The main part of the pin screw is a common screw which can be arranged in the melting section of the screw or in the groove of the measuring section or the smooth cylindrical surface without the groove at the end of the measuring section. Pins set by a certain way, can be density ranging from the number of ranging. Cylindrical pins are formed by fitting the pins into the holes of the screw; the square or diamond pins are formed directly on the screw.
If the pins are arranged in the melting zone, the pin can break the solid bed, destroy the two-phase flow, the solid, liquid phase together, so that the end of the solid phase and the bulk of the material contact area increased, Melted. If the pin is set in the melt transport area, its main role is to split the stream, increase the interface, change the direction of the flow, so that the beam rearrangement. Multiple shunt, confluence, change the direction of flow, so that the melt components and temperature homogenization.
The mixing section is an inward grooved structure provided at the end of the ordinary screw homogenization section, and its outer diameter is equal to the outer diameter of the screw. The trenches are divided into groups, each of which is a confluence area of the material. Material is divided by trenches, to the convergence area exchange, and then split, convergence, the principle is similar to the pin-type.
Separate screw is characterized by the melting section in addition to the original one screw (called the main screw), but also attached a thread (called additional thread), the outer diameter of the main thread is slightly smaller than the main thread In the case of a lead, the secondary thread begins at the end of the feed section (and is associated with the feed section), and after several threads, it gradually intersects the main thread of the homogenization section.
The screw groove depth and thread lead from the feeding section to the homogenization of the end are gradually changing, both the thread lead from the width gradually narrowed, the depth of the groove gradually from the depth of shallow, the material can be the largest compression.