公开(公告)号：CA2908642A1

公开(公告)日：2014-10-30

申请号：CA2908642

申请日：2014-04-25

Applicant: WETEND TECHNOLOGIES OY ,  STORA ENSO OYJ

Inventor： HEISKANEN ISTO ,  IMPPOLA OLAVI ,  MATULA JOUNI ,  MATULA JUSSI ,  RASANEN JARI ,  TAHKOLA KARRI ,  VAKEVAINEN MATTI

IPC: D21H17/30 ,  C01F11/02 ,  D21H17/00 ,  D21H17/67 ,  D21H17/70 ,  D21H21/10 ,  D21H21/18 ,  D21H23/04

Abstract: The present invention relates toa method of producing precipitated calcium carbonate (PCC) where a retention/strength enhancing chemical is added to milk of lime to form a mixture thereof prior to adding the mixture of the retention/strength enhancing chemical and milk of lime to paper making stock in a pipeline leading to a headbox of a paper making machine, whereafter carbon dioxide is introduced to the paper making stock, and the carbonation reaction between milk of lime and carbon dioxide is allowed to proceed in the presence of both fibres and the retention/strength enhancing chemical.