JPH06280106A - Melt-spinning device - Google Patents

Abstract

PURPOSE:To provide a melt-spinning device capable of reducing the generation of the irregularity of spun filaments in their longitudinal direction and stably spinning the filaments. CONSTITUTION:The characteristic of this melt-spinning device comprises disposing a gas flow-rectification means having a space surrounding a spun filament passage 11 between a spinning pack B and a cooling air-charging means 3, and disposing the gas flow-charging port C for controlling a gas flow in the gas flow rectification means 13 at a part of the gas flow-rectification means 13, the gas flow-rectification means 13 being disposed in a length L of 5-70mm in the travel direction of the spun filaments 2 and in a distance K of 5-35mm between the lower end edge part of the space 12 and the spun filaments 2 positioned on the outermost periphery of the spun filaments 2, and the gas flow-rectification means 13 being further disposed at such a position that a distance J between the lower surface of the spinneret 1 of the spinning pack B and the upper surface of the gas flow-rectification means 13 is 40-200mm.

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 reducing fineness unevenness in a longitudinal direction of a yarn when melt-spinning a thermoplastic polymer.

[0002]

2. Description of the Related Art Generally, in a melt spinning apparatus, a thermoplastic polymer is discharged from a spinneret and the spun yarn is wound while being cooled by cooling air. In that case, a device in which a cover made of, for example, a plate-like member is provided in the lower portion of the die to avoid unevenness in fineness is known from, for example, Japanese Patent Publication No. 53-38769. An outline of this device is shown in FIG. That is, in FIG. 3, the thermoplastic polymer discharged from the spin pack B is spun out from the spinneret 1 as the yarn 2 and taken up by the take-up roller 5. The cooling air is blown from the cooling air supply unit 3 onto the yarn 2 as a uniform flow. In this apparatus, a space having a height H in the range of 30 to 300 mm below the spinneret 1 and a width F in the range of 100 to 500 mm outward from the outermost peripheral spun yarn discharge port of the spinneret is provided. The yarn take-up side end of the space is covered with the plate-like body A leaving a gap of 35 mm to 60 mm from the position of the outermost peripheral spun yarn. The smaller the gap G between the outermost spun yarn and the plate, the more effective it is to prevent the temperature fluctuation of the spinneret and the fluctuation of the temperature and air flow in the space.
If it is made too small, the vortex flow induced by the plate-like body is generated near the yarn, and if it is made too small, the unevenness of the fineness is increased. Therefore, the gap G needs to be specified to be 34 mm to 60 mm. The spun yarn is then designed so that cooling air can be blown across it.

However, in the device in which the closed space 20 covered with the plate-like body A is provided in the lower portion of the mouthpiece 1 in the above-mentioned prior art, the closed space 20 is likely to become a decompression side due to the accompanying airflow when the yarn is pulled at a high speed. Therefore, since the airflow enters from the lower part of the closed space in order to keep the balance, there is a problem that fineness unevenness occurs in the longitudinal direction.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the prior art, reduce the fineness unevenness in the longitudinal direction of the yarn during melt spinning, and perform stable spinning. An object is to provide a melt spinning apparatus that can be used.

[0005]

In order to achieve the above-mentioned object, the present invention adopts the technical constitution as described below. That is, in a spinning device equipped with a spinning pack and cooling air supply means provided on the lower side of the pack, spinning is performed by connecting the closed space 20 between the spinning pack and the cooling air supply means. An airflow rectifying means having a space portion surrounding the yarn passage is provided, and an airflow opening for controlling the airflow inside the airflow rectifying means is provided in a part of the airflow rectifying means, and the airflow rectifying means is provided. The means has a length in the traveling direction of the spun yarn of 5 to 70 mm, and the distance between the peripheral edge of the lower end of the space and the spun yarn located at the outermost periphery of the spun yarn is 5 to 35 mm. Further, the airflow rectifying means is a melt spinning apparatus in which the distance from the lower surface of the spinneret part of the spinning pack to the upper surface of the airflow rectifying means is 40 to 200 mm.

