Metso Paper Inc.

Pirkko-Leena Aarnikoivu

Pasi Ahonen

Juha S Kinnunen

Mari Taipale

The invention concerns a method for manufacture of paper, most appropriately for porous paper for color powder printing. In the method paper is manufactured by means of a paper machine. In the method the paper stock is fed out of the headbox ( ) into the wire part ( ), in which wire part ( ) water is drained out of the paper web in both directions. In the method the paper web (W) is passed from the wire part ( ) into the press section ( ) in order to press water out of the paper web (W), and after the press section ( ), the paper web (W) is dried in the dryer section ( ) and coated/pigmented in the coating section ( ), dried in an after-dryer section ( ) and calendered in a calender ( ), and reeled in a reel-up ( ). The paper web (W) is made of layers in the Z-direction so that the desired distributions of additives and fillers are obtained in the different layers in the Z-direction of the paper web (W), and the paper web (W) is calendered in at least one calendering nip, which maintains or at least substantially retains the porosity of the web preceding the calendering. The invention also concerns a paper machine, most appropriately for manufacture of glossy and porous paper for color powder based printing. The paper machine comprises a headbox ( ), a wire part ( ), a press section ( ), a dryer section ( ), a coating section ( ), an after-dryer section ( ), a calender ( ), and a reel-up ( ). The headbox ( ) and the wire part ( ) have been formed so that the desired layers with different compositions in the Z-direction are provided in the paper, and the calender ( ) is a calender device that maintains or at least substantially retains the porosity of the paper web (W) preceding the calendering.

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Jyväskylä, Finland

Pirkko-Leena Aarnikoivu