JPH02277808A - Spinneret - Google Patents

Abstract

PURPOSE:To obtain a spinneret for forming a modified cross-section fiber having high modification degree and good reeling property of yarn and low fluffing in false-twisting by radially arranging >=3 specific slits. CONSTITUTION:Three or more slits 2 each widening toward the tip and having circular tip end are radially arranged and connected with each other at the center of a spinneret. The width W1 of the narrowest part of the slit is 0.05-0.15mm and the width W2 of the widest part of the slit satisfies the formula 1.5<=W2/W1<=3. The radius R of the circumscribed circle of the nozzles satisfies the formula (W1+W2)<=R<=5(W1+W2).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a 5゜44-shaped spun spinneret of thermoplastic synthetic fibers, more specifically, a highly irregular cross-section having at least 3 or more slits. The present invention relates to a spinneret for producing fibers.

[Prior art 1 Conventionally, the discharge hole shape of a spinneret for irregular cross-section fibers commonly used is a regular triangle, a Y-shape, a 17-shape, a T-shape, etc. in the case of a triangular cross-section, and a square cross-section. In the case of the shape, it has a cross shape, and in the case of a 5.5-hexagonal shape, it has a shape such as a star, a book shape, etc. In particular, the slit widths of the radial slits in the Y, T, dry, ★, and main character shapes are the same at the central portion where they connect to the tiles, as shown in (a) of Figures 3 and 4.

In addition, (b) of FIG. 3-4 is a cross section of the fiber obtained from the discharge hole of (a).

Fibers with irregular cross sections obtained using spinnerets having these shapes, particularly fibers with triangular and hexagonal cross sections as shown in FIGS. 3 and 4 (b), are used for special purposes.

In other words, triangular cross-section fibers are known to have a squeaky feel and a texture similar to silk, while hexagonal cross-section fibers are known to have a texture similar to silk. 9 The irregular cross-section fibers used in these applications, such as those used in the field of sports clothing and school uniforms, have a squeaky feel and are important to eliminate shine, but this is largely due to the degree of irregularity. Depends on it. Here, the degree of irregularity is expressed by the ratio of the diameters of the circumscribed circle and the inscribed circle of the fiber cross section, and the larger this ratio is, the higher the degree of irregularity is.

[Problem to be solved by the invention] Fibers with a triangular cross section, especially fibers with a regular Y shape, depend on the length of the slit, but if the degree of irregularity is large, a creaking feeling occurs when I fibers overlap and rub against each other. is close to Kinunari, and again 3
Irregularities and glare that tend to occur on corner cross sections are also reduced. On the contrary, fibers having a regular triangular shape or an isosceles triangular shape have less squeaky feeling and more irritation.

When fibers with a hexagonal cross section have a low degree of irregularity and become regular hexagonal, the cross-sectional shape after false twisting or twisting using a spindle or disk method is +=flat and the protrusions disappear.

As a product, there is a problem of increased shine.9 Also, when these protrusions disappear, the diffused reflection of light decreases.17 It tends to look whitish on casual clothes, etc. Shown is a discharge hole (spinneret) 11,
When polyester is melt-spun using 1.2, the spinning properties are slightly worse than when the cross-section is round, and there is no particular problem, but as shown in Nos. 3 to 4 (M no.+7), The degree of irregularity of the fiber cross section is not very high, and the function as an additional h11 value is reduced.

In order to solve these problems, a yarn spinning method has been developed to further increase the degree of irregularity of irregular cross-section fibers. For example, it is possible to increase the degree of irregularity by increasing the spinning speed or increasing cooling, but when thermoplastic synthetic fibers are discharged from a spinneret where they are melted, -a Due to the ballast effect, the shape bulges out from the cross section of the discharge hole, and 5 is wound in a round shape, so the degree of irregularity is highly dependent on the discharge hole.9 Therefore, 5 is arranged radially as 1 gold when spinning to increase the degree of irregularity. Make the length of the slit very long [-
It has more than one or as many circles or equidistant as the number of chamber-shaped cross sections,
Connect with the same width around that point [-1 gold, etc. can be considered. Figures 5 and 6 are examples of such discharge holes (caps) ((a) in the figure) and the cross section of the fibers obtained from them ((b) in the figure). This is an example of the latter.

If polyester is melt-spun and wound using the spinneret 13 shown in FIG. 5(a), a product with a very high degree of irregularity can be obtained. , the cross section after winding is easy to break, and unwinding in the subsequent process is poor.
There is a problem in that the spots on the fibers become larger after dyeing.

Furthermore, when polyester is melt-spun and wound using the spinneret 14 shown in FIG. 5(B), the bond between the circular portion at the tip of the slit and the slit portion is weak.

As time passes, the number of yarn breakages increases, and at the same time, when the spindle, etc. is subjected to L-false twisting after winding, the protrusions are reduced, resulting in a lot of fuzz, resulting in poor unwinding properties, and the degree of irregularity is also improved to the extent intended. I didn't.

The present invention has been made in view of the current situation, and it provides a fiber with a high degree of irregularity in the cross-section of the melt-spun and cooled fiber, which has low yarn unwinding properties and little fluffing before false twisting. The main purpose of the conflict was to provide spinnerets for manufacturing.

