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FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE (manufacture of articles by dry processes B27N)
Definition statement
This subclass covers:

Manufacture of fibreboard and articles from cellulosic fibrous suspensions by wet methods, and fibreboard product obtained thereby.

References relevant to classification in this subclass
This subclass does not cover:

Manufacture by dry processes of articles made from particles or fibres consisting of wood other lignocellulosic material

Preparation of pulp compositions

Addition of chemical agents

Formation of fibrous webs

Informative references
Attention is drawn to the following places, which may be of interest for search:

Cellulosic materials in the methods for working plastic materials

B29K1/00, B29B, B29C, B29D

Making other paper articles than boxes, cartons, envelopes, bags and tubes

Making layered products not composed wholly of paper or cardboard

Building materials

Special rules of classification within this subclass

Subgroups and head groups.

If a document concerns embodiments which are covered by several subgroups dependent on a higher hierarchy group, the following rules apply:

the specific technical information relevant for some of the subgroups is classified in all said subgroups;

if relevant, the structural association (e.g. the combination) of the elements covered by the subgroups is classified in the head group;

analogously, if generic technical information common to all of the subgroups is disclosed and only schematic embodiments of the specific subgroup embodiments are represented, the documents is classified in the head group only.

Fibreboard (preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F)
Definition statement
This group covers:

Processes and devices for the production of wet-formed board from raw materials comprising fibrous materials and optionally all kind of other filler material.

Special fibreboard
Definition statement
This subgroup covers:

Fibreboard specially adapted for a certain purpose.

Insulating board
Definition statement
This subgroup covers:

e.g. acoustic or thermal insulating board.

Manufacture of articles by pressing wet fibre pulp, or papier-mâchè, between moulds
Definition statement
This group covers:

Fibreboard manufacturing processes without the use of vacuum, i.e. only pressing the moulds together.

Manufacture of hollow articles by transferring sheets, produced from fibre suspensions or papier-mâchè by suction on wire-net moulds, to couch-moulds
Definition statement
This group covers:

Fibreboard manufacturing processes comprising sheet forming and subsequent moulding/pressing.

Manufacture of hollow articles from fibre suspensions or papier-mâchè by deposition of fibres in or on a wire-net mould
Definition statement
This group covers:

Fibreboard manufacturing processes comprising simultaneous forming and moulding.

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Last Modified: 10/11/2013