Carbon fiber spinning assembly and bottom spinneret plate cleaning method

Abstract

The invention discloses a carbon fiber spinning assembly and bottom spinneret plate cleaning method, comprising the following steps: after a spinning machine conducts high-temperature melt spinning, introducing asphalt or resin with low softening points into a spinning machine box to completely fill a carbon fiber spinning assembly and a bottom spinneret plate; discharging the asphalt or the resinin the carbon fiber spinning assembly and the bottom spinneret plate through high-temperature and high-purity nitrogen; detaching the carbon fiber spinning assembly and the bottom spinneret plate from the spinning machine box and cooling them; carrying out vacuum high-temperature calcination on the carbon fiber spinning assembly and the bottom spinneret plate; primarily flushing the carbon fiberspinning assembly and the bottom spinneret plate by a high-pressure air gun; cleaning the carbon fiber spinning assembly and the bottom spinneret plate through ultrasonic vibration; and secondarily flushing the carbon fiber spinning assembly and the bottom spinneret plate through the high-pressure air gun. According to the method, the carbon fiber assembly and the bottom spinneret plate can be efficiently cleaned, so that the spinning assembly and spinneret orifices are smooth and clean, and certain precision and dimensional stability are kept.

Description

technical field [0001] The invention relates to the field of cleaning carbon fiber spinning equipment, in particular to a cleaning method for a carbon fiber spinning assembly and a bottom spinneret. Background technique [0002] The component and the bottom spinneret are one of the most important components of the spinning part. During the spinning process, the viscous polymer becomes a fine fluid with a specific cross-section through the spinning component and the bottom spinneret, and then passes through the spinning part and the bottom spinneret. Stretching, condensation and solidification into filaments. After spinning, the inner cavity of the spinning assembly and the spinneret holes on the bottom spinneret will be filled with spinning raw materials. The commonly used cleaning methods for existing spinning components and bottom spinnerets are divided into physical and chemical methods, such as high-temperature incineration, fluidized bed, salting out, dissolution, ultr...

AI Technical Summary

Problems solved by technology

The process of cleaning the spinneret at the bottom of this method is complicated, consumes water, electricity and time, and produces biphenyl-biphenyl ether waste liquid which is difficult to handle

This method is only suitable for cleaning the bottom spinneret of polyphenylene sulfide melt spinning, and cannot be applied to the cleaning of carbon fiber spinning components and bottom spinneret

[0006] None of the above patents reduces the spinning raw material residues in the spinning assembly and the bottom spinneret in the late stage of spinning in advance, so cleaning the bottom spinneret after spinning requires many processes, takes a long time, and is difficult to clean.

[0007] The softening point of carbon fiber raw materials is relatively high. For example, the softening point of heat-sensitive naphthalene-based synthetic pitch is 280-300°C. The temperature range of the spinning assembly and the bottom spinneret is 300-350°C. There is no suitable solvent for the time being. It cannot be cleaned by dissolution method, and the conventional high-temperature incineration method directly after spinning carbon fiber requires an incineration temperature as high as 450-500°C, which will greatly damage the outer coating and dimensional stability of the spinning assembly and the bottom spinneret