JP2668849B2 - Manufacturing method of spinneret - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a process for the preparation <br/> spinning die, in particular, retention prevention in the die, a method of manufacturing a spinning die which attained the pressure loss reduction of the mouthpiece.

[0002]

2. Description of the Related Art A spinneret is usually formed by providing a number of spinning holes of a predetermined shape in a disk member made of steel, particularly stainless steel. When the cross section of the yarn to be spun is round, the spinning hole is formed as shown in FIGS. 10 and 11, for example, and a modified cross section (cross section other than round, for example, Y
In the case of a shape, a star, a cross, a triangle, etc.), the spinning holes are formed as shown in FIGS. 12 and 13, for example.

In FIGS. 10 and 12, 101 and 111
Shows a partial longitudinal section of a disk member constituting a spinneret, and a predetermined number of spinning holes 102 and 112 are formed in the disk members 101 and 111. The arrows indicate the flow direction of the molten fluid, for example, the molten synthetic resin. Hole 1 for spinning
02 and 112 are, in order from the upstream side, introduction portions 103 and 113 having a circular cross section and a tapered inner peripheral surface, and introduction hole portions 104 and 11 formed of straight holes having a circular cross section.
4. Constrained portions 105 and 115 each having a circular cross section and an inner peripheral surface formed as a tapered surface, and discharge holes 106 and 116 having the same cross section in the hole extending direction. In the case of a round cross-section yarn, the cross-sectional shape of the discharge hole portion 106 is formed in a circular shape as shown in FIG. 11, and in the case of a modified cross-section yarn, the cross section of the discharge hole portion 116 is, for example, as shown in FIG. As shown in FIG.

[0004] Of the spinning holes 102 and 112, the discharge holes 106 and 116, in particular, require extremely high finishing accuracy and have a hole diameter (hole maximum diameter) of 0.1 to 1.
The discharge holes 106 and 116 are usually formed by electric discharge machining because the diameter of the cross section of the hole is irregular, especially in the case of a modified spinneret for irregular cross section. That is, the aperture units 105 and 11
Up to 5, processing and finishing are performed by drilling, reaming, etc., and the discharge hole portions 106 and 116 are formed by electrical discharge machining.

[0005]

However, the conventional spinneret in which the spinning holes 102 and 112 are formed by the above-described processing method has the following problems. First, regarding the round-section thread spinneret shown in FIGS. 10 and 11, as shown in FIG. 10, since the vertical cross-section has a polygonal line shape, a smooth flow of the molten fluid is obtained especially at the bent portion. Is difficult to obtain, causing an increase in pressure loss, and in some cases, there is a possibility of local retention.

In the modified cross-section yarn spinnerets shown in FIGS. 12 and 13, such a problem becomes extremely large. That is, due to processing, a flat surface 117 is inevitably formed at the entrance of the discharge hole 116, that is, at the boundary between the discharge hole 116 and the throttle 115, and this flat surface 117 is formed by the discharge hole 116.
It remains as shown after processing. Since this flat surface 117 is a surface that is substantially orthogonal to the flow direction of the molten fluid, retention tends to occur in this portion and causes a large pressure loss.

If the retention occurs, it may cause a trouble in production such as breakage of the spun yarn or a problem in yarn quality. When the pressure loss increases, a higher pressure is required at the spinneret inlet, so that the spinneret portion and each component on the upstream side thereof need to have higher pressure resistance.

Further, in the above-described conventional processing method, since the discharge holes 106 and 116 have to be subjected to the electric discharge machining one by one, it takes a lot of time and labor to process them, and the spinning die becomes expensive. At the same time, due to variations in processing, there is a possibility that variations may occur in hole accuracy of the finished ejection hole portions 106 and 116. If this variation becomes large, problems and troubles will occur in the quality of the spun yarn.

An object of the present invention is to provide a method for producing a spinneret having spinning holes capable of substantially completely eliminating retention and suppressing pressure loss to an extremely low level. is there.

