Fiber preparation system
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorPaul Buchholzer
Life of this patent
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Abstract
The invention relates to a system for producing and preparing fibers. The system provides a first separator that is connected downstream of a tubular dryer, a fiber outlet of said separator being connected to a second separator by a connecting conduit. A size application device (9), formed by a section of conduit containing an internal tube (14) that is provided with air passages (13) and has a greater flow cross-section than the connecting conduit, is integrated into said connecting conduit. The internal tube is surrounded by an external tube (15), which together with the internal tube defines an annular chamber that has at least one compressed air connection (20).
Claims10
A system for the production and preparation of fibers prior to their hot-pressing to form fiberboards, comprising a refiner (1) for the milling of, chips to form fibers which then pass by steam or air pressure through a blow line (2), a tubular dryer (3), a first separator (4), a sizing device (9) and a second separator (6) into a fiber bunker preceding a spreading machine or directly into a spreading machine, the sizing device (9) being integrated into a connecting pipeline (5) to the second separator (6) and comprising a size wetting zone (12) which extends over a portion of this connecting pipeline (5) and comprises an inner pipe (14) which is provided with air passage orifices (13) and has size nozzles (23) projecting into it and a flow cross section enlarged in relation to the connecting pipeline (5) and which is surrounded by an outer pipe (15) which, with the inner pipe (14), encloses an interspace having at least one air connection, characterized by the following features:
- a) a fiber outlet of the first separator (4) is connected to the second separator (6) via said connecting pipeline (5), into which a blower (7) is connected upstream of the sizing device (9);
- b) the inner pipe (14) is designed cylindrically, the increase in its flow cross section taking place upstream of the size wetting zone (12) and a reduction in its flow cross section taking place downstream of the size wetting zone (12) from and to the initial diameter of the connecting pipeline (5) respectively, in each case via an annular cone (16, 17);
- c) an upstream annular cone (16), which, like a downstream annular cone (17), is provided with air passage orifices (13), is surrounded by a ring (22) with controlled automatic injection devices, the size nozzles (23) of which project through the upstream annular cone (16) into the inner pipe (14);
- d) the outer pipe (15) concentrically surrounds the inner pipe (14) and with the latter defines an annular space (18) which is sealed off at its two ends and which has at least one compressed-air connection (20), from which compressed air is fed into the annular space (18) via annular compressed-air distributors (19) concentrically surrounding the outer pipe (15);
- e) the air passage orifices (13) of the inner pipe (14) have a diameter of about 0.1–0.5 mm.
Dependencies are inferred from the claim text.