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Cyclone Screener for APIs

Screening API Without Exposure: How to Ensure Containment in Screening and Maintenance

| Author / Editor: Frank Pahl* / Manja Wühr

Screen inspection

The inspection hatch for checking the screen cylinder can be opened using a glove integrated in the flexible liner. The screen cylinder can be rotated manually by almost 360° and, thanks to the built-in light, it can be inspected for damage or contamination through the film. Once inspection has been completed, the inspection hatch can be closed again using the film gauntlet. Using this procedure means that the operator has no contact with the high-risk substance in the machine at any time whatsoever.

Replacing the screen

If any damage to the screen fabric is found during the screen inspection, this will necessitate replacing the damaged screen. This procedure can also be carried out using liner technology without any contact with the screened product. If the machine has stopped, the drive unit for the screen rotor is removed from the housing lengthwise together with the screen cylinder. The weight of this unit is supported by an extraction device. The plastic film system that was attached when the machine was fitted is deployed in this process; it forms a tubular working space, in which the screen cylinder and the screener rotor are located.

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Ensuring Reliable and Safe Operation

By using appropriate double-crimp-and-cut techniques, it is then possible for the operator to remove the used or damaged screen inside the plastic liner and to install the new screen while using a new liner, also within a protected environment. The use of a new liner prepares the machine for further operation and for the next screen replacement.

Replacing the dosing screw

The dosing screw conveys the product to the screen cylinder in a continuous process. The speed and thus the dosing rate can be adjusted using a frequency converter, depending on the particular product characteristics. To make adjustments to the range of dosing rates, it is possible to change the dosing screw geometry or to vary the speed with the frequency converter. The machine also allows for the dosing screw to be exchanged under containment conditions. The machine is opened using an extraction device in the same manner as for screen replacement. A film liner provides reliable protection to stop dust from escaping.

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