Abstract: A filter element, consisting of two pleated filter cloths has side frame members or strips and top and bottom frame members. The top and bottom edges of the cloths are encapsulated in the frame members, and the side edges of the filter cloths are clamped by the side frame members. This may be done by molding the frame members onto the cloth side edges, or by providing a slot in a tubular side frame member within which the side edges are held against the inner face of the slotted wall of the tube by a clamping member, such as a U-shaped strip, or by an indented part of the opposed wall.

Abstract: A filter element, consisting of two pleated filter cloths has side frame members or strips and top and bottom frame members. The top and bottom edges of the cloths are encapsulated in the frame members, and the side edges of the filter cloths are clamped by the side frame members. This may be done by molding the frame members onto the cloth side edges, or by providing a slot in a tubular side frame member within which the side edges are held against the inner face of the slotted wall of the tube by a clamping member, such as a U-shaped strip, or by an indented part of the opposed wall.

Abstract: A filter construction includes a pair of pleated filter elements (31, 32) mounted back to back to form a fluted double filter element and having their edges sealed by a sealant or being folded over within U-sectioned resistant edge strips The filter elements comprise a foraminous metal member (12) embedded within or faced on each side with a layer of non-women material (10), which is hydro entangled through the apertures of the metal member (12) and may include stainless steel fibres and the surface laminated or coated with a fluoropolymer.