JP2646302B2 - Fluid push-in nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a fluid pushing nozzle used in a crimping apparatus for thermoplastic synthetic fiber yarn.

[0002]

2. Description of the Related Art In recent years, at the time of crimping of a yarn, the yarn is pushed into a compression chamber by a heating fluid using a heating fluid injection nozzle, because the yarn can be processed at high speed and the apparatus can be made compact. , A so-called fluid indentation processing method is being studied. That is, according to the fluid indentation method, the yarn can be efficiently crimped by plasticizing the yarn by the heating fluid in the heating fluid injection nozzle and shaping when the yarn is pushed into the compression chamber by the fluid. Therefore, high-speed processing becomes possible, and since the crimping apparatus is also connected to the heated fluid injection nozzle, the equipment becomes extremely compact.

However, in such a fluid pushing method, the starting point of pushing the yarn in the compression chamber (the distance from the nozzle to the thread mass already pushed into the compression chamber),
Since the quality (crimp rate, dyeing rate, etc.) of the obtained crimped yarn changes depending on the packing density, the stay unwinding point or the cooling state of the yarn, it is difficult to obtain a stable and uniform product. Based on these viewpoints, the cooling fluid (air) is blown into the compression chamber in such a way as to go back in the direction in which the yarn is pulled out, so that the yarn is crimped and fixed, and the yarn is wound in the compression chamber by the back pressure of the cooling medium. A method (and apparatus) for promoting shrinkage has been proposed (JP-A-47-25450, 49-71).
No. 242, No. 50-123962, Japanese Patent Publication No. 5
0-33176).

However, in each of these methods, since both the heating fluid and the cooling fluid are discharged from the compression chamber, it is difficult to adjust the pressure balance between the two fluids in the compression chamber. In addition, the starting point of the yarn pushing in the chamber, the packing density, the retention unwinding point, and the like tend to fluctuate. In order to prevent these phenomena, a means for adjusting the pressure of both fluids in the compression chamber by providing a pressure adjusting valve at the fluid discharge port of the compression chamber has also been proposed (Japanese Patent Application Laid-Open No. Sho 47/1987).
-25450), and the apparatus is complicated and poses a practical problem. Regarding these problems, a plurality of pores for discharging the cooling fluid in the radial direction are provided in a multistage manner in the longitudinal direction between the compression chamber having the slit-shaped heating fluid discharge port in the longitudinal direction and the cooling fluid supply device. It has been found that when the cooling fluid is discharged from the chamber, a stable and good crimped yarn can be obtained, and the heating fluid ejection nozzle and the heating fluid discharge port are provided. A crimping device for a yarn has been proposed which sequentially combines a compression chamber having a cooling fluid discharge port, a stagnation adjusting chamber having a cooling fluid outlet, and a cooling fluid supply device for supplying a cooling fluid in a direction opposite to a direction in which a heating fluid is ejected. (See Japanese Patent Publication No. 56-33739). Further, a nozzle in which these fluid pushing nozzles are half-split to facilitate the yarn hooking property is proposed in Japanese Patent Publication No. 58-42292.

[0005]

However, when the thermoplastic synthetic fiber yarn is crimped using these conventional fluid injection nozzles, the stagnation start point is hunted and the stagnation of the stagnation is smooth. In some cases, the stability of the processing was poor, resulting in a decrease in yield. In particular, when the cross section is a hollow fiber or the denier of a single yarn is small, this phenomenon becomes remarkable and even processing may not be possible. The present invention improves such a problem, and provides a fluid push-in nozzle excellent in operability by smoothing the transfer of the stagnation mass in the compression chamber of both fine denier yarn and hollow fiber, reducing hunting at the stagnation start point. The purpose is to:

[0006]

According to the present invention, there is provided a compression chamber formed by a heated fluid injection nozzle, a space provided downstream of the nozzle, and surrounded by a plurality of radially arranged vanes. A fluid push-in nozzle that is connected to the downstream of the chamber and is configured sequentially from a stagnation adjustment chamber that applies a back pressure to the yarn lump and performs cooling by flowing a cooling fluid in a direction opposite to the injection direction of the heating fluid. The fluid push-in nozzle according to any one of claims 1 to 3, wherein the inclination angle of the blade plate is adjusted to the following three stages. The spread angle of the upstream part of the slat is 1.1 degrees or more The spread angle of the middle part of the slat is less than 1.0 degrees The spread angle of the downstream part of the slat is 1.1 degrees or more

Hereinafter, the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, the fluid pushing nozzle N of the present invention is provided on the heated fluid jet nozzle 10, a plurality of blade plates 21 a, 21 provided on the downstream side and arranged radially.
b,... are connected to the compression chamber 20 defined by a space surrounded by 21 l and downstream of the compression chamber 20, and allow the cooling fluid to flow in the direction opposite to the jetting direction of the heating fluid. The stagnation control chamber 30 is configured to sequentially apply a back pressure to the ingot and cool the yarn.

