Dynamic interactive vacuum low-temperature non-woven fabric dehydration method

Abstract

The invention relates to a dynamic interactive vacuum low-temperature non-woven fabric dehydration method. The method comprises the following steps that a mask stock solution is atomized through a spraying tunnel, and is uniformly sprayed on non-woven mask cloth; and the non-woven mask cloth covered with the mask liquid is freeze-dried on a freeze-drying tunnel, and water in the mask liquid on thenon-woven mask cloth is sublimated and removed in the freeze-drying tunnel. According to the dynamic interactive vacuum low-temperature non-woven fabric dehydration method, the non-woven fabric is dewatered in a multi-section vacuum low-temperature mode, the mask liquid is condensed at the low temperature, meanwhile, the pressure is reduced, the boiling point of water is changed, the water in themask liquid is sublimated and pumped away, and therefore liquefaction of the mask liquid during water sublimation is avoided; and it is guaranteed that the non-woven fabric is not crystallized afterdehydration, the water content of the non-woven fabric after dehydration is reduced, and the freeze-drying effect of the non-woven fabric is improved.

Description

technical field [0001] The invention relates to the technical field of low-temperature dehydration, in particular to a dynamic interactive vacuum low-temperature non-woven fabric dehydration method. Background technique [0002] The essence of dehydration is to remove water, and vacuum freeze-drying uses sublimation to heat the material in a vacuum to generate steam and remove it to achieve dehydration. Freezing generally needs to be carried out below 0°C. [0003] In order to sublimate and remove the frozen solid water, the material after vacuum freeze-drying needs to be heated to sublimate the solid water, and the sublimation of the solid water generates steam to increase the partial pressure of the steam, and the temperature of the material also increases accordingly. Usually, when sublimated, When the whole material rises to a temperature above 0°C, the ice crystals of the material will melt, and the freeze-drying will not continue. Therefore, this freeze-drying dehydrat...

AI Technical Summary

Problems solved by technology

[0003] In order to sublimate and remove the frozen solid water, the material after vacuum freeze-drying needs to be heated to sublimate the solid water, and the sublimation of the solid water generates steam to increase the partial pressure of the steam, and the temperature of the material also increases accordingly. Usually, when sublimated, When the whole material rises to a temperature above 0°C, the ice crystals of the material will melt, and the freeze-drying cannot continue. Therefore, this freeze-drying dehydration method has a long drying process and incomplete removal of product moisture, which affects the drying effect of the overall material and is not conducive to Drying and dehydration of materials sensitive to normal temperature