JPH05125609A - Spinneret - Google Patents

Abstract

PURPOSE:To provide a spinneret, a multihole spinneret having a specified number of specifically arranged delivery holes, useful for fine multifilament yarns, giving high efficiency, capable of giving high-quality products in a stable manner smoothly. CONSTITUTION:The objective spinneret where >=90 delivery holes 11 arranged in a square lattice form as a whole [corresponding four delivery holes 11 adjacent to one another form a square lattice at each interval of p, and these lattices further form a larger square lattice at each interval of q (q>=2.5p), being arranged in a double square lattice form.]. It is preferable that p be 1.0-3.0mm with (q-p) >=2.5mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a spinneret, particularly fine denier.
The present invention relates to a melt spinneret for multifilaments.

[0002]

2. Description of the Related Art Synthetic fibers such as polyester and polyamide are widely used as materials for woven fabrics, knitted fabrics, non-woven fabrics, etc., but in recent years, monofilament denier has been used to improve the texture and functionality of these fabrics. It tends to be thin.

For example, 5 instead of 50 de / 36 fil
0de / 48fil, 50de / 72fil, 50de
/ 96fil, or 75de / 72fil, 75de / 96fil, 75 instead of 75de / 36fil
De / 128 fil is often desired.

In order to efficiently manufacture these fine denier multifilament yarns, it is necessary to perforate a large number of discharge holes in one die. However, it is 9
When 0 or more discharge holes are arranged, it is difficult to cool the melted and discharged yarns, so that a tight break between the fibers may occur, and the obtained yarns may also have uneven stains. However, there was a defect that the uniformity of the tool deteriorated.

FIG. 5 shows the arrangement of the discharge holes 1 arranged in a conventionally known square lattice shape. In this case, the distance between the discharge holes 1 is r
Indicated by. Generally, when r is 4.0 mm or more, the cooling air can pass between the discharge holes 1, in other words, between discharge filaments, but r is 4.0.
When the thickness is less than or equal to mm, particularly 3.0 mm, it becomes difficult for the cooling air to penetrate, which may cause the discharge filament to oscillate.

Therefore, the discharge filament closer to the well-known cooling air blowing surface is cooled but easily shakes, and conversely, the discharge filament located on the far side is not forcedly cooled because the cooling air does not pass through. ..

As a result, as described above, it is unavoidable that the discharge filament is subjected to close filament breakage, stain spots are generated even before filament breakage occurs, and the uniformity of denier is deteriorated.

FIG. 5 shows an example of a square lattice shape, but the situation is the same whether it is a well-known diamond lattice shape or a spinneret with multiple concentric circumferential arrangements.
As long as the discharge holes are essentially evenly distributed, the cooling air cannot pass through, so the above problem cannot be solved. In order to solve this problem, the area of the spinneret should be increased, but this time it is technically difficult to distribute a constant discharge amount of the polymer thinly and widely to the discharge holes, and there is a limit.

There is also a method in which yarns discharged from two or more spinnerets are combined and wound up, but in this method, since the discharge amount per spinning pack becomes small, the yarn production productivity is deteriorated, and the polymer is used. Since the melt retention time of-becomes longer and thermal deterioration proceeds, there is a concern that spinnability will deteriorate.

[0010]

In view of the above conventional problems, the inventors of the present invention have been able to reduce productivity without lowering productivity.
Moreover, fine denier that does not deteriorate the spinning condition and is excellent in quality
As a result of diligent studies on a spinneret for obtaining a rumultifilament, it was found that this object can be achieved by designing a discharge hole in a specific arrangement which has not been reported in the past, and the present invention has been completed.

[0011]

That is, the present invention is 90
In a multi-hole spinneret having more than one discharge hole,
The discharge holes are arranged in a square lattice shape as a whole, and the corresponding four adjacent discharge holes form a square lattice with a space p, and at a square lattice position with a space q forming a double square lattice with the square lattice. The spinneret is characterized in that q ≧ 2.5p is established while providing a bored discharge hole.

The present invention will be specifically described below with reference to the drawings. 1 is a partially enlarged view of an arrangement of discharge holes showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the discharge holes of FIG.

