Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With classifying – separating or screening of pulp
Patent
1987-07-06
1988-11-01
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With classifying, separating or screening of pulp
162129, 162130, D21F 1104, D21H 512
Patent
active
047817933
ABSTRACT:
Method in a paper manufacturing process for improving the properties of the paper, in particular its retention. In the method, the fibre material is passed through a refining and screening system to the head-box arrangement of a paper machine, which comprises one or several head boxes, through which the stock suspension is fed onto a forming wire or into a forming gap (G) between a pair of forming wires (40,41). Two different components are formed out of basic stock which contains substantially all the fibres to be used for the paper to be manufactured. Of these components, one component contains mainly fibres longer than the average distribution of fibre length in the basic stock, while the other stock component contains mainly fibres shorter than average and fines as well, in addition to a possible additive component or components for the stock, if any. The stock component of longer fibres is fed, by means of a multi-channel head box, into direct contact with the forming wire or wires (40,41). The stock component which contains shorter fibres and possibly also filler material, is fed by means of the head-box arrangement either, in the case of a twin-wire former, into the middle of the layer structure formed by the stock components with longer fibres, or, in the case of a single wire, such as a fourdrinier wire, onto the stock component with longer fibres which is in direct contact with the wire, to form a surface layer in the layer structure.
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Chin Peter
Hastings K. M.
Valmet Oy
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