Patent ID: 6190729
Filing Date: 2001-02-20
Classification: B05C,D21H

Abstract:
A method for two-side coating of a printing paper web containing mechanical pulp or recycled fiber and having a base weight of less than 65 g/m.sup.2, comprising:applying a sufficient amount of a coating mix to only a first side of the web within a first coating station to coat the first side of the web, wherein the coating mix is pressed onto the first side of the web by applying the coating mix onto a perimeter of a first resilient film-coating roll rotated at a peripheral speed approximately equal to a speed in which the web travels and subsequently transferring the coating mix to the first side of the web in a first nip formed between a first backing roll and the first film-coating roll, the first backing roll and the first film-coating roll calendering the web;at least partially drying in a first dryer unit the coating mix applied to the first side of the web;applying a sufficient amount of the coating mix to only a second side of the web within a second coating station to coat the second side of the web, said step of applying coating mix to the second side of the web occurring subsequent to said step of at least partially drying of the coating mix applied to the first side of the web, wherein the coating mix is pressed onto the second side of the web by applying the coating mix onto a perimeter of a second resilient film-coating roll rotated at a peripheral speed approximately equal to a speed in which the web travels and subsequently transferring the coating mix to the second side of the web in a second nip formed between a second backing roll and the second film-coating roll, the second backing roll and the second film-coating roll calendering the web; andat least partially drying in a second dryer unit the coating mix applied to the second side of the web;wherein said steps of applying coating mix and at least partially drying of the applied coating mix are performed continuously in a coating apparatus.