Roller Presses for Briquetting, Compaction and Grinding
Köppern roller presses are centered around two counter-rotating rollers, supported in the frame by spherical, self-aligning roller bearings. In addition to radial loads, the bearings are able to accommodate axial loads acting in both directions, making them insensitive to shaft-skewing during operation. 

The fixed roller is supported directly on the press frame, while the so-called floating roller is supported in the frame by a hydro-pneumatic spring. The movement of the floating roller constitutes the basic principle of a roller press. The extent of the roller movement (roller gap) is a function of the pressing force generated by the hydraulic system in relation to the reaction forces exerted by the material being processed and the preset "zero-position" of the roller gap. The gap itself is controlled by means of the hydraulic supply unit depending on the requirements of the specific process. This design feature guarantees that all the feed material passes through the roller gap under the same process conditions, thus ensuring that the output quality of the product remains constant.

A roller press consists of the following main component assemblies:

• Hinged press frame for easy replacement of roller assemblies
  (read more about the different hinged press frame designs)
• Floating and fixed rollers
• Main drive with reduction gear
• Material feeder equipment
• Hydraulic pressurizing system
• Hydraulic supply unit
• Automatic grease lubrication
• Housing around the rollers to minimize the spreading of dust

The press frame accommodates the floating and fixed rollers as well as the hydraulic pressurizing cylinders and housing. Different roller surfaces are used (solid form, tires or segments) to meet the specific requirements of the feed to be processed. The materials used are tailored to customers’ needs and the requirements of the processed material. They are sufficiently wear-resistant to ensure maximum service life and minimum expense, whereby conventional pressing tools can be refurbished and re-used.
Read more about wear protection

Depending on flow and mould-filling characteristics, feed is introduced into the plant either via a screw feeder or a gravity-type feeder.

Roller press categories are based on the relevant bearing size. The smallest type delivers a pressing force of 400 kN, while larger presses can generate a pressing force of up to 20,500 kN. Equipment weights vary between 2 and 400 tons.
 
Factors determining the selection of machine type are:

• Required application
• Attainable peripheral speed
• Specific pressing force requirements
• Product shape and size
• Design of pressing tools and material feeders

Read more about different hinged frame designs

High-Pressure Grinding Roller Presses (HPGRs) for Comminution
Read more about HPGRs for the cement industry
Read more about HPGRs for the ores industry