Plastic Sheet Extruder Melt Pump Composition Mechanism and Working Principle

Sheet extrusion melt pump is a key equipment in plastic processing industry, mainly used in sheet extrusion line, its core function is to realize stable and efficient extrusion process by precisely controlling the flow and pressure of high temperature and high viscosity polymer melt.

I. Structural Composition

Sheet extrusion melt pump usually consists of the following core components:

Pump body: made of high temperature tool steel or alloy steel to ensure stability and corrosion resistance under high temperature and high pressure environment. Gear set: active gear and driven gear precision meshing, through the rotation of the melt delivery and pressurization.

Slide bearing: supports the gears and reduces friction to ensure stability and durability at high speed rotation.

Sealing system: adopts packing seal or mechanical seal to prevent melt leakage and ensure equipment safety.

Heating system: supports electric heating or thermal media heating to ensure that the melt maintains the proper temperature and fluidity in the pump.

II. Working Principle

The working principle of the melt pump is based on the volumetric conveying of gears:

Melt suction: when the gear rotates, the melt enters the confined space formed by the gear tooth groove and the pump body.

Melt conveying: the gears continue to rotate, pushing the melt from the suction area to the discharge area.

Melt pressurization: When the gears mesh, the volume of the gear grooves decreases and the melt is compressed and discharged, realizing the pressurization effect.

Stabilized output: By adjusting the gear speed, the melt flow and pressure can be precisely controlled to ensure the stability of the extrusion process.

III. Suggestions for selection

When selecting melt pump for sheet extrusion, the following factors need to be considered:

Melt viscosity: Select the appropriate pump type according to the viscosity range of the processed material.

Output requirements: Combine with the capacity of the extruder to select the appropriate flow range.

Pressure Requirements: Select the appropriate output pressure based on the pressure requirements of the extruder head.

Material compatibility: Ensure that the material of the pump body, gears and other components is compatible with the processed material to avoid corrosion or abrasion.

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