JP2568113Y2 - Spinneret - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinneret used for spinning synthetic fibers.

[0002]

2. Description of the Related Art Spinnerets used for spinning synthetic fibers are:
As shown in FIG. 3, a large number of inlet holes 11 and spinning holes 12 communicating with the inlet holes 11 are formed in a disk-shaped base body 10. For example, in the case of melt spinning, a molten stock solution is spun. By spinning from the hole 12, a synthetic fiber having a predetermined shape and thickness has been obtained. Also, during use, carbide of the molten stock solution adheres to the lower surface 13 on the side of the spinning hole 12 and causes thread breakage. I was working.

As the material of the base body 10, a metal material such as stainless steel, ceramics, cermet, cemented carbide, or the like has been used. Further, as shown in FIG. 4, only the vicinity of the introduction hole 11 and the spinning hole 12 is a nozzle piece 14 of ceramics, cermet, cemented carbide, or the like, and the nozzle piece 14 is attached to a metal base body 10. (Japanese Patent Laid-Open No. 58-76512)
Reference).

[0004]

However, as shown in FIG. 3, the spinneret 10 integrally formed of a metal material such as stainless steel easily adheres the carbide of the undiluted solution, and requires a cleaning operation in a short period of time, as shown in FIG. In addition, there is a problem that the life is short due to low wear resistance. Also, ceramics,
A spinneret integrally formed of a hard material such as a cermet or a cemented carbide is difficult to form a large number of spinning holes 12 with high accuracy, and has a very low production yield and a high cost. there were.

Accordingly, as shown in FIG. 4, a nozzle piece 1 made of ceramics, cermet, cemented carbide, etc.
4 is attached to a metal base body 10 so that a large number of spinning holes 12 can be accurately formed.
The production yield was good and a spinneret with low cost could be obtained. However, in this case, since the thermal expansion coefficient of the nozzle piece 14 is smaller than that of the base body 10, when the nozzle piece 14 is used at a high temperature, the lower surface 14 of the nozzle piece 14 on the spinning hole 12 side is used.
a is depressed from the lower surface 13 of the base body 10, and there is a problem that the carbide adhered to the lower surface 14 a of the nozzle piece 14 cannot be removed when cleaning the carbide of the molten stock solution. .

[0006]

In view of the above, the present invention provides:
A nozzle piece is inserted into and attached to the mounting hole of the spinneret main body to form a spinneret. At a working temperature, a step between the lower surface of the nozzle piece on the spinning hole side and the lower surface of the spinneret body is -10.
Each of the nozzle piece and the base body is made of a material having a different coefficient of thermal expansion so as to be 0 μm. In addition, the step in the present invention is a step of the lower surface of the nozzle piece with respect to the lower surface of the base body, and a negative value of the step indicates that the lower surface of the nozzle piece is depressed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

The spinneret shown in FIG. 1 (A) has a nozzle piece 1 made of cermet arranged and connected in a mounting hole 2a formed in a base body 2 made of stainless steel. The nozzle piece 1 has an introduction hole 1a and a spinning hole 1b, and is prevented from coming off by a step 1d.
Further, a metal ring 4 made of a soft material such as copper is provided between the nozzle piece 1 and the base body 2 on the introduction hole 1a side,
Further, a metal ring 3 made of a hard material such as stainless steel is press-fitted, and the nozzle piece 1 and the base body 2 are connected. Since the metal rings 3 and 4 are press-fitted in this manner, the metal ring 4 made of a soft material is
Because it is in close contact with the gap between the die body 2 and the base body 2, it has excellent sealing resistance and is extremely easy to manufacture.

