Mills-roll

3 Roll Mills, 5 Roll Mills, 2 Roll Mills

Roll Mills are used to grind, disperse, and refine viscous liquids. We are suppliers of roll compactors including used three rolls mills (used for lipstick and in the cosmetic industry), two roll mills, and five roll mills (used for chocolate and cocoa). Our used rolling mills consist of both lab mills and floor size production units. Triple/three roll mills are available for many uses including as ink mills, paint mills, pigment dispersion mills, soap refiners as well as chemical and pharmaceutical refiners. Our inventory of roll mills includes used ROSS roll mills, LEHMANN roll mills, BUHLER roll mills, and DAY roll mills.

FAQ :

What is a roll mill and what is it used for?

A roll mill is a machine that uses two or more rotating cylindrical rolls to grind, disperse, mix, or refine materials. The rolls turn at different speeds, creating shear forces that break down particles, homogenize mixtures, and reduce viscous materials to a finer, more uniform consistency. Depending on the configuration, roll mills can handle everything from thick pastes to stiff rubber compounds. The process is valued in industries where particle size reduction and thorough dispersion are critical to product quality.

Common applications include ink milling, paint pigment dispersion, cosmetic formulations like lipstick, pharmaceutical refinement, adhesive processing, soap refining, chocolate and cocoa processing, and rubber or plastics compounding. Three-roll mills are particularly well-suited for high-viscosity materials that require very fine dispersion, while two-roll mills are the standard choice for rubber and thermoplastic mixing. Five-roll mills are used in specialized food processing applications such as chocolate refining, where multiple passes through successive roll gaps progressively reduce particle size to achieve the smooth texture required in finished confections.

What are the main differences between a 2-roll mill, a 3-roll mill, and a 5-roll mill?

The number of rolls directly determines how a mill processes material and what applications it suits best. A two-roll mill uses a single nip point between two rolls rotating toward each other. The material is worked repeatedly as the operator folds and refeeds the band of material across the rolls. This design is standard in rubber compounding, plastics mixing, and color masterbatch production because it allows the operator to add ingredients incrementally and observe the blend in real time. Two-roll mills are relatively simple machines and are common in both lab and production settings.

A three-roll mill uses three rolls arranged horizontally, each rotating in alternating directions. Material is fed between the first and second roll, then transferred to the second and third roll, with each nip applying progressively finer shear. This makes three-roll mills highly effective for dispersing pigments into inks, paints, cosmetics, adhesives, and pharmaceutical pastes. Five-roll mills extend this principle further, passing material through four successive nip points in a single pass. They are most commonly associated with chocolate and cocoa refining, where achieving a very fine particle size is essential. Choosing between configurations depends on the material viscosity, required particle size, and the level of operator control needed during processing.

What industries commonly use roll mills?

Roll mills serve a wide range of industries, and the type of mill used tends to align closely with the specific processing requirements of each sector. Three-roll mills are heavily used in the cosmetics industry for products like lipstick and cream formulations, in the pharmaceutical industry for ointments and topical preparations, and in the printing industry for dispersing pigments into inks. Chemical manufacturers rely on them for adhesives, sealants, and specialty coatings where precise particle dispersion directly affects product performance. Soap and personal care manufacturers also use three-roll mills as refiners to achieve the smooth, consistent texture required in finished products.

Two-roll mills are the dominant machine type in rubber and plastics compounding, where they are used to incorporate fillers, accelerators, plasticizers, and colorants into polymer bases. The food industry uses five-roll mills extensively for chocolate and cocoa processing, where reducing particle size below 20 microns is the standard for premium confections. Laboratory-scale roll mills serve research and development functions across virtually all of these industries, allowing formulators to test small batches before scaling up to full production equipment. Used roll mills are available across all of these categories, from small tabletop lab units to large floor-standing production machines.

What should I inspect before buying a used roll mill?

