A composite model for an intermeshing counter‐rotating twin‐screw extruder and its experimental verification

Lewandowski, A.; Wilczyński, Krzysztof; Nastaj, Andrzej

doi:10.1002/pen.24175

Cited by 30 publications

(33 citation statements)

References 26 publications

(37 reference statements)

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“…Modelowanie globalne obejmuje kompletny opis procesu wytłaczania z uwzględnieniem: transportu tworzywa w stanie stałym, uplastyczniania tworzywa oraz przepływu uplastycznionego tworzywa (w cylindrze i głowicy wytłaczarki) [10,11,14,16]. Takie modelowanie wymaga całościowych obliczeń (w wielokrotnych pętlach iteracyjnych) w celu określenia punktu pracy wytłaczarki, definiowanego natężeniem przepływu tworzywa (wydajnością wytłaczania) i ciśnieniem wytłaczania.…”

Section: Modelowanie Globalne Procesu Wytłaczaniaunclassified

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Computer modeling for polymer processing. Counter-rotating twin screw extrusion – nonconventional screw configurations

Lewandowski¹,

Wilczyński²

2016

Mechanik

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Przedstawiono zagadnienie komputerowego modelowania procesu wytłaczania dwuślimakowego przeciwbieżnego z zastosowaniem niekonwencjonalnych układów ślimakowych. Podano przykłady trójwymiarowego, nienewtonowskiego modelowania wybranych elementów niekonwencjonalnych. Zastosowano ogólnie zorientowany pakiet programów obliczeniowej mechaniki płynów CFD (computational fluids dynamics) -ANSYS Polyflow. Opisano metodę globalnego modelowania wytłaczania przeciwbieżnego, które ujmuje ten proces całościowo, z uwzględnieniem transportu tworzywa w stanie stałym, uplastyczniania tego tworzywa oraz jego przepływu po uplastycznieniu. Metoda ta bazuje na bezwymiarowych charakterystykach przepływowych ślimaków, definiujących zależności bezwymiarowego natężenia przepływu tworzywa i bezwymiarowego gradientu ciśnienia. SŁOWA KLUCZOWE: polimery, wytłaczanie dwuślimakowe, modelowanieComputer modeling of counter-rotating twin screw extrusion with the use of nonconventional screw configurations has been presented. Some examples of three-dimensional, non--Newtonian modeling are shown. CFD generally oriented software ANSYS Polyflow has been used for modeling. Global modeling of counter-rotating extrusion is discussed which describes the process considering solid transport, melting and melt flow. The basis of this approach were screw pumping characteristics which defined the dimensionless flow rate and dimensionless pressure gradient.

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Section: Modelowanie Globalne Procesu Wytłaczaniaunclassified

“…Ten model został następnie rozwinięty, m.in. przez modelowanie numeryczne MES (z wykorzystaniem metod elementów skończonych) [13,14]. Ostatnio zespół z udziałem autorów opracował pierwszy i na razie jedyny model wytłaczania jednoślimakowego z dozowanym zasilaniem wytłaczarki [15,16].…”

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Computer modeling for polymer processing. Counter-rotating twin screw extrusion – nonconventional screw configurations

Lewandowski¹,

Wilczyński²

2016

Mechanik

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“…And finally, the composite models of solids conveying, melting and melt flow in a closely intermeshing counter‐rotating twin screw extruder have been developed . Recently, the composite model has been improved by FEM computations for the melt flow, and validated experimentally .…”

Section: Introductionmentioning

confidence: 99%

Experimental study of melting of polymer blends in a starve fed single screw extruder

Wilczyński

Lewandowski

2016

Polymer Engineering & Sci

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Experimental study is presented of the melting mechanism of polymer blends in a starve fed single screw extruder. Various polyblends were investigated such as PP/PS, HDPE/PS, and PP/PMMA. “Screw pulling‐out” technique was used to study the solid conveying, melting mechanism, and extent of starvation. It has been concluded that melting mechanism consists of two stages: conductive melting in the starve fed region and dispersed melting in the fully filled region. Substantial differences between melting of neat polymers and polymer blends were observed. In the case of polyblends, in the starved region a mixture of two solid polymers is melted by conduction, and in the fully filled region a dispersion of one or two solid polymers in a molten matrix is observed. Although contiguous solids melting mechanism was not seen for starve fed extrusion of polyblends, it was clearly observed for flood fed extrusion. Melting action seems to be faster for starve fed extruders than for flood fed machines, since the polyblend granules are not compacted into a dense solid bed. It was observed the pressure considerably decreases with level of starvation. Filling of the screw increases with an increase of the feed rate of polyblend, and decreases with an increase of the screw speed. Global modeling of the starve fed single screw extrusion of polyblends has been discussed. POLYM. ENG. SCI., 56:1349–1356, 2016. © 2016 Society of Plastics Engineers

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“…Up to date, there is a lack of optimization studies on single screw extrusion with metered feeding (starve fed extrusion) and counter-rotating twin screw extrusion, although the mathematical models of these global models for starve fed single screw extrusion [30][31][32] and global models for counter-rotating extrusion [33][34][35][36][37] have been recently developed.…”

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confidence: 99%

Optimization for Starve Fed/Flood Fed Single Screw Extrusion of Polymeric Materials

Nastaj

Wilczyński

2020

Polymers

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A novel computer optimization system for flood fed/starve fed single screw extrusion of polymeric materials has been developed. This coupled system allows us to optimize single screw extrusion both flood fed and starve fed. Optimization is based on process simulation which is performed using global extrusion model GSEM (Global Screw Extrusion Model). The process is optimized with the use of GASEO (Genetic Algorithms Screw Extrusion Optimization) procedures which were developed using Genetic Algorithms. An example of optimization of extrusion process parameters has been presented to maximize extrusion output and minimize specific energy consumption. Optimization has been performed in a unique and original way in a coupled manner when both modes of feeding were allowed. The studies have shown that the optimal process is extrusion with starving. In this case, the global objective function reached the highest value, and extrusion throughput was relatively high and specific energy consumption was minimal.

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A composite model for an intermeshing counter‐rotating twin‐screw extruder and its experimental verification

Cited by 30 publications

References 26 publications

Computer modeling for polymer processing. Counter-rotating twin screw extrusion – nonconventional screw configurations

Computer modeling for polymer processing. Counter-rotating twin screw extrusion – nonconventional screw configurations

Experimental study of melting of polymer blends in a starve fed single screw extruder

Optimization for Starve Fed/Flood Fed Single Screw Extrusion of Polymeric Materials

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