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The three adjacent rolls of a three roll mill (called the feed roll, centre roll and apron roll) rotate at progressively higher speeds. Material, usually in the form of paste, is fed between the feed roll and the center roll. Due to the narrowing space between the rolls, most of the paste initially remains in the feed region.
Bridle rolls are used to increase or decrease the strip tension in a processing line or rolling mill. Sketch 7 shows two, three and four roll bridles indicating the variables. The bridle rolls normally come in a set of two, three, or four rolls of equal diameter, with each roll individually powered by an electric motor/generator. [18]
The two roll rubber mill is used in almost every rubber production facility today. Many other inventors created rubber mills with varying degrees of similarity to Chaffee's initial designs. [3] George Watkinson patented a three roll design in 1894 while Harold Denmire patented a four roll design in 1932. [4] [5]
In the 19th century roller mills were adapted to grist mills before replacing them. The mill used either steel or porcelain rollers. [1] Between the years 1865 and 1872, the Hungarian milling industry upgraded and expanded the use of stone mills combined with roller mills in a process known as Hungarian high milling.
All of these mills are usually used for primary rolling and the roll diameters range from 60 to 140 cm (24 to 55 in). [10] To minimize the roll diameter a four-high or cluster mill is used. A small roll diameter is advantageous because less roll is in contact with the material, which results in a lower force and power requirement.
Rolling mill, for rolling (metalworking) Strip mill, a type of rolling mill; Slitting mill, for slitting metal into nails; Stamp mill, a specialized machine for reducing ore to powder for further processing or for fracturing other materials; Three roll mill; Ultrasonic disintegrator a type of Mill (grinding) Vibratory mill a type of Mill (grinding)