US 6,712,931 B1Granted

Method for manufacturing a paper or board web and a paper or board machine

AssigneeMetso Paper, Inc.

InventorsJohan Grön, Pasi Ahonen, Juha Kinnunen, Pentti Rautiainen, Mari Taipale

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Abstract

A method for manufacturing a paper or board web in which stock is fed from a headbox (100) to a wire section (200), in which water is removed from the web (W) and from which the web (W) is passed to a press section (300), in which water is pressed out of the web (W) and after which the web (W) is dried in a dryer section (400) and reeled by means of a reel-up (800). According to the invention, additives, fillers and/or fines are fed into the stock of the surface layers of the web (W) in order to reduce the pore size distribution of the web in the surface layers so as to substantially correspond to a precoated web. The invention also relates to a paper or board machine which is characterized in that it is structured for enabling the feeding of additives, fillers and/or fines into a fiber stock such that an uncoated web substantially corresponds in its properties to a precoated web.

Claims11

Dependent claims

A method for manufacturing a coated paper or board web comprising the steps of:

providing a multi-layer headbox in which a stock is separated into a plurality of different stock flows, at least one of said plurality of different stock flows being a surface layer stock flow;
feeding into said surface layer stock flow stock additives, fillets and/or fines for reducing the pore size distribution of the paper or board web in the surface layers of the web;
feeding the plurality of stock flows, including said surface stock flow, from said multi-layer hand box to a wire section in which water is removed from the web;
feeding the web from the wire section to a press section to press water out of the web;
drying the web in a dryer section so that after said dryer section the web has a pore size distribution corresponding to that of a precoated web;
transferring the web to a coating station after said drying section where the web is coated;
and
reeling the web by means of a reel-up.

5 more elements

Dependencies are inferred from the claim text.