How Optimized Mold Venting Improves Part Quality and Reduces Defects

In injection molding, what you can’t see can often cause the biggest problems. Trapped air and gas inside the mold cavity may lead to short shots, burn marks, voids, or surface blemishes. That’s why mold venting design is critical to achieving consistent, high-quality plastic parts.

At Dongxinda Mould Technology Co., Ltd., we engineer venting systems with precision and foresight, using simulation and real-world molding data to eliminate air traps and gas buildup—before they impact your production.

Common Issues Caused by Poor Venting:

• Incomplete filling or short shots

• Burn marks on the surface of parts

• Voids or bubbles in thick wall sections

• Excess injection pressure and longer cycle times

Dongxinda’s Mold Venting Solutions:

• Micromachined Vent Grooves on parting surfaces

• Vacuum Venting Systems for low-pressure molding

• Venting Inserts for complex or deep-cavity molds

• Simulation-Based Vent Placement using Moldflow

With properly designed venting, clients see improvements in both part cosmetics and dimensional accuracy. We also ensure vent maintenance is easy by designing access points and cleaning procedures directly into the tool.

FAQs:

• How deep are vent grooves typically?
  Usually 0.01–0.03 mm deep, depending on material viscosity.

• Can vents affect parting line quality?
  Not if designed properly—they should be invisible on the finished part.

• Do you simulate venting during mold design?
  Yes, we always include venting analysis in the Moldflow stage.