The condition of the rolls themselves is the most important factor to evaluate. Look closely at the roll surfaces for scoring, pitting, corrosion, or uneven wear. Even minor surface damage can compromise dispersion quality and may require expensive regrinding or roll replacement before the machine is production-ready. Roll gap parallelism is another critical measurement. Over time, bearing wear and frame stress can cause the rolls to fall out of parallel alignment, which results in uneven processing across the width of the machine. Restoring precise parallelism can be a significant repair cost, so this should be confirmed before purchase if possible.

Beyond the rolls, buyers should examine the bearings, gearbox, and drive motor condition. Listen for unusual noise during operation and check for signs of oil leaks or overheating around the gearbox. The roll adjustment mechanism, whether manual, hydraulic, or automatic, should move smoothly without binding or backlash. For hydraulically controlled mills like the Buhler SDH-200, the hydraulic system should be inspected for leaks and proper pressure response. Reputable used equipment dealers will typically accommodate in-person or video inspections so buyers can assess the machine's current condition accurately. Machines that were recently decommissioned from active production often reflect real operating wear, which is useful information when evaluating remaining service life.

What is the typical price range for used roll mills?

Pricing for used roll mills varies considerably based on roll diameter and length, the number of rolls, brand, age, and overall mechanical condition. Small tabletop lab three-roll mills, such as 2.5-inch by 5-inch units from manufacturers like Ross or Torrey Hills, typically sell for a fraction of what a full production unit costs. These are popular with R&D departments and small-batch producers who need a capable machine without the footprint or cost of a floor-standing model. Mid-size production three-roll mills in the 4x8 to 6x14 inch range from established brands like Ross, Kent, or Lehmann occupy a broad middle tier of the market.

Larger production units, such as 13x32 inch three-roll mills or five-roll chocolate refiners from manufacturers like Buhler or Lehmann, command significantly higher prices and can represent substantial capital savings compared to sourcing equivalent capacity through other means. Machines with documented maintenance histories, recently reground rolls, or verified low operating hours typically sell at a premium, but they carry meaningfully lower risk for the buyer. Condition is often a more important price driver than age alone, since a well-maintained older machine from a strong brand can outperform a neglected unit of more recent manufacture. Buyers should factor in any required reconditioning, shipping, and rigging costs to arrive at a true landed cost before comparing options.

How do I determine the right roll mill size for my production needs?

Roll size is measured by diameter and length, and both dimensions affect throughput and the types of materials the mill can handle efficiently. Longer rolls process more material per pass, which increases output but also requires more consistent feed and more powerful drives to maintain roll speed under load. For laboratory work or small-batch development, a tabletop unit with rolls in the 2 to 4 inch diameter range is generally sufficient. These smaller machines are also easier to clean between batches, which matters in industries like pharmaceuticals or cosmetics where cross-contamination is a concern.

For production-scale operations, the right size depends on batch volume targets, material viscosity, and the cycle time required to meet daily output. A useful starting point is to identify what size equipment is standard in your industry for your specific application, then look for used units in that range. It is also worth considering whether a lab-scale mill is needed alongside a production unit, since many facilities run a smaller machine for formula development and quality checks while the larger unit handles full runs. Consulting with a dealer who specializes in your industry's processing equipment can help narrow down which roll dimensions and configurations are appropriate, particularly since used inventory availability at any given time will influence what options are realistic.

Are replacement parts and service support still available for older used roll mill models?

Parts availability varies significantly by brand and model age, and it is one of the most practical factors to research before committing to a used roll mill purchase. Brands like Ross, Buhler, and Lehmann have strong reputations for long-term parts support, and their machines appear frequently in the used market partly because of that reliability. For older models, it is worth contacting the manufacturer directly before purchase to ask specifically about roll availability, bearing specifications, and gearbox components. Manufacturers can often indicate whether a machine is still within their supported service range or whether parts have been discontinued.

