Today's KNOWLEDGE Share
🔹 What Are Flow Lines in Injection Molding — and Why Should You Care?
Flow lines are one of the most common (and frustrating) surface defects in plastic parts.
They appear as:
➖ Wavy streaks
➖ Discoloration
➖ Directional lines following the melt flow
These cosmetic issues don’t always affect function—but for customer-facing parts, they can ruin product aesthetics and perceived quality.
🔍 What causes flow lines?
🌡️ Material cooling too quickly in thin sections
🧊 Inconsistent mold temperatures
🌀 Flow hesitation around corners, holes, or sudden thickness changes
🐢 Injection speed too low or poor gate design
💡 How to reduce flow lines
✅ Optimize gate size & position
✅ Increase injection speed & pressure
✅ Improve mold temperature control
✅ Design smooth, even wall thickness transitions
source : SCSplastic
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