Filter insert and process for producing it
Assignee"Jacobi" Systemtechnik GmbH
InventorKai Kahler
Life of this patent
Estimating the term…
Abstract
A filter insert (1A) for a fluid filter with an outer square or hollow cylindrical shape has a plurality of continuous zigzag folded walls (5) made of a fluid-permeable material (2) and provided in the plane of at least part of the folded walls with stiffening embossed depressions (3) and/or projections for keeping the walls folded. The depressions and/or projections of adjacent folded walls are interconnected at least in part and supported on each other. Stiff spacers are provided between the depressions or projections in at least part of their length for interconnecting them and supporting them on each other.
Claims23
A filter insert for a fluid filter, comprising:
- a material permeable to fluid and having a number of planar fold walls arranged in a substantially continuous zigzag shape and including depressions and/or elevations stamped into the plane of at least a part of a respective one of the fold walls in order to stiffen the fold walls, wherein the depressions and/or elevations each have a face with a longitudinal extent and two side walls, and adjacent fold walls connected at a common fold edge define a fold;
- a spacing between the longitudinal faces of the depressions and/or elevations of adjacent fold walls, said spacing having a thickness greater than that of the permeable material;
- and
- rigid spacers being placed in said spacing and joining a part of the longitudinal extent of the depressions and/or elevations of adjacent fold walls to achieve the spacing between the longitudinal faces of the depressions and/or elevations of adjacent fold walls.
A process for preparing a filter insert for a fluid filter, comprising steps of:
- providing a length of fluid-permeable material with a layer of impressions which determine future fold edges that define future fold walls when the material is folded along the impressions;
- stamping depressions and/or elevations into a plane of at least a part of the future fold walls in order to reinforce the future fold walls;
- folding the material along the impressions to form fold edges and to form a substantially continuous zigzag shape so that the depressions and/or elevations of adjacent fold walls are placed together with a space therebetween, said space having a thickness greater than the permeable material;
- and
- applying, before or during the folding, a spacer material to at least one of the depressions and/or elevations placed together as a result of the folding to achieve the spacing between the depressions and/or elevations of adjacent fold walls.
Dependencies are inferred from the claim text.