Patent ID: 6193830
Filing Date: 2001-02-27
Classification: B01D,Y10T

Abstract:
A method for manufacturing a filter insert made of thermoplastically bondable nonwoven material, comprising the steps of:(1) folding a planar filter medium and then setting the filter medium at a preset fold spacing to form a folded pack having a fold geometry and dimensions;(2) providing clamping profiles substantially corresponding to the fold geometry and dimensions of the folded pack and clamping two outer edges of the folded pack in the clamping profiles, such that the clamping profiles engage the top and bottom of the folds, wherein the material of the folded pack projects beyond the clamping profiles at each outer edge a distance less than the distance of the fold spacing;(3) placing a sealing band, corresponding in width substantially to a height of the folds, on each outer edge on the long sides of the folded pack;(4) compressing and thermally bonding, by pressure elements, each sealing band to the respective outer edge of the folded pack, forming bond points compressed until cool, wherein the sealing bands are melted in a linear fashion to bond the sealing bands to the outer edges of the folded pack, and wherein at least two straight-line bonding beads, running parallel to one another, are formed along each outer edge of the folded pack and bound at least one substantially uncompressed section;(5) removing the profiles; and(6) cutting the folded pack to a desired length.