Another object of the present invention is to provide a method for producing a spinneret which can be easily manufactured at a low cost and which can facilitate the drilling and greatly reduce the drilling time.

[0011]

According to the present invention, there is provided a method of manufacturing a spinneret according to the present invention, comprising the steps of: introducing a molten fluid into an inlet; and introducing the molten fluid from the inlet. In the method for producing a spinning die having a large number of spinning holes each having a smaller diameter than the discharging holes, the spinning holes are connected to the outlets of the discharging holes as viewed in the flow direction of the molten fluid. At least a part of the inner surface is formed into a three-dimensional curved surface in which the shape line of the discharge hole portion inlet does not substantially appear , and each spinning hole is
The ceramic part is formed in a ceramic member.
The material is fixed in each mounting hole drilled in the base body.
And spinning holes in each ceramic member
Has a curved surface portion corresponding to the three-dimensional curved surface at the constant outer peripheral portion
A pin-shaped mold is manufactured, and ceramic is placed on the pin-shaped mold.
Molding into a predetermined member shape and firing it
And a method characterized by being formed from

That is, the inner surface of the spinning hole, which is conventionally formed in a polygonal shape when viewed in the longitudinal section of the hole, is a smooth three-dimensional curved surface (curved in the longitudinal sectional shape) at least at the portion connected to the outlet of the discharge hole. The three-dimensional curved surface portion is smoothly connected to the discharge hole portion inlet so that the shape line of the discharge hole portion inlet does not substantially appear.

In this spinning die, each spinning hole is formed in each ceramic member, and each ceramic member is provided with a mounting hole formed in a spinneret body made of, for example, a metal disc member. Te <br/> by a Rukoto respectively fixed within, is actually and easily manufactured.

That is, the spinneret body and the spinning hole forming portion are made of members made of different materials, and the two are joined together. As the spinning hole forming member, a ceramic member is most suitable in terms of heat resistance, pressure resistance, and moldability. A pin-shaped molding die having a curved surface portion corresponding to the three-dimensional curved surface at a predetermined outer peripheral portion is manufactured, and ceramic powder is molded into a predetermined member shape (for example, injection molded) on the pin-shaped molding die, and then fired. By doing so, it is not necessary to perform electrical discharge machining of individual holes as in the past.
In a large amount, a ceramic member having a predetermined spinning hole shape can be easily obtained. If necessary, a modification process for improving the hole accuracy may be performed. A target spinning spinneret can be obtained by fixing the ceramic member manufactured in this way in each mounting hole, which is a main body of the spinneret, for example, formed by machining a metal disk member.

[0015]

In the method for producing a spinneret according to the present invention, the inner surface of the spinning hole, particularly the inner surface of the spinning hole which is narrowed down to a small diameter and reaches the inlet of the discharge hole, is formed into a smooth three-dimensional curved surface. However, since it is connected to the discharge hole smoothly so that the discharge hole inlet shape line does not appear, a bent portion as in the conventional structure or a flat surface orthogonal to the flow of the molten fluid is not formed, and there is a risk of retention. And the smooth flow significantly reduces pressure loss.

The present invention is, of course, also effective for a yarn for a round cross-section yarn, but an extremely remarkable effect can be obtained particularly when the invention is applied to a yarn for a cross-section yarn. That is, FIGS.
As shown in Fig. 3, there is no possibility of stagnation, and there is no flat surface immediately before the discharge hole that causes a large pressure loss. Despite being narrowed to a small diameter, the flow becomes extremely smooth and pressure loss is greatly reduced.
When each spinning hole is formed in each ceramic member,
Together, each of the ceramic members is
Fixed inside the mounting holes and inside each ceramic member
The spinning hole in the above three-dimensional curved surface at a predetermined outer peripheral portion
A pin-shaped mold having a corresponding curved surface is manufactured, and the
Mold the ceramic powder into a predetermined shape on the mold.
Since it is formed by firing it,
Use the same pin-shaped mold without relying on electric discharge machining
The ceramic member with the spinning hole
Easy and large-scale production for spinning
The base can be easily manufactured.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the method for producing a spinning die of the present invention will be described below with reference to the drawings. 1 to 4 are manufactured by the method according to the first embodiment of the present invention.
2 shows a spinning spinneret and shows a case where the present invention is applied to a modified cross-section yarn spinneret. In FIGS. 1 and 2, reference numeral 1 denotes the entire spinneret. Spinneret 1
Are fixed to the metal disc member 2 as the die body, a predetermined number (the number of spinning holes) of the metal disc member 2, and the mounting holes 3 formed in a predetermined arrangement. A ceramic member 5 having a spinning hole 4.

