Static Vacuum Tray Dryer 32 Trays 35-150C No Particle Shape Damage

When a product cannot tolerate air, agitation or a temperature above 60 °C, drying becomes a static, sealed operation. The YZG-1000 static vacuum tray dryer is built exactly for that case: trays loaded with powder or granule sit on a heated shelf rack inside a vacuum chamber, and moisture leaves the product by conduction through the tray bottom while a vacuum pump holds the chamber at 0.098 MPa or better. There is no air stream, no impeller and no tumbling, so the material keeps its shape, its crystal form and its colour.

Because the boiling point falls with pressure, the static vacuum tray dryer works at a shelf temperature of 35 to 150 °C while the product itself stays far below that, which protects thermolabile actives, prevents oxidation and stops polymerization in sensitive chemical intermediates. The chamber can be disinfected before the cycle begins and stays sealed throughout, so no impurity enters the batch between loading and unloading, a property that pharmacopoeia compliant production requires.

• 32 Tray Static Vacuum Drying: eight shelf layers carry 32 trays of 460 x 640 x 45 mm inside a 1000 x 1527 mm chamber, giving a large drying surface without any mechanical movement of the product.
• 35-150 °C Shelf Range: the heated tray rack runs from 35 to 150 °C, and because vacuum lowers the evaporation temperature, the product stays well below the shelf temperature throughout the cycle.
• No Particle Shape Damage: a static vacuum tray dryer has no agitator and no air flow, so crystals, needles, flakes and fragile granules come out exactly as they went in.
• 0.098 MPa Chamber Vacuum: the chamber holds a vacuum of 0.098 MPa or better with a 2X-70A 5.5 kW pump when a condenser is used, which keeps the moisture removal rate stable to the end of the cycle.
• Disinfection Before Drying: the sealed chamber allows a sanitizing step before the cycle, and no impurity can enter the batch during drying, which simplifies sterility and hygiene documentation.
• Low Pressure Steam Heat Source: the tray pipes take steam at up to 0.784 MPa, and waste heat steam, hot water or thermal oil can be specified when a plant wants to reuse existing utilities.

The static vacuum tray dryer is chosen wherever heat, oxygen or movement would change the product:

1. Thermal sensitive pharmaceutical powder and granule that decomposes, polymerizes or discolours in a hot air oven.
2. Easily oxidized chemical and food material such as vitamin, enzyme, polyphenol and natural pigment.
3. Crystalline and needle shaped product where particle breakage would change dissolution behaviour.
4. Small and medium batch production of many formulas, where tray loading gives flexible batch sizing.
5. Material requiring solvent recovery, with a condenser and receiver connected to the vacuum line.

Because loading and unloading happen with the chamber open and the cycle runs sealed, the static vacuum tray dryer also suits strongly irritating or toxic powders: the operator is exposed only briefly, and the exhaust is routed through the condenser instead of the room.

Why use vacuum instead of a hot air oven? Under vacuum the water boils at a much lower temperature, so a static vacuum tray dryer can drive off moisture with the shelf at 35 to 150 °C while the product itself stays cool. Oxygen is also excluded, so oxidation and colour change are avoided.

How long does a batch take? A 32 tray load at moderate moisture typically dries in 8 to 16 hours depending on the product, the shelf temperature and the vacuum level held. The cycle is longer than a fluid bed, but it is the only option for products that cannot be fluidized.

Will the trays distort at 0.784 MPa? No. The tray pipes are pressure tested and the rack is designed for 0.784 MPa steam with a safety margin. A pressure test certificate is supplied with each static vacuum tray dryer.

Can solvent be recovered? Yes. A shell and tube condenser plus a receiver is added to the vacuum line, and 85% to 95% of the solvent is recovered for reuse or disposal, depending on the condenser area selected.

The static vacuum tray dryer ships as a complete chamber with the shelf rack braced inside and the vacuum pump, condenser and control cabinet in separate export cases. Hydrostatic pressure testing of the chamber and the tray pipes, a vacuum leak test, temperature uniformity measurement and electrical safety checks are completed before dispatch, with material certificates and a chamber drawing set. The warranty covers 12 months, and we supply tray gaskets, door seals, pump spares and shelf pipe fittings as a two year spare kit.