Screw combination foundation - threaded component


The conveying element is threaded and its function is t […]

The conveying element is threaded and its function is to transport materials (including liquid materials). The shape of the groove can be rectangular and a special shape (engagement type) generated according to the principle of relative motion. The threaded element can be divided into two types: forward and reverse, and can be divided into single-head, double-head and three-start thread elements.

Single threaded component

The solids transporting capacity is generally used in the feeding section to improve the amount of extrusion to be limited by the amount of feed and to transport materials with poor fluidity, such as low density materials. It is generally used to transport materials with a particle size similar to water during the reaction process. It can also be used for the discharge section. The output capacity of single-head threads is greater than that of multi-start threads, and the torque is also greater than that of multi-start threads. The mixing characteristics are more than that of multi-start threads.

Double thread and three thread

At the same center moment, D/D. It is relatively large and has a deep groove depth, so it can provide a lower shear rate at the same screw speed, and is more suitable for processing powder materials, especially low-density powder, glass fiber and other shear-sensitive materials. . With the same shear stress and torque, the two-start threaded element can operate at higher speeds with higher productivity. The three-threaded component can apply a higher average shear rate and shear force to the material at the same screw speed. In addition, due to the shallow groove and thinner material layer, the three-head heat transfer performance is better than the two-head heat transfer. The material is plasticized and melted. However, because of the strong shear, it is generally not easy to use for shear sensitive materials such as glass fiber and PVC.