The material of the metal disc member 2 is not particularly limited, and the heat resistance and pressure resistance required for the spinneret are
Any material having corrosion resistance or the like may be used. Therefore, the stainless steel conventionally used for the spinneret can be used. Further, in this embodiment, the metal disc portion plate 2 is used as the die body, but the material of the die body is other material, for example, a ceramic member formed separately from the ceramic member 5 described below. You may comprise.

The material of the ceramic member 5 is not particularly limited, and a ceramic material containing alumina or zirconia can be applied. Above all, zirconia-based ceramics having high hardness and high rigidity are preferable.

This ceramic member 5 has a spinning hole 4 inside, and in this embodiment, the outer peripheral surface is formed in a stepped shape as shown in FIG. The mounting hole 3 formed in the metal disk member 2 has a fitting portion 3a with the ceramic member 5 formed at the center in the plate thickness direction, and upper and lower portions 3b,
Each of the holes 3c has a hole diameter larger than the outer diameter of the ceramic member 5. After each ceramic member 5 is fitted into the fitting portion 3a of each mounting hole 3, a heat-resistant inorganic material is formed in a gap formed between the outer peripheral surface of the ceramic member 5 and the mounting hole inner peripheral surfaces 3b and 3c. The adhesive 6 is filled and solidified .
By filling and solidifying the heat-resistant inorganic adhesive 6, the ceramic member 5 is firmly fixed in the mounting hole 3, and a gap that causes retention or the like is formed on the upper surface and the lower surface of the spinning die. Is prevented.

The heat-resistant inorganic adhesive 6 is composed of a mixture of an inorganic powder, for example, a glass powder or a ceramic powder, and a heat-resistant adhesive or a binder.
Solidification by heat treatment in a furnace (constant temperature bath, baking furnace, etc.)
Is done.

In this embodiment, the ceramic member 5 is fixed in the mounting hole 3 using the heat-resistant inorganic adhesive 6 as described above, but the present invention is not limited to this and may be fixed by another method. . For example, the mounting hole 3 is formed substantially in the same shape as the outer peripheral shape of the ceramic member 5 over substantially the entire length, and a method of press-fitting the ceramic member 5 or a metal disk member 2 as a base body is used. By heating and expanding the diameter of the mounting hole 3 by thermal expansion, and fixing the ceramic member 5 at room temperature or at the same temperature as the die body after fitting, by lowering the temperature of the disc member 2 and fixing. Etc. can also be adopted.

The spinning hole 4 formed in the ceramic member 5 is in this embodiment is formed in a shape shown in FIG. 3, FIG. 4
You. As shown in FIG. 3, the spinning hole 4 has a circular cross-section and an inner peripheral surface that introduces the molten fluid into the hole from an upstream side when viewed in the flow direction (arrow direction) of the molten fluid, for example, the molten synthetic resin. An introduction portion 7 formed on the tapered diaphragm surface, an introduction hole portion 8 connected to the introduction portion 7 and formed of a straight hole portion having a circular cross section,
A three-dimensional curved surface portion 9 connected to the introduction hole portion 8 and having a smooth three-dimensional curved surface with a diameter reduced toward the downstream side, and a straight hole having an irregular cross section connected to the three-dimensional curved surface portion 9 and discharging a molten fluid. The discharge hole portion 10 is formed of a portion .

