Abstract: Process and installation for making a composite product, obtained by removing the fibre from wood chippings or other cellulose raw material, especially for above-ground cultivation purposes. The chippings (3) are place in a two-screw (2) fibre-removing machine (1), the overall characteristics being adjusted in such a way as to obtain, at the outlet of the machine (1), a mixture (31) based on isolated fibres and agglomerated bunches of fibres, of varying lengths and grain dimensions. An adhesive binder is inserted at a set feed-rate in the sleeve (11) during fibre removal so that it spreads through the fibre mixture in a discontinuous manner. By controlling the temperature the hardening of the binder can be delayed until the product emerges from the machine (1). Also covered is the product obtained in the form of a rigid block inserted in a sealed jacket.