[0006]

In the melt spinning apparatus according to the present invention, since the technical structure as described above is employed, the lower surface of the spinneret of the spinning pack and the cooling air supply means provided on the lower side of the pack are provided. In the closed space portion 20 provided between them, an airflow is separately supplied into the closed space portion 20 from the outside of the closed space portion 20 according to the reduced pressure state in the closed space portion 20,
Since the air flow rectifying means for adjusting the pressure in the closed space portion 20 is provided, the pressure in the closed space portion 20 is stably maintained, and as a result, the fineness unevenness of the spun yarn is reduced. It becomes possible to prevent effectively.

[0007]

EXAMPLES Specific examples of the melt spinning apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a specific example of the melt spinning apparatus 10 according to the present invention. In the figure, a thermoplastic synthetic polymer for spinning is fed under a predetermined pressure via a polymer supply unit 8. After being supplied to the spinning pack B, a large number of filaments 2 are spun from a spinneret 1 provided on the lower surface of the spinning pack B, and taken up by a take-up roller 14 at a predetermined spinning speed,
Finally, the winding means 7 winds it up to a predetermined drum 15. At this time, the spun yarn 2 receives the cooling air from the cooling air supply means 3, which is usually called a chimney, and is taken out while being cooled.

In a specific example of the present invention in such a melt spinning apparatus, a spinning apparatus 10 including a spinning pack B and a cooling air supply means 3 provided on the lower side of the spinning pack B is provided.
Further, between the spinning pack B and the cooling air supply means 3, there is an air flow rectifying means 1 having a space 12 surrounding the spinning yarn passage 11.
3, the airflow opening C for controlling the airflow inside the airflow rectifying means 13 is provided in a part of the airflow rectifying means 13.
And the air flow rectifying means 13 has a length L in the traveling direction of the spun yarn 2 of 5 to 70 mm,
The peripheral edge of the lower end of the space 12 and the outermost periphery D of the spun yarn 2
The distance K from the spinning yarn 2 positioned at 5 to 35 mm is set, and the air flow rectifying means 13 further includes a distance J from the lower surface of the spinneret portion 1 of the spinning pack B to the upper surface of the air flow rectifying means 13. Has a configuration of the melt spinning apparatus 10 set at a position of 40 to 200 mm.

That is, in the present invention, in order to solve the above-mentioned problems in the prior art, the inventors of the present application have made diligent studies, and as a result, as a result, the lower surface of the spinneret of the spin pack B and the lower side of the spin pack. That the pressure state in the closed space 20 provided between the cooling air supply means 3 and the unstable state is the cause of the fineness unevenness of the spun filament. It has been known, and in order to eliminate the cause, the closed space portion 20 is provided in the closed space portion 20.
According to the depressurized state in the inside, the air flow is supplied from the outside of the space into the space 12 to adjust the pressure in the closed space 20, and the air flow rectifying means 13 is provided to solve the problem. As a result, it becomes possible to stably maintain the pressure in the closed space portion 20, and as a result, it is possible to effectively prevent the occurrence of fineness unevenness of the spun yarn.

Next, FIG. 2A is a view showing the structure of an example of the air flow rectifying means 13 used in the present invention and the positional relationship with the yarn 2. FIG. 2B is a diagram showing the configuration of another example of the airflow rectifying body 13 according to the present invention. Airflow rectifying means 1 according to the present invention with reference to both figures.
An example of a specific configuration of No. 3 will be described.

The structure of the airflow rectifying means 13 is not particularly limited as long as it has the above-mentioned function, but if one example is explained, the airflow rectifying means 13 is conventionally used. It is connected to the closed space 20 in the art, and is attached to the plate-shaped body A shown in FIG. 3 or used in place of the plate-shaped body A.

Therefore, the airflow rectifying means 13 is basically provided with a space portion 12 for securing the yarn passage portion 11 of the spun yarn, because the spun yarn passes therethrough. The part 12 is connected to the closed space part 20 described above, and the air flow rectifying means 13 has its upper end supported by a support plate 6, and the support plate 6 is spun by the spinning device by an appropriate means. It is fixed to the support of the pack B.

