Head and die of extruder equipment

The machine head and the die are usually integrated as a whole, and it is customary to collectively refer to the machine head; however, there are also cases where the machine head and the die are separated. The function of the machine head is to convert the plastic melt in rotating motion into parallel linear motion, so that the plastic can be further plasticized evenly, and the melt can be introduced into the die evenly and smoothly. It also provides the necessary molding pressure to make the plastic easy to form and The resulting product is dense. The die is a channel with a certain cross-sectional shape. The plastic melt obtains the desired shape when flowing in the die, and is cooled and hardened by the shaping device and cooling system outside the die to form. The components of the machine head and die include filters, porous pulleys, diverters (sometimes it is combined with the mold core into one component), mold core, die and machine neck.
The porous plate in the machine head can center the machine head and the barrel, support the filter (to filter out insoluble impurities in the melt), and generate back pressure on the melt. There is also a correction and adjustment device (positioning screw) in the machine head, which can adjust and correct the concentricity, size and shape of the mold core and the die. When producing tubes or blown films, compressed air is introduced through the machine neck and mold core. According to whether there is an angle between the material flow direction and the center line of the screw, the machine head can be divided into a right-angle machine head (also called a T-shaped machine head) and an angled machine head (right angle or other angle). The right-angle machine head is mainly used for extruding pipes, sheets and other profiles, while the angle-type machine head is mostly used for extruding films, cable coatings and blow molded products.