| 摘要 |
METHOD AT THE FABRICATION OF FILTERS WITH DEEP FOLDS FOR THE CONNECTING SIDES OF THE FILTER FOLDS WITH EACH OTHER TO PREVENT BLOW UP AND ENSURE INTENDED SHAPE, COMPRISING THE WELDING OF AN INTERMEDIATE DISTANCE ELEMENT SHEET (16) TO THE FILTER MATERIAL (17) ON EACH SIDES. THE DISTANCE ELEMENT SHEET INCLUDES BRIDGES AND OR CONNECTIONS BETWEEN PARTS WELDED TO THE DIFFERENT FILTER SIDES, THE BRIDGES BEING EXTENDABLE, FORINSTANCE CURVED OR ANGLED PARTS.IN PARTICULAR THESE BRIDGES MAY BE EXTENDABLE TO DIFFERENT LENGTHS AT DIFFERENT LOCATIONS IN THE FILTER IN ORDER TO ACHIEVE FOR INSTANCE A TRIANGUULAR CROSS SECTION.
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