What are the characteristics of melt gear pumps for EVA materials?

Melt pumps for EVA (Ethylene Vinyl Acetate) materials, as equipment specifically designed to handle polymer melts such as EVA, possess a series of unique characteristics. The following is a detailed summary of these characteristics:

I. Design Characteristics

Temperature Control Design

The shaft is designed with circulating temperature-controlled water to regulate and control the temperature of the pump body and the melt, preventing material aging or performance degradation due to overheating or temperature fluctuations of the melt.

A rotating joint is configured at the shaft end to ensure effective circulation of the temperature-controlled water.

Flow Channel Design

The flow channel design is devoid of dead ends, with smooth arcuate transitions in the internal circulating flow channels, preventing melt retention or dead ends within the pump, thereby reducing material waste and aging risks.

The optimized flow channel design facilitates smooth melt flow and enhances pumping efficiency.

Gear Design

A helical gear design is employed to improve gear meshing efficiency and pumping stability.

Precision processing and fitting of the gears ensure uniform melt delivery and precise metering within the pump.

Seal Design

A maintenance-free spiral seal design reduces leakage risks and enhances the pump's sealing performance and reliability.

The design of the sealing structure also considers ease of disassembly and maintenance, lowering maintenance costs.

II. Functional Characteristics

Pressure Boosting and Metering

The melt gear pump achieves pressure boosting and precise metering of the melt through gear meshing and rotation.

In extrusion machines or polymer processing processes, the melt gear pump can provide stable melt pressure and flow rate, ensuring product quality and production efficiency.

Stable Flow Rate

The melt gear pump exhibits low pressure-flow pulsation, achieving nearly linear flow rate output.

This is particularly important for processing processes requiring precise flow rate and pressure control, such as precision injection molding and film production.

Strong Adaptability

The melt gear pump has a wide operating temperature range and viscosity adaptability.

It can handle various polymer melts ranging from low to high temperatures up to 350°C, as well as from ultra-low viscosity aqueous media to ultra-high viscosity rubber melts.

Enhanced Production Efficiency

Installing a melt metering pump on a photovoltaic film extrusion production line can reduce pressure fluctuations at the die head and inhibit polymer temperature rise.

By allowing the melt metering pump to handle the pressure boosting function, the extruder is solely responsible for melting and mixing polymers, thereby improving the overall extrusion line efficiency and product quality.

III. Other Characteristics

Ease of Maintenance

The design of the melt gear pump considers ease of disassembly and maintenance, reducing maintenance costs. The precise structural design ensures high-precision operation of the pump while extending equipment lifespan.

Safety

EVA melt gear pumps typically adopt designs and materials that comply with safety standards, ensuring safety during operation.

The equipment operates with low noise and vibration, minimizing the impact on operators and the environment.

In summary, melt gear pumps for EVA materials exhibit characteristics in terms of temperature control design, flow channel design, gear design, and seal design, as well as functional characteristics such as pressure boosting and metering, stable flow rate, strong adaptability, and enhanced production efficiency. These characteristics make melt gear pumps have broad application prospects and significant value in EVA and other polymer processing processes.

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