CURTAIN COATING METHOD

• Main Authors: WANG, CHUNHWA, JANSEN, ALEXANDER, A, FERMIN, ROBERT, J
• Format: Patent
• Language: English; French; German
• Published: 18.11.2009
• Subjects: APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING

The invention relates to a curtain coating system (10) comprising a substrate (12), a conveyor (22/24) that conveys the substrate (12) in a downstream direction (D) through an impingement zone (14), and a free-falling curtain (16) that impinges the substrate (12) in the impingement zone (14) at an impingement angle (¸) to form a coating (18) on the substrate (12) of a desired coating weight (ctwt); wherein: the impingement angle (¸) is less than 90°; the force ratio (Re) is greater than about 5.25; and the coating (18) has a thickness (t w ) that varies less than 2% from a predetermined uniform final coating thickness (tˆž) over the width (w) of the coating (18).