JP3222202B2 - Pressurized steam drawing equipment for yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized steam stretching apparatus for performing high-magnification stretching while suppressing the occurrence of fiber damage and fluff when a yarn is stretched by pressurized steam. is there.

[0002]

2. Description of the Related Art In the process of drawing a synthetic fiber tow or monofilament, it is known to heat and draw a yarn by pressurized steam. However, as a conventional steam injection port, one long or short slit is used. Alternatively, a number of circular small holes are arranged. Although a single long slit is convenient for determining the stretching point, the distribution of steam in the longitudinal direction of the slit tends to be non-uniform, which causes uneven stretching. On the other hand, in the case of a plurality of short slits or a large number of circular small holes, since the injection point is intermittent, stretching unevenness is likely to occur.

[0003] Further, pressurized steam supplied into the drawing chamber is sent directly from the steam supply pipe to the drawing chamber,
Or, once stored in the steam chamber by the steam supply pipe, is injected from the injection port and supplied to the stretching chamber,
In the conventional apparatus, the flow rate of the pressurized steam injected from each injection port becomes uneven due to the uneven pressure in the steam chamber, so that the temperature rise of the yarn becomes uneven, which causes uneven drawing.

[0004]

As described above, in the conventional yarn pressurized steam stretching apparatus, the flow rate of the pressurized steam supplied from the injection port into the drawing chamber depends on the shape of the injection port and the steam. Due to the unevenness of the pressure distribution in the chamber, it is difficult to uniformly apply steam to the yarn, and this often causes uneven drawing of the yarn.

On the other hand, in the threading operation, a suction operation is performed by applying air sucker, which is often used in the ordinary fiber manufacturing process, to the yarn outlet, but the suction efficiency is low and the yarn is multiplied. In this case, there are many problems such as operability becomes extremely complicated.

[0006] The present invention has been obtained as a result of investigations to solve such problems. The purpose of the present invention is to uniformly inject pressurized steam into a yarn running in a drawing chamber to prevent drawing unevenness. An object of the present invention is to provide a pressurized steam drawing apparatus capable of performing a high draw ratio while suppressing the occurrence of fiber damage and fluff and performing a threading operation easily.

[0007]

According to a first aspect of the present invention, there is provided a pressurized steam stretching apparatus for a yarn comprising a labyrinth nozzle portion before and after a pressurized steam processing chamber. The steam injection port of the pressurized steam processing chamber is continuously opened in a slit shape over the entire circumference of the yarn, and the width of the opening is 1/1 / the diameter of the processing chamber.
20 to 1/4, the opening angle of which is set to 15 ° or more and 90 ° or less with respect to the running direction of the yarn, wherein an air ejector is mounted at the yarn exit of the rear labyrinth nozzle portion. In a second configuration, in addition to the first configuration, a steam chamber is disposed around the processing chamber, and the steam chamber is provided with a primary steam chamber on a downstream side and an upstream side in a yarn flow direction by a flow straightening plate. And a secondary steam chamber, wherein the injection port is disposed in the primary steam chamber.

[0008]

In a pressurized steam drawing apparatus which heats and draws synthetic fibers by pressurized steam, the opening width of a steam jet can be appropriately selected according to the pressure of the steam to be jetted. That is, it is desirable that the steam as small as possible as compared with the circumference of the processing chamber is easily uniform in the steam injected from the circumferential direction of the yarn. If the opening width is too large, the amount of steam becomes uneven in the longitudinal direction of the yarn, which is considered to promote uneven steam in the circumferential direction and cause uneven drawing.

The opening angle θ of the injection port with respect to the running direction of the yarn is generally a right angle. However, when the draw ratio is high, the difference between the filling rate at the time of the threading operation and that at the time of drawing becomes large. If the amount of steam leaking from the rear labyrinth nozzle increases and it is feared that the running of the yarn is disturbed, the opening angle θ of the injection port should be 15 ° or more and a right angle or less, and the rear labyrinth nozzle and the front The disturbance of the yarn is suppressed as much as possible by balancing the amount of steam leaking from the labyrinth nozzle.

When a current plate is provided in the steam chamber, the pressurized steam is stored in the primary steam chamber by a steam supply pipe, and when passing through the current plate, the pressure, temperature, and pressure are substantially uniform in the secondary steam chamber due to the flow rectification effect. It has a velocity distribution.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a schematic configuration of a pressurized steam stretching apparatus according to the present invention.

The pressurized steam stretching apparatus includes a front labyrinth nozzle section 2 and a rear labyrinth nozzle section 2 ′ for suppressing steam leakage before and after the pressurized steam processing chamber 1.
Is provided.

The pressurized steam processing chamber 1 comprises a cylindrical chamber, and comprises a steam injection port 3, a flow straightening plate 4, a primary steam chamber 5, a secondary steam chamber 6, and a steam supply pipe 7. The primary steam chamber 5 and the secondary steam chamber 6 are separated by a current plate 4 and the steam supply pipe 7 is connected to the primary steam chamber 6 on the downstream side of the yarn. The steam injection port 3 is arranged on the same circumference on the inner peripheral surface of the secondary steam chamber 6, and is continuously open to the entire circumference of the yarn a. The yarn a enters from a front labyrinth nozzle portion 2 provided on the upstream side of the yarn with the pressure steam processing chamber 1 interposed therebetween, passes through a stretching chamber 8 corresponding to the center of the pressure steam processing chamber 1, and The process moves to the next step via the downstream labyrinth nozzle 2 ′ on the downstream side.

