Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Bubbles (also known as voids or air pockets) are common defects in injection-molded plastic parts. They appear as small gas-filled cavities on the surface or internally within the material, which can compromise the part's strength, appearance, and functionality. These defects typically form when gases are trapped during the molding process and fail to escape before the plastic solidifies.

Primary Causes of Bubbles

Based on industry insights, bubbles arise from a combination of material, machine, mold, and process-related factors. Here's a breakdown of the most common causes:

Prevention Tips

To minimize bubbles:Dry materials thoroughly (e.g., using a dehumidifying dryer at recommended temperatures).

Optimize process settings: Reduce injection speed, increase back pressure, and fine-tune temperatures.

Improve mold venting: Add or enlarge vents in high-flow areas.

Use simulation software to predict and adjust for flow issues before production.