Heat Profile Reference Guide
% Shot Capacity |
Residence |
Heat Profile |
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Type |
Rear |
Center |
Front |
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25% or less |
2 min or more |
Ascending |
Resin (1) |
Average of Rear and Front Zones |
Melt Adj (3) |
25% or less |
Less than 2 min |
Flat |
Melt (2) |
Melt (2) |
Melt Adj (3) |
25 to 35% |
2 min or more |
Flat |
Melt (2) |
Melt (2) |
Melt Adj (3) |
25 to 35% |
Less than 2 min |
Hump |
Resin (1) |
Melt (2) + 30 to 45ºF |
Melt Adj (3) |
35 to 45% |
2 min or more |
Hump |
Resin (1) |
Melt (2) + 30 to 45ºF |
Melt Adj (3) |
35 to 45% |
Less than 2 min |
Reverse |
Melt (2) + |
Average of Rear and Front Zones |
Melt Adj (3) |
More than 45% |
2 min or more |
Reverse |
Melt (2) + |
Average of Rear and Front Zones |
Melt Adj (3) |
More than 45% |
Less than 2 min |
Reverse |
Melt (2) + |
Average of Rear and Front Zones |
Melt Adj (3) |
Notes:
- 1. Rear zone temperature recommended by the resin manufacturer
- 2. Desired melt temperature
- 3. Within a range of desired melt temp to 10ºF below desired melt temperature
Guidelines for Table
The guidelines for the initial heater band settings presented in the above table are for injection molding of non-reinforced thermoplastics with a shot size in the range of 25% to 75% of the machine capacity. It should be noted that residence times, screw RPM, additives and other factors are variables that must be considered when setting the heat profile.
Note: The heat profile guidelines described above provide a starting point and should be adjusted to produce the best melt quality at the lowest possible moldable temperature with all heater band zones cycling.
Reiloy Westland Corporation has developed a Heat Profile Decision Chart which can be used in identifying the correct heat profile for your process.
This easy to use flow chart takes you step by step through the process of balancing your heat energy sources in order to obtain the aim melt temperature.
To request a copy of the Heat Profile Decision Flow Chart, email us at reiloy@reiloyusa.com , or call 800-247-1144.