Fundamentals of Global Modeling for Polymer Extrusion

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

doi:10.3390/polym11122106

Cited by 65 publications

(64 citation statements)

References 194 publications

(273 reference statements)

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“…The state-of-the-art for modeling of extrusion was presented in some fundamental books, e.g., by Rauwendaal [43], White and Potente [44], Tadmor and Gogos [45], Osswald and Hernandez-Ortiz [46], and Agassant et al [47], as well as in some papers, e.g., [48][49][50][51][52]. Wilczyński et al summarized and discussed this in a review paper [53].…”

Section: Flood Fed Vs Starve Fed Extrusionmentioning

confidence: 99%

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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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Section: Flood Fed Vs Starve Fed Extrusionmentioning

confidence: 99%

“…A forward scheme of computations for flood fed extrusion and a backward scheme of computations for starve fed extrusion[53].…”

mentioning

confidence: 99%

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

Nastaj

Wilczyński

2020

Polymers

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“…Computational modeling was used to understand flow and mixing behavior in extrusion screws with different thread cuts. Several specialized design features have been reported to modify these flows with the aim of improving mixing (19). Some features divide and re-combine the fluid multiple times to distribute materials being mixed more evenly, while others shear the materials in tight spaces to break aggregates.…”

Section: Design Of the Extrusion Screwmentioning

confidence: 99%

A hybrid additive manufacturing platform to create bulk and surface composition gradients on scaffolds for tissue regeneration

Sinha

Cámara-Torres

Scopece³

et al. 2020

Preprint

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Scaffolds with gradients of physico-chemical properties and controlled 3D architectures are crucial for engineering complex tissues. These can be produced using multi-material additive manufacturing (AM) techniques. However, they typically only achieve discrete gradients using separate printheads to vary compositions. Achieving continuous composition gradients, to better mimic tissues, requires material dosing and mixing controls. No such AM solution exists for most biomaterials. Existing AM techniques also cannot selectively modify scaffold surfaces to locally stimulate cell adhesion. We report a hybrid AM solution to cover these needs. On one platform, we combine a novel dosing-and mixing-enabled, dual-material printhead with an atmospheric pressure plasma jet to selectively activate/coat scaffold filaments during manufacturing. We fabricated continuous composition gradients in both 2D hydrogels and 3D thermoplastic scaffolds. We demonstrated an improvement in mechanical properties of continuous gradients compared to discrete gradients in the 3D scaffolds, and the ability to selectively enhance cell adhesion.

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“…Computational modeling was used to understand ow and mixing behavior in extrusion screws with different thread cuts. Several specialized design features have been reported to modify these ows with the aim of improving mixing [16] . Some features divide and recombine the uid multiple times to distribute materials being mixed more evenly, while others shear the materials in tight spaces to break aggregates.…”

Section: Design Of the Extrusion Screwmentioning

confidence: 99%

A hybrid additive manufacturing platform to create bulk and surface composition gradients on scaffolds for tissue regeneration

Sinha

Cámara-Torres

Scopece³

et al. 2020

Preprint

View full text Add to dashboard Cite

Scaffolds with gradients of physico-chemical properties and controlled 3D architectures are crucial for engineering complex tissues. These can be produced using multi-material additive manufacturing (AM) techniques. However, they typically only achieve discrete gradients using separate printheads to vary compositions. Achieving continuous composition gradients, to better mimic tissues, requires material dosing and mixing controls. No such AM solution exists for most biomaterials. Existing AM techniques also cannot selectively modify scaffold surfaces to locally stimulate cell adhesion. A hybrid AM solution to cover these needs is reported here. A novel dosing- and mixing-enabled, dual-material printhead and an atmospheric pressure plasma jet to selectively activate/coat scaffold filaments during manufacturing were combined on one platform. Continuous composition gradients in both 2D hydrogels and 3D thermoplastic scaffolds were fabricated. An improvement in mechanical properties of continuous gradients compared to discrete gradients in the 3D scaffolds, and the ability to selectively enhance cell adhesion were demonstrated.

show abstract

Fundamentals of Global Modeling for Polymer Extrusion

Cited by 65 publications

References 194 publications

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

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

A hybrid additive manufacturing platform to create bulk and surface composition gradients on scaffolds for tissue regeneration

A hybrid additive manufacturing platform to create bulk and surface composition gradients on scaffolds for tissue regeneration

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