Patent 2883677
Without any further movement of the screw this specially constructed “active” screw-tip-set shuts off after dosing. The shut-off process takes place immediately after dosing by means of a lead bolt, a pressure spring and a sealing cone.
The input housing serves to ensure precise processing within the barrel. The threaded bolt fixes the “active” screw-tip-set in the screw.
Conventional systems only become effective through the injection process and are passively closed by the occurring injection pressure.
