Importance

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Abstract

A disposable vacuum cleaner filter bag is constructed of layers which include a filtration grade meltblown fleece layer having a basis weight of about 10-50 g/m.sup.2 and air permeability of about 100-1000 L/(m.sup.2.times.s) and a coarse filter layer in which the coarse filter layer is placed upstream of the filtration grade meltblown fleece layer. The coarse filter layer can include either wet-laid high dust capacity paper, dry-laid high dust capacity paper, high bulk meltblown nonwoven, Spunblown (Modular) nonwoven or microdenier spunbond nonwoven. Juxtaposition of the layers causes the coarse filter layer to capture large dirt particles and permits the filtration grade meltblown fleece layer to capture much of the remaining dust particles. The novel bag exhibits high air permeability and low pressure drop at high dust loading. A method of filtering gas through such a filter is also disclosed.

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First Claim