| 摘要 |
A coating process including providing a coating composition comprising finely divided photoconductive organic particles dispersed in a solution of a film forming binder, the composition having a predetermined substantially constant liquid yield stress value, flowing the composition along a feed channel, introducing the composition into an elongated manifold cavity comprising a least a first progressively narrowing channel extending away from the feed channel, flowing the coating composition along at least the first progressively narrowing channel, flowing the coating composition out of the manifold cavity into an extrusion passageway extending away from at least the first progressively narrowing channel, shaping the coating composition into a thin ribbon shaped stream in the extrusion passageway, depositing the ribbon shaped stream on a substrate to form a coating, and maintaining an applied shear stress to the composition that is greater than the yield shear stress value of the coating composition while flowing the composition through the at least first progressively narrowing channel and extrusion passageway.
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