Filter bag for industrial vacuum cleaners - has filter mat set in cut-out for easy mechanical mass production

摘要

The filter bag is made of air-impermeable paper but has a cut-out in which a filter mat of fleece material is mounted so as to engage over the cut-out. The filter bag is pref. filled with filter wadding whilst the paper is made of soda Kraft brown (paper). The resulting filter bag is vary stable and can absorb the high tensile forces which result from the suction force of the cleaner. The fleece filter mat can be fitted at a choice of spots allowing an accurate controlled guide of the air flow through the filter bag.