BUILDING BOARD

摘要

A building board comprises a core (20') of gypsum which has penetrated a glass fibre sheet (24) embedded in one face and a coating of gypsum integral with the core material which has passed through the sheet. Apparatus for making such a board comprises: a lower forming surface and an upper forming surface defining a forming zone between them in which the plasterboard is formed; a supply of a first slurry to the lower forming surface; a supply of a second slurry to a glass fiber sheet to coat the upper surface of the sheet with the second slurry; means for passing the coated sheet into the forming space, whereby the lower surface of the sheet contacts the upper surface of the first slurry; and a vibrator roller for vibrating the upper forming surface so that the first slurry passes through the sheet into the second slurry. A method of making the board is also disclosed.