Cast film double column hydraulic screen changer

The Cast Film Double-Column Hydraulic Extrusion Screen Changer is a specialized screen-changing equipment designed for cast film production lines. Its main features and advantages are as follows:

I. Structural Composition

The Cast Film Double-Column Hydraulic Screen Changer primarily consists of columns, the main body, hydraulic cylinders, perforated plates (screen filters), safety shields, and other components. This screen changer employs a dual-column, dual-flow channel design, with each flow channel equipped with a screen filter to enable simultaneous operation of both screens.

II. Working Principle

During the cast film production process, the double-column hydraulic screen changer achieves non-stop screen changing through the following steps:

Simultaneous Operation of Dual Screens: Under normal conditions, both screen filters work concurrently, allowing the melt (such as plastic melt) to pass through them into the next production stage.

Alternating Screen Changing: When impurities accumulate to a certain extent on one of the screen filters, requiring replacement, the hydraulic station or other power mechanism initiates the screen-changing action. During this process, one screen filter continues to operate while the other is moved to a non-working position for replacement. Once the new screen filter is installed, it can quickly switch to the working position, and the previously operating screen filter moves to the non-working position for cleaning or replacement.

Maintaining Production Continuity: Through material introduction and exhaust devices, air within the flow channels is thoroughly expelled to ensure uninterrupted material flow and minimal pressure fluctuations during screen changing, thereby maintaining production continuity and stability.

III. Application Characteristics

Efficient Filtration: The large surface area of the screen filters results in high filtration efficiency, effectively removing impurities and particles from the plastic melt, ensuring the product quality of cast films.

Stable Pressure: During screen changing, the continued operation of the backup screen filter minimizes fluctuations in material flow pressure, ensuring the stability of the extrusion process.

Continuous Production: The dual-column, dual-flow channel design allows both screen filters to operate simultaneously, enabling non-stop screen changing and ensuring continuous, uninterrupted production.

Strong Adaptability: Suitable for various plastic materials such as PP, PE, ABS, meeting the diverse needs of cast film production lines.

Extended Equipment Lifespan: Components of the screen changer, made from high-quality alloy steel and subjected to processes like nitriding, have a long service life, reducing equipment maintenance costs.

IV. Application Areas

The Cast Film Double-Column Hydraulic Screen Changer is widely used in cast film production lines and is also applicable to various polymer molding production lines, including blown film, flat film, pipes, sheets, wires, fibers, granulation, and recycling. It can be installed on any new or existing extruders, melt pumps, reactors, or other extrusion production lines, enhancing production efficiency and product quality.

In summary, the Cast Film Double-Column Hydraulic Screen Changer is an efficient, stable, and adaptable screen-changing equipment that is of great significance in improving the production efficiency and product quality of cast film production lines.

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