Patent ID: 8002862
Filing Date: 2011-08-23
Classification: A47L,B31B,Y10S,Y10T

Abstract:
1. A filter bag for a vacuum cleaner, comprising: a substantially tubular bag made from a bag material having at least one non woven composite layer, the bag having a closed free end area and an at least partially closed area opposite the closed free end area; and a retaining plate, wherein edges of the bag are at least partially interconnected by a weld seam to form the at least partially closed area, and wherein a bottom of the bag is formed by folding plies of the bag material to lie one above another and at least partially interconnecting the plies of the bag material, wherein the plies are interconnected by welding, and wherein a pre-crease is introduced into the bag material substantially parallel to the weld seam in the bottom.