Rubber Powder

• Cryogenic turbomill? [1]

1. Primary shredder
2. Secondary shredder
3. Granulator - down to 0.4 mm - [2]. High speed knives.
4. Micronizer - 3 roll grinding mill? [3]. Cryo assist?

Links

1. Cryogenic Pump (as in pumping a cryogenic liquid, or as in a heat pump that reaches cryogenic temperatures such as a cryocooler?) needs some work, but there is this:

Open Source Cryogenic Construction Set