Method and device for drying material in vacuum

Abstract

The invention relates to a closed-type plastic vacuum dehumidification device formed by vertically stacking and integrating an upper workroom and a middle workroom which both have different functions. The method comprises the following steps: pumping air heated to a drying temperature into the upper workroom to heat plastic colloidal particles which are moved to the middle workroom to be vacuumized and dehumidified when reaching the drying temperature; and switching on a valve to communicate the upper workroom and the middle workroom to convey materials, wherein either workroom independently finishes self working procedures when the valve is switched off. Particularly, the lower part of the middle workroom is provided with a lower workroom as a storage workroom of the drying materials, and the three workrooms with different functions are vertically stacked and integrated. The invention has simple and reliable structure and very low operation energy consumption, and the material vacuum dehumidification device is formed by vertical stacking integration so as to have small floor area, compact structure and good sealing performance, and the workrooms are vertically connected together and are fully isolated from the outside so that the material conversion function is finished in a relatively closed environment.

Description

technical field [0001] The invention relates to a material drying method and device, in particular to a closed vacuum drying method and device for plastic granules. Background technique [0002] Drying of plastics is essential for every plastics processor in order to produce high-quality products. The increase of water content will gradually reduce the shear viscosity of the material. Too long a dwell time will cause the residual moisture content to be too low and cause an increase in viscosity, which will lead to insufficient mold filling and also cause yellowing of the material. In addition, changes in mechanical properties and dielectric strength can only be found by performing relevant tests on materials. Choosing a reasonable drying technology can help save costs and reduce energy consumption. [0003] Convection drying uses a drying gas generator to dry materials. The plant is centered around an adsorptive dryer consisting of two molecular sieves to produce the ene...

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Problems solved by technology

[0005] However, there is still room for improvement for the above-mentioned Maguire equipment: the main reason is that when the machine is working, three cavities are required for rotation and transposition. Before rotation, the upper and lower compression sealing devices must be loosened, and the materials must be exposed to the outside air during the transposition process. , polluted by the outside air, resulting in changes in temperature and humidity, reducing the dehumidification efficiency, the vacuum sealing device is prone to failure, relatively high energy consumption, and complicated operation control

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