What is a rubber kneader Mixer? What is its function?

An open mill, also called an open-type rubber mixing mill, has a core structure of two horizontally rotating rollers with an adjustable gap. Materials are processed while exposed to air on the roller surface.

Working Method: Requires manual operation. Materials are mixed using the shearing and frictional forces of the rollers. Manual cutting, turning, and triangular bales are also necessary. The mixing effect relies entirely on the worker's experience.

Core Advantages: Simple structure, low initial cost, easy maintenance, low failure rate, allows for direct observation of the rubber compound's condition, suitable for small-batch production, formula trials, or fine processing of high-viscosity, heat-sensitive materials.

Obvious shortcomings: Open operations generate dust and volatile substances, polluting the environment and affecting workers' health; production efficiency is low (single batch mixing takes more than 30 minutes), labor intensity is high, and there are also safety risks such as burns and mechanical entanglement.

The internal mixer, also known as a closed-loop rubber mixing mill, has a core structure consisting of a sealed mixing chamber and a pair of opposing rotating rotors, along with upper and lower top bolts. The mixing process is completely enclosed.

Working Method: Automated pressure mixing. Materials are mixed through the complex movements of the rotors, including extrusion, shearing, and stirring, requiring no manual intervention. Temperature, pressure, and time can be precisely controlled via a program.

Core Advantages: Extremely high production efficiency (single batch mixing time is only 5-15 minutes), excellent mixing uniformity, and high product consistency; the closed design reduces dust and exhaust gas leakage, making it environmentally friendly and safe, especially suitable for large-scale industrial production (such as tire and seal manufacturing).

Significant Disadvantages: Complex equipment structure, high initial purchase cost, difficult maintenance, and the need for regular replacement of components such as rotors and seals.