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

A pulp molding, frequency conversion speed regulation technology, applied in drying, dryer, drying gas layout and other directions, can solve the problems of large energy waste, short drying time, high scrap rate, reduce energy consumption and material consumption, The effect of improving production efficiency and saving power consumption

Inactive Publication Date: 2008-12-24
GUANGDONG UNIV OF TECH
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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 i

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

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Embodiment Construction

[0033] Pulp molded products contain relatively high moisture (about 70%) after molding, which needs to be removed through a drying process. The moisture content of the finished product after drying is about 10%-15%. There are three forms of water in wet paper fibers: bound water, adsorbed water and free water, and the purpose of drying pulp molded products is to remove bound water and adsorbed water. Pulp molding products are porous media with moisture, and their drying characteristics are relatively complicated. The overall drying process can be divided into three stages: preheating drying, constant speed drying, and reduced speed drying. Usually the duration of the preheating drying stage is relatively short and can be ignored. In the constant-speed drying stage, the wet paper base absorbs heat from the drying medium (hot air), causing the internal moisture to diffuse outward under the pressure gradient, while the surface moisture evaporates into water vapor, which is taken ...

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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...

Claims

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Application Information

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IPC IPC(8): F26B15/14F26B21/08G05B19/05G05D27/02
Inventor 程良伦伦永亮刘洪涛林钟楷
Owner GUANGDONG UNIV OF TECH
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