JPH07126911A - Spinneret for melt spinning - Google Patents

Abstract

PURPOSE:To provide a melt-spinning spinneret capable of spinning a plural kinds of yarns of wide yarn variety with a single spinneret at the same time by opening nozzle holes on a circular spinneret in the form of blocks having specific arrangement and spacings between holes for each yarn. CONSTITUTION:Nozzle holes 2 are opened on a circular spinneret 1 having a diameter (a) of 70-140mm in the form of blocks for respective yarns. The gap (b) between the blocks is 8-35mm and the number of blocks is 2-4. The nozzle holes of each block are arranged in alternate zigzag form on the cross points of plural parallel linear line groups having a spacing (c) of 5-10mm and >=4 parallel linear line groups having a spacing (d) of 3-10mm. The number of nozzle holes on each block is 12-100. The chimney cooling air is blown in the direction of the arrow 3 to minimize the generation of turbulent air flow and enable stable melt-spinning of a yarn having a filament fineness of 0.5-20d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt spinneret, and more particularly to a melt spinneret for filaments which can be stably spun without causing single yarn interference during spinning.

[0002]

2. Description of the Related Art Synthetic fibers such as polyester and polyamide are widely used as raw materials for woven fabrics, knitted fabrics, etc. In recent years, fine single yarn denier multifilament yarns and functionality have been pursued in pursuit of soft texture. The market needs for thick single yarn denier wool filament yarn are increasing. As a method for producing thin single-filament denier multifilament yarn, the number of discharge holes per unit area of the die is increased as much as possible, and the condition of the molten polymer discharged from the discharge holes is kept constant without causing single-thread interference. For a short period of time, uniformly cool and solidify,
A method of supplying a spinning oil and winding the same for the purpose of imparting antistatic property and smoothness is generally used, and many techniques have been disclosed as to a method of uniformly cooling and solidifying without causing single yarn interference. ing.

For example, Japanese Patent Publication No. 47-2047 and Japanese Patent Publication No. 54-36691 disclose a spinning method using a spinneret in which ejection holes are arranged in a radial or zigzag pattern on a plurality of concentric circles. In the case of the bases arranged above, the number of concentric circles is large and the intervals between concentric circles are small, so
The passage of cooling air is insufficient, and it is difficult to uniformly cool and solidify in a short time. Therefore, yarn spots and dyeing spots are likely to occur. In addition, there is a defect that, for the purpose of strengthening the cooling and when the cooling air volume is increased, single yarn interference occurs and yarn breakage occurs.

Further, JP-A-5-33209, JP-A-5-125609 and JP-A-5-17150.
No. 6 discloses a method for obtaining a fine denier multifilament yarn efficiently and with a good process condition to obtain a uniform product. However, the melt-discharging polymer is thinned by the spinneret and method shown in these disclosed techniques. The range of yarn types that can be stably produced without causing interference of single yarns by the completion of cooling and solidification is the range of ultra-fine single yarn denier with single yarn denier of 1.0d or less, and single yarn denier of 1 If it is 0.5 d or more, the melt-discharge polymer is thinned as in the prior art, and there is a drawback that single yarn interference occurs and spinning yarn breakage occurs by the time the cooling and solidification are completed.

On the other hand, as a method of spinning a thick single-filament denier-oligo filament yarn, as compared with the case of a multi-filament yarn, it is easy to secure a sufficient distance between discharge holes so as not to cause single yarn interference. The conventional technique disclosed in Japanese Examined Patent Publication No. Sho 47-8764 is also sufficient. However, these prior arts have a method of spinning a single filament multifilament yarn with one spinneret,
It has the drawback of low productivity. In the case of employing a multi-spindle spinning method in which a plurality of yarns are spun by a single spinneret in order to enhance productivity, in the case of a thick single yarn denier egofilament yarn as well as in the case of a multifilament yarn, in the prior art, It has a major drawback that the melt-discharged polymer becomes fine and cannot be spun without causing single yarn interference until cooling and solidification are completed.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. A discharge hole is formed at an intersection point on a straight line of a circular spinneret which has been widely used in the past. By staggering them in a zigzag pattern, the generation of turbulence that occurs when the cooling air hits the individual units melted and discharged is suppressed to a minimum, eliminating irregular fluctuations of individual single yarns and cooling. The smooth flow of the wind enables uniform cooling, and thus the range of single yarn denier of the yarn types that can be produced without causing single yarn interference is in an extremely wide range of 0.5 to 20d. It is intended to provide a melt-spinning spinneret capable of stable production.

