JPS62125016A - Spinner apparatus for centrifugal spinning of pitch fiber - Google Patents

Abstract

PURPOSE:To reduce occurrence of vapor deposition shots without deteriorating radiation heating effect, by forming a heat radiation surface constituted of the first facing heat radiation surface and the second facing heat radiation surfaces having a larger spacing than that of the first facing radiation surfaces at the outlet of a nozzle hole. CONSTITUTION:The first and second facing heat radiation surfaces (100a), (100b), (102a) and (102b) are formed from the facing sidewalls of the first circumferential groove 100 in which a spinning nozzle hole 8 is opened to the bottom thereof and the second circumferential groove 102 in which the first circumferential groove 100 is opened to the bottom thereof with a larger width (W2) than that (W1) of the first circumferential groove 100 provided on the outer peripheral surface of a sidewall (6c) of a spinner disk.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is based on Pitch! ! Regarding miscellaneous centrifugal spinning Vt equipment, more specifically, isotropic or mesophase pitch starting from petroleum or coal pitch is used as a raw material, which is heated and melted and centrifugally spun to produce a carbon fiber precursor. The present invention relates to a spinner device for centrifugal spinning of pitch fibers in a centrifugal spinning device for producing pitch fibers.

(Prior art) A spinner device for centrifugal spinning of pitch fibers is generally
A spinner disk comprising a top wall, a bottom wall, and a side wall in which a plurality of spinning nozzle holes are formed, and a rotating shaft attached to the center of the bottom wall of the spinner disk while supplying molten pitch into the spinner disk. By rotating the drive shaft and rotating the spinner disk at high speed,
The molten pitch is spun into pitch fibers through spinning nozzle holes. That is, the molten pitch is discharged from the spinning nozzle hole by the centrifugal force generated by the high speed rotation of the spinner disk, and the discharged molten pitch is caused by the air Fjr generated around it due to the high speed rotation of the spinner disk.
! A is drawn and fiberized to become pitch fibers.

In such a spinner device for centrifugal spinning, the side wall of the spinner disk generally has a generally flat outer peripheral surface, and a spinning nozzle hole is opened on the outer peripheral surface. This is shown in FIG. 1 of Publication No. 58-203105.

(Problems to be Solved by the Invention) Isotropic pitch made from petroleum or coal pitch as a starting material has a large viscosity change with temperature changes, as shown in Figure 8, and the viscosity increases rapidly as the temperature decreases. There is no tendency to do so. This is almost the same for mesophase pitches. Therefore, when such a pitch is used as a raw material and spun using the above-mentioned conventional centrifugal spinning spinner device, the molten pitch after being discharged from the spinning nozzle hole on the side wall of the spinner disk rapidly decreases in temperature and becomes highly viscous, resulting in high viscosity due to air FJ friction. It may solidify before being sufficiently stretched. For this reason, the pig becomes a bead-like mass (called a shot) as shown in FIG. 9, or even if it becomes a fiber, it has a large diameter and is not made into a fiber.

In order to solve such problems, the inventor of the present application first
An invention entitled "Spinning spinner device for centrifugal spinning device for pitch fibers" was proposed in Japanese Patent Application No. 1986 filed on November 1, 1985 by the same applicant as the present application. As shown in FIG. 10, the spinning spinner device for the centrifugal spinning device for pitch fibers according to the present invention has a spinning nozzle hole 8 extending along the circumferential direction of the side wall 6C of the spinner disk 6. The structure is characterized by providing heat radiating surfaces 102a and 102b positioned opposite to each other so as to sandwich the molten pitch P discharged from the molten metal. According to this invention, the molten pitch P immediately after being discharged from the spinning nozzle hole 8 of the spinner disk side wall 6C is warmed by the upper and lower thermal radiation from the thermal radiation surfaces 102a and 102b, so that it can be rapidly cooled. It will be prevented. Although the air FJ119 generated by the high-speed rotation of the spinner disk is somewhat weakened in the space between the heat radiating surfaces of the spinner disk side walls, there is still a high level of air I! outside the heat radiating surfaces. ! ta occurs. Therefore, the molten pitch P immediately after discharge is sufficiently stretched by the air friction of the surrounding air while maintaining a low viscosity, and is blown away in the tangential direction while being turned into I-fibers.

