JP3252520B2 - 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 reducing the unevenness in the lengthwise 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 this case, a device in which a cover made of, for example, a plate-like body is provided at the lower part of the mouthpiece in order to avoid unevenness of fineness is known, for example, from JP-B-53-3869. FIG. 3 schematically shows this apparatus. That is, in FIG. 3, the thermoplastic polymer discharged from the spin pack B is spun from the spinneret 1 as a yarn 2 and is taken up by the take-up roller 5. The cooling air is blown from the cooling air supply unit 3 to the yarn 2 as a uniform flow. In this apparatus, a space having a height H in a range of 30 to 300 mm below the spinneret 1 and a width F in a range of 100 to 500 mm outward from an outermost spun yarn discharge port of the spinneret is provided. The end of the space on the yarn take-up side is covered with the plate-shaped body A leaving a gap of 35 mm to 60 mm from the position of the outermost spun yarn. The smaller the gap G between the outermost spun yarn and the plate-like body, the more effective it is to prevent fluctuations in the temperature of the die and fluctuations in the temperature and air flow in the space,
If the size is too small, the vortex induced by the plate-like body is generated near the yarn, and if it is too small, the unevenness of the fineness increases. Therefore, the gap G needs to be specified to be 34 mm to 60 mm. The spun yarn is then exposed to cooling air in a direction crossing the yarn.

However, in the above-described prior art apparatus in which the closed space 20 covered with the plate-shaped body A is provided below the base 1, the inside of the closed space 20 is liable to become a decompression side due to the accompanying airflow when the yarn is drawn at high speed. For this reason, there is a problem that a fineness unevenness in the longitudinal direction occurs because an air flow enters from a lower part of the closed space in order to maintain the balance.

[0004]

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

[0005]

The present invention employs the following technical configuration to achieve the above object. That is, in a spinning apparatus including a spinning pack and a cooling air supply means provided at a lower side of the pack, the spinning is performed by connecting to the closed space 20 between the spinning pack and the cooling air supply means. An airflow rectifying unit having a space surrounding the yarn passage is provided, and an airflow opening for introducing an airflow into a space of the airflow rectifying unit is provided in a part of the airflow rectifying unit; The airflow straightening means has a length in the traveling direction of the spun yarn of 5 to 70 mm, and a distance between the lower peripheral edge of the space and the outermost spun yarn of the spun yarn is 5 mm. The air flow straightening means is a melt spinning device in which the distance from the lower surface of the spinneret of the spinning pack to the upper surface of the air flow straightening means is 40 to 200 mm.

[0006]

In the melt-spinning apparatus according to the present invention, since the above-mentioned technical configuration is adopted, the melt spinning device is provided between the lower surface of the spinneret of the spinning pack and the cooling air supply means provided on the lower side of the pack. A separate airflow is supplied into the closed space 20 from the outside of the closed space 20 in accordance with the reduced pressure state in the closed space 20 in the closed space 20 provided therebetween,
Since the airflow 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. As a result, the fineness unevenness of the spun yarn is reduced. This can be effectively prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of a melt spinning apparatus according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of a specific example of a melt spinning device 10 according to the present invention. In the drawing, a thermoplastic synthetic polymer for spinning is applied under a predetermined pressure via a polymer supply unit 8. After being supplied to the spinning pack B, it is spun as a large number of filaments 2 from a spinneret 1 provided on the lower surface of the spinning pack B, and is taken up by a take-up roller 14 at a predetermined spinning speed.
Finally, it is wound up on a predetermined drum 15 by the winding means 7. At this time, the spun yarn 2 is taken off while being cooled by receiving cooling air from cooling air supply means 3 usually called chimney.

