The mixing process of two rolls mill equipment for silicone material is a mechanical method,specially used to mix silicone ,rubber or plastic materials with additives, such as dying agents or fillers, so that create a uniform compound material .
On this mixing process , these two horizontally placed stell cylinder rolls rotating towards each other at different speeds, which is also called as friction ratio . It generates heat and shearing forces in the nip (gap) between the two rolls, therefore stretch and break the internal macromolecular chains of the materials.
Here ,let us talk about how the two roll mixing mill procedure on silicone materia.
1. Preparing for Mixing
Firstly ,you need to clean the two rolls thoroughly in case of any impurity pollution. The you need to pre-heat the counter-rotating rolls slightly either by electric heating or steam heating ways to improve plasticity.
Then cut silicone rubber into small pieces by way of silicone bale cutter machine for feeding on the two roll mill equipment.
2. Selecting the Right Raw Materials
Feeding the Material
The second step is feed the silicone rubber material between the gap of two steel rotating rolls , which pull the material into the gap , keading and blending the raw material .
On this process , in order the material mixed evenly and fully ,you can use a spatula or knife to help guide and fold the raw material as needed.
3. Friction and Shearing
As these two steel rolls rotate toward to each other at different speed ,which creates shear force. Also the friction between the two rolls generates heat, which softens the silicone materials and makes them more pliable. Through the shearing action , it softens and mixes the silicone uniformly.
Of course ,if you want to put color on the material ,on this process ,you can add color masterbatch, fillers, or curing agents during this stage.
4. Homogenization
As the rolls rotating repeatedly towards to each other ,it would continue to blend ,cut and fold the banded material throughly until the silicone material milled uniformly in color and consistency.
This mill process usually take about 5–15 minutes, that depends on specific material and additives.
5. Final Output
Generally ,on the process , you can adjust the roll gap slightly to adjust the desired thickness of material . The mixing process would form a flat sheet finally .and you can collect the silicone sheet using a roller or by hand (with proper safety).
This sheet can then be further processed or used directly in manufacturing applications.
6. End of Mixing
Finally ,at the last stage ,you need to scrape off remaining material from the rolls to keep it clean .
7. Wide Applications of Two-Roll Mill Mixing:
The two-roll mill is widely used in the silicone ,rubber and plastic industries for compounding and mastication.
It is espercially useful for preparing materials for further processing, such as extrusion, molding, or calendering.
The mixing process is also used in laboratory mills for small-scale mixing and testing of new formulations.
If you are just in the industries of silicone ,rubber or plastic ,and want to find a quality laboratory mixing mill to procedure your mateiral ,welcome to talk with our expert with your ideal .