[0007]

That is, according to the present invention, in a multi-spindle simultaneous spinneret in which discharge holes are arranged in blocks in a circular spinneret having a diameter of amm, and the intervals between the blocks are bmm, the discharge holes are repeatedly cycled. staggered on the intersection formed by two or more groups of parallel straight lines of cmm and four or more groups of parallel straight lines intersecting the straight line group, and satisfying the following conditions Is a melt-spinning spinneret. (1) 70 ≤ a ≤ 140 (2) 8 ≤ b ≤ 35 (3) 5 ≤ c ≤ 10 (4) 3 ≤ d ≤ 10 (5) 2 ≤ number of blocks ≤ 4 (6) 12 ≤ discharge of each block Number of Holes ≦ 100 Hereinafter, the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of a two-thread simultaneous spinning spinneret of the present invention, and FIG. 2 is a comparative example of one embodiment of a two-thread simultaneous spinning spinneret having concentric circles and equidistant discharge holes. It is a schematic diagram showing.

In the melt-spinning spinneret according to the present invention, as shown in FIG. 1, discharge holes are arranged in blocks for each yarn in a spinneret having a diameter of 70 to 140 mm, and the intervals between the blocks (separation zones).
Is 8 to 35 mm, and the discharge holes of each block are formed by two or more parallel direct groups each having a repeating cycle of 5 to 10 mm and four or more parallel linear groups intersecting the direct group at a repeating cycle of 3 to 10 mm. The number of blocks forming the yarns is 2 to 4, and the number of discharge holes of each block is 12 to 100. The diameter of the base is 70 to 140 mm, 7
If it is less than 0 mm, it will be substantially difficult to produce a yarn simultaneous spinning spinneret having the discharge hole arrangement of the present invention. On the other hand, if it is 140 mm or more, the area of the spinneret will be too large. The diameter of the die must be 70-140 mm in order to be processed. The discharge holes are arranged in blocks for each yarn, and the interval between the blocks is 8 to 35 mm, because it is necessary to divide each yarn during winding during melt spinning, and the workability of accurate division is high. In order to secure the above, the distance between the blocks is required to be 8 mm or more. On the other hand, when the distance is 35 mm or more, the discharge hole disposition area is reduced, and it becomes substantially difficult to manufacture the die of the present invention. The discharge holes of each block must have a length of 8 to 35 mm, and a group of two or more parallel straight lines having a repeating period of 5 to 10 mm and a group of four or more parallel straight lines intersecting the straight line group at a repeating period of 3 to 10 mm. The staggered alternate arrangement on the formed intersections is because if the distance between the groups of straight lines parallel to the separation zone of each block is less than 5 mm, the passage of the cooling air is insufficient, especially in the case of single yarn denier yarn types of 3d or more. More shaking Since the single yarn interference occurs yarn breakage trouble with the yarn unevenness is increased so generated and,
5 mm or more, preferably 6 mm or more, on the other hand, 1
If it is 0 mm or more, the effective arrangement area of the discharge holes becomes small and it becomes impossible to maintain a sufficient number of discharge holes. Therefore, the interval of the straight line groups parallel to the separation band of each block must be 5 to 10 mm, preferably 6 to 10 mm. Further, the repeating period of the straight line group intersecting with the straight line group parallel to the separation band of each block is 3 to 10 mm. If the length is less than 3 mm, the single yarn interference due to the yarn deviation easily occurs, and particularly, the yarn having a single yarn denier of 3d or more is used. Since the yarn breakage trouble occurs in the case of 3 kinds, it is necessary to be 3 mm or more, preferably 5 mm or more, more preferably 6 mm or more, while if it is 10 mm or more, the effective arrangement area of the discharge holes becomes small, and a sufficient number of discharge holes can be maintained. Since it disappears, it must be 10 mm or less.

