Multi-Layer EVOH Cast Film Co-Extrusion Line

Highly Efficient GWELL Cast Film Line and its Key Components

Advanced Gravimetric Feeding System

In the cutting-edge GWELL cast film line, the gravimetric feeding system optimizes material input through precise weight control, not volume. This advanced system boasts an accuracy error margin of ±0.5%, significantly superior to traditional volumetric feeding. Its specialty in efficient online blending of various composite materials is a standout feature.

The system's specially designed anti-melting technology is crucial when processing low-melting materials or fine granules. By incorporating vibration and cooling mechanisms in feed hoppers, the system prevents premature pellet melting, ensuring moisture-free material supply to avoid "fish eyes" in the final film. Integrated drying unit options further elevate this system's sophistication and efficiency.

Powerful Extruder

The GWELL cast film line's extruder is engineered to melt plastic pellets and blend into a uniform melt. This process is facilitated through a rotating screw in a heated barrel. With barrel diameters ranging from 3½ inches (90 mm) to 6 inches (150 mm), and screw length to diameter (L/D) ratios typically between 26:1 and 30:1, it's tailored for various materials and process demands.

Ensuring stable and precise control of extruder outlet flow and screw speed (with an error margin not exceeding ±1%) is critical. Unstable flow control leads to variations in film thickness, impacting product quality.

Innovatively, the incorporation of a melt pump stabilizes flow from the extruder and significantly reduces energy consumption and wear.

High-Performance Filtration System

The filtration system in this production line aims to prevent impurities and gels from passing through, ensuring the purity of molten substances. Its features include metal mesh filters and housings capable of withstanding high pressures. The use of continuous screen changers significantly minimizes screen pack replacement time, enhancing efficiency.

Innovative Flat Die System

As the heart of any coextrusion line, GWELL's flat die system emphasizes uniform multi-layer film distribution and thickness control (total thickness variation not exceeding ±2.5%, and ±15 to ±20% for each layer).

Moreover, the perfect synergy between the die and coextrusion module is key to ensuring high-quality products. Latest die technologies, including internal deckles and edge encapsulation, further enhance line efficiency and material utilization.

Efficient Cooling Unit and Automatic Gauge Control System

The cooling unit and automatic gauge control system (APC) are integral parts of the GWELL cast film line. The cooling unit achieves efficient film cooling through chrome-plated rollers, while the advanced APC precisely regulates film thickness through radiation units and control consoles, significantly enhancing product quality.

Innovative Surface Treatment Technology and Advanced Winders

The innovative corona treatment technology improves ink or coating adhesion on the film surface. Lastly, winding technologies like surface winders, center winders, or center/surface winders are selected based on film characteristics and dimensions, ensuring film integrity and dimensional accuracy.

Integrated Computer Monitoring and Control System

All key components of the entire GWELL cast film line are integrated under a computer monitoring and control system. This system ensures efficient start-up, shutdown, speed control, material weight, temperature control, web tension adjustment, and accurate interaction between the APC and automatic die.