摘要 |
A method and apparatus for coating both faces of a moving web, such as a paper web, in which the web is fed longitudinally at a speed in excess of 300 metres per minute, between a rotating support roller and a blade, the blade having a bevel at the point of contact with the web. Costing material is fed into the nip between the roller and the web to coat the paper web on both faces. The angle which the blade forms with respect to the web is chosen to be not greater than 20.degree. and the bevel width, as measured in the direction of movement of the web, is at most 0.15 centimetres. Preferably the blade is urged against the web with a force not exceeding 0.20 kgf per centimetre width of web. |