Yamato PULVIS MINI BED GB210B Instruction Manual Download

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5. Handling Precautions

Drying Method under Appropriate Condition

Items for GB210A

(1) The best appropriate drying condition is differed depending on the sample to be dried. Inquire

the data for the partial example of various samples.

(2) Adjust the drying condition so as to match to the various errors to be possible to occur such as

too much adhesion of the sample to the drying chamber, too high density of the sample, too low
temperature around inlet, too high or too low pressure of spray air, too much feeding amount of
sample.

(3) When the spray direction is changed by the adhesion of the sample to the spray nozzle during

operation, turn "ON" the pulse jet switch, and blowout the adhesive from the tip of the nozzle
using pressurizing air. Even thought the adhesive is not blowout, dismount the spray nozzle,
and clean the tip of the nozzle using the soaked paper in water.

(4) The possible cause for adhesion of the sample to the cyclone part is either not evaporating the

solvent (distilled water or ion-exchanged water) with enough or the property of the sample itself
(low melting point, absorption, etc.)

。

For depleting the powder, increasing the
amount of heat for sample is the best measure.
Therefore, perform either measure below, to
increase either temperature around inlet or flow
rate of the drying air, or to reduce the feeding
amount of the sample, that is, to reduce the
difference between the temperature around
inlet and that around outlet. When the reason
is in the property of the sample itself, adjust the
sample by adding the special additive, etc.

(5) In the case that the hygroscopicity is high,
the product may become the moist powder in
the container. Change the drying condition
following the method in (4), or, if required, heat
up the container for product before operation.

(6) The orifice of the spray nozzle is 460

. If the

sample is blocked with suspension at orifice
part impetuously, use the 508

and 711

nozzles prepared for the orifice as optional
(Nozzle main body P33." Cleaning After Using
",the nozzle main body, the needle, and the ring
in the exploded view of the spray nozzle are
common with the 406

nozzle

）

These 508

and

711

nozzles are differed on the point of the

size of the spray pattern and particle diameter
of the drop slightly compared to the 406

one,

and these differences may affect the
interference status. Refer to the Graph 1 for
the relation between spray air pressure and
spray airflow rate (atmospheric conversion).

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(7) The too small powder (few

or less) among dried ones is impossible to be collected, and

exhausted to the outside through the blower. If this exhausted amount of the too small powder
becomes more, decrease either spray airflow rate or spray air pressure. Also, since the particle
diameter becomes smaller as the density of the sample is lower, adjust the density of the sample
if required.

ay airflow r

ate (atmosph

eric conversion

Spray air pressure