An extrusion screw relates to the technical field of extrusion screws for blow molding machines, comprising a feeding section, a melting section and a homogenizing section, as well as a mixing section connected behind the homogenizing section. The mixing section includes a rod body and preset groups of flow dividing and stirring parts arranged on the outer circumference of the rod body. Each flow dividing and stirring part is provided with a preset number of circles of rhombic flow dividing protrusions evenly distributed around the rod. The perpendicular bisector of the connecting line between adjacent protrusions on the same circle passes through one flow dividing protrusion on the adjacent circle. Radial stirring parts are arranged between the flow dividing and stirring parts, which are composed of stirring protrusions in preset circles. The outer edge of the stirring protrusion cross-section is arc-shaped, the central axis of the arc is parallel to the central axis of the rod body, and the stirring protrusions surround the rod periphery. The perpendicular bisector of the connecting line between two adjacent stirring protrusions on the same circle passes through one stirring protrusion on the adjacent circle. This extrusion screw achieves sufficient material mixing before extrusion to guarantee uniformity and improve the overall quality of blow molded products.
Area Code: CN
Application Number: CN201821590988.1
