about extruder single screw design

can someone explain please the major difference between a screw which is designed for *PP* but it is not working on *HDPE*. share best design for HDPE
material Thanks From irfan snipped-for-privacy@yahoo.com
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can someone explain please the major difference between a screw which is designed for *PP* but it is not working on *HDPE*. share best design for HDPE material Thanks From irfan snipped-for-privacy@yahoo.com
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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