In order to prevent channels or damage, a preferred embodiment envisages arranging elastic piston rings {HEAD ~ having staggered orifices} between {TAIL ~ the press parts} and the can wall 
between
In order to prevent channels or damage , a preferred embodiment envisages arranging elastic piston rings { HEAD ~ having staggered orifices } between { TAIL ~ the press parts } and the can wall
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH