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US 6,582,161 B2Granted
Pneumatic transport of chargeable resin powder
AssigneeShin-Etsu Chemical Co., Ltd.
InventorGenji Noguki
Life of this patent
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Abstract
A chargeable resin powder is transported by means of an airstream which is a mixture of air and steam. This enables pneumatic transport of chargeable resin powder without building up electrostatic charges.
Claims7
A pneumatic transport method for transporting a powder of a chargeable resin comprising the steps of:
- I. providing a stream of air;
- and then
- II. adding steam to the stream of air thereby producing an initial air-steam mixture;
- and then
- III. mixing the powder with the initial air-steam mixture thereby producing a powder-laden pneumatic stream;
- and then
- IV. conveying the powder-laden pneumatic stream to a zone where the powder is removed from the powder-laden pneumatic stream, thereby producing a powder-depleted stream;
- wherein the amount of steam added to the initial air-steam mixture is adjusted so as to meet the following relationship:
- 0° C.<(T1−K1)° C.≦60° C.
- wherein T1 is the temperature of the powder-depleted stream;
- and
- wherein K1 is the dew point of the initial air-steam mixture.
9 more elements
A pneumatic transport method for transporting a powder of a chargeable resin comprising the steps of:
- I. providing a stream of air;
- and then
- II. adding steam to the stream of air thereby producing an initial air-steam mixture;
- and then
- III. mixing the powder with the initial air-steam mixture thereby producing a powder-laden pneumatic stream;
- and then
- IV. conveying the powder-laden pneumatic stream to a zone where the powder is removed from the powder-laden pneumatic stream;
- wherein the amount of steam present in the initial air-steam mixture is sufficient such that
- (a) no electrostatic charge builds up on the powder;
- and
- (b) there is no agglomeration of the powder when the powder is removed from the powder-laden pneumatic stream.
8 more elements
A pneumatic transport method for transporting a powder of a chargeable resin comprising the steps of:
- I. providing a stream of air;
- and then
- II. adding steam to the stream of air thereby producing an initial air-steam mixture having a temperature of 10° C. to 70° C.;
- and then
- III. mixing the powder with the initial air-steam mixture thereby producing a powder-laden pneumatic stream;
- and then
- IV. conveying the powder-laden pneumatic stream to a zone where the powder is removed from the powder-laden pneumatic stream, thereby producing a powder-depleted stream;
- wherein the amount of steam added to the initial air-steam mixture is adjusted so that
- (a) no electrostatic charge builds up on the powder;
- and
- (b) there is no agglomeration of the powder when the powder is removed from the powder-laden pneumatic stream.
8 more elements
Dependencies are inferred from the claim text.