| 摘要 |
The invention relates to a dust filter bag having a highly porous backing material ply and to a method for producing the dust filter bag The dust filter bag comprises at least one filter material ply and at least one backing material ply, the backing material ply featuring an air permeability of at least 900 l/m2xs, a burst strength of at least 70 kPa, a rupture strength longitudinally better than 10 N and transversely better than 3 N, a flexural rigidity longitudinally better than 0.5 cN cm2 and transversely better than 0.25 cN cm2, a basis weight of 30-80 g/m2 and a droplet sink-in time of less than 10 minimum. The dust filter bag can be produced by the following steps: mixing fibers including cellulose fibers and fusible fibers into a homogenous fiber mix, processing the fiber mix into a fiber web by wet laying, drying the fiber web, curing the dried fiber web by thermofusion into a backing material ply, processing the backing material ply with a filter material ply into a raw bag, finishing the raw bag into a dust filter bag.
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