Why screws with a gradually increasing compression are not recommended for extrusion polyamide 66 ?

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Martin Chandler

Because Nylon 6 and 66 have a close melting range and lowish melt viscosity it is common practice to use a rapid transition screw to ensure good mixing

Karingamanna Jayanarayanan

Nylons are highly shear sensitive. Higher shear forces will be imparted if a long compression zone is maintained. Usually the compression zone will have two or three flights in the case of nylon screws. The sharp drop in the viscosity is the reason for going for short compression zones