EVA (ethylene-vinyl acetate) adhesive film recovery granulator

Abstract

The invention relates to an EVA (ethylene-vinyl acetate) adhesive film recovery granulator and solves the problems of insufficient mixing and incomplete exhausting in a low-temperature melting process for EVA adhesive film recovery. The EVA adhesive film recovery granulator is characterized in that first helical blades are arranged on a screw; the part between a feeding end and an extruding end of the screw is divided into a melting section, a shunting section, a compressing section, a shearing section, a plasticizing and refining section and a homogenizing section sequentially; the height of blades at the shunting section of the screw is reduced gradually; the height of blades at the plasticizing and refining section of the screw is larger than the height of blades at the shearing section and the height of blades at the homogenizing section and is changed uniformly and transitionally in the connecting position of the shearing section and the homogenizing section; exhaust ports are correspondingly formed in a screw sleeve at the tail end of the shunting section and in the middle of the plasticizing and refining section. According to the height change of the screw blades, materials are extruded sufficiently in the radial direction in a conveying process, the heat exchange efficiency is improved, and the melting mixing effect is improved; the shunting section is provided with a structure of second helical blades, the materials are extruded at multiple angles in multiple directions in combination of the height change of the blades, and air bubbles are exhausted sufficiently.

Description

technical field [0001] The invention relates to an extrusion granulation equipment, in particular to an EVA film recycling and granulation machine which uses EVA solar film as a raw material for recycling and granulation. Background technique [0002] EVA solar adhesive film is a thermosetting adhesive film for placing in the middle of laminated glass (EVA is the abbreviation of Ethylene Vinyl Vinyl Acetate). Due to the superiority of EVA film in terms of adhesion, durability, and optical properties, it is more and more widely used in current components and various optical products. Defective products in the production of photovoltaic modules and the EVA film on discarded photovoltaic panels can usually only be treated as waste products, resulting in great waste. EVA film has strict requirements on the number and size of air bubbles per unit area. For secondary use of EVA film, if the melting temperature is too high, the material will be denatured and aged, making it diffic...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of insufficient mixing and incomplete exhaust in the low-temperature melting process of EVA film recycling, and provide an EVA film recovery granulator that can be fully extruded from multiple directions to improve the mixing and exhaust effects

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