Paper Sizing Agent

There are two ways for paper sizing, one is in front of the sheet forming (beating or ingredients) add sizing agent in pulp called intracytoplasmic sizing, another is in sheet forming after coating on paper or cardboard surface is called the surface glue.The sizing agent of pulp is mainly rosin sizing agent, synthetic sizing agent, paraffin sizing agent and neutral sizing agent.Surface sizing agent and neutral sizing agent.Surface sizing is mainly to improve the smoothness of the surface of the paper, reduce the porosity and prevent the surface hair and hair loss.The more used is modified and unmodified starch, and the PVA is also used.Other products include paraffin emulsion, animal glue, carboxymethyl cellulose, polyurethane, styrene-maleic anhydride copolymer, acrylate copolymer, dihydroxy fatty acid compound, etc.