Paper for packing purposes, and a process for its manufacture
A paper for packing purposes, particularly for use in the manufacture of corrugated cardboard, is made from waste paper and afforded good strength and finish by a surface sizing with gelatinized starch from cereals and/or tubers and/or roots together with proteins contained in these materials after dispersion or solution. The sizing may consist of gelatinized starch and cereal proteins of a normal commercial wheat and, if required, a small addition of an oxidizing agent, e.g., ammonium persulphate. Fibrous material separated from the gelatinized starch may be added to the waste paper constituent.