Commonly referred to as PAC, a series of polyhydroxide chlorides of aluminum with the general formula Aln(OH)mCl3n−m are being increasingly used as rosin size bonding agents, drainage aids and retention aids in papermaking.
The manufacturing route chosen, the process kinetics and degree of neutralization affect the product produced and its reactions in the paper-making system. Production methods and procedures for quantifying the products produced are described.
Dispersed rosin size and PAC can be applied to a papermaking system operating at pH 6 to 7.3.
Sizing specifications are met and paper with non-slip characteristics, good machine glaze surface and printability is produced.