JPH09228137A - Apparatus for producing fine-denier high-multifilament yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a fine-denier high-multifilament yarn, provided with a spinneret having a specific structure, etc., and effective for producing the yarn having improved homogeneity in improved productivity without causing the abnormality in cross-section, the end breakage under the spinneret and the uneven dye sorption. SOLUTION: This yarn-producing apparatus contains a spinneret, a heating zone under the spinneret and a plurality of godet rollers. The spinneret has >=150, preferably 150-300 nozzles 11a arranged on plural concentric circles, the linear distance L between the adjacent concentric circles is 3-8mm and the linear distance between the outer adjacent circles is larger than that of the inner adjacent circles. The linear distance D between adjacent nozzles on each concentric circle is 3-8mm and is successively increased from the outer circle to the inner circle. Each of the nozzle 11a preferably has an area of 20-50mm<2> .

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a high fineness
ess) high multifilamen yarn (high multifilamen
The present invention relates to an apparatus for producing a t yarn), and more particularly to an apparatus for producing a polyester high multifilament yarn having a fineness of 0.5 denier or less by using a single spinneret.

[0002]

2. Description of the Related Art In the production of such thin high multifilament yarns, a) achieving a uniform molecular weight distribution in the spinning resin; b) a decrease in spinning viscosity due to an increase in spinning temperature and a lower part of the spinneret. It is important to prevent non-uniformity in the cross-section of the original spinning filament due to rapid cooling in c .; and c) prevent filament breakage on the surface of the spinneret due to reduction in spinning tension.

Generally, conventional spinnerets have spinneret holes arranged in a concentric array (FIG. 4) or a square array (FIG. 5). In the concentric circle arrangement, the mouthpiece holes are arranged on a plurality of concentric circles that are evenly spaced, and on the respective concentric circles, at regular intervals. That is, as shown in FIG. 4, the straight line distance L between adjacent concentric circles and the straight line distance D between adjacent mouthpiece holes on the same concentric circle are constant. Such a concentric array is good for uniform distribution of the polymer and uniform cooling effect at the top of the spinneret, but it is difficult to form a large number of spinneret holes within the limited area of the spinneret. is there. On the other hand, in the case of the square arrangement, more die holes can be formed in the same area as compared with the concentric circle arrangement, but in this square arrangement, there is a disadvantage that the cooling and solidification of the polymer is not uniform between the die holes. is there.

For the above reasons, it has been difficult in the prior art to increase the number of filaments produced by one spinneret to more than 100. In other words, it has been difficult in the prior art to produce a high-definition, high-multifilament yarn using a single spinneret. For example, Teijin Co., Ltd. 64/144 is the finest high multifilament yarn produced using one conventional spinneret. Conventional high multifilament yarns having desired fineness are manufactured by using two or four spinnerets instead of one spinneret.

On the other hand, a spun filament is drawn by a straight drawer (spin drawer), but since a high multifilament yarn is composed of many filaments of high fineness, a special technique is required for drawing. To be done. That is, a conventional straight stretcher includes a godet roller having a dual roller structure including a main roller and a separating roller. The main roller is driven by a motor, thereby transferring the filament, while the separating roller is driven by friction generated when the filament is transferred by the driving force of the main roller.

[0006]

Increasing the number of spinneret holes in one spinneret reduces the distance between adjacent spinneret holes. If the distance between adjacent spinneret holes in one spinneret is too short, various problems occur in the production of high multifilament yarn with high fineness. For example, the cooling of the high multifilament will be non-uniform across all die holes. The filaments from adjacent spinneret holes come into contact with each other and fuse together, resulting in yarn breakage. Further, tension is increased on the spinning surface of the spinneret, and the spun filament is likely to break.

[0007] Further, when the straight drawing machine having the above-mentioned roller type structure is used for drawing a high multifilament yarn, since the high multifilament yarn is composed of a large number of filaments having a high fineness, There are various problems such as filament breakage, filament uneven drawing, and the occurrence of dyeing differences between filaments.

Accordingly, the present invention arranges the maximum number of spinneret holes within a limited spinneret area without formation of filaments of poor cross-section due to uneven cooling and solidification and thread breakage in the lower region of the spinneret. Includes an array of spinneret holes, which eliminates various process instabilities such as filament breakage on the godet roller, uneven filament stretching, and dyeing differences between filaments. ,
An object of the present invention is to provide a high multifilament yarn manufacturing apparatus having a high fineness.