Therefore, the invention of this prior application largely eliminates the problems of the prior art described above.

However, as a result of further research on this prior invention, the inventor of the present application found that this prior invention also has the following problems.

That is, in the spinning spinner device of the prior invention, the light components in the pitch material evaporate from the molten pitch or pitch fibers P discharged from the spinning nozzle hole 8 because it is exposed to the atmosphere, and the evaporated light components Heat radiation surface 102a
, 102b, and this deposit gradually grows and is formed into a rod-shaped deposit (2) extending radially outward under the action of centrifugal force. When this vapor deposit (2) grows to a certain extent, it begins to cause shots (hereinafter referred to as vapor deposition shots).

The following three methods can be considered for this vapor deposition shot. First, the deposited material (■) is heated by centrifugal force to heat radiating surfaces 102a, 102b.
The pitch fiber P that is peeled off and becomes a shot by itself comes into contact with the deposit V that has been peeled off by centrifugal force, and while cutting it, the deposit and the pitch fibers coalesce. and the thermal radiation surface 102.
a.

This is a shot formed by the discharged pitch 111iP coming into contact with the vapor deposited material (1) attached to the film 102b, cutting the pitch fibers, and also peeling off the vapor deposited material. The occurrence of such vapor deposition shots is an obstacle to increasing the productivity of pitch fibers. In order to prevent the occurrence of such vapor deposition shots, it may be possible to widen the distance between the thermal radiation surfaces, but if this distance is wide, the heating effect of the original melting pitch of the thermal radiation surface will be weakened, and the melting pitch will increase. The function of preventing shots from occurring due to rapid cooling becomes impossible.

Therefore, an object of the present invention is to provide a spinner device for centrifugal spinning of pitch fibers equipped with the above-mentioned heat radiating surface, which can reduce the occurrence of vapor deposition shots without impairing the original radiant heating effect. be.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the spinner device for centrifugal spinning of pitch fibers according to the present invention is provided with a spinner that extends in the circumferential direction of the side wall of the spinner disk, and that extends in the circumferential direction of the side wall. , forming a first opposing heat radiating surface and a second opposing heat radiating surface that are arranged opposite to each other so as to sandwich an extension of the central axis of the spinning nozzle hole, and forming the first opposing heat radiating surface at the exit of the spinning nozzle hole. and the second opposing heat radiating surface is arranged adjacent to the first opposing heat radiating surface, and the distance between the second opposing heat radiating surfaces is wider than the distance between the first opposing heat radiating surfaces. The comb has a structure characterized by forming a heat radiating surface with a two-stage structure.

(Function) The first opposing heat radiating surface heats the molten pitch cone formed at the exit of the spinning nozzle hole when the molten pitch discharged from the spinning nozzle hole is spun into pitch fibers, and it creates a moderate viscosity gradient. The molten pitch cone is gradually cooled down to facilitate the fiberization of the molten pitch cone into bitsujimu.
A second opposing heat radiating surface assists in heating the molten pitch cone and heats the generally fibrosed pitch fibers separated therefrom and adjusts its cross-sectional structure as it gradually cools. Therefore, the occurrence of shots due to rapid cooling is reduced. In addition, the first opposing heat radiating surface is located inside the side wall of the spinner disk and is maintained at a relatively high temperature, so that almost no light components evaporated from the molten pitch are deposited, and the second opposing heat radiating surface is spaced apart. Since the area is wide, evaporated light components can easily escape into the atmosphere, reducing the possibility of contact with it.
Its deposition is also reduced. Furthermore, since the second opposed heat radiating surfaces are widely spaced, the possibility that the spun pitch fibers come into contact with each other is reduced. Therefore, the occurrence of vapor deposition shots is also reduced.

