EVA POE solar film production line

Our EVA/POE film extrusion lines can produce solar cell encapsulation films with lower shrinkage. GWELL can supply a complete line from the feed to the calibration system. The EVA packaging film production line of our GWELL Machinery is in a monopoly global leading position.

Product processing

After the plastic is melted, it is coated and compounded at a high speed with a series of paper, kraft paper, non-woven fabric, aluminum foil, interlining, etc. in a high-temperature melting state to achieve ideal tensile strength, compactness, barrier properties, and improve the moisture resistance of the material.

Advantage

• Using double-station automatic rewinding and rewinding device
• Magnetic powder tension design
• Constant tension control
• The production acceleration and deceleration can be controlled by the synchronization ratio
• Online waste recycling system
• The speed can reach 50m/min, 100m/min, 150m/min.

Components and Description

Mainly screw extruder: the extruder adopts the special screw design of the company’s laminating machine. Its characteristics are low calorific value, good plasticization, and it is an excellent product of PP/PE material. Screw diameter: φ9 0 Aspect ratio: 3 2: 1 Structure: single screw Heating power: 40 KW. Reducer: Hard tooth surface made of alloy steel after repeated heat treatment. The tooth surface is specially ground, running smoothly, with low noise, and circulating cooling device. Host: Siemens motor, rated power: 90KW host, frequency conversion: ABB inverter.

1. Single-board single-station filter

After the filter plate is produced for a period of time, the plastic melt enters the flow channel, and the mesh should be replaced when a predetermined pressure difference is formed. During the net changing work, the hydraulic system pushes the plunger to move correspondingly, prompting the filter plate to withdraw from the working position, and at the same time another filter plate enters the working position, and the protective cover is opened when the movement is stopped. Use a tool to quickly clean the melt around gates and filter holes, remove the old filter, replace with a new one, and you’re done. The machine is equipped with a pressure sensor and display in front of the net to monitor the clogging of the filter and ensure timely net change.

2. Solution static mixer

The energy-saving static mixer has a special structure of mixing elements, consisting of a plurality of intersecting steel bars (rods) arranged at right angles, separated by an angle of 45 degrees, so that the flowing melt is divided into multiple strands. Second-rate. The orientation is changed to further promote uniform dispersion and plasticization of the melt. It is usually used in extruders where very high precision is required.

3. Laminate composite molding system

High forming cooling capacity and excellent temperature uniformity result in films with small roll non-uniformity and uniform thickness. High-speed and stable operation is possible because the roll surface is molded and precision-machined.

4. Double station unwinding system

The structure adopts double-station servo unwinding device, which has high stability and mobility. The unevenness is small, and a very stable unwinding tension can be obtained.

Fully automatic continuous weighing and feeding system

The system not only maintains accurate feeding continuously, but also has the flexibility to change formulations according to market demands or technology upgrades.

An intelligent and precise feeding system is a good start for a high-quality product.

Single Screw Extrusion System

Single screw extruder direct extrusion technology is one of the most important features of this production line. The successful application of single screw extruder makes the online compounding of EVA/POE resin and various additives a reality.

This meaningful improvement is the result of our deep understanding and extensive practice with single-screw extruders. This innovation not only has technical advantages but also greatly reduces operating costs.

The excellent mixing effect of the single screw extruder plays a leading role in the production of EVA/POE films because it involves a large number of additives and requires good compounding.

Unique screw elements and screw profiles are designed according to the physicochemical properties of the EVA/POE resin. It keeps each ingredient homogeneously mixed while avoiding pre-crosslinking. It is also the basis for high productivity.

Special cooling and rolling design

The special cooling channel of the calender keeps the temperature of the calender surface uniform. A special silicon-coated calender can effectively remove the stress of the EVA/POE film, thereby significantly reducing shrinkage.

The gear pump made in Germany is used to ensure that the melt enters the die head, and the quantitative and pressure are stable. Closed-loop intelligence keeps the system running stably.

 Calibration system

The unique T-die for EVA/POE is designed according to the extrusion rheology of solar cell grade EVA/POE resin to ensure stable extrusion at low temperature.

This is one of the conditions that guarantees low shrinkage and high light transmittance.

EVA POE solar film extrusion line automatic online thickness gauge records and reports thickness in time. The automatic constant tension winding system is designed with reference to the mechanical properties of EVA film. Less marginal waste and high yield are derived from the continuous optimization of each unit in long-term production practice. These optimizations help reduce operating costs significantly.

Intelligent control system

From relays to industrial computers, we have more options. The logic setting between each function module makes precise control easy. Safer production is the result of well-thought-out mechanical and electrical protection. Precise synchronization and coordinated control of each unit guarantees a high-quality end product.