The open mill is a double roll machine that uses two rolls that move relative to each other at different speeds to produce shear force for plastic refining. During the operation, it is necessary to continuously perform operations such as triangular wrapping or curling on the rubber material.

The internal mixer utilizes the regular contraction of space generated by the relative motion of the designed blades to generate shear force, without the need for manual operation and saving labor.

The open mill has a simple structure and low cost, but it requires high labor intensity, causes significant pollution, and causes great physical harm to workers.

Internal mixers are relatively expensive, but they can be heated, and pressurized internal mixers can be used to process materials that are difficult to plasticize. Low labor intensity and strong adaptability.

The internal mixer is a high-strength intermittent mixing equipment developed on the basis of the open mill. Therefore, the emergence of the internal mixer is an important achievement in rubber machinery, and it is still a typical important equipment for plasticizing and mixing, which is constantly developing and improving.

Kneading machine is a device that produces strong shear action by a pair of blades (usually Z-shaped) that cooperate and rotate with each other, allowing semi dry or rubber like viscous plastic materials to react quickly and obtain uniform mixing and stirring. It is an ideal equipment for mixing, kneading, crushing, dispersing, and re polymerizing various high viscosity elastoplastic materials into various chemical products. It has the advantages of uniform stirring, no omissions, and high kneading efficiency. It is widely used in high viscosity sealants, silicone rubber, neutral acidic glass adhesives, chewing gum, bubble gum, pulp, cellulose, as well as in industries such as batteries, inks, pigments, dyes, pharmaceuticals, resins, plastics, rubber, cosmetics, etc.