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AssigneeSlovenska vysoka skola technicka
InventorsMichal Skrabak, Ernest Vavrik, Stanislav Kolarik, Milos Mazak
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A technique for forming single or multi-layer sheets of fibrous material having a controllable fiber distribution is described. A pair of spraying rollers each having a system of circumferentially spaced radial vanes on its surface are supported within the upper portion of a working zone defined between a pair of continually advancing, downwardly converging sieves that are disposed symmetrical to a longitudinal axis. The rollers are rotated in respectively opposite directions to intercept at least one fibrous suspension downwardly directed into the working zone, and to thereafter propel the intercepted liquid outwardly and downwardly toward the sides of the working zone in symmetrical fashion. The fibrous layers thus built up on the advancing sieves converge into the final sheet in the lower portion of the working zone. Separate facilities are associated with the upper and lower portions of the working zone for drawing liquid from the formed layers outwardly through the sieves.
In a method of forming a sheet of fibrous material, comprising the steps of advancing a pair of sieves in a downwardly converging manner symmetrical to a longitudinal axis to bound a wedge-shaped working zone between respective inner surfaces thereof, and introducing a fibrous suspension having a liquid phase into the working zone to be formed into a sheet and simultaneously dried via the passage of the liquid phase through the sieves, the improvement wherein the introducing step comprises directing the suspension into a central area of the working zone, and wherein the method further comprises the steps of supporting, in the upper portion of the working zone, a pair of transversely spaced spraying rollers symmetrical to the longitudinal axis and in intercepting relation to the suspension directed into the central area, each roller having a plurality of vanes extending outwardly from the periphery thereof, and rotating the rollers in mutually opposite directions to propel the intercepted suspension in directions symmetrical to the longitudinal axis toward the converging surfaces of the working zone, whereby a uniform, controllable fiber distribution is obtained.
In an apparatus for forming a sheet of fibrous material, comprising a pair of elongated sieves supported for movement in a downwardly converging manner in symmetrical relation to a longitudinal axis to define a wedge-shaped working zone between respective inner surfaces thereof, and means communicating with the upper portion of the working zone for introducing at least one fibrous suspension having a liquid phase into the working zone, the improvement which comprises a pair of transversely spaced spraying rollers supported for rotation in mutually opposite directions symmetrical to the longitudinal axis in the upper portion of the working zone, each of the rollers having a plurality of vanes extending radially outwardly from the periphery thereof for intercepting suspension downwardly introduced into the working zone by the introducing means and for propelling the intercepted suspension in directions symmetrical to the longitudinal axis toward the converging surfaces of the working zone, and means for rotating the rollers.
Dependencies are inferred from the claim text.