EGAIM conditions A B C Gas delay time (sec) 0 0 0 1 3 Gas packing pressure (Bar) 50 10 50 50 90 Gas packing time (sec) 20 20 10 20 30
5 sec gas delay time (time that gas was applied after melt filling), 10 MPa gas pressure, and 15 sec gas packing time, and CIM molding conditions were 70 C mold temperature, 210[degrees]C melt temperature, and 0.
The proper sealing prevents any gas from leaking, and the gas packing pressure will not vary during the gas packing stage.
When the applied gas packing pressure is low, for example, 10 bar, the packing pressure difference between two mold sides increases to about 5 bar.
7e suggested that the severity of fingerings in water-molded parts increased with the water packing time, while the fingerings in gas-molded disks decreased with the gas packing
The generally applicable formulations for primary and secondary gas penetration into a viscous non-Newtonian melt during cavity filling and gas packing have been derived to gain understanding of the gas bubble distribution in a GAIM product.
At the gas packing stage, the secondary gas penetration is due to the polymer melt undergoing additional shrinkage resulting from cooling and solidification.
However, the density variation with temperature and pressure cannot be neglected in the gas packing stage.
Generally, the time increment during the cavity filling and gas packing stages used in this study was taken to be less than [10.
The effect of important processing parameters on the gas core thickness or RWT distribution and gas penetration length in moldings during the gas injection stage of cavity filling and the gas packing stage have been discussed.
3a, b and c, one can also find the effect of melt temperature on the measured and predicted gas penetration by the present model and by C-Mold at the end of gas packing.
4 shows the effect of shot size on the measured and predicted gas penetration by the present model and by C-Mold at the end of gas packing stage.