Abstract: Defiberized lignocellulosic material, such as wood, is treated with a liquid carrier containing an oxidizing agent (a per compound, a chlorate or a nitrate), and the wet mat thereof is subjected to pressure, and to heat for a sufficient period of time to cause an oxidative reaction among the fibers resulting in a strong interfiber bond. Where the oxidizing agent is a per compound, the pH of the mixture or lignocellulosic material and per compound is less than 7. Catalysts or other reaction modifying agents are employed if needed. By virtue of the enhanced interfiber bonding effect, paper sheets, such as liner board, which are usually formed of delignified cellulosic material, the fibers of which are highly refined, can be formed totally or partially of less expensive sources of material such as ground wood, semi-chemical or semi-mechanical lignocellulosic pulps without sacrifice of strength.

Abstract: Solid lignocellulosic material is bonded into a strong solid mass by treating with a liquid carrier containing an oxidant, and pressing under heat and pressure in a conventional unsealed press for a period of time sufficient to effect bonding by oxidation. Plywood formed of wood veneers is advantageously formed. Catalysts or other modifying agents may be employed with the oxidant.