US 5,087,400 AGranted

Process for making a product serving as a cultivation support

AssigneeWogegal S.A.

InventorChristian Theuveny

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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.

Claims14

Dependent claims

A process for making a composite product obtained by grinding wood chips or other lignocellulosic raw material, comprising the steps of:

passing the material through a machine, said machine comprising at least two screws driven in rotation inside a barrel which encloses them and provided with flights of various pitches;
regulating the conveying characteristics of said material so as to produce a controlled degree of grinding to obtain, at the outlet of the machine, a mixture based on isolated fibers and agglomerated bundles of fibers of various lengths and particle sizes;
introducing an adhesive binder into the barrel during the grinding at a rate regulated as a function of the conveying conditions of the material so that the adhesive is distributed in the mixture of fibers;
and
delaying curing of the adhesive binder by controlling the temperature of the material so that curing takes place only after leaving the machine.

2 more elements

Dependencies are inferred from the claim text.