Heat Profile Reference Guide

% Shot Capacity

Residence
Time

Heat Profile

Type

Rear
Zone

Center
Zone

Front
Zone

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) +
30 to 45ºF

Average of Rear and Front Zones

Melt Adj (3)

More than 45%

2 min or more

Reverse

Melt (2) +
30 to 45ºF

Average of Rear and Front Zones

Melt Adj (3)

More than 45%

Less than 2 min

Reverse

Melt (2) +
40 to 60ºF

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.

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