Simulation of Non-Isothermal Non-Newtonian Flow Behavior of PP for Various Injection Molding Screws and Comparison with Experimental Results

Park, Seong-Yeol; Lyu, Min‐Young

doi:10.1007/s13233-018-6093-1

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…The author concluded that the MBS screw is particularly adequate, albeit its relatively limited melting efficiency. The importance of the feed-barrier transition on flow stability was well illustrated by Park and Lyu [12] through the calculation of streamlines and velocity vectors in this region.…”

Section: Introductionmentioning

confidence: 74%

“…A numerical approach based on finite-difference approximation schemes was developed, but little detail was given on the model implementation. With the aim of comparing the performance of various screw profiles, Park and Lyu [12] calculated pressure, temperature, velocity and streamlines in barrier screws, assuming non-Newtonian non-isothermal flow and using the Polyflow® commercial software. However, only the presence of melt was taken into consideration, even if the authors recognized -and observed experimentally -that melt and solids coexist in the solids channel.…”

Section: -Modelling Of Plasticizing In Barrier Screwsmentioning

confidence: 99%

“…Several studies have demonstrated that the performance of barrier screws is rather sensitive to their design features and to the operating conditions selected [11][12][13][14][15]. It is generally presumed that the start of the barrier matches the inception of melting, and that the melting rate is identical to the rate of change of the cross-channel areas for solids and melt in the downchannel direction.…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary Multi-Objective Optimization of Extrusion Barrier Screws: Data Mining and Decision Making

Gaspar‐Cunha¹,

Costa²,

Delbem³

et al. 2023

Preprint

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: Polymer single screw extrusion is a major industrial processing technique used to obtain plastics products. To assure high outputs, tight dimensional tolerances, and excellent product performance, extruder screws may show different design characteristics. Barrier screws, which contain a second flight in the compression zone, have become quite popular as they promote and stabilize polymer melting. Therefore, it is important to design efficiently extruder screws and decide whether a conventional screw will do the job efficiently, or a barrier-screw should be considered instead. This work uses multi-objective evolutionary algorithms to design conventional and barrier screws (Maillefer screws will be studied) with optimized geometry. Processing of two polymers, Low Density Polyethylene and Polypropylene, is analyzed. A methodology based on the use of Artificial Intelligence (AI) techniques, namely data mining, decision making and evolutionary algorithms, is presented and utilized to obtain results with practical significance, based on relevant performance measures (objectives) used in the optimization. For the various case studies selected, Maillefer screws were generally advantageous for processing LDPE, while for PP the use of both types of screws would be feasible.

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Section: Introductionmentioning

confidence: 74%

Section: -Modelling Of Plasticizing In Barrier Screwsmentioning

confidence: 99%