Polyacrylonitrile fiber steam drafting device and sealing method for the device

Abstract

The invention relates to a vapor pressure sealing device which is used to draft fiber vapor and in particular relates to the vapor pressure sealing device which is used to draft polyacrylonitrile fiber which is used to produce carbon fiber precursors with high performance and a sealing method for realizing the vapor pressure sealing device. Two ends of a water vapor drafting chamber adopt a high temperature gas sealing chamber whose pressure is same to that of the water vapor drafting chamber to connect, since the water vapor pressure and the temperature in the high temperature sealing chamber are same to the water vapor pressure and the temperature in the water vapor drafting chamber, great differences in the temperature and the pressure between the water vapor drafting and external interface are effectively reduced, temperature lowing and water vapor penetration and concentration can be effectively reduced, and thereby the temperature and the pressure in the water vapor drafting chamber can be effectively guaranteed.

Description

[0001] Field [0002] The invention relates to a steam pressure sealing device for fiber steam drawing, in particular to a steam pressure sealing device for polyacrylonitrile fiber drawing for producing high-performance carbon fiber precursors, and a sealing method for realizing the steam pressure sealing device. Background technique [0003] As a high-performance special fiber, carbon fiber is used in satellites, launch vehicles, tactical missiles, and aircraft. It can not only greatly reduce the structural weight, but also improve technical performance. It has become an indispensable material for aerospace vehicles. However, in order to prepare high-performance carbon fibers, polyacrylonitrile precursors with excellent properties must be produced. [0004] A key process in the production of polyacrylonitrile precursor is the steam drawing process. There are about 3 drafts in the whole process of polyacrylonitrile precursor fiber formation. The first time is drawing in the ...

AI Technical Summary

Problems solved by technology

Although this reduces the pressure drop on the steam chamber on the surface of the groove between the steam chambers to a certain extent, but because it only adds a steam chamber, there are still temperature differences and pressures between the normal temperature and pressure outside the steam chamber and the high temperature and high pressure inside the chamber. Poor, so steam leakage and temperature drop are unavoidable, so it is difficult to obtain a stable steam pressure, and it is impossible to guarantee the temperature and pressure required for steam drawing of polyacrylonitrile raw yarn

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