Process for two-sided coating of a web

In the two-sided coating of a web by feeding the web through the nip of a pair of pressing rolls onto which the coating substance is metered, the amount of the coating substance applied to each pressing roll is measured by infrared absorption and the relative coating quantities RWo onto the upper si...

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Bibliographische Detailangaben
Hauptverfasser:	KNOP, REINHARD, FATHKE, VOLKER
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 SPRAYING OR ATOMISING IN GENERAL TRANSPORTING
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Beschreibung
Zusammenfassung:	In the two-sided coating of a web by feeding the web through the nip of a pair of pressing rolls onto which the coating substance is metered, the amount of the coating substance applied to each pressing roll is measured by infrared absorption and the relative coating quantities RWo onto the upper side and RWu to the underside are calculated by the relations RWo=M2o/(M2o+M2u) and RWu=M2u/(M2o+M2u); and where M2o represents an infrared absorption measurement of the coating on the roll applying the coating to the upper side and M2u represents the absorption measurement of the coating on the roll applying the substance to the underside of the web.