[Means for Solving the Problems] That is, the present invention provides a spinning method in which at least three or more slits are arranged radially and have a cross-sectional discharge hole connected to each other in the center [in one metal, the following formula ( a), (
c)) A spinning yarn (-1 gold) characterized in that all the slits widen toward the tip and the tip is arcuate, as shown by adding a to (c).

(a,)0.05≦W,≦0.15 1-mm
1 (L>)! ,,5≦'wV2/'J≦3(c)W
t +W2 ≦R≦5 (Wl +W2)
[mm'1 Here, W, Width at the narrowest part of the slit width W2 Width at the widest part of the slit width 11: Radius of the circumcircle of the discharge hole As a circular head with a large diameter is formed, the slit width decreases from the head to the root tree, and each slit connects. There is no sudden decrease or expansion of the slit width, and the shape satisfies the above formulas (a), (b), and (C) at the same time.

In this case, if W is narrower than 0-05, the discharge becomes unstable and the spinning condition deteriorates, and the problem of 1-crop -f= occurs; conversely, if W becomes too wide, the degree of irregularity decreases [I Fiber cannot be obtained.

Moreover, if W 2 / W + is larger than 3, the degree of irregularity will not be achieved and it will be rounded, which is not good. If it is smaller than 1.5, the spinning tension will become 11 and become unstable. Furthermore, the radius R of the circumscribed circle of the discharge hole must be l≦R/(wt +'W2)S5; if it is less than 1, the degree of irregularity will not occur, and if it is greater than 5, the spinning condition or It becomes.

In addition, by making the tip of the slit arc-shaped, the flow of the discharged polymer becomes even and the spinning pattern -r is very stable, and a sufficient degree of irregularity is maintained. Become.

Hereinafter, 1.-1 The present invention will be explained based on aspects 1 and 4. 1st
Figure (A) is a top view of the discharge hole showing the 1-1 example of the present invention. circumscription of +11C
It is a Y-shaped discharge hole surrounded by a semi-circular head 3 whose diameter in contact with the circumscribed circle C is W2, and a tapered shape in the direction of the center O with the diameter W2 of the head 3 as the maximum width. The slit 2 includes a slit 2 having a body portion 4 that gradually decreases in width, and each body portion 4 joins at the base of the body portion 4 with a minimum width W to form a confluence portion 5.

Although the head 3 is usually circular in shape, it may also be in the shape of an arc or a similar smooth curve. Also, the body portion 4 does not necessarily have to be tapered, and may have different slopes on both sides or one side, or may have a smooth curve. The 11th surface of the discharge hole in the shape [4] is constructed based on the same concept as in FIG. 1(a).

Figure 1 (b) and Figure 9 ([7] show the cross sections of the fibers melt-spun from the discharge holes in Figure 1 (a) and Figure 2 (a), respectively. 9. 1 Example in which it can be seen that the degree of irregularity is present.Next, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to the following examples unless it exceeds the gist thereof.

Using a spinneret with various discharge holes, I
Polyethylene terephthalate with a V of 064 was melt-spun at 290°C at a cooling rate of 4. After cooling at ON m'/min, apply oil etc. and wind at a winding speed of 4.500 m7 min to obtain a hexagonal cross section system of 100 denier/24 poles.
The results are not shown in Table 1.9 In Table 1, the number of times the yarn broke during the spinning tension of 480 dots is shown in terms of α fraction.

Warber fluff creel 276 grove with warping speed 4.001 [2 at 1/min
The number of fuzz generated per 106 m when warping is performed per 00,000 m. Number of fluff/<276 x 20 200,000 m) - ((L 018X Number of fluff)/10"m.

degree of abnormality It is expressed as the ratio of the inscribed circle and circumscribed circle of the cross section, and the ratio The larger the number, the greater the degree of abnormality.

(F margin) ``Effects of the invention J As explained in F-F, according to the present invention, yarn breakage is small and the spinning condition is very stable, and in addition, the spinneret has a higher shape and is more durable than conventional spinnerets. It becomes possible to stably obtain irregular cross-section fibers that are highly processable, and products with high added value can be easily produced.

[Brief explanation of drawings]

(A) and (B) in FIG. 1 are a plan view showing a specific example of the present invention and a cross-sectional view of the obtained fiber, and (A) and (B) in FIG.
B) is a plan view showing another specific example of the present invention, a cross-sectional view of the obtained fiber, (A), (b) of FIGS. 3 to 4, and 5 to 6.
Figures (a) and (b) are a plan view showing a conventional concrete N and a comparative example, and a cross-sectional view of the obtained fibers, respectively. ■−・・・・・・・・・Discharge hole 2・・・−・・・・Slit 3・・・−・・・・・・Head 4・・・・・・・Body part 5・・・・...merging section

Claims (1)

[Claims] A spinneret having a cross-sectional discharge hole in which at least three or more slits are arranged radially and connected to each other in the center, satisfying the following formulas (a), (b), and (c). A spinneret characterized by all the slits widening towards the tip and having an arcuate tip (a) 0.05≦W_1≦0.15 [mm] (b) 1.
5≦W_2/W_1≦3 (c) W_1+W_2≦R≦5 (W_1+W_2) [m
m] Here, W_1: Width W of the narrowest part of the slit width
_2: Width R of the widest part of the slit width: Radius of the circumcircle of the discharge hole