Double roll open millIt is an open intermittent equipment that uses two relatively rotating hollow rollers to extrude, shear, and mix polymer materials (such as rubber and plastic). It is mainly used for processes such as material mixing, plasticizing, hot refining, and tablet pressing. The relative rotation of the two rollers is used to achieve material shearing, extrusion, and mixing, providing uniform semi-finished materials for subsequent molding (such as vulcanization and injection molding).

　　Double roll open millThe material processing is achieved through three steps of "cutting+squeezing+mixing", and the specific process is as follows:

1. Feeding stage: Block or granular materials (such as rubber raw rubber, plastic particles) are fed into the "roll gap" between two rollers. Due to the frictional force generated by the relative rotation of the two rollers, the materials are rolled into the roll gap.

2. Shear and plasticization stage: There is a speed difference between the two rollers (the speed of the movable roller is greater than that of the fixed roller), and the material is subjected to strong shear forces in the roller gap, causing the molecular chains to be stretched and broken. At the same time, the roller is heated to soften and plasticize the material (rubber gradually changes from elastic to plastic, and plastic gradually melts).

3. Mixing and film production stage: The plasticized material is repeatedly rolled on the surface of the double roller, and additives (such as carbon black, plasticizers, stabilizers) are evenly dispersed into the substrate, forming a uniformly thick sheet material (such as rubber film, plastic sheet), which is discharged from below the roller.

Advantage:

1. Simple construction, low cost: The equipment structure is intuitive, easy to maintain, and suitable for small-scale production.

2. Wide processing adaptability: It can handle a variety of polymer materials and additives to meet diverse needs.

3. Flexible operation: By adjusting the roller distance, speed, and temperature, customized production of different products can be achieved.