In one embodiment of the present invention in such a melt spinning apparatus, there is provided a spinning apparatus 10 including a spinning pack B and cooling air supply means 3 provided on a lower side of the pack B.
And an airflow rectifying means 1 having a space 12 surrounding the spinning yarn passage 11 between the spinning pack B and the cooling air supply means 3.
3 and an airflow opening C for controlling the airflow inside the airflow rectification means 13 in a part of the airflow rectification means 13.
Is provided, and the air flow straightening means 13 has a length L in the traveling direction of the spun yarn 2 of 5 to 70 mm,
The lower peripheral edge of the space 12 and the outermost periphery D of the spun yarn 2
Is set to 5 to 35 mm, and the airflow rectification means 13 further includes a distance J from the lower surface of the spinneret 1 of the spinning pack B to the upper surface of the airflow rectification 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, the inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems in the prior art. As a result, the spinneret lower surface of the spinning pack B and the lower side of the spinning pack are described. That the pressure state in the closed space 20 provided between the cooling air supply means 3 and the cooling air supply means 3 and the instability of the pressure state are the causes of the fineness unevenness of the spun filament. In order to eliminate such a cause, the closed space 20
This problem can be solved by providing an airflow from outside the space to the space 12 in accordance with the depressurized state inside the space 12 and adjusting the pressure in the closed space 20 by the airflow rectification means 13. As a result, the pressure in the closed space 20 can be stably maintained, and as a result, it is possible to effectively prevent the occurrence of unevenness in the fineness of the spun yarn.

Next, FIG. 2A is a view showing a configuration of an example of the air flow rectifying means 13 used in the present invention and showing a positional relationship with the yarn 2. As shown in FIG. FIG. 2B is a diagram showing a configuration of another example of the airflow rectifier 13 in the present invention. Airflow rectification 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 configuration of the airflow rectification means 13 is not particularly limited as long as it has the above-described function. It is connected to the closed space 20 in the art, and is provided alongside the plate-shaped body A shown in FIG.

Therefore, the air flow rectifying means 13 is basically provided with a space 12 for securing the yarn passage 11 of the spun yarn, since the spun yarn passes through the space. The section 12 is connected to the above-mentioned closed space section 20, and the upper end of the airflow rectification means 13 is supported by the support plate 6, and the support plate 6 is appropriately rotated by the spinning device of the spinning apparatus. It is fixed to the support of the pack B.

The airflow rectification 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 at the lower end of the airflow rectifier 13 and the outermost periphery of the yarn at that position needs to be 5 mm to 35 mm. When the diameter is 5 mm or less, the possibility that the yarn and the cylindrical airflow straightener come into contact with each other becomes high because the inner wall of the cylindrical airflow regulating body is narrow. When the length is 35 mm or more, the space between the yarn and the lower part of the cylindrical airflow regulator 13 is inserted into the pack housing.
That is, the air flow 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
７０70 mm is required. If it is less than 5 mm, it is not possible to completely prevent the airflow from entering the pack housing immediately below the base.
If it is 70 mm or more, it hits the cooling air coming out of the cooling air supply unit and easily generates turbulence.

The shape of the airflow rectifying means 13 is not particularly limited as long as it forms the space 12 described above. For example, as shown in FIG.
It is preferable to be constituted by a hollow cylindrical body.

In the melt spinning apparatus of the present invention, the thickness of the yarn, the number of yarns, and the like are determined according to the purpose of use of the yarn. To make those yarns, a pack B and a die 1 suitable for the yarn are selected. Also change the length of the pack if necessary. Therefore, the positional relationship of the airflow rectifier 13 changes accordingly.

The airflow rectification means 13 may be of 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, It may be configured so as to be used by being integrated by an appropriate connecting means.

As described above, an appropriate amount of air flow can flow into the air flow rectification means 13 into the space 12 of the air flow rectification means 13 in order to stabilize the air pressure in the closed space 20. As described above, the airflow opening C is provided, but the airflow opening C is desirably provided in the portion of the airflow rectification unit 13 closer to the cooling air supply unit 3 than the space 12. More specifically, the airflow rectification means 1
3 is preferably provided on the support plate 6 for holding the support plate 3.

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

By providing the airflow opening C, a part of the airflow ejected from the cooling air supply means 3 becomes
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 Fluctuations in the pressure inside the space 20 can be prevented.

