Filter bag for use in vacuum cleaner, has outer bag and inner bag, where air permeability of wall of inner bag is greater than that of wall of outer bag and free interior is formed between outer and inner bags

摘要

The bag (1) has outer and inner bags (2, 3), where a free interior is formed between the outer and inner bags. An outer bag wall is made from air-permeable filter material and an inner bag wall is made from grid material and has outlet openings which are designed as continuous grid pattern-openings of the grid material. The openings are distributedly arranged over the inner bag wall such that air flows from the inner bag interior into the outer bag free interior exclusively or predominantly through the openings. The air permeability of inner bag wall is greater than that of the outer bag wall.