JPS6253604B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention relates to a device for spinning a spinnable molten raw material such as a resin or pitch by centrifugal force from a nozzle using a rotary spinning method, and particularly relates to a device for spinning spinning using a rotary spinning plate. The present invention relates to means for preventing blockage of pores.

Prior Art Spinning methods for meltable raw materials include the draw spinning method, in which the raw material is extruded from a fixed spinning nozzle into a continuous yarn, which is then drawn, and the molten raw material is supplied to a spinning plate that rotates at high speed. There are two rotary spinning methods in which relatively short fibers are obtained by discharging the fibers from a spinning hole provided in the spinning plate using centrifugal force. Since the stretch-spinning method can impart high orientation to fiber molecules through sufficient stretching, the resulting fibers have excellent strength and a large Young's modulus.
On the other hand, the spinning method using the rotary spinning method cannot be expected to have high strength and high elasticity compared to the former because it does not have sufficient stretching properties, but it is suitable for specific technical fields because the equipment is simple and mass production is possible. It has been awarded an award. That is, it is advantageous to produce activated carbon fibers for cleaners, fibers for heat insulating materials, etc., which do not primarily utilize fiber strength, by the latter method.

In the production of carbon fiber using organic raw materials such as pitch by the rotary spinning method, the pitch raw material melted at high temperature in the raw material melting section is fed from the top into the spinning dish under an inert atmosphere, and the spinning dish is heated. The pitch raw material supplied by the centrifugal force generated by high-speed rotation is discharged to the outside of the spinning plate from multiple spinning holes drilled around the spinning plate, and is then cooled and solidified into fibers. It is collected by appropriate means and sent to the next process.

The molten raw material may contain various foreign substances or infusible substances due to thermal changes during melting and heating, which may clog the spinning holes and make it impossible to continue spinning. This drawback exists in both of the above-mentioned spinning methods. However, in the draw-spinning method, since the nozzle is fixed, it is relatively easy to install a filter near the nozzle, and many proposals have already been made. However, in the rotary spinning method in which the rotating spinning plate rotates at a high speed of several thousand revolutions per minute, the spinning hole also moves at high speed, making it difficult to install a filter. A foreign matter removing means is provided for the supply section. However, in this method, since the distance from the filter to the spinning hole is long, there are many opportunities for foreign matter to be formed again during this time, and the method cannot function completely.

Object and Structure of the Invention In view of the above-mentioned drawbacks of the prior art, the present invention provides a method for completely removing foreign substances from the molten raw material immediately before spinning by installing a filter near the spinning hole in the spinning chamber even in the rotary spinning method. This is intended to prevent clogging of the spinning holes.

The purpose of this is to use a rotating spinning dish in which the molten raw material supplied inside is discharged from spinning holes provided near the periphery and turned into fibers by the centrifugal force generated by the rotation of the spinning dish. This is achieved by a rotating spinning dish characterized by a filter installed in the flow path of the molten raw material inside.

Embodiments The present invention will be explained in more detail below based on embodiments shown in the drawings.

In the first embodiment shown in FIG.
is a vertical shaft 3 attached to the center of the lower surface member 2.
is rotated by an appropriate driving means (not shown) at a speed of several thousand revolutions per minute. The spinning dish 1 is formed by integrally assembling an upper structural member 5 and a lower surface member 2 with bolts 4, and by loosening the bolts 4, both members 2 and 5 can be easily disassembled. It is possible. A molten raw material introduction hole 6 is opened in the center of the upper structural member 5, and receives the raw material from a melting pot (not shown). Further, a spinning hole 8 is formed in the outer peripheral side wall 7 of the upper structural member 5, and the molten raw material is discharged and made into fibers by the centrifugal force generated by the high speed rotation of the spinning plate. Reference numeral 9 indicates a heater, which serves to maintain the temperature of the molten raw material in the spinning dish within a certain range.

A feature of the present invention is that a filter member 10 is provided inside the spinning dish 1 concentrically with the outer peripheral wall 7. The filter member 10 is constructed by welding a metal net 12 to an opening provided in an annular fixed frame 11, as shown in FIG. The upper and lower edges are held in annular grooves 13 provided in the respective members 2 and 5, and their positions are fixed when the members 2 and 5 are assembled.
Each metal net 12 is adjusted to be in front of the spinning hole 8, respectively.

