In developing the Exospring nonreturn valve
, DPL have dispensed with the traditional spring assembly in the product flow.
There is a chance of more screw overtravel or larger effects from nonreturn valve
A properly trained Scientific Molder knows how to test machine performance in key areas, including load sensitivity (injection velocity control), pressure control (pack and hold), nonreturn valve
performance, temperature control, etc.
13,14] Optimal color mixing was predicted if an SM nonreturn valve
(NRV) was used after an ET screw.
Inadequate melting in conventional three-zone screws can affect part quality and cause increased wear on screw, barrel, and nonreturn valve