When filling a mold with high veloc

When filling a mold with high velocity the gases generated during processing will have less chance to escape through the vents of the mold, which results in faster fill velocities requiring more venting. If fill time seems to contribute to the buildup issues, first try to add additional venting to the mold rather than immediately slow down the fill velocity. Slower fill velocities result in longer cycle times and make the part more expensive to produce. Way too often there are cases where someone slows down fill velocities to eliminate a defect caused by lack of venting (see Section 19.3.2 for more on venting).