Aramid fiber high-temperature forming machine

Abstract

The invention discloses an aramid fiber high-temperature forming machine. The machine comprises a screen conveying mechanism, a fiber guide mechanism, a heating mechanism, a temperature controlling and retaining system, a nitrogen circulation and control mechanism, a stander and the like, wherein an electric screen roller drives a screen conveying belt and a screen driven wheel; the screen conveying belt moves on a horizontally arranged bracket; an inlet end and an outlet end are provided with a fiber guide plate and a fiber outlet roller; an outlet end of a fan is connected with a heater and is connected with a temperature equalizer above the screen conveying belt through a pipeline; a temperature buffer below the conveying belt is connected with an inlet end of the fan through a pipeline; a heat-insulating plate is arranged on the inner side of an inner box body; the two ends of the inner box body are provided with air curtains; a plurality of temperature sensors are arranged in the box body and connected with a temperature controller; a nitrogen generator is connected with the outlet end of the fan through a control valve; and the inner box body is embedded in a box body shell and is supported by a plurality of adjustable machine legs. The machine can meet the technical requirements on high-temperature thermal forming in a strand loose state during production of aramid fiber and saves energy.

Description

technical field [0001] The invention relates to a heat-setting device for ultra-strong polymer fibers in the chemical fiber industry, in particular to an aramid high-temperature setting machine. Background technique [0002] At present, the application of high-performance fibers in all walks of life is becoming more and more popular, and the impact on the national economy is also becoming more and more significant. As a representative of super strong polymer fibers, aramid has excellent heat resistance and flame retardancy, electrical insulation and good textile performance, and has become an important raw material for advanced protective materials and structural materials. In the production process of aramid fiber, the loose high-temperature setting of tow is the key process to improve the comprehensive performance of aramid fiber products. According to the data, the current domestic aramid fiber production line has not yet been equipped with a relaxation-type setting proc...

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Problems solved by technology

According to the data, the current domestic aramid fiber production line has not yet been equipped with a relaxation-type setting process. The main reason is that the maximum setting temperature of various domestic relaxation-type heat setting machines is 260 ° C, while the setting temperature of aramid fiber is required to be At around 400°C, there is currently no high-temperature setting machine with a relaxation setting temperature exceeding 260°C; the existing setting equipment using steam heating has a maximum temperature of no more than 200°C, which cannot meet the requirements of the aramid fiber setting process. The sizing equipment using circular electric heating tubes can reach the heat-setting temperature of aramid fiber tow, but the circulating air generated by the heat circulation fan in the box will blow the tow away, which cannot realize the high-temperature loose sizing process of aramid fiber It is necessary to ensure that the aramid tow is not dispersed; the limit temperature of the conveyor belt of the current loose sizing machine is 260 ° C, which cannot meet the high temperature requirement of 400 ° C for aramid production; aramid production has higher requirements for temperature uniformity Generally, it is necessary to ensure ±1°C. The existing heat setting machine has the phenomenon that the heat in the box can leak from the entrance and exit of the tow, resulting in a large difference between the temperature on the front and rear sides of the box and the temperature in the middle, and the temperature cannot reach the temperature. Requirements for loose high-temperature heat setting of fiber tow; the surface of aramid fiber is easily oxidized at about 400°C, resulting in differences in the color of the tow. The current loose heat setting process cannot meet the requirements of aramid fiber production

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