[0009]

The present invention comprises a spinneret, a heating zone set at the bottom of the spinneret, and a plurality of godet rollers, the spinneret comprising at least 150 spinnerets arranged in a plurality of concentric circles. On a plurality of concentric circles that have holes, the linear distance between adjacent concentric circles is in the range of 3 to 8 mm, and the linear distance between the inner adjacent circles is larger than that between the outer adjacent circles. The linear distance between the adjacent mouth holes of 3 is 3
Provided is a high multifilament yarn manufacturing apparatus having a high fineness, in which the linear distance between adjacent spinneret holes on the inner concentric circle is sequentially larger than that on the outer concentric circle. In the apparatus of the present invention, it is desirable that the heating zone below the spinneret has a length of 5 to 10 cm, and at least the first heating zone of the godet roller.
The godet roller is preferably composed of dual rollers driven by a dedicated driving means.

[0010]

The present invention will be described in more detail with reference to the accompanying drawings showing one embodiment of the present invention. In the present invention, as shown in FIG. 2, the spinneret (11) is fitted inside the spinning head (10), and the spinneret holes (11a) are basically arranged in concentric circles as shown in FIG. There is.

The linear distance (L) between adjacent concentric circles is calculated by the following formula
(I)

[Equation 1] (In the formula, n represents the number of concentric circles, and the smaller number afterwards means the concentric circles arranged on the outer side). D) is the following formula (II)

[Equation 2] As shown in the formula (n represents the same meaning as described above), it is smaller on the concentric circles arranged inside than on the concentric circles arranged outside. The arrangement of the spinneret holes as described above makes the filaments spun continuously from the spinneret holes of the spinneret have a wider space between each other, and the cooling air blown from the outside is passed through the wide space secured between the filaments to spin inside. The filaments can be smoothly reached to the filaments to be spun, and all spun filaments are cooled uniformly.

In the present invention, the straight line distance between the concentric circles adjacent to the outer side is smaller than the straight line distance between the concentric circles adjacent to the inner side. Therefore, the number of concentric circles arranged on the outer side is arranged on the inner side. The number of concentric circles is larger than the number of concentric circles, and it is possible to arrange many cap holes in the same concentric circle number (n). The spinneret arrangement of the present invention allows a minimum of 1 spinneret.
It is possible to arrange 50 to 300 base holes.

The straight line distance (L) between adjacent concentric circles is 3 to 8 m.
m, preferably 4 to 6 mm, more preferably 5 to 6 mm, and the linear distance (D) between adjacent mouthpiece holes on each concentric circle is 3
~ 8 mm, preferably 4-6 mm, more preferably 5-6
mm. The straight line distance (L) between adjacent concentric circles and the straight line distance (D) between adjacent spinneret holes are the minimum values of 3 mm. When the distance is smaller than that, adjacent filaments come into contact with each other and uniform cooling of all filaments is achieved. Solidification cannot be achieved. On the other hand, when the maximum value of the straight line distance (L) between adjacent concentric circles and the straight line distance (D) between adjacent spinneret holes, that is, 8 mm or more, a desired number of spinneret holes for producing a high multifilament yarn is processed into a spinneret. Difficult to do.

The area of each spinneret hole in the spinneret is 20 to 5
0 mm ^2, preferably 30 to 50 mm ^2. When the area of the die hole is smaller than 20 mm ² , adjacent filaments come into contact with each other, and uniform cooling and solidification of all filaments cannot be achieved. Also, the area of the die hole is 50
When it is larger than mm ^2, it becomes difficult to process the desired number of die holes for producing the high multifilament.

In the present invention, in order to eliminate the filament breakage phenomenon under the spinneret (11), a heating zone (20) is set directly under the spinneret (11) as shown in FIG. It The heating zone (20) has a length of about 5-10 cm, preferably about 5-8 cm. If the length of the heating zone (20) is too short, the effect of eliminating the filament breakage phenomenon that occurs just below the spinneret (11) is insufficient, and if it is too long, the quenching effect decreases and the filament The cross section becomes uneven.

In order to eliminate the filament breakage phenomenon that occurs immediately below the spinneret (11), the heating zone (2
0) is maintained above the spinning temperature by about 20-50 ° C, preferably about 30-40 ° C. If the temperature of the heating zone is too high, the energy consumption becomes large, and if it is too small, the effect of eliminating the filament breakage phenomenon that occurs just below the spinneret (11) becomes insufficient.

In the production of fine high-multifilament yarns, the spinning temperature is usually set as high as possible in order to improve the filament breakage phenomenon that occurs immediately below the spinneret. The heating zone allows the spinning temperature to be set low, eliminating the possibility of resin degradation due to too high a spinning temperature. Even when the spinning temperature is set low, the heating zone smoothes the resin flow on the spinning surface of the spinneret and remarkably improves the filament breakage phenomenon that occurs immediately below the spinneret. In FIG. 2, reference numeral 30 is a quenching chamber prepared just below the heating zone (20).

