Common pipe extrusion molding heads have the following three forms:
1. Straight-through head, also known as flat head. The melt extrusion direction in the machine head is parallel or consistent with the axis of the extruder screw. It is the simplest, most economical and most commonly used machine head. The disadvantage is that the shunt traces produced by the shunt bracket are difficult to eliminate. 8.2.2 Typical structure of pipe extrusion molding head
2. Right-angle machine head, also called cross machine head or bent machine head. The melt extrusion direction in the machine head is at a 90° angle, which can effectively eliminate the shunt marks produced by the shunt and improve product quality. The disadvantage is that the design, processing and installation of the mandrel are difficult.
3. Side-type machine head, also known as tubular machine head. The molten material from the extruder needs to be turned twice (90° or 45°) to the machine head, and is extruded in a direction parallel to the screw axis. The advantage is that the plasticization of the molten material is enhanced and the product quality is improved. It is suitable for Production of large diameter pipes. The disadvantages are complex structure and high mold cost.