Plastic article or earthenware shaping or treating: apparatus – Means making particulate material directly from liquid or... – By slinger or rotating liquid comminutor
Patent
1996-03-12
1998-02-24
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means making particulate material directly from liquid or...
By slinger or rotating liquid comminutor
264 8, 264 9, 264 13, 425 3, 425 6, B29B 900
Patent
active
057209855
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to an apparatus for the manufacture of monodisperse tablets or spheres using a rigid frame, a tubular extruder arranged in it with outflow openings for the mass to be tableted and with an installation for production of periodic inertial forces effecting a shearing of the extruded mass streams.
Installations exist which produce droplets according to the principle mentioned above. These installations work in part with a randomness associated with hydrodynamics and a stream separation principle which does not facilitate exact control of the shearing moment nor, as a result, the dimensioning of the separated droplets.
From Swiss Patent 675370, a process and apparatus for the mass production of small, essentially spherical one or more-layered particles is known. In this known design, a nozzle head with many concentrically arranged nozzles is provided from which a central mass, a mass forming further layerings as well as a shell mass are fed. The streams exiting from the concentric nozzles are subjected to oscillations by a vibrator which lead to a periodic acceleration and delay of the exiting streams which then leads to a shearing into individual particles if the outer streams maintain a higher velocity. These particles are conveyed from the shell stream to a buffer medium which results in solidification of the particles and acts simultaneously to convey the solid parts outward.
Apparatuses of this design presume an exact control and dimensioning of the various mass streams. Minimal deviations in the stream relationships lead to non-monodisperse particles. The separation of the particles also depends on the adjusted flow relationships.
In contrast, the objective of the present invention is to provide an apparatus of the above mentioned type such that the separation of a stream results regardless of difficult flow relationships and indeed such that the moment of the separation can be determined in a relatively simple way.
SUMMARY OF THE INVENTION
It is suggested, to meet this objective in an apparatus of the above mentioned type, that the tubular extruder comprises a movable pipe held in the Same with holes arranged parallel to its axis, and that at least one agitator be provided as the equipment for production of the periodic inertial forces with which the pipe is periodically excited perpendicular to its axis, i.e. perpendicular to the stream direction of the mass, with a parallel shift. The pipe can also be excited to a periodic rotational movement within a small angle about an axis outside the pipe and parallel to a generatrix of the pipe.
The recognition that hydrodynamic flow with as little turbulence as possible is preferred over a flow which can be the site of eddies and segregation factors is the basis for this arrangement. The chosen form of the extruder head is then not immaterial and it has been shown that a laminar flow and a rapid circulation of the mass in the extruder head can be ensured with the invention. On (his basis, the apparatus according to the invention allows the mass within a pipe to circulate in rectilinear fashion at least at the level of the extruder nozzles. Further, it offers the advantage of simpler design, manufacture, installation and service. The nozzles are arranged lengthwise, i.e. along a generatrix of the pipe.
Three types of motion can be provided:
The first is not favorable from the standpoint of productivity, since the parabolic axis of dispersion intersects with those of the openings, and the hazard can then arise that the streams oppositely influence one another, if the nozzles do not have enough separation. The second is interesting since the parabolic axis runs vertically with respect to the axis of the openings, whereby the streams can never influence one another oppositely and many more openings can be provided per unit of length. The last is likewise satisfactory for the same reason. It poses problems insofar as the operating speed of the pipe (during rotation) bestows no total motion to the fluid as in a di
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patent: 5259593 (1993-11-01), Orme et al.
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Leyson Joseph
Santrade Ltd.
Woo Jay H.
LandOfFree
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