In the present invention, as shown in FIG. 3, the straight stretcher includes a pair of godet rollers GR1 and GR2. The first godet roller (GR1) has a dual roller structure including a pair of main rollers, and is driven by respective drive motors (not shown). The first godet roller differs from the godet roller of a conventional straight drawing machine in that it has a dual roller structure, but the operating conditions such as the number of turns of filament on the roller and the operating temperature are different from those of the conventional straight drawing machine. The conditions are the same.

As a first godet roller (GR1), by adopting dual rollers driven by respective drive motors, on the conventional godet roller in which the main roller is driven by the drive motor and the separation roller is driven by friction. Instability in the process such as yarn breakage of high-fineness high multifilaments that may occur, uneven drawing, and difference in dyeing between filaments is eliminated.

[0020]

The present invention will be described in more detail with reference to Examples and Comparative Examples. Example 1 288 mouthpiece holes each having a cross-sectional area of 30 mm ² are formed on a plurality of concentric circles with a minimum distance between adjacent concentric circles (L _{2 to} L ₁ ) of 4 mm and inner distances between concentric circles that are successively larger. Circular spinneret and spinning in which concentric circles are arranged by setting the distance (D _n ) between adjacent spinneret holes on the innermost concentric circle, which is the distance between holes, to 4 mm, and gradually increasing the distance between adjacent spinneret holes on the outer concentric circles. A spinning machine comprising a 5 cm long heating zone set at 40 ° C. above the temperature and a first godet roller of the dual roller type was used to produce a high multifilament yarn with a fineness of 0.5 denier. . The spinning result
It is shown in Table 1.

EXAMPLE 2 192 mouthpiece holes each having a cross-sectional area of 45 mm ² were formed on a plurality of concentric circles having a minimum distance between adjacent concentric circles (L _{2 to} L ₁ ) of 6 mm and an inner distance between the concentric circles being successively larger. The concentric circle arrangement in which the distance between adjacent spinneret holes (D _n ) on the innermost concentric circle, which is the distance between adjacent spinneret holes, is 6 mm, and the distance between adjacent spinneret holes on the outer concentric circle is sequentially increased. High multifilament yarn with a fineness of 0.5 denier using a spinning device including a spinneret, a heating zone of 5 cm length set to 40 ° C. higher than the spinning temperature, and a first godet roller of dual roller type. Was manufactured. The spinning result
It is shown in Table 1.

Example 3 192 mouthpiece holes each having a cross-sectional area of 45 mm ² were formed on a plurality of concentric circles having a minimum distance between adjacent concentric circles (L _{2 to} L ₁ ) of 6 mm and inner distances between the concentric circles being successively larger. The concentric circle arrangement in which the distance between adjacent spinneret holes (D _n ) on the innermost concentric circle, which is the distance between adjacent spinneret holes, is 6 mm, and the distance between adjacent spinneret holes on the outer concentric circle is sequentially increased. High multifilament yarn with a fineness of 0.3 denier using a spinning device including a spinneret, a heating zone of 4 cm length set to 50 ° C. above the spinning temperature, and a first godet roller of dual roller type. Was manufactured. The spinning result
It is shown in Table 1.

Comparative Example 1 192 mouthpiece holes each having a cross-sectional area of 45 mm ² were provided on a plurality of concentric circles having a constant distance (L) between adjacent concentric circles of 6 mm. Using a conventional circular spinneret with a constant 6 mm concentric arrangement, a heating zone of 5 cm length set to 40 ° C. above the spinning temperature, and a dual roller first godet roller, High multifilament yarn with a fineness of 0.5 denier was produced. The spinning results are shown in Table 1.

COMPARATIVE EXAMPLE 2 192 mouthpiece holes each having a cross-sectional area of 30 mm ² were formed on a plurality of concentric circles having a minimum distance between adjacent concentric circles (L _{2 to} L ₁ ) of 4 mm and inner distances between the concentric circles, which were successively larger. The concentric circle arrangement in which the distance (D _n ) between adjacent spinneret holes on the innermost concentric circle, which is the distance between adjacent spinneret holes, is 3 mm, and the distance between adjacent spinneret holes on the outer concentric circle is sequentially increased. High multifilament yarn with a fineness of 0.5 denier using a spinning device including a spinneret, a heating zone of 5 cm length set to 40 ° C. higher than the spinning temperature, and a first godet roller of dual roller type. Was manufactured. The spinning result
It is shown in Table 1.

