Plastic article or earthenware shaping or treating: apparatus – Means making particulate material directly from liquid or...
Patent
1993-08-18
1995-01-03
Bushey, Charles S.
Plastic article or earthenware shaping or treating: apparatus
Means making particulate material directly from liquid or...
264 5, 425 74, 425 75, 425331, 425365, B29B 900
Patent
active
053781325
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to improvements in an apparatus for producing granules or pastilles from flowable material.
Such an apparatus is known from DE-PS 3,902,957. In this known apparatus, the flowable material is supplied to the pressing gap between a rotating hollow roll with internal toothing and an externally toothed extrusion roll in engagement with said internal toothing. From the respective teeth bottoms of the internal toothing of the hollow roll bores extend to the outer side thereof through which the material is extruded on engagement with the extrusion roll and deposited in the form of pastilles or granules on a cooling surface. The cooling surface is formed by a revolving cooling belt which moves past the lower region of the hollow roll. The portion of said hollow roll lying above a horizontal center plane of the hollow roll is covered by a heating jacket which permits an influencing of the temperature of the hollow roll.
On emergence of the material from the bores of the hollow roll and on deposition of the pastilles or granules on the cooling belt, in the processing of many materials waste gases are formed which in accordance with environmental protection regulations cannot be released uncontrolled in the environment.
The invention is based on the problem of providing an apparatus of the type mentioned at the beginning which with simple construction permits reliable collection of the waste gases forming in the processing of the materials.
This problem is solved by the features set forth in the following description and as illustrated in the accompanying drawings.
SUMMARY OF THE INVENTION
In the improved apparatus of this invention, flowable material is supplied to the pressing gap between a revolving hollow roll with internal toothing and an externally toothed extrusion roll in engagement with said internal toothing. Bores are provided which extend from the respective teeth bottoms of the internal toothing of the hollow roll to the outside thereof. On engagement with the extrusion roll, the flowable material is extruded through the bores and deposited in the form of pastilles or granules on a cooling surface. At least a portion of the outer periphery of the hollow roll remote from the cooling surface is surrounded by a heating jacket such that on the outer side of the heating jacket and spaced therefrom is a further jacket arranged in such a manner as to create a waste gas well therebetween. The waste gas well is formed so as to communicate with an extraction connection tube piece for channeling the gases emerging from the deposited flowable material as it cools.
With the configuration of the apparatus according to the invention, the waste gases are extracted directly in the region in which they are formed, i.e. in the region in which the material emerges from the bores of the hollow roll and is deposited on the cooling surface. Due to the fact that the waste gas well is partially defined by the outer surface of the heating jacket present in any case, a simple construction is obtained; the further jacket forming the other wall of the waste gas well and arranged on the outer side of the heating jacket simultaneously provides the insulation, otherwise also necessary, of the outer side of the heating jacket and itself may be insulated.
Due to the fact that the waste gas well is also heated by the outer side of the heating jacket, condensation of the collected gases in this region is reliably avoided and the waste gases pass via the waste gas well to an exhaust connection tube piece from whence the waste gases can be supplied to solvent recovery and/or filter means.
To enable the extraction effect of the waste gas well to be controlled, said waste gas well, preferably sealed at the end sides of the hollow roll, can be sealed at its rear end, seen in the direction of rotation and opposite the intake end for the waste gases, by an adjustable flap which permits control of the ambient air sucked in at this rear end.
Said flap is preferably articulately connected to the
REFERENCES:
patent: 2161356 (1939-06-01), Jewett
patent: 2201747 (1940-05-01), Staudt
patent: 2951262 (1960-09-01), Dorman et al.
patent: 3427683 (1969-02-01), Nazaruk et al.
patent: 5013498 (1991-05-01), Froeschke
patent: 5198233 (1993-03-01), Kaiser
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