The gap between the screw and the barrel of the injection molding machine is a parameter of the relationship between the screw and the barrel.

First, the factors considered in the gap selection:

1) The nature of the material being processed. (such as heat sensitive and non-heat sensitive materials)

2) Head resistance. The greater the resistance, the smaller the gap.

3) Material of screw barrel and heat treatment

4) Machining conditions

5) Select the size of the screw diameter of the injection molding machine. In general, the larger the diameter of the screw, the larger the absolute value of δ should be selected. The smaller the diameter of the screw, the smaller the absolute value of δ should be selected. The selection of the clearance δ between the screw and the barrel is a comprehensive problem and must be considered in combination with various factors.

Second, the diameter of the gap that has been selected by the extruder series in China can be selected according to the situation.

δ=(0.003—0.005)D The larger the diameter, the smaller the value. The smaller one takes the larger value.