Laminates of asymmetric membranes

The present invention is directed to composite filters and methods for preparing same. More specifically, it is directed to filter laminates of multiple discreet layers of material bonded together, with at least one of the layers being an asymmetric membrane. The laminates may be prepared using a la...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	RICHARD MORRIS, MIKE GAUGHAN, JEROME F. DITTER, STEVEN LAMON, REY SARABIA, RICHARD MC DONOGH, TODD BENSON, I-FAN WANG
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES INKS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES SEPARATION TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The present invention is directed to composite filters and methods for preparing same. More specifically, it is directed to filter laminates of multiple discreet layers of material bonded together, with at least one of the layers being an asymmetric membrane. The laminates may be prepared using a lamination apparatus including an unwind (10) for, e.g., a low melting point polypropylene nonwoven material (12), a membrane unwind (14) for, e.g., a polyvinylidene difluoride membrane (16), and an unwind (18) for, e.g., a polyester nonwoven material (20). An adjustable, lateral spring force is applied to the unwind to maintain the stiffness of the material, thereby preventing formation of wrinkles in the laminate (22). Adjustable rollers (24) provide additional tension and also aid in wrinkle elimination. The layers (12, 16, 20) are pulled out from the unwinds (10, 14, 18) and over the heat shoe (26) by feeding the resulting laminate (22) between two drive rollers (30) situated after the heat shoe (26). A rewind (32) winds up the full width laminate (22).