This subclass does not cover treatment of compositions which are in a plastic state, or worked by the same type of process or apparatus as plastics, which is covered by subclass Fulltext... Hierarchy... Expanded...B29B or C. [4]
Manufacture of substantially flat articles, e.g. boards, from particles or fibres [4]
B27N 3/02
·
from particles [4]
B27N 3/04
·
from fibres [4]
B27N 3/06
·
Making particle boards or fibreboards, with preformed covering layers, the particles or fibres being compressed with the layers to a board in one single pressing operation [4]