Abstract: An air filter including a filter media having a plurality of flat pleats defining a plurality of truncated pleat tips and sloping side surfaces along a front face and a rear face. The truncated pleat tips are oriented perpendicular to the direction of pleating and are configured with a planar tip portion. The reinforcement structure includes at least one generally planar first reinforcing strip oriented in the direction of the pleating and connected to the truncated pleat tips along the rear face. The reinforcing structure further includes at least one generally planar second reinforcing strip oriented in the direction of pleating and connected to the truncate pleat tips along the front face.

Abstract: An air filter including a filter media having a plurality of flat pleats defining a plurality of truncated pleat tips and sloping side surfaces along a front face and a rear face. The truncated pleat tips are oriented perpendicular to the direction of pleating and are configured with a planar tip portion. The reinforcement structure includes at least one generally planar first reinforcing strip oriented in the direction of the pleating and connected to the truncated pleat tips along the rear face. The reinforcing structure further includes at least one generally planar second reinforcing strip oriented in the direction of pleating and connected to the truncate pleat tips along the front face.

Abstract: A filter element, as in a filter bag, comprises a pocket having partitions between the side walls to form pocket portions. The margins of the partitions are welded ultrasonically to the inner surface of the layers. The inlet end of the partitions may be split into flaps to ease connection of the bag to a header frame. A simple yet effective method and apparatus may be utilizable to make the filter element, and a bag including it.

Abstract: A filter bag assembly of hybrid construction is disclosed that reduces the height of the filter bag assembly as well as its overall cost. The assembly indicates an elongated filter body portion, an end cap closing at one end of the filter body, a collar disposed at the other end of the filter body. The collar is molded onto the filter body and an inner venturi portion molded therewith. The assembly also includes a fabric extension portion that is attached to the interior of the collar. This extension may have a diameter greater than that of the collar so as to permit the filter body to be used in a tubesheet opening that is usually larger than that of the collar diameter. A snap band is contained within the collar for retaining the assembly in a tubesheet opening.

Abstract: A filter element, as in a filter bag, comprises a pocket having partitions between the side walls to form pocket portions. The margins of the partitions are welded ultrasonically to the inner surface of the layers. The inlet end of the partitions may be split into flaps to ease connection of the bag to a header frame. A simple yet effective method and apparatus may be utilizable to make the filter element, and a bag including it.