In the spinneret, as shown in FIG. 1 (A), the lower surface 1c of the nozzle piece 1 protrudes from the lower surface 2b of the nozzle body 2 on the spinning hole 1b side, as shown in a normal temperature state.
A step having a height d is formed. Therefore, 3
When the temperature rises to about 00 ° C., the base body 2 made of metal expands more thermally than the nozzle piece 1 made of cermet, and as a result, as shown in FIG. The lower surface 1b is depressed by the minute step d '. Therefore, it is possible to completely remove the carbide in the molten stock solution during the cleaning operation.

Next, another embodiment of the present invention will be described.

The spinneret shown in FIG. 2A is provided in the mounting hole 2a of the nozzle body 2 made of Kovar similarly to the above embodiment.
A nozzle piece 1 made of cermet and having no step is inserted, and the space between the two is brazed by a brazing material 5 such as silver brazing on the introduction hole 1a side. Also in this case, since the brazing material 5 comes into close contact with the gap between the nozzle piece 1 and the base body 2, a bonding structure having excellent sealing resistance can be obtained.

In this embodiment, the base body 2 made of Kovar is more than the nozzle piece 1 made of cermet.
Has a smaller coefficient of thermal expansion, so that the nozzle piece 1 side expands significantly when used at a high temperature. Therefore, contrary to the above embodiment, as shown in FIG.
On the side, the lower surface 1c of the nozzle piece 1 is recessed from the lower surface 2b of the base body 2, and a step having a height d is formed between the two. Therefore, as shown in FIG. 2 (B), when the temperature rises during use, the step d ′ between the two becomes extremely small, and the cleaning operation becomes easy.

In the above-described embodiment, the material of the nozzle piece 1 is a cermet. However, a ceramic such as alumina, zirconia, silicon carbide, silicon nitride, or a cemented carbide may be used. Can be.
The cermet is a carbide, nitride or carbonitride (TiC, TiN, T
It is a heat-resistant sintered body having conductivity of at least 50% by weight (iCN, NbC, TaC, etc.) and an iron group metal (Fe, Ni, Co).

The base body 2 is made of stainless steel,
A metal such as Kovar, 42Ni alloy, Incoloy is used.

Further, the coupling structure between the nozzle piece 1 and the base body 2 is not limited to the above embodiment, but may be various, such as a combination of a metal ring and brazing. Further, the step d between the lower surface 1c of the nozzle piece 1 and the lower surface 2b of the base body 2 may be appropriately set according to the difference in the coefficient of thermal expansion between the nozzle piece 1 and the base body 2, the operating temperature, and the dimensions of the product. I just need. Although only one nozzle piece 1 is shown in FIGS. 1 and 2, many nozzle pieces 1 are actually connected to one base body 2.

Experimental Example 1 As a spinneret shown in FIG.

The nozzle piece 1 has a diameter of 6 mm and a length of 2
A cermet having 0 mm and a height of step 1c of 3 mm and containing TiC and TiN as main components was used, and stainless steel (SUS630) was used as the base body 2. The two were joined using a metal ring 3 made of a 42Ni alloy and a metal ring 4 made of copper. Furthermore, the lower surface 1 of the nozzle piece 1 at normal temperature
The step d of c was 15 ± 5 μm to constitute the spinneret of the present invention.

The method of manufacturing the spinneret according to the present invention is as follows. First, the nozzle piece 1
After inserting a metal ring 4 made of copper,
At this time, no step is formed on the spinning hole 1b side. Thereafter, a metal ring 3 made of a 42Ni alloy is press-fitted in a state where a jig having a step of 15 μm is set on the spinning hole 1b side, whereby a step d of 15 ± 5 μm can be provided. Alternatively, the jig may be set from the time of press-fitting the metal ring 4 made of copper.

On the other hand, as a comparative example, one having a step d at room temperature was prepared. For these inventive examples and comparative examples, spinnerets each having 34 nozzle pieces were prototyped, and using these spinnerets,
Melt spinning was performed at 280 ° C., and a step d ′ between the lower surface 1c of the nozzle piece 1 and the lower surface 2b of the die body 2 at this temperature was examined, and at the same time, the cleaning workability was compared.

