Melt pump for blown film machine

Blown Film Extruder Melt Pump: A Vital Component in Plastic Film Production

Below is a detailed analysis of the blown film extruder melt pump, which plays a crucial role in the plastic film manufacturing process.

I. Definition and Function

The film blowing machine plastic extruder melt pump, also known as the high-temperature melt pump for blown film production, is a specialized equipment utilized exclusively in the production of plastic films. Its primary function is to pressurize and stabilize the high-temperature plastic melt received from the extruder, subsequently delivering it with a consistent flow rate to the extruder die. This ensures the continuity and stability of the film production process.

II. Key Features

High-Temperature Stability: The melt pump operates reliably under high-temperature conditions, maintaining a stable and uniform melt temperature. This is vital for enhancing the quality and consistency of the plastic film.

High Flow Output: With its high flow output capacity, the pump caters to large-scale production needs, thereby improving overall production efficiency.

Precise Pressure Control: Through precise pressure regulation, the melt pump ensures even melt delivery, effectively preventing quality issues during the production process.

Longevity Design: Employing premium materials and advanced design concepts, the melt pump boasts an extended service life and lower maintenance costs.

III. Applications

The blown film extruder melt pump finds extensive application in the production of various plastic films, including but not limited to:

Polyethylene (PE) Film: Enhances film transparency and strength.

Polypropylene (PP) Film: Improves film flatness and thickness control accuracy.

Polyvinyl Chloride (PVC) Film: Reinforces film toughness and durability.

Furthermore, it is suitable for the production of other types of plastic films, catering to the diverse needs of various industries.

IV. Technical Principle

The working principle of the blown film extruder melt pump is based on the positive displacement pumping mechanism. Two intermeshing gears (or other forms of rotors) rotate within the pump body, creating a varying working volume to transport the melt. As the gears rotate in a predetermined direction, the melt enters the inlet zone. As the gears continue to rotate, the melt is carried into the delivery zone and propelled along the length of the pump body. When the gears mesh again, the melt in the tooth spaces is expelled into the discharge zone and pressurized into the outlet pipeline.

V. Parameters and Selection

The parameters of the blown film extruder melt pump encompass various aspects, such as specifications, conveying capacity, pressure range, temperature range, and viscosity range. Selection of the appropriate melt pump necessitates a comprehensive consideration of the specific application scenarios and requirements. For instance, the appropriate model is chosen based on the production line's scale and capacity requirements, while the suitable temperature and viscosity ranges are determined according to the material properties and process requirements.

VI. Maintenance and Servicing

Regular maintenance and servicing are essential to ensure the long-term stable operation of the blown film extruder melt pump. This involves checking the normalcy of the pump's transmission system, the cleanliness and unobstructedness of the inlet and outlet pipelines, and the lubrication condition of bearings and gears. Additionally, maintaining a stable inlet pressure for the booster pump and monitoring the pump's flow and pressure fluctuations are crucial. Promptly addressing any faults or abnormalities is necessary to prevent disruptions to production efficiency and product quality.

In conclusion, the blown film extruder melt pump is an indispensable key component in the plastic film production process. Its efficient, stable, and precise performance characteristics, coupled with its wide range of applications, provide significant support for the development of the plastic film industry.

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