dreneringsanordning with vidheftande treads and still for its framstellning

摘要

A drainage device adapted to be mounted on a papermaking machine and positioned to support the moving web and to engage the undersurface of the web as it passes thereover to extract fluid downwardly from the web. The drainage device includes a main body portion and a multiplicity of wear resistant wafers bonded thereto with the upper surface of the wafers providing a bearing surface for the moving web as it passes thereover and the main body portion and the wafers having substantially the same coefficient of thermal expansion.