Abstract: The present invention relates to the fields of fibers and uses thereof such as for producing fiber webs, such as paper, board or tissue. Specifically, the invention relates to a method of monitoring and controlling cellulolytic activity in an aqueous cellulose fiber suspension or process water for a production method of a fibrous web containing cellulose fibers. Also, the present invention relates to a method of manufacturing a fibrous web, such as a paper, board, tissue or the like, and use of a biocide for controlling cellulolytic activity in an aqueous cellulose fiber suspension or in process water e.g. for a production method of a fibrous web containing cellulose fibers. Still, the present invention relates to a fibrous web, such as a paper, board, tissue or the like, an aqueous cellulose fiber suspension or process water for a production method of a fibrous web containing cellulose fibers, and a system for controlling cellulolytic activity in an aqueous fiber suspension or in process water.

Abstract: A method includes forming an aqueous fibre suspension including cellulosic fibres from one or more raw material flows, and applying at least one chemical and/or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension is in the intermediate residence entity at least a minimum delay time. A final ORP value is measured for the aqueous fibre suspension after an outlet of the intermediate residence entity before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated. Finally, the aqueous fibre suspension is formed into a fibrous web and dried.

Abstract: The present invention relates to a process for manufacturing a fibre web, such as paper, board, tissue or the like. In the process bleached cellulose-containing fibres are suspended into process water in order to prepare a fibre stock, which comprises residual hydrogen peroxide. The process comprises at least one pulp storage tower through which the fibre stock is transferred before it is formed into a fibrous web and dried. Zinc ions are introduced to the fibre stock or one of its constituents to maintain the amount of residual hydrogen peroxide in the fibre stock at or above a predetermined threshold level after at least one pulp storage tower.

Abstract: The present invention relates to a microfibrillated cellulose composition comprising microfibrillated cellulose originating from agricultural biomass, comprising: ?30 wt % cellulose, 1-15 wt % pectin, 8-25 wt % hemicellulose, 0-12 wt %, lignin, 0-15 wt % ash, and 0-8 wt % protein, based on dry solids content of said microfibrillated cellulose; and a biocide composition comprising at least two biocidal components, wherein the at least two biocidal components are selected from the groups of biocidal components consisting of: Group I: compounds with activated halogen atoms, Group II: heterocyclic N—S compounds, Group III: aldehydes, and Group IV: surface active biocidal compounds selected from the group consisting of quaternary ammonium compounds, long-chain alkylamines, guanidines and biguanidines, and any combination thereof, and the at least two biocidal components are selected from at least two different groups.

Abstract: A method and apparatus for monitoring deposit formation in a process having an aqueous flow is provided. According to exemplary embodiments, a feed flow of an aqueous liquid is provided onto a receiving surface to be monitored. At least part of a receiving surface is illuminated with at least one light source. Visual data is collected across the receiving surface and analyzed. The quality and type of deposition attached to the receiving surface is classified based on information obtained from the analyzed visual data, and a quantitative scaling and/or fouling indication is computed based on the classification.

Abstract: A method for manufacture of paper, board or the like, comprising the step of dissolving a composition into aqueous solution, whereby an aqueous treatment solution is obtained for adding the obtained treatment solution to the pulp. The composition comprising a copolymer of acrylamide and at least one cationic monomer, the copolymer comprising cationic monomers at least 15 mol-%, calculated from total amount of monomers, and an ionic crosslinker agent comprising at least two carboxyl groups, wherein the equivalent ratio of carboxyl groups:cationic monomer is between 1:20 and 1:0.5.

Abstract: The invention relates to a method for treating starch in pulp, paper and board making processes, in which processes recycled fibre material is used as raw material wherein the recycled fibre material is pulped in a pulper and obtaining a pulp flow comprising an aqueous phase and at least recycled fibres and starch dispersed in the aqueous phase. The method comprising the following steps: —adding amylase enzyme inhibitor and/or at least one biocide to pulp flow or to an aqueous process flow comprising starch for preventing starch degradation, and—adding an amphoteric polymer obtained by copolymerisation of (meth)acrylamide with cationic and anionic monomers to pulp flow or to an aqueous process flow comprising starch for binding starch to the fibres.

Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Abstract: A method includes forming an aqueous fibre suspension including cellulosic fibres from one or more raw material flows, and applying at least one chemical and/or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension is in the intermediate residence entity at least a minimum delay time. A final ORP value is measured for the aqueous fibre suspension after an outlet of the said intermediate residence entity before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated. Finally, the aqueous fibre suspension is formed into a fibrous web and dried.

Abstract: The present invention provides a method for preventing or decreasing scale formation on process surfaces in manufacturing process of paper, board or the like, in which method performic acid is used as an antiscaling agent.

Abstract: A method for manufacture of paper, board or the like, comprising the step of dissolving a composition into aqueous solution, whereby an aqueous treatment solution is obtained for adding the obtained treatment solution to the pulp. The composition comprising a copolymer of acrylamide and at least one cationic monomer, the copolymer comprising cationic monomers at least 15 mol-%, calculated from total amount of monomers, and an ionic crosslinker agent comprising at least two carboxyl groups, wherein the equivalent ratio of carboxyl groups:cationic monomer is between 1:20 and 1:0.5.

Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Abstract: The invention relates to a method for treating starch in pulp, paper and board making processes, in which processes recycled fibre material is used as raw material wherein the recycled fibre material is pulped in a pulper and obtaining a pulp flow comprising an aqueous phase and at least recycled fibres and starch dispersed in the aqueous phase. The method comprising the following steps: —adding amylase enzyme inhibitor and/or at least one biocide to pulp flow or to an aqueous process flow comprising starch for preventing starch degradation, and—adding an amphoteric polymer obtained by copolymerisation of (meth)acrylamide with cationic and anionic monomers to pulp flow or to an aqueous process flow comprising starch for binding starch to the fibres.

Abstract: A method and apparatus for monitoring deposit formation in a process having an aqueous flow is provided. According to exemplary embodiments, a feed flow of an aqueous liquid is provided onto a receiving surface to be monitored. At least part of a receiving surface is illuminated with at least one light source. Visual data is collected across the receiving surface and analyzed. The quality and type of deposition attached to the receiving surface is classified based on information obtained from the analyzed visual data, and a quantitative scaling and/or fouling indication is computed based on the classification.

Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Abstract: The present invention provides a method for preventing or decreasing scale formation on process surfaces in manufacturing process of paper, board or the like, in which method performic acid is used as an antiscaling agent.

Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Abstract: 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.

Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Abstract: The invention relates to a method for making of paper, tissue, board or the like by using recycled fibre 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 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 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 fibres or to a web, which is formed.