Vacuum cleaner filter bag with film in the region of the holding plate

Abstract

The invention relates to a vacuum cleaner filter bag comprising a bag wall and a retaining plate ( 13 ) which is connected to the bag wall, wherein the bag wall comprises a film region in which a plastic film is arranged, wherein the film region comprises a first sub-region in which the bag wall is formed solely by the plastic film or in which the plastic film forms the outermost layer of the bag wall, wherein the film region comprises a second sub-region in which the plastic film is overlapped by a nonwoven fabric element ( 3 ), wherein the retaining plate ( 13 ) is connected, in particular welded, to the plastic film and the nonwoven fabric element ( 3 ), and wherein the nonwoven fabric element ( 3 ) has at least one part ( 11, 12 ) which is connected to the bag wall part surrounding the film region.

1 . A vacuum cleaner filter bag comprising a bag wall and a retaining plate which is connected to the bag wall, wherein the bag wall comprises a film region in which a plastic film is arranged,
 wherein the film region comprises a first sub-region
 in which the bag wall is formed solely by the plastic film or 
 in which the plastic film forms an outermost layer of the bag wall, 
   wherein the film region comprises a second sub-region in which the plastic film is overlapped by a nonwoven fabric element,   wherein the retaining plate is connected to the plastic film and the nonwoven fabric element, and   wherein the nonwoven fabric element has at least one part which is connected to the bag wall part surrounding the film region.   
     
     
         2 . The vacuum cleaner filter bag according to  claim 1 , wherein the plastic film is transparent or non-transparent. 
     
     
         3 . The vacuum cleaner filter bag according to  claim 1 , wherein the nonwoven fabric element comprises a through-hole which is arranged concentrically with respect to a through-hole in the plastic film and a through-hole in the retaining plate. 
     
     
         4 . The vacuum cleaner filter bag according to  claim 3 , wherein the nonwoven fabric element comprises an annular region that surrounds the through-hole and is connected to the bag wall part surrounding the film region via at least one connection piece, and wherein the retaining plate is connected to the nonwoven fabric element in the annular region. 
     
     
         5 . The vacuum cleaner filter bag according to  claim 4 , wherein at least two connection pieces connect the annular region to the bag wall part surrounding the film region on opposing sides of the film region. 
     
     
         6 . A method for producing a vacuum cleaner filter bag, the method comprising:
 punching at least one through-opening into a sheet of nonwoven fabric such that a region free of nonwoven fabric is formed in the sheet of nonwoven fabric and a nonwoven fabric element is formed between two opposing edge portions of the region free of nonwoven fabric, wherein the nonwoven fabric element is spaced apart from the opposing edge portions by a sub-region of the region free of nonwoven fabric;   connecting a plastic film to the sheet of nonwoven fabric such that, when the sheet of nonwoven fabric is viewed in plan view, the plastic film completely overlaps with the region free of nonwoven fabric and the nonwoven fabric element;   forming a through-hole in the plastic film and in the nonwoven fabric element;   welding a retaining plate to the plastic film and the nonwoven fabric element.   
     
     
         7 . The method according to  claim 6 , wherein the at least one through-opening include two through-openings, which are formed symmetrically with respect to an axis of symmetry that extends in the machine direction, and the two through-openings are punched such that the nonwoven fabric element remains between the two through-openings. 
     
     
         8 . The method according to  claim 6 , wherein a region of the sheet of nonwoven fabric including the region free of nonwoven fabric and the nonwoven fabric element has a rectangular boundary. 
     
     
         9 . The method according to  claim 6 , wherein the nonwoven fabric element comprises, before the through-hole is formed, a region in a shape of a disc and at least one connection piece, which connects the region in the shape of a disc to rest of the sheet of nonwoven fabric. 
     
     
         10 . The method according to  claim 9 , wherein the region in the shape of a disc is annular and the retaining plate is connected to the annular region of the nonwoven fabric element. 
     
     
         11 . The method according to  claim 10 , wherein the retaining plate comprises guides which are arranged in a region of the retaining plate surrounding a through-hole of the retaining plate, wherein a radial extension of the region of the retaining plate corresponds to that of the annular region of the nonwoven fabric element. 
     
     
         12 . The method according to  claim 6 , wherein the retaining plate and the plastic film are arranged such that the nonwoven fabric element is located between the retaining plate and the plastic film after connection of the retaining plate. 
     
     
         13 . The method according to  claim 6  to, wherein the retaining plate and the plastic film are arranged such that the plastic film is located between the retaining plate and the nonwoven fabric element after connection of the retaining plate. 
     
     
         14 . The method according to  claim 6 , wherein the region of the sheet of nonwoven fabric in which the at least one through-opening is to be formed is at least partially thermally compacted prior to punching of the at least one through-opening. 
     
     
         15 . The method according to  claim 6 , wherein the plastic film is connected to the nonwoven fabric element and to a part of the sheet of nonwoven material surrounding the region free of nonwoven fabric. 
     
     
         16 . The vacuum cleaner filter bag of  claim 1 , wherein the retaining plate is welded to the plastic film and the nonwoven fabric element. 
     
     
         17 . The method of  claim 8 , wherein the rectangular boundary comprises a square boundary.