PMMA extrusion melt pumps for a wide range of applications

PMMA extrusion melt pumps are used in a wide range of applications. Their core function is to provide stable pressurization and flow control for high-viscosity polymers, such as PMMA (polymethyl methacrylate), to ensure the stability of the extrusion process and product quality. The following is the specific application scope and analysis:

1. Applicable materials and processes

PMMA profile extrusion melt pumps are designed for medium to high viscosity polymers and are particularly suitable for the following materials:

Transparent materials: PMMA, PC (polycarbonate), PS (polystyrene), etc., optical grade materials that require high precision extrusion.

Heat-sensitive materials: PMMA, PVC (polyvinyl chloride), etc., sensitive to temperature fluctuations, requiring strict control of the melt temperature to prevent degradation.

Engineering plastics: PA (nylon), ABS (acrylonitrile-butadiene-styrene copolymer), etc., high-viscosity materials that require high-pressure conveying

Typical process:

Extrusion of PMMA profiles: such as automobile lampshades, optical lenses, architectural decorative strips, etc., which require very high dimensional accuracy and surface finish.

Co-extrusion process: Co-extrusion with PS, PC and other materials to produce multi-layer composite profiles, requiring independent control of melt flow and pressure in each layer.

Microfoam or high barrier coating: linked with online thickness gauge and closed-loop control system to realize real-time feedback and adjustment of thickness.

2. Core application scenarios

(1) Stabilizing melt pressure and flow

Pressure fluctuation suppression: through the volumetric conveying principle of gear meshing, it can buffer the pressure pulsation caused by fluctuation of extruder screw speed and temperature change to ensure that the melt enters into the die head with constant pressure.

Precise control of flow rate: The output flow rate is linearly related to the rotational speed, so the melt flow rate can be precisely controlled by adjusting the pump speed, which can meet the requirement of profile thickness uniformity (thickness tolerance can be controlled within ±1%) and significantly reduce the scrap rate.

Case: In the production of PMMA automobile lampshade, the melt pump will reduce the thickness deviation from ± 0.2mm to ± 0.05mm, reducing the scrap rate by 30%.

(2) Melt homogenization and thermal stability

Elimination of dead zone residue: The shearing and mixing action of the internal gear can eliminate the “dead zone” residue in the melt, promote additive dispersion, reduce gel, crystal spots and other defects, and improve the surface finish and transparency of the profile.

Precise temperature control: By optimizing the runner design and heating system, the temperature fluctuation range of the melt is ≤±1℃, avoiding problems such as inconsistent shrinkage rate of the profiles and degradation of mechanical properties due to uneven temperature.

Case: In the production of medical grade PVC profiles, the melt pump ensures uniform distribution of plasticizers to avoid local brittleness or precipitation problems.

(3) Pressure Reduction and Stabilization and Equipment Protection

Reducing extruder load: Melt pump assumes the task of building pressure at the end, so that the extruder screw operates under lower pressure, reducing the wear and tear of the screw and barrel and prolonging the service life of the equipment.

Optimization of energy consumption: High-efficiency conveying capacity reduces the extruder motor load, reduces the overall energy consumption by 15%~30%, and at the same time reduces the risk of melt degradation due to high temperature and high pressure.

Case: In the PMMA profile production line, the installation of melt pumps extends screw life by 40% and reduces energy consumption by 22%.

(4) High-viscosity material handling

High-pressure conveying capability: It can provide up to 40MPa output pressure, easily conveying high-viscosity melts (e.g., engineering plastics such as PEEK, LCP, etc.), breaking through the viscosity limitation of traditional extruders.

Linear flow channel design: Reduce the residence time of materials in the pump to avoid performance degradation caused by too long thermal history, especially suitable for PMMA and other heat-sensitive materials.

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