Method of applying a film of coating material to a paper web including
successive doctoring steps
    84.
    发明授权
    Method of applying a film of coating material to a paper web including successive doctoring steps 失效
    将包覆材料膜涂覆在纸幅上的方法,包括连续的刮涂步骤

    公开(公告)号:US5702765A

    公开(公告)日:1997-12-30

    申请号:US479286

    申请日:1995-06-07

    Abstract: A method and apparatus for applying coating liquid to a web of paper traveling over a web supporting surface at speeds of 3,000 or more feet per minute to produce a coated web free of streaking and other imperfections includes the steps and structural elements for distributing coating liquid onto the supported web through a limited application zone within a short dwell time of the liquid on the web, the web moving through the application zone at a speed that is sufficiently high to create turbulence in the coating liquid being applied to the web, doctoring the coating liquid on the web by biasing a primary doctor against the coated web at the rear edge of the application zone so as to form a layer of coating liquid on the web as the web leaves the application zone, the turbulence in the coating liquid causing machine direction streaks in the layer of the coating liquid as the web leaves the application zone; and, at a location downstream and isolated from the application zone, performing a successive doctoring of excess coating liquid on the supported web by biasing a final doctor blade against the coated web to remove excess coating from the web and to level and smooth the coating retained on the web to a final wet film thickness and smoothness.

    Abstract translation: 一种用于将涂布液施加到以每分钟3,000或更多英尺的速度在纸幅支撑表面上行进的纸幅的纸张的方法和装置,以产生没有条纹和其他缺陷的涂布纸,包括用于将涂布液分配到 通过在纸幅上的液体的短停留时间内的受限制的应用区域,纸幅以足够高的速度移动通过施加区域,以在施加到幅材上的涂布液中产生湍流,对涂层进行刮涂 通过在施加区域的后边缘处将初级刮刀偏压在涂布的纸幅上,以在纸幅离开涂布区域时在纸幅上形成涂布液层,涂布液体中的湍流引起机器方向 当纸幅离开涂布区域时涂布液层的条纹; 并且在下游并与施加区隔离的位置处,通过将最终的刮刀偏置在涂布的幅材上以使得从幅材上除去多余的涂层并使保留的涂层水平和平滑 在网上达到最终的湿膜厚度和平滑度。

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