The modified cross-sectional shape of the discharge hole portion 10 is Y-shaped in this embodiment, as shown in FIG. The surface shape of the three-dimensional curved surface portion 9 changes smoothly, and when the three-dimensional curved surface portion 9 is connected to the inlet 10a of the discharge hole portion 10, it is smooth so that the shape line of the inlet 10a of the discharge hole portion 10 does not substantially appear. Connected. In FIG. 3, each hole boundary is shown by a broken line for convenience of description, but these lines do not actually appear. In the present embodiment, the boundary between the three-dimensional curved surface portion 9 and the introduction hole 8 is also connected via a smooth curved surface, and no shape line appears at this portion. Further, in this embodiment, R is also given to the boundary between the introduction portion 7 and the introduction hole portion 8, and this portion also makes a smooth transition.

The irregular cross-sectional shape of the discharge hole portion 10 is not limited to the above-mentioned Y-shape, and any of the cross-sectional shapes used for known modified cross-sectional yarns, such as a star, a cross, and a triangle, can be adopted. In any cross-sectional shape, at least the introduction hole and the discharge hole may be smoothly connected by the three-dimensional curved surface so that the entrance shape line of the discharge hole does not appear.

The discharge hole portion 10 usually has a hole diameter (maximum diameter) of about 0.1 to 1.0 mm and a length of 0.1 to 1.
0 mm, and the introduction hole 8 has a hole diameter of 1.0 to 5.0 mm.
It is about 0 mm. Since the discharge hole portion 10 has an irregular cross section, its hole diameter is small, and accuracy is required, as described above, conventionally, only the electric discharge machining was used. But the present invention
In the above, a ceramic member 5 manufactured separately from the metal disk member 2 is used as a spinning hole 4 forming member , and the respective ceramic members 5 are formed in substantially the same process by the following method. It is easily and accurately manufactured in a short time .

A pin-shaped die having an outer peripheral shape substantially the same as the shape of the spinning hole 4 as described above is manufactured, and the pin-shaped die is used to mix ceramic powder (or a binder therein) around the die. It can be manufactured by molding (compression molding, injection molding, etc.) and finishing the details as necessary.

In the spinneret manufactured as described above, the molten fluid flowing from the introduction hole 8 into the discharge hole 10 flows along the three-dimensional curved surface portion 9. 3D curved surface 9
Is connected to the discharge hole portion 10 having a Y-shaped irregular cross section so smoothly that the shape line of the inlet 10a of the discharge hole portion 10 does not appear, so that the flow from the introduction hole portion 8 into the discharge hole portion 10 is also The flow becomes extremely smooth. In other words, it does not have a broken line like in the conventional shape,
Since the flat portion as shown in FIGS. 12 and 13 is not formed immediately above the discharge hole portion 10, there is no portion where there is a possibility of staying, and the smooth flow also significantly reduces the pressure loss.

Further, in this embodiment, the boundary between the introduction portion 7 and the introduction hole 8 and the boundary between the introduction hole 8 and the three-dimensional curved surface 9 are also smoothly connected. Even in these parts, a smooth flow state is achieved, and the pressure loss is further reduced.

Further, the ceramic member 5 having the spinning holes 4 is basically a discharge member separately from the metal disc member 2.
Since it is possible to easily and accurately produce a large amount without using a process , the spinning die 1 can be produced in a short time and at a low cost.

In the above embodiment, the length of the three-dimensional curved surface portion 9 is relatively short in the direction of flow of the molten fluid. However, the length may be changed as appropriate. For example, the three-dimensional curved surface portion 9 is formed from the central portion in the longitudinal direction of the introduction hole portion 8,
The three-dimensional curved surface portion 9 may be elongated and connected to the ejection hole portion 10.

