Apparatus and method for moisture control of particulate material
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United States of America Patent
Stats
-
Sep 18, 2001
Grant Date -
Jun 21, 2001
app pub date -
Dec 20, 2000
filing date -
Jun 13, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An apparatus and method for control of moisture content of material such as thermoplastic pellets (80) in a hopper (30) is controlled by supplying dehumidified air from a dessicant bed (90) to the hopper (30) and returning air from the hopper (30) to the dessicant bed (90). A dew point sensor (10) in the return air path determines the moisture content of the material (80) in the hopper (30), and when the dew point drops to a pre-set level, a diverter (134) causes the return air flow to bypass the dessicant bed (90) and to be re-supplied to the hopper (30) without dehumidification. Two dessicant beds are provided, one of which is on-process while the dessicant in the other is regenerated.
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