Conveying element of nitrogen fluron screw thread element


Conveying element of nitrogen fluron screw thread element

The conveying element of the nitrogen fluron screw is thread-shaped, and its function is to convey materials (including liquid materials)

. The shape of the screw groove can be rectangular and special shape (meshing type) generated according to the principle of relative motion. The threaded elements are divided into forward and reverse, and can be divided into single-head, double-head and three-head threaded elements.

Single-head threaded components: with efficient solid conveying capacity, generally used in the feeding section, to improve the amount of extrusion is limited by the amount of feeding and used to transport poor fluidity of materials, such as low density materials. It is generally used to transport materials with particle size similar to water in the process of reaction processing, and can also be used in the discharge section. The output capacity of single-head thread is greater than that of multi-head thread, and the torque is also greater than that of multi-head thread, and its mixing characteristics are more than that of multi-head thread.

Double-start threads and three-start threads are compared: D/D at the same central moment. It is relatively large and deep, so it can provide a lower shear rate under the same nitrogen fluorine screw speed of the injection molding machine, which is more suitable for processing powder materials, especially low bulk density powder, glass fiber and other shear sensitive materials. Compared with the three-threaded element, under the same shear stress and torque, the two-threaded element can work at a higher speed and higher production capacity. The three-head threaded element can exert a higher average shear rate and shear force on the material under the same nitrogen fluron screw speed of the injection molding machine. In addition, due to the shallow screw groove and the thinning of the material layer, the three-head has better heat transfer performance than the two-head, which is beneficial to the plasticization and melting of the material. However, because of the strong shear, it is generally not easy to be used for the processing of shear-sensitive materials, such as glass fiber and PVC.

Lead variation and characteristics:

In the injection molding machine nitrogen fluorine dragon screw combination, for the output-based occasions, choose a larger lead thread, is conducive to improve the output, the heat-sensitive polymer extrusion, choose a large lead, can shorten the material residence time, reduce the thermal degradation of materials.

The thread lead has a great influence on the extrusion volume, mixing characteristics and torque. Generally speaking, the thread lead increases, the extrusion volume of the nitrogen fluorine dragon screw of the injection molding machine increases, the residence time of the material decreases, and the mixing effect of the material is relatively reduced. The torque is also smaller.

For mixing-based occasions, the thread with a medium lead is selected, and for the threads of different working areas of the nitrogen fluron screw of the injection molding machine, the lead is a combination of gradually decreasing, which is mainly used for the output and pressurization of solid materials, thus improving the melting speed or mixing physicochemical speed and extrusion stability.

Keywords: Conveying element of nitrogen fluron screw thread element

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