JPS6254885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon fiber spinning apparatus that is novel and has great industrial applicability.

Originally, in an apparatus for spinning pitch fiber from pitch, particularly mesophace pitch (oil-based, coal-based, etc.), as shown in FIG. Carbon fibers are fed into the nozzle head 1 by an eider 14 and spun out by a spinneret 4 attached to the nozzle head 1, but heating in this conventional device is performed only by heating wires embedded in the side peripheral wall 3 of the nozzle head. Generally, the molten pitch stock solution is maintained at around 300° C., and therefore, as the spinneret spinning surface 42, which is in direct contact with the outside air, is separated from the heated nozzle head side circumferential wall 3, In other words, the temperature decreases as the position approaches the center of the spinning surface 42, and such temperature non-uniformity on the spinning surface 42 is inevitably caused by uneven viscosity of the carbon fibers discharged onto the spinning surface 42. Therefore, it has been a concern in the field of carbon fiber spinning to eliminate such defects, which frequently cause yarn breakage and make stable spinning impossible.

The apparatus of the present invention aims to completely solve the above-mentioned problems by very effectively maintaining a uniform temperature at the spinning face of the spinneret.

Next, the configuration of the present invention will be specifically explained with reference to drawings showing embodiments.

Reference numeral 1 denotes a nozzle head that contains the molten pitch stock solution 2 to be press-fitted, and includes a heating wire (not shown).
is embedded in the side peripheral wall 3 so that the nozzle head can adjustably heat one volume of the molten pitch stock solution 2.

4 is a spinneret attached to the lower end of the nozzle head 1, 5...5 is a plurality of spinning solution guide holes opened in the spinning solution receiving surface 41 of the spinneret 4, 6...
Reference numeral 6 denotes a straight pipe-shaped discharge hole that communicates with the diameter-reduced end of the spinning dope introduction holes 5...5 and opens into the spinning surface 42; This figure shows an embodiment in which the straight tubular portion and the tapered cross-sectional portion whose diameter decreases downward are vertically connected to each other.

Reference numeral 7 indicates one or more heating wires which constitute a main part of the present invention, and are equally spaced from a large number of the discharge holes 6 to 6 in accordance with the arrangement of the discharge holes 6 to 6. The discharge hole starting end 61 is formed in a straight or curved shape, and is formed in a straight or curved shape, as shown in FIG.
. . 61, that is, in the upper and lower positions near the portions of the discharge holes 6 .

To exemplify the arrangement of the heating wires 7 described above, when the discharge holes 6...6 are arranged in a circular shape or concentric circles, the heating wires 7 are arranged in a circular shape as shown in FIG.
For example, two rows of discharge holes 6 arranged in a concentric circle...
6 are buried at equal intervals between two rows, and the discharge holes 6...6 are arranged in parallel, as shown in FIG. They are embedded in the discharge holes 6 at equal intervals.

Although there is no limitation on the manner in which the heating wires 7 are buried, for example, as shown in FIG. After the hot wire 7 is deposited, it is extremely preferable to cover the upper surface of the spinneret 4 with a presser plate 9 which integrally forms the spinning solution guide holes 5 . . . 5 . Incidentally, 10 in FIG. 4 is a presser plate connector.

In the present invention, the above-mentioned heating wire 7 is connected to a temperature controller 11 disposed at an appropriate location, and the nozzle head side peripheral wall 3 is heated and the temperature controller 11 is heated.
The spinning surface 42 of the spinneret 4 is heated uniformly by heating the heating wires 7 controlled by the heating wires 7, and the wires 12...12 are connected to the temperature controllers 11, which are arranged in plural on the spinning surface 42. It is a temperature sensor.

In FIG. 1, 13 is a hopper, 14 is a screw feeder, and 15 is a carbon fiber.

As is clear from the above configuration, the apparatus of the present invention can easily and reliably obtain the uniform heat retention effect on the spinning surface, which is essential for stable fiber spinning in a carbon fiber spinning apparatus. It is possible to completely prevent the frequent occurrence of thread breakage, which could not be achieved in the conventional spinning apparatus, and the structure allows production at a relatively low cost, so that it has great industrial applicability.