According to the fluid pushing nozzle N, the yarn Y is heated and plasticized by the fluid injection nozzle 10 by the heated compressed fluid HL (steam, heated air, etc.) supplied to the nozzle. The fiber is spread, accelerated, and sent to a compression chamber 20 provided downstream of the nozzle. The compression chamber 20
Forms a cylindrical space surrounded by a plurality of blades 21 (21a to 21l) provided radially as shown in FIG. The yarn Y is pushed forward in the compression chamber 20 and collides with the accumulated yarn mass, buckles and is crimped. The yarn lump forms a stagnation start point P1 by the balance of the back pressure of the blade plate 21, the heating fluid HL, and the cooling fluid CL supplied from the stagnation chamber 30. The stagnation mass is the blade 21
, And the heating fluid HL is discharged out of the gap between the blades 21. The staying mass subsequently moves to the stay adjustment chamber 30. The stagnation chamber 30 is constituted by a hollow tubular body 31 in which a plurality of holes (H1 to H8) are formed in the peripheral wall along the longitudinal direction of the adjustment chamber 30 so that the back pressure can be controlled. . The cooling fluid CL is
It is blown from the lower part of the stagnation chamber 30 through a plurality of small holes H ′ through the cooling fluid reservoir 32 and circulated in the direction opposite to the yarn traveling direction. As a result, the entire yarn lump is pushed upward by the back pressure, and the stay unwinding point P2 is formed.

The stagnant mass moved from the upstream side of the yarn to the stagnant adjusting chamber 30 is cooled in the chamber 30, the crimp is fixed, and is taken out from the yarn take-out hole 40. Yarn take-out hole 4
In the case of 0, the hole diameter is narrowed so that the cooling fluid CL itself flows in the direction opposite to the yarn traveling direction. Thus, in the present invention, the heated compressed fluid HL injected from the heated fluid injection nozzle 10 is used.
In the compression chamber 20, the gap between the blades 21 is
The cooling fluid CL is sequentially diffused and discharged from the radial direction of the yarn in the yarn traveling direction, while being supplied to the stagnation adjusting chamber 30.
It is discharged out of the system through a plurality of control holes H1 to H8 formed in the peripheral wall of the hollow tubular body 31.

Therefore, when the yarn lump in the stagnation adjusting chamber 30 is pulled out upstream from the stagnation unwinding point P2, the holes H8 to H1 are not blocked by the yarn lump, so that the cooling fluid from the hole is not removed. As the amount of discharge increases and the back pressure due to the cooling fluid decreases, the yarn lump drops and recovers to P2. On the other hand, when the yarn lump is withdrawn downstream of P2, the holes are blocked, conversely, the discharge amount of the cooling fluid decreases, and the back pressure increases. Therefore, the yarn lump is pushed up to P2, Self-control is performed so that the stay unwinding point P2 of the yarn is always constant. As a result of such a self-control action, the position of the stay unwinding point P2 becomes constant, so that the back pressure and the cooling condition of the yarn become constant. Therefore, the pressure balance between the heated compressed fluid and the cooled fluid is adjusted, and the position of the stagnation start point P1 automatically becomes constant, and the filling density, filling amount, and stagnation of the yarn mass in the compression chamber 20 and the stagnation adjusting chamber 30 are adjusted. Variations in time and the like are eliminated, and uniform crimped yarn can be manufactured.

However, even in the fluid push-in nozzle N having such excellent performance, it is necessary to form the stagnation mass in the compression chamber 20 and to smoothly transport the stagnation mass to the next stagnation adjusting chamber 30. Has a very important function, and depending on the type of the yarn Y, there may be cases where the yarn Y cannot be processed at all. That is, especially when the cross-sectional shape is a round cross-section, in the case of a hollow cross-section, when the single yarn denier is as thin as 8 deniers or less, or when the total denier is as thin as 600 deniers or less, stable transfer of the retained mass is difficult. is there. In order to improve this point, in the present invention, the structure of the conventional vane plate having a simple inclination θ (θ = 1 to 2 degrees) as shown in FIG. Adjusted.

The spread angle of the upstream portion of the blade plate is set to 1.1 degrees or more. In this structure, the inclination angle θ of the blade plate 21 between the heating fluid injection nozzle 10 and the retention start point (push start point) P1 is set as wide as possible so that the heating fluid can easily escape from the gap between the blade plates. That's why. When the spread angle is less than 1.1 degrees, the heating fluid HL does not easily escape from the gap between the blades. The spread angle is preferably 1.2-5.
0 degrees.

The divergence angle in the middle part of the blade plate 21, that is, near the stagnation start point P1, is less than 1.0 degree. This is because in the vicinity of the stagnation start point P1, the stagnation lump is difficult to move, and the stagnation start point P1 is fixed, so that hunting of the stagnation lump start point P1 is less likely to occur. The spread angle of the midstream portion of the blade is desirably about 0.5 degrees. Retention start point P
1 starts at about 10 mm to 30 mm from the uppermost end of the slat 21, and therefore, it is necessary that the angle of about 10 to 30 mm downstream from this vicinity be less than 1.0 degree.

The spread angle of the downstream portion of the blade plate 21 is set as follows.
At least once. In order to smoothly transfer the stagnation mass stably obtained in the middle part of the blade to the stagnation adjustment chamber 30,
This is because it is better to increase the inclination angle again. From this viewpoint, a preferable inclination angle of the downstream portion is 1.2 to 2.0 degrees.

