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

Compression ratio ε: generally refers to the geometric compression ratio, which is the ratio of the volume of the first screw groove in the feeding section of the screw and the volume of the last screw groove in the homogenization section.

ε = (Ds-H1) H1 / (Ds-H3) ≈H1 / H3

In the formula, H1--the depth of the first screw groove of the feeding section

H3--The depth of the last groove of the homogenization section

The length L2 of the melting section is determined by the empirical formula:

For non-crystalline polymer L2 = 55% ~ 65% L

For crystalline polymer L2 = (1 ~ 4) Ds