Simulation of injection-compression mold-filling process

Chen, S.C.; Chen, Y.C.; Cheng, Nien-Tien; Huang, Ming‐Shyan

doi:10.1016/s0735-1933(98)00082-7

Cited by 60 publications

(34 citation statements)

References 2 publications

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“…A detailed molding-pressure study concerning the influence of processing parameters on the ICM pressure was described elsewhere. 18 Figures 6 and 7 show the pressure distribution of the entire CIM and ICM processes correspondingly. During the postfilling stage of the CIM process, the holding pressure away from gate decreases smoothly as the postfilling stage starts.…”

Section: Simulated Results and Discussionmentioning

confidence: 99%

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Simulation of injection-compression-molding process. II. Influence of process characteristics on part shrinkage

Chen

Peng

2000

J. Appl. Polym. Sci.

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A numerical algorithm is developed to simulate the injection-compression molding (ICM) process. A Hele-Shaw fluid-flow model combined with a modified control-volume/finite-element method is implemented to predict the melt-front advancement and the distributions of pressure, temperature, and flow velocity dynamically during the injection melt filling, compression melt filling, and postfilling stages of the entire process. Part volumetric shrinkage was then investigated by tracing the thermal-mechanical history of the polymer melt via a path display in the pressure-volumetemperature (PVT) diagram during the entire process. Influence of the process parameters including compression speed, switch time from injection to compression, compression stroke, and part thickness on part shrinkage were understood through simulations of a disk part. The simulated results were also compared with those required by conventional injection molding (CIM). It was found that ICM not only shows a significant effect on reducing part shrinkage but also provides much more uniform shrinkage within the whole part as compared with CIM. Although using a higher switch time, lower compression speed, and higher compression stroke may result in a lower molding pressure, however, they do not show an apparent effect on part shrinkage once the compression pressure is the same in the compression-holding stage. However, using a lower switch time, higher compression speed, and lower compression stroke under the same compression pressure in the postfilling stage will result in an improvement in shrinkage reduction due to the melt-temperature effect introduced in the end of the filling stage.

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Section: Simulated Results and Discussionmentioning

confidence: 99%

“…(22) is automatically satisfied when applying eq. (18). To verify the numerical convergence in every step of the analysis, the mass conservation at the melt entrance expressed by eq.…”

Section: Numerical Algorithm Cv/fem Methodsmentioning

confidence: 99%

Simulation of injection-compression-molding process. II. Influence of process characteristics on part shrinkage

Chen

Peng

2000

J. Appl. Polym. Sci.

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“…The viscosity behavior of the EMC is described by the CastroMacosko model [3,4,17,19] to predict the relationship between the viscosity and degree of polymerization given by…”

Section: Governing Equationsmentioning

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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“…The uniform distribution of pressure applied in compression stage another merit in injection/compression molding. It has been shown to improve the dimension stability, transcription characteristics (Chen et al, 1998;Lee et al, 2002;Min et al, 2006;Weng et al, 2009). …”

Section: Injection/compression Moldingmentioning

confidence: 99%

An experimental study on the effects of injection-molding types for the birefringence distribution in polycarbonate discs

Min

Yoon

2011

Korea-Aust. Rheol. J.

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Even though injection molding technology has been developed for many years, it is still needed to study the effect of processing conditions on the final properties of injection-molded parts for producing precision products in optical field. The optical anisotropy, i.e., birefringence, is a significant factor which affects the function of many optical components. In the present study, we have focused on the effects of packing and compression processes on the birefringence structure remaining in the disc by examining the gap-wise distribution of birefringence and extinction angle. As a result, two extra birefringence and extinction peaks near the center in thickness direction showed the effect of packing pressure, which came from the extra flow during packing stage. Furthermore, more uniform birefringence distribution was found in injection/compression case than in conventional injection-molded case. Depending on the process condition, even the reversal flow was found from the distribution of extinction angle in injection/compression case. Finally, graphical representation technique of optical refractive indicatrix was suggested to show the difference of final birefringence structure for different process types.

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Simulation of injection-compression mold-filling process

Cited by 60 publications

References 2 publications

Simulation of injection-compression-molding process. II. Influence of process characteristics on part shrinkage

Simulation of injection-compression-molding process. II. Influence of process characteristics on part shrinkage

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

An experimental study on the effects of injection-molding types for the birefringence distribution in polycarbonate discs

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