Patent ID: 9387419
Filing Date: 2016-07-12
CPC Classification: B01D,B26D,B26F

Claim Text:
1. A method for manufacturing a filter element for filtration of a fluid, the method comprising: providing at filter medium sheet having a plurality of flat filter medium layers stacked face to face upon each other forming a multilayer filter medium sheet; providing a cutting apparatus having providing a cutting device on the first or second side of the filter medium sheet, arranged downstream of the welding device, wherein the cutting device is mounted to move in unison with the welding device or anvil; aligning the welding device and anvil in the traverse direction to abut the welding device onto the anvil directly through the filter medium sheet, conveying the filter medium sheet in the conveying direction between the first and second holding device; welding layers of the filter medium sheet together along at least two spaced apart welding seams extending in the conveying direction, spacing of the at least two welding seams determined by the traverse spacing of the at least two anvil webs; cutting the filter medium sheet in the conveying direction between the at least two welding seams to separate the filter medium sheet into multiple welded filter medium sections each having at least one welding seam; and arranging or circumferentially closing at least one of the filter medium sections to produce the filter element.