Pleated filter medium

Abstract

Pleated filter medium and filters having pleated filter medium are provided. In one embodiment, a pleated filter medium is provided having pleats with rectangular sides and a length direction parallel to the fold between the two sides of a pleat. The pleated filter medium has several rows of distance elements extending in a cross direction relative to the folds in the pleated filter medium. The rows are distanced from each other along a length direction, whereby each row of distance elements is constituted of a line of glue elements distanced from each other and applied to a side of the filter medium. Rows of glue elements are applied to both the inside and the outside of the filter medium, the rows on the inside being displaced in the length direction in relation to the rows on the outside.

What is claimed is: 
     
         1 . A pleated filter medium comprising:
 pleats with rectangular sides and a length direction parallel to a fold between the two sides of each pleat;   a plurality of rows of distance elements extending in a cross direction relative to the folds in the pleated filter medium, said rows being distanced from each other along a length direction, whereby each row of distance elements comprises a line of glue elements distanced from each other and applied to a side of the filter medium; and   a plurality of rows of glue elements applied to both an inside and an outside of the filter medium, the rows of glue elements on the inside being displaced in the length direction in relation to the rows of glue elements on the outside.   
     
     
         2 . The pleated filter medium according to  claim 1 , wherein the glue elements in each row of glue elements are distanced from each other in such a way that a glue element is applied to every side of each pleat. 
     
     
         3 . The pleated filter medium according to  claim 1 , wherein the glue elements in each row of glue elements are distanced from each other in such a way that a glue element is applied to every second side of each pleat. 
     
     
         4 . The pleated filter medium according to  claim 3 , wherein successive rows of glue elements on the inside and the outside of the filter medium are spaced the same distance from each other in the length direction, and the rows of glue elements on the outside of the filter medium are displaced half said distance from the rows of glue elements on the inside of the filter medium. 
     
     
         5 . The pleated filter medium according to  claim 4 , wherein the glue elements in the rows of glue elements on the inside are displaced also in a cross direction in relation to the glue elements in the rows of glue elements on the outside. 
     
     
         6 . The pleated filter medium according to  claim 1 , wherein at least one continuous glue line is applied in the cross direction in an end portion of the filter. 
     
     
         7 . The pleated filter medium according to  claim 1 , wherein a length of the glue elements in the cross direction is 10-80% of a width of the side of the pleat. 
     
     
         8 . The pleated filter medium according to  claim 2 , wherein successive rows of glue elements on the inside and the outside of the filter medium are spaced the same distance from each other in the length direction, and the rows of glue elements on the outside of the filter medium are displaced half said distance from the rows of glue elements on the inside of the filter medium. 
     
     
         9 . The pleated filter medium according to  claim 2 , wherein at least one continuous glue line is applied in the cross direction in an end portion of the filter medium. 
     
     
         10 . The pleated filter medium according to  claim 3 , wherein at least one continuous glue line is applied in the cross direction in an end portion of the filter medium. 
     
     
         11 . The pleated filter medium according to  claim 4 , wherein at least one continuous glue line is applied in the cross direction in an end portion of the filter medium. 
     
     
         12 . The pleated filter medium according to  claim 5 , wherein at least one continuous glue line is applied in the cross direction in an end portion of the filter medium. 
     
     
         13 . The pleated filter medium according to  claim 2 , wherein a length of the glue elements in the cross direction is 10-80% of a width of the side of the pleat. 
     
     
         14 . The pleated filter medium according to  claim 3 , wherein a length of the glue elements in the cross direction is 10-80% of a width of the side of the pleat. 
     
     
         15 . The pleated filter medium according to  claim 4 , wherein a length of the glue elements in the cross direction is 10-80% of a width of the side of the pleat. 
     
     
         16 . The pleated filter medium according to  claim 5 , wherein a length of the glue elements in the cross direction is 10-80% of a width of the side of the pleat. 
     
     
         17 . The pleated filter medium according to  claim 6 , wherein a length of the glue elements in the cross direction is 10-80% of a width of the side of the pleat. 
     
     
         18 . A filter comprising:
 a pleated filter medium comprising pleats with substantially planar, rectangular faces and a length direction parallel to a fold between the two adjacent planar faces of each pleat, and wherein the pleated filter medium has a truncated cone shape and includes an interior side and an exterior side, the pleated filter medium comprising:
 a plurality of rows of distance elements extending in a cross direction relative to the folds in the pleated filter medium, said rows of distance elements being distanced from each other along the length direction, whereby each row of distance elements is constituted of a line of glue elements distanced from each other and applied to the substantially planar faces of the filter medium; 
 wherein at least two rows of the plurality of rows of distance elements are applied to the substantially planar faces on opposing sides of the filter medium, the rows of glue distance elements on the interior side being displaced in the length direction in relation to the 
   rows of distance elements on the exterior side.   
     
     
         19 . The filter according to  claim 18 , wherein the pleated filter medium has a truncated cone-shape. 
     
     
         20 . The filter according to  claim 19 , wherein the distance elements in each row of distance elements are distanced from each other in such a way that the distance element is applied to every side of each pleat, and wherein successive rows of distance elements on the inside and the outside of the filter medium are spaced the same distance from each other in the length direction, and the rows of distance elements on the outside of the filter medium are displaced half said distance from the rows of distance elements on the inside of the filter medium.