PAPERMAKING: Polyvinyl alcohol as foaming agent in foam formed paper

摘要

This work investigated the use of polyvinyl alcohol(PVOH or PVA)as a foaming agent in foam formed paper.Polyvinyl alcohol is a linear,nonionic water-soluble polymer.It has hydrophobic and hydrophilic parts that give it a surface-active character.PVOH is mainly characterized by degree of hydrolysis and molar mass.Degree of hydrolysis is given as mol-% hydroxyl groups on the polymer.Molar mass is measured indirectly by measuring the viscosity of a 4 percent PVOH solution.