JPS599649B2 - Method for manufacturing crimped yarn - 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-like cut carpets.

In recent years, demand for tufted carpets has increased rapidly due to the high productivity of tufted carpets, and they are now being used for general carpets.

The fashionability of this general carpet (for home use) is considered important, and recently, velor cutlet 1 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 heel is poor, the cut pile will become flattened after being used for a short period of time, so the pile yarn is required to have robustness, that is, crimp robustness.

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 characteristics 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 mostly satisfies the characteristics required for velor cut carpet,
Since the steam treatment is performed in a separate process, it is very disadvantageous in terms of equipment productivity and cost.

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, so the so-called SDT (Spin-Draw) process, in which the processes of spinning, drawing, and crimping are linked
-Texturing) process to produce crimped yarn (BC
F) is currently being manufactured.

In such an SDT process, an indentation crimp method using compressed and heated fluid, which is excellent in high-speed processability, is employed.

An example of such a fluid pressing crimping device is disclosed in Japanese Patent Application Laid-open No. 53
Preferably, those described in Japanese Patent No.-45420 and the like are preferred.

However, the crimped yarn obtained by such an SDT process is not suitable as a 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, and the quality of the cut carpet is significantly deteriorated.

(For example, the pile may become flattened or the velor feel may be lost.) The present inventors have developed a crimping process suitable for pile yarn for velor-like cut carpets in a push-crimping process using heated compressed fluid. The present invention was arrived at as a result of extensive research in order to manufacture yarn.

That is, in the present invention (the ζ yarn is spouted into the stuffing chamber together with the heated fluid, the yarn is compressed and deposited in the stuffing chamber, and the yarn is crimped), and the retention adjustment device is connected to the downstream side of the stuffing chamber. When manufacturing a crimped yarn by unwinding and taking the compressed piled yarn in the 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 spouted into the stuffing chamber together with the yarn is heated from the same side of the stuffing chamber. By discharging the heated fluid to the outside of the system, and discharging the heated fluid supplied into the retention control chamber from the same side of the retention control chamber to the outside of the system, a low-crimp crimping process suitable for pile yarn for velor-like cut carpets is achieved. This allows yarn to be manufactured 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 a fluid-pressing crimping device used in the present invention.

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 blade plate 4 are fixed to flanges 3a and 3b.

In this stuffing chamber 5, the heated fluid is separated from the yarn and discharged to the outside of the system through radial slits formed between the vane plates 40, while the yarn collides with the already accumulated yarn mass and becomes crimped. is applied, 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 inside the retention adjustment chamber in the opposite direction to the traveling direction of the yarn (i.e., toward the upstream side).
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 from a large number of heated fluid discharge holes 7 provided on the circumferential surface of the retention control chamber 60.

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 be ejected from the stuffing chamber 5 against the movement of the accumulated 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 a good heat treatment effect. 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, the forced piled The high degree of crimp and residual strain that was sometimes imparted is 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 to a desired value relatively easily.

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.

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, the crimped yarn (B
CF) 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), crimp fastness ('rc5) Crimp ratio TCo and crimp fastness TC5 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.
After processing for 0 minutes and drying, 0. If the length when a load of IP/de is applied is 1, then the length when a load of 2m&/de is applied is 12, then l1-12 T Co-X 100 (%) This is the value obtained from the formula l1.

In addition, when TC5 is treated in boiling water for 20 minutes, TCo
In contrast, TC5 does not apply any load to the yarn being processed.
The tests were carried out with a load of 5 .mu./de applied.

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

The speed of the stretching rollers 1 3 and 1 3' in FIG. 1 is Rv3, and the speed of the first take-up roller 15 is Rv5.
It is defined as .

Examples 1 to 4, Comparative Example 1 Poly ε
130 Stretched without winding up one cabroamide
A 0 de/68 fil nylon multifilament yarn was crimped under the conditions shown in Table 1.

Table 1 shows the processing conditions and the properties of the crimped yarn obtained.

By blowing heated steam into the retention control chamber and performing heat treatment, it is possible to satisfy the desired crimp ratio (TC.)≦9.5 (%) as a pile yarn for velor-like cut carpets.

[Brief explanation of drawings]

Figure 1 shows → of the fluid pressing crimping device used in the present invention.
1 is a simplified vertical cross-sectional view showing a heated fluid injection nozzle, 5 is a stuffing chamber, 6 is a retention adjustment chamber, and 8 a
, 8b Heating fluid blowing hole for yarn heat treatment.

Claims (1)

[Scope of Claims] 1. The yarn is ejected together with a heated fluid into the stuffing chamber, compressed and deposited in the stuffing chamber to give the yarn a crimp, and a retention control device connected to the downstream side of the stuffing chamber. When producing a crimped yarn by unwinding and taking the compressed piled yarn in the chamber, a heating fluid is supplied into the retention adjustment chamber, and at least a portion of the heating fluid is directed in the direction of yarn travel. Move it in the opposite direction,
The yarn that is being unwound or the unwound yarn 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. A method for producing crimped yarn, characterized in that 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. 2. The manufacturing method according to claim 1, wherein steam is used as the heating fluid supplied into the retention control chamber.