The main parameters of the feeding section screw of the extruder of the melt blown cloth machine:

The spiral elevation angle ψ is generally 17 ° ~ 20 °.

The groove depth H1 is calculated from the geometric compression ratio ε of the screw after determining the groove depth of the homogenization section.

The length L1 of the feeding section is determined by the empirical formula:

For non-crystalline polymer L1 = (10% ~ 20%) L

For crystalline polymer L1 = (60% ~ 65%) L