Wenzhou Yanheng Electric
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DEFECT TROUBLESHOOTING

Injection molding defect troubleshooting: sink, flash, weld line and trapped air

Use defect location, wall thickness, gate, venting and trial conditions for the first diagnosis.

Real plastic part porosity defect photo from Wikimedia Commons for defect troubleshooting
Real image source: Wikimedia Commons, “Porosities in a plastic part - garden chair”, by Thibdx, licensed CC BY 4.0. Used as a real defect reference image; it is not a customer product of this company.

Look at defect location first

Sink marks usually appear behind thick sections, bosses and ribs. Flash is often related to shutoff and mold locking. Weld lines and trapped air appear near flow meeting or last-fill areas.

Review part and mold before tuning

Sudden wall changes, thick ribs, small gates or poor venting are structural and mold issues. Tuning alone rarely removes the root cause.

Read the process window

Record melt temperature, mold temperature, speed, packing, cooling and photos. Without data, defect diagnosis becomes guesswork.

What to provide for discussion

Photos, material direction, wall thickness, gate location, defect position, trial parameters and quantity target make discussion more useful.

References: Protolabs Xometry Plastics Technology MoldMaking Technology
Content is rewritten and summarized from public sources; images are site-owned process illustrations.
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