Installation for preparing wood fibers for a cultivation substrate
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United States of America Patent
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Jul 15, 2014
Grant Date -
Mar 28, 2013
app pub date -
Dec 19, 2011
filing date -
Sep 26, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
The installation comprises a defibration sheath with an inlet for wood chips, an outlet for fibers, and two parallel rotative screws. The screws mesh with each other via their respective threads, which have at least an upstream and a downstream series of segments, with a drive upstream zone having forward threads, and a braking downstream zone having reverse threads with notches that are smaller in the braking downstream zone of the downstream series than in the braking downstream zone of the upstream series. The number of notches per thread in each braking zone is 2 to 6, and the section-to-output ratio RSO of the sum of the sections of the notches of a thread of the braking downstream zone of the downstream series to the fiber output rate is 60 mm2/m3h−1 to 80 mm2/m3h−1.
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