Agitating – Stationary deflector in flow-through mixing chamber
Patent
1998-06-29
2000-08-22
Soohoo, Tony G.
Agitating
Stationary deflector in flow-through mixing chamber
366338, 366340, 366341, B01F 500
Patent
active
061061468
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method and to a device for mixing and/or thermal homogenization of at least one fluid.
The most varied methods for mixing and/or thermal homogenization of free-flowing fluids of plastics and/or natural materials are already known. In such a method and in a tool fitted for this purpose, according to DE 41 40 146 A1, guide devices are disposed in the flow and/or distributing duct of an extruding tool, said guide devices being distributed via a duct wall at least in individual cross-sectional areas and being spaced apart from one another. These guide devices project via one of the duct walls in the direction of the duct wall opposite it, and thus lead to a reduction in the duct cross-section. In this way it is intended to achieve a good mixture of the melted plastics waste or of the melt in the surface area of the mold sections, or a controlled deflection of portions of the plastic melt in the direction of the middle layer of the molded part to be produced. The deflection of portions of the plastic melt out of the surface areas into the middle layer was satisfactorily accomplished, yet the homogenization of the free-flowing fluid of plastic and/or natural materials achieved with such tools or devices, was adequate only for a proportion of the cases of application.
The object underlying the present invention is to provide a method and a device by means of which at least one free-flowing fluid can be uniformly mixed and homogenised.
A further device in the form of a static mixer for intermixing the most varied flowable media has become known from DE 26 42 105 A1, in which, in a plurality of planes extending parallel to one another and spaced apart from one another, the fluid is distributed into individual partial flows, and these partial flows are offset to one another in transverse planes succeeding one another in the flow direction. Due to the offset arrangement of individual raised portions and flow ducts located therebetween and extending parallel to one another, the fluid is divided into individual partial flows which, due to this offset arrangement, are offset transversely to one another in the successive transverse planes. Because of this arrangement of the raised portions and flow ducts, in the area of each raised portion there is only a lateral flow around the individual raised portions, so that the fluid is divided within the mixer into individual partial flows. Due to the arrangement one above the other of a plurality of plate members, and the arrangement of apertures between the individual flow ducts aligned parallel in the vertical direction, and located in planes spaced apart from one another, in these areas a specific passage or mixing of the individual partial flows can be effected from one plane to the other. Due to the division of the fluid into individual partial flows separated from one another, a new connection procedure of the individual partial flows is again required after passage through the mixer, and the disadvantageous unification of the converging skeins in the contact area must be guaranteed along flow lines, so that uniform homogenization of the free-flowing fluid has not been achievable in all cases of application.
This object of the invention is achieved by procedure is which the layer of free-flowing fluid remains cohesive and unitary over the entire duration of the mixing or thermal homogenization, so that a division into melt skeins and reconnection or unification to a continuous molded part by welding of the skeins coming together in the contact area along flow lines, is avoided. By virtue of the fact however that this continuous cohesive layer is spatially deformed in partial areas extending in parallel in the successive planes in the flow direction, vertical thereto, and are passed over varying lengths of flow paths in individually succeeding longitudinal sections, there is a build-up of spatial laminar flows, which move relative to one another both in layers, i.e. vertically to the layer being mixed, and also in a direction parallel to the flow
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Franz Purstinger
Langecker Gunter R.
C.A. Greiner & Sohne Gesellschaft m.b.H.
Soohoo Tony G.
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