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This installment delves into more detail on some variables of design and fitting/timing of the lifters, which can cause issues or failures during molding.

Attention to design of cooling, ejection, and slides can save downtime and maintenance headaches.

Principles to follow in venting bosses, ribs, pins, cores, slides, and lifters.

After last month’s introduction to the subject, let’s get into the details on vent depths, land lengths, and the alternatives to perimeter venting.

Venting is a prime culprit for molding problems, partly because toolmakers and process techs have different ideas of what’s needed.

It’s a subject not widely understood by molders and it affects more than just part appearance.

It depends on the materials and additives you use, and the kinds of mold detail, but adequate venting, not overheating the material, and mold coatings are your best defenses.

A well-maintained injection molding machine will improve uptime, decrease cycle time and extend the life of the machine.

To design a mold for the widest processing window and the fewest problems, start by considering the conditions imposed by the material being run.

Parting-line maintenance, mold spotting, and machine conditions can all contribute to flash.