Vacuum cleaner bag and improved vacuum cleaner bag

摘要

A filter for removing particles entrained in a gas comprising a multipurpose filtration capacity layer positioned upstream in the direction of air flow of a second filtration layer, the second filtration layer being selected from among a) a wet-laid or a dry-laid filter having a base weight of about 30-100g/m2 and air permeability of about 100-3000 l(m2x2) and b) thermally bonded non-woven having a basis weight of 10-100 g/m2 and a permeability of about 100-3000l/(m2 x s). There are also claims for a method utilising this filter.