JPS6145173Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the structure of a spinneret union, particularly a cap-type spinneret union capable of withstanding high pressure.

[Prior art]

In order to improve productivity in fiber manufacturing, increasing the number of holes in the spindle and increasing the spinning speed are common methods, but the spindles used in this case have the following problems.

That is, a cap-type spinneret 1 as shown in FIG. 1 is used as a spinneret used for normal wet spinning or wet-dry spinning, and spinning holes are formed on the spinneret surface 1a of the spinneret 1 with a desired hole diameter and number of holes. 1b is bored, and a collar 1d is provided at the end of the cylindrical portion 1c around the mouthpiece surface 1a. The mouthpiece surface 1 is usually assembled as a mouthpiece union as shown in FIG.
The spindle union has a spindle 1 supported on a pedestal 2 by a collar 1d, and a perforated plate 3 on the top of the spinneret 1 for distributing the spinning stock solution to each spinning hole 1b, and an upper part of the perforated plate 3. A material 4 (usually a combination of materials and wire mesh) for removing foreign matter from the spinning stock solution is placed at the top, and the upper part of this material is covered with a holding plate 5 (6: tightening bolt). ing.

When spinning using such a spinneret union, due to the high pressure at the start, etc., the spindle cylindrical portion 1c collapses inward as shown in FIGS. 3 and 4, and wrinkles 1e occur around the spinneret surface 1a. Another problem is that the spinning holes 1b formed in the wrinkles 1e significantly plastically deform the shape of the holes. In other words, increasing the number of holes in the spindle inevitably results in an increase in the diameter of the spinneret, and as a result, the spinneret surface 1a cannot withstand the load from the spinning solution.
As a result, distortion occurs in the spinneret 1, causing plastic deformation particularly in the spinning holes 1b at the wrinkles 1e.

On the other hand, when the spinning speed is increased, the pressure increases due to the increase in the amount of the spinning dope, resulting in plastic deformation of the spinneret 1, as in the case of increasing the number of holes in the spinneret.

As a solution to such plastic deformation of the spinning nozzle, it has been known to increase the wall thickness of the nozzle or to make the nozzle surface spherical. In this case, apart from increasing the material cost, the hole pitch had to be increased due to problems in drilling technology. As a result, the diameter of the mouthpiece becomes large, which significantly limits the ability to increase the number of holes in the mouthpiece in order to improve productivity. On the other hand, by making the spindle surface spherical, the pressure resistance of the spindle surface is significantly improved by designing the spherical radius to be small; The behavior is slightly different, and unevenness occurs in the spinning performance or yarn quality. For this reason, there is a natural limit to the spherical radius and number of holes of the spinneret for stable spinning, and in particular, the spherical radius cannot be made too small, making it impractical as a spinning spinneret for improving productivity.

[Problem that the invention attempts to solve]

The purpose of the present invention is to eliminate the drawbacks of the prior art in the spinning nozzle union described above, and to provide a nozzle union with an improved structure for increasing the pressure resistance of the conventional spinning nozzle without changing its specifications. There is something to do.

[Means for solving problems]

The present invention provides a spinning spinneret union composed of a cap-type spinneret, a perforated plate, a material, a holder for these, etc., in which a reinforcing member for the cylindrical portion of the cap-type spinneret made of stainless steel is provided integrally with the perforated plate; The present invention relates to a spinneret union in which the reinforcing member is fitted so as to be in contact with the inner wall surface of the cylindrical portion of the cap type die.

Hereinafter, the present invention will be specifically explained based on the drawings.

FIG. 5 is a schematic cross-sectional view showing an example of the spinneret union according to the present invention, and FIGS. 6 to 8 are schematic cross-sectional views showing other embodiments of the spinneret and perforated plate in the spinneret union according to the present invention. It is.

In the drawing, the spinning die union includes a cap-type spinneret 1 supported by a pedestal 2.

A perforated plate 3 is disposed on the upper part of the cap 1, and a reinforcing member 7 for the cap-type cap cylindrical portion 1c is provided integrally with the perforated plate 3. The reinforcing member 7 is fitted so as to be in contact with the inner wall surface of the cylindrical portion 1c of the cap type mouthpiece.

Further, the upper side of the perforated plate 3 is covered with a material 4, and the upper side thereof is further covered with a presser plate 5.

The feature of the present invention is that the reinforcing member 7 of the cylindrical part 1c of the cap type nozzle is provided integrally with the perforated plate disposed on the upper part of the cap type nozzle in the spinning nozzle union as described above. In this case, the cap is inserted so that it touches the inner wall surface, and the cap has the same specifications as before.
For example, even if the diameter of the spinneret is simply increased to increase the number of holes, plastic deformation due to spinning can be almost completely prevented.

