The role of the three functional areas of the plastic extruder
The melt passes through the compression section and enters the melting section and the metering section. It has been basically plasticized, and there is even an excess of 'shear heat'. To 'cool', to transfer excess heat away. Only when the heat loss of the screw barrel is large, the lost heat is occasionally replenished, so these two sections are called 'constant temperature zones'.
The melt enters the confluence core and the die, because the melt has begun to change from the spiral variable speed motion to the linear uniform motion when it reaches the confluence core, and the shear heat effect no longer exists. When the melt reaches the mouth die along the flow channel specified by the confluence core, part of the heat will be consumed. In order to ensure that the melt advances evenly along the dovetail groove flow channel of the die, it is necessary to add appropriate heat. For this purpose, the die design The fixed temperature is slightly higher, so it is called 'insulation zone'.
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