JP2000064114A - Nozzle device for spinning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a spinning nozzle device having a simple structure, capable of being easily produced, and not causing a leak by fitting a ceramic nozzle chip into a metal base and subsequently filling the space therebetween with a metal brazing material. SOLUTION: This spinning nozzle device 10 is obtained by inserting a ceramic nozzle chip 17 into the fitting hole 13 of a metal base 11 and subsequently filling a 0.1-0.2 mm wide space with a metal brazing material 24. A metal base 11 has the fitting hole 13 which has a step 14 at the center, whose base inside portion 15 is a cylinder having a large diameter and whose outside portion 16 is a cylinder having a small diameter. The ceramic nozzle chip 17 has a step 19 at the center, a cylinder having a large diameter in a base inside portion 20, and a cylinder having a small diameter in a base outside portion 21. The 0.1-0.2 mm wide space is formed between a rough surface 22 formed on the outer circumferential surface of the nozzle chip 17 and the inner circumferential surface of the fitting hole 13. The metal brazing material 24 has a larger thermal expansion coefficient than those of both the metal base 11 and the nozzle chip 17, and has a small elastic modulus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinning nozzle device used for drawing a liquid material to form fibers in the production of chemical fibers.

[0002]

The conventional spinning nozzle device has an integral structure in which a nozzle hole is formed in a metal base such as stainless steel.

In this conventional spinning nozzle device, since the nozzle hole is made of metal having good wettability with the fiber material, the fiber material adheres to the periphery of the outer surface of the nozzle when the nozzle is continuously used,
It happens that this carbonizes and cuts the drawn fibers. In order to prevent this, it is necessary to perform wiping every 4 to 8 hours. This wiping work not only temporarily stops the spinning work but also interferes with the work of other processes connected to each other, so that the production efficiency is significantly reduced. Therefore, it is strongly desired to extend the wiping cycle.

Further, since the nozzle hole is worn out, it is also desired to extend its life.

As a means to meet these demands, it has been considered to use ceramics instead of metals. This is because the fibrous material does not easily adhere to the ceramic, so that the wiping cycle can be extended and the wear resistance is excellent.

However, if the entire nozzle device is made of ceramic, the strength is insufficient, and there is a problem such as leakage due to a difference in the coefficient of thermal expansion at the portion where the nozzle device is attached to the spinning device, which makes practical use difficult.

Therefore, it is considered that only the nozzle hole portion is made of ceramic. The configuration proposed so far is to fit a ceramic nozzle tip to the base,
A soft metal gasket is interposed between the joints and is held by the holder.

Since the spinning nozzle device has a large number of nozzle holes in one base, it is difficult to press each nozzle tip uniformly and satisfactorily with this structure, and therefore it is difficult to manufacture, and There is an inconvenience that leakage is likely to occur.

An object of the present invention is to eliminate such inconveniences, and to realize a spinning nozzle device which uses a ceramic nozzle tip, has a simpler structure, is easy to manufacture, and does not cause leakage. It is a thing.

[0010]

According to the present invention, a nozzle tip is fitted to a metal base, a rough surface is formed on the outer peripheral surface of the nozzle tip, and a metal brazing agent is filled in a gap between the base and the base. .

To manufacture this nozzle device, it suffices to simply fit the roughened nozzle tip on the base and pour the metal brazing agent melted by heat into the gap, which is extremely easy.

Further, according to the trial experiment, no leakage occurred.

The reason for this is not clear, but
Part of it is explained by the higher thermal expansion coefficient of the metal brazing material than that of the base. That is, since the coefficient of thermal expansion of the ceramic nozzle tip is smaller than the base,
The gap expands due to the high temperature (about 300 degrees Celsius) during operation, but this can be offset by the large thermal expansion of the metal brazing agent. In addition, since the size of the gap is small, the gap is not completely offset, and the offset effect is limited to a part.

Further, since the ceramic nozzle tip has a rough surface, the wettability of the metal brazing agent to the ceramic is generally poor, but the joining of the two is reliable and leakage is unlikely to occur. Can also be considered.
In addition, when an experiment was carried out in the case where this rough surface was omitted, a leak came to occur.

Furthermore, since the metal brazing agent is soft and has a low elastic modulus, when the pressurized fibrous material flows out from the nozzle hole and deforms so as to expand the nozzle tip, it becomes a hard and hard to deform base. It is considered that they are deformed between the two and act to fill the gap better. Probably, it is considered that the above-mentioned respective actions cooperate to prevent the leakage satisfactorily.

[0016]

More specifically, the spinning nozzle device of the present invention is made of a metal base, a fitting hole formed in the base and having a large diameter inside the base, and made of ceramic. A nozzle tip having a nozzle hole, which is inserted into the fitting hole from the inside of the base and locked, a rough surface formed on the outer peripheral surface of the nozzle tip, and the rough surface and the fitting hole. It is configured to include a gap formed between the peripheral surface and a metal brazing agent filled in the gap.

As the material of the base, stainless steel similar to the conventional one can be used. For example, SUS304 or SU.
S316 is used.

The material of the nozzle tip is not particularly limited, and various ceramics can be used, such as alumina type and zirconia type.