(Example) Reference will now be made to the drawings and preferred embodiments of the invention.

FIG. 1 shows a cross section of a main part of a spinner device for centrifugal spinning of the present invention, and FIG. 2 shows the whole. In FIG. 2, the spinner device for centrifugal spinning of the present invention is generally designated by the reference numeral 2, and the spinner device for centrifugal spinning 2 has a top wall 6a having a central opening 4, a bottom wall 6b, and a top wall 6a and a bottom wall. 6b and a side wall 6C having a plurality of spinning nozzle holes 8;
A hollow rotary drive shaft (hereinafter referred to as a hollow rotary shaft) 10 is attached to the center of the bottom wall 6b with a bolt or the like. The top wall 6a1, the bottom wall 6b, and the side wall 6C are made of brass casting, for example.

On the outer surfaces of the top wall 6a and bottom u6b of the spinner disk 6, planar heating elements 12a, 121) made of an electrically conductive heat generating material such as Ni'-Cr alloy are attached in a fixed contact state. In the illustrated embodiment, the planar heating elements 12a, 12b are mounted by covering the planar heating elements 12a, 12b with cover plates 14a, 14b made of stainless steel or the like, and connecting the top wall 6a, the bottom wall 6b, the cover plate 14a, 14b and the appropriate number of bolts lea, 16b (see Figures 3 and 4).
(see figure).

Note that the mounting of the planar heating element is not limited to this. A hollow rotating wheel 1 is provided in the center of the lower cover plate 14b.
An opening 18 larger than the center hole 10a of 0 is made.

A side wall 6 is provided on the outer peripheral surface of the side wall 6C of the spinner disk 6.
First opposing heat radiating surfaces 100a, 100b and second opposing heat radiating surfaces 10 extending in the circumferential direction of a and facing each other across an extension of the central axis of the spinning nozzle hole 8.
2a, 102b are formed, and a first opposing heat radiating surface 100a.

1oob is located adjacent to the outlet of the spinning nozzle hole 8 and approximately equidistant from the extension of its central axis, and the second opposing heat radiating surfaces 102a and 102b are located adjacent to the exit of the spinning nozzle hole 8, and the second opposing heat radiating surfaces 102a and 102b are located adjacent to the exit of the spinning nozzle hole 8
a, next to 100b)? The first opposing heat radiating surfaces 100a, 100b (7) are also located at approximately the same distance from the extension of the central axis of the spinning nozzle hole 8, and the distance W2 is the same.
It is wider than the interval W1. Therefore, the first and second opposing heat radiating surfaces 100a, 100b, 102a, 102b are spun into pitch fibers F while being discharged from the spinning nozzle hole 8 and forming a molten pitch cone C at the outlet of the spinning nozzle hole 8. It constitutes a two-stage thermal radiation surface for the melting pitch.

In the illustrated embodiment, the first and second heat radiating surfaces 100a, 10
0b, 102a, and 102b are a first circumferential groove 100 on the outer peripheral surface of the side wall 6C of the spinner disk 6, in which the outlet of the spinning nozzle hole 8 opens at the bottom, and this first circumferential groove 100.
a second circumferential groove 102 which is open at the bottom and has a groove width W2 wider than the groove width W2, and is formed by opposing side walls of the first and second circumferential grooves 100 and 102. There is. First opposing heat radiating surface 100a.

100b, that is, the depth Dl of the first circumferential groove 100, is preferably made approximately the same as the length of the molten pitch cone (meniscus) C formed at the outlet of the spinning nozzle hole 8, and The depth of the heat radiating surfaces 102a, 102b, ie, the depth D2 of the second circumferential groove 102, is preferably larger than the depth Dl of the first circumferential groove 100.

