DE102007059052A1 - Filter element for use as interior filter element of motor vehicle, has sideband arranged in sealed manner and partly covered around edges of cartridge, where sideband is provided on exterior of cartridge with air-impermeable lamination - Google Patents

Abstract

The element (2) has a pleated filter cartridge functioning as a filtering medium, where a sideband is arranged in a sealed manner and partly covered around lateral edges of the filter cartridge. The sideband is provided on a sealed exterior (10) of the cartridge with a flexible, air-impermeable lamination (12). The lamination is achieved by connecting fiber spikes of cartridge material. The connection of the fiber spikes is realized by latex coating. The material is used as laminating material. Independent claims are also included for the following: (1) a filter module i.e. particle and/or odor filter, comprising a filter housing (2) a method for producing a filter element.

Description

Technical area

The The invention relates to a filter element, in particular a flexible one Filter element for filtering air for the interior of a motor vehicle. More particularly, the invention relates to such Filter element with strip-shaped frame elements. The The invention also relates to a method for producing the filter element as well as a filter module.

State of the art

One Such filter element is used to filter fluid flows or gaseous media, for example for filtering a Air flow, the vehicle interior of a motor vehicle is supplied. Although applicable to any filter elements, The present invention as well as the underlying Problem below with reference to a filter element for filtering of air for the interior of a motor vehicle described. Such filters will also be briefly referred to below as automotive cabin air filters designated.

The increasing air pollution, especially in large cities, in conjunction with the use of modern air conditioning makes it desirable and also required from the outside in the interior of a Motor vehicle guided and prepared or conditioned air filter by means of suitable filters. For this example comes Particle filter or odor filter or alternatively also combined Particulate and odor filters that are contained in the air Particles and inherent odors and gases from the To filter out ambient air as well as possible.

There the effectiveness of filters especially on size the air flowed through surface of the Filters are mainly used for automotive cabin air filters zig-zag folded filter media, often Also referred to as pleated filter media, for use. By The folding of the filter medium used can be dependent in this way the folding height and the folding distance of the different Folding sections of the filter medium an effective magnification the filter surface through which the air stream flows be made possible with the same space. To such filter elements in particular with zig-zag folded filter media To handle better assembly techniques, are reinforcing elements (Sidebands) provided. These reinforcing elements serve the lateral fixation and stabilization of the zigzag-shaped Filter medium and are by means of a suitable adhesive to the side Edges of the zigzag-shaped filter medium attached and aligned in the longitudinal direction of the filter medium. The filter element with the folded longitudinal sides strip-shaped mounted reinforcements can be easily assembled in this way a housing of a filter module or a corresponding Molding, for example in the inner lining of a motor vehicle, be inserted.

Such filter elements are, for example, from the EP 1 275 428 A1 , of the DE 202 11 834 U1 , of the DE 202 14 975 U1 and the DE 195 28 670 C2 known.

The DE 103 50 119 B3 discloses such a filter element which has at least two layers of an air-permeable carrier material, wherein the carrier material is preferably formed by spunbond or meltblown webs of polypropylene (PP) or polyether (PES).

From the DE 199 30 622 A1 is an odor or pollutant filter, in particular for ostomy bag known, in which the filter material between a gas and liquid-impermeable layer with a gas inlet opening and a gas and liquid-impermeable layer with a gas outlet opening is tightly welded integrated. The gas-impermeable release layers may be PES composite films.

For The use as a filter seal are, for example, polyurethane (PUR) foam gaskets made of closed-cell PUR foam very well suited. The leakage rate these seals are very low. Due to material equality (Varietal purity), fogging and the fact that these seals are due their porous structure (porosity) a possible Bacteria stove can represent these seals In cabin filters increasingly by fleece seals, for example. By PES fleece seals replaced. The disadvantage of these fleece seals is their about double to triple the leakage rate.

It There is therefore a need for nonwoven seals, for example PES fleece seals to create their leakage rates in the field of polyurethane foam seals lie.

Disclosure of the invention

It Therefore, the object of the present invention is a filter element with a fleece seal providing a low leakage rate shows.

It is a further object of the present invention, this a provide as easy to manufacture filter element.

These and other tasks are going through the filter element according to claim 1 and the method according to claim 7 solved.

Short description of the drawing

The The invention will be explained in more detail below with reference to the drawing explained. The only figure shows the structure of a Filter element with the sideband according to the invention.

Embodiment (s) of the invention

As shown in the figure, a filter element 2 proposed that from a zig-zag folded filter material 4 consists of, by means of a hot melt adhesive system 6 a nonwoven / fibrous layer 8th is fixed as a side band for sealing the filter element. The sideband is on the outside of the seal 10 in addition to the hotmelt or other adhesives currently available on the inside or pleated side with a flexible, air-impermeable lamination 12 Mistake. In this way, the leakage rate of the nonwoven seal can be reduced by a multiple.

