Question:
Examples of continuous shelf moving dryer are
Examples of continuous shelf moving dryer are
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Continuous dryers enhance productivity by allowing non-stop operation and uniform drying with reduced processing time.
Updated On: Jul 14, 2026
- Vacuum dryer
- Tray dryer
- Spray dryer
- Turbo tray dryer
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The Correct Option is D
Approach Solution - 1
Drying is an essential unit operation in pharmaceutical manufacturing to remove moisture from solid and semi-solid dosage forms. Dryers can be classified as batch or continuous based on operation.
- Continuous shelf moving dryers involve a continuous movement of trays or shelves through the drying chamber, allowing for uninterrupted drying of materials.
- Turbo tray dryer is an example of a continuous shelf moving dryer where trays holding the product move continuously or intermittently through heated air streams. This design improves drying efficiency by combining convection drying with movement.
- Other dryers like vacuum dryer and tray dryer generally operate in batch mode, while spray dryers are used for drying liquids into powders through atomization.
Thus, turbo tray dryer is the correct example of a continuous shelf moving dryer commonly used in pharmaceutical drying processes.
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Approach Solution -2
Dryers used in pharmaceutical manufacturing are grouped by whether the material moves continuously through the drying chamber or sits in a fixed batch until drying finishes. Sorting the four options into these two groups picks out the answer quickly.
- Vacuum dryer: A vacuum dryer holds a static batch of material inside a closed chamber under reduced pressure. The load does not move through the equipment on shelves, so it is a batch dryer, not a continuous shelf-moving one.
- Tray dryer: A tray dryer loads wet material onto fixed trays inside a cabinet and dries the whole batch at once with heated air. The trays stay in place for the entire cycle, making this a batch process as well.
- Spray dryer: A spray dryer atomizes a liquid feed into fine droplets that dry almost instantly in a stream of hot air. It has no trays or shelves at all, so it does not belong in the shelf-moving category.
- Turbo tray dryer: A turbo tray dryer carries trays on a rotating or moving assembly that passes continuously through a heated air stream, so fresh trays enter as dried ones exit. This continuous shelf movement is exactly what distinguishes it from the batch dryers above.
Only the turbo tray dryer keeps its shelves in constant motion through the drying zone while the process runs.
So the correct answer is Turbo tray dryer.
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