In rubber mixers and extrusion lines, hydraulic systems operate under continuous and highly variable conditions.
During mixing, feeding, gap adjustment, and sheet forming, the system frequently alternates between high-load clamping and low-speed precision control.

For operators, a common observation is:

At low speed, pressure becomes unstable
The sound of the power unit turns sharp and irregular

Over time, these changes indicate degradation in hydraulic performance.

Industry Context: Continuous Load and Wide Speed Range

Rubber and plastics processing equipment typically operates under the following conditions:

Working pressure in the medium-to-high range, often approaching 25–31.5 MPa

Wide speed variation, requiring both high flow at fast operation and stable pressure at very low speed

Continuous 24/7 operation, leading to elevated oil temperature and inevitable contamination

These factors place demanding requirements on the hydraulic pump, especially in maintaining stability across different operating modes.

Core Requirement: Stable Pressure at Low Speed with Continuous Duty Capability

In these applications, hydraulic systems must achieve:

Stable pressure output during low-speed adjustment
Sufficient flow at higher operating speeds
Reliable performance under continuous heavy-duty operation

This requires a pump design that balances efficiency, durability, and stability across a wide speed range.

Solution Platform: FG High-Pressure Internal Gear Pumps

To meet these requirements, many machine builders are adopting FG internal gear pumps as the main hydraulic power source.

Key Technical Parameters

Speed range: 200–3000 r/min
Rated pressure: 31.5 MPa
Maximum pressure: up to 35 MPa

This range supports both high-speed production and low-speed precision adjustment.

Displacement Selection for Typical Applications

FG1 (25–40 mL/r) is commonly used for small and medium mixers and extrusion lines

FG2 (64.7–100 mL/r) is selected for larger systems requiring higher flow under high pressure

Structural Advantages

Internal gear design provides low pulsation, improving pressure stability during low-speed operation

Lower noise characteristics make continuous operation more acceptable in workshop environments

Stable volumetric efficiency across a wide speed range supports consistent hydraulic response

Performance Improvements in Practical Operation

After implementing FG internal gear pumps, engineers typically observe:

Stable pressure readings during low-speed gap adjustment and extrusion

Reduced pressure fluctuation, minimizing the need for system compensation

Improved acoustic behavior, with pump noise shifting from sharp tones to a smoother, consistent background sound

These improvements enhance both process control and operator experience.

Engineering Value: Matching Pump Design to Real Operating Conditions

For rubber and plastics processing equipment, pump selection should go beyond meeting nominal pressure requirements.

FG internal gear pumps provide:

Stable performance across wide speed ranges
Reliable operation under continuous load
Reduced noise and pulsation
Improved consistency in process control

Summary

In rubber mixers and extrusion lines, hydraulic performance must remain stable under continuous and variable conditions.

FG internal gear pumps enable:

Stable low-speed operation for precise adjustments
Consistent high-pressure performance for clamping and forming
Lower noise levels for continuous operation
Improved system reliability and service life

Selecting a pump designed for wide speed range and continuous heavy-duty service ensures that torque, noise, and durability are all maintained within controlled limits.