Automation Control Cast Film Extrusion Line For Making EVA Solar Battery Film

EVA Solar Usage Functional Film Compounding Extrusion Casting Forming Production Line

Application:

EVA Solar battery film is applied in upper and lower envelopes from the photovoltaic module and hot pressing for upper glass and lower back plate, which made up the solar panels. To ensure stable and be efficiently used for the assemblies, high transmittance, vapor prevention and dust penetration, high and low temperature resistance, anti-ultraviolet radiation and other functions are required.

Producing process:

Using EVA (VA content is 30-33%) as base material, adding crosslinking agent, ultraviolet absorbent, antioxidant, ultraviolet stabilizer, plasticizer, tackifier, etc. by extrusion casting forming film final product. The main process is listed below:

Raw material mixing and feeding → Evenly melted and extruded → T Die → Casting forming and cooling shaping → Tempering and cooling finalization → Traction and winding → Follow-up slitting device

1. Fully automatic raw material transition, mixing and feeding system, guaranty the high precise proportioning for the EVA polymer resin and additives.

2. Special low temperature extrusion system design, preventing additives pre-curing crosslinking on premise of fully compounding effect.

3. Special design of the casting forming system, solving the problem of material sticking on the rollers and peeling difficulty.

4. Unique on-line tempering stress removal device to eliminate film stress and reduce shrinkage rate.

5. For high-end solar battery film usage, two layers co-extrusion an be applied. This method can provide evenly distributed EVA polymer resin and additives with upper layer of anti-ultraviolet and anti-aging function, while lower layer of crosslinking weatherability.

The core extruder equipment includes parallel twin screw compounding extruder, reciprocating

compounding kneader, double rotor compounding extruder, SCP high viscosity self cleaning

reactor and large capacity devolatilizer, etc.

At the same time, based on the above main extruder, the design and manufacture of a

complete set of compounding pelletizing production line equipment and compounding

extrusion forming production line equipment can be realized. It is mainly used in the fields

of engineering plastics, modified plastics, wire and cable materials, rubber, packaging,

building medical chemical industry, chemical fiber textile, household appliance and other

industries (see the application case for details).

The existing factory area of the company is 46500 m2 (of which the parent company is

38000m2, and the subsidiary (Nanjing Cenmen) is 8500m2), The core parts and system

of the extruder are designed and manufactured by the company, such as barrel, screw,

gear box, etc. The company has advanced NC machining center, NC screw grinder,

CNC machine tool and other machining equipment. Equipped with Swiss imported

three-coordinate detector and Japanese imported spectral detector and other

advanced inspection and testing equipment. There are complete quality control means

and system from processing to testing, which fully ensure the stability and reliability of

product quality.

The extruders produced by Cenmen company are exported to nearly 40 countries, such as

Germany, Russia, belarus, Japan, Korea, Israel, Ukraine, magiddon, Iran, Thailand, Indonesia,

Brazil, India, Mexico, South Africa, etc.