention adjustment chamber may be located downstream of the heating fluid injection nozzle 1 and upstream of the cooling fluid injection hole 9. good. As described above, according to the present invention, in the crimping method using the fluid pushing method of the yarn, a retention adjustment chamber is separately provided downstream of the compression chamber, and the cooling fluid is caused to flow in the direction opposite to the traveling direction of the yarn. By discharging the fluid from the retention chamber, back pressure is uniformly applied in the compression chamber and retention adjustment chamber, which promotes curling of the yarn, and also keeps the pushing start point and retention unwinding point at a fixed position. Since it can be adjusted, it is possible to keep the filling degree, filling amount, etc. of the yarn constant in the compression chamber and the retention adjustment chamber. In addition, since the emulsion is directly blown into the yarn existing in the compression chamber and/or the retention chamber, the crimped yarn can be quickly cooled, crimped and fixed, and lubricant can be applied. Therefore, the resulting crimped yarn can be of much higher quality than the conventional fluid pressing method, and is particularly effective for high-speed processing. The present invention will be described in more detail below with reference to Examples. Example: Poly-ε capramide was melt-spun and stretched without winding to form a nylon multifilament of 1300 de/68 fil.Then, the crimping machine shown in Fig. 1 was used to perform hot fluid pressing under various conditions and the material was rolled. I took it. The conditions and results are shown in Table 1. In Table 1, the yarn temperature immediately after crimping is the value measured with a commercially available surface thermometer, and the moisture content is the value measured by dry heat (105
℃×3 hours), and the crimp ratio TC ₀ is the value determined as follows. That is, the sample length when a crimped yarn is taken to a certain length and a load of 0.1 g/de is applied is set as l ₀ , and this sample is subjected to relaxation heat treatment in boiling water for 20 minutes, air-dried, and then subjected to a load of 0.1 g/de. This is the value obtained from the following formula, assuming that the sample length when a load is applied l _{is 1} or the sample length when a load of 2 mg/de is applied l ₂ . TC ₀ =l ₁ −l ₂ /l ₀ ×100%

[Table] * Examples and others are comparative examples When cooling with emulsion is not performed, not only a low crimp rate is obtained, but also the twisting and tact properties are poor (Experiment No. 9).

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a crimping device used in the present invention. Y: Yarn, 5: Compression chamber, 7: Retention control chamber, h ₁ ,
_h2 ...: Emulsion supply hole.

Claims (1)

[Scope of Claims] 1. A yarn made of thermoplastic synthetic fibers is (a) forced into a compression chamber connected downstream of the nozzle by a heated compressed fluid injected from a heated fluid injection nozzle;
(B) The compression chamber is guided to a retention adjustment chamber connected downstream of the compression chamber, and cooling gas is blown into the chamber from the downstream side of the retention adjustment chamber to flow in the direction opposite to the direction in which the yarn travels. ) Discharge the heated compressed fluid from the compression chamber and the cooling fluid from the retention adjustment chamber separately, and (d) apply smoothing agents, antistatic agents, coloring agents, etc. to the threads existing in the compression chamber and/or retention adjustment chamber. A yarn crimping method characterized by blowing in an emulsion made by emulsifying and dispersing a finishing oil in water using a surfactant or the like. 2. The yarn crimping method according to claim 1, wherein the compression chamber is constituted by a plurality of radially provided blade plates. 3. The yarn crimping method according to claim 1, wherein the retention adjustment chamber is constituted by a hollow tubular body having a plurality of small holes bored in the peripheral wall. 4. The yarn crimping method according to claim 1, wherein the emulsion is blown into the yarn existing in the compression chamber and/or the retention adjustment chamber from a direction substantially perpendicular to the yarn traveling direction. 5. The method for crimping yarn according to any one of claims 1 to 4, wherein the emulsion concentration is 5 to 20% by weight. 6. Any one of claims 1 to 5, wherein the amount of emulsion applied to the yarn in the compression chamber and/or the retention adjustment chamber is 2 to 5% by weight, and the amount of oil applied is 0.2 to 1.0% by weight. The method for crimping a yarn according to item 1.