Patent · US Active

System and method for manufacture of paper, board or the like

US10767315B2 · kind B2 · utility

0Cited by

1References

24Claims

0Family size

Assignee

KEMIRA OYJ · FI

Inventors

Matti Hietaniemi · Espoo, FI
Asko Karppi · Turku, FI

Key dates

Filing date	Mar 22, 2017
Grant date	Sep 8, 2020
Priority date	—
Expiry date	Aug 20, 2037

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02W30/64
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Drainage and press dewatering system for manufacture of paper, board or the like, comprising (a) amphoteric polyacrylamide, which is a copolymer obtained by polymerizing (meth)acrylamide and 1-80 mol-% of cationic monomers and/or 0.1-70 mol-% of anionic monomers, the polyacrylamide having an intrinsic viscosity in the range of 6-38 dl/g, (b) inorganic microparticles of siliceous material, such as colloidal silica or bentonite, and (c) a high-charged cationic coagulant having a charge density over 5 meq/g and preferably over 6 meq/g determined at pH 6 and selected from aluminium based coagulants, organic polymers and mixtures thereof.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.