The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2017
Filed:
Apr. 25, 2014
Wetend Technologies Oy, Savonlinna, FI;
Stora Enso Oyj, Helsinki, FI;
Isto Heiskanen, Imatra, FI;
Olavi Imppola, Hyvinkaa, FI;
Jouni Matula, Savonlinna, FI;
Jussi Matula, Savonlinna, FI;
Jari Rasanen, Imatra, FI;
Karri Tahkola, Savonlinna, FI;
Matti Vakevainen, Imatra, FI;
Wetend Technologies Oy, Savonlinna, FI;
Stora Enso Oyj, Helsinki, FI;
Abstract
The present invention relates to a 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 fibers and the retention/strength enhancing chemical.