FIG. 3 shows an example of the blade 21 used in the fluid pushing nozzle N of the present invention. The slat 2 shown in FIG.
1 is that the upstream part 10 mm of the blade plate 21 has a tilt angle of 3.0 degrees, the middle part 20 mm of the blade plate 21 has a tilt angle of 0.5 degrees,
An example in which the downstream portion 70 mm of the blade plate 4 has an inclination angle of 1.25 degrees. Here, the inner diameter of the compression chamber 20 at the lowermost end of the blade plate 21 is preferably smaller than the inner diameter of the stagnation adjustment chamber 30 on the downstream side. The angle may be further adjusted so as to form a more inner ring. For example, it is also possible to adjust a portion 20 to 30 mm below the downstream portion 70 mm of the blade plate 21 to 0 to 1.1 degrees.

[0016]

The present invention will now be described more specifically with reference to examples. Examples 1 and 2 and Comparative Examples 1 and 2 Following the spinning-drawing of a yarn Y having a denier of 420 and a diameter of 136 made of nylon 6 and having a round cross section, a blade 21 having a structure shown in Table 1 was provided. The crimping process was performed using a heated fluid pushing nozzle having a length of 20 and 100 mm as shown in FIG. The inclination angle of the blade plate 21 was divided into an upstream part, a middle part, and a downstream part, and the retention stability was evaluated. The evaluation items were the size (stability) of the hunting of the stagnation start point, the position of the stagnation unwound point and its stability, and the degree of ease of thread breakage (the degree to which the stagnation start point suddenly rises and breaks the thread). There are three items. The details of the evaluation are as follows. Hunting small; hunting within ± 5 mm Fairly good; hunting within ± 5 ± 10 mm Large; Degree of hunting breakage of ± 10 mm or more ○ (good); Number of times of breakage per day is 2 times or less / 4 weight × ( Poor); The number of times of thread breakage per day is 3 to 10 times / 4 weight XX (thread cannot be threaded); When thread is threaded, thread breakage occurs within several minutes. Table 1 shows the evaluation results.

[0017]

[Table 1]

In the first and second embodiments of the present invention using the fluid pushing nozzle using the blades whose angles are changed in three stages, extremely excellent staying stability is obtained, and therefore, the yarn breakage rate during processing is reduced. Dramatic decrease and operability has been greatly improved. On the other hand, in the case of Comparative Example 1 in which the angle of the conventional blade plate is constant and as small as 1.0 degree, the hunting at the stagnation start point is small, but it is difficult to transfer the stagnation mass. The length of the stagnation mass was raised to the top, and the length of the stagnation mass became short. Further, in the case of Comparative Example 2 in which the inclination angle of the blade plate was increased to 1.5 degrees, the stagnant starting point was largely hunted, and the yarn could not even be threaded, probably because the retained mass was easily transferred. As described above, a satisfactory stagnation stability cannot be obtained with the conventional slat structure in which the action mechanism of the formation and movement of the stagnation mass on the slats is not considered.

[0019]

The use of the fluid pushing nozzle of the present invention stabilizes the retention start point even for brands which have been difficult in the past, and makes the transition of the retained mass extremely smooth. In addition, even in the conventional brand, the hunting at the staying start point is reduced, and the stability of the transfer of the staying lump is particularly improved. Furthermore, in particular, when the retention start point rises to the upstream side for some reason, the retention start point immediately rises to the fluid ejection nozzle side in the conventional nozzle and the thread breaks, but in the fluid pushing nozzle of the present invention, Even if the stagnation start point rises to the upstream side, the heating fluid can diffuse outside due to the large gap at the upper part of the slat, and the stagnation start point is unlikely to rise to the upstream part due to the large inclination angle of the upstream part,
There is also an advantage that it is difficult to cause thread breakage. As a result, the number of thread breaks is reduced, and operability can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a fluid pushing nozzle of the present invention.

FIG. 2 is a vertical sectional view taken along line XX ′ of FIG. 1;

FIG. 3 is a schematic view showing an example of a blade plate of the present invention.

FIG. 4 is a schematic view showing an example of a conventional blade plate.

[Explanation of symbols]

 N Heated fluid injection nozzle 21 Blade 20 Compression chamber 30 Retention adjustment chamber P1 Retention start point P2 Retention unwinding point

Claims (1)

(57) [Claims] 1. A compression chamber formed by a heated fluid injection nozzle, a space provided by a plurality of radially arranged vanes, and a compression chamber provided downstream of the nozzle and a downstream side of the compression chamber. In addition, in the fluid push-in nozzle, which is configured in order from a stagnation adjusting chamber that applies a back pressure to the yarn mass and cools the yarn by flowing the cooling fluid in a direction opposite to the injection direction of the heating fluid, A fluid pushing nozzle characterized in that the inclination angle of the plate is adjusted to the following three stages. The spread angle of the upstream part of the slat is 1.1 degrees or more The spread angle of the middle part of the slat is less than 1.0 degrees The spread angle of the downstream part of the slat is 1.1 degrees or more