In the rubber ,silicone ,chemical and plastic compounding industries, open mixing mills play a crucial role in preparing and blending raw materials. The core components of open mixing mill are the two horizontal cylinders rollers (or rolls), which are made from chilled cast iron or alloy steel material ,which offers excellent wear resistance and a high-hardness surface. And the hardness of rollers can reach up to HS65-70°,which thus can stand hard material and also free of scratch-proof . Some advanced models mixing mill, they may adopt alloy steel rolls with hard chrome plating for anti-rust and extended life,its hardness can reach up to HS75 and even better.
When open mixing mill start working ,these two rolls rotate toward each other at different speeds , one roll typically rotates faster than the other, which generate shearing forces to knead, refine and disperse materials . With the rotation of the two rolls, the raw materials and additional components are dragged into the roll gap between the rolls , The two roll open mixing mill is suitable for a wide range of material , such as rubber, PVC, chemical ,thermoplastics , plastic, silicone ,color masterbatch ,TPE compounds, or Polymer like LDPE, HDPE, PP, PVC, PS, ABS, HIPS etc.
What Can Roller of Open Mixing Mill Do ?
For the two roller open mixing mill, these two rollers play a key role in the mixing process, they are specially used to crush or grind various materials .
1. Mixing and Blending
The rollers are the core components of this lab open mixing mill equipment, it can be used to blend polymer base, fillers, stabilizers, and other additives by applying shear and pressure.
2. Plasticizing and Refining
As raw materials paare drawn between the two rotating rolls, which generate heats and soften the material for plasticizing and refining .
3. Shearing and Dispersion
With the rotation of the two roller, the distance between the two rollers is drawn, The differential speed between the two rotating rolls provides a strong shearing force, which shear and disperse materials , in order to reach the needs of mixing evenly and completely.
4. Controlling Thickness
By adjusting the gap between the rollers, operators can control the gap to control the thickness of the material as desired .
Types of Rollers
The surface of the roller is usually finished by a mirror-polished ,so that improves release and reduces material sticking.
* Smooth Rollers: Ideal for ensuring smooth and consistent sheets, this type of roller are suitable for rubber ,PVC and plastic compounding,
* Grooved Rollers: Sometimes used to improve grip or process tacky materials.
* Drilled or Hollow Rollers: Such drilled roller usually include internal cooling or heating systems to maintain optimal processing temperature.
Therefore,the rollers of an open mixing mill are not just simple cylinders rolls , but also they are precision-engineered components that determine the efficiency, consistency, and safety of your compounding process.
The two roll mill equipment is a must-have machine in the plastic ,chemical and rubber industries for formula development, color matching, small batch testing, pilot production, contrast, and quality control.
So understanding how they work helps you to select the right and most suitable mixing mill equipment.
Are you looking for high-performance open mixing mills with advanced roller design?
Contact Simptek today to explore our custom-built rubber and plastic mixing solutions.
