JPS5940460Y2 - Fluid jet nozzle for yarn opening heat treatment - Google Patents

Description

[Detailed description of the invention] The present invention is a fluid jet nozzle, more specifically, a fluid for opening and heat treating yarn, which separates and opens yarn, especially multifilament yarn, into individual filaments and heat-treats them with a heated fluid. Regarding improvements to jet nozzles.

Filament heating fluid processing can be roughly divided into those that use turbulent flow and those that use laminar flow.

A true example of the former is to form a loop yarn in a fluid jet nozzle (hereinafter referred to as "jet nozzle"),
A method of heat fixing the loop using a fluid as a heat source, cooling it and then tensioning it to eliminate the loop to form a crimped yarn (see Japanese Patent Publication No. 45-24699), or a method in which the filaments are individually heated in a jet nozzle using a heated fluid. Among them, there is a method of imparting crimps while whipping (see Japanese Patent Publication No. 13226/1983).

As an example of the latter, filament threads are opened in a jet nozzle and run in a substantially straight line, and the threads are plasticized, and then the filament threads are set close to the exit end of the jet nozzle.
A method of buckling the protruding wall to give crimps, or a method of buckling the filament by opening the filament in a jet nozzle, applying a Relanx heat treatment or preheating it, and then cooling it and then releasing it from the jet nozzle. Examples include methods for taking out (see Japanese Patent Publication No. 51-34018, Japanese Patent Publication No. 50-33176, Japanese Patent Application Laid-open No. 49-41659, etc.).

Since both methods use heated fluid sound, it is important to uniformly heat treat the filaments, but in the latter case, the ultimate crimping operation is performed after opening and preheating. It is said that the preliminary treatment, that is, the opening heat treatment, has an extremely large influence on the crimped yarn.

For example, when a filament is partially opened, heat treatment spots naturally occur between the opened filament and the filament in the unsplit portion, which causes dye spots in the final product.

Furthermore, such heat treatment spots cause a difference in preheating plasticization between one filament, which appears as a difference in shaping force after the filament, and causes crimp spots in the yarn.

Various jet nozzles have been proposed in order to eliminate this after-spreading process, but most of these jet nozzles aim to propel the yarn in a straight line within the jet nozzle, while others promote turbulent flow. The aim is to maintain the laminar flow while preventing the occurrence of such problems, and specifically, the dimensions of each part of the jet nozzle, the fluid injection angle, etc. are specified.

The purpose of the present invention is to eliminate the need for strict machining accuracy of the jet nozzle, as described above, and to improve the opening properties of the yarn with a simpler structure. It has been found that this can be achieved by providing an expansion chamber of a specific shape in the middle of the tube, and by making pores in the corners of the expansion chamber and outside the thread path to allow the fluid to escape to the outside.

The jet nozzle of the present invention will be explained below with reference to the accompanying drawings. In FIG. 1, 1 is the fluid jet nozzle body, 2 is the yarn inflow path, 3 is the throat, and 4 is a tapered part in the yarn traveling direction. expansion chamber; 5 is a processing path that widens toward the end;
, 6' are fluid ejection passages that open at different angles to the throat 3;
γ is a small hole bored through the main body at a corner of the expansion chamber and outside the thread path, 8 and 8' are light supply tubes, and 9 is a bolt groove.

FIG. 2 shows the main body 10 and the cover 10, 11 is a bolt groove, and 12 is a bolt.

This cover 10 is integrated into the main body 1 by screwing the bolts 12 into the bolt grooves 9 of the main body and is used for yarn processing.

In such a jet nozzle, the yarn is first supplied from the yarn introduction path 2 and reaches the throat 3, where it is connected to the fluid ejection paths 6, 6.
It is propelled into the expansion chamber 4 by the fluid ejected from '.

As shown in the figure, the cross-sectional area of the chamber (indicated by W3) in contact with the opening of the throat 3 (indicated by W2) is dog-shaped, and the shape is gradually constricted (or may be diamond-shaped). (・.

It has a tapered shape and is connected to a processing path 5 which is widened at the end.

A small hole γ passing through the jet nozzle body is provided at the corner of the expansion chamber 4 (outside the thread path), so a part of the ejected fluid flows out through the hole, resulting in a lateral force direction. The diffusion force acts to promote the opening of the yarn.

This state is shown in FIG. 4, and the yarn 13 is drawn into the processing path 5 in a more separated and opened state.

Figure 3 shows the condition of the yarn when no single hole was provided, and the opening condition was not improved compared to the present invention.

Here, the effects of the above configuration will be sequentially explained.

