Plastic article or earthenware shaping or treating: apparatus – Air felting type shaping means – Means forming running length product
Reexamination Certificate
1999-11-01
2001-09-04
Nguyen, Nam (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Air felting type shaping means
Means forming running length product
C425S216000
Reexamination Certificate
active
06283741
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to apparatus for spreading and distributing particles on a material web, such as glue-coated wood fibers on a wire or a conveying belt for production of wood-fiber boards.
BACKGROUND OF THE INVENTION
In a forming station for producing wood-fiber boards there is currently a need to distribute glue-coated wood fibers on a wire or a conveying belt to form a layer with a certain thickness. The layer of wood fibers is transported by the wire or conveying belt to a pressing plant, in which the wood fibers, under the influence of pressure and temperature, are pressed together into a continuous board.
As is shown in International Application No. PCT/SE95/01402, a device of the type described above is previously known, whose purpose is the leveling of the material web after air distribution of the particles. Another type of leveling or milling is disclosed in U.S. Pat. No. 5,496,570 and consists of a scraper or a planing device, which, for the method shown, cut off any excess of the wood fibers. A disadvantage with the known technique is that a large amount of wood fibers are recirculated to the process from the leveling or milling step, which. is unfavorable, since the quality deteriorates by wear.
U.S. Pat. No. 5,496,570 shows how a number of disc rollers are used for distributing wood fibers and for pulverizing possible clumps among the wood fibers. A similar device, for distributing wood fibers with the aid of disc rollers, is shown in Swedish Patent No. 436,627. A common element in both of these latter references is that the disc rollers are located above the level of the wood fibers and by utilizing successively different distances between the discs of the different disc rollers, one may achieve sorting and orientation of the wood fibers in several different layers. A disadvantage, however, is that the distribution is unsatisfactory across the material web.
An object of the present invention is to thus provide a homogenous layer of wood fibers, having a desired distribution over the width of the material web. Another object is to provide a distribution of the wood fibers, in such way that any considerable subsequent leveling or milling is thereby avoided.
SUMMARY OF THE INVENTION
In accordance with the present invention, this and other objects have now been realized by the discovery of apparatus for spreading and distributing particles onto a moving web of the particles carried by a moving belt and moving in a predetermined direction, the apparatus comprising a plurality of rotatable axles disposed transverse to the predetermined direction, each of the plurality of rotatable axles including a plurality of distributors rotatable with the corresponding plurality of rotatable axles and disposed generally obliquely with respect to the plurality of rotatable axles, each of the plurality of rotatable axles disposed at successively increasing heights from the moving web in the predetermined direction, whereby each of the plurality of distributors extends into the particles comprising the moving web and distributes the particles across the moving web. Preferably, the particles comprise glue-coated wood fibers for production of wood fiberboard.
In accordance with one embodiment of the apparatus of the present invention, the apparatus includes a common frame, each of the plurality of rotable axles being attached to the common frame, and the common frame being disposed at a predetermined angle with respect to the moving web, whereby each of the plurality of rotatable axles provides a layer of the particles having a predetermined thickness, the predetermined thickness being determined by the predetermined angle of the common frame. In a preferred embodiment, the common frame is adjustable in a direction transverse to the predetermined direction at a predetermined transverse angle, whereby the cross-sectional profile of the particles comprising the moving web can be altered by altering the predetermined transverse angle.
In accordance with another embodiment of the apparatus of the present invention, each of the plurality of rotatable axles is individually vertically adjustably attached to the common frame, whereby the predetermined thickness of each of the layers of the particles can be adjusted.
In accordance with another embodiment of the apparatus of the present invention, each of the plurality of rotatable axles is individually longitudinally adjustably attached to the common frame, whereby the distance between the plurality of rotatable axles can be altered so as to alter the angle between the plurality of rotatable axles and the distribution of the particles within the layers.
In accordance with another embodiment of the apparatus of the present invention, at least one of the plurality of distributors comprises an elliptical disk. Preferably, the elliptical disk includes at least one opening, whereby the particles can pass therethrough. In a preferred embodiment, the elliptical disk includes a plurality of the openings, and includes at least one spoke separating the plurality of openings. Preferably, the at least one spoke is shaped in a manner whereby the particles are transported by the at least one shaped spoke in a desired direction.
In accordance with one embodiment of the apparatus of the present invention, at least one of the distributors includes transport means disposed on the periphery thereof, whereby the particles are transported in a desired direction by the transport means. Preferably, the transport means comprises protrusions.
In accordance with another embodiment of the apparatus of the present invention, at least one of the distributors comprises an elliptical disk including at least one recess, the elliptical disk formed in a manner whereby the particles are transported in a desired direction thereby.
In accordance with another embodiment of the apparatus of the present invention, at least one of the distributors comprises an elliptical disk including corrugations, whereby the particles are transported in a desired direction thereby.
In accordance with another embodiment of the apparatus of the present invention, at least one of the distributors comprises a plurality of protruding members, whereby the particles are transported in a desired direction thereby. Preferably, the protruding members are disposed in the shape of an elliptical planar brush. In a preferred embodiment, the protruding members comprises a plurality of protruding pins.
These objects of the present invention are achieved with a device which is characterized in that several axles, with distributing means, are arranged successive after each other at an increasing height, and are arranged such that the distribution means extends down into the material web, whereas particles at each axle, by the rotation of the distribution means, will be spread across the material web.
IIn a preferred embodiment of the present invention, the axles are secured to a common frame, which is arranged at an angle against the material web such that several layers are formed above each other, whereby the thickness of these layers, and thus the thickness of the resulting material web, is defined by this angle.
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Gustavsson Lennart
Nilsson Lars
Lerner David Littenberg Krumholz & Mentlik LLP
Nguyen Nam
Nguyen Thu Khanh T.
Valmet Fibertech Aktiebolag
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