METHOD FOR APPLICATION BY USE OF AIR DOCTOR

PURPOSE:To improve an application quality by arranging a slit width of an air nozzle to be a specified size, a distance between an arrival point of a jet stream at a web and a tip of the air nozzle to be a length of specified times as long as the slit width and an angle formed by the direction of th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KITAHIRA KOICHI, KUROKAWA SHOICHI, KOBAYASHI SHIGERU
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	PURPOSE:To improve an application quality by arranging a slit width of an air nozzle to be a specified size, a distance between an arrival point of a jet stream at a web and a tip of the air nozzle to be a length of specified times as long as the slit width and an angle formed by the direction of the jet stream through the arrival point with a normal to be a specified magnitude. CONSTITUTION:An application liquid exceeding a prescribed amount is applied to a web W wound and allowed to run round a back roller by a fountain-type coater and adjusted to a prescribed film thickness by an air doctor. As for the aforementioned air doctor Ba and Bb, a slit width D of an air nozzle ejecting a jet stream is specified to be not wider than 600mum. At the same time, a distance L between an arrival point O of the jet stream at the web and a tip of the air nozzle is specified to be not longer than 3.5 times as long as the slit width D. Moreover, in a quadrant defined by the arrival point O as an origin, a normal Ox of the web surface and a tangent Oy in an application direction, an angle theta formed by a direction of jet stream through the origin O with the normal Ox is specified to be 37 deg. or larger. It is made possible, as a result, to improve an application quality of a low viscous liquid.