In the rectifier roll headbox, the wake effect of slice roll generates fiber orientation streak, which results in poorly perforating and leads to paper flaw during coating and calendaring.

• 匀浆辊流浆箱的匀浆辊（闸辊）的波迹效应产生的纤维定向条纹，导致整流效果不良，最终引起涂布、压光中的纸病，影响印刷质量。