For machines where manufacturer support has been reduced due to age, third-party machining shops can often fabricate wear parts like rolls, scrapers, and aprons, though this adds cost and lead time. Bearings and drive components for most roll mills are standard industrial parts available through bearing and power transmission suppliers regardless of the machine's age. The practical risk is with proprietary components specific to a particular model, such as custom hydraulic assemblies or specialized control systems, where replacement options may be limited. Buyers should ask the selling dealer what they know about the machine's service history and whether any components have already been replaced or refurbished, as this information directly affects the realistic cost of keeping the machine running.

What is the difference between a lab roll mill and a production roll mill?

Lab roll mills are compact machines designed for small-batch processing, formula development, and quality control testing. They typically have roll diameters and lengths in the 2 to 5 inch range and are often designed to sit on a benchtop rather than requiring a dedicated floor footprint. Despite their smaller size, lab roll mills use the same fundamental operating principles as production units, which makes them useful for developing and validating formulas before scaling up. Many manufacturers produce lab versions of their production models, so the processing characteristics are comparable even if the output volume is much smaller.

Production roll mills are floor-standing machines built for continuous or high-volume batch processing. Roll dimensions typically start around 4 inches in diameter and can extend to 13 inches or larger in diameter and 32 inches or more in length for heavy industrial applications. These machines require dedicated electrical service, proper anchoring, and in many cases, cooling water connections to manage heat generated during processing. The used market includes both categories, and some facilities purchase both a lab unit and a production unit to cover development and manufacturing needs. When evaluating used options, it is important to match the machine's rated capacity and roll dimensions to the actual production volumes required, since running a production mill at a fraction of its capacity or pushing a lab mill beyond its design limits both lead to suboptimal results.

How does the inspection process work when buying a used roll mill?

Used equipment dealers generally offer inspection through three main formats: in-person visits, live video calls, and recorded video documentation of the machine. In-person inspections are the most thorough option when they are practical. Some machines are still installed at the facility where they were last used, which allows a buyer or their technician to observe the equipment in its operating environment, check for leaks, listen to the drive and gearbox under power, and measure roll gap consistency directly. When a machine is at a plant that is still running production, the dealer typically coordinates access between the buyer and the facility owner.

For buyers who cannot travel, video inspections have become a reliable alternative. A thorough video inspection should cover roll surface condition from multiple angles, the adjustment mechanism in operation, any visible wear on the frame or bearings, and the control panel or drive system. Buyers should ask specific questions in advance so the dealer can address each point during the video. It is worth noting that most used equipment dealers do not have production permits that would allow them to run test batches of actual product through the machine. What they can demonstrate is mechanical operation, roll movement, and drive function. For applications where processing performance is critical, buyers may want to factor in the cost of a post-purchase test run at their own facility when setting their budget and reconditioning expectations.

What are the most important brands to look for when shopping for used roll mills?

Several manufacturers have established strong reputations in the roll mill market, and their machines are consistently sought after in the used equipment space. Ross (Charles Ross and Son) is one of the most recognized names for three-roll mills, with a broad range of models from small lab units to large production machines used across cosmetics, pharmaceuticals, and specialty chemicals. Buhler is a leading name in food processing roll mills, particularly for chocolate and cocoa refining, and their hydraulic three-roll mills like the SDH-200 are well regarded for precision and durability. Lehmann is another respected manufacturer, known for large-format three-roll mills with features like Sight-O-Matic roll gap control that are valued in industrial production settings.

Kent, Day, and Torrey Hills Technologies are additional brands that appear regularly in the used market and have followings in specific application areas. When evaluating a used machine, brand reputation matters primarily because it correlates with parts availability, manufacturer support, and the quality of construction that affects long-term serviceability. A used mill from a well-supported manufacturer is generally a lower-risk purchase than an equivalent machine from a brand that has exited the market or reduced its service infrastructure. Buyers should cross-reference the specific model with the manufacturer to understand what level of support they can realistically expect, since support can vary even within a single brand's product line depending on the age of the machine.