Agricultural film recovery dry-method granulation preparation technology

Abstract

The invention provides an agricultural film recovery dry-method granulation preparation technology with advantages of complete impurity removal, high product purity and no secondary pollution. The technology comprises the following steps: 1) fragmentation: recovering the waste and old agricultural films for primary fragmentation; 2) primary drying: placing the fragmented agricultural films in a low-temperature drying furnace for drying the agricultural films; 3) secondary drying: performing secondary drying on the agricultural film fragments through the primary drying; 4) vibration: during a drying process, performing vibration and screening the material simultaneously, promoting the separation of the agricultural film fragments and silt impurity; 5) electrostatic separation: performing electrostatic separation on the agricultural film fragments through twice vibration drying, separating the agricultural films and impurity with a finer manner; 6) secondary crushing: performing secondary crushing on the agricultural film fragments through the electrostatic separation to obtain the finer fragment; and 7) extrusion and granulation: fushing the agricultural film fragments obtained in the step 6), extruding the softened material, and cutting the extruded material to a granular shape.

Description

technical field [0001] The invention relates to the field of plastic granulation, in particular to a dry granulation preparation process for recycling agricultural film. Background technique [0002] The large-scale use of agricultural plastic films has caused increasingly serious environmental pollution, and the discarding and disposal of agricultural films has caused a series of environmental problems. Recycling granulation is the most economical and convenient method in the recycling of waste agricultural film. The demand for products is large, and it is the most important agricultural film recycling technology suitable for national conditions. [0003] Wet granulation is a relatively mature process commonly used at present. The regenerated granules have high purity and can be used as raw materials for high-quality plastic products. However, repeated crushing and cleaning lead to high operating costs, and after cleaning Sewage is easy to pollute the environment. The dry...

AI Technical Summary

Problems solved by technology

[0003] Wet granulation is a relatively mature process commonly used at present. The regenerated granules have high purity and can be used as raw materials for high-quality plastic products. However, repeated crushing and cleaning lead to high operating costs, and after cleaning Sewage is easy to pollute the environment

The dry granulation process is simple and the operating cost is low, but it is difficult to achieve a good impurity removal effect, so that the agricultural film entering the melt extrusion pelletizer still contains a large amount of impurities, causing serious wear and tear to the melt pelletizer; In addition, due to the presence of impurities, the purity of the product is reduced

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