| 摘要 |
A lightweight vacuum drum (10) for use in labeling and similar applications having components constructed of castable, non-metal materials. The vacuum drum (10) includes a main drum core (14) having a flexible cylindrical wall casting (20), investment casting or extrusion of polymeric material coupled to a polymeric bottom ring (22). A support flange (16) is formed from either aluminum or a polymeric material and is fastened to the cylindrical wall (20) and bottom ring (22) castings. The cylindrical wall (20) includes air passages in fluid communication with radially extending vacuum ports (28) formed in the outer surface of the side wall to provide a vacuum conduit to the outersurface of the cylindrical wall (20). |