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.
Is provided on the airflow rectification means 13 on the opposite side of the cooling air supply means 3 as viewed from the space portion 12, that is, at a position lower than the support plate 6. However, the airflow supply opening C is indispensable, and if the air supply from this portion is insufficient due to facilities or the like, providing a supply port with C and C ′ is even better than using only C alone.

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

The shape of the air flow supply opening C may be any of a slit, a round hole and a modified hole. Further, the size of the airflow supply openings C and C ′ is preferably set to 3 to 50% of the area formed by the airflow rectification 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. Using a melt spinning apparatus shown in FIGS. 1, 2A and 2B, polyethylene terephthalate having an intrinsic viscosity of 0.6 is melted at 290 ° C., and 80 g from a spinneret 1 having 140 holes of spinning holes divided into two groups of 70 holes. 3000 m / min
/ Min by the winding means 7. The distance J from the lower surface of the base 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 apparatus shown in FIG.
5, and Comparative Example 6 shows an example of using the conventional spinning apparatus shown in FIG.

[0025] The fineness unevenness of the yarn is obtained by measuring the wound yarn using U% EVENES TESTER manufactured by Keisoku Kogyo Co., Ltd.

[0026]

[Table 1] As is evident from Table 1, using the device of the present invention,
It can be seen that a yarn having a small fineness unevenness can be obtained, and the use of a device using both the airflow openings C and C ′ further reduces the fineness unevenness (Example 6).

[0027]

The melt spinning apparatus of the present invention has a single yarn fineness of 1.
When the denier is 5 deniers or less, the effect of spinning multiple yarns is particularly remarkable. The spinnability and the stretchability are improved by reducing the unevenness in the lengthwise direction of the yarn. Furthermore, the high order permeability is stable, and when the product is made into a woven or knitted fabric, it does not cause horizontal spots or warp.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration example of an airflow rectification unit used in a melt spinning apparatus according to the present invention, and FIG.
FIG. 2B is a plan view illustrating an example of such an airflow rectification unit, and FIG.
It is a side view which shows the other example of the said airflow rectification means.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spinneret 2 ... Spun yarn 3 ... Cooling air supply means 4, 5 ... Air flow rectification block 6 ... Support plate 7 ... Winding means 8 ... Polymer supply part 10 ... Melt spinning device 11 ... Spun yarn passage 12 ... Air flow Space part of rectification means 13 ... air flow rectification means 14 ... take-up roller 15 ... drum 20 ... closed space B ... spinning pack C, C '... air flow opening D ... outermost peripheral part of spun yarn

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-275706 (JP, A) JP-A-63-145406 (JP, A) JP-A-3-89173 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) D01D 5/08

Claims (7)

(57) [Claims] 1. A spinning apparatus comprising a spinning pack and cooling air supply means provided below the pack, wherein a spinning yarn passage is surrounded between the spinning pack and the cooling air supply means. provided with a flow-guiding means having a space portion, spinning Pas
Space between the airflow rectification means and the
Has a closed space portion connected, the part of the gas flow rectifying means
An airflow opening for introducing an airflow is provided in a space of the airflow rectification means , and the airflow rectification means has a length in the traveling direction of the spun yarn of 5 to 70 mm, and The distance between the lower edge of the portion and the outermost spun yarn of the spun yarn is set to 5 to 35 mm, and the airflow rectifying means further performs the airflow from the lower surface of the spinneret of the spinning pack. A melt spinning device, wherein the distance to the upper surface of the straightening means is set at a position of 40 to 200 mm. 2. The melt spinning apparatus according to claim 1, wherein the airflow rectification means is formed in a cylindrical shape, and the airflow rectification means is further held on a suitable support plate. 3. The melt-spinning apparatus according to claim 2, wherein the airflow rectifying means having the cylindrical shape is divided into at least two blocks. 4. The melt-spinning apparatus according to claim 1, wherein the airflow opening is provided in the airflow rectification unit on the side of the cooling air supply unit with respect to the space. 5. The melt-spinning apparatus according to claim 1, wherein the airflow opening is provided in the airflow rectification means on the side opposite to the cooling air supply means as 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 airflow opening is provided in a part of a cylindrical portion of the airflow rectification means.