Vacuum cleaner bag for collecting e.g. dust, has aperture for retaining particles inside bag and comprising walls that are assembled from non-woven material layers, and narrow seams arranged at predetermined distance from aperture edge

摘要

The bag (1) has a suction hole aperture (2) for retaining particles inside the bag, and comprising walls that are assembled from layers from a loose non-woven material. Narrow seams (6, 6') are arranged at a predetermined distance (a) from an edge (4) of the aperture. The narrow seams are produced by an ultrasonic welding and/or bonding and/or fusion. Densities of the outer layers are larger than that of the layer lying between the outer layers. An air-impermeable surface element is fastened by sticking and/or ultrasonic sealing. Independent claims are also included for the following: (1) a method for forming an aperture in a vacuum cleaner bag (2) a device for inputting a gas particle flow inside a vacuum cleaner bag.