EVA (Ethylene Vinyl Acetate Copolymer) film extruding machine adopting central processing unit to control feed rate

Abstract

The invention relates to an EVA (Ethylene Vinyl Acetate Copolymer) film extruding machine adopting a central processing unit to control the feed rate and belongs to the technical field of extrusion forming of plastic. The EVA film extruding machine comprises a main machine barrel, an extruding screw arranged in the main machine barrel and a driving motor used for driving the extruding screw to rotate, wherein a feed hopper is arranged at the feed end of the main machine barrel; the bottom of the feed hopper is a cone with a top facing down, and an opening is formed in the top of the cone; a die head is arranged at the discharge end of the main machine barrel; the bottom of the feed hopper is connected with an additional feed barrel; two impellers fixed on the same rotating shaft are arranged at the through opening, connected with the bottom of the feed hopper, of the additional feed barrel; a flow sensor for generating material flow information is arranged at an outlet of the die head; and an adjusting motor used for receiving the material flow information and then driving the two impellers to rotate forwards or backwards is arranged outside the feed hopper. The EVA film extruding machine has the advantages that the feeding of the extruding machine can be changed greatly within a short time and the requirement of fluctuation of molten resin is met.

Description

technical field [0001] The invention relates to an EVA film extruder, which belongs to the technical field of extrusion molding of plastics. Background technique [0002] At present, the encapsulation of solar cells generally adopts ethylene-vinyl acetate copolymer (EVA) film to encapsulate the solar cells, and glues them together 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, lamination device, trimming unit and winding equipment to complete mixing, feeding, extrusion, forming, trimming, Winding process. Among them, the extrusion equipment is the mai...

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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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