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:
Jun. 07, 2005
Filed:
Nov. 03, 2003
Applicants:
Chang Shin Park, San Diego, CA (US);
Hanjian Xu, Middletown, NY (US);
Inventors:
Chang Shin Park, San Diego, CA (US);
Hanjian Xu, Middletown, NY (US);
Assignee:
International Paper Company, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21F001/00 ; D21F011/00 ;
U.S. Cl.
CPC ...
Abstract
The present invention provides a method making stratified paper by redistributing the pulp suspension inside the headbox nozzle using acoustic radiation waves. Acoustic radiation forces fractionate fibers based on fiber radius. The acoustic radiation waves separate the fibers by pushing the coarse and longer fibers to the inner area while fines and smaller fibers remain in the outer area. This has a similar effect of multi-layer stratification headbox, and provides paper with a smoother surface.