| 摘要 |
The surface of the roller, to give a roughened surface to fibre board materials, is formed by a number of recesses, each defined by side walls of the same height sepg. them from their neighbouring recesses. The upper edges of the dividing walls lie flush with the cylindrical mantle surface of the roller. ADVANTAGE - The roller surface gives the required board surface structure as the fibre material passes round the roller, without forming loops clinging round the roller surface.
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