In the embodiment shown in FIG. 1, the spinning nozzle holes 8 are formed in a row in the circumferential direction on the side 16c of the spinner disk 6, but as shown in FIG. Three rows of spinning nozzle holes 8a.

8b and 8c, and first and second opposing heat radiating surfaces 10 are formed so as to sandwich an extension of the central axis of the spinning nozzle hole.
0a, 100b, 102a.

102b may be formed.

In the embodiments of FIGS. 1 and 5, first and second opposing heat radiating surfaces 100a, 100b, and 102a.

102b was formed by forming circumferential grooves 100 and 102 of two different widths, and as shown in FIG. A pair of collars 104a located approximately equidistant apart from the axis.

104b is fixedly installed, and each collar 104a.

The inner surface of 104b is connected to the first
inner surfaces 100a, 100b, and a second inner surface 102a adjacent to the first inner surface and having a greater distance from the central axis of the spinning nozzle hole 8 than the first inner surface.

102b to form a two-stage shape, and the first and second inner surfaces thereof may be formed.

Furthermore, first and second opposing heat radiating surfaces 100a.

The outlet ends of each of 100b, 102a, 102b may be rounded with a suitable curve to further reduce the deposition of vaporized lights as described below.

Referring again to FIG. 2, the hollow rotating shaft 10 has a bearing 2.
It is rotatably supported within the hollow fixed shaft 22 via 0a and 20b. A pulley 2 is installed at the top of the hollow rotating l111o.
4 is attached, and as shown in FIG. 7, the hollow rotary wheel 1o is rotated by the motor 26 via a belt 29 wound between this pulley 24 and a pulley 28 attached to the output shaft of the motor 26. It is designed to be driven.

A circumferential flange 22a protruding radially outward is formed at the lower end of the fixed hollow shaft 22, and the circumferential flange 22a
closes the central opening 4 with a slight gap at the opening edge of the top wall 6a of the spinner disk 6, and serves as an upper lid for it. Further, a molten pitch supply pipe 30 is attached to the circumferential flange 22a, and its outlet is disposed within the spinner disk θ.

A pair of current supply terminals 32a, 32b, 34a, 34b are connected to the planar heating elements 12a, 12b, respectively, and a thermal lightning pair 3 is connected to the spinner disk 6 as a temperature detection means.
6 is connected. Current supply terminals 32a, 34a are connected to lead wire 38a, and current supply terminals 32b, 34b are connected to lead wire 38a.
is connected to the lead wire 38t), and the thermocouple 36 is connected to the lead wire 38C938d.
a to 38d extend upward through the central hole 10a of the hollow rotating shaft 10.

In the upper part of the hollow rotating shaft 1o and the hollow fixed shaft 22, there is a lead wire 3 within 1° from the outside of the hollow fixed shaft 22.
A rotating current supply mechanism 4o is provided which is electrically connected to these lead wires so that current can be supplied to the terminals 88 to 38d.

In the illustrated embodiment, the rotating energizing mechanism 40 has a hollow rotating shaft 1o.
conductive parts 42a, 42b, respectively attached to the outer periphery of the
Current-carrying rings 44a, 44b, 4 with 42c, 42d
4c, 44d, and conductive parts 42a to 46cj of the conductive rings 44a to 44d, which are housed in retainers 46a, 46b, 46c, and 46cj made of an insulating material attached to the hollow fixed shaft 22.
Current-carrying brushes 48a, 48b are biased radially inwardly by springs to press into contact with brushes 42d.

It consists of an energized brush mechanism equipped with 48c and 48d. Conductive parts 42a are located at positions corresponding to the conductive parts 4'2a to 42d of the hollow rotating ring 10 and the current-carrying rings 44a to 44d.
-42d are exposed to the central hole 10a of the hollow rotating shaft 10 through the horizontal holes 50a, 50b.