The pressurized steam b flows into the primary steam chamber 5 by the steam supply pipe 7, passes through the current plate 4 and is stored in the secondary steam chamber 6, and then flows from the steam injection port 3 into the stretching chamber 8. Inject and heat the yarn a.

As a result of repeated investigations for suppressing the temperature unevenness of the yarn and preventing the damage of the yarn and the generation of fluff, FIGS.
When the opening width of the injection port 3 is h, the diameter of the drawing chamber 8 is D, and the opening angle of the steam injection port 3 with respect to the running direction of the yarn a is θ, as shown in FIG. Regarding the injection port 3, it was found that it is effective that 1/20 <h / D <1/4 15 ° ≦ θ ≦ 90 °. Further, the pressurized steam b introduced for jetting from the steam jet port 3 into the stretching chamber 8 flows into the primary steam chamber 5 through the steam supply pipe 7, and the pressurized steam b here has a particularly high speed distribution. However, it is not preferable to directly jet the yarn a as it is without the uniformity. Therefore, after the pressurized steam introduced into the primary steam chamber 5 is passed through the straightening plate 4 to make the steam velocity distribution uniform, the steam is injected from the steam injection port 3 provided in the secondary steam chamber 6 to the yarn a. This eliminates uneven steam, prevents damage to the yarn and fuzz, and enables high-magnification steam drawing.

The opening width h of the steam injection port 3 can be appropriately selected depending on the pressure of the steam to be injected. The opening width h is the length of the slit, that is, the circumferential length of the stretching chamber 8 (=
(π × D) is desirable because the steam injected from the circumferential direction of the yarn a tends to be uniform. If the opening width h is too large, the steam becomes non-uniform in the longitudinal direction of the yarn a, which is considered to promote uneven steam in the circumferential direction and cause uneven drawing. In addition, heat treatment is performed uniformly,
In addition, when a large area for performing the processing is required, the steam injection ports can be arranged in a plurality of stages.

The opening angle θ of the injection port 3 with respect to the running direction of the yarn a is generally a right angle as shown in FIG. 2, but when the drawing ratio is high, the filling rate during the threading operation and the filling rate during the drawing operation are different from each other. In particular, when there is a concern that the amount of steam leaking from the rear labyrinth nozzle portion 2 ′ may increase and disturb the running of the yarn a, the opening angle θ of the injection port 3 may be increased as shown in FIG. The right labyrinth nozzle part 2 '
It is essential that the amount of steam leaking from the front labyrinth nozzle portion 2 be properly balanced to suppress the disturbance of the yarn a as much as possible.

Here, the filling ratio = 4 (K / (9 × 10 ⁵ × ρ)) / πD ² . K: yarn fineness [denier] ρ: yarn density [g / cm ³ ] D: diameter of drawing chamber [cm]

According to the present invention, the suction efficiency is increased by installing the air ejector 9, and the thread can be easily threaded only by temporarily supplying the compressed air c to the air ejector 9, so that the yarn can be easily removed. This is particularly effective in the case of multiple weights.

[0020]

As is apparent from the above description, according to the apparatus of the present invention, it is possible to prevent the damage and the fluff of the yarn, and to perform the high-pressure pressurized steam stretching process, and at the same time, to the case of a multiple weight. The threading operation can be performed easily.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a pressurized steam processing apparatus of the present invention.

FIG. 2 is a side sectional view showing an example of a steam injection port of the present invention.

FIG. 3 is a side sectional view showing another example of the steam injection port of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressurized steam processing chamber 2, 2 'front and rear labyrinth nozzle part 3 Steam injection port 4 Rectifier plate 5 Primary steam chamber 6 Secondary steam chamber 7 Steam supply pipe 8 Stretching chamber 9 Air executor a Yarn D Stretching chamber Diameter h Opening width (of steam injection port) θ Opening angle

Continued on the front page (72) Inventor Hiroaki Yoneyama 20-1 Miyukicho, Otake City, Hiroshima Prefecture Inside Mitsubishi Rayon Co., Ltd. (72) Inventor Toshihiro Makishima 20-1 Miyukicho, Otake City, Hiroshima Prefecture Mitsubishi Rayon Co., Ltd. (56) References JP-A-48-1447 (JP, A) JP-A-51-32844 (JP, A) JP-A-63-39190 (JP, U) JP-B-46-20848 (JP, A) , B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) D02J 1/22 D06B 23/20-23/22

Claims (2)

(57) [Claims] 1. A yarn pressurizing steam stretching apparatus comprising a labyrinth nozzle portion before and after a pressurized steam processing chamber, wherein the steam injection port of the pressurized steam processing chamber has a slit shape and the entire circumference of the yarn. The width of the opening is set to 1/20 to 1/4 of the diameter of the processing chamber, and the opening angle is set to 15 ° or more and 90 ° or less with respect to the running direction of the yarn. An air ejector is attached to a yarn exit of the rear labyrinth nozzle portion, and the yarn is subjected to a pressurized steam stretching apparatus. 2. A steam chamber is disposed around the processing chamber, and the steam chamber is divided into a primary steam chamber and a secondary steam chamber by a rectifying plate on a downstream side and an upstream side in a yarn traveling direction. The pressurized steam stretching apparatus according to claim 1, wherein an injection port is arranged in the secondary steam chamber.