A filter includes a pleated filter element having a fibrous support layer and a filtration layer bonded to the fibrous support layer. The fibrous support layer and the filtration layer are both in pleated form to provide a plurality of pleats. A cured stiffening agent is applied to the fibrous support layer, and the pleated form is maintained. The fibrous support layer is bonded to the filtration layer by other than the cured stiffening agent.

A conformable, unframed pleated air filter, comprising a plurality of bridging filaments on at least one face of the pleated air filter.

Filter media having a design embossed into the media are described. In some arrangements, the filter media is pleated filter media. In other arrangements, the filter media includes a plurality of channels, such as tetrahedron channels. The filter media includes a pattern of interrupted straight or angled embossments that help maintain separation between adjacent layers of the filter media. The embossments allow for two adjacent media layers (e.g., mating surfaces of the filter media) to remain separated, thereby increasing dust holding capacity and lowering pressure drop ever similarly configured filter media not having the embossments.

Filter media having a design embossed into the media are described. In some arrangements, the filter media is pleated filter media. In other arrangements, the filter media includes a plurality of channels, such as tetrahedron channels. The filter media includes a pattern of interrupted straight or angled embossments that help maintain separation between adjacent layers of the filter media. The embossments allow for two adjacent media layers (e.g., mating surfaces of the filter media) to remain separated, thereby increasing dust holding capacity and lowering pressure drop over similarly configured filter media not having the embossments.

A filter element for filtering a fluid has a zigzag-shaped folded filter medium with fold edges neighboring each other. A thread is attached by an adhesive material to the fold edges. The thread is a multiple-wound yarn. In a method for manufacturing the filter element, a thread in the form of a multiple-wound yarn is attached by an adhesive material to fold edges of a zigzag-shaped folded filter material. In the method, the thread is soaked and/or coated with the adhesive material that is in a plastic state. The thread soaked and/or coated with the adhesive material is attached to the fold edges by applying a pressure, and the adhesive material is hardened.

A blower includes an air introduction box, a casing, an impeller, a filter medium, a frame body, a first partition plate and a second partition plate. The filter medium captures a foreign matter contained in a first air and a second air flowing from the air introduction box to the impeller. The frame body houses the filter medium and is installed in a filter installation portion upstream of the impeller. The first partition plate is fixed to the frame body and divides a space upstream of the filter medium into a plurality of regions. The second partition plate is fixed to the frame body and divides a space downstream of the filter medium into a plurality of regions. The filter medium is interposed between the first partition plate and the second partition plate.

The present description provides a filter element that includes an end or side portion attached breather tube. One exemplary filter element described herein includes filter media having front and rear walls each including a proximal end and a distal end, a side portion at the proximal ends of the front and rear walls, and an outlet. The filter element further includes a breather tube attached to the filter media in fluid communication with the outlet. The outlet is positioned at least partially on the side portion, and the front and rear walls of the filter media are joined together at least partially along a perimeter.

The disclosure is directed toward presses which may comprise planar or curved press plates that can be driven toward and away from each other such as via linear reciprocating movement to press filter media sheets as opposed to using rolls. The press plates can create such features as embossments that may have the ridges and grooves, brands, creases or other such features. The press can create pleated packs or individual panels for non-pleated packs. Additionally, a variety of embossed pleat packs, unique shapes, structural components and other pleat packs that may be formed by presses or other methodology are disclosed as well as filter cartridges using such pleat packs.

A foldable filter comprising a pleated section, said pleated section having a plurality of pleats and where said filter is in its operating configuration, each pleat has an operating width (W) from an air direction facing tip of one pleat to an air direction facing tip of the next pleat which is from 5 to 10% of a pleat amplitude (A), where said pleat amplitude is from 15 to 30 mm, and wherein said filter comprises an adhesive melt on a portion of the pleat tips to prevent those pleats extending substantially beyond said operating width (W) and wherein the means for preventing a portion of the pleats from extending beyond said operating width is adhesive fixed to a plurality of air direction facing tips. The invention also relates to an air purifier comprising such a foldable filter, as well as the foldable filter in a folded configuration and a packaged foldable filter comprising secondary packaging.

A filter element for filtering a fluid has a frame and a filter bellows provided with a filter medium folded in a zigzag shape to folds. The filter bellows has an inflow face at a raw side of the filter bellows and an outflow face at a clean side of the filter bellows. The filter bellows is arranged in the frame. A seal is arranged circumferentially at least partially continuously at least in sections at an outer circumferential side of the filter medium at the inflow face of the filter bellows or at the outflow face of the filter bellows. Elongate adhesive sections are arranged along at least two adhesive tracks on the filter medium at the inflow face of the filter bellows and/or at the outflow face of the filter bellows. Strain-relief devices for compensating a length change of the at least two adhesive tracks in relation to the filter medium and/or to the seal are provided. A filter system is provided with such a filter element.