Approach to develop a screw configuration for compounding solid fillers on a twin screw extruder using the example of polyethylene-layered silicate masterbatches

Michaeli, Walter; Elas, Athanassios; Puch, Florian

doi:10.1515/polyeng.2011.082

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Afterwards, the screw root increases its diameter to build up pressure again [19]. Studies even present vacuum venting extruders, which could be so effective at removing the volatiles and the moisture that the drying step can be skipped [20]. In order to enhance a homogenous melt, mixing components are used [21].…”

Section: Extrusion Of Petmentioning

confidence: 99%

Manufacturing of a PET Filament from Recycled Material for Material Extrusion (MEX)

et al. 2022

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Due to its low cost and easy use, the use of material extrusion (MEX) as an additive manufacturing (AM) technology has increased rapidly in recent years. However, this process mainly involves the processing of new plastics. Combining the MEX process with polyethylene terephthalate (PET), which offers a high potential for mechanical and chemical recyclability, opens up a broad spectrum of reutilization possibilities. Turning used PET bottles into printable filament for MEX is not only a recycling option, but also an attractive upcycling scenario that can lead to the production of complex, functional parts. This work analyzes the process of extruding recycled PET bottle flakes into a filament, taking different extrusion screws and extrusion parameters into account. The filament is subsequently processed with MEX into tensile tests. An accompanying thermal, rheological and mechanical characterization of the recycled resin is performed to offer a comparison to the virgin material and a commercially available glycol modified polyethylene terephthalate (PETG) filament. The results show the importance of adequate drying parameters prior to the extrusion and the sensitivity of the material to moisture, leading to degradation. The recycled material is more prone to degradation and presents lower viscosities. Mechanical tests display a higher tensile strength of the recycled and virgin resin in comparison to the PETG. The extrusion of the used PET into a filament and the subsequent printing with the MEX process offers a viable recycling process for the discarded material.

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Section: Extrusion Of Petmentioning

confidence: 99%

Manufacturing of a PET Filament from Recycled Material for Material Extrusion (MEX)

et al. 2022

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“…Graphene interacts badly with this kind of matrices due to the low interaction energy between graphene and non-polar matrices [36][37]. Although the use of graphene as a functional filler in polymers show good results in laboratory scale experiments in a laboratory mixer, the dispersion of fillers in nanometer scale during a continuous melt compounding process is key to transfer the potential of these fillers to the industrial practice [38][39]. Due to economic aspects, the residence time of the polymer and the used fillers is limited during the compounding process.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the mechanical, rheological and thermal properties of graphene filled Polypropylene composites produced in a twin-screw extruder.

Adamy¹

2019

Zeitschrift Kunststofftechnik

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Mechanical, rheological and thermal properties of extruded graphene filled PP composites produced in a twin-screw extruder In this study, graphene reinforced Polypropylene nanocomposites were produced by using a twinscrew extruder in industrial scale, which achieves a lower energy input compared to laboratory scale experiments. The degree of dispersion and the resulting material properties are the focus of this study. Different graphene and graphene oxide types with different specific surfaces and filler contents are used for this purpose. The analysis of the dispersion of the nanofillers shows agglomerates in the matrix. Both the crystallinity and crystallization temperature of the PP is influenced significantly through the adding of graphene, while melting temperature is not being affected strongly. Young´s modulus increases with increasing filler content, whereas tensile strength is not improved by the adding of the used graphene types. Mechanische, rheologische und thermische Eigenschaften von extrudierten graphenbasierten PP-Kompositen In dieser Studie wurden graphenbasierte Polypropylen-Komposite unter industrienahen Bedingungen mithilfe eines Doppelschneckenextruders hergestellt, der im Vergleich zu Laborversuchen einen geringeren Energieeintrag erzielt. Der Dispergierungsgrad und die resultierenden Materialeigenschaften stehen im Fokus dieser Studie. Hierfür werden verschiedenen Graphen-und Graphenoxid-Typen mit unterschiedlichen spezifischen Oberflächen und Füllstoffanteilen eingesetzt. Die Analyse der Dispergierung zeigt deutliche Agglomerate in der Matrix. Im Gegensatz zur Schmelztemperatur werden sowohl die Kristallinität als auch die Kristallisationstemperatur durch die Zugabe von Graphen signifikant beeinflusst. Der Zug-E-Modul nimmt mit steigendem Füllstoffgehalt zu, während die Zugfestigkeit durch die Zugabe des verwendeten Graphens nicht gesteigert wird.

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“…Even though nanofillers show good results in laboratory scale experiments, there are only few commercial applications of nanofillers. Dividing and dispersing nanofiller‐agglomerates during the melt compounding process is of great importance . During the industrial processing of composites with nanofillers, they tend to agglomerate, leading to a loss of their positive properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Processing Conditions on the Morphology and the Mechanical Properties of Polyamide 6‐Carbon Fibre‐Carbon Nano Tube‐Compounds

Michaeli

Hopmann

Puch

2014

Macromolecular Symposia

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Summary Polyamide 6‐compounds containing carbon nano tubes and carbon fibres are prepared by melt compounding. To investigate the influence of the processing conditions on the mechanical properties and the morphology of carbon fibre reinforced polyamide 6‐nanocomposites the process parameters are varied while preparing the compounds. The processing conditions affect the mechanical properties and the morphology. The investigations reveal, that a micro‐nano‐compound with a PA6‐matrix should be compounded at a maximum barrel temperature of 260 °C, a throughput of 15 kg/h at a screw speed of 500 min−1 and a screw configuration, which introduces a low amount of shear energy into the compound. These processing conditions lead to a comparatively high specific mechanical energy input of 334 Wh/kg and to the best set of mechanical properties of the investigated materials. However, the morphology of the investigated carbon fibre reinforced nanocomposites does not show significant differences and has to be further investigated.

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Approach to develop a screw configuration for compounding solid fillers on a twin screw extruder using the example of polyethylene-layered silicate masterbatches

Cited by 6 publications

References 14 publications

Manufacturing of a PET Filament from Recycled Material for Material Extrusion (MEX)

Manufacturing of a PET Filament from Recycled Material for Material Extrusion (MEX)

Experimental investigation of the mechanical, rheological and thermal properties of graphene filled Polypropylene composites produced in a twin-screw extruder.

Influence of the Processing Conditions on the Morphology and the Mechanical Properties of Polyamide 6‐Carbon Fibre‐Carbon Nano Tube‐Compounds

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