Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.

Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.

Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention fixer including low melt fiber and an optional support frame and a method of making such pleated filter.

Abstract: A method and apparatus for continuously manufacturing filter units; each unit including a flow-through filter medium support frame with at least one sheet of filter medium extending across the flow-through opening of each unit with the edges thereof welded to the peripheral side edges of the unit frame.

Abstract: A self supporting pleated fluid filter medium having different fibers to provide pleats sufficiently self supporting to maintain pleated form during fluid filter treatment, the invention further including low melt fiber and an optional support frame and a method of making such pleated filter.

Abstract: An air filter has a generally rectangular frame having surfaces defining generally a plane, and a pair of parallel side rails and a pair of parallel end rails along outer edges of the plane-defining surfaces, the rails flaring outboardly at an obtuse angle from the plane when the frame is unconfined, one of the rails at each corner of the rectangular frame being provided with tabs, and the other, contiguous of the rails at the corner having an open end into which the tab extends. The tabs have an angled outer surface and are of a length compared with the height of the open end to be held against movement clear of the open end in every position of the rails when the frame is assembled, to limit the outward flare of the rails and to ensure that the corners of the rails are substantially closed in every position of the rails.

Abstract: A system for pleating a continuous strip of foldable material including feeding the strip of foldable material between adjacent flights of cooperatively positioned endless conveyors having pleat folding arms pivotally associated therewith which are alternatively and interfittingly positioned to pleat the strip of foldable material as it movingly passes from one end of adjacent flights to the other end thereof.

Abstract: A product wherein a layered web of melt blown fibrous filter media is produced by a unitary die including several die sources with facing layers of the fibrous filter media being attenuated by opposed fluid streams at preselected included angles and with the fiber layers being free from bonding together and with the fibers in each layer being minimally bonded.

Abstract: A method, die apparatus and product wherein a layered web of melt blown fibrous filter media is produced by a unitary die including several die sources with facing layers of the fibrous filter media being attenuated by opposed fluid streams at preselected included angles and with the fiber layers being free from bonding together and with the fibers in each layer being minimally bonded.

Abstract: A filter apparatus and method wherein successive layers of filter medium are spaced apart from each other a preselected distance to create a substantially direct, in-line through-flow void space therebetween evaluated upon the porosity and thickness of the successive filter mediums, pleated spacer/filter arrangements being employed to create a combined overall filter media with an included through-flow void space for fractionated distribution of particles between the successive layers of filter medium to maximize particulate holding capacity of the overall filter media.

Abstract: A filter bag assembly and method and machinery to form the same wherein spaced opposed filter bag panels are connected together by transversely extending preselectively sized binder strips fastened selectively at opposed ends to the spaced filter panels to restrain outward inflation of the filter bag.

Abstract: A die apparatus wherein a layered web of melt blown fibrous filter media is produced by a unitary die including several die sources with facing layers of the fibrous filter media being attenuated by opposed fluid streams at preselected included angles and with the fiber layers being free from bonding together and with the fibers in each layer being minimally bonded.

Abstract: A sound attenuating apparatus for noise bearing fluid streams wherein elongated perforated wall forming panel sheets include integrally formed indentations extending along a direction transverse the direction of the fluid stream to provide strength and stiffeners for the perforated panel sheets.

Abstract: A unique pulse-jet cartridge type particulate collector structure and method wherein horizontally disposed particulate filter cartridges are suspendedly disposed in a particulate separation chamber defined by an outer wall so that opposite ends of the suspended particulate filter cartridges are spaced from the opposed inner faces of the outer wall with dirty gas flow being delivered from a dirty gas inlet in the outer wall through the particulate filter cartridges in a smooth manner by a large particulate particle deflector and with the particulate hopper connected to the lower section of the outer wall having a transparent particulate catching container removably sealed in communicative relation with the particulate release opening of the particulate hopper.

Abstract: A pleated filter medium arrangement including a sheet of pleated porous filtering media nestingly engaged between adjacent pleats by a pleated sheet of thermobondable plastic screening with preselected facing opposite portions of the screening being heat bonded together.

Abstract: An apparatus and method for distributing pressurized fiber attenuating fluid through a melt blowing multi-headed die body uniformly and contaminant filtered with a minimum of energy loss before reaching the fluid attenuating outlets of the die body.

Abstract: A fluid filter arrangement including layered filter media capable of successively filtering varying sized particulate matter from a treated fluid stream with each layer of the layered filter media having a substantially equal terminal pressure drop thereacross.

Abstract: A particulate filter for a fluid stream being of preselected thickness with progressively increasing fibrous density from the upstream face toward the downstream face, the filter having a transversely and uniformly extending planar sheet-like adhesive barrier at a preselected location and quantity between the upstream and downstream faces thereof.