Air filter element and method of producing the same

A method of producing an air filter element used by closing both end surfaces of a hollow cylindrical filter portion by end plates, by forming an opening through which a fluid passes in the center of at least one end plate, and by fitting said opening on a cylindrical member, wherein

• a synthetic resin material, which is soft after curing, is poured to the inner periphery side of a ring-shaped concave portion in a mold formed with the ring-shaped concave portion for molding said one end plate;
• a synthetic resin material, which is rigid after curing, is poured to the outer periphery side of said ring-shaped concave portion;
• and the end surface of said filter portion is inserted into said ring-shaped concave portion to integrally cure both of said synthetic resin materials, whereby
• an air filter element is produced in which said one end plate comprises a soft inner peripheral seal portion capable of sticking to the outer surface of said cylindrical member and a rigid closure portion which is disposed on the outer periphery side of said inner peripheral seal portion and in which the end surface of said filter portion is embedded, said end plate being of composite construction in which said inner peripheral seal portion and said closure portion are integrally molded.

A method of producing an air filter element used by closing both end surfaces of a hollow cylindrical filter portion by end plates, by forming an opening through which a fluid passes in the center of at least one end plate, and by fitting said opening on a cylindrical member, wherein

• a mold is used which is provided with a ring-shaped inner peripheral concave portion for molding said soft inner peripheral seal portion, a ring-shaped convex portion for forming said groove, and a ring-shaped outer peripheral concave portion for molding said rigid closure portion successively from the inside in the radial direction;
• a synthetic resin material, which is soft after curing, is poured into said ring-shaped inner peripheral concave portion;
• a synthetic resin material, which is rigid after curing, is poured into said ring-shaped outer peripheral concave portion;
• and the end surface of said filter portion is inserted into said ring-shaped outer peripheral concave portion to integrally cure both of said synthetic resin materials, whereby
• an air filter element is produced in which said one end plate comprises a soft inner peripheral seal portion capable of sticking to the outer surface of said cylindrical member and a rigid closure portion which is disposed on the outer periphery side of said inner peripheral seal portion and in which the end surface of said filter portion is embedded, said end plate being of composite construction in which said inner peripheral seal portion and said closure portion are integrally molded;
• on the outer periphery side of said inner peripheral seal portion, a groove axially extending from the end surface of said end plate is formed along said opening;
• and on the outer periphery side of said groove, said closure portion is formed.

A method of producing an air filter element used by closing both end surfaces of a hollow cylindrical filter portion by end plates, by forming an opening through which a fluid passes in the center of at least one end plate, and by fitting said opening on a cylindrical member, wherein

• a soft seal member having been molded in advance is disposed on the inner periphery side of a ring-shaped concave portion in a mold formed with the ring-shaped concave portion for molding said one end plate;
• a synthetic resin material, which is rigid after curing, is poured to the outer periphery side of said ring-shaped concave portion;
• and the end surface of said filter portion is inserted into said ring-shaped concave portion to cure said synthetic resin material integrally with said seal member, whereby
• an air filter element is produced in which said one end plate comprises a soft inner peripheral seal portion capable of sticking to the outer surface of said cylindrical member and a rigid closure portion which is disposed on the outer periphery side of said inner peripheral seal portion and in which the end surface of said filter portion is embedded, said end plate being of composite construction in which said inner peripheral seal portion and said closure portion are integrally molded.