Evolution of The Extruder Screw-Disk Plasticizing System Construction

Abstract

The search for new polymer processing ways has become necessary due to the rapidly growing technology and market needs. The time of manufacturing products, as well as the impact of process parameters and the design itself on the properties of materials have become very important. Therefore, the creation of assumptions allowing the construction of a compact device whose construction will allow, for example, high process efficiency at low screw rotational speeds or a high degree of material homogenisation, is expected by the market. However, this requires the design of new or continuous modifications and improvements to existing structures.

Investigation of selected independent variables on extrusion of rice semolina with and without propeller

“…In the case without a propeller, three of the effects are statistically significant. After eliminating the nonsignificant effects, the following adequate equation was obtained for the change in sectional expansion index when extruding without a propeller: SEI1 = -42,891 + 0,371.Nf + 0,014.Nw -0,204.W (7) In the case with a propeller, three of the effects are statistically significant. After eliminating the nonsignificant effects, the following adequate equation was obtained for the change in sectional expansion index: SEI2 = 50,038 + 0,038.Nw -2,302.W -0,373.Tm -0,008.Nw.W + 0,021.W.Tm (8) The increase in the working screw speed in combination with low moisture content of the raw material leads to an increase in the sectional expansion index (Fig.…”

Effect of propeller use on residence time distribution (rtd) in single-screw cam-flow rice semolina extrusion

“…[4]. Two main methods are used to introduce a marker indicator into the system: pulse and step [5], [6]. Pulse experiments are the momentary introduction of a tracer through an orifice into the system during the process.…”