WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

D21J　FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE (manufacture of articles by dry processes B27N)

D21J 1/00 Fibreboard (preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F)

D21J 1/02 ・Cutting, e.g. using wet saws

D21J 1/04 ・Pressing

D21J 1/06 ・Drying

D21J 1/08 ・Impregnated or coated fibreboard

D21J 1/10 ・After-treatment

D21J 1/12 ・・Hardening

D21J 1/14 ・・Conditioning

D21J 1/16 ・Special fibreboard

D21J 1/165 ・・{Roofing material}

D21J 1/18 ・・Hardboard

D21J 1/20 ・・Insulating board

D21J 3/00 Manufacture of articles by pressing wet fibre pulp, or papier-mache, between moulds

D21J 3/02 ・of rings

D21J 3/04 ・of tubes

D21J 3/06 ・of stoppers

D21J 3/08 ・of bobbins

D21J 3/10 ・of hollow bodies

D21J 3/12 ・of sheets; of diaphragms

D21J 5/00 Manufacture of hollow articles by transferring sheets, produced from fibre suspensions or papier-mache by suction on wire-net moulds, to couch-moulds

D21J 7/00 Manufacture of hollow articles from fibre suspensions or papier-mache by deposition of fibres in or on a wire-net mould