Paper with improved stiffness and bulk and method for making same

摘要

The invention provides a three layered reprographic paper having improved strength, stiffness and curl resistance properties, and a method for making same. The paper has a central core layer made largely of cellulose and bulked with a bulking agent such as a diamide salt. A starch-based metered size press coating is pressed on both sides of the core layer, wherein the starch has a high solid content. The coating forms a three layered paper having an I-beam arrangement with high strength outer layers surrounding a low density core.

主权项

1. A paper or paperboard having improved bulk and stiffness comprising: a three layered single-ply I-beam structure having a higher density strengthened top layer, a lower density bulked central layer and a higher density strengthened bottom layer, wherein the central layer is a cellulosic core layer, and the top and bottom layers are strengthening starch based, size-press applied coating layers that cover an upper and lower surface of the central layer with minimal penetration into the central layer such that starch is substantially absent from the central layer, and a bulking agent interpenetrated within the central layer, and wherein the top and bottom layers are formed are from a high strength starch based size-press solution having from about 6 to about 12 wt % starch solids.