In rubber production lines, key equipment such as internal mixers, extruders and open mills operate under demanding conditions.
Low speed, high torque and sustained high pressure define their daily operation.

During mixing, rotors must run at very low speed while maintaining stable torque.
At the extruder head, pressure must remain steady despite formulation and temperature variation.
Any instability quickly translates into product defects such as thickness variation, bubbles or dimensional drift.

Industry Background

Many existing hydraulic systems on rubber lines still rely on conventional external gear pumps or older vane pumps.
Under real operating conditions, several issues become increasingly visible:

Volumetric efficiency drops at low speed, causing pressure to sag and forcing operators to increase setpoints

Flow and pressure ripple lead to speed fluctuation, affecting product consistency

High noise levels make it difficult to meet environmental and workplace standards

These problems directly impact both product quality and working conditions.

Core Requirement

Rubber processing equipment requires:

Stable pressure output under low-speed, high-torque operation

Consistent flow for uniform extrusion and mixing

Reliable performance under long-term high-pressure duty

Tolerance to elevated oil temperature and contamination

Solution Approach: FG Series High-Pressure Internal Gear Pumps

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

Key Technical Parameters

Rated pressure up to 31.5 MPa
Maximum pressure up to 35 MPa

Speed range from 200 to 3000 r/min

Displacement coverage:

FG0: 3.8–24 mL/r

FG1: 25.3–63.7 mL/r

FG2: 64.7–162.8 mL/r

This range supports both compact machines and large centralized hydraulic stations.

Structural Advantages

Internal gear design provides low flow and pressure pulsation, improving process stability

Stable volumetric efficiency at low speed supports torque consistency during mixing and extrusion

Lower noise characteristics improve working conditions in mixer rooms and extrusion areas

Robust structure offers better tolerance to oil contamination in dusty environments

Practical Selection and Configuration

In typical applications, engineers adopt the following approach:

FG1 (30–50 mL/r) is commonly used as the main pump for mixers and extruders

FG2 (80–125 mL/r) is selected for large centralized hydraulic stations on major lines

FG21 dual pumps are used when both main circuits and auxiliary functions need to be supplied

The front pump supports the main process, while the rear pump handles auxiliary motions

Performance Improvements in Operation

Projects using FG pumps in rubber processing lines consistently report:

Smoother extrusion speed curves with reduced fluctuation

More stable pressure during mixing and extrusion

Reduced variation in product thickness and weight

Lower system noise and improved operator comfort

Slower oil temperature rise, contributing to longer system life

Engineering Value

FG internal gear pumps provide a balanced solution for rubber processing by combining:

Stable low-speed performance

High-pressure capability

Reduced pulsation

Improved environmental adaptability

Summary

In rubber production lines, hydraulic performance directly influences product quality.

FG internal gear pumps enable:

Stable pressure and flow under low-speed, high-torque conditions

Improved product consistency in extrusion and mixing

Lower noise and better working environment

Reliable long-term operation in demanding conditions

This makes them a practical choice for both new rubber processing lines and upgrades of existing systems.