The Lamination can be inexpensively on known lamination and easily done. The sealing properties the fleece seal, such as. Returning, flexibility, etc., depending on the type of lamination (eg, chemical adhesive compound, thermal fusion of pleat tips, thermal application a film, etc.) are largely preserved, so that a correct function of the sideband is guaranteed.

Possible Laminations are a lamination with PES or PP film, but also a compound of fiber constituents, which on the housing side up the seal become visible, with a latex order or similar Process (synthesized rubber, EPDM film, etc.) is possible.

The Lamination is applied to the nonwoven gasket in the form of a, if desired also applied to flexible and impermeable skin, whereby the skin must be able to lay flat on the frame. Preferred thicknesses of this skin are <1 mm.

comparative measurements have revealed that to one for this Purpose optimized filter (considering also the at Housings occurring dimensional deviations) the leakage rate already when using a plain textile-reinforced insulating tape could be reduced by 30% right away. An optimization of Surface texture further improves these values.

is the fleece seal towards the filter housing not closed, As is the case with the previous fleece seals, the Air is passed between the nonwoven fibers and the filter housing. The Surface of the fleece seal is therefore very "restless" and not smooth, d. h., housing surface and seal do not touch each other flatly. But is the sealing surface by the inventive application of the airtight Lamination on the outside of the seal (the side of the Seal, which faces the housing wall) between the filter housing and Seal is closed and there is enough pressure on the seal, no longer sweeps air directly along the filter wall. The air must now pass through the air-permeable fleece become. The fact that the fibers on the one hand in the fleece bottom and the other stuck in the laminating and pressed, is the flow resistance significantly higher than with an open fleece seal without a lamination according to the invention. This results in lower ones Leakage rates.

The Filter element according to the invention can be in each filter module be installed, which is a seal to reduce the leakage rate needed. The solution according to the invention serves to replace a PUR seal.

The Filter element consists of a zig-zag folded Filter material (pleated filter medium) made of pure polymer nonwovens (as polymers are polypropylene (PP), polyester (PES), polyethylene terephthalate (PET), polyurethane (PUR) and polycarbonate (PC) usable) u. U. additionally be equipped with activated carbon can. This filter material is by means of a hot melt adhesive system Fixed a side band according to the invention. The Hot melt adhesive system may be a PP-PES or other polyolefin hotmelt be. In principle, ethylene vinyl acetate (EVA) can also be used, However, this has due to its emission and fogging values and its temperature stability disadvantages. In addition, too crosslinkable systems such as PUR systems used.

to Production of the sideband according to the invention are basically all three-dimensional web forming process suitable. Usually, methods such as Needle consolidation, Malimo and carding.

The Lamination can be made from almost any polymer material In particular, PP, PES, PE, PET and EPDM are for Cabin filter makes sense.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 1275428 A1 [0005]
• - DE 20211834 U1 [0005]
• - DE 20214975 U1 [0005]
• - DE 19528670 C2 [0005]
• - DE 10350119 B3 [0006]
• - DE 19930622 A1 [0007]

Claims (11)

Filter element, in particular filter element for filtering air for the interior of a motor vehicle, with a functioning as a filter medium pleated filter element, with at least one sideband, which is arranged sealingly and at least partially frame-shaped around lateral edges of the filter insert, characterized in that the sideband on its outside provided with a flexible, air-impermeable lamination. Filter element according to claim 1, characterized in that in that a material selected as the lamination material is used is made of polypropylene (PP), polyester (PES), polyethylene terephthalate (PET), polyurethane (PUR) and polycarbonate (PC). Filter element according to claim 2, characterized in that that the lamination is a lamination with a PES or PP film is. Filter element according to one of claims 1 to 3, characterized in that the lamination by a compound the fiber tips of the filter insert material can be reached. Filter element according to claim 4, characterized in that that the connection of the fiber tips realized by a Latexauftrag is. Filter module, in particular particle and / or odor filter, with a filter housing, with at least one filter element according to at least one of the preceding claims, which is inserted sealingly in the filter housing. Method for producing a filter element according to at least one of claims 1 to 5, characterized through the following steps: a) Provide a zig-zag folded filter material; b) applying a nonwoven / fibrous layer on the filter material by means of a hot melt adhesive system; and c) Applying a flexible, air-impermeable lamination on the side facing away from the filter material of the nonwoven / fiber layer. Method according to claim 7, characterized in that in that a material selected is used as the lamination material is made of polypropylene (PP), polyester (PES), polyethylene terephthalate (PET), Polyurethane (PUR) and polycarbonate (PC). Method according to claim 7 or 8, characterized that the lamination by connecting the fiber tips of the Filter insert material is achieved. Method according to claim 9, characterized that the connection of the fiber tips realized by a latex application becomes. Use of a filter element according to one of the claims 1 to 5 as a cabin air filter element in a motor vehicle.