Method and arrangement for the manufacture of filters

Claim 3

A method according to Claim 1, characterized in that the continuous length (5) of filter material is folded and is provided with the aforementioned strips in an essentially continuous process with uninterrupted movement of the continuous length of filter material, in conjunction with which the filter material is cut into fairly short pieces, after having left the arrangements for the joining together of the lateral edges of the continuous length of filter material, for the purpose of forming filter material bodies of pre-determined length in this way.

Claim 4

An arrangement for the manufacture of filters in which a filter material in the form of a continuous length (5) is zig-zag folded to form pleats (39) which are attached to each other at their ends along the lateral edges of the filter material and are sealed in this way one against the other so as to form a flow path for the medium which is to be filtered into the spaces between the pleats on one side of the filter material, through the material, and out into the spaces between the pleats on the other side of the filter material, whereby during the process of attaching the ends of the pleats to one another, the pleats are kept separated from one an other by a pre-determined distance between their outer folded edges by introducing protrusions of a number of comb-shaped organs (20) inside the pleats holding them in this way at the aforementioned predetermined distance from one another, characterized in, that a number of screws (20) is provided as said comb-shaped organs with the treads of the screws defining the protrusions inserted into the pleats, that said screws (18) are provided to rotate in such a way that the apparent axial feeding movement of the threads follows the movement of the folds in the continuous length of filter material and keeps these separated for the purpose of joining together the end edges of the pleats along the lateral edges of the continuous length of filter material by means of strips (24) in the form of elongate tapes which are fed in the direction of the lateral edges of the continuous length (5) of filter material during the aforementioned movement of the filter material, conveyors (9) in the form of belts (38) being so arranged as to run along the continuous length (5) of filter material and as to force strips (24) against its lateral edges, in conjunction with which the screw device and the conveyors interact during movement of the folded continuous length of filter material, the strips being attached after having been pressed against the filter material, and accompany it for subsequent securing by means of an adhesive applicator (27) as the filter material moves along and that a number of rollers (41) are provided on a certain distance over a surface of which the length of material is supported during its feeding so the pleated length of filter material during its movement is forced to pass between the supporting surface and the rollers (41) with the spreading of the pleats being determined by the distance between said surface and said rollers allowing the pleats to pass by having a certain angle to the longitudinal direction of the length of the filter material.

Claim 5

An arrangement for the manufacture of filters in which a filter material in the form of a continuous length (5) is zig-zag folded to form pleats (39) which are attached to each other at their ends along the lateral edges of the filter material and are sealed in this way one against the other so as to form a flow path for the medium which is to be filtered into the spaces between the pleats on one side of the filter material, through the material, and out into the spaces between the pleats on the other side of the filter material, whereby during the process of attaching the ends of the pleats to one another, the pleats are kept separated from one an other by a pre-determined distance between their outer folded edges by introducing protrusions of a number of comb-shaped organs (20) inside the pleats holding them in this way at the aforementioned predetermined distance from one another, characterized in, that a number of screws (20) is provided as said comb-shaped organs with the treads of the screws defining the protrusions inserted into the pleats, that said screws (18) are provided to rotate in such a way that the apparent axial feeding movement of the threads follows the movement of the folds in the continuous length of filter material and keeps these separated for the purpose of joining together the end edges of the pleats along the lateral edges of the continuous length of filter material by means of strips (24) in the form of elongate tapes which are fed in the direction of the lateral edges of the continuous length (5) of filter material during the aforementioned movement of the filter material, conveyors (9) in the form of belts (38) being so arranged as to run along the continuous length (5) of filter material and as to force strips (24) against its lateral edges, in conjunction with which the screw device and the conveyors interact during movement of the folded continuous length of filter material, the strips being attached after having been pressed against the filter material, and accompany it for subsequent securing by means of an adhesive applicator (27) as the filter material moves along and that a number of rollers (41) are provided on a certain distance over a surface of which the length of material is supported during its feeding so the pleated length of filter material during its movement is forced to pass between the supporting surface and the rollers (41) with the spreading of the pleats being determined by the distance between said surface and said rollers allowing the pleats to pass by having a certain angle to the longitudinal direction of the length of the filter material.

Claim 6

An arrangement according to Claim 3, characterized in that a cutting arrangement (30) is provided in conjunction with and at a certain distance from the aforementioned devices (9, 18), by means of which arrangement the continuous length (5) of filter material is cut into fairly short pieces.