In FIG. 1 or 4, it is necessary that the fluid jetting passages 6 and 6' face each other in order to provide a propulsion force to the yarn (suction from the entrance of the yarn introduction passage 2 and blowout from the processing passage 5). ff: This is due to the fact that the fiber is given and the opening of the yarn is promoted.

First, if the fluid jetting passages 6 and 6' are not provided opposite to each other (and the fluid jetted from both has different effects on the yarn, the yarn may become entangled or falsely twisted). The target fiber opening effect cannot be obtained due to convergence.

Next, there is a tapered expansion chamber, which is used to spread the fibers wider than the thread ejected from the bulb part 3 due to the action and effect of the σ-shaped chamber, and in this case, the outlet W2 of the throat part 3 The high-velocity fluid (air) squeezed by the casing rapidly expands and expands to the width W3 of the expansion chamber 4, and the yarn is also opened together with the fluid.

At this time, since the fluid flows out of the nozzle through the pores 7 provided at the corners of the expansion chamber 4, the expansion effect becomes even stronger.

Then, the ejection part of this expansion chamber 4 is tapered to a width 1 of W4.
The reason for this is that the yarn needs to be ejected from the outlet of the expansion chamber 4 at a certain speed and at an appropriate fiber density.

Further, due to this "tapered" state, the yarn is also smoothly ejected from the expansion chamber 4.

On the other hand, if the wall of the expansion chamber 4 does not have a taper (・
This is not a good thing because the threads may get caught or twitch.

Further, when the fluid flows through the end-spreading treatment path 5, the resistor 4 is necessary to prevent turbulence from occurring from this flow path, that is, to eject the yarn in an open state.

Finally, a thread introduction path 2, a throat section 3, a tapered expansion chamber 4,
The purpose of arranging the processing passages 5 which are flared at the end on the same axis is to prevent the fluid from entangling or false twisting the threads as it passes through these parts.If these members are bent, turbulent flow or Swirling flow occurs, which makes it difficult to obtain a favorable opening effect (・.

The jet nozzle shown in FIG.
Although the cross sections of each part are all rectangular, this is advantageous from the viewpoint of preventing swirling flow as much as possible.

This swirling flow causes the entire yarn to balloon and inhibits the opening of individual filaments.

On the other hand, the pores γ that promote the opening of the yarn do not come into direct contact with the filament, as shown in Figure 4, and moreover, a diffusion force occurs outside the main body and in a direction substantially perpendicular to the traveling direction of the yarn. It is appropriate to provide it at a certain location.

Although the shape of the pores is usually circular, considering the purpose of the present invention.

It is not particularly limited to a circular shape.

Also, regarding the area, in the case of a circular pore, the diameter is 0.
．． A suitable diameter is about 2 to 3 Omm, and it is sufficient to provide about 1 to 5 of these pores at each corner of the expansion chamber.

Furthermore, it is an advantageous means to increase the angle of the pores 1 not only in the direction perpendicular to the plane of the paper as shown in the figure, but also to increase the angle so that the fluid can more easily flow out as shown in FIG.

Of course, the pores may be provided not only in one wall surface of the expansion chamber, but also in the cover 10 and further in the side wall S1 of the expansion chamber.

However, since the thickness d3 of the side wall itself is about the same as the height h5, it is generally preferable to drill the hole in the wide wall of the wall formed by the expansion chamber, as shown in FIG.

In the jet nozzle described above, only the thread introduction hole 2 consists of a tapered semi-cylindrical part 2p and a thread path 2e having the same diameter (semi-cylindrical part) as the minimum diameter (tip) of the tapered part. It is an annular passage, and all other parts have a rectangular cross section, but this is just a point of the present invention, and the same can be said of a jet nozzle that is entirely annular but has a vertical cross section as shown in Figure 4. Applies to.

The point is that immediately after the exit of the throat section 3, while the fluid is diffusing in the direction of the lateral force,
It is only necessary that there be pores communicating with the outside air in the expansion chamber which is narrowed along the thread path.

The jet nozzle according to the present invention can be used as a single item for relaxing heat treatment of ordinary yarns and relaxing heat treatment of potentially crimped yarns to create crimp. ), it is also effectively used when a crimped yarn is obtained by impact shaping a yarn in a plasticized state.

Furthermore, the jet nozzle of the present invention maximizes its unique sound effects by opening and preheating the yarn within the same jet nozzle, and then applying crimping while bending and retaining the yarn, such as by pressing and crimping. This is a case where it is adopted in a fluid jet nozzle that takes out after cooling.

In this case, at the tip of the jet nozzle of the present invention, the 11 crimped portion and the cooling portion are arranged as an integral piece of metal or connected.

As described above, the present invention has a simple structure in which a pore penetrating to the outside air is provided in the expansion chamber provided following the throat.
Opening 1 ton of filament yarn! ! E can be improved, thereby eliminating heat treatment repeating sound between the filaments, and making it possible to impart stronger crimp to each filament.

