A three roll mill grinds thick paste by squeezing it between three rolls that turn at different speeds. It is used for pastes that are too thick for a bead mill, such as pigment pastes and inks. Here you will find how it works, where it fits against a bead mill and what to specify.
A triple roll mill or paste grinding machine is the same machine.
We help you choose the machine that fits your product, batch size and plant, with specification, commissioning guidance and operator training. For three roll mill, the machine selection advice comes from IPCS (Indian Paints Consulting Service), based on your product, viscosity and batch size.
Three Roll Mill overview
Paste is fed between the feed roll and the centre roll, carried to the apron roll and scraped off by a blade. Each pair of rolls turns at a different speed, so the paste is sheared in the gap. The gap is set by hand or by a hydraulic system, and the rolls can be cooled to remove the heat that shearing creates.
The three roll mill is used for batch grinding of high viscosity material, where fineness is set by the gap and the number of passes.
Paint production applications for Three Roll Mill
It is used where the paste is thick and the fineness must be even.
Three roll mill vs bead mill: a bead mill is continuous and suits fluid pastes. A three roll mill suits thick pastes and small batches.
Technical specifications to review for Three Roll Mill
Ask for these in the quotation.
| Parameter | What to specify | Guide |
|---|---|---|
| Roll size | Diameter and length | Sets throughput |
| Roll material | Hardened steel, ceramic or other | Three roll mill roller material is matched to the product and wear |
| Gap control | Manual or hydraulic | Hydraulic gives repeatable gap |
| Cooling | Open or closed cooling of the rolls | Removes shear heat |
| Scraper | Blade material | Removes the paste from the apron roll |
| Safety | Guards and emergency stop | Rolls are a nip hazard |
Capacity and configuration choices for Three Roll Mill
Throughput depends on the roll size, the gap, the product and the number of passes. Share your product and target fineness, and we recommend a roll size.
Installation & support for Three Roll Mill
Routine care
- Check the roll surface for wear and scoring
- Inspect the scraper blade and replace it when worn
- Clean the rolls and the apron before the paste dries
- Check the cooling water flow
- Test the guards and emergency stop on a schedule
What we confirm before we quote
We confirm paste type and viscosity, required fineness, batch size and metal contamination limits before we quote. Foundation, utility and commissioning guidance follows the confirmed size, and operators are trained on your own product.
Frequently Asked Questions
What is a three roll mill used for?
It grinds thick pastes, such as pigment pastes and inks, between three rolls that turn at different speeds.
Three roll mill vs bead mill: which is better?
A bead mill is continuous and suits fluid pastes. A three roll mill is better for thick pastes and small batches.
What roller material should I choose?
Three roll mill roller material depends on the product and wear. Hardened steel and ceramic are common choices.
Is a triple roll mill different?
No. Triple roll mill and three roll mill are the same machine.
Can a three roll mill make paint?
A three roll mill for paint is used for pastes and special products, and a disperser or bead mill is used for normal decorative paint.
Discuss Three Roll Mill requirements with the machine team
Send us your product list, batch size and country for a three roll mill quotation. Please include: paste type and viscosity, required fineness, batch size and metal contamination limits.