Verarbeitung von Kunststoffen zu Bauteilen

Schüle, Helmut; Eyerer, Peter

doi:10.1007/978-3-662-59841-2_1

Cited by 2 publications

(2 citation statements)

References 47 publications

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“…Within the first section, the feed section, the solid polymer is taken up as granules by the hopper. At a constant passage depth, the material is conveyed, compacted and preheated for the next zone [13]. The driving force in the direction of the screw tip arises from The aim of this research is to establish correlations between process parameters, melt quality and product quality.…”

Section: The Three-section Screw and Barrier Screwmentioning

confidence: 99%

Determination of Correlations between Melt Quality and the Screw Performance Index in the Extrusion Process

Trienens,

Schöppner,

Bunse

2023

Polymers

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For polymer-processing extruders, designing screws via analytical computational models is helpful for reducing experimental costs. However, the current simulation programs cannot predict the melt quality at the screw tip with sufficient accuracy. There are a number of definitions of melt quality in the literature. This paper will review some of these definitions and present how melt quality can be assessed in subsequent work. In this paper, both the thermal and material homogeneity of the melt quality are examined for correlations with the screw performance index. If correlations exist with the screw performance index determined from direct experimental measurement data, these can be used as target values for developing a melt quality prediction model.

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Section: The Three-section Screw and Barrier Screwmentioning

confidence: 99%

Determination of Correlations between Melt Quality and the Screw Performance Index in the Extrusion Process

Trienens,

Schöppner,

Bunse

2023

Polymers

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“…(Multi)manifold dies are suitable for the extrusion of materials with quite different viscosities, since the shorter dwell time means that less flow instabilities can develop in the die. The disadvantages of the (multi)manifold system are the high investment cost and the higher adaptation effort to existing technology compared to the feedblock system [3,4]. Thus, feedblock systems are mainly used for coextrusion.…”

Section: Introductionmentioning

confidence: 99%

Two Layer Sheets for Processing Post-Consumer Materials

Wittmann

Drummer

2022

Polymers

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An increasing percentage of post-consumer materials (PCR) is becoming more and more important in all processing methods in polymer technology, also due to the lack of raw materials and political demands. Very special requirements are placed on material properties such as viscosities in extrusion. Low viscosities and the presence of particles affect extrusion in a negative manner. In this study, the use of multilayer sheets is determined to both ensure extrudability and contribute to a significant improvement in surface qualities. The focus is placed on the influence of viscosity and particles on mono- und multilayer sheet quality. Therefore, two different virgin materials with a melt flow rate (MFR) of 3 g/10 min and 6 g/10 min and two different PCR materials with a MFR of 16 g/10 min and 50 g/10 min are processed both in monolayers and in two layer sheets. Rheological investigations, optical analysis, and film thickness distributions are used to show the relationship between matrix viscosity and particles. The results show that the use of multilayer extrusion can improve both extrudability and sheet quality, so that multilayer sheets can offer a significant potential in the processing of PCR materials.

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Verarbeitung von Kunststoffen zu Bauteilen

Cited by 2 publications

References 47 publications

Determination of Correlations between Melt Quality and the Screw Performance Index in the Extrusion Process

Determination of Correlations between Melt Quality and the Screw Performance Index in the Extrusion Process

Two Layer Sheets for Processing Post-Consumer Materials

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