JP3308772B2 - High multifilament melt spinning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt spinning apparatus for synthetic fibers, and more particularly to a cooling apparatus capable of stably spinning a so-called high multifilament synthetic fiber having a fineness and a large number of filaments.

[0002]

2. Description of the Related Art Conventionally, as a method for performing stable cooling in a melt spinning apparatus, there has been known an annular cooling method in which cooling air is blown from all directions around a yarn discharged from a die to perform uniform cooling. I have.

There is also a method in which cooling air is blown from a direction substantially perpendicular to the spun yarn (so-called side blowing), and the blowing air is slightly weakened and suction is performed from the opposite side. Further, the blowing direction of the cooling air is slightly upward, instead of substantially perpendicular to the spun yarn.
There is also known a method in which the solidification point of the yarn is brought close to the surface of the mouthpiece to prevent unevenness in fineness due to yarn sway.

In addition, Japanese Patent Application Laid-Open No. 63-145407 discloses that a rectifying plate is provided near a base to rectify cooling air to prevent fusion between fibers and sway of yarn.

[0005]

However, although the annular cooling method has a large effect of preventing thread spots, the equipment tends to be large, and it is difficult to change the conventional side-blowing type cooling cylinder to the annular cooling method. It is.

Further, the method of combining horizontal blowing and suction can be applied only to high-speed spinning in which the spinning speed is 2500 m / min or more, and sufficient cooling cannot be performed at a spinning speed of 2000 m / min or less. . The method in which the angle of the cooling air is directed upward is effective in preventing spots. However, if the angle is set to a large angle exceeding, for example, 40 degrees, the surface of the base cools down, causing a problem in operability. Further, JP-A-63
In the method using the current plate described in JP-A-145407, the single-fiber fineness was small, and when the cooling air was small and the speed was low, the effect of preventing fineness unevenness was not obtained.

To efficiently spin fine and high-count yarns, it is preferable to provide a large number of spinning holes in a single die. The interval becomes narrow, and the passage of cooling air decreases.
For this reason, the cooling conditions are different between the one near the outlet of the cooling air and the one far from the outlet, resulting in a spun yarn having spots.

The present invention has been made to solve these problems, and an object of the present invention is to provide an existing cross-blowing in cooling after discharge of a spinneret at the time of melt-spinning fine fibers having a large number of filaments, which are apt to produce spots. It is an object of the present invention to provide a device which can be implemented by modifying a cooling cylinder of a mold and can stably spin a yarn with less cooling unevenness.

[0009]

The present invention provides a high multifilament having a single yarn fineness of 0.6 denier or less.
Spinning from multiple spinnerets with spinning holes of 0 / cm ² or more
And, from the cooling device to a spinning direction substantially perpendicular blown only cooling air in one direction, detachably provided directly below the mouth gold, spun from a plurality of die opening only in the spray direction by the rectifying cover surrounding the spun yarn was,
A method of melt-spinning a high multifilament, wherein the blown cooling air is circulated around the spun yarn.
Is the law .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the entire melt spinning apparatus, wherein 1 is a die, 2 is a rectifying cover, 3 is a cooling device,
The molten polymer discharged from the die 1 is cooled and solidified by the cooling device 3 to form the filament F, and is wound around the package 5 via the oiling device 4 and the like. FIG.
FIG. 2 is a front view showing the vicinity of the rectifying cover 2, wherein a spun yarn surrounded by the integrated rectifying cover 2 is spun from a plurality of caps 1 a to 1 d.

The base 1 used in the present invention has a single yarn fineness of 0.6.
It spins ultrafine filaments of denier or less, and has a large number of spinning holes provided at a high density such that the density of perforated portions is 2.0 / cm ² or more. The structure of the die 1 itself may be a known one. In addition to the one that spins a normal round-section yarn, various types such as those that spin a modified cross-section yarn or a composite fiber in which a plurality of components are joined can be used. it can.

The cooling device 3 assists the solidification of the molten polymer by spraying cooling air immediately after the molten polymer is discharged from the die. In the case of the present invention, the cooling device 3 blows cooling air in one direction, and has an annular cooling type. It is difficult to use a cooling device or the like in the present invention because it is difficult to install a rectifying cover.
Further, it is preferable that the cooling device 3 is provided with a wind direction adjusting plate 31 so that the angle of the cooling wind is directed upward.
It is preferable that the same cooling air is also supplied to the rectifying cover 2.

An important point of the present apparatus lies in the rectifying cover provided immediately below the base. FIG. 3 is a perspective view showing an example of such a rectifying cover.

As shown in FIG. 1, the rectifying cover 2 has an opening 21 in only one direction, and cooling air is blown into the opening 21. The rectifying cover 2 has shielding walls 22a, 22b and 22c on three sides other than the opening 21. Further, a through hole 25 through which the spun yarn passes is formed on the top plate 23 and the bottom plate 24.
a, 25b are provided, and portions other than the through holes 25a, 25b and the opening 21 are shielded.

