Method for making of paper, tissue, board or the like

摘要

The invention relates to a method for making of paper, tissue, board or the like by using recycled fiber material as a raw material. The method comprises following steps: pulping recycled paper, board or the like in a pulper and obtaining a pulp flow comprising (i) an aqueous phase and (ii) at least recycled fibers and starch having low molecular weight, which are dispersed in the aqueous phase; adding a coagulant agent to the pulp flow or to an aqueous process flow comprising starch having low molecular weight; allowing the coagulant agent to interact with the starch having low molecular weight and optionally forming aggregates; and adding at least one flocculating agent, after the addition of the coagulant agent, to any flow, which comprises interacted coagulant agent, and forming a treated flow with starch comprising agglomerate(s); retaining at least part of the said aggregates and/or the said agglomerates to the fibers or to a web, which is formed.

主权项

1. A method for making paper, tissue, or board by using recycled fibre material comprising low molecular weight starch as a raw material, the method comprising the following steps:
pulping the recycled fibre material in a pulper and obtaining a pulp flow comprising (i) an aqueous phase and (ii) at least recycled fibres and starch having low molecular weight, which are dispersed in the aqueous phase; adding a coagulant agent to the pulp flow or to an aqueous process flow comprising starch having low molecular weight; allowing the coagulant agent to interact with the starch having low molecular weight in the pulp flow or allowing the coagulant agent to interact with the starch having low molecular weight in the aqueous process flow and optionally forming aggregates; adding at least one flocculating agent, after the addition of the coagulant agent, to any flow, which comprises interacted coagulant agent, and forming a treated flow with starch comprising agglomerates; optionally combining the aqueous process flow, after the addition of the flocculating agent, with the pulp flow; and retaining at least part of the agglomerates and the optionally formed aggregates, where present, to the fibres or to a web, which is formed.