THE EFFECT OF BASE SHEET PROPERTIES AND WET END CHEMISTRY ON SURFACE-SIZED PAPER

摘要

Base paper and its components can have a large effect on finished sheet properties such as porosity and water or solvent holdout. This is a result of interactions between the base paper's components with surface additives such as starch, additives that induce water repellency or polysaccharides such as sodium alginate. Base paper formation and porosity can have a dramatic effect on the performance of surface starches, especially hydrophobic starch esters. This can result in significant improvements in final sheet porosity, leading not only to more cost-effective porosity reduction , but to paper grades having improved print quality or oil and grease resistance. In addition to base sheet properties, wet end additives can have a marked effect on surface starch performance. Changes in internal sizing, filler level and other functional properties can greatly affect the film-forming ability of specialty surface starches.