Application of dual plunger automatic screen changer in plastic processing

The application of dual-plunger automatic screen changers in plastic processing is extensive and crucial, primarily manifested in the following aspects:

I. Application Scenarios

Dual-plunger automatic screen changers are particularly suitable for plastic processing production that requires high continuity, such as pelletizing, PE, PP, PPR, PERT pipe, sheet, film, cast film, non-woven fabric, chemical fiber spinning, and other processes. Their design intention is to maintain the continuity and stability of the material flow during screen changes, thereby minimizing the impact on production efficiency and product quality.

II. Working Principle and Characteristics

Working Principle:

Dual-Column Dual-Flow Channel Design: The dual-plunger automatic screen changer employs a dual-column, dual-flow channel design with internal heating for rapid and uniform heating. During normal production, both filters operate simultaneously. When it's necessary to replace a filter, one filter continues to work while the other is being replaced, achieving uninterrupted screen changes.

Alternating Work Mode: Through automatic or manual control of the material feeding and exhaust devices, it ensures that the material flow remains uninterrupted during screen changes, with minimal pressure fluctuations, minimal impact on production, and excellent continuity.

Characteristics:

Rigid Sealing Structure: It adopts a rigid sealing structure that guarantees no material leakage under high pressure and high temperature conditions, effectively reducing screen change resistance and hydraulic system operating pressure.

Integral Structure: With no load-bearing gaps, it enhances the load-bearing capacity and allows the system to withstand higher pressures.

High-Quality Materials: The plungers are made of high-quality alloy steel treated with nitriding, and the integral engineering oil cylinder extends the product's service life.

Progressive Material Feeding and Exhaust Structure: The pressure fluctuations during screen changes are minimal, ensuring the continuity and stability of the product.

Multi-Station Design: Depending on the filtering stations, it can be classified into dual-station and quad-station designs. The quad-station design increases the filtration area, meeting the production requirements for higher quality and yield.

III. Configurations and Advantages

Standard Configurations: Typically include the screen changer body, an energy-storage hydraulic pump station, and heating devices.

Customized Configurations: Can be equipped with PLC control cabinets based on customer needs, achieving automated operation control and reducing manual intervention costs for operators.

Advantages:

High Efficiency and Stability: With uninterrupted screen changes, the material flow remains continuous and stable, minimally affecting production efficiency and product quality.

High Load-Bearing Capacity: The integral structure with no load-bearing gaps allows for high load-bearing pressure.

Long Service Life: High-quality materials and rational design extend the product's service life.

Wide Applicability: Suitable for various plastic processing technologies and raw materials, such as PP, PE, ABS, etc.

IV. Specific Application Examples

Dual-plunger automatic screen changers have been widely used in plastic pelletizing, sheet extrusion, film production, and other processes. For instance, in plastic pelletizing machines, the quad-station dual-column screen changer enables four screens to operate simultaneously. During screen changes, the material flow and product output remain uninterrupted, with a filling and exhaust system designed to fully eliminate gases trapped in the material and the porous plate to be replaced, ensuring product quality.

In conclusion, the application of dual-plunger automatic screen changers in plastic processing is of great significance. It not only enhances production efficiency and product quality but also reduces production costs and manual intervention, making it an indispensable piece of equipment in modern plastic processing production.

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