10-2
Dura+ User Manual
SYSTEM STARTUP AND SHUTDOWN
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
10.2 Startup
WARNING
Take appropriate safety precautions by assuming the system is pressurized
and hot at all times.
When the mold is open never inject material through Hot Runner system
under high pressure.
Failure to do so can result in serious injury or death.
The correct startup procedure for your Hot Runner system depends on the
type of system:
• Standard systems: see “10.2.1 Standard Hot Runner Systems” on
• Stack mold systems: see “10.3.2 Stack Mold System” on page 10-4
10.2.1 Standard Hot Runner Systems
CAUTION
Failure to follow this procedure may result in leakage / damage occurring in
the Hot Runner.
CAUTION
IMPORTANT
When running thermally sensitive materials, use a thermally stable material
as recommended by the material supplier for the initial startup.
1. Heat up all Hot Runner manifolds and / or bridges and inlets (excluding
the nozzles) to processing temperature.
2. Begin nozzle heating when the manifolds and / or bridges have come
within 50°C of processing temperature.
IMPORTANT
Wait until ALL heating zones have reached processing temperature for
5 minutes before continuing.
For Hot Runner systems using heater plates, allow 10 minutes of soak time
after the system reaches processing temperature.
3. Startup for empty Hot Runner system: extrude material through the Hot
Runner system using 200 PSI (14 bar) of back pressure.
4.
Startup for systems filled with material: purge intended shot size twice
from the barrel prior to bringing the machine barrel forward to the Hot
Runner interface.
5. Set injection time and pressure according to part size, gate size and
material.