JPS6249365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to the use of pitch fibers of various types such as petroleum-based, coal-based, and polymer fired-based fibers that can be spun from a spinning nozzle to form continuous filament carbon fibers. The present invention relates to a method for applying a sizing agent to pitch fibers which are weak and have poor flexibility, and a method for applying a sizing agent to carry out the method.

(Prior art) Conventionally, pitch fibers spun from a spinning nozzle are
In order to bundle the filament and prevent yarn breakage and winding around guide members, etc., and to improve the unwinding properties of the wound fiber yarn, a binding agent (water, surfactant aqueous solution, etc., polyvinyl alcohol, etc.) is used. The oiling roller method However, when a sizing agent was applied using a spray nozzle method, the fragile pitch fibers would break or break, causing problems in subsequent processing.

(Object of the Invention) The present invention was made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a method and device for applying a sizing agent that does not cause breakage or breakage of fragile pitch fibers. do.

(Structure of the Invention) In the present invention, this purpose is achieved by injecting a sizing agent into an introduction chamber using compressed air and atomizing it, and then introducing the atomized sizing agent into a dispersion chamber provided in communication with the introduction chamber. This is achieved by applying the sizing agent to the pitch fibers while preventing the pitch fibers from directly acting on the pitch fibers by the compressed air jet of the sizing agent. Further, the present invention provides an introduction chamber provided with a spray nozzle for spraying and introducing a sizing agent for carrying out this method, and a dispersion chamber provided with a pitch fiber inlet and an outlet. A sizing agent applying device is provided that includes a box that communicates with a communication portion in a direction substantially perpendicular to the injection direction.

(Description of Embodiments) The present invention will now be described in detail with reference to the accompanying drawings, which illustrate embodiments of the invention. The drawing is a front view of an embodiment of the present invention, and numeral 1 shows a box in which a sizing agent is sprayed in the form of a mist in the interior space. The internal space of this box 1 communicates with an introduction chamber 5 into which the focusing liquid introduced into the pipe 2 is injected and introduced from the spray nozzle 4 by the airflow of compressed air introduced into the pipe 3. , and a dispersion chamber 6 which is filled with atomized sizing agent in an introduction chamber 5 and adheres the sizing agent in the form of a mist to pitch fibers passing through a fiber inlet and an outlet. In this case, in order to prevent the jet flow of compressed air of the sizing agent injected into the introduction chamber 5 by the spray nozzle 4 from directly acting on the pitch fibers passing through the spraying chamber 6, the sizing agent by the spray nozzle 4 is The introduction chamber 5 and the dispersion chamber 6 are communicated with each other through a communication section substantially perpendicular to the injection direction. spray nozzle 4
It is preferable that the focusing liquid sprayed from the introduction chamber 5 is made to collide with the bottom or inside of the introduction chamber 5 to be atomized. Reference numeral 7 denotes a pipe for collecting the residual sizing agent into a tank 8, which communicates with the bottom of the box 1. The pitch fiber 10 melt-spun from the spinning nozzle 9 is passed through the suction nozzle 1.
1, passes through the scattering chamber 6 of box 1 through the pitch fiber inlet and outlet,
After the atomized sizing agent 12 is applied, it is wound up by a winder 13. Reference numeral 14 denotes a metering and sizing agent application device, which re-applies a predetermined amount of sizing agent sent by a pump (not shown) through holes 15 to the fibers 10 to which the atomized sizing agent has been applied. The concentration and filling degree of the atomized sizing agent 12 in the box 1 can be adjusted to some extent by adjusting the amount sprayed from the spray nozzle 4, but the amount adjustment of the atomized sizing agent 12 is unstable and The quantity may be insufficient. Therefore, a metering and sizing agent application device 14 is used to stably adjust the amount of sizing agent 12 and ensure the absolute amount.

Incidentally, pitch as used in the present invention includes pitch produced by-product in various organic synthetic chemical industries and petrochemical industries, or pitch obtained by dry distillation of synthetic resins or natural resins, as well as tar,
Residual oils, etc. that have been modified by means such as solvent extraction, heat treatment, and distillation, especially for the purpose of making carbon fibers, and flexible resinous substances such as resinous substances obtained by condensing benzachloride and naphthalene. Contains fragile substances with poor properties.

(Effect of the invention) In the present invention, the introduction chamber for atomizing the sizing agent and the dispersion chamber for applying the atomized sizing agent to the pitch fibers are separate, so that the jet flow of the sizing agent does not directly act on the pitch fibers. This prevents breakage and breakage of the fragile pitch fibers, making it possible to perform subsequent processing such as high-speed winding. In addition, since the sizing agent is applied once in the previous step, the pitch fibers will not break or break even if the sizing agent is applied by a metered amount using a spray nozzle method, an oiling roller method, etc.

[Brief explanation of the drawing]

The drawing is a front view of an embodiment of the invention. 1...Box, 4...Spray nozzle, 5...
...Introduction chamber, 6...Scattering room, 9...Spinning nozzle, 1
0... Pitch fiber, 13... Winding machine, 14... Measuring sizing agent applying device.

Claims (1)

[Scope of Claims] 1. When applying a sizing agent to pitch fibers melt-spun from a spinning nozzle, the sizing agent is injected into an introduction chamber with compressed air to atomize it, and then the atomized sizing agent is The pitch fibers are introduced into a dispersion chamber that is connected to the introduction chamber, and passed through the dispersion chamber to apply the sizing agent to the pitch fibers while preventing the compressed air jet of the sizing agent from directly acting on the pitch fibers. A method for applying a sizing agent, characterized by: 2. In an apparatus for applying a sizing agent to pitch fibers melt-spun by a spinning nozzle, an introduction chamber provided with a spray nozzle for spraying and introducing the sizing agent, and a dispersion chamber provided with a pitch fiber inlet and an outlet are arranged as described above. A sizing agent applying device comprising a box that communicates with a communication portion in a direction substantially perpendicular to the direction in which the sizing agent is sprayed by a spray nozzle.