摘要:
A filter media product and method of making the same wherein the filter media is pleatable and has at least one support scrim comprised of a melt bonded non-woven material or a fuse bonded non-woven material bonded to a layer of expanded polytetrafluoroethylene. The filter media may have a single support scrim with one or more layers and optionally may have a support scrim on both an upstream and downstream surface where both or neither support scrim is multilayered. The filter media may have an efficiency greater than, equal to, or less than HEPA.
摘要:
A filter media product and method of making the same wherein at least two independent filter media thicknesses of differing coarse and fine pore sizes are held in face-to-face relationship with the pore sizes being so calculated that the overall average pore size of successive thicknesses is smaller than the pore size of the finest fiber thickness.
摘要:
A valve comprises a housing (1) having an inlet (4) and an outlet (5), and a pressure sensing port (8). A piston (6) slides in a part (3) of the housing (1) in response to a difference between a first fluid pressure at the pressure sensing port on the one side of the piston, and a second fluid pressure at the inlet and/or outlet on the other side of the piston (6). A valve member (7) carried by the piston is operable thereby to close the inlet (4) when said second fluid pressure is less than a value sufficiently greater than said first fluid pressure. The valve member (7) is movable with respect to the piston (6) to facilitate closing of the inlet (4), in response to a fluid flow from the housing (1) to the inlet (4), when the piston is not acting to close the inlet.
摘要:
A filter comprising a single length of filter material with a longitudinal axis wherein the length of filter material has a contour of elongated depressions and swells or apices substantially parallel to the longitudinal axis, the filter material further has folds substantially perpendicular to the longitudinal axis of the filter material forming pleats at substantially equal intervals. A process of making the filter and apparatus used in the process are a part of the instant invention.
摘要:
A filter media product and method of making the same wherein at least two independent filter media thicknesses of differing coarse and fine pore sizes are held in face-to-face relationship with the pore sizes being so calculated that the overall average pore size of successive thicknesses is smaller than the pore size of the finest fiber thickness.
摘要:
An arrangement for forming a web of fibrous media wherein at least one formed layered portion is attenuated from a first die source selectively unto a first collector and successively combining such portion with at least another formed layered portion which is attenuated from a second die source selectively unto a second collector, at least one of the outer surfaces of the web of fibrous media being of comparatively smooth skin-like nature to minimize projecting fiber ends.
摘要:
A unified arrangement for providing a unique nanofibrous porous media formed as a chemical compound from a water-soluble polymer combined with a cross-linking agent with a balance of water, which chemical compound prevents the polymer from dissolving in water, including a humid environment.
摘要:
An arrangement for producing a fibrous mat from a heated die source wherein the produced mat includes a first layered, preselected fiber portion of substantially straight fibers produced by directing such fibers directly to a collector source and a second layered preselected fiber portion of substantially curled fibers produced by diverting and exerting an external vortically creative curling force thereon before reaching the collector source.