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:
Apr. 29, 2014
Filed:
May. 25, 2012
Applicants:
Yulin Zhao, Shanghai, CN;
Jun LI, Shanghai, CN;
Qing Long Rao, Shanghai, CN;
Weiguo Cheng, Naperville, IL (US);
Inventors:
Yulin Zhao, Shanghai, CN;
Jun Li, Shanghai, CN;
Qing Long Rao, Shanghai, CN;
Weiguo Cheng, Naperville, IL (US);
Assignee:
Nalco Company, Naperville, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention provides a method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in a papermaking process. The method improves the efficiency of dewatering aid by coating at least some of the filler particles with a material that prevents the filler materials form adhering to dewatering aids. The dewatering aid holds the paper fibers together tightly and is not wasted on the filler particles.