That is, regarding the plastic deformation of the spinneret due to spinning, the spinneret surface 1a may swell, or the spinneret cylindrical portion 1c may
Those skilled in the art have often experienced folding inward and wrinkles on the outer periphery of the mouthpiece surface 1a (see Figures 3 and 4). As a result of various studies on preventive measures, we found that the most convenient and effective solution for cap-type ferrules is to prevent the cylindrical portion 1c from collapsing inward.
As a specific means, a reinforcing member 7 of the cylindrical part 1c of the cap type spinneret is provided integrally with a perforated plate disposed on the upper part of the cap type spinneret in the spinning spinneret union, and the reinforcing member 7 is attached to the inner wall surface of the cylindrical part of the cap type spinneret. This prevents the cylindrical portion 1c of the spinneret from collapsing inward when the spinneret 1 receives high pressure from the spinning solution during spinning, and the plasticity of the spinneret is reduced under normal spinning conditions. Deformation, especially wrinkles 1e on the spinneret surface and deformation of the spinning holes 1b, can be almost completely prevented.

The reinforcing member 7 provided integrally with the perforated plate 3 for this purpose needs to sufficiently surround the inner wall surface of the cylindrical part 1c and have a certain degree of mechanical strength, and stainless steel is usually used as the material. .

In addition, it is important to finish the surface of the reinforcing member 7 smoothly so as not to damage the cap.
The surface finish is 12S or higher, and furthermore, for example
It is best to buff it with #300.

Further, by integrating the reinforcing member 7 with the perforated plate 3, assembly and disassembly of the base union are facilitated.

In addition, in the spinneret union of the present invention, the reinforcing member 7 is provided integrally with the perforated plate 3.
If all the holes are made only in the vertical direction as in the past (hereinafter referred to as straight holes 3a), the thick portion of the reinforcing member 7 cannot be bored, and the effective overarea of the material 4 on the perforated plate 3 is reduced. Therefore, it is preferable to eliminate the reduction in the effective overarea by making the perforations in the outer circumferential portion of the perforated plate 3 oblique holes 3a' extending from the outer circumference toward the center (see FIGS. 6 to 8). In addition, at this time, some of the holes in the perforated plate 3 are provided as diagonal holes 3a'' to sweep the inner wall surface of the reinforcing member 7 (sixth to
(See Figure 8), or by making the diagonal holes intersect without contacting each other, a streamline switching function is provided, and furthermore, in the perforated plate 3, the flow resistance between each hole for the spinning stock solution is uneven (mainly due to hole length). It is desirable to eliminate the problem (based on the difference) by appropriately adjusting the design of the hole diameter according to the hole length.

[Effect of idea]

As mentioned above, the spinning nozzle union of the present invention includes the reinforcing member 7 of the cylindrical part 1c of the cap-type nozzle integrally with the perforated plate disposed on the upper part of the cap-type nozzle, and the reinforcing member 7 is attached to the inner wall surface of the cylindrical part of the cap-type nozzle. By fitting the cap into contact with the cap, plastic deformation caused by a 30 to 50 percent increase in pressure can be almost completely prevented even with a cap of normal specifications. As a result, the spinning operation is stabilized, especially when spinning using a multi-hole spinneret, and the resulting spun yarn has excellent properties such as greatly reducing fiber spots and single yarn breakage (especially during the drawing process). be effective.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing an example of a normal cap type spinneret, Fig. 2 is a schematic sectional view showing an example of a conventional spinning spinneret union, and Figs. A schematic diagram showing plastic deformation of the spinneret after spinning at high pressure; FIG. 5 is a schematic cross-sectional view showing an example of the spinning spinneret union according to the present invention;
6 to 8 are schematic sectional views showing other embodiments of the spinneret and perforated plate in the spinneret union according to the present invention. Explanation of the symbols: 1: cap-type nozzle, 1a: nozzle surface, 1b: spinning hole, 1c: cylindrical part of the nozzle, 1d:
Brim, 1e: Wrinkle, 2: Rest, 3: Perforated plate, 3
a to 3a″: straight hole or oblique hole, 4: material, 5: holding plate, 7: reinforcing member.

Claims (1)

[Scope of utility model registration request] In a spinning spinneret union composed of a cap-type spinneret, a perforated plate, a material, a holder for these, etc., a reinforcing member made of a stainless steel material is provided for the cylindrical portion of the cap-type spinneret integrally with the perforated plate, and the reinforcing member is made of a stainless steel material. A spinning spinneret union comprising a member fitted into the cylindrical portion of the cap type spinneret so as to be in contact with the inner wall surface thereof.