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Dust filter bag producing method, involves raising edge sections of upper web by edge zones of fold limbs resting upon on lower web before and during longitudinal welding, where upper web and lower web are made of weldable material
Dust filter bag producing method, involves raising edge sections of upper web by edge zones of fold limbs resting upon on lower web before and during longitudinal welding, where upper web and lower web are made of weldable material
The method involves forming fold limbs for side gussets (3) with a leg length transverse to a longitudinal direction in an upper web such that a breadth of the upper web between the outside folding edges and between the outside longitudinal folds of the fold limbs (4) adjacent to the lower web is equally to a width lower web. Edge sections of the upper web are raised by edge zones of the fold limbs resting upon on the lower web before and during a longitudinal welding. The outside folding edges are present at the upper web. The upper web and the lower web are made of a weldable material. An independent claim is also included for a dust filter bag with a rectangular or square basic form and with walls.
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