Extrusion & Post
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PC Extruded Sheet Uneven Thickness
Problem Phenomenon
PC extruded sheet/plate has large transverse thickness deviation, optical plates are unqualified.
Cause Analysis
Improper die lip gap adjustment, uneven melt temperature, and haul-off speed fluctuations all cause thickness deviation; uneven die head thermal expansion and local material accumulation also make the discharge uneven.
Solution
①Calibrate the die lip bolts and use closed-loop adjustment with a thickness gauge; ②Stabilize the melt temperature and the temperatures of each die head zone; ③Stabilize the haul-off speed, synchronized with extrusion; ④Clean the die head regularly; ⑤Check heating uniformity.
Key Takeaway
PC sheet thickness relies on the three-in-one stability of 'die lip + temperature control + haul-off': optical sheets need thickness closed-loop; use the thickness curve to locate the problematic die lip section for transverse deviation and adjust it targetedly.
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