1. Lock out and tag the machine and controller (if equipped). For machine lockout and tag
procedures refer to the machine documentation.
2. Remove all traces of the original resin from the material feed equipment.
3. Depending on application restrictions, add one of the following to the material feed
equipment to reduce the cleaning time required:
• Purge compound
• Natural (uncolored) resin
• New colored resin
4. Remove all locks and tags.
5. Power up the machine and turn on the controller (if equipped).
WARNING!
Hot resin spray hazard – risk of serious injury. Molten resin under high pressure can
suddenly release and spray out from the machine nozzle. Before purging the injection unit,
clear the area of all non-essential personnel and wear personal protective equipment
consisting of a heat-resistant coat, heat-resistant gloves and a full face shield over safety
glasses.
6. Purge the injection unit until all traces of the old color are eliminated. For instructions, refer
to the machine manufacturer’s documentation.
7. Increase the injection speed to the maximum value allowed by the application.
8. Reduce the hold time and cooling time to the minimum values allowed by the application.
9. Increase the temperature of the hot runner nozzle tips, manifold and sprue by 20 to 30 °C (68
to 86 °F) .
10. Repeat step 3 to replenish the material feed system, if required.
11. Produce a series of test parts until all traces of the old color are eliminated.
12. When the color change is complete, decrease the temperature of the nozzle tips, manifold
and sprue by 20 to 30 °C (68 to 86 °F) .
13. Return the hold time, cooling time and injection speed back to their original values.
14. Fill the material feed equipment with the new resin.
6.4
Extending Nozzle and Sprue Heater Wire Leads
The following procedure describes how to install the nozzle and sprue heater lead splice kit (P/N
4047310) to extend the length of the nozzle and sprue heater wires. This kit may be required on
systems where the wire leads are not long enough to reach the electrical connectors.
Hot Runner Installation Manual v 2.2 — March 2021 Maintenance
Changing the Resin Color 67
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