D21J FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MÂCHÉ
Introduced: September 1968
Classification Context
- Section:
- TEXTILES; PAPER
- Class:
- PAPER-MAKING; PRODUCTION OF CELLULOSE
- Subclass:
- FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MÂCHÉ
Description
D21J covers the production of fibreboard and manufactured articles formed from cellulosic fibrous suspensions, including papier-mâché. This classification encompasses manufacturing processes such as wet-laying, pressing, drying, and bonding of cellulose fibers to create composite board materials or molded products. It includes technologies for controlling fiber distribution, density, and mechanical properties of the resulting boards and articles. Related processes in paper-making chemistry and pulp preparation are classified elsewhere in D21, while finished paper products themselves fall under different classifications.
Related Keywords
4 direct subcodes
Child Classifications
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- D21J 1/00 Fibreboard
- D21J 3/00 Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
- D21J 5/00 Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch moulds
- D21J 7/00 Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould
Top Applicants
Top 10 applicants by patent filingsfor class D21, 2013–2023, worldwide · Source: EPO PATSTAT
- VOITH PATENT DE 1,809
- STORA ENSO FI 1,467
- KEMIRA FI 1,086
- KIMBERLY-CLARK CORPORATION US 935
- VALMET TECHNOLOGIES FI 924
- VALMET SE 904
- P&G (PROCTER & GAMBLE COMPANY) US 862
- OJI HOLDINGS CORPORATION 696
- OMYA INTERNATIONAL CH 584
- SOUTH CHINA UNIVERSITY OF TECHNOLOGY 571