The number of each straight line group is two or more and four or more in order to secure a sufficient number of ejection holes as necessary. Further, the crossing angle of each straight line group is most preferably vertical, but it may be a diagonal crossing in the range of vertical ± 45 ° C. Further, the reason why the ejection holes are alternately arranged in a staggered manner on the intersections formed by the respective straight line groups is to avoid single yarn interference due to yarn deflection. Yarn shake occurs because the balance between the horizontal force generated by the wind flow of the cooling wind and the vertical force caused by being pulled downward is lost, and the yarn shake in the front-back direction and the yarn passing through the air at high speed In order to avoid single yarn interference that causes actual damage such as yarn unevenness and yarn breakage trouble, the left and right yarn shakes are generated by the cooling air flow acting on the air flow caused by the generated air resistance. , It is necessary that the space between adjacent discharge holes on the front, back, left, and right is wide enough, but in reality, there is a constraint from the viewpoint of economic efficiency, and it is necessary to shorten the discharge hole space as much as possible. The present invention has been reached.

That is, by staggering the staggered arrangement, the substantial discharge hole interval can be expanded to 2c in the left-right direction and 2d in the front-rear direction, and 2c and 2d without staggered arrangement. As a result, the discharge hole arrangement density can be significantly increased as compared with the case where the discharge hole interval is maintained.

Next, the number of blocks forming the yarn is 2 to 4, and the number of discharge holes in each block is 12 to 100. This means that when spinning multiple yarns simultaneously from the same spinneret. Since the molten polymer flowing into the die causes a viscosity difference due to the temperature difference and the thermal decomposition difference between the center part and the outer peripheral part of the die, the denier difference between yarns increases as the number of blocks increases as the discharge amount varies. The number of blocks must be 2-4. Further, when the number of discharge holes is less than 12, it is possible to cope with the conventional art die instead of the die of the present invention. On the other hand, when it is 100 or more, the present invention becomes difficult to deal with. The number of discharge holes must be 12 to 100. On the other hand, in the case of the comparative example of FIG. 2, it is difficult to blow through the chimney cooling air, only the single yarn on the blowing side of the cooling air is cooled more strongly, and the single yarn on the side opposite to the blowing side of the cooling air is cooled. Insufficiently causes a difference in yarn quality between single yarns, and the chimney cooling air blows out along the outer peripheral portion of the yarn and the central separation zone, so that the single yarns on the outer peripheral portion of each yarn are irregular. Causes a so-called single yarn interference that causes contact with an adjacent single yarn, and thus the minimum distance between discharge holes is 9 mm or more for a yarn type with a single yarn denier of 3 d or more, and a single yarn denier of 5 d or more. 10 mm or more for
For a yarn type having a single yarn denier of 10 d or more, it is necessary to secure 15 mm or more, and it is practically difficult to achieve a discharge hole arrangement density equivalent to that of the die of the present invention.

The melt-spinning spinneret of the present invention comprises a multifilament having a single filament denier of 4.0 g / min to a multifilament having a fine denier of 4.0 g / min and a discharge rate of 0.2 g / min per hole. It can be applied satisfactorily over a wide range of spinning speeds of 1000 to 8000 m / min with a very wide range of yarn types up to filaments. Further, the discharge hole array of the present invention is not limited to a circular cross section, but also has a non-circular cross section hole (T hole, Y hole,
PENTA LOBAL, OCTA LOBAL, flat holes, hollow holes, etc.) can also be applied favorably. Further, the discharge hole arrangement of the present invention is not limited to a circular multi-thread simultaneous spinning spinneret, but is also a circular single-spindle single-spindle spinneret and non-circular (square, rectangular, oval) single-thread and multi-thread. It can be well applied to a simultaneous spinneret.
The melt spinneret of the present invention can be applied very well as a melt spinneret of thermoplastic polymers such as polyester, polyamide, polypropylene, polyethylene, and various copolymers and modified polymers based on these polymers.

[0014]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Example 1 In a circular two-thread simultaneous spinning spinneret having a diameter a = 100 mm as shown in FIG.
10 mm, 8 with a repetition period c = 5 mm parallel to the separation band
Book straight line group and repetition period d = 5 m orthogonal to the straight line group
48 blocks of each block in a staggered manner on the intersection formed by a group of 15 straight lines of m (hole diameter 0.23 mm,
A spinneret in which L / D = 2) was alternately arranged was produced. For comparison, as shown in FIG. 2, a conventional type concentric circular array 2 yarn spinneret (a = 100 mm, b = 10 mm, minimum hole distance 7.5 mm, hole diameter 0.23 mm, L / D =
2) and a conventional linear array two-thread simultaneous spinneret (a = 100 mm, b = 10 mm, c = 7) as shown in FIG.
mm, d = 7 mm, hole diameter 0.23 mm, L / D = 2).

