Metso Paper Inc.

Other

Juha S Kinnunen

Mari Taipale

Pasi Ahonen

Kari Holopainen

Juha Lipponen

Jyrki Huovila

Ari Puurtinen

Pekka Pakarinen

Hannu Korhonen

Pentti Rautiainen

Johan Grön

Sami Anttilainen

Pirkko-Leena Aarnikoivu

Johan Gr&ouml;n

Ari Linsuri

Petri Nyberg

A method and assembly is disclosed for manufacturing a sized web of paper or paperboard, the method comprising the steps of first forming the web at a headbox () from a stock comprising at least water and fiber, then pressing the web for water drainage, and finally drying the web by heating. Size furnish is added to the web so that at least a portion of the overall amount of size is added to the web prior to initiating the drying of the web by heating, and at least a portion of the overall amount of size is applied to the web after initiating the drying of the web.

Method and apparatus for producing sized paper of board

Water hydraulics are used in a paper or board machine, in particular in applications requiring lubrication and in the like in which an operating medium is subjected to pressure. A chemical which is used in the stock system (A) of the process is mixed with the water used in water hydraulics before the water is passed to a site of application ( ) in order to raise the viscosity of the water and chemical mixture to a level required by the site of application ( ). The water and chemical mixture is passed ( ) after that to the site of application ( ) and circulated through the same at least once, after which said water and chemical mixture is recovered ( ) and passed to the stock system (A) of the process as diluted to a suitable concentration.

Method for using water hydraulics in a paper or board machine

A method for manufacturing a paper or board web in which stock is fed from a headbox ( ) to a wire section ( ), in which water is removed from the web (W) and from which the web (W) is passed to a press section ( ), in which water is pressed out of the web (W) and after which the web (W) is dried in a dryer section ( ) and reeled by means of a reel-up ( ). 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.

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

The invention concerns a method for optimizing the degree of flocculation in a headbox. The degree of flocculation is measured continuously from a stock flow (M )/stock flows by means of a detector (R ) of flocculation, and the detector (R ) transmits a signal to a regulator (H ), which regulates the metering of retention agent ( ) and/or fillers ( ) and/or auxiliary chemicals ( ) into the stock flow (M )/stock flows continuously on the basis of the signal to an optimal level, which stock flow/flows is/are passed into the headbox (P ).

Method for optimizing the degree of flocculation

A multi-layer headbox for a paper or board machine including stock inlet headers each providing one stock and coupled to a tube bank which in turn is coupled to a respective intermediate chamber. The stock flows from the intermediate chambers into a turbulence generator and through pipes in the turbulence generator into a slice cone to be discharged therefrom onto a forming wire. The multi-layer headbox includes distribution valves for regulating the flow of dilution water across the width of the headbox. Each distribution valve communicates with a distribution plate placed in connection with the tube bank. From each valve, the dilution liquid is distributed at the same time to all the stocks that form the different layers of the web in the multi-layer headbox at a specific position of width of the multi-layer headbox.

Multi-layer headbox for a paper/board machine

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.

Method for manufacture of paper and a paper machine

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Jyväskylä, Finland

Juha S Kinnunen