The melt spinneret according to the present invention has discharge holes arranged in a double square lattice as shown in the figure. That is, four adjacent ejection holes 11 form a square lattice with a space p, and the square lattice also forms a square lattice with a space q. In the case of FIG. This is an example in which the bases are arranged in a square lattice shape over the entire surface. The most important thing in this arrangement is to ensure a passage for the cooling air to pass through.

That is, the cooling air passes through q-p without passing through p. Therefore, q−p needs to be larger, and in practice q ≧ 2.5p is essential. When q is less than 2.5 p, the cooling air penetrates into any of the discharge holes as in the case of FIG. 5, but cannot pass through any of the holes, so that the spinning tone and the obtained yarn quality are remarkably increased. Make it worse.

More specifically, p is 1.0 mm or more and 3.0
mm or less is preferable. When p is 1.0 mm or less, the adjacent ejection filaments are excessively close to each other, and thus the close contact may occur due to the balus effect or the like even if the yarn shake is small. On the other hand, if it is 3.0 mm or more, the cooling air can enter during the interval p, which causes the yarn to shake.

Further, q-p is preferably 2.5 mm or more, more preferably 4.0 mm or more. Here, when q-p is 2.5 mm or less, the cooling air does not enter, and therefore cannot serve as a wind passage. q-p is 4.0m
When it is m or more, the cooling air can selectively flow between q and p without any resistance, so that the discharge yarn is less likely to be swung.

The spinneret in the present invention is required to have 90 or more discharge holes. If the number of discharge holes is less than 90, it is possible to design with a conventionally known square lattice array, diamond lattice array, or multiple concentric circumferential array die, regardless of the present invention.

In the spinneret of the present invention, since the passage through which the cooling air flows is specified, each discharge filament is not cooled in all directions but is cooled only in one direction. This is not preferable when the monofilament denier obtained after spinning is thick, but there is no particular problem for the thin monofilament brand targeted by the present invention.

Therefore, the spinneret of the present invention is preferably applied to melt spinning of fine denier multifilaments in which the discharge rate per hole is 0.7 g / min or less.

The shape of the discharge hole in the vertical cross-sectional direction in the present invention may be any known shape in addition to the conventionally known shape, but as shown in FIG. The shape is such that it has individual discharge holes 11. By designing the shape in the direction of the vertical section in this way, the probability that four adjacent ejection filaments ejected from the square lattice with the interval p will sway in parallel increases. That is, since the interlocking property of the yarn shake becomes high, there is an advantage that the number of contact yarn breakage decreases.

The above is an example in which the ejection holes are arranged so as to be dispersed and distributed over the entire die, but preferably the ejection holes are within a range of a radius R (10 mm or more) from the die center O as shown in FIG. It is more preferable to arrange the discharge holes in a shape in which 11 does not exist and the grid is missing. In FIG. 3, the four discharge holes 11 form a square lattice with a space p, and the square lattice also forms a square lattice with a space q, but within a specific range from the position of the center O of the die, that is, within a range of a radius of 10 mm. The discharge holes 11 do not exist at all. This is because the central passage of the cooling air is sufficiently secured, and the passage therethrough is further improved as compared with the case of the overall arrangement as shown in FIG.

That is, when there is no discharge hole in a certain area in the center of the die, a central passage for cooling air can be secured in the vertical direction, so that the cooling air flowing into the multifilament group is directed downstream from the center of the die. Then, the single fibers are cooled and discharged to the outside of the filament group. As a result, the uniform cooling effect of the filament group is further enhanced, and denier spots and dye spots are further improved.

[0023]

EXAMPLES Hereinafter, the present invention will be described more specifically by way of examples.

[0024]

[Example 1 and Comparative Example 1] p = 2.0 m in the overall arrangement in which the ejection holes are arranged on the entire surface of the die in the arrangement as shown in FIG.
Circular ejection holes (hole diameter 0.15 mm, land length 0.60 m) arranged according to a double square lattice arrangement of m and q = 7.5 mm.
A spinneret (diameter 64 mm, thickness 15 mm) having 144 (4 × 36) m) as a whole was produced.

For comparison, in FIG. 5, r = 3.
A 75 mm square lattice base was similarly prepared.

