JPH0660450B2 - Spinning method for conductive filament - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for spinning an electrically conductive filament, which directly produces an electrically conductive melt from a molten metal, particularly a molten metal.

[Conventional technology]

Conventionally, the method of manufacturing filament directly from molten metal, omits the drawing process, makes the difficult work material filament,
Various manufacturing methods have been developed because of advantages such as appearance of filaments having new physical properties by rapid solidification.

For example, JP-A-55-6494 according to the invention of the present applicant
There is a method described in Japanese Patent No. 8 publication.

This method will be explained with reference to FIG. 3. Water is put in a drum (2) supported and rotated by a base (1), a liquid layer (3) is formed by centrifugal force, and a heating coil (4) is formed. The molten metal (5) melted by is sprayed from the nozzle (6) into the liquid layer (3) as a molten jet (7) and solidified in the liquid layer (3) to produce filament. is there.

Also, as shown in FIG. 4, the endless belt (9) having the groove (8) is moved through a plurality of rolls (10),
The cooling water (12) is supplied to the groove (8) from the water injection pipe (11). And the molten metal (5) melted by the heating coil (4)
There is also a method of injecting water into the cooling water (12) from the nozzle (6) to solidify it.

[Problems to be solved by the invention]

By the way, in the method shown in FIG. 3, when the molten jet (7) enters the liquid layer (3) as shown in FIG. 5, it does not smoothly enter as shown by the broken line, but as shown by the solid line. Once it is repelled, the jet (7) is disturbed and a uniform and continuous filament cannot be obtained.

Further, in the case of filaments having a low density, the filaments float on the liquid surface of the liquid layer (3) for a long time, the cooling rate decreases, and the jet (7) is easily disturbed.

[Means for solving problems]

The present invention has been made with the above points in mind,
A method for spinning a conductive filament that directly produces a filament from a conductive melt, wherein a magnetic field is applied to the conductive filament while energizing the spinning filament during spinning to control the movement of the filament. .

[Action]

Therefore, according to the present invention, since the filament is energized and the magnetic field is applied, the movement of the filament is controlled, and the molten jet may smoothly enter the cooling liquid layer and disturb the jet. A uniform filament is produced.

〔Example〕

Next, the present invention will be described in detail with reference to FIGS. 1 and 2 showing one embodiment in the case of spinning aluminum.

In these drawings, (13) is a drum supported by a base and rotated, and (14) is a drum made of a non-magnetic acrylic plate or the like.
(13) side plate, (15) a drum (13) peripheral plate made of a conductor,
(16) is an outflow prevention plate made of non-magnetic material, (17) is a drum (13)
Is a liquid layer for cooling formed on the inner peripheral surface of the centrifugal force by centrifugal force.

(18) is a molten metal injection device installed on one side of the drum (13), and molten metal melted by the high frequency coil (19)
(20) is injected as a molten jet (23) into the liquid layer (17) from a quartz nozzle (22) of about 100 μm by the pressure of argon gas from the injection pipe (21).

(24) is a winding roll installed on the other side in the drum (13), a slit is formed on the peripheral surface, and the slit has a suction action by sucking the inside of the roll (24) to a vacuum, and The roll (24) is movable left and right.

(25) is a first magnet composed of an electromagnet installed on the peripheral edge of the drum (13) near the nozzle (22), and (26) is a winding roll (24)
Is a second magnet composed of an electromagnet installed in the peripheral portion of the drum (13) near the first magnet. In FIG. 1, the first magnet (25) is from the top to the bottom of the paper and the second magnet (26) is the paper. A magnetic field is formed from the bottom to the top.

(27) is a filament in which the molten jet (23) is solidified in the liquid layer (17), (28) is a contact piece that is in sliding contact with the peripheral plate (15) of the drum (13), and (29) is a DC power source. , Molten metal (20), molten jet (23), solidified filament (27), peripheral plate (15), contact piece
Apply a direct current to the electric circuit of (28).