The air flow rectifying means 13 must be provided at a position where the distance J from the lower surface of the base 1 is 40 to 200 mm. Further, the distance K between the inner wall of the lower end portion of the air flow rectifying body 13 and the outermost circumference of the yarn at that position needs to be 5 mm to 35 mm. When the thickness is 5 mm or less, the yarn and the inner wall of the cylindrical airflow rectifying body are narrow, so that the possibility of contact even with a slight yarn shake increases. If it is set to 35 mm or more, from the space between the yarn and the lower portion of the cylindrical airflow rectifier 13 into the pack housing,
That is, the airflow easily enters the closed space 20. Further, the distance L from the upper end to the lower end of the airflow rectifier 13 is 5
~ 70 mm is required. If it is less than 5 mm, it is impossible to prevent the airflow from entering the pack housing directly below the mouthpiece.
Further, when it is 70 mm or more, turbulent air flow is likely to be generated due to hitting the cooling air coming from the cooling air supply section.

The shape of the air flow rectifying means 13 is not particularly limited as long as it forms the above-mentioned space portion 12, but, for example, as shown in FIG. 2A,
It is preferably composed of a hollow cylindrical body.

In the melt-spinning apparatus of the present invention, the thickness of the yarn, the number of yarns, etc. are determined according to the purpose of use of the yarn, and in order to make those yarns, the suitable pack B and spinneret 1 are selected. Change the length of the pack if necessary. Therefore, the positional relationship of the airflow rectifier 13 also changes accordingly.

The air flow rectifying means 13 may have any shape as long as it surrounds the yarn in the production state, but it is divided into at least two blocks 4 and 5 and these are divided into a plurality of blocks. It may be configured so as to be integrated and used by an appropriate coupling means.

Further, as described above, an appropriate amount of airflow can flow into the space 12 of the airflow rectifying means 13 in order to stabilize the air pressure in the closed space 20, as described above. As described above, the airflow opening C is provided, but it is desirable that the airflow opening C be provided in the airflow rectifying means 13 portion closer to the cooling air supply means 3 than the space 12. , More specifically, the air flow rectifying means 1
It is preferable to provide it on the supporting plate 6 that holds the sheet 3.

That is, as shown in FIG. 2A, the cooling which is close to the outer peripheral portion of the space 12 in the supporting plate 6 supporting the air flow rectifying means 13 and is the chimney. The airflow opening C is provided on the side of the air supply means 3.

By providing the air flow opening C, a part of the air flow ejected from the cooling air supply means 3 is
Since the air is once introduced into the closed space 20 through the airflow opening C and flows out of the closed space 20 together with the accompanying airflow flowing from the closed space 20 through the space 12, the closed space 20 is closed. It is possible to prevent fluctuations in the pressure inside the space 20.

Further, according to another example of the airflow rectifying means 13 according to the present invention shown in FIG. 2B, the airflow opening C '.
Is provided on the air flow rectifying means 13 on the side opposite to the cooling air supply means 3 when viewed from the space 12, that is, at a position lower than the support plate 6. However, the airflow supply opening C is indispensable, and when the amount of air supplied from this part is insufficient due to the convenience of the facility, etc., if the supply ports are provided side by side with C and C ′, it becomes even better than C alone.

Further, a heating / cooling device and a forced air flow supply device may be attached to the upper or lower part of the air flow rectifier or the air flow rectifier, or may be built in.

The shape of the air flow supply opening C may be any of a slit, a round hole, and a deformed hole. The size of the air flow supply openings C and C ′ is preferably 3 to 50% of the area formed by the air flow rectifying blocks 4 and 5.

