The Evolution of Strength Additives

摘要

1. OCC widely used in packaging grades 1.1 Reduce cost 1.2 "greener" 1.3 Strength can be a challenge 2. Many dry strength additives have been used since the 1950's 2.1 Most common now: starches, GPAm, PVAM 3. Enzyme Strength development products are latest development 3.1 Proven 3.1.1 Tissue, virgin and recycled 3.1.2 Speciality grades 3.1.3 100 % recycled board grades 4. New tool in the strength toolbox.