BARREL TEMPERATURE PROFILE REFERENCE TABLE

%Shot Capacity

(up to 75%)

Permissible

Residence Time

TEMPERATURE PROFILE

(for non reinforced thermoplastic polymers)

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

Various types of Temperature Profiles for Barrel

To see typical barrel temperature setting CLICK HERE.


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