Paper pulp molding drying line based on variable-frequency control technique and preparing process thereof

Abstract

The invention discloses a drying line of pulp moulding that is based on a frequency-varying speed regulation technique, and a production technique of the drying line, and is applied into a belt drying line with convectional hot air and used for designing a set of automatic controlling systems with optimized efficiency; the invention implements the modeling of complex objects according to the drying property of pulp moulding and different sizes and weights of wet ground papers, adopts a process control technique, the alternate-current frequency-varying speed regulation technique and a modern detecting technique, realizes stepless control of frequency-varying speed regulation of a circulating fan, an electric air door, a dehumidifying fan, a drive motor of conveying chains according to temperature and humidity signal that are detected on the spot, reasonably adjusts the running speed of a conveying belt inside a parching channel, the working temperature of a desiccator in each segment, and the blast volume of hot air and the discharge of water vapor, etc., and forms a reasonable drying curve, thus reducing product deformation to the utmost degree, saving the loss of electricity energy and heat energy to the utmost extent, accelerating parching speed, increasing the yield of the parching production line, and realizing optimal control.

Description

technical field [0001] The invention relates to a pulp molding drying line based on frequency conversion and speed regulation technology and a production process thereof. Background technique [0002] Pulp molded products are considered to be the best substitute for EPS white pollution packaging products, and are called "green packaging in the 21st century". The production process of pulp molded products is: pulping, vacuum forming, drying, hot pressing and shaping. First, combine waste paper balls or raw pulp boards with a certain proportion of water, put them into a hydropulper, and use hydraulic action to crush and decompose at a high speed, so that paper fibers are mixed in water to form a slurry that meets certain requirements. Then, through the method of vacuum adsorption, the slurry is evenly distributed on the forming mold, further dehydrated, and demoulded, and the wet paper base is basically formed at this time. However, the formed wet paper base contains relativ...

AI Technical Summary

Problems solved by technology

Moreover, the adjustment of the air door opening of the traditional drying line is manually operated, which cannot make adaptive adjustments in time according to changes in system parameters, and does not set the optimal work for the drying characteristics of pulp molded products in different drying stages. The curve is controlled in sections, and the system has serious randomness and blindness, resulting in too short or too long drying time, serious product deformation, large energy waste, low drying efficiency, high scrap rate and other restrictive factors

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