A two roll mixing mill is a valuable machine for any lab or production team working with ,it is a critical equipment widely used in processing and compounding EVA (ethylene-vinyl acetate) materials.
Basically , a two roll mixing mill consists of two horizontally placed cylinder rollers rotating in opposite direction, which generate a strong shear force to compress, blend and mix the EVA resin with additives, foaming agents, crosslinkers, and fillers.
This two roll mixing mill for rubber and EVA compound materil is a must-have machine in EVA foam sheet production lines, particularly in labs or pilot plants where precision and consistency are key.
Here ,let us explore how to mix EVA on a two roll mill in this blog as follows:
Key Functions of Two Roll Mill in EVA Production
1. Sheet Making
The raw EVA compound material is kneading in the kneader or intensive banbury mixer . The EVA compound material is hot, soft, and uneven ,it would be sent onto two roll mill ,which presses this EVA compound into thin, uniform sheets of consistent thickness as needed. This EVA material would be used for vulcanizing and foaming later in a press.
2. Additive Blending
during milling on the two roll open mixing mill equipment , color masterbatches, foaming agents (like ADC), and crosslinkers (like DCP) are often added on the EVA material. The Two roll mixing mill allow operators to monitor and check the mixture ,so that adjust the formula manually .
3. Temperature Control
Typically ,these lab mixing mill equipment can be electrical or oil heating for choice ,its temperature are usually maintain between 100–180°C, suitable for softening EVA without premature foaming.
4. Dispersive Mixing
Since the two roll mixing mills provide strong shear force ,thus it ensures even dispersion of fine powders like CaCO₃ or talc within the EVA matrix.
Why Use a Two Roll Mill for EVA in Labs?
As EVA material is a flexible and durable polymer which are widely used in shoes, foams, packaging and other applications. In laboratories and R&D departments, the two roll mill equipment are very critical in compounding, blending, and sheeting EVA materials, especially in the early stages of formulation development and quality testing.
In R&D environments, a lab-scale two roll mill equipment can bring benefits as follows :
* Small-batch processing
* Easy visual monitoring of dispersion
* Precise control over roll speed, temperature, and nip gap
* Compatibility with both rubber and thermoplastic EVA formulations
Wide Applications of EVA Processed by Two Roll Mill
* Foam Sheets (yoga mats, packaging foam)
* Shoe Soles (sports, slippers, sandals)
* Footwear
* Shock Absorption Pads
* Automotive Interior Foam
* Toy and Craft EVA Sheets
* Biomedical device
* Adhesives, sealants, coatings etc
In conclusion , a two roll mill machine is indispensable in the EVA foam production workflow. This equipment not only prepares the sheet for further vulcanization and foaming, but also it ensures the compound is mixed thoroughly and safely.
If you’re setting up an EVA lab line, then invest in one lab-scale two roll mixing mill and dispersion kneader will undoubtedly improve processing quality, control, and repeatability.