(57) A drum having a carrying side wall of a latticed structure, to be used as a forming
or suction drum in the machines for the manufacture of paper, paper-board, asbestos
cement and the like, and which consists of two heads (2 or 2a) between which is mounted
a peripherical, cylindrical carrying wall (1) constituted of two pluralities of small
bars (1a, 1b) crossing to each other and which extend helically with the same pitch,
but right-hand and left-hand respectively and equally spaced apart from each other
so as to form a reticular structure with passages quadrangular in cross section, the
bars (1a, 1b) being restrained with each other in their cross point. The heads (2
or 2a) are provided with axial orifices through which washing pipes (8, 8a; 8A) and
optionally suction pipes can freely pass through the revolving drum.
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