Example 1 Polyester filament yarn 150de/30fil (
14%) is processed through the jet nozzle shown in FIG.

At this time, the supply speed to the jet nozzle was 2000 m/
mix, take-out speed from jet nozzle is 1700m
/m and heated to 230°C; 3. v/crItG
compressed air was used.

The main specifications of the jet nozzle are as follows.

(1) Yarn introduction path 2 (a) Part of the taper (2p) Taper angle (α) 20° length t,) 15 mm Maximum semicircular diameter (dl) 7 mm (b) Semi-cylindrical portion 2e length 22) 5 Bullfighting circle diameter (d2) 1.3 mm (2) Throat 1 part 3 Length t3 ) 5 Width (W, ) 8 mm (W2) 2 degrees 5 mm (3) Fluid ejection path 6. ff angle) 60° depth d3) 1.6g In addition, depth l.

6111 is common to the throat, expansion chamber, and processing path.

(4) Expansion chamber 4 width (W3) 15
mg angle (θ) 4f length, /! , 4) 6,5 Tomo (5)
Pore 7 Diameter 0.8 Number of holes 3 in each corner (6) Yarn processing path 5 Minimum width (W4) 3.0m
i + length, /,,) 23.5 angle ω
4. f Next, the yarn after heat treatment is dyed with dye (Xylene Fast
The specimens were dyed in a dye solution containing 1% of Blue PR" (trade name of Andoz Company) at a bath ratio of 1:50.

Then, the dyeability (dying spots) of the repeated heat treatment system was evaluated for the five experimental gold yarns described above.

The results are shown in Table 1. *Experiment 4 was conducted in the same way as in Example 4, except that the same jet nozzle was used and no pores were used.Furthermore, the staining spots were ranked as follows by visual observation.

5th grade...I can't find anything (no plot) 4th grade...
...Grade 3, where faint streaks are observed in the longitudinal direction of the yarn...Grade 2, where streaks are clearly observed in the longitudinal direction of the yarn, albeit partially...Yarn Grade 1, in which streaks are observed in the longitudinal direction of the strips... As is clear from the above results, the streaks are noticeable and marbled in appearance, when the fluid jet nozzle of the present invention is used, It can be seen that there are almost no heat treatment spots and that the process is stable.

Example 2 A latent crimp yarn obtained by rubbing polyester filament yarn 150 de/30 fil against a rubbing pin (material: ceramic, diameter = 4 mm) was subjected to relaxation treatment 4 according to the method of Example 1. .

Further, as a comparative example, processing was performed using a jet nozzle without pores γ.

Table 2 shows the total crimp rate (value under 2 mg/de load) and dyeability.

What can be said from the results in Table 2 (Well, as a result of the heat treatment using the jet nozzle of the present invention, there is of course no problem of dyeing spots, and the total crimp rate is high, which is due to the fact that the individual filaments are opened. This shows that it has undergone sufficient heat treatment.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the fluid jet nozzle body according to the present invention, Fig. 2 is a perspective view of the cover, Figs. 3 and 4 are illustrations of the opened state of the yarn, and Fig. 5 is the pore Transverse cross-sectional view showing -fII of drilling (cut along the line AA' in Fig. 4. 1... Fluid jet nozzle body, 2... Yarn introduction hole, 3... - Throat, 4... Expansion chamber, 5... Yarn processing path, 6, 6'... Fluid ejection path, 1... Socket, 8, 8'.
...Fluid supply chamber, 9.11...Bolt groove, 10...
Body cover 12... bolt.

Claims (6)

[Scope of utility model registration request] (1) Yarn introduction path 2, throat 3, tapered expansion chamber 4
, a processing path 5 that widens toward the end, and are arranged coaxially in this order, and the throat portion 3 includes a -41 fluid ejection path 6 ,
In the fluid jet nozzles provided in parallel to each other at 6',
A fluid jet nozzle for opening and heat treating yarn, which is formed in a corner of the expansion chamber 4 and outside the yarn path with a pore 7 that communicates with the outside air. (2) The fluid jet nozzle according to claim 1, wherein the pores γ have a circular cross section with a diameter of 0.2 mm to 3 mm. (3) The fluid jet nozzle according to claim 1, in which the pores are inclined with respect to the plane in which they are formed. (4) The fluid jet nozzle according to claim 1, wherein the throat portion 3 has a rectangular cross section. (5) The fluid jet nozzle according to claim 1, wherein the expansion chamber 4 has a rectangular cross section. (6) The fluid jet nozzle according to claim 1, wherein the yarn treatment path 5 has a rectangular cross section.