BARREL TEMPERATURE PROFILE REFERENCE TABLE

Site hosted by Angelfire.com: Build your free website today!

BARREL TEMPERATURE PROFILE REFERENCE TABLE

%Shot Capacity (up to 75%)	Permissible Residence Time	TEMPERATURE PROFILE (for non reinforced thermoplastic polymers)
%Shot Capacity (up to 75%)	Permissible Residence Time	Type	REAR ZONE	CENTER ZONE	FRONT ZONE

30% or less	2 min. or more	Ascending	See note (1) Polymer	Average of Rear ∓mp; Front	See note (3) Desired Melt temp. range
25% or less	Less than 2 min.	Flat	See note (2) Melt	See note (2) Melt	See note (3) Desired Melt temp. range
20% to 40%	2min. or more	Flat	See note (2) Melt	See note (2) Melt	See note (3) Desired Melt temp. range
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
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
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
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
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
Notes: Rear zone temperature recommended by the polymer producer. Desired melt temperature. With in a range of desired melt temperature to 5 C below desired melt temperature.

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.

Back HOME