Manufacture of fibreboard according to the wet method with...

Details Manufacture of fibreboard according to the wet method with... Manufacture of fibreboard according to the wet method with...

D - Textiles, Paper

21

J

9/61

D21J 1/00 (2006.01)

Patent

CA 1047708

ABSTRACT OF THE DISCLOSURE The present invention provides in the manufacture of fibreboard according to the wet method and with closed backwater system which includes in sequence: defibrating lignocellulose- containing material in at least one step, dispensing the defi- brated material in water serving as propellent liquid, forming wet sheets from the suspension, mechanical separating and re- cycling of the backwater to the suspension step and final drying by evaporation of water, the improvement that the entering ligno- cellulose-containing material prior to the suspension step is brought to a dry content exceeding the dry content of the wet sheet prior to said final drying, that formalin is admixed to the backwater and that the backwater is homogenized and possibly existing precipitations divided finely by effective agitation and dispergation before said backwater is utilized for suspen- sion of fresh entering fibrous material.

209053

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