plastication systems (arranged in order of importance)
are used:
• Slow running single-screw extruders with screw lengths
of 20-25 d (screw diameter),
• Conventional design with smooth barrel and
compression screw,
• Barrel with a grooved intake zone (mechanical feed aid)
which is cooled, with little or no compression in the
screw channel.
• Reciprocating screws of conventional design
• High-speed single-screw extruders
• Twin-screw extruders
• Ram extruders
Before the processing operation of the different
plastication systems is examined in more detail,