50c and 50d are open, and lyI mentions - de I! 1138a to 3sd pass through the horizontal holes 50a to 50d to conductive parts 428 to 42d1. :l It's being continued. Lead wires (not shown) are respectively connected to the energizing brushes 48a to 48d, drawn out to the outside of the retainers 46a to 46d, and connected to necessary devices, respectively. Note that the rotating energizing mechanism 40 is not limited to this structure.

The spinner device 2 for centrifugal spinning constitutes a part of a pitch fiber centrifugal spinning system as shown in FIG.

That is, this system consists of a melting section M and a spinning section S, in which a spinning section S+: a spinner device 2 for centrifugal spinning is arranged.

The melting zone M has a hopper 52, into which isotropic or mesophase solid pitch starting from coal or petroleum pitch is charged. After charging the solid pitch, the hopper 52 expels the air inside, injects nitrogen gas, and exposes the solid pitch to the nitrogen gas.

At the bottom of the hopper 52, three screw-type heating and melting devices 54 having a built-in heating screw 54a are connected, and the heating screw 54a is rotationally driven by a motor 54b.

The solid pitch introduced into the hopper 52 is heated and melted to a temperature of 300 to 350°C by the rotation of the heating screw 54a, and is heated at a constant speed to the outlet 54c at the tip of the screw.
sent to. There is a melting tank 56 at the exit of the screw tip.
is connected, and the heated and melted pitch flows into the melting tank 56 and is collected on a certain head.

A gear pump 56b driven by a motor 56a is provided at the bottom of the melting tank 56, and the molten pitch is sent to the aforementioned supply pipe 30 by the gear pump 56b. The molten pitch that has reached the supply pipe 30 flows from there into the spinner disk 6 of the spinner device 2 for centrifugal spinning.

Melting of the solid pitch may be direct in the melting tank 56 in an inert atmosphere, in which case it will be batchwise.

The use of a hopper 52 and a heating screw assembly 54 allows continuous melting of the solid pitch.

The solid pitch entering the melting zone M is melted at a temperature that does not cause thermal decomposition of the pitch.

Centrifugal spinning of molten pitch by the centrifugal spinning spinner device 2 is performed as follows. Before the molten pitch flows into the spinner disk 6 from the supply pipe 3o, nitrogen gas is supplied from the supply pipe 30 into the spinner disk to expel the air therein and create a nitrogen atmosphere. An energizing brush 48a of the rotating energizing mechanism 40 is supplied from a current supply source (not shown),
Lead wires 38a, 38 are connected to these brushes through 48b.
terminals 32a, 34a and 32 connected via b
b, 34b are supplied with current, and the planar heating elements 12a, 12
b generates heat and heats the top wall 6a, bottom wall 6b, and side wall 6C of the spinner disk 6. The temperature of the spinning portion near the side wall 6C of the spinner disk 6 is detected by the thermal lightning pair 36, and the current is sent from the energizing brushes 48G, 48d of the rotating energizing mechanism 40 to a control section (not shown) via the lead wires 38G, 38d. , controls the amount of current supplied to the terminals 32a to 34d, and controls the side wall 6C of the spinner disk 6.
The temperature of the nearby spinning section is controlled to a constant temperature of, for example, about 300 to 360°C.

After this, the molten pitch is supplied from the supply pipe 30 into the spinner disk 6, and at the same time the pulley 24.2
8 and the hollow rotating shaft 10 by the motor 26 via the belt 29.
By rotating the spinner disk 6 about 140
Rotates at a high speed of 0 to 250 rpm. As a result, the molten pitch that has flowed into the spinner disk 6 is transferred to the side wall 6C.
The fibers reach the spinning nozzle hole 8, from which they are discharged to the outside by centrifugal force, are made into fibers by the surrounding air eta induced by the high speed rotation of the spinner disk 6, and are spun into yarns with a pitch of m and E.

As described above, the planar heating elements 12a, 12b and the thermal lightning pair 3
The temperature of the spinning portion near the side wall 6C of the spinner disk 6 is controlled to a constant temperature of approximately 300 to 360°C by the sheet heating element 12a.

121) are the top wall 6a and bottom wall 6 of the spinner disk 6.
b, so that when the temperature of the top wall 6a, bottom wall 6b, and side wall 6C tries to decrease, the planar heating element 12a
, i2b, and the temperature is accurately controlled at a constant temperature of approximately 300 to 360°C. Therefore, the temperature of the spinning part near the side wall 6C is not affected by the temperature of the molten pitch, and even if the temperature of the molten pitch is kept low until it reaches the spinning nozzle hole 8 of the side wall 6C, when it passes through the spinning nozzle hole 8. The temperature of that part is instantaneously heated to a constant temperature of about 300 to 360 DEG C., and the temperature of the molten pitch passing through the spinning nozzle hole 8 is precisely controlled.

Therefore, in the spinner disk 6, the molten pitch foams,
The pitch fibers formed through the spinning nozzle hole 8 are successfully fiberized without causing any deterioration such as phase separation.
Moreover, there is no variation, and the cross-sectional structure after forming carbon m-fibers can be easily controlled. This is true even when the amount of molten pitch discharged from the spinning nozzle hole 8 is varied or increased, and when the amount of discharged is increased, the productivity of pitch fibers can be increased.

Further, in the spinner device 2 for centrifugal spinning, the current supply terminals 328 to 34b and the lead wires 388 to 38 (j are connected to the central hole 10a of the hollow rotating wheel 10
through the hollow rotating shaft 10 and the hollow fixed shaft 22, and connecting it to the rotary energizing mechanism 40 provided on the hollow rotating shaft 10 and the hollow fixed shaft 22 so as to communicate with the outside of the hollow fixed shaft, the overall structure is very compact and can be installed in a wide space. Doesn't require space.

Note that heating means for the spinner disk 6 of the spinner device 2 for centrifugal spinning include planar heating elements 12a, 12.
Instead of providing the top wall 6a of the spinner disk 6,
The bottom wall 6b and the side walls 6C themselves may be made of an electrically conductive heat generating material such as a Ni-Cr alloy, and in this case as well, the same direct heating effect and space saving effect as described above can be obtained.

Further, in the spinner device 2 for centrifugal spinning, when the molten pitch discharged from the spinning nozzle hole 8 is spun into pitch fibers F, the first and second opposed heat radiating surfaces 100a,
100b, 102a.

It is spun into pitch fibers while receiving radiant heat from 102b. That is, the first and second opposing heat radiating surfaces 100a, 10
0b, 102a, and 102b, like the side wall 6c of the spinner disk 6, are heated by the planar heating elements 12a, 12b and the heat brought in by the molten pitch in the spinner disk 6, and emit radiant heat. Among them, the first opposing heat radiation surface 1
00a.

The radiant heat emitted from the spinning nozzle hole 8 is applied to the molten pitch cone C formed at the exit of the spinning nozzle hole 8 when the molten pitch discharged from the spinning nozzle hole 8 is spun into pitch fibers, heating it and It is not cooled rapidly, but is cooled moderately so that a suitable viscosity gradient is formed and the material is turned into fibers.

In addition, the radiant heat emitted from the second opposed heat radiating surfaces 102a and 102b not only assists in appropriate cooling of the molten pitch cone C, but also separates from it and is applied to the molten pitch that has become almost fibrous, heating it. The cross-sectional structure of the pitch fiber F is adjusted so that it is cooled appropriately. Therefore, the occurrence of shots due to cooling of the molten pitch is greatly reduced.

Since the molten pitch discharged from the spinning nozzle hole 8 is exposed to the atmosphere, light components in the pitch material evaporate,
This evaporated light content is transferred to the thermal convergence chamber 10 of the above two-stage structure.
0a, 100b, 102a.

