Extrusion & Post
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PVC Profile Dimension Fluctuation
Fenómeno del problema
Profile cross-section dimensions fluctuate big and small, wall thickness unstable, assembly and welding affected.
Análisis de la causa
Extrusion output fluctuation (unstable feeding), haul-off speed fluctuation, vacuum calibration instability; dimension is the result of synchronization of extrusion—haul-off—calibration, any link losing stability causes fluctuation.
Solución
①Stabilize feeding and extrusion output, eliminate output pulsation; ②Stabilize haul-off speed, synchronized with extrusion; ③Check whether the vacuum calibration system is normal; ④Calibrate calibration die dimensions and condition; ⑤Establish dimensional SPC monitoring to detect drift in time.
Conclusión clave
PVC profile dimension fluctuation = 'extrusion + haul-off + calibration' three-stability problem: first stabilize extrusion output, then synchronize haul-off, finally calibrate the calibration; the matching degree of the three determines dimensional accuracy.
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