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 ?
Ben and Crouch say flat roll mills are willing to pay a premium for their material in light of its known chemistry.
1 dm was considered as the reference for an open roll mill with [PHI]660 x 2,100 mm ([PHI]26" x 84").
In simplified form, the total volume (load capacity) for an open roll mill can be calculated as follows:
Using this formula, the open roll mill loads were calculated for the same range of commercial machine sizes presented in table 1, and are summarized in table 2.
Table 1--proportional nips, band and total volume Open roll mill Roll Roll Nip, [V.
Another method referred by Grossman (ref 2) establishes that, for open roll mills with roll diameter less than 20 inches, the batch weight, expressed in pounds (0.
All the functions in this control system are also very usable for open roll mills, except for the rotor-offset control.
This feature can also be utilized in open roll mills when there is a problem with bringing the material down between the rollers because the friction between the compound and the rollers is too low.
The hydraulic drive solution from Hagglunds has also been utilized for roll mills for 30 years.
The benefits from this in open roll mills are obvious--the rolls will stop within some 25 mm compared to some 300 mm with a conventional drive.
Two roll mills offer users the opportunity to meet the criteria long applied to such machines.
Two roll mills are used and have the potential to be used in a wide variety of industries, and were traditionally used in the manufacture of rubber compounds.