Filter element and method for producing a filter element

Patent metadata

Field	Value
Publication number	US-9669341-B2
Application number	US-201414444336-A
Country	US
Kind code	B2
Filing date	Jul 28, 2014
Priority date	Jan 26, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

A filter element has a filter body of at least one layer of a flat web-shaped filter medium, separating a raw side from a clean side of the filter element. A hot melt system is provided and the filter body is glued together by the hot melt system. The hot melt system has a hot melt mixture that is made up of 15-85% by weight of a first hot melt that is polyester-based and 15-85% by weight of a second hot melt that is polyamide-based. The first hot melt and the second hot melt together amount to 100% by weight of the hot melt mixture. The hot melt mixture constitutes a proportion of more than 75% by weight of the hot melt system. The remainder of the hot melt system is made up of fillers, pigments, tackiness-imparting resins, and hot melts based on a polycondensate.

First claim

What is claimed is:

1. A filter element comprising:
a filter body of at least one layer of a flat web-shaped filter medium, the web-shaped filter medium separating a raw side from a clean side of the filter element;
a hot melt system;
wherein the filter body is glued together by the hot melt system;
wherein the hot melt system comprises a hot melt mixture and the hot melt mixture comprises:
30-70% by weight of a first hot melt that is polyester-based, the polyester-based first hot melt having a total proportion of adipic acid added into composition forming the first hot melt of >5% by weight and <35% by weight;
30-70% by weight of a second hot melt that is polyamide-based, the polyamide-based second hot melt having a total proportion of adipic acid added into composition forming the second hot melt of >5% by weight and <35% by weight;
wherein the added adipic acid added to the polyester-based first hot melt and added to the polyamide-based second hot melt reduces stringing tendency and improves the heat resistance of the hot melt mixture;

wherein the first hot melt and the second hot melt together amount to 100% by weight of the hot melt mixture;
wherein the hot melt mixture constitutes a proportion of more than 75% by weight of the hot melt system;
wherein the remainder of the hot melt system is selected from the group consisting of fillers, pigments, tackiness-imparting resins, and hot melts based on a polycondensate,
wherein the hot melt system includes the tackiness-imparting resins;
wherein the tackiness-imparting resins includes a resin selected from the set including: a hydrogenated cycloaliphatic hydrocarbon resin or an aliphatic or alicyclic petroleum hydrocarbon resin,
wherein the filter body is provided on at least one surface of the flat web-shaped filter medium with a uninterrupted and sealing adhesive bead of the hot melt system,
wherein the adhesive bead glues the filter body in such a way that the raw side and the clean side of the filter element are separated seal-tightly from each other.

2. The filter element according to claim 1 , wherein
wherein the tackiness-imparting resins further includes a resin selected from the set including: an aromatic, aliphatic, or cycloaliphatic hydrocarbon resin.

3. The filter element according to claim 1 , wherein
the web-shaped filter medium is a zigzag-folded filter medium sheet that is formed to an annular filter bellows of a closed ring shape constituting the filter body,
wherein the adhesive bead is applied to two oppositely positioned end sections of the filter medium sheet, the end sections extending parallel to fold edges of the zigzag-folded filter medium sheet,
wherein the adhesive bead extends along end edges of the end sections and seal-tightly connects the end sections to form the closed ring shape.

4. The filter element according to claim 3 , wherein
the adhesive bead extends between the end edges and the fold edges that are closest to the end edges.

5. The filter element according to claim 4 , wherein
the adhesive bead extends centrally between the end edges and said fold edges closest to the end edges.

6. The filter element according to claim 5 , wherein
the end sections with the adhesive bead are pressed together with a corrugated profile.

7. The filter element according to claim 3 , wherein
the adhesive bead extends along an entire length of the end edges.

8. The filter element according to claim 3 , further comprising
end disks that are arranged at axial end faces of the annular filter bellows and seal-tightly close off the axial end faces such that the raw side is separated from the clean side,
wherein the adhesive bead is connected seal-tightly with the end disks.

9. The filter element according to claim 1 , wherein
the filter body is comprised of a semi-finished product that comprises
a first layer and a second layer of the flat web-shaped filter medium resting on each other,
wherein the first layer is a flat layer and the second layer is a corrugated layer,

wherein the semi-finished product is wound or stacked so that the first and second layers alternate and between the first layer and the second layer and between the second layer and the first layer of adjacent layers of the semi-finished product channels allowing flow therethrough are formed,
wherein the first and second layers are connected to each other, respectively, by a first uninterrupted adhesive bead of the hot melt system,
wherein the first adhesive bead extends along a first edge of the first layer on a first flat side of the first layer and along a first edge of the second layer in a space between the first flat side and the second layer in a direction perpendicular to corrugations of the second layer such that the channels allowing flow therethrough are seal-tightly closed off at a first end.

10. The filter element according to claim 9 , wherein
a second uninterrupted adhesive bead of the hot melt system is provided that connects the first and second layers to each other,
wherein the second adhesive bead is applied onto a second flat side of the first layer opposite the first flat side along a second edge of the first layer opposite the first edge of the first layer in a space between the second flat side and the second layer in the direction perpendicular to the corrugations such that the channels allowing flow therethrough are seal-tightly closed off at a second end opposite the first end such that the filter body has alternatingly closed-off channels.

11. The filter element according to claim 10 , wherein
the semi-finished product is wound to a coil, and
wherein the first and second layers are connected to each other by at least one third adhesive bead of the hot melt system,
wherein the at least one third adhesive bead extends on a side of the first layer which is facing corrugation peaks of the corrugations of the second layer in a direction transverse to the corrugations such that the corrugation peaks resting at the first layer are glued to the first layer,
wherein a height of the at least one third adhesive bead is less than a height of the corrugations so that the channels allowing flow therethrough are not closed off by the at least one third adhesive bead.

12. The filter element according to claim 1 , wherein
the filter body is formed of a semi-finished product that comprises
a first layer and a second layer of the web-shaped filter medium resting on each other,
wherein the first layer is a flat layer and the second layer is a corrugated layer,

wherein the semi-finished product is wound to a coil so that between the first and second layers channels allowing flow therethrough are formed,
wherein the first and second layers are connected to each other by at least one adhesive bead of the hot melt system,
wherein at least one adhesive bead extends on a side of the first layer which is facing corrugation peaks of corrugations of the second layer in a direction transverse to the corrugations such that the corrugation peaks resting at the first layer are glued to the first layer,
wherein a height of the at least one adhesive bead is less than a height of the corrugations so that the channels allowing flow therethrough are not closed off by the at least one adhesive bead.

13. The filter element according to claim 1 , wherein
the filter body is a filter bellows,
wherein the flat web-shaped filter medium is a zigzag-folded filter medium sheet forming the filter bellows,
wherein along terminal edges of the filter medium sheet that are extending perpendicular to fold edges of folds of the filter medium sheet an uninterrupted adhesive bead of the

Assignees

• Mann & Hummel Gmbh

Inventors

• Majer Tanja
• Vilsmaier Gerhard

Classifications

• B01D46/523

  with means for maintaining spacing between the pleats or folds · CPC title

• B01D46/0001

  Making filtering elements · CPC title

• B32B2037/1269

  multi-component adhesive · CPC title

• B01D39/08

  Filter cloth, i.e. woven, knitted or interlaced material (metallic B01D39/10) · CPC title

• B01D46/0005 Primary

  Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence) · CPC title