Randy Kerkstra continued his series on venting with this article that gets into the specifics of venting and addresses many of the challenges that molders face everyday.
One issue in particular that Randy discusses is perimeter venting. With the industry being split between who thinks it is beneficial and necessary and those who thinks it’s not.
Another issue discussed is the depth of the vents, and he does a great job of explaining his process for addressing vent depth issues.
You can read the entire article on Plastics Technology’s site here: http://www.ptonline.com/columns/tooling-venting-where-and-how-deep