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Paper is a thin material produced by pressing together moist fibres of cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets.It is a versatile material with many uses, including writing, printing, packaging, cleaning, decorating, and a number of industrial and construction processes.
In the groundwood process, debarked logs are fed into grinders where they are pressed against rotating stones to be made into fibres.
The pulp paper-making process is ascribed to Cai Lun, a 2nd-century CE Han court eunuch.
In the 19th century, industrialization greatly reduced the cost of manufacturing paper.
Coated papers are divided into matte, semi-matte or silk, and gloss.
Gloss papers give the highest optical density in the printed image.