Using these spinnerets, polyester chips having an intrinsic viscosity of 0.64 and a titanium oxide content of 0.3% by weight were melt-spun at a spinning temperature of 295 ° C. and a spinning speed of 3300 m / min, and 75 de / 144 fil. Fine denier multifilaments of

For cooling at this time, a single-sided horizontal-blow cooling spinning tube was used, and the blowing air velocity was 15 at a distance of 4 cm to 64 cm below the spinneret.
Cooling was performed under the conditions of cm / sec and air volume of 0.6 Nm ³ / min.

Table 1 shows the spinning tone, the denier spots and the dye spots of the obtained fine denier multifilament.

[0029]

[Table 1]

In contrast to the poor spinning, denier spots and dye spots of Comparative Example 1, good results were obtained when the spinneret according to the present invention was used (Example 1).

[0031]

Example 2 and Comparative Example 2 In FIG. 1, p = 1.5 m
Circular discharge holes (hole diameter 0.08 mm, land length 0.48 m) arranged according to a double square lattice arrangement of m and q = 5.2 mm.
A spinneret (diameter 72 mm, thickness 15 mm) having 384 (4 × 96) m) as a whole was produced.

For comparison, in FIG. 5, r = 2.
A 6 mm square lattice base was similarly prepared.

Using these spinnerets, melt spinning was carried out in the same manner as in Example 1 to obtain fine denier multifilaments of 75 de / 384 fil.

For cooling at this time, a single-sided horizontal-blow cooling spinning cylinder was used, and the wind speed was 8 cm / s between 3 cm and 43 cm below the spinneret.
It cooled at ec.

Table 2 shows the spinning tone, the denier spots and the dye spots of the obtained fine denier multifilaments.

[0036]

[Table 2]

In the case of Comparative Example 2, spinning is not possible, whereas
Good results were obtained when using the spinneret according to the invention (Example 2).

[0038]

Examples 3 to 4 and Comparative Example 3 In FIG. 3, p = 2.0
mm, q = 9.0 mm circular ejection holes arranged according to a double square lattice arrangement (hole diameter 0.15 mm, land length 0.6 m)
A spinneret having no discharge holes 11 within a radius R (10 mm or more) from the center having 128 (4 × 32) m) was produced. Also, p = 2.0 mm, q =
A spinneret having a discharge hole 11 in the central portion as shown in FIG. 4 having 128 similar discharge holes arranged according to a double square lattice array of 9.9 mm was produced. Further, for comparison, in FIG. 5, a square lattice die with r = 4.3 mm was similarly produced.

Using these spinnerets, the intrinsic viscosity was 0.
A polyester chip having a titanium oxide content of 0.3% at 64 was melt-spun at a spinning temperature of 295 ° C. and a spinning speed of 3300 m / min.
A fine denier multifilament of 75 de / 128 fil was obtained.

At this time, for cooling, a single-sided horizontal-blow-cooling spinning cylinder was used, and the blowing air velocity was 15 from 4 cm to 64 cm below the spinneret.
Cooling was performed under the conditions of cm / sec and air volume of 0.6 Nm ³ / min.

Table 3 shows the spinning tone, denier spots and dye spots of the obtained fine denier filaments.

[0042]

[Table 3]

[0043]

As described above, according to the present invention, it is possible to obtain a fine denier multifilament yarn efficiently and with a good process condition, and to stably obtain a product of excellent quality. Has a great effect.

[Brief description of drawings]

FIG. 1 is a partially enlarged view of a discharge hole arrangement showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a discharge hole showing an embodiment of the present invention.

FIG. 3 is a discharge hole arrangement view showing another embodiment of the present invention.

FIG. 4 is a discharge hole arrangement view showing another embodiment of the present invention.

FIG. 5 is a partially enlarged view of a conventional discharge hole arrangement.

[Explanation of symbols]

 11 discharge hole 12 introduction hole

Claims (3)

[Claims] 1. In a multi-hole spinneret having 90 or more discharge holes, the discharge holes are arranged in a square lattice shape as a whole, and adjacent four corresponding discharge holes are square lattices with a spacing p. And a discharge hole is provided at a square lattice position with an interval q forming the double lattice and the square lattice, and q ≧ 2.5p is established, and the spinneret is characterized in that 2. The spinneret according to claim 1, wherein the discharge holes are not bored within a radius of 10 mm from the center of the spinneret. 3. p is 1.0 mm or more and 3.0 mm or less, q
The spinneret according to claim 1 or 2, wherein -p is 2.5 mm or more.