Large, thin, plate‐shaped parts usually are strengthened with structural ribs. Ribs also serve as gas channels with gas‐assisted technology. The layout and geometry of these gas‐channel ribs are critical to the gas‐assisted injection molding (GAIM) process. In this study, the effects of rib geometry, including aspect ratio and fillet geometry, on the GAIM process are investigated. Experimental results indicate that increasing the rib width widens the allowable operation range and thus improves the moldability. Adding fillets to the rib corner significantly enhances the moldability. Adding fillets also reduces the loss of rigidity due to void formation in the rib. A curved fillet improves moldability and rigidity more than one that is straight.

Densities and viscosities of binary liquid mixtures of butyl acrylate + 1-butanol and ethyl laurate + 1-butanol are presented over the complete concentration range at (293.15, 303.15, and 313.15) K. The densities were measured using a vibrating tube digital densimeter, and the viscosities were measured by a capillary viscometer. Excess molar volumes and viscosity deviations were then calculated at various temperatures. All excess molar volumes are positive, indicating the effect of disruption of the hydrogen bonding between 1-butanol molecules. Excess molar volumes and viscosity deviations were correlated by the Redlich−Kister type equations. Optimally fitted parameters are presented, and the correlation results are in satisfactory agreement with the experimental data.