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  • Optical brightener for paper industry are additives that paper industry put into paper in order to help a paper look "whiter." They are also called optical brightener agents (OBA), or sometimes "artificial whiteners." Many paper industry use optical brighteners in dry end at the size press or calender stack as surface coating.The optical brighteners that are used in paper industries can be sort into three types based on the sulfonic groups. All of them contain stilbene structure.

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