Using these spinnerets, polyester chips having an intrinsic viscosity of 0.65 and a titanium oxide content of 0.025% by weight are melt-spun at a spinning temperature of 295 ° C., and after cooling, divided into two yarns. And apply 0.6% of spinning oil, and take up 50D-48f, 100D at a spinning speed of 3250 w / min.
-48f, 150D-48f, 250D-48f, 35
Multifilaments of 0D-48f and 450D-48f were obtained. For cooling at this time, a single sided cooling chinim for cooling is used, and a mouthpiece is attached so that cooling air is blown from the direction of the arrow in FIGS.
Wind speed of 15 to 35 m / s between cm and 120 cm
It was cooled with a chimney cooling air having a temperature of 21 ° C. Tables 1, 2 and 3 show the yarn unevenness of the multifilaments obtained at this time and the yarn breakage during spinning.

[0017]

[Table 1]

[Table 2]

[Table 3] Experiment No. 1 to 6 show the number of yarn breakages and yarn unevenness when melt-spun polyester yarn types of single yarn denier 1d to 9d using the staggered alternate arrangement spinneret of the present invention shown in FIG. As for the yarn type, there was almost no occurrence of yarn breakage and the yarn unevenness was good. On the other hand, Experiment Nos. 7 to 12 in Table 2
As a comparative example, using the conventional concentric circular array spinneret shown in FIG. 2, the number of yarn breakages and yarn unevenness when melt-spun polyester yarn types of single yarn denier 1d to 9d are shown. Regarding yarn types, there are many yarn breakage problems due to single yarn interference, and yarn unevenness corresponding to the yarn wobbling level occurs during the process of cooling and solidification of the melt-discharging polymer during spinning. It was unattainable. On the other hand, the experiment No. 13-18 show the number of yarn breakages and yarn unevenness when melt-spun polyester yarn types of single yarn denier 1d-9d using the conventional linear array spinneret shown in FIG. 3 as a comparative example. However, for all the yarn types, the results are slightly improved as compared with Table 2 (Experiment No. 7 to 12) as a comparative example, but Table 1 (Experiment No. 7) using the spinneret of the present invention was used. 1
The number of yarn breakages and the yarn unevenness are far inferior to those of (6) to (6), and they could not be adopted at all for industrial production.

[0018]

As described above, according to the spinneret of the present invention, the fine single yarn denier multifilament yarn having a single yarn denier of 0.5d level is changed to the single yarn denier 20d level of the thick single yarn and the denier yarn. A wide range of yarn types up to filament yarns can be produced by simultaneous spinning of 2 to 4 yarns with the same spinneret while maintaining stable operability and maintaining good quality.

[Brief description of drawings]

FIG. 1 is an example of a discharge hole layout of a two-thread simultaneous spinning spinneret showing an embodiment of the present invention.

FIG. 2 is an example of a discharge hole arrangement diagram of a conventional two-fiber simultaneous spinning spinneret with concentric circles and the like.

FIG. 3 is an example of a discharge hole arrangement drawing of a conventional linear array two yarn simultaneous spinning spinneret.

[Explanation of symbols]

 1: Spinneret 2: Discharge hole 3: Chimney cooling air blowing direction

Claims (1)

[Claims] 1. In a multi-spindle simultaneous spinneret in which discharge holes are arranged in a block in a circular spinneret having a diameter of amm, and the intervals between the blocks are bmm, the discharge holes are two or more straight lines with a repeating cycle of cmm. Melt spinning, characterized in that they are alternately arranged in a zigzag pattern on the intersections formed by four or more parallel straight lines with a repeating cycle dmm intersecting the groups and the straight lines, and that the following conditions are met: Mouthpiece. (1) 70 ≤ a ≤ 140 (2) 8 ≤ b ≤ 35 (3) 5 ≤ c ≤ 10 (4) 3 ≤ d ≤ 10 (5) 2 ≤ number of blocks ≤ 4 (6) 12 ≤ discharge of each block Number of holes ≤100