Vacuum Cleaner Filter Bag

Abstract

The invention relates to a vacuum cleaner filter bag made of a filter material, comprising at least three layers with at least two layers of a non-woven or non-woven fabric layer, and at least one layer of a fibre web layer of fibres and/or filaments, wherein the at least two non-woven layers and the at least one fibre web layer are connected to each other by a thermal bonding connection.

1 . Vacuum cleaner filter bag of a filter material comprising at least three layers with
 at least two layers of a non-woven or non-woven fabric layer, and   at least one layer of a fibre web layer of fibres or filaments, wherein   the at least two non-woven layers and the at least one fibre web layer are connected to each other by a thermal bonding connection.   
     
     
         2 . Filter bag according to  claim 1 , wherein a pressing area proportion of a thermal bonding pattern is maximally 5% of a surface of an area of the filter bag through which a flow can pass, and on average maximally 19 thermal bonding connections per 10 cm 2  are present. 
     
     
         3 . Filter bag according to  claim 1 , wherein an average total porosity is at least 65%. 
     
     
         4 . Filter bag according to  claim 1 , wherein an average median pore diameter is at least 120 μm. 
     
     
         5 . Filter bag according to  claim 1 , wherein on average maximally 10 thermal bonding connections per 10 cm 2  are present. 
     
     
         6 . Filter bag according to  claim 1 , wherein the thermal bonding connection has a star-shaped, punctiform, bar-shaped or linear design. 
     
     
         7 . Filter bag according to  claim 1 , wherein a pressing area proportion of the thermal bonding pattern is maximally 2%. 
     
     
         8 . Filter bag according to  claim 1 , wherein the fibres comprise a form of staple fibres, and wherein the staple fibres comprise split fibres or crimp fibres. 
     
     
         9 . Filter bag according to  claim 8 , wherein the fibres have a length of between 1 and 100 mm. 
     
     
         10 . Filter bag according to  claim 8 , wherein the crimp fibres have different spatial structures, comprising a zig-zag, wave or spiral type. 
     
     
         11 . Filter bag according to  claim 8 , wherein the crimp fibres comprise a form of mechanically crimped fibres or autocrimp fibres or bicomponent fibres. 
     
     
         12 . Filter bag according to  claim 8 , wherein the fibres are electrostatically charged. 
     
     
         13 . Filter bag according to  claim 8 , wherein the staple fibres comprise a form of natural or synthetic fibres. 
     
     
         14 . Filter bag according to  claim 1 , wherein a mass per unit area of the fibre web layer is between 10 and 200 g/m 2 . 
     
     
         15 . Filter bag according to  claim 1 , wherein the fibre web layer has a mass per unit area of at least 5 g/m 2 . 
     
     
         16 . Filter bag according to  claim 15 , wherein the non-woven layer is a scrim. 
     
     
         17 . Filter bag according to  claim 1 , comprising two non-woven layers between which the fibre web layer is arranged. 
     
     
         18 . Filter bag according to  claim 17 , wherein at least one non-woven layer comprises a fine filter spunbond fabric layer. 
     
     
         19 . Filter bag according to  claim 1 , further comprising a fine filter spunbond fabric layer. 
     
     
         20 . Filter bag according to  claim 19 , wherein at least one non-woven layer comprises a second fine filter spunbond fabric layer and wherein the fine filter spunbond fabric layers comprise different filter properties. 
     
     
         21 . Filter bag according to  claim 1 , comprising a further layer comprising paper, non-woven material or nanofibres.