BARREL TEMPERATURE PROFILE REFERENCE TABLE
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%Shot Capacity (up to 75%) |
Permissible Residence Time |
TEMPERATURE PROFILE (for non reinforced thermoplastic polymers) |
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Type |
REAR ZONE |
CENTER ZONE |
FRONT ZONE |
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30% or less |
2 min. or more |
Ascending |
See note (1) Polymer |
Average of Rear ∓mp; Front |
See note (3) Desired Melt temp. range |
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25% or less |
Less than 2 min. |
Flat |
See note (2) Melt |
See note (2) Melt |
See note (3) Desired Melt temp. range |
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20% to 40% |
2min. or more |
Flat |
See note (2) Melt |
See note (2) Melt |
See note (3) Desired Melt temp. range |
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20% to 40% |
Less than 2 min. |
Hump |
See note (1) Polymer |
See note (2) Melt + 15 to 20 C |
See note (3) Desired Melt temp. range |
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25% to 60% |
2min. or more |
Hump |
See note (1) Polymer |
See note (2) Melt + 15 to 20 C |
See note (3) Desired Melt temp. range |
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25% to 60% |
Less than 2 min. |
Reverse |
See note (2) Melt +15 to 20 C |
Average of Rear ∓mp; Front |
See note (3) Desired Melt temp. range |
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More than 60% |
2min. or more |
Reverse |
See note (2) Melt +15 to 20 0C |
Average of Rear ∓mp; Front |
See note (3) Desired Melt temp. range |
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More than 60% |
Less than 2 min. |
Reverse |
See note (2) Melt +20 to 30 0C |
Average of Rear ∓mp; Front |
See note (3) Desired Melt temp. range |
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Notes:
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You may observe the following in the table;
- An ascending temperature profile is required for polymers with high thermal stabilty of more than 4 min. when the actual shot is lower than 30% of maximum shot size of the machine. Therefore, this profile can not be suitable for reinforced and filled polymers as their thermal stability is medium.
- A flat temperature profile is required for the shot range between 20% to 40% ranges for the polymers with medium thermal stability.
- A hump temperature profile is required for the polymers with thermal stability between 2 to 4 min. when the actual shot is in range between 25% to 60% of the maximum shot capacity of the machine.
A reverse temperature profile is required for the heat and shear sensitive polymers (with less than 2 min. thermal stability) when the actual shot is over 60% of the maximum shot capacity of the machine
Various types of Temperature Profiles for Barrel
To see typical barrel temperature setting CLICK HERE.