The size of the rough surface may be about 1 to 10 S, preferably about 2 to 6 S, and a good result can be obtained at 3 to 5 S.

The width of the gap should not be too small in order to obtain the effect of the metal brazing agent as described above, but is at least 0.0.
About 5 mm is sufficient, and it is not necessary that the size is large, and 0.5 mm or less is sufficient. For manufacturing convenience, it is desirable that the thickness is approximately 0.1 to 0.2 mm.

As the metal brazing agent, an ordinary copper type one is suitable, and a silver type one can also be used. In addition, any material having a larger coefficient of thermal expansion and a smaller elastic modulus than both the base and the nozzle tip may be used.

The structure of the nozzle tip portion is arbitrary as long as the nozzle tip can be fitted into the base from the inner surface side of the base, but the fitting hole of the base has a step in the central portion and the inner portion of the base is large. The outer diameter of the nozzle is small and the outer diameter of the nozzle tip is small. The nozzle tip has a step at the center. The inner diameter of the base is large and the diameter of the outer diameter is small. A structure in which a gap is formed between the inner side portion of the base and the inner side portion of the base of the nozzle tip is practical.

[0023]

EXAMPLES Hereinafter, examples illustrating the present invention will be specifically described.

In this spinning nozzle device 10, the base 11 is made of stainless steel (SUS304 or SUS31).
6) and has a disk shape as a whole, and an edge 12 for attachment to a spinning device is formed around the disk.

A large number of fitting holes 13, ... Are formed in the base 11. Each of the fitting holes 13 has a step 14 at the center, and the inner surface (upper side in FIGS. 2 and 3) portion 15 of the base has a large-diameter tubular shape, and the outer portion 16 has a small-diameter tubular shape. . The diameter of the base inner portion 15 is, for example,
It is about 4 mm.

The nozzle tips 17, ... Are made of alumina ceramics, and have nozzle holes 18 ,.
Have respectively. Each nozzle tip 17 has a step 19 in the central portion, and the base inner surface portion 20 has a large-diameter tubular shape,
The outer portion 21 has a small-diameter tubular shape, and when it is fitted into the fitting hole 13 from the inner surface side of the base, it is locked by the steps 14 and 19. A rough surface 22 is formed on the outer peripheral surface of the base inner surface portion 20 of the nozzle tip. The roughness of this rough surface is 4
It is about S.

A gap 23 is formed between the base inner surface portion 15 of the fitting hole 13 and the base inner surface portion 20 of the nozzle tip 17 and is filled with a copper brazing agent 24. Specifically, a method is used in which the nozzle tip 17 is fitted in the fitting hole 13 and then the melted wax is poured. The width of the gap 23 is 0.1 to 0.2 mm.

When this spinning nozzle device 10 was actually used, no leakage occurred, and the wiping cycle could be set to be several times, which is several times that of the conventional one made of metal, about 24 to 48 hours.

[0029]

As described above, the spinning nozzle device of the present invention has an extremely simple structure, and since the nozzle tip is simply fitted into the base and fixed with the metal brazing agent, it can be manufactured easily and uniformly. can do. Further, by forming a rough surface on the ceramic nozzle tip, it is possible to completely prevent leakage. Further, since the base is made of the same metal as the conventional one, the strength as a whole does not decrease, and since the nozzle tip is made of ceramic, a long wiping cycle and excellent durability can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a front sectional view of the same example.

FIG. 3 is an enlarged view of the nozzle tip portion of 1 in the previous figure.

[Explanation of symbols]

10 ... Spinning nozzle device, 11 ... Base, 12 ... Edge, 1
3 ... Fitting hole, 14 ... Step, 15 ... Base inner part, 16 ...
Base outer part, 17 ... Nozzle tip, 18 ... Nozzle hole, 19 ... Step, 20 ... Base inner part, 21 ... Base outer part, 22 ... Rough surface, 23 ... Gap, 24 ... Waxing agent.

Claims (4)

[Claims] 1. A base made of metal, a fitting hole formed in the base and having a large diameter inside the base, and made of ceramic, having a nozzle hole, and inserted into the fitting hole from the inside of the base. And the nozzle tip that is locked by the nozzle tip, a rough surface formed on the outer peripheral surface of the nozzle tip, and a gap formed between the rough surface and the inner peripheral surface of the fitting hole. A spinning nozzle device comprising a metal brazing agent to be filled. 2. The spinning nozzle device according to claim 1, wherein the gap has a width of 0.1 to 0.2 mm. 3. The spinning nozzle device according to claim 1, wherein the metal brazing agent has a larger coefficient of thermal expansion and a smaller elastic modulus than both the base and the nozzle tip. 4. The nozzle according to claim 1, wherein the fitting hole of the base has a step in the central portion, the inner portion of the base has a large diameter tubular shape, and the outer portion has a small diameter tubular shape. The tip has a step in the central part, the inner part of the base has a large-diameter cylindrical shape, and the outer part has a small-diameter cylindrical shape, and between the base inner part of the fitting hole and the base inner part of the nozzle tip A spinning nozzle device in which a gap is formed.