Abstract: The fiber brakeage in compounding glass fiber-reinforced nylon-66 with different screw assemblies of the co-rotating twin screw extruder was studied, and the change rule of the fiber length in the extruding direction was analyzed by sampling along the screw axis. The effect of different screw assemblies on mechanical properties of the composite was also studied, and the optimal screw assembly was designed. The result shows that the proper screw assembly could improve the residual fiber length and the mechanical property of the composite effectively.

Key words: screw assembly, glass fiber, polyamide66, fiber length, mechanical property