Roll Mill


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roll mill

[′rōl ‚mil]
(mechanical engineering)
A series of rolls operating at different speeds for grinding and crushing.

Roll Mill

 

a machine for milling grain (wheat, rye, and other crops) into flour; it is also used for crushing salt and other kinds of bulk raw materials. The operating members of a roll mill are one or two pairs of rolls that rotate toward each other at different peripheral speeds. The separation between the rollers (gap) is varied from 0.05 to 1.3 mm according to the size of the particles of the product being processed and the degree of fragmentation required. The mill’s feed mechanism continuously and uniformly delivers the product directly into the gap by means of a belt as wide as the whole length of the rolls. Rolling mills are manufactured with an automatic engagement and release for the lower moving roll.

Roll mill

A series of rolls operating at different speeds and used to grind paint or to mill flour. In paint grinding, a paste is fed between two low-speed rolls running toward each other at different speeds. Because the next roll in the mill is turning faster, it develops shear in the paste and draws the paste through the mill. The film is scraped from the last high-speed roll. For grinding flour, rolls are operated in pairs, rolls in each pair running toward each other at different speeds. Grooved rolls crush the grain; smooth rolls mill the flour to the desired fineness. See Grinding mill

References in periodicals archive ?
The Roll Mill Matic system consists of two wide belt conveyors that bring the rubber sheet from the mill discharging section to the top of the line to re-mix it and to cool it down.
The consideration of a nip value of 0.1 dm independent of the open roll mill dimensions is questionable.
This method of controlling the speed means that, for example, on a roll mill application when an emergency stop situation occurs, it is not necessary to shut down the electric motor.
The two roll mills used in the manufacture of silicone compounds prior to the advent of the Twin Roll Mill were an adaptation of older traditional designs of rubber mills (figure 1).
The DVR can be vulcanized with the conventional curatives and processed in standard mixers and on a two roll mill. The DVR had sufficient plasticity that it did not shred or crumble on the mill and thus other ingredients could be realy mixed in on the mill.
Among the primary characteristics of Netzsch three roll mills is also an electronic control panel that maintains temperatures, pressures and integrating feeding processes.
Drives for twin extruder/roller die machines and roll mills are highlighted in the literature.
Laboratory equipment highlighted includes two roll mills for rubber, electrically heated two roll mills for plastic, intensive mixers, hydraulic presses (compression and transfer), two-, three- and four-roll calenders, extruders and bale cutters.
Typically, this processing aid additive is internal or roll milled into the recipe at 0.5 to 2.5 phr.
Laboratory equipment offered includes two roll mills, intensive mixers, hydraulic presses, calenders, extruders and bale cutters.
No matter whether they are seeking a reliable drive system for their calenders, open roll mills, extruders or internal mixers, more and more companies are turning to MRC drives to improve quality, productivity and profits.