Abstract: Non-shedding light duty fibrous filter material containing activated carbon and/or other sorbtive granules is disclosed having a thickness of ? inch to ? inch and composed entirely of low melt fibers of 4 to 15 denier. Heavy duty filter material, also of a non-shedding clean character, is of ¾ to 1 inch thickness and comprises a mixture of 70% structural fibers and 30% low melt fibers.

Abstract: Non-shedding light duty fibrous filter material containing activated carbon and/or other sorbtive granules is disclosed having a thickness of ⅛ inch to ⅜ inch and composed entirely of low melt fibers of 4 to 15 denier. Heavy duty filter material, also of a non-shedding clean character, is of ¾ to 1 inch thickness and comprises a mixture of 70% structural fibers and 30% low melt fibers.

Abstract: A random fiber web with a uniformly distributed sorbent particle is described. In order to provide a uniform distribution of the sorbent particle within the random fiber web, it is proposed to combine the sorbent particles and fibers in the web during its formation. The fibers are joined in such a way that the sorbent particles are secured within the web in a uniform distribution. The fibers are joined with the use of dry adhesives, UV hardenable adhesives, low melting fibers, spraying a liquid adhesive or needling. The invention also extends to a machine for making random fiber webs and a method of making a thin bed filter for removing odors and particulates.

Abstract: An odor-removing filter approaching the carbon-particle loading of a filled filter may be formed by spraying or roll coating the adhesive against one or more faces of a porous, fibrous, air-permeable mat, depositing carbon particles or other odor-removing particles of a size to compliment the void size of the mat on the adhesive coated face or faces of the mat and then driving the particles into the mat and thereafter curing the adhesive to lock the particles into the mat. The adhesive bond of the particles to the mat is improved by working the particles against the adhesive-coated fibers. An overspray of an adhesive may also be utilized to further improve the retention of the particles. So-called "clean filters" may be produced according to the method disclosed, wherein a white, fibrous mat has carbon particles loaded on one face while the opposite face appears white or "clean". An indicator filter notifying the user when the filter becomes grease laden may also be formed following the methods used herein.

Abstract: An odor-removing filter approaching the carbon- particle loading of a filled filter may be formed by spraying or roll coating the adhesive against one or more faces of a porous, fibrous, air-permeable mat, depositing carbon particles or other odor-removing particles of a size to compliment the void size of the mat on the adhesive coated face or faces of the mat and then driving the particles into the mat and thereafter curing the adhesive to lock the particles into the mat. The adhesive bond of the particles to the mat is improved by working the particles against the adhesive- coated fibers. An overspray of an adhesive may also be utilized to further improve the retention of the particles. So-called "clean filters" may be produced according to the method disclosed, wherein a white, fibrous mat has carbon particles loaded on one face while the opposite face appears white or "clean". An indicator filter notifying the user when the filter becomes grease laden may also be formed following the methods used herein.

Abstract: Described is a gas phase permeable filter and method for making same comprising the steps:1. providing a gas phase permeable substrate having opposite surfaces;2. applying an adhesive to one or both of the surfaces of the substrate;3. applying particulate gas phase odor-removing means to the adhesive coated surface or surfaces of the substrate;4. drying the adhesive; and5. assembling the substrate in a desired filter configuration wherein the outer surface of the filter is a surface of the substrate free of particulate gas phase odor-removing means and the inner surface of the filter is a surface of the substrate coated with the particulate gas phase odor-removing means adhesively secured thereto.

Abstract: Described is a gas phase permeable filter and method for making same comprising the steps:1. Providing a gas phase permeable substrate having opposite surfaces;2. Applying an adhesive to one or both of the surfaces of the substrate;3. Applying particulate gas phase odor-removing means to the adhesive coated surface or surfaces of the substrate;4. Drying the adhesive; and5. Assembling the substrate in a desired filter configuration wherein the outer surface of the filter is a surface of the substrate free of particulate gas phase odor-removing means and the inner surface of the filter is a surface of the substrate coated with the particulate gas phase odor-removing means adhesively secured thereto.