PMMA (polymethyl methacrylate) injection screw barrels
 

• Specification

Screw diameter: Ø12-300MM L/D:15-55
Barrel diameter:  Ø25-500MM      Length:300-1000MM

• Material

38CrMoAlA(JIS SACM645)

Cr12MOV(JIS SKD-11) 
4Cr5MoSiV1(JIS SKD-61) 
42CrMo(AISI 4140)

9Cr18MoV
Stainless steel,etc.

• Parameter

Nitrided layer depth:0.50-0.80mm

Nitrided hardness: 900-1100HV

Nitrided brittleness: Less than 2 level

Surface roughness: Ra 0.4

Linearity of screw: 0.015mm

• Feature

PMMA has no special requirements of design for screw barrel. Because the melt viscosity is big, need deep screw slots and large diameter shoot nozzle holes to plasticizing in low temperature.