Plastic PP Granulation Melt Pump and Single-Plate Screen Changer

Plastic PP Granulation Melt Pump and Single-Plate Screen Changer Play Important Roles in the Plastic PP Granulation Process. Here are the detailed introductions to both:

I. Plastic PP Granulation Melt Pump

Definition and Purpose:

The Plastic PP Granulation Melt Pump is a specialized melt pump designed for polypropylene (PP) materials. It is mainly used in the extrusion molding process of PP materials, such as granulation, film production, pipe production, sheet production, plate production, and other industries.

Main Functions:

Improving Product Quality: By precisely controlling flow rate and pressure, the melt pump can significantly enhance product quality, making products more uniform and stable.

Achieving Near-Linear Flow Output: The flow rate of the melt pump is strictly proportional to its rotational speed, allowing for near-linear flow output that is easy to control.

Reducing Screw Pressure Requirements: Adding a melt pump to the extrusion system reduces the screw pressure requirements, lowering the extruder's load, thereby saving energy and reducing costs.

Increasing Extrusion Output: The stable conveying and pressure-boosting functions of the melt pump help improve extrusion efficiency and increase product output.

Working Principle:

The melt pump consists of two gears, typically driven by a single motor. When the gears rotate, they meter out precise amounts of material on the discharge side. The gear rotational speed is tightly controlled by an AC or DC drive with a design deviation of less than 1%.

Structural Characteristics:

The melt pump has a compact structure, reliable operation, low energy consumption, and high volumetric efficiency. It exerts minimal shear on the melt, providing stable flow at high viscosity and pressure without outlet pressure fluctuations.

II. Single-Plate Screen Changer

Definition and Purpose:

The Single-Plate Screen Changer, also known as a plate-type screen changer, is a screen-changing device used on plastic extruders. It is widely applied in the production processes of thermoplastic plastics such as sheet, plate, pipe, profile, blown film, cable, granulation, and rubber.

Main Characteristics:

Fast Screen Change: It features no material leakage, wear resistance, and rapid screen change, transitioning from the first to the second working position in just 0.5 to 1 second.

Uninterrupted Material Flow: With dual working positions, one screen filters while the other is standby outside the screen changer body, ensuring production continuity.

Simple Operation: It features automatic sealing compensation, no material leakage, high pressure resistance, large filtration area, and easy operation.

Working Principle:

The single-plate screen changer mainly consists of a main body, reciprocating slide plate, hydraulic cylinder, removable perforated plate, and centralized wiring protection device. The reciprocating motion of the slide plate is controlled by the hydraulic system to achieve rapid screen change. The two working positions alternate, filtering polymer media through screens to clean the media and produce high-quality products.

Maintenance and Care:

Regularly check the operating status of the hydraulic system to ensure proper functioning of all components. Periodically clean the perforated plate to prevent clogging. Regularly inspect the sealing performance to ensure no leakage.

In summary, the Plastic PP Granulation Melt Pump and Single-Plate Screen Changer each play crucial roles in the plastic PP granulation process. The melt pump is responsible for precisely controlling flow rate and pressure to improve product quality and extrusion efficiency, while the single-plate screen changer ensures rapid screen change, guaranteeing production continuity and product quality stability. Together, they provide efficient and stable support for the plastic PP granulation process.

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