As shown in Table 1, in Comparative Examples 1 and 2, the step d ′ was −23 to −10 μm, and the lower surface 1c of the nozzle piece 1 was greatly depressed. It was not enough. In Comparative Example 3, the step d ′ was 0 to 5 μm and the lower surface 1c of the nozzle piece 1 was protruded, so that the cleaning workability was poor. On the other hand, in the embodiment of the present invention, since the step d ′ is as small as −6 to 0 μm, it is possible to remove the deposits on the nozzle portion and the cleaning workability is excellent.

Obviously from the experimental results, in the spinneret of the present invention, the step d 'between the lower surface 1c of the nozzle piece 1 and the lower surface 2b of the nozzle body 2 at the operating temperature is important. If it is large, the nozzle piece 1 will protrude, and the cleaning operation cannot be performed smoothly. On the other hand, when the step d ′ is smaller than −10 μm,
The depression of the nozzle piece 1 is too large, so that it is not possible to completely remove the deposit during cleaning. Therefore, the one in which the step d ′ at the operating temperature is -10 to 0 μm was good.

[0022]

[Table 1]

EXPERIMENTAL EXAMPLE 2 Next, an experiment similar to Experimental Example 1 was carried out by changing the materials of the nozzle piece 1 and the base body 2 in various ways. The results are as shown in Table 2. As shown in this table, if the materials of the nozzle piece 1 and the base body 2 are different, the optimum value of the step d is also different, and this value can be obtained by calculation based on the difference in thermal expansion, the operating temperature, and the product dimensions. .

[0024]

[Table 2]

[0025]

As described above, according to the present invention, the nozzle piece is inserted into and attached to the mounting hole of the die body to form the spinning die, and the lower surface of the nozzle piece on the spinning hole side and the die at the operating temperature. Since each of the nozzle piece and the base body is made of a material having a different coefficient of thermal expansion so that the step with respect to the lower surface of the main body is -10 to 0 μm, the cleaning work is performed smoothly because the nozzle piece does not protrude during use. Since the depression of the nozzle piece is small, it is possible to easily and reliably remove the deposits on the nozzle portion.

Further, according to the present invention, since the spinning holes are made of ceramics, cermet, and cemented carbide, there is little adhesion and wear of carbides of the molten stock solution and a long life can be obtained. further,
Because of the structure in which the nozzle piece is attached, a spinneret having many features such as good yield at the time of manufacture and low cost can be provided.

[Brief description of the drawings]

FIG. 1 shows a spinneret according to an embodiment of the present invention;
3 is a partial cross-sectional view at normal temperature, and FIG.

FIG. 2 shows another embodiment of the present invention, wherein (A) is a partial cross-sectional view at normal temperature and (B) is a partial cross-sectional view at operating temperature.

FIG. 3 is a partially broken side view showing a conventional spinneret.

FIG. 4 is a partial sectional view showing a conventional spinneret.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Nozzle piece 1a ... Introducing hole 1b ... Spinning hole 1c ... Lower surface 2 ... Base body 2a ... Mounting hole 2b ... Lower surface 3 ... Metal ring 4 ...・ Metal ring 5 ... brazing material

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-76512 (JP, A) JP-A-62-57905 (JP, A) JP-A-58-76514 (JP, A) JP-A-62-76514 125007 (JP, A) JP-A-61-97412 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A spinneret comprising a nozzle piece having an introduction hole and a spinning hole communicating therewith inserted into a mounting hole of a mouthpiece body, and the introduction hole side of the nozzle piece fixed to the mouthpiece body. The nozzle piece and the base body are each made of a material having a different coefficient of thermal expansion, and the nozzle piece at room temperature is used so that the lower surface of the nozzle body on the spinning hole side and the lower surface of the base body at the operating temperature are substantially the same. A spinneret having a step formed on a lower surface and a lower surface of a spinneret main body.