Method for producing wood fibres for a culture substrate

Method for producing wood fibres for a culture substrate

According to the method, wood chips (16) are introduced into a sheath (10) containing two parallel, meshed screws (12, 14), their threads (12B, 14B) having, in succession, in the downstream direction (S), at least one upstream series and a downstream series of sections (SM, SI, SA) each series of se...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ERIC BEAUDET, JéRôME COWPER
Format: Patent
Sprache:eng
Schlagworte:
AGRICULTURE
ANIMAL HUSBANDRY
CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPSOR SEAWEED
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
FISHING
FORESTRY
HORTICULTURE
HUMAN NECESSITIES
HUNTING
PAPER-MAKING
PERFORMING OPERATIONS
PRESSES
PRESSES IN GENERAL
PRODUCTION OF CELLULOSE
TEXTILES
TRANSPORTING
TRAPPING
WATERING
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Beschreibung
Zusammenfassung:According to the method, wood chips (16) are introduced into a sheath (10) containing two parallel, meshed screws (12, 14), their threads (12B, 14B) having, in succession, in the downstream direction (S), at least one upstream series and a downstream series of sections (SM, SI, SA) each series of sections comprising a driving zone (SME, SIE, SAE) in which the chips are driven downstream and a braking zone (SMF, SIF, SAF) through which the chips are forced, the chips thus being driven through the sheath (10) while being slowed down in the braking zones and while being converted into fibres (24). The length of stay of the chips in the sheath (10) is between 15 and 80 seconds and the pressure upstream of the braking zone (SMF) of the upstream series (SM) is substantially equal to 90 bar, such that a temperature of between 120oC and 150oC is reached in the sheath (10) without an external supply of heat.