Working method of eva film extruder with fast feeding adjustment function

Abstract

The invention relates to a working method of an EVA adhesive film extruder with a rapid feeding adjustment function. The EVA adhesive film extruder comprises a main unit cylinder, an extrusion screw arranged in the main unit cylinder, and a drive motor used for driving the extrusion screw to rotate, wherein a feeding hopper is arranged at a feeding end of the main unit cylinder; the bottom of the feeding hopper is produced to be in the shape of a cone with a downward cone top and provided with an opening located at the cone top; a die head is arranged at a discharge end of the main unit cylinder; two impeller wheels fixed on the same rotary shaft are arranged at the opening of the feeding hopper; a flow sensor used for generating material flow information is arranged at an outlet of the die head; and an adjustment motor used for receiving the material flow information and then driving the two impeller wheels to positively or reversely rotate is arranged outside the feeding hopper. The EVA adhesive film extruder has the advantages of greatly changing feeding for the extruder in a short time and adapting to requirements on molten resin production fluctuations.

Description

technical field [0001] The invention relates to a working method of an EVA film extruder, belonging to the technical field of plastic extrusion molding. Background technique [0002] At present, the encapsulation of solar cells generally adopts ethylene-vinyl acetate copolymer (EVA) film to enclose the solar cells, and bond them with upper and lower protective materials to form a solar cell module. EVA is a typical random polymer compound. It has good wettability when heated and melted, and good flexibility, stress crack resistance and bonding performance when cooled and solidified. It is an ideal energy-saving material. materials for solar cell packaging. [0003] EVA film forming adopts extrusion molding process. The whole production line usually includes mixing equipment, extrusion equipment, film lamination device, trimming unit and winding equipment to complete mixing, feeding, extrusion, forming, trimming, Winding process. Among them, the extrusion equipment is the ...

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Problems solved by technology

[0004] The applicant found that feeding the extruder through the hopper mainly feeds the extruder through the gravity of the material in the hopper, and the fluctuation of the feeding is small, so it is not suitable for a large change in the function of feeding the extruder in a short period of time. , cannot adapt to the requirements of fluctuations in molten resin production

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