Scientific Approach to Mold Venting

Process & Design Technologies LLC offers full venting analysis of any injection mold through scientific calculations and information retrival by means of patent pending SureVent^TM checking device.

Vent Services

Vent size analysis

Process analysis

Vent placement

Venting is a major cause of imbalance filling of multi-cavity injection molds. Typically venting isn’t looked at closely because the perception venting is fine as along as there is no evidence of burning on the part. DO NOT under estimate the effects of back pressure in the cavity due to poor venting. The volume of air in the cavity needs to be displaced by the molten plastic. Like a syringe barrel, the plunger cannot be pushed forward if the end of the needle is too small or pinched off. The size of the needle orifice will determine how fast and how much pressure is required to push the plunger forward. If you have poor venting, it will require more pressure and time to displace the air.

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Poor or clogged vents can result added cavity heat and reduced cycle times