JPS60119224A - Method for charging pitch yarn into infusibilizing furnace - Google Patents

Abstract

PURPOSE:To carry out the infusibilizing treatment of pitch yarns uniformly and easily with high production efficiency, by deforming a flexible bobbin, taking out a pitch yarn from the flexible deformed bobbin, and charging only the pitch yarn cake into an infusibilizing furnace. CONSTITUTION:A pitch yarn (1a) is first wound around a flexible bobbin 2, e.g. a plastic, and the flexible bobbin 2 is then deformed to take out and leave only the pitch yarn cake 1 from the bobbin 2. The resultant pitch yarn cake 1 is then charged into an infusibilizing furnace or further into a carbonizing furnace to give pitch based carbon fibers. The pitch yarn (1a) is wound by inserting the bobbin 2 into rotating drums 4 and 5, integrating the bobbin 2 with the rotating drums 4 and 5 with a fixing member 3, and rotating the transmission shaft 8. EFFECT:Work labor and a large-scale apparatus are not required, and the pitch yarn is easily handled.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of feeding pinched yarn into an infusible furnace or subsequently into a carbonization furnace. This invention relates to an improvement in the handling of spun pinch yarn before treatment.This is used in the field of efficiently performing infusible treatment of pitch yarn.

[Prior art]

The pitch yarn used in the production of pinch carbon fiber is extremely fragile compared to that of acrylic carbon fiber, and easily breaks when tensile force is applied, making it extremely difficult to handle. Therefore, although the production technology for pinch carbon fibers has not yet been established, there are still many unknown fields compared to the case of acrylic carbon fibers. In other words, the high-strength pitch-based carbon fiber after carbonization has a high strength, for example, about 200 to 300 Kg/m%, which is comparable to acrylic carbon fiber, but the pitch yarn after spinning is weak and has been passed through the infusibility process. is also extremely fragile, with only a few kg/rn
This is because it only has an intensity of i. Therefore, the handling of the pinched yarn after spinning and before melting becomes a problem, and treatment methods that enable uniform heating for infusibility, carbonization, and graphitization are being investigated. As an example,
The fact that Japanese Patent Laid-Open No. 57-175664 proposes a device requiring many means shows that it is not easy to handle.

In this case, the pitch yarn spun by the spinning nozzle is wound onto a bobbin and then transferred onto a conveyor, and the bobbin is rotated and moved from side to side at a speed slower than the winding speed to prevent the weak pitch yarn from breaking. The pitch thread is unraveled and placed on the moving conveyor in a sagging manner. The vinyl yarns are fed into the infusibility furnace as the conveyor moves, in a state where they are easily heated evenly without becoming 01 each other.
It is infusible at a temperature of about 00 to 500 degrees.

In such a method, when the pitch yarn is wound one by one and placed on the conveyor, the pitch yarn may break, so a device is required to prevent this. In addition, it is necessary to reduce the feeding speed of the con-hair to ensure the time necessary for the infusibility treatment, and as a result, long con-hair
Accordingly, it becomes necessary to make the carbonization and graphitization furnaces, including the C infusibility furnace, larger or longer. Furthermore, it is difficult to equalize the heating in the infusibility furnace on the side of the pitch yarn that contacts the conveyor and the side that does not, which tends to cause variations in the degree of infusibility treatment. In addition, the pitch yarn that is piled up on the conveyor must be collected from the infusibility furnace for the next process, which is carbonization at high temperatures of 1,000 to 1,800 degrees and black metal 11 treatment at 2,000 degrees. However, there are many problems, including that the work is not easy.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned problems by 1η7, and its purpose is to extremely facilitate the handling of pitch yarns when performing carbonization treatment before infusibility treatment from spinning, and to process yarns of pitch yarns. The uniformity of f: () becomes 1liJ,
In addition, miniaturization of each furnace including the infusibility furnace, and -
To provide a method for feeding pitch yarn into an infusible furnace or a subsequent carbonization furnace, which facilitates the conveyance of falling pitch yarn and greatly reduces the time required to improve the production efficiency. That's true. In addition, the carbonization process is conducted with electricity at 1o.
Because it is necessary to process at high temperatures exceeding 100 degrees, the material of the bobbin that becomes the core when it is shaped into a spool and placed in the furnace is made of special materials such as high-grade stainless steel, ceramic, and graphite. It needs to be made from materials.

In addition, since the bobbin rotates at a speed of 100 revolutions per minute when winding pitch thread, it must be processed to have a uniform thickness and be dynamically balanced, and furthermore, for the safety of the operator, the bobbin must not break. There are challenges. Making a bobbin that does not meet these requirements is not only expensive but also involves various technical difficulties. Furthermore, if the production volume of pinch yarn increases, a large number of bobbins will be required, which will inevitably be economically disadvantageous. Therefore, the present invention aims to increase uniformity by heating from both sides of the spool by removing the core material of the vinyl yarn wound into a spool, and to reduce the temperature exceeding 1000 degrees that occurs during carbonization. It is with this in mind that the technical difficulties and economic disadvantages associated with the production of bobbins can be eliminated.

[Structure of the invention]

To explain the features of the present invention with reference to the drawings, in the production of pitch-based carbon fiber, the spun pitch yarn 1a is wound around a flexible bobbin 2, and the flexible bobbin 2 is
To transform the pitch yarn 1a, which is wound around 3L,
Pull out the strands, 8: Remove the pinched thread 1
Lithization is also useful for the pitch yarn that is subsequently fed into the carbonization furnace! This is a method of charging into other furnaces.

