Plastic article or earthenware shaping or treating: apparatus – Air felting type shaping means – Means forming running length product
Patent
1997-07-24
1999-01-05
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Air felting type shaping means
Means forming running length product
425216, B28B 502
Patent
active
058559230
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns a device for levelling a particulate material web, such as a wood-fibre mat laid out on a wire and intended for the production of wood-fibre boards, said material web being moved in relation to the device.
2. Description of Background Art
In the production of wood-fibre boards, glue-coated wood fibres are pneumatically conveyed from a container to a forming station. In this station, the wood fibres are laid out in the form of a mat on a wire, by means of which the fibres are conveyed to a pressing plant, where they are pressed into fibre boards under given pressure and temperature conditions. On its way to the pressing plant, the fibre mat passes a milling roller which is arranged transversely of the direction of conveyance and which mills the fibre mat to give it a smooth upper surface as well as a suitable thickness and a suitable weight before the pressing operation. The fibres removed from the fibre mat in the milling operation are recycled to the container, so as to subsequently be returned to the forming station and be laid out on the wire. The amount of wood fibres separated by the milling roller is fairly large and may, in some applications, be up to 25%. Since the amount of fibres separated and thus recirculated is fairly large, the fibres are worn and dehydrated to a disproportionate extent. Furthermore, the glue consumption and the power requirement of the fibre conveyance become excessive.
SUMMARY OF THE INVENTION
The object of this invention is, therefore, to provide a levelling device complementing the prior-art milling roller, thereby to considerably reduce the amount of fibres separated and recirculated.
According to the invention, this object is achieved by a device which is of the type mentioned by way of introduction and which is characterised by a rotary shaft, which is adapted to be arranged transversely of the direction of movement of the material web and on which a plurality of elliptic discs, through the centres of which extends the shaft, are mounted at an axial distance from one another so as to rotate with the shaft, the discs being so inclined about their minor axes in relation to the shaft as to have a circular axial projection.
In a preferred embodiment, the discs are mounted at such an axial distance from one another that adjoining discs overlap in the axial direction.
Conveniently, the discs are inclined at an angle of 45.degree.-80.degree., preferably about 60.degree..
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The invention will now be described in more detail with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is a side view of a device according to the invention, and
FIG. 2 is a schematic perspective view illustrating in more detail the geometric relationships of the component parts of the device.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Thus, FIG. 1 shows a levelling device 1 according to the invention, which is mounted above a wire 2 on which is laid out a material web 3 in the form of a wood-fibre mat. The material web 3 passes the device 1 on its way from a forming station (not shown) to a pressing plant (not shown) for the production of fibre boards.
The device 1 comprises a shaft 4, which has a circular cross-section and extends transversely of the direction of conveyance
REFERENCES:
patent: 979547 (1910-12-01), Norton
patent: 3067456 (1962-11-01), Himmelheber et al.
patent: 4167378 (1979-09-01), Hagg et al.
patent: 4998869 (1991-03-01), Kessing et al.
patent: 5013229 (1991-05-01), Ufermann et al.
ABB Flakt AB
Davis Robert
LandOfFree
Device for levelling a particulate material web does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for levelling a particulate material web, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for levelling a particulate material web will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-859908