Amerimold 2019 Update: What You Should Know about Getting Venting Right



Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Every molder experiences problems with gas and air entrapment. Venting is a process to remove trapped air and nonaqueous volatiles (NAV) from the closed mold. NAVs come from the fillers and additives that are present in the resins we use today. They give off larger volumes of gases, and when compressed, can etch the surface of the mold cores causing parts to stick. Without venting, the trapped air and NAVs will not let plastic flow to and fill the cavity, and short shots are the result. When vents are not working properly, it is because there are not enough of them or they are not at the correct depth. There are many considerations for venting, including where to vent, how wide to make them, how many to have, land width of the primary and secondary vents and of course how deep on the primary. This presentation will review several ways to get your venting right, including guidelines for designing and machining vents to optimize venting capacity, proper vent amount, location, width and depth, using a vacuum/blowback venting system and modifying the tool for vacuum venting, using and designing with self-venting mold material, and installing the most efficient mold components, such as vacuum vent blocks and venting valves.

- Cyndi Kustush, Senior Editor, MoldMaking Technolgy

- Steve Shannon, Director, Estee Lauder
- David Plocinski, General Manager, Tri-Par Mold
- Tim Lankisch, Director of Engineering, CAE Services:


Register for Amerimold to gain free access to this panel discussion and others in the Tech Talk Theater program, presented by MoldMaking Technnology.



  • Conversational CNC Helps Moldmaker Bridge Skills Gap

    What can a company do when it has a healthy flow of work running through its facility but a lack of skilled workers to complete it all in an efficient, cost-effective manner? This moldmaker found the solution in two Hurco VMX 42i CNC mills with conversational programming capability.

  • Cutting-Edge Conformal Cooling

    Recently, I reconnected with an industry colleague who will bring some international expertise to the states this May to discuss one of the hot topics in moldmaking today: conformal cooling. And, this will be followed up at Amerimold in June.

  • 2018 Leadtime Leader Award Winner: Maximum Mold Group

    Strategic acquisitions and diversified capabilities combined with a can-do, inclusive culture take this mold manufacturer to new heights.