Delstar Technologies, Inc.

Swm Luxembourg S.a.r.l.

Joel Patrick Trojnar

Ronald Federico

Andrew G Platt

Andrew Gordon Platt

Ronald Frederico

Support membranes for filters are described that include a support sheet formed of a polymeric material and a continuous base section having opposed outer surfaces and spaced-apart ribs extending outwardly from at least one of the opposed outer surfaces. The spaced-apart ribs define continuous flow channels bound by the adjacent spaced-apart ribs. The ratio of the height of the ribs to the height of the continuous base ranges from about 2:1 to about 5:1. This relatively high aspect ratio of the ribs and the base layer increases the performance of the filter and reduces the cross-flow pressure drop of fluids filtered through the membrane.

Fluoroplastic support membrane

A filter support sheet extruded from a fluoroplastic material includes a base section having spaced-apart ribs extending outwardly from at least one surface thereof. Segments between spaced-apart ribs provide flow channels and apertures are punched through the sheet in a predetermined pattern unaffected by the structure of the support sheet. A method includes the steps of: (1) extruding a thermoplastic, fluoroplastic material to form of a sheet; (2) passing the sheet through a nip region provided by opposed rollers; at least one having an outer surface with counter-sunk grooves. Counter-sunk grooves in one roller are aligned with an outer surface or counter-sunk grooves of the other roller in the nip region to form a ribbed sheet having ribs upstanding from at least one surface of said sheet; (3) setting the ribbed sheet and (4) punching apertures through the ribbed sheet in a predetermined pattern.

Ribbed and apertured fluoroplastic support sheet for a filter substrate and method of making same

A device for slitting a tubular workpiece into strips includes radially disposed cutting members. The device may include a tapered infeed mandrel for maintaining tension on the tubular workpiece being slit and optionally an exit mandrel. In embodiments, the position of the radially disposed cutting members may be adjustable.

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Smyrna, DE, United States of America

Joel Patrick Trojnar