| 摘要 |
To provide perforations on the webs (4) of spacer frames (1) formed from hollow sections (2), the said webs facing the pane interspace (5) of an insulated glazing unit, the region of perforation is first of all deep drawn in the direction of the inside of the section (2) and a hole is then punched in the deepest point of the deformation (7a) thereby obtained. This deep-drawn region is then rolled in such a way that the depth of this deep drawing is somewhat reduced and the perforation (6a) is thereby pressed to in a dust-tight manner. This can be achieved in a simple manner with a roll (9) having a circumferential groove (10), giving rise overall to a spacer frame (1) which has pressed-to openings (6) at the deepest - or highest - point of knob-shaped depressions (7) on its webs (4) facing the pane interspace (5), with the result that pulverised or crushed desiccant dust is prevented from falling out not only by the reduction in the cross-section of the openings (6) when pressed to, but also by their raised position relative to the upper horizontal web (4) of the hollow section (2). …<IMAGE>… |
