Continuous microwave drying method and device of nanometer fiber membrane

Abstract

The invention provides a continuous microwave drying method of a nanometer fiber membrane. The continuous microwave drying method of the nanometer fiber membrane includes: guiding the nanometer fiber membrane which comprises, based on weight rate, less than 50% of moisture and less than 10% of organic solvent into a microwave drying device through multilevel guide rollers, and using microwave radiation to keep drying temperature in the microwave drying device at 100-120 degree centigrade for 1-5 minutes; using both a blower nozzle and an air outlet to discharge volatile components generated in the microwave drying device, and using the blower nozzle to dry residual trace moisture in the nanometer fiber membrane. The invention further provides the microwave drying device. According to the continuous microwave drying method and the microwave drying device of the nanometer fiber membrane, microwave drying technology and blast technology are combined, the nanometer fiber membrane can be continuously dried, and drying speed is high, energy consumption is low, and damage to the nanometer fiber membrane is small.

Description

technical field [0001] The invention relates to microwave drying, in particular to a continuous microwave drying method and equipment for nanofiber membranes. Background technique [0002] Drying is an important link in the preparation process of nanofibrous membranes. Not only the drying method and the selection of drying equipment directly affect the output and quality of nanofiber membranes, but also have a great impact on the consumption of manpower, material resources and energy in the drying process. [0003] So far, in the drying process of nanofibrous films containing moisture or solvents, a simple blast-baking method has been used. However, in the blast baking method, since the volatilization of moisture or solvent is very sensitive to temperature, problems such as fluctuations in film thickness, edge curling, and even film cracking are likely to occur. [0004] The microwave drying method is a new type of drying method, which was developed in the 1960s. It uses t...

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Problems solved by technology

[0005] However, in the process of microwave drying, the water content has a great influence on the drying efficiency. On the one hand, because water has a strong absorption of microwaves, the efficiency of converting microwave energy into heat energy is high. The more fully the absorption, the faster the microwave heating rate, and the material can reach a very high temperature in a short time, and the drying efficiency is higher at this time; on the other hand, in the continuous production equipment, in order to prevent microwave leakage, the openings and exhaust The air port is small, and a microwave suppressor is installed, which makes the ventilation capacity of the equipment poor. If the dried material or the moisture in the equipment cannot be removed in time, it is easy to cause local overheating in the material or somewhere in the equipment, which will affect the performance of the material and cause damage to the equipment. Hidden dangers for production

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