Air filter operable for filtering cabin air in vehicles, agricultural machinery, construction equipment and other work machines

An air filter element for filtering an air flow, comprising:

• an adsorption filter layer including:
• a plurality of individual adsorption layers, each having:
• a carrier stratum layer of a flat layer of filter medium or synthetic grid;
• and
• a bulk layer of activated carbon particles arranged on one side of the carrier stratum layer, the bulk layer of activated carbon particles layered onto the carrier stratum layer and fixed to the carrier stratum layer by an adhesive;
• wherein the plurality of individual adsorption layers are layered directly upon immediately adjacent individual absorption layers, onto either the carrier stratum layer or the bulk layer of active carbon of the immediately adjacent individual absorption layers, to form the adsorption filter layer;
• a circumferential sealing element operable for sealably separating a raw side from a clean side of a filter housing when the air filter element is installed into the filter housing;
• a fine filter layer configured for separating aerosols from the air flow, the fine filter layer arranged downstream of the adsorption filter layer at an outflow side of the adsorption filter layer.

An air filter element for filtering an air flow, comprising:

• an adsorption filter layer including:
• a plurality of individual adsorption layers, each having:
• a carrier stratum layer of a flat layer of filter medium or synthetic grid;
• and
• a bulk layer of activated carbon particles arranged on one side of the carrier stratum layer, the bulk layer of activated carbon particles layered onto the carrier stratum layer and fixed to the carrier stratum layer by an adhesive;
• wherein the plurality of individual adsorption layers are layered directly upon immediately adjacent individual absorption layers, onto either the carrier stratum layer or the bulk layer of active carbon of the immediately adjacent individual absorption layers, to form the adsorption filter layer;
• a circumferential sealing element operable for sealably separating a raw side from a clean side of a filter housing when the air filter element is installed into the filter housing;
• an inflow-sided prefilter layer having a porosity configured to separate dust from the airflow;
• wherein the inflow-sided prefilter layer is an unfolded or zigzag-folded filter medium made of cellulose, synthetic foam or synthetic fleece;
• wherein the prefilter filter layer comprises two layers, in combination:
• a spunbond fleece layer of polyamide (PA), polyester (PES) or polypropylene (PP);
• and
• a meltblown fleece layer of polyamide (PA), polyester (PES) or polypropylene (PP).

An air filter element for filtering an air flow, comprising:

• an adsorption filter layer including:
• a plurality of individual adsorption layers, each having:
• a carrier stratum layer of a flat layer of filter medium or synthetic grid;
• and
• a bulk layer of activated carbon particles arranged on one side of the carrier stratum layer, the bulk layer of activated carbon particles layered onto the carrier stratum layer and fixed to the carrier stratum layer by an adhesive;
• wherein the plurality of individual adsorption layers are layered directly upon immediately adjacent individual absorption layers, onto either the carrier stratum layer or the bulk layer of active carbon of the immediately adjacent individual absorption layers, to form the adsorption filter layer;
• a circumferential sealing element operable for sealably separating a raw side from a clean side of a filter housing when the air filter element is installed into the filter housing;
• an inflow-sided prefilter layer having a porosity configured to separate dust from the airflow;
• wherein the inflow-sided prefilter layer is an unfolded or zigzag-folded filter medium made of cellulose, synthetic foam or synthetic fleece;
• a plurality of the separate partial filter elements, each embodied as a separate partial filter element:
• the prefilter layer, the plurality of individual adsorption filter layers and/or a fine filter layer configured to separating aerosols from the air flow,
• wherein the plurality of separate partial filter elements forming the passenger compartment filter element are stacked adjacently one above the other and sealingly connected and secured together by a frame or a lateral strip surrounding and joining common narrow sides of the plurality of separate partial filter elements;
• wherein the frame or the lateral strip is injection molded onto, or welded to or glued onto the narrow sides of the plurality of separate partial filter elements;
• wherein the plurality of individual adsorption filter layers are joined together by a first sealingly circumferential lateral strip secured to the plurality of individual adsorption filter layers and circumferentially surrounding and joining together the plurality of individual adsorption filter layers forming a first partial filter element;
• wherein the prefilter layer includes a second sealingly circumferential lateral strip secured to the prefilter layer and circumferentially surrounding the prefilter layer forming the second partial filter element;
• wherein the fine filter layer includes a third sealingly circumferential lateral strip secured to the fine filter layer and circumferentially surrounding the fine filter layer forming the second partial filter element;
• wherein an additional circumferential lateral strip or plastic frame is overlaid directly onto and secured to the first, second and third circumferential lateral strips, joining together the first, second and third partial filter elements to form a complete filter element;
• wherein the circumferential sealing element is arranged on the additional circumferential lateral strip or plastic frame.

An air filter element for filtering an air flow, comprising:

• an adsorption filter layer including:
• a plurality of individual adsorption layers, each having:
• a carrier stratum layer of a flat layer of filter medium or synthetic grid;
• and
• a bulk layer of activated carbon particles arranged on one side of the carrier stratum layer, the bulk layer of activated carbon particles layered onto the carrier stratum layer and fixed to the carrier stratum layer by an adhesive;
• wherein the plurality of individual adsorption layers are layered directly upon immediately adjacent individual absorption layers, onto either the carrier stratum layer or the bulk layer of active carbon of the immediately adjacent individual absorption layers, to form the adsorption filter layer;
• a circumferential sealing element operable for sealably separating a raw side from a clean side of a filter housing when the air filter element is installed into the filter housing;
• an inflow-sided prefilter layer having a porosity configured to separate dust from the airflow;
• wherein the inflow-sided prefilter layer is an unfolded or zigzag-folded filter medium made of cellulose, synthetic foam or synthetic fleece;
• wherein at least one of:
• the prefilter layer, adsorption filter layer and a fine filter layer include a lateral strip surrounding narrow sides of the at least one layer with the lateral strip sealing connected with the at least one filter layer.