〔Example〕

Hereinafter, the method of the present invention will be explained in detail based on the drawings showing examples thereof.

FIG. 1 is an exemplary perspective view schematically showing the winding section of a winding machine that makes the method possible. In the figure, reference numeral 1 denotes a pitch yarn unit in which spun pitch yarn 1a is wound around a flexible bobbin 2 to form a cake shape. flexible bobbin 2
A highly flexible thin cylinder such as a plastic deck,
Inside it, as shown in Figure 2 (a) and (b),
A fixed portion 3 is fitted into the rotary drums 4 and 5 so as to be movable forward and backward. As shown in the figure, the rotating drums 4 and 5 have holes 4a and 5 through which the fixed member 3 moves forward and backward in the radial direction.
a is bored in its axial direction, and the fixed member 3 is biased radially inward by springs 6 and 7 interposed on the inner surfaces of the rotating trams 4 and 5, for example. Further, tapered surfaces 3a and 3b are formed in the axial direction on the inside of the holes 4a and 5a of the rotating drums 4 and 5 and both ends of the fixing part +43, and by suppressing the fixing member 3 in the axial direction with the rotating drum 4, This is to advance the fixing member 3 radially outward of the rotating drums 4 and 5 against the springs 5 and 6, and to integrate the rotating drums 4 and 5 with the flexible bobbin 2. Reference numeral 8 designates a transmission shaft for the rotating drums 4 and 5, and a presser foot 9 for moving the rotating drum 4 forward and backward in the axial direction is provided at its tip. The transmission shaft 8 of the rotating drum 4 is attached to and driven by a winder (not shown).

Note that power is transmitted between the rotating drum 4 and the transmission shaft 8 via a pin 10.

According to such a configuration, the pitch yarn cake 1 wound around the flexible bobbin 2 can be easily introduced into the infusibility furnace and subsequently into the carbonization furnace in the following manner.
□ First, insert the flexible bobbin 2 into the rotary drums 4 and 5,
The holding nut 9 is turned and the rotating drum 4 presses the fixing member 3 in the axial direction. As a result, an outward force acts on the tapered surfaces 3a and 3b of the fixed part +A3, which is biased and retracted by the springs 6 and 7, and the fixed member 3 is flexed against the springs 6 and 7. Press the inner surface of the sex bobbin 2. As a result, the flexible bobbin 2 and the rotating drum 4.5 are integrated, and by rotating the transmission shaft 8, the spun pitch yarn can be wound onto the flexible bobbin 2. Become. Therefore, the transmission shaft 8 attached to a winder (not shown) is driven to wind the spun pitch yarn 1a onto the flexible bobbin 2. When a predetermined pitch yarn 1a is wound up, the transmission shaft 8 is stopped, the presser nut 9 is turned, the rotary drum 4 is moved backward, and the axial pressure on the fixing member 3 is released.

The fixed member 3 retracts inward in the radial direction due to the elastic force of the spring 6, so that the flexible bobbin 2 and the rotating drums 4, 5
The integration with is canceled. Therefore, after removing the flexible bobbin 2 from the rotating drum 4.5, the flexible bobbin 2 is recessed as shown in FIG. The thread cake 1 is extracted, leaving only the pitch thread cake 1 as shown in FIG.

This is carried into an infusibility furnace and put therein for infusibility treatment. Thereafter, it is taken out from the infusibility furnace while maintaining this cake shape and subjected to carbonization treatment. Note that the pinch thread maintains its wound shape.

The three-dimensional shape and air permeability when rolled up are maintained, and heating and carbonization leading to infusibility are performed uniformly.

[Effects of the Invention] As can be seen from the following explanation, the present invention involves winding a pitch thread onto a flexible bobbin, deforming the bobbin, and pulling it out to make the bisodge thread independent in its cage shape. Therefore, the pitch yarn can be fed into an infusible furnace and a carbonization furnace as it is. Therefore, as explained in the prior art, the pitch yarn once wound is unraveled for the infusible treatment. There is no need for the trouble of placing the paper on a conveyor or the accompanying large-scale equipment. In addition, the pitch yarn has a three-dimensional shape and is compact, making it extremely easy to handle, making it possible to significantly downsize the infusibility furnace and making it convenient to collect the pitch yarn in each furnace and to transport it between furnaces. In addition, uniform heating of the pitch yarn passing through each furnace can be achieved.
It is possible to efficiently produce pitch-based carbon fiber of constant quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pitch yarn cake wound around a flexible bobbin and a rotating drum portion in which the method of the present invention is carried out, and FIG. 2(a) is a perspective view of a flexible bobbin fixed to a rotating drum and The axial cross-sectional view of the pitch yarn cake, Figure 2(b) is similar to the same figure (a).
), FIG. 3 is a diagram of the flexible bobbin in a deformed state, and FIG. 4 is the pitch yarn in the state before it is introduced into the infusibility furnace and the carbonization furnace. It is a perspective view of a cake. 1- Pitch yarn cake, ]a-=-pitch yarn, 2- Flexible bobbin patent applicant Kawasaki Heavy Industries, Ltd.

Claims (1)

[Claims] (1) In the M construction of pitch-based carbon fiber, the spun pitch yarn is wound around a flexible bobbin, and the flexible bobbin is deformed before the infusibility treatment to extract it from the wound pitch yarn; A method for introducing pitch yarn into an infusible furnace, which comprises introducing the wound pitch yarn into an infusible furnace or subsequently into a carbonization furnace.