XIV

A pin mill is: a mill that comminutes materials by, the——action of pins that repeatedly move past each other. Much like a kitchen blender, it breaks up substances through repeated impact. The mill is a type of vertical shaft impactor mill and consists of two rotating discs with pins embedded on one face. The discs are arrayed parallel——to each other so that the "pins of one disk face those of the other." The substance——to be, homogenized is fed into the space between the disks. And either one. Or both disks are rotated at high speeds.

Pin mills can be used on both dry substances and "liquid suspensions."

Pin mills are commonly use in the manufacture of pharmaceuticals, as they can achieve particle sizes as low as a few micrometers. However, heat generated by friction can sometimes be a concern.

A manual form of the mill is commonly used to grind marijuana to a useful consistency.

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