公开(公告)号：US20240093433A1

公开(公告)日：2024-03-21

申请号：US18039654

申请日：2021-12-01

申请人： KEMIRA OYJ

发明人： Matti HIETANIEMI ,  Asko KARPPI ,  Markus KORHONEN ,  Markus KVIST

IPC分类号： D21H21/18 ,  D21H11/14 ,  D21H17/00 ,  D21H17/26 ,  D21H17/29 ,  D21H17/43 ,  D21H17/45 ,  D21H23/04 ,  D21H27/00

CPC分类号： D21H21/18 ,  D21H11/14 ,  D21H17/26 ,  D21H17/29 ,  D21H17/43 ,  D21H17/455 ,  D21H17/72 ,  D21H23/04 ,  D21H27/00

摘要： The invention relates to a chemical treatment system for manufacture of paper, board or the like and to a method employing it. The system comprises a first component, which is a glyoxylated polyacrylamide having a net cationic charge density and obtained by glyoxylation of a cationic polyacrylamide base polymer having a weight average molecular weight MW in a range of 30 000-500 000 g/mol. The system further comprises a second component, which comprises a mixture of at least a high-amylopectin starch, and an anionic first polymer, which has a weight average molecular weight MW>200 000 g/mol. The second component has a net cationic charge density in a range from 0.05 meq/g to 0.9 meq/g, when measured at pH 2.8, and a net anionic charge density in a range from −2 meq/g to −0.1 meq/g, when measured at pH 7.

公开(公告)号：US20240328089A1

公开(公告)日：2024-10-03

申请号：US18684348

申请日：2022-10-12

申请人： KEMIRA OYJ

发明人： Jonni AHLGREN ,  Matti HIETANIEMI ,  Markus KORHONEN

IPC分类号： D21H17/45 ,  D21D99/00 ,  D21H11/14 ,  D21H21/06 ,  D21H23/14

CPC分类号： D21H17/455 ,  D21D99/00 ,  D21H11/14 ,  D21H21/06 ,  D21H23/14

摘要： The invention relates to a method for reducing starch content of an aqueous phase, which is removed from a fibre stock preparation in a manufacturing process of paper, board, tissue or the like. The fibre stock preparation comprises a thickening step, where a fibre stock comprising cellulosic fibres originating from recycled fibre material and/or broke as well as starch dispersed in an aqueous phase is thickened from a first concentration to a second concentration by removing a part of the aqueous phase from the fibre stock. A cationic polymer obtained by copolymerisation of (meth)acrylamide and at least 25 mol-% of solely cationic monomer(s), having a standard viscosity SV of at least 1.7 mPas, is added to the fibre stock at the latest at the thickening step in order to associate the starch with the cellulosic fibres of the fibre stock.

公开(公告)号：US20230220621A1

公开(公告)日：2023-07-13

申请号：US17996400

申请日：2021-04-20

申请人： KEMIRA OYJ

发明人： Anu JAAKKOLA ,  Jaakko EKMAN ,  Marko KOLARI ,  Markus KORHONEN

IPC分类号： D21C5/00 ,  D21C5/02 ,  D21C7/12 ,  D21H11/14 ,  D21H21/36 ,  D21H17/67 ,  D21H17/11 ,  D21H17/00

CPC分类号： D21C5/005 ,  D21C5/02 ,  D21C7/12 ,  D21H11/14 ,  D21H21/36 ,  D21H17/67 ,  D21H17/11 ,  D21H17/74

摘要： 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.

公开(公告)号：US20220306510A1

公开(公告)日：2022-09-29

申请号：US17619444

申请日：2019-06-24

申请人： KEMIRA OYJ

发明人： Joonas LIKANDER ,  Rosa CARCELLER ,  Suhua WU ,  Asko KARPPI ,  Markus KORHONEN ,  Matti HIETANIEMI

IPC分类号： C02F11/147 ,  C08F220/56 ,  C08F16/06

摘要： A polymeric structure, which is obtained by polymerisation of (meth) acrylamide and at least one charged monomer in a polymerisation medium comprising at least a first host polymer, which first host polymer comprises polyvinyl alcohol. The polymeric structure may be used in making of paper, board, tissue or the like as a strength agent, or in dewatering of sludge.