It was found that only a small amount was deposited on 102b. The reason is assumed to be as follows. That is, the light components evaporated from the pitch material are transferred to the first opposing heat radiating surfaces 100a, 1
00b is located inside the side wall 6c of the spinner disk 6 and is maintained at a relatively high temperature, making it difficult to evaporate (2nd opposed heat radiating surfaces 102a, 102b).
This is because the width between the surfaces is wide and the surface is open to the atmosphere, so the particles escape into the atmosphere without coming into contact with these surfaces. Further, the molten pitch that has separated from the molten pitch cone C and has become almost fiberized, that is, the pitch fibers F, is emitted in the tangential direction between the outer second opposed heat radiating surfaces 102a and 102b with a slight deviation.
2a.

Since the space between 102b is wide, even if there is a shake, the light is emitted without almost touching it. Therefore, even if evaporated light components are deposited at the corners of the outlet ends of the second opposing heat radiating surfaces 102a, 102b and a deposit is formed, the pitch fibers will come into contact with the deposit and be cut. The possibilities become fewer and fewer.

Therefore, both the occurrence of vapor deposition shots due to the vapor deposits formed on the heat radiating surface being peeled off by centrifugal force, and the occurrence of vapor deposition shots due to the pitch tlil fibers coming into contact with the vapor deposition are greatly reduced.

It is clear that the same effect of reducing the deposition shots can be obtained even if J3 is used in the embodiments shown in FIGS. 5 and 6.

Experimental examples and comparative examples in which pitch fibers are spun using the centrifugal spinning spinner boar neck of the present invention are shown below. In Experimental Examples (1) and (2), the spinner apparatus for centrifugal spinning shown in Figures 1 and 2 was used, and Experimental Example (
In 3), the fifth spinner device for centrifugal spinning is
Using what is shown in Figures and Figure 2, in the comparative example, the first application of the earlier application
The heat radiating surface shown in FIG. 0 was roughened into a spinner device for centrifugal spinning shown in FIG. 2 and used. Isotropic pitch having temperature-viscosity characteristics as shown in FIG. 8 was used as the raw material.

As can be seen from the table below, in the case of the present invention, the shot rate remained almost unchanged at around 2%, and the deposition shot rate decreased from 8% to 2%. The "shot rate" is
In addition to the shots that occur due to the rapid cooling of the molten pitch described above, clumps may occur when fibers become entangled after being discharged from the spinning nozzle hole. The term ``'' was used to include such lumps.

Note that all shot rates are shot rates by weight, and are calculated as shot rate = shot @ ratio / (shot + vapor-deposited shot raw fiber) weight, and vapor-deposition shot rate = vapor-deposition shot width / (shot + vapor-deposition shot -)! I & miscellaneous) Calculated by weight.