As a shape satisfying such a configuration, FIG.
As shown in FIG. 3, a straight box having one side surface removed and through holes 25a and 25b provided on the upper and lower surfaces can be easily manufactured. If the material of the box body has appropriate rigidity, paper can be used. , Wood, metal, synthetic resin, etc. are not particularly limited. Further, in FIG. 3, the box-shaped rectifying cover-2 is used, but the shielding wall 22b to which the cooling air is directly applied may have a curved surface. Thus, the rectifying cover 2
Since it has a simple shape, it is removably installed below the surface of the base with an appropriate means, and the presence or absence of the installation and the installation position are adjusted according to the brand to be spun.

Here, the shape of the opening 21 is preferably determined in consideration of the direction of the cooling air and the opening 21 so that the blown cooling air circulates around the spun yarn. It is preferable that one side of the box is removed as described above, and the size of the opening is appropriately set because it is affected by the conditions of the yarn to be spun, the condition of the cooling air, and the like.

The size of the through holes 25a and 25b should be as close as possible to the passage area E of the filament F so that the cooling air does not easily leak from the gap between the through holes 25a and 25b and the passage area E of the filament F. Is desirable.

The rectifying cover 2 as described above is removably attached directly below the base, and the distance (H) from the base surface to the top plate 23 of the rectifying cover 2 is about 50 to 100 mm. It is preferable in terms of operability. If the rectifying cover is set apart from the base outside the above range, there is a possibility that the uniformity of the spun yarn is lost and the spun yarn becomes large, and on the other hand, the rectifying cover is installed at a position very close to the base. When this is done, the surface of the base cools, causing a problem in operability.

Hereinafter, a method for melt-spinning a high multifilament yarn using the present apparatus will be described. As mentioned above,
The present apparatus is suitable for melt spinning of high multifilament yarns of fine fineness. As such a yarn, for example, a single yarn fineness of 50 to 100 denier and a number of filaments of 90 to 20
It is preferably about 0, and as the polymer to be melt-spun, it is possible to use various types including a polyester type and a polyamide type. Usually, in the melt spinning of polyethylene terephthalate, the spinning speed is about 1000 to 1700 m / min, but when performing the melt spinning using this apparatus, it is 1300 to 1500 m / min.
It is preferable to carry out spinning at a spinning speed of about one minute.

Further, in the case of the present device, the wind speed supplied from the cooling device 3 is preferably about 0.1 to 0.3 m / sec. In addition, other spinning conditions are not particularly different from normal, and in spinning, it is preferable to apply an oil agent or the like by an oiling device 4 such as an oiling roller, and the stretching ratio is such that polyethylene terephthalate is drawn at a normal spinning speed. If you want to obtain a drawn yarn by spinning,
It is good to make it about 2.5 to 3.5 times.

[0021]

In the case of a spinning device which blows cooling air from a normal direction, the filament far from the surface from which the cooling air is blown out is hardly cooled because the cooling air does not pass through much, and unevenness of fineness is generated. On the other hand, in the case of the melt-spinning apparatus using the present apparatus, the cooling air that has passed through the passage area E of the filament F collides with the shielding wall 22b and the like and flows backward to cool the filament far from the cooling air blowing surface. Therefore, uniform cooling is performed, and unevenness of fineness and the like are prevented.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Using the melting prevention apparatus shown in FIG. 1, the number of holes is 144, the hole density is 3.5 / cm ² , and the discharge rate is 0.2.
8 g / hole / minute, spinning speed 1500 mm, 75 d / 14
Melt spinning of 4f polyethylene terephthalate was performed.

At this time, when the rectifying cover shown in FIG. 3 is installed at a position 100 mm below the base (Example 1),
The U% was measured for each of the case where the rectifying cover was installed at the position of 00 mm (Example 2) and the case where the rectifying cover was not installed (Comparative Example 1). Table 1 shows the results. The cooling air was blown at a rate of 0.2 m / min above a position 100 mm below the base of the base, and was taken up at a position of 1000 mm below the base of the base.

[0024]

[Table 1]

As shown in Table 1, when the rectifying cover was installed, it was found that U% was improved and unevenness of fineness was reduced. In addition, by setting the installation position at an appropriate location,
% Is further improved.

[0026]

According to the present apparatus, it is possible to spin a filament yarn having a small fineness without significantly modifying a conventional horizontal spraying type melt spinning apparatus. This is remarkable in the spinning of a fine-filament filament yarn having a high density of a spun yarn which is easy to perform.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the entire apparatus.

FIG. 2 is a front view showing the vicinity of a rectifying cover of the apparatus.

FIG. 3 is a perspective view showing an example of a rectifying cover of the present apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Rectifier cover 3 Cooling device 4 Oiling device 5 Package F filament 21 Opening 22 Shielding plate 23 Top plate 24 Bottom plate 25 Through hole 31 Wind direction adjusting plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D01F 6/62 303 D01D 1/00-13/02

Claims (1)

(57) [Claims] 1. A haima having a single yarn fineness of 0.6 denier or less .
The multifilament, spun from a plurality of die having a 2.0 pieces / cm ² or more spinning holes, a spinning direction substantially perpendicular blown only cooling air in one direction from the cooling device, the mouth gold A cooling air blown by a rectifying cover that is detachably provided directly below and that opens only in the spraying direction and surrounds a spun yarn spun from a plurality of spinnerets, thereby blowing the spun yarn.
A high multifilament melt spinning method, wherein the high multifilament is wrapped around a circle .