Three-roller mill

The three-roller mill ( also: three-roller mill ) is the system used in printing ink production to deaerate the printing ink dispersed in agitator ball mills . The apparatus consists of three large cylinders that run against each other at different speeds. The cylinder spacing can be adjusted very finely depending on the model.

A manufacturer of pure linseed oil paints shows at a trade fair how linseed oil paints are rubbed in.

The dispersed ink is distributed between the first and second roller (cylinder).

In the very narrow, individually adjustable friction gap, high friction forces arise, which are rubbed even more intensely from cylinder 2 to 3 due to their different rotation speeds in order to eliminate any air inclusions and ensure a homogeneous printing ink.

In the pharmaceutical formulation sector, the three-roller mill is used as an 'ointment mill' to deagglomerate and homogenize the starting material, and in some formulations it is also used to crush the suspended solids. Here, too, the ointment is applied between the first two rollers and finally reaches a scraper via the 2nd and 3rd rollers.

The first roller rotates the fastest.