This procedure is called jacketing or canning. In addition to acting as a low-friction interface,…

This
procedure is called jacketing or canning. In addition to acting as a
low-friction interface, the jacket prevents contamination of the billet by the
environment. Also, if the billet material is toxic or radioactive, the jacket
prevents it from contaminating the environment. This technique also can be used
for extruding reactive metal powders (Chapter 17).

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