Deinking process invented by Justus Claproth in 1774 for removing printing inks. Before 1799, paper was made from recycled textile fibers. Wood pulp production became independent of recycled materials in 1843. Recycled paper production reached 42% of total production in 1997
Pulpwood is ground timber processed into fibrous pulp. Trees are categorized as hardwood or softwood based on their fibres. Hardwoods produce printing paper with small fibres. Softwoods create strong papers with long fibres
Woodchips are small pieces of wood made from trees, branches, and waste. Woodchipping is done using specialized machines called wood chippers. Raw materials include pulpwood, waste wood, and agricultural residues
Optical brighteners absorb UV/violet light and emit blue light through fluorescence. Stilbenes are the most common classes of compounds with this property. Approximately 400 brightener types exist, but only 90 are commercially produced. Stilbene derivatives fade under UV exposure and degrade in air
Pulp is fibrous material produced from wood, fibers, waste paper or rags. Ancient civilizations used unprocessed plant materials like papyrus. First papermaking in China around AD 105 using mulberry bast fibers
Asian-Pacific countries dominate global paper industry. China, India, South Korea, and Japan are major paper producers. Pulp and paper manufacturing sector maintains industry balance