(Effects of the Invention) As is clear from the above, according to the spinner device for centrifugal spinning of pitch fibers of the present invention, there is a first opposing heat radiating surface at the outlet of the spinning nozzle hole, and a second opposing heat radiating surface with a large spacing between J and J. Since a two-stage thermal radiating surface consisting of two opposing thermal radiating surfaces is formed, the molten pitch discharged from the spinning nozzle hole is not cooled rapidly but is cooled appropriately, and fiberization is smooth. In addition to reducing the occurrence of ordinary shots caused by rapid cooling, the occurrence of deposits itself is reduced, and the contact of the pitch fibers with the deposits is almost eliminated, so the number of deposition shots is also greatly reduced. High quality pitch fibers can be efficiently produced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing first and second opposing heat radiating surfaces of a spinner device for centrifugal spinning of pitch fibers according to an embodiment of the present invention, and FIG. 2 is a sectional view showing pitch fibers according to an embodiment of the present invention. FIG. 3 is an enlarged sectional view showing the left half of the boar-necked spinner disk portion shown in FIG. 2, and FIG. 5 and 6 are cross-sectional views similar to FIG. 1 of the spinner loading for centrifugal spinning according to an embodiment of the present invention; FIG. 7 is a bottom view of the disk; FIG.
8 is a schematic diagram (not showing the entire centrifugal spinning system) including the centrifugal spinning spinner device shown in the figure; FIG. The figure is a cross-sectional view showing the spinning state in the spinbo disk of a conventional centrifugal spinning spinner device that does not have any opposing heat radiating surfaces. 1 is a cross-sectional view similar to FIG. 1 of a spinner device for centrifugal spinning with one stage of opposing heat radiating surfaces; FIG. In the figure, code 2... spinner device for centrifugal spinning, 6...
- Spinner disk, 6a...Top wall, 6b...Bottom wall, 6C...Side wall, 8.8a, sb, 8G...Spinning nozzle hole, 100a,
100b...first opposing heat radiating surface, 102a, 102
b... Second opposing heat radiating surface, 100... First circumferential groove, 102... Second circumferential groove, 104a, 104 b
- A pair of brim, C... fused pitch cone, F... pitch lIt.

Claims (1)

Scope of Claims: (1) By rotating the spinner disk at high speed while supplying the molten pitch into a spinner disk consisting of a top wall, a bottom wall, and a side wall with a plurality of spinning nozzle holes, the molten pitch is In a spinner device for centrifugal spinning of pitch fibers, which spins pitch fibers into pitch fibers through the spinning nozzle hole, the spinning nozzle hole has a spinner on the outer circumferential surface of the side wall of the spinner disk, extending in the circumferential direction of the side wall and at the center of the spinning nozzle hole. forming a first opposing heat radiating surface and a second opposing heat radiating surface that are arranged opposite to each other so as to sandwich an extension line of the axis;
The opposing heat radiating surfaces are arranged adjacent to the outlet of the spinning nozzle hole, the second opposing heat radiating surface is arranged adjacent to the first opposing heat radiating surface, and the spacing between the second opposing heat radiating surfaces is set to a first distance. 1. A spinner device for centrifugal spinning, characterized in that the distance between the opposing heat radiating surfaces is made wider than the distance between the opposing heat radiating surfaces, thereby forming a heat radiating surface having a two-stage structure. (2) a first circumferential groove in the outer peripheral surface of the side wall of the spinner disk, in which the outlet of the spinning nozzle hole opens at the bottom;
The first circumferential groove opens at the bottom and forms a second circumferential groove having a groove width wider than the first circumferential groove, and the first opposing heat radiating surface is connected to the first circumferential groove. the second
2. The spinner device for centrifugal spinning according to claim 1, wherein the opposing heat radiating surfaces are formed by opposing side walls of the second circumferential groove. (3) The centrifugal spinning spinner device according to claim 1, wherein the depth of the first opposing heat radiating surface is approximately the same as the length of the molten pitch cone formed at the exit of the spinning nozzle hole. (4) The spinning nozzle holes are formed in a plurality of rows in the circumferential direction, and the first and second opposing heat radiating surfaces define an extension line of the central axis of each spinning nozzle hole in the plurality of rows. Claim 1 which is arranged opposite to each other so as to be sandwiched therebetween.
A spinner device for centrifugal spinning as described in 2. (5) A pair of flanges located above and below the outlet of the spinning nozzle hole are fixed to the outer circumferential surface of the side wall of the spinner disk, and the inner surface of each collar is connected to the first side adjacent to the outlet of the spinning nozzle hole. an inner surface, and a second inner surface adjacent to the first inner surface and having a larger distance from the central axis of the spinning nozzle hole than the first inner surface.
The first opposed heat radiating surface is composed of the first inner surface of the pair of ribs, and the second opposed heat radiating surface is composed of the second inner surface of the pair of ribs. A spinner device for centrifugal spinning according to claim 1, which comprises an inner surface.