EFFECT OF SIZE FORMULATION ON SIZABILITY AND DESIZABILITY OF SOME SOLUBLE SIZES

A study was made of a broad range of size formulations based on four d ifferent kinds of polyvinyl alcohols (PVAs), carboxymethyl cellulose ( CMC), carboxymethyl starch (CMS), and sodium polyacrylate (PA), as wel l as binary mixtures of PA with PVAs, CMC or CMS, CMC with PVA or CMS, and CMS with PVA. The effect of size formulation on the mechanical pr operties of the sized samples, film resolubility, and size removabilit y was investigated. It was found, for a given set of conditions, that: (a) sizing is accompanied by a significant improvement in the tensile strength along with a reduction in the elongation at break of sized s amples, irrespective of the used size; (b) both the solubility rate of size films and percent size removal of sized samples were increased b y raising the bath temperature, while they were decreased by raising t he drying temperature; and (c) the extent of improvement in tensile st rength, reduction in elongation at break, resolubility of size film, a nd size removability depends on the nature and composition of the size used.