Patent ID: 6093282
Filing Date: 2000-07-25
Classification: D21C,Y02W

Abstract:
A method for recycling of old corrugated container stock comprising:a) subjecting said container stock to a flotation treatment process comprising the steps of:i) loading said stock and water into a flotation cell to form a stock concentrate, said stock concentrate comprising long fibers, fiber fines, and adhesive starches,(ii) aerating said stock concentrate to form a long fiber portion and a floated fines portion, said long fiber comprising said long fibers, and said floated fines portion comprising said fines and said adhesive starches,(iii) maintaining the temperature of said stock concentrate in the flotation cell within a constant range,(iv) separating said floated fines portion from said long fiber portion by removing said floated fines portion from said flotation cell;b) subjecting said floated fines portion to a polysaccharide hydrolase treatment process to hydrolyze said fines and said adhesive starches; andc) subjecting said long fibers to a refining process comprising the steps of:(i) placing said long fibers into a refiner,(ii) maintaining the temperature of said long fibers in the refiner within a constant range,(iii) treating said long fibers to make them more flexible.