In such a configuration, when a molten raw material is supplied into the spinning dish 1 through the raw material introduction hole 6, the raw material that has reached the lower surface member 2 flows to the periphery along the flow path indicated by the arrow X due to centrifugal force, and flows into the filter member. When passing through the spinning hole 10, components unsuitable for spinning such as infusible matter and foreign matter contained therein are filtered out, and only the pure raw material reaches the spinning hole 8 and is discharged.

Therefore, if the mesh of the metal net 12 is appropriately selected, foreign matter having a large particle size that would clog the spinning hole 8 during spinning can be completely removed, so that good spinning can be expected for a long time. can.

If the filter becomes clogged and the flow resistance increases, immediately stop the spinning operation and replace the bolt 4.
By loosening the spinning plate 1, the spinning plate 1 can be disassembled, the filter member 10 can be taken out and replaced with a new one, or the filter member 10 can be washed to restore its function and then reassembled and used.

In the second embodiment shown in FIG. 3, a metal net 12 is welded to a ring-shaped formwork, and this
It is attached directly below the raw material introduction hole 6 with a bolt 14 so as to cover the hole. In this case, there is an advantage that the filter area can be increased compared to the first embodiment.

FIG. 4 shows a third embodiment of the present invention, in which a mesh block 15 made of sintered metal or the like is used in place of the filter member 10 made of metal net of the first embodiment. This mesh block 15 is formed into a ring shape to fit the inner diameter of the spinning dish 1, and has a thickness of about 10 mm. The filter of this embodiment is excellent in filter efficiency and life.

In addition, the filter member 10 used in the first embodiment is constructed of two layers of coarse and dense metal nets, with a coarse mesh of, for example, 200 mesh arranged in the inner layer and a fine mesh of, for example, 300 mesh arranged in the outer layer. This further improves filter efficiency,
It is possible to extend the lifespan.

The preferred range of meshes for this filter member is 250 to 400 meshes when spinning is performed using a pitch raw material in a spinning dish with a nozzle diameter of 0.3 mm.

Effects of the Invention As described in detail above, according to the present invention, a filter member is provided in the middle of the raw material flow path between the spinning hole and the raw material introduction hole provided in the periphery of the rotating spinning dish, so that foreign substances in the molten raw material can be removed. By removing infusible particles, only good raw materials reach the spinning hole, which prevents the spinning operation from being interrupted due to blockage of the spinning hole during long-term spinning, unlike conventional methods. This eliminates the drawbacks such as deterioration of fiber quality.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the first embodiment of the present invention;
The figure is a perspective view of the filter member used in this, and FIGS. 3 and 4 are the second and third filter members of the present invention, respectively.
A side sectional view of an example is shown. 1...Rotary spinning dish, 2...Lower surface member, 3...
Shaft, 4... Bolt, 5... Superstructure member, 6...
Raw material introduction hole, 7...Outer peripheral side wall, 8...Spinning hole, 9
... Heater, 10 ... Filter member, 11 ... Fixed frame, 12 ... Metal net, 13 ... Annular groove, 1
4...Bolt, 15...Mesh block.

Claims (1)

[Scope of Claims] 1. A rotating spinning dish that discharges the molten raw material supplied therein from a spinning hole provided near its periphery to form fibers by centrifugal force generated by its own rotation, 1. A rotary spinning dish, characterized in that a filter is installed in the flow path of the molten raw material inside the spinning dish. 2. The rotary spinning dish according to claim 1, wherein the filter is provided directly below the raw material introduction hole of the rotary spinning dish. 3. The rotary spinning dish according to claim 1, wherein a filter is provided in front of the spinning hole. 4. The rotary spinning dish according to any one of claims 1 to 3, wherein the filter is a metal net. 5. The rotary spinning dish according to any one of claims 1 to 3, characterized in that the filter is a sintered metal block. 6. The rotary spinning dish according to any one of claims 1 to 5, wherein the filter has a two-layer structure with different meshes. 7. The rotating spinning dish is comprised of an upper structural member and a lower surface member, both of which are integrally assembled by bolts, and the filter is sandwiched between the two members. The rotary spinning dish described in item 1.