JP2570259Y2 - Sealing device under spinneret - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] The present invention is to prevent the generation of foreign substances such as carbides on the spinneret surface.
The present invention relates to a device for sealing a base surface by flowing an inert gas such as steam.

[0002]

2. Description of the Related Art Generally, in a spinning apparatus, for example, a melt spinning apparatus for synthetic fibers or the like, when a polymer containing a monomer such as a polyamide is melt-spun, the vapor of the monomer evaporates in the atmosphere as the polymer is spun and the high temperature. Touch the base surface of the
It adheres to become carbide and grows firmly. In particular, when the carbide generated around the die hole grows to a certain size, it inhibits the discharge of the molten polymer from the die hole. It deteriorates the process, leading to process failure and poor quality.

[0003] For this reason, various methods of flowing an inert gas under a die have been proposed, but they are not yet satisfactory, and the suction and removal of the generated monomer cannot be performed smoothly. There was a problem that it was difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks in the prior art, and it is necessary to seal the base face with a small amount of inert gas (including steam). Another object of the present invention is to provide an apparatus capable of efficiently recovering a monomer.

[0005]

That is, the present invention is provided between a spin block and a cooling device for a spun yarn, and a device for flowing an inert gas under a spinneret.
The upper chamber, which is divided into two stages by a separation plate and has a lower chamber, has a rectangular cross section composed of a rectangular section, and the upper chamber is connected to a supply pipe connected to a source of inert gas to supply inert gas. The lower chamber is connected to a suction pipe connected to the recovery device to form a suction / discharge chamber for monomer, and the upper and lower chambers are enclosed in a frustoconical shape at the lower end and parallel to the lower surface of the base at the upper end. An inert gas outlet comprising a guide body having a flange protruding to the vicinity of the outer peripheral circle of the spun single fiber bundle is connected to a suction port for monomers and the like, and the inner wall surface of the lower chamber is heated to a predetermined temperature. A sealing device below a spinneret, which is provided with a heater.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention, and FIG.
FIG.

In the drawing, reference numeral 2 denotes a spinneret pack inserted into a spin block 1, a spinneret 3 is attached to the lower end of the spinneret pack 2, and a molten polymer is discharged from a spinning hole 4 to form a yarn Y. I do. Immediately below the spin block 1 (cap pack 2), a cap sealing device 7 according to the present invention is provided between a heat insulating plate 5 and a cooling device 6 disposed on the lower surface of the spin block 1.

That is, the apparatus 7 is divided into two upper and lower stages by a separating plate 8, and is formed of a ring-shaped body having a rectangular cross section composed of two lower chambers 9, 10. The upper chamber 9 is formed of an inert gas. The lower chamber 10 forms a suction / discharge chamber for monomer, and the upper chamber 9 has a header 18a connected to a conduit 20 connected to a source of inert gas and a supply pipe 18b branched from the header 18a. The nozzle 18 is connected, and the lower chamber 10 is connected to a suction nozzle 19 similar to the supply nozzle, which is connected to a conduit 21 connected to the recovery device.

The lower and upper chambers 9 and 10 (or the protruding edges of the lower ends) respectively surround the inside in the shape of a truncated cone and at the upper end in the horizontal direction (parallel to the lower surface of the pack) the outer circumferential circle of the spun single fiber y. An inert gas outlet 11 including guide bodies 11a and 12a having flanges 11b and 12b projecting to the vicinity, and a suction port 12 for monomers and the like are provided in series.
Dispersion rings 13 and 14 for equalizing blowing and suction are provided inside these chambers.

The dispersing ring 13 comprises an upper chamber and three annular chambers 9.
a, 9b, 9c partitioning plates 13a, 13b, 13
c, and distributed supply holes 15 are formed in the partition plate 13a at both sides at an angle of approximately 90 ° with respect to the inert gas supply nozzle, and the partition plates 13b and 13c are formed over the entire peripheral surface. Small holes 16 and 17 for dispersion are provided. The dispersion ring 14 has a similar structure.

Further, a heater 22 is provided on the upper and lower surfaces of the lower chamber 10 (the inner surface or the entire outer surface may be provided) so that the suction monomer does not adhere to the wall surface. In this case, it is preferable that the suction nozzle 19 is provided with a heating means as needed.