Therefore, the molten jet (2
After entering the liquid layer (17), the electromagnetic force F _{1 in the} same direction as the centrifugal force acts on the 3) so that it is quickly pressed against the peripheral plate (15) of the drum (13) by the centrifugal force. As shown by the solid line in the figure, it does not float or vibrate, smoothly enters the liquid layer (17), the jet (23) is not disturbed, and the uniform filament (2
7) is obtained.

Further, at the start of spinning, only the second magnet (26) does not act on the first magnet (25). At this time, filament
Since the electromagnetic force F ₂ acting in the opposite direction to the centrifugal force acts on (27), the filament (27) becomes a liquid layer (17) as shown by the broken line in FIG.
Floats on the surface of the sheet, is adsorbed to the slit of the winding roll (24) located on the left side, and is wound up by the winding roll (24). After this winding, the roll (24) is positioned to the right and the second magnet (2
Stop the action of 6) and activate the first magnet (25),
As described above, the molten jet (23) and the solidified filament (27) are brought into quick contact with the peripheral plate (15) by the electromagnetic force F ₁ .

Therefore, according to the conventional method shown in FIG. 3, the spun filament cannot be wound continuously, but in this embodiment, it can be easily wound continuously, and
It can also be applied to the case of non-magnetic filament.

When the filament (27) is a magnetic material, it is possible to easily wind it by using a magnet for the winding roll (24).

Furthermore, when the magnetic field generated by the first magnet (25) is reversed at an appropriate cycle, or the energizing current to the jet (23) is intermittently or reversed and the jet (23) is vibrated, it becomes like a molten metal jet. A fragile jet easily breaks,
It is possible to easily obtain short fibers having a length corresponding to the vibration cycle.

Next, a specific example of FIG. 1 will be described.

Water containing about 5% of sodium chloride was used as a cooling liquid for the liquid layer (17), and permanent magnets having magnetic flux density between the magnetic poles of about 0.1 wb / m ² were used for the first and second magnets (25) and (26). Use, diameter about 100μ
When a current of about 1 to 2 A was applied to the aluminum filament of m, there was no vibration of the jet as shown by the solid line in FIG. 5, and it was possible to continuously wind a fine wire more uniform than before.

Also, by using an electromagnet as the first magnet (25) and applying an alternating magnetic field, it was possible to obtain various short fibers having a uniform length.

Further, it goes without saying that the power source and the magnet may be not only direct current but also alternating current if they are aligned according to the purpose.

Next, the case of managing the spinning state will be described.

As described above, the jet (23) and filament (27) may be energized and the energization resistance measured. That is, when the resistance is constant and does not change, a continuous line is normally obtained, and when it fluctuates or a pulse-like change occurs, the wire is often broken.

Also, without energizing the filament (27), the filament (2
Measure the voltage generated in 7). That is, if the voltage is constant, the filament (27) passes through a constant path, and if the filament (27) is not in constant path, the filament (27)
The magnetic flux passing through changes the voltage.

〔The invention's effect〕

As described above, according to the present invention, by energizing the filament and applying a magnetic field, the movement of the filament is controlled, the molten jet can smoothly enter the liquid layer, and the disturbance of the jet can be prevented. A uniform filament can be spun.

[Brief description of drawings]

FIG. 1 shows a method for spinning a conductive filament according to the present invention.
FIG. 1 is a partially cut front view, and FIG. 2 is a first embodiment.
Part of the figure is a cutaway side view, and FIG. 3 and the following figures are partial cross-sectional views of a conventional spinning method. FIGS. Front view of another example, FIG. 5 is FIG.
It is a partially enlarged view of (a). (23) …… Melting jet, (25) …… Magnet, (27) …… Filament.

Claims (1)

[Claims] 1. A method for spinning a conductive filament, which directly produces a filament from a conductive melt, wherein the conductive filament is energized and a magnetic field is applied during spinning to control the movement of the filament. Spinning method.