Plastic film extrusion melt pump

Plastic Film Extrusion Melt Pump plays a crucial role in the production process of plastic film. Here is a detailed introduction to this equipment:

Definition and Purpose

The Plastic Film Extrusion Melt Pump, or simply the melt pump, is a device specifically designed for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts (such as plastic melts). In the plastic film production line, the melt pump is typically used in series with an extruder to ensure that the melt is delivered stably and continuously into the extruder die, thereby producing uniformly high-quality plastic film.

Working Principle

The melt pump is a positive displacement conveying device whose working principle primarily relies on the change in working volume caused by the meshing of the driving and driven gears to convey the melt. As the gears rotate in the specified direction, the melt enters the tooth spaces of the two gears in the feed area. With the rotation of the gears, the melt is carried into the conveying area. When the gears mesh again, the melt in the tooth spaces is squeezed out into the discharge area and pressed into the outlet pipeline. Due to the continuous rotation of the pump shaft, the gears continuously press the melt towards the outlet side, enabling the pump outlet to reach very high pressures.

Main Structure and Characteristics

Main Structure: The melt pump mainly consists of a pump casing, a driving gear, a driven gear, sliding bearings, front and rear end plates, and gland seals. These components collectively form the feed area, conveying area, and discharge area of the melt pump.

Characteristics:

Pressurization and Pressure Isolation: The melt pump has a pressurizing function. When the material at the outlet encounters resistance from the molding die, the gears exert a compressive effect on the melt to achieve pressurization. At the same time, the gears act as a rotating barrier, effectively isolating the pressure fluctuations and flow rate fluctuations in the feed area from affecting the discharge area.

Stable Extrusion: The melt pump can eliminate feeding errors in the feeding system and significantly reduce fluctuations transmitted from upstream processes, making the extrusion process more stable.

High Precision: Since the flow rate of the melt pump is strictly proportional to its rotational speed, high-precision metering and conveying can be achieved.

In summary, the Plastic Film Extrusion Melt Pump plays an irreplaceable role in the production process of plastic film. By selecting and using the melt pump appropriately, product quality, production efficiency, and energy utilization can be significantly improved, contributing to the sustainable development of enterprises.

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