Although an example in which the upper and lower chambers 9 and 10 are divided into three has been described, the invention is not limited to this, and the upper and lower chambers may be divided into two or four or more. . It is preferable to provide the dispersion supply holes 15 at both sides of the outermost partition plate at an angle of about 90 ° with respect to the inert gas supply nozzle in order to equalize the dispersion. The provided one can also be used.

In such an apparatus, the yarn Y spun from the spinneret 3 is cooled by the cooling device 6 and wound up through a spinning tube or the like. The gas is dispersed and rectified in the upper chamber 9 of the sealing device, flows along the lower surface of the die 3 from the entire periphery of the outlet 11, and seals and protects the surface of the die from monomer contacted during spinning. I have.

For this reason, the growth of the monomer and the like fixed to the die surface is suppressed, and stable spinning is performed for a long period of time.

A part of the inert gas passes through the single fiber bundle of the yarn Y, reverses from the center thereof, crosses or flows down, and a part flows down accompanying the yarn Y. However, the uniform suction force from almost the entire circumference from the lower chamber suction port 12 causes a large part of the air to be sucked and sucked together with the monomer. A part of the cooling air blown out from the cooling device 6 rises by the suction flow, effectively cools the spun yarn Y, and is sucked into the suction port 12.

In order to make this cooling effective, the flange 1 of the lower chamber
2b is preferably a size that makes it as close as possible to the spun yarn Y.

The inert gas outlet 11 (the position of the flange 11b) is preferably disposed at a position 5 to 10 mm below the die surface so as to be substantially parallel to the die surface. Preferably, it is as close as possible to the strip. Normally, since the base surface is retracted above the spin block surface, the inclined portions of the guides 11a and 12a are formed in a truncated cone shape. This is preferable from the viewpoint of smoothing the fluid flow distribution.

A fluid such as an inert gas or a cooling gas containing monomer sucked into the suction port 12 is sent to a recovery device or the like through a suction nozzle 19, and the lower chamber 10 is heated by a heater 22 to, for example, 90 to 120. The temperature is controlled to be ° C. and adjusted so that the fixing substance such as a monomer does not solidify, so that the fixing substance does not grow on the inner wall surface and cause trouble.

Although the flow rate of the inert gas varies depending on the conditions, it is usually 5 to 10 Nm ³ / HR, and the suction amount is 1 to ³ Nm ³ / min.
However, the present invention is not limited to this.

[0020]

As described above, according to the present invention, it is possible to prevent the adhesion of monomers and the generation of carbides on the die surface, and to stably obtain a high-quality product for a long period of time. This has a very remarkable effect that it becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line XX of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Spin block 2 Spin pack 3 Spinneret 5 Lower main body 6 Cooling device 8 Separation plate 9 Upper chamber 10 Lower chamber 11 Outlet 11a Guide 11b Flange 12 Suction port 12a Guide 12b Flange 13 Dispersion ring 14 Dispersion ring 22 Heater

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takahiro Ishimoto 77, Kitayoshida-cho, Matsuyama-shi, Ehime Teijin Co., Ltd.

Claims (2)

(57) [Scope of request for utility model registration] 1. A device installed between a spin block and a cooling device for a spun yarn to flow an inert gas below a spinneret. The upper chamber is connected to a supply pipe connected to a source of the inert gas, the upper chamber is connected to a supply pipe for the inert gas, and the lower chamber is connected to a suction pipe connected to the recovery device. Connected to form a monomer suction and discharge chamber,
At the lower end of the upper chamber and at the lower end of the lower chamber, an inert gas outlet comprising a guide body having a flange surrounding the inside in a truncated cone shape and projecting to the vicinity of the outer circumference of the spun single fiber bundle in a direction parallel to the lower surface of the base at the upper end. A sealing device under a spinneret, wherein a suction port for a monomer or the like is continuously provided, and a heater for heating an inner wall surface of the lower chamber to a predetermined temperature is provided. 2. The upper and lower chambers are formed by at least two partition plates.
Divided into two annular chambers, the outermost chamber partition plate is provided with dispersed supply holes at both sides at an angle of approximately 90 ° to the supply pipe, and the other partition plates are provided with small holes over the entire peripheral surface. The sealing device under a spinneret according to claim 1, wherein