Three-dimensional numerical and experimental investigations on polymer rheology in meso-scale injection molding

Khor, C. Y.; Ariff, Zulkifli Mohamad; Ani, F. Che; Mujeebu, M. Abdul; Abdullah, Moha Asri; Abdullah, M. Z.; Joseph, M. A.

doi:10.1016/j.icheatmasstransfer.2009.08.011

Cited by 53 publications

(35 citation statements)

References 29 publications

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“…Generally, specimens with a structure of co‐continuous microlayers are fabricated by injection molding. The melt complexly flows during injection molding, which is critical in determining morphology . The molten polymer flows from the middle of the cavity towards the wall and is subjected to extensional deformation.…”

Section: Introductionmentioning

confidence: 99%

Effect of melt flow on morphology and linear thermal expansion of injection-molded ethylene-propylene-diene terpolymer/isotactic polypropylene blends

et al. 2015

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An ethylene–propylene–diene terpolymer/isotactic polypropylene blend with a structure of co‐continuous microlayers was fabricated by injection molding and was then investigated. The blend exhibited an extremely low coefficient of linear thermal expansion (CLTE) in the directions of the length and the width. As the thickness of the oriented portion increased, the CLTE was further reduced. The morphology of the co‐continuous microlayers and the thermal expansion behavior varied with the sampling positions on the injection‐molded sheets. To study the relationship between the morphology and the melt flow, the melt flow behavior during injection molding was simulated using Moldflow. Orientation of the microlayers was determined using shear flow. When the shear rate increased, the orientation state increased and the CLTE decreased. © 2015 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Effect of melt flow on morphology and linear thermal expansion of injection-molded ethylene-propylene-diene terpolymer/isotactic polypropylene blends

et al. 2015

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“…Undeniably, it is crucial to determine the rheological data in order to observe the behavior of polymeric materials. Recently, Khor et al experimentally confirmed that by incorporating the necessary rheological data, the simulations performed by using FLUENT and experimental results are in good agreement. It is noted that their study focused on acrylonitrile‐butadiene‐styrene plastic without any addition of filler.…”

Section: Introductionmentioning

confidence: 76%

Viscosity analysis of polypropylene-kaolin composites measured using single-screw extruder

Rahim

Ariff

Ariffin

et al. 2014

J Vinyl Addit Technol

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Deviations between data for the apparent and true viscosity measurement are commonly observed in the rheological studies of thermoplastics. To validate the significance on the usage of these data on the processing side, filling analysis for the apparent viscosity and true viscosity of polypropylene‐kaolin (PP‐kaolin) composites was conducted by using CadMold® software on the dumbbell Computer Aided Design model for comparative purposes. The raw apparent viscosity data were generated from a single‐screw extruder by using different sets of die geometries. Bagley and Rabinowitsch corrections were implemented to get a corrected set of true viscosity measurements. It was found that the true viscosity curves are lower compared with the apparent viscosity curves of PP‐kaolin. By constructing the corresponding data from PP‐kaolin composite rheological results, it was discovered that the high viscosity of the apparent viscosity melt data has shown a large variation in the mold distributions filling temperature, reduces the total pressure loss and melt shear stress, and increases the melt velocity during mold filling. Although the corrections were made on the calculated results, however, the significance is relatively small and it does not prove the changes in the overall physical property of the composite. Therefore, correcting the data by using the Bagley and Rabinowitsch corrections is not necessary in mold‐filling analysis. J. VINYL ADDIT. TECHNOL., 20:275–283, 2014. © 2014 Society of Plastics Engineers

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“…Therefore, the current simulation yields realistic predictions and provides reliable solutions for fluid flow problems. In addition, the capability of FLUENT was proven to handle diverse problems excellently, such as the encapsulation of TQFP [4] and S-CSP [10], injection-molding process [21], and pressurized [22] and conventional [23] underfill processes.…”

Section: Model Validationmentioning

confidence: 99%

Effect of stacking chips and inlet positions on void formation in the encapsulation of 3D stacked flip-chip package

Khor

Abdullah

Ariff

et al. 2012

International Communications in Heat and Mass Transfer

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Three-dimensional numerical and experimental investigations on polymer rheology in meso-scale injection molding

Cited by 53 publications

References 29 publications

Effect of melt flow on morphology and linear thermal expansion of injection-molded ethylene-propylene-diene terpolymer/isotactic polypropylene blends

Effect of melt flow on morphology and linear thermal expansion of injection-molded ethylene-propylene-diene terpolymer/isotactic polypropylene blends

Viscosity analysis of polypropylene-kaolin composites measured using single-screw extruder

Effect of stacking chips and inlet positions on void formation in the encapsulation of 3D stacked flip-chip package

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