Further, as shown in a modified example in FIG. 5, the discharge hole portion 1 from the inlet of the introduction hole portion (that is, from the outlet of the introduction portion 7).
The three-dimensional curved surface portion 11 may be formed over the entire length until reaching zero. Further, as shown in FIG. 6, another three-dimensional curved surface portion 12 extends from the entrance of the introduction portion, that is, from the entrance of the base to the discharge hole portion 10 over the entire length.
May be formed. In the examples shown in FIGS. 5 and 6, the cross-sectional shape from the inlet of the introduction hole portion and further from the inlet of the introduction portion is similar to that of the discharge hole portion, or a modified cross-sectional shape close to the similar shape. It may be. Furthermore, in each of the above examples, the shape line in the vertical cross section of the three-dimensional curved surface portion is formed to be a curve, but the shape line in the vertical cross section may be formed to be linear.

The length and curved surface shape of the three-dimensional curved surface portions 9, 11, 12 should be appropriately determined according to the viscosity of the molten fluid, the affinity for the spinning hole forming member, the spinning speed, and the like. I just need.

7 to 9 show a spinneret manufactured by the method according to the second embodiment of the present invention, and show the case where the present invention is applied to a round cross-section spinneret.
In the drawing, reference numeral 20 denotes the entire spinneret. Similar to the first embodiment, the spinning die 20 includes a metal disk member 21 as a die body and a predetermined number of spinning hole forming members 22.
(Also formed of a ceramic member in the second embodiment). The fixing method of the ceramic member 22 conforms to the first embodiment.

In the ceramic member 22, a spinning hole 23 is provided.
Is formed, and the spinning hole 23 is formed by the introduction portion 24 and the introduction hole portion 2.
5. Three-dimensional curved surface portion 26 (taper narrowing portion), discharge hole portion 27
Consists of The discharge hole portion 27 is formed in a circular cross section, and the introduction portion 24, the introduction hole portion 25, and the three-dimensional curved surface portion 26 are also formed in a circular cross section. Then, the three-dimensional curved surface portion 26
Is smoothly connected to the discharge hole 27 so that the shape line of the inlet 27a of the discharge hole 27 does not appear.

Also in such a spinneret for round cross-section yarn, the inner surface of the hole leading to the discharge hole portion 27 has a three-dimensional curved surface portion 26.
In particular, the inlet 27 of the discharge hole 27
In the portion a, there is no bent portion in the broken line, and an extremely smooth flow of the molten fluid can be obtained. As a result, there is no site where there is a possibility of stagnation, and there is no site where a large pressure loss occurs, and an extremely smooth flow and a low pressure loss are realized despite being reduced to a small diameter. In addition, a spinning hole 23 is provided.
The ceramic member 22 to be used is different from the metal disk member 21.
Accuracy is easy for individual pieces, basically without using electrical discharge machining
Since it can be manufactured well and in large quantities, the spinneret 20
Can be manufactured in a short time and at low cost.

The spinning spinneret for round cross-section yarns can also be modified in the same manner as shown in FIGS. 5 and 6, and the shape and length of the three-dimensional curved surface portion can be changed as necessary. Can decide.

As the molten fluid in the present invention,
It is not particularly limited as long as it can be spun, but the spinneret according to the present invention is particularly suitable for use in a spinneret for synthetic fibers represented by nylon and polyester, that is, a spinneret for spinning a polymer at a relatively high pressure. . Regenerated fibers typified by rayon and semi-synthetic fibers typified by acetate often use a die with a small wall thickness (for example, a simple one having a hole of about 1 mm punched in a plate). Even in such a fiber, the present invention can be applied when a relatively thick die is used.

[0039]

As described above in detail, according to the method for producing a spinning die of the present invention, a portion of the spinning hole leading to the ejection hole portion is formed into a three-dimensional curved surface, which may cause retention. The site can be removed substantially completely, and the pressure loss can be greatly reduced. As a result, the quality of the spun yarn can be improved, and the pressure resistance of the parts on the upstream side including the spinneret can be improved as a result.

