scholarly journals Infrared melt temperature measurement of single screw extrusion

2014 ◽  
Vol 55 (5) ◽  
pp. 1059-1066 ◽  
Author(s):  
J. Vera‐Sorroche ◽  
A.L. Kelly ◽  
E.C. Brown ◽  
P.D. Coates
Keyword(s):  
Temperature Measurement ◽  
Melt Temperature ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Screw Extrusion

SSEM-AG Computer Model for Optimization of Polymer Extrusion

2006 ◽  
Author(s):  
K. Wilczynski ◽  
A. Nastaj
Keyword(s):  
Power Consumption ◽  
Extrusion Process ◽  
Global Optimum ◽  
Optimization Techniques ◽  
Operating Conditions ◽  
Melt Temperature ◽  
Local Optima ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Screw Extrusion

The optimization of an extrusion process is a conflicting, multi-objective problem. It is complicated by the number of variables (screw/die geometry, operating conditions, material data) and their non-linear relations, as well as by the opposing criteria, for example extrusion throughput and power consumption. It is difficult to find the global optimum for the process avoiding local optima. There are two approaches to solve the problem, experimental and using a mathematical model of extrusion. Optimization techniques based on an experimentation are time-consuming and very expensive. In this paper we present an optimization methodology based on the Genetic Algorithms (AG), where response surface is given by the extrusion model. A mathematical Single-Screw Extrusion Model SSEM developed at the Warsaw University of Technology is used to predict the extruder behavior, and AG approach is used for optimization. An integrated SSEM-AG system was developed to study optimization of the single-screw extrusion process. Three design criteria (output variables) are selected for optimization: maximum extrusion throughput, minimum power consumption and low melt temperature. As input variables, screw speed, barrel temperature and screw channel depth are chosen.

scholarly journals A Computer Model of Starve Fed Single Screw Extrusion of Wood Plastic Composites

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1252
Author(s):  
Krzysztof J. Wilczyński ◽  
Kamila Buziak
Keyword(s):  
Computer Model ◽  
Wood Fiber ◽  
Experimental Studies ◽  
Melt Temperature ◽  
Wood Plastic Composites ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Plastic Composites ◽  
Screw Extrusion ◽  
Melting Mechanism

In this study, we present a computer model of starve fed single screw extrusion of wood plastic composites (WPC). Experimental studies have been performed on the extrusion of the polypropylene (PP) based composites with various wood fiber contents (WF). The melting mechanisms of the composites in the extruder have been observed, and melting models have been proposed for partially and fully filled sections of the screw. It was observed that in the partially filled section the material is melted by conduction, as in the case of extrusion of neat polymers. On the other hand, in the fully filled section, the Tadmor melting mechanism appears, which is different compared to the melting mechanism of neat polymers at starve fed extrusion, where dispersed melting is observed. Using the melting models, the global computer model of the process has been developed which makes it possible to predict the process flow, i.e., the polymer melt temperature and pressure, the polymer melting rate, and the degree of screw filling. To build the model, the specific forward/backward procedure was developed, which consists in determining “forward” the melting profile, and “backward” the pressure and screw filling profile. The temperature profile in the melting section is computed “forward”, while “backward” in the metering section. This procedure makes it possible to solve the crucial problem of modeling of the starve fed extrusion process, which is to find the location of the point where the screw is fully filled, and the pressure is developed. The model has been tested by pressure measurements in the extruder.

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