Elastic flow-front fingering instability in flowing polymer solutions

Kabanemi, Kalonji K.; Hétu, J.‐F.; Sammoun, Samira H.

doi:10.1007/s00397-005-0027-5

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…agglomerations) that locally change the viscosity [20]. The effect has also been reported with unfilled shear thinning viscoelastic fluids [21]. Here, the flow front should get smoother if the filling velocity is lowered in such a way that the polymer is always in the Newtonian range.…”

Section: Discussion: Comparison Between Experiments and Simulation Ofmentioning

confidence: 82%

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Simulation and experimental analysis of large area substrate overmolding with epoxy molding compounds

Schreier-Alt

Rehme²,

Ansorge

et al. 2011

Microelectronics Reliability

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Section: Discussion: Comparison Between Experiments and Simulation Ofmentioning

confidence: 82%

“…when spreading symmetrically from a pin gate. The occurrence of this effect seems to be linked to shear stresses perpendicular to the flow direction [21]. If a pin gate is used, the velocity of the melt decreases monotonously with increasing distance from the gate.…”

Section: Discussion: Comparison Between Experiments and Simulation Ofmentioning

confidence: 98%

Simulation and experimental analysis of large area substrate overmolding with epoxy molding compounds

Schreier-Alt

Rehme²,

Ansorge

et al. 2011

Microelectronics Reliability

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“…The observed flow instabilities [38,92] are argued to be related to the overall elasticity augmentation in polymer melt associated with an El as high as 10 6 , which is 10 000 times larger than those found in elastic instability experiments with polymer solutions [87,93,94] or in extrusion processes with polymer melts [95].…”

Section: Elastic Effectsmentioning

confidence: 76%

Microinjection molding of microsystem components: new aspects in improving performance

Yang

Yin

Cheng

2013

J. Micromech. Microeng.

101

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Microinjection molding (μIM) is considered to be one of the most flexible, reliable and cost effective manufacturing routes to form plastic micro-components for microsystems. The molding machine, mold tool fabrication, material selection and process controlling in this specific field have been greatly developed over the past decades. This review aims to present the new trends towards improving micro-component performance by reviewing the latest developments in this area and by considering potential directions. The key concerns in product and mold designing, essential factors in simulation, and micro-morphology and resultant properties are evaluated and discussed. In addition, the applications, variant processes and outlook for μIM are presented. Throughout this review, decisive considerations in seeking improved performance for microsystem components are highlighted.

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“…Departure from homogeneity and continuity of melt properties can incur an eccentric flow in the microregime. Several studies with dilute solutions [15][16][17] suggest that there can be important phenomena in the micro-flow of polymer melt. Moreover, flow anomalies in micro-molding should be analyzed and understood in depth, since they are directly related to mass-production of micro-parts.…”

Section: Introductionmentioning

confidence: 99%

Flow instability of semicrystalline polymer melt during micro-injection molding

Kim¹,

Kim²,

Jung³

et al. 2014

J. Micromech. Microeng.

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This work investigates the flow instability of thermoplastic polymer melt that occurs on the flow front when it enters micro-cavities. On the flow front, it was observed that small balls are formed and coalesce with each other, creating many micro-weld lines. The experimental results in this work showed occurrence of this phenomenon for polypropylene and polyamide but not for high density poly(ethylene), poly(methylmethacrylate) or acrylonitrile butadiene styrene. It was found that onset of this instability is related to the spherulite size. The effects of temperature and geometry have been scrutinized. As a conclusion, the ratio of spherulite size and channel width has been proposed as a dimensionless number related to this instability.

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Elastic flow-front fingering instability in flowing polymer solutions

Cited by 4 publications

References 24 publications

Simulation and experimental analysis of large area substrate overmolding with epoxy molding compounds

Simulation and experimental analysis of large area substrate overmolding with epoxy molding compounds

Microinjection molding of microsystem components: new aspects in improving performance

Flow instability of semicrystalline polymer melt during micro-injection molding

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