| 摘要 |
A short-dwell coater coats a web positioned against a backing roll with coating mix. The coater comprises a front lip as a part of the coater support structure, a feeder device adjacent the front lip for feeding the coating mix onto the paper web, a mouth piece (4, 5) forming an extension of the feeder device and forming an application zone (8) against the web (9), and a doctor blade mounted rearward of the application zone with respect to the forward machine direction. This blade doctoring the excess coating mix away from the web. The coater further comprises an intermediate lip (6) positioned between the feeder device and the doctor blade in conjunction with the front lip and forming together with web a space capable of acting as the application zone. This application zone will have a wedge-shaped cross-section tapering in the forward machine direction so that a side of the intermediate lip facing the doctor blade forms an obtuse angle with the exiting web in order to prevent the reflow of the doctored coating mix to the application. This coater can be used at high web speed and will prevent blending of the coating mix and doctored coating mix. |
