troduction
PS sheet is widely used in packaging, stationery and thermoforming industries. Many manufacturers encounter various quality issues during PS sheet extrusion. Small defects will affect finished product yield and bring extra material loss
Main Content
- Bubbles on sheet surface
Reason: Moisture in PS pellets, unstable feeding. Solution: Dry raw material before extrusion, check vacuum feeding system.
- Thickness unevenness
Reason: Die temperature imbalance, unstable melt pressure. Solution: Adjust die lip gap, keep steady extrusion speed; install melt pump if needed.
- Surface scratches and streaks
Reason: Dirty die lip, scratch on cooling roller. Solution: Clean die lip regularly, inspect and polish cooling rolls.
- Sheet warping & curling
Reason: Uneven cooling temperature on rollers. Solution: Balance temperature of upper and lower cooling rolls, control haul-off tension properly.
- Matte or foggy surface
Reason: Overheating of melt, poor plasticizing. Solution: Lower over-high barrel temperature, check screw wear condition.
Conclusion
Most PS sheet extrusion defects come from raw material pretreatment, temperature control and cooling system. Standardizing process parameters and regular equipment inspection can greatly reduce rejects. If you need a stable PS sheet extrusion line, welcome to contact us for support.
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