Example 1 A spinneret having an outer diameter of 80 m/m and a circular arrangement of 10 discharge holes of 0.2 m/mφ was provided with concentric heating wire embedding grooves carved on the inner surface of the circular arrangement. A cartridge heater connected to the temperature controller is buried in the heating wire embedding groove, and together with heating the peripheral wall of the nozzle head side to which the spinneret is attached, the discharge surface is heated approximately.
When the molten stock solution of petroleum-based mesophase pitch was spun by heating uniformly to 300°C, fiber spinning was carried out smoothly in all holes from the initial yarn stand, and no yarn breakage was observed.

Example 2 A spinneret having 100 discharge holes of 0.2 m/mφ with an outer diameter of 150 m/m and two concentric circular arrays was carved with concentric heating wire embedding grooves between the circular arrays. A cartridge heater connected to the temperature controller is buried in the heating wire embedding groove, and the discharge surface is set to approximately 300°C in conjunction with heating the peripheral side of the nozzle head where the spinneret is installed. When the temperature was measured using six sensors installed, it was 300℃±6℃.

Regarding this device, when the same melted stock solution of petroleum-based mesophase pitch as in Example 1 was spun, 6
After wiping twice, smooth fiber spinning was observed from all holes, and there was no yarn breakage phenomenon.

[Brief explanation of the drawing]

FIG. 1 is a general explanatory diagram of a carbon fiber spinning device;
2 to 4 show embodiments of the device of the present invention,
Among them, Fig. 2 is a plan view showing one embodiment, and Fig. 3 is a plan view showing one embodiment.
The figure is a plan view showing another embodiment, and FIG. 4 is a longitudinal sectional side view of the main part. In the drawing, 1 is a nozzle head, 2 is a molten pitch stock solution, 3 is a nozzle head side peripheral wall, 4 is a spinneret, 4
1 is a spinning dope receiving surface, 42 is a spinning surface, 5...5 is a spinning dope introduction hole, 6...6 is a discharge hole, 61 is a starting end of the discharge hole, 7 is a heating wire, 8 is a heating wire embedding groove, and 9 is a presser foot. 10 is a holding plate connector, 11 is a temperature controller, 12 is a temperature sensor, 13 is a hopper, 14 is a screw feeder, and 15 is a carbon fiber.

Claims (1)

[Scope of Claims] 1. A spinneret in which a plurality of discharge holes communicating with the reduced diameter end of the spinning dope solution introduction hole are opened on the spinning surface in a side peripheral wall heating nozzle head that contains the molten pitch stock solution to be press-injected. In the attached carbon fiber spinning device, the discharge holes 6...
One or more of the heating wires 7 formed in a linear or curved shape spaced at equal intervals over a large number of spinnerets 4 are placed horizontally at upper and lower positions near the discharge hole starting ends 61...61 in the entire thickness of the spinneret 4. A temperature controller 11 is placed in the heating wire 7 and placed in a suitable position.
A carbon fiber spinning apparatus characterized in that the spinning surface 42 of the spinneret 4 is uniformly heated by heating the nozzle head side circumferential wall 3 and heating the heating wire 7 controlled by the temperature controller 11. . 2. The carbon fiber spinning apparatus according to claim 1, wherein the heating wire 7 has a circular shape corresponding to the discharge holes 5...5 arranged in a circular shape or concentric circles. 3 The heating wires 7 are arranged in a parallel manner through the discharge holes 5...5
The carbon fiber spinning device according to claim 1, which has a straight line shape corresponding to. 4 The heating wire 7 is connected to the spinning dope receiving surface 4 of the spinneret 4.
1, and integrally with the spinneret 4, the spinning solution guide hole 5...
2. The carbon fiber spinning apparatus according to claim 1, wherein a presser plate 9 having a shape of 5 covers the upper surface of the spinneret 4.