Drying and gas or vapor contact with solids – Process – With fluid current conveying or suspension of treated material
Patent
1994-09-13
1996-05-07
Kwon, John T.
Drying and gas or vapor contact with solids
Process
With fluid current conveying or suspension of treated material
34363, 34582, 34592, F26B 308
Patent
active
055134459
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The subject of the invention is a method of operating a drier for at least one of powdered, granulated and pourable materials, and a drier operating in accordance with the method.
BACKGROUND OF THE INVENTION
Driers of this type are used, for example, preferably, in the plastics industry in order to dry granulates, as is necessary for the production of plastic bodies in blow-molding methods. It is known to pour the granulate to be dried into a funnel-shaped drier and conduct a current of drying air into the floor region of the drier, which current subsequently rises and removes the moisture from the granulate, and the dry air then escapes through a discharge opening on the top side.
The known drier is operated in circulating air operation. Accordingly, a current of dry compressed air is introduced into the line upstream of a fan, this compressed-air current expanding in the fan and being conducted upstream into the floor region of the drier through this fan via one or a plurality of outlet nozzles.
A disadvantage of the known method and the drier operating in accordance therewith is that a continuous compressed-air current must be made available, which is machine-intensive. This compressed-air current must be filtered, de-oiled and appropriately heated in order to achieve favorable conditioning of the drying air.
A further disadvantage is the relatively machine-intensive requirement for circulating the drying air in the drier in the circulating-air operation. Corresponding lines are necessary for this, as is a suitable fan, in order to assure a constant throughput in circulation through the drier.
A further disadvantage is that the compressed-air current, which is introduced upstream of the fan, cannot be guided and conditioned separately from the drying-air current.
Thus, the disadvantage arises that no separate air current can be fed into the drier, which is advantageous in many drying jobs.
Therefore, it is the object of the invention to modify a method and a drier operating in accordance with the method such that improved drying of the material to be dried is assured with low machine intensity.
SUMMARY OF THE INVENTION
The above object is accomplished by the invention, according to which a drying air current is drawn from the outlet of a plastic molding device, such as a blow-molding device, and thereafter introduced into a drier containing the material to be dried such that the drying air current passes through the material to be dried and removes moisture therefrom.
An essential feature of the invention is that the method according to the invention operates with a drying-air current, which is obtained at the outlet (upstream) of a blow-molding process; associated with this method is the advantage that this drying-air current is dried to a relatively low dew point, that it is already completely conditioned (filtered and de-oiled), and that this drying-air current, which would otherwise have to escape needlessly into the open air, is now fed into the granulate drier.
The term drying air is hereinafter intended to mean the air current which is introduced into the granulate drier. With respect to the blow-molding process, this drying air is, however, to be designated as scavenging air, because according to the invention the scavenging air from the blow-molding process is to be used for introduction into the granulate drier.
Hence, a plurality of advantages are simultaneously achieved. A scavenging-air current that would otherwise be conducted needlessly into the open air is used as a drying-air current for the granulate drier, so that the drier need not have its own separate compressed-air current made available, as has been done in the prior art. Therefore, the method according to the invention is not very machine-intensive, because only one corresponding line connection need be produced from the outlet of the blow-molding process to the granulate drier according to this method.
In accordance with the invention, therefore, the scavenging air resulting during the blowing proc
REFERENCES:
patent: 2607666 (1952-08-01), Martin
patent: 4578879 (1986-04-01), Yokoyama et al.
patent: 4636084 (1987-01-01), Kopernicky
patent: 5316735 (1994-05-01), Ivanov et al.
patent: 5422080 (1995-06-01), Sinn et al.
Kunststoffe, vol. 73, No. 4, Apr., 1983, p. 189, "Abwarmenutzung Zur Materialtrocknung", Engelmann & Buckham Ancilleries Ltd.
Fasti Farrag & Stipsits GmbH
Kwon John T.
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