COMPARATIVE EXAMPLE 3 192 mouthpiece holes each having a cross-sectional area of 30 mm ² were formed on a plurality of concentric circles with a minimum distance between adjacent concentric circles (L _{2 to} L ₁ ) of 4 mm and inner distances between the concentric circles that were successively larger. The concentric circle arrangement in which the distance between adjacent spinneret holes (D _n ) on the innermost concentric circle, which is the distance between adjacent spinneret holes, is 4 mm, and the distance between adjacent spinneret holes on the outer concentric circle is sequentially increased. High multifilament yarn with a fineness of 0.5 denier using a spinning device including a spinneret, a heating zone of 15 cm length set to 40 ° C. above the spinning temperature, and a first godet roller of dual roller type. Was manufactured. The spinning results are shown in Table 1.

COMPARATIVE EXAMPLE 4 192 mouthpiece holes each having a cross-sectional area of 30 mm ² were formed on a plurality of concentric circles having a minimum distance between adjacent concentric circles (L _{2 to} L ₁ ) of 4 mm and inner distances between the concentric circles that were successively larger. The concentric circle arrangement in which the distance between adjacent spinneret holes (D _n ) on the innermost concentric circle, which is the distance between adjacent spinneret holes, is 4 mm, and the distance between adjacent spinneret holes on the outer concentric circle is sequentially increased. Using a spinner comprising a spinneret, a 5 cm long heating zone set at 40 ° C. above the spinning temperature and a conventional first godet roller consisting of a main roller and a separating roller,
High multifilament yarn with a fineness of 0.5 denier was produced. The spinning results are shown in Table 1.

[0027]

[Table 1]

[0028]

EFFECTS OF THE INVENTION By using the apparatus for producing a high multifilament yarn of high fineness according to the present invention, an abnormal cross-section of the spinning filament, yarn breakage under the spinneret, yarn breakage on a godet roller and uneven drawing It is possible to manufacture a high multifilament yarn with uniform physical properties and high fineness without causing dyeing difference between filaments. Therefore, not only the productivity is improved as compared with the conventional method for producing a high multifilament yarn using two or four spinnerets, but also a high multifilament yarn is produced due to the physical property deviation of the spinning base yarn between the spinnerets. Poor physical properties can be avoided.

[Brief description of drawings]

FIG. 1 is a plan view of a spinneret in which spinneret holes of the present invention are concentrically arranged.

FIG. 2 is a schematic side view showing set positions of a heating zone of the present invention.

FIG. 3 is a schematic view illustrating a process in which a filament is spun through an apparatus provided with a pair of godet rollers, one of which is a dual roller type and the other of which is a separation roller type according to the present invention.

FIG. 4 is a schematic view showing a concentric array of conventional die holes.

FIG. 5 is a schematic view showing a square array of conventional die holes.

[Explanation of symbols]

 10: Spinning head 11: Spinneret 20: Heating zone 30: Quenching chamber GR1: First godet roller GR2: Second godet roller L: Straight line distance between adjacent concentric circles D: Straight line between adjacent spinneret holes on the same concentric circle distance

Claims (7)

[Claims] 1. A spinneret (11), a heating zone (20) set below the spinneret, and a plurality of godet rollers, the spinneret (11) having at least 150 holes arranged in a plurality of concentric circles. With a mouth hole (11a), the linear distance (L) between adjacent concentric circles is in the range of 3 to 8 mm, and the linear distance between the inner adjacent circle is larger than that between the outer adjacent circle. On the concentric circles, the linear distance (D) between the adjacent mouthpiece holes on each concentric circle is in the range of 3 to 8 mm, and the linear distance between the adjacent mouthpiece holes on the inner concentric circle is larger than that on the outer concentric circle. The high multi-filament yarn manufacturing equipment with high fineness 2. Each of the spinneret holes (11a) of the spinneret has two holes.
The high multifilament yarn manufacturing apparatus according to claim 1, having an area of 0 to 50 mm ² . 3. The high multifilament yarn manufacturing apparatus according to claim 1, wherein the spinneret has a number of spinneret holes of 150 to 300. 4. The apparatus for producing high multifilament yarn according to claim 1, wherein the heating zone (20) has a length of 5 to 10 cm. 5. The high multifilament yarn manufacturing apparatus according to claim 1, wherein the temperature of the heating zone (20) is maintained at 20 to 50 ° C. higher than the spinning temperature. 6. At least a first of the godet rollers
The high multifilament yarn manufacturing apparatus according to claim 1, wherein the pair of rollers of the godet roller (GR1) are dual rollers driven by dedicated driving means. 7. A high-definition high-multifilament having a number of filaments of at least 150 and a fineness of 0.5 denier or less, which is produced by using the high-multifilament yarn producing apparatus according to any one of claims 1 to 6. yarn.