Examples 1 to 5 and Comparative Examples 1 to 6 Next, examples using the apparatus of the present invention will be described in more detail. 80 g from a spinneret 1 having 140 hole spinning holes, each of which has 2 holes of 70 holes, melted at 290 ° C. with polyethylene terephthalate having an intrinsic viscosity of 0.6 using the melt spinning apparatus shown in FIGS. Discharge at 1 / min for 3000m
It was wound by the winding means 7 at a speed of 1 / min. The distance J from the bottom of the die surface to the upper surface of the cylindrical airflow rectifier 13 is 100 mm,
The results are shown in Table 1 as Examples 1 to 5.

On the other hand, for comparison, an example in which the values of K and L of the melting prevention device shown in FIG.
.About.5, and an example of use of the conventional spinning device of FIG. 3 is shown as Comparative Example 6.

The fineness unevenness of the yarn is measured by using a wound yarn with U% EVENES.TESTER manufactured by Keiki Kogyo Co., Ltd.

[0026]

[Table 1] As can be seen from Table 1, using the device of the invention,
It is found that a yarn having a small fineness unevenness can be obtained, and the fineness unevenness is further reduced by using a device in which the airflow openings C and C ′ are used in combination (Example 6).

[0027]

The melt spinning apparatus of the present invention has a single yarn fineness of 1.
When it is 5 denier or less, the effect is particularly remarkable when spinning multiple yarns. By reducing the fineness unevenness in the longitudinal direction of the yarn, the spinnability and drawability are improved. Furthermore, high-order permeability is stable, and when the product is a woven or knitted product, it does not cause horizontal spots or vertical streaks.

[Brief description of drawings]

FIG. 1 is a side view showing the configuration of a specific example of the melt spinning apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration example of an airflow rectifying means used in the melt spinning apparatus according to the present invention, and FIG.
FIG. 2B is a plan view showing an example of such an airflow rectifying means, and FIG.
[Fig. 6] is a side view showing another example of such an air flow rectifying means.

FIG. 3 is a side view showing an example of the configuration of a conventional melt spinning apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spinneret 2 ... Spinning yarn 3 ... Cooling air supply means 4, 5 ... Air flow rectification block 6 ... Support plate 7 ... Winding means 8 ... Polymer supply unit 10 ... Melt spinning device 11 ... Spinning yarn passage 12 ... Air flow Space part of rectifying means 13 ... Airflow rectifying means 14 ... Take-off roller 15 ... Drum 20 ... Closed space B ... Spinning pack C, C '... Airflow opening D ... Outermost part of spun yarn

Claims (7)

[Claims] 1. A spinning apparatus comprising a spinning pack and cooling air supply means provided on the lower side of the spinning pack, wherein a spinning yarn passage is surrounded between the spinning pack and the cooling air supply means. An airflow rectifying means having a space is provided, and an airflow opening for controlling the airflow inside the airflow rectifying means is provided in a part of the airflow rectifying means, and the airflow rectifying means is provided for the spinning. The length of the yarn in the traveling direction is 5 to 70 m
In m, the distance between the peripheral edge of the lower end of the space and the spinning yarn located on the outermost periphery of the spinning yarn is set to 5 to 35 mm. The distance from the lower surface of the part to the upper surface of the air flow rectifying means is 40 to 20.
The melt spinning apparatus is characterized in that it is set at a position of 0 mm. 2. The melt spinning apparatus according to claim 1, wherein the air flow rectifying means is formed in a cylindrical shape, and the air flow rectifying means is further held by an appropriate supporting plate. 3. The melt spinning apparatus according to claim 2, wherein the air flow rectifying means having the cylindrical shape is divided into at least two blocks. 4. The melt-spinning apparatus according to claim 1, wherein the air flow opening is provided in the air flow rectifying means portion closer to the cooling air supply means than the space portion. 5. The melt-spinning apparatus according to claim 1, wherein the air flow opening is provided in the air flow rectifying means portion on the side opposite to the cooling air supply means when viewed from the space. . 6. The melt spinning apparatus according to claim 4, wherein the airflow opening is provided in the support plate. 7. The melt spinning apparatus according to claim 5, wherein the air flow opening is provided in a part of a cylindrical portion of the air flow rectifying means.