Discussion on N-Lamina Model of Non-Plug Flow Solid Conveying in Feeding Section by Single-Screw Extrusion Molding

This paper analyzed several important issues in theory of non-plug flow solid conveying, which is about the extrusion molding process of the single screw extruder, they are mainly: compressive stress on the front and rear ends of the surface, and ; an increase trend of compressive stress , ; pressure in feeding compression section of the screw, .

Non-Plug Solid Conveying Theory and Granule in Feeding Section by Single-Screw Extrusion Molding

This paper analyzed granule of non-plug flow solid conveying section, and found the theoretical basis of the calculation model of granule from soil mechanics, and derived the constitutive equation of granule in detail, etc. All this work expounds the main idea of non-plug solid conveying theory from one side, so as to get a glimpse of the theory.

Numerical Simulation of Extrusion Pressure of Non-Plug Flow Solid Conveying in Feeding Section

According to the theory of extrusion pressure by molding in barrel of the single screw extruder specially designed for pure UHMWPE, extrusion pressure generated during the process must be sufficient while extrusion molding with single-screw extruder. The mathematical model for formation of extrusion pressure in feeding section during single-screw extrusion molding has been established. This paper conducted a research on theory of extrusion pressure which is part of n-lamina model of non-plug flow solid conveying in feeding section by single-screw extrusion molding.

N-Lamina Model of Extrusion Pressure of Non-Plug Flow Solid Conveying in Feeding Section by Single-Screw Extrusion Molding

While extrusion molding with single-screw extruder, extrusion pressure comes into being from feeding section; it is one of the basic conditions to ensure that extrusion process can be carried on normally, in order to ensure molding process goes smoothly, it must meet the following requirement: extrusion pressure generated during the process must be sufficient. Therefore it has certain engineering significance to design structure of a single screw correctly that a mathematical model for formation of extrusion pressure during single-screw extrusion molding will have to be established. This paper conducted a research on theory of extrusion pressure when powder of pure UHMWPE resin is still in feeding section by molding in barrel of the single screw extruder specially designed for pure UHMWPE, and established a n-lamina model of powder materials or grain materials which is in feeding section and at the state of non-plug flow solid conveying, and it provided a method to calculate extrusion pressure of the n-lamina model, thus it enriched and perfected theory of single-screw extrusion molding.