Further, the member having the spinning hole is formed separately from the base body , and the member is formed of a ceramic member and fixed to the base body.
A curved surface portion corresponding to the three-dimensional curved surface is formed at a predetermined outer peripheral portion of the hole
By using a pin-shaped mold having
The desired pore rather如above can be easily formed, can be manufactured inexpensively spinning die at a short processing time. The effect of reducing the production cost is more remarkable as the number of holes for spinning increases, and a spinneret having a number of holes of several thousands can achieve a great cost reduction effect.

[Brief description of the drawings]

FIG. 1 is a plan view of a spinneret manufactured by a method according to a first embodiment of the present invention.

FIG. 2 is a side view showing a partial cross section of the spinning die of FIG.

FIG. 3 is an enlarged partial longitudinal sectional view of the spinneret of FIG. 1;

FIG. 4 is an enlarged plan view of the spinning hole of FIG. 3;

5 is a schematic partial vertical cross-sectional view showing a spinning hole shape of the spinning die according to the modified example of FIG. 1. FIG.

FIG. 6 is a schematic partial vertical cross-sectional view showing a spinning hole shape of a spinning die according to another modification of FIG.

FIG. 7 is a plan view of a spinneret manufactured by a method according to a second embodiment of the present invention.

8 is an enlarged partial longitudinal sectional view of the spinneret of FIG. 7;

FIG. 9 is an enlarged plan view of the spinning hole of FIG. 8;

FIG. 10 is a vertical cross-sectional view of a spinning hole portion of a conventional spinning die.

FIG. 11 is an enlarged plan view of the spinning hole of FIG. 10;

FIG. 12 is a vertical cross-sectional view of a spinning hole portion of another conventional spinning die.

FIG. 13 is an enlarged plan view of the spinning hole of FIG.

[Explanation of symbols]

 1, 20 Spinneret 2, 21 Metal disc member as spinneret body 3 Mounting hole 4, 23 Spinning hole 5, 22 Ceramic member 6 Heat-resistant inorganic adhesive 7, 24 Introducing portion 8, 25 Introducing portion 9 , 11, 12, 26 Three-dimensional curved surface part 10, 27 Discharge hole part 10a, 27a Entrance of discharge hole part

Claims (6)

(57) [Claims] 1. A spinneret having a large number of spinning holes including an introduction hole into which a molten fluid is introduced, and a discharge hole having a diameter smaller than the introduction hole through which the molten fluid is discharged from the introduction hole. of
In the manufacturing method , each spinning hole is viewed in the flow direction of the molten fluid, and at least a part of the inner surface of the spinning hole that is connected to the discharge hole inlet is substantially Formed on the original curved surface , each spinning hole, each ceramic part
The ceramic member is formed inside the material and
It is fixed in each mounting hole drilled in the body, and each
The spinning hole in the ceramic member should be
Pin-shaped forming having a curved surface portion corresponding to the three-dimensional curved surface
Make a mold and apply ceramic powder on the pin-shaped mold
A method for producing a spinneret , which comprises forming the member into a shape and firing it . 2. The method for producing a spinning die according to claim 1, wherein a cross section of the discharge hole portion is a modified cross section . 3. The method for producing a spinning die according to claim 1, wherein a cross section of the discharge hole portion is a round cross section . 4. The outer peripheral surface of the ceramic member and the mounting hole
A heat-resistant inorganic adhesive is filled and solidified between the inner surface and
Production of the spinneret according to any one of claims 1 to 3.
Method. 5. A discharge hole in which the three-dimensional curved surface is a spinning hole.
Formed over substantially the entire length of the part
The spinneret according to any one of claims 1 to 4,
Manufacturing method. 6. A transverse cross section of the spinning hole is substantially full length.
6. The cross-section of a modified cross section according to claim 1, 2, 4, 5,
A method for producing a spinneret according to any one of the above.