- Laboratory Ovens & Industrial Ovens
- Plant Growth Chambers & Rooms
- Climatic & Environmental Test Chambers
- Pharmaceutical Stability Chambers & Rooms
- Weathering Testing
Vacuum Ovens & Dryers
The Advantages
The advantages of using the Votsch VVT Vacuum Oven…..
Heat-sensitive mediums (e. g. pharmaceutical products) are dried with care
Reduced drying times due to lowering of the pressure
Due to the extremely low remaining oxygen content in the drying oven there are no oxidation processes
Evaporating fluids (e. g. solvents) can be recovered
Optimum drying conditions for light, powdery products as there is no turbulence (no convection)
No “skin-forming” on the product being dried; therefore constant drying performance
Economic because steam or warm water from other processes can be used as a heat medium
Flexible heating.
Range of Applications
You can dry products from almost all branches of industry in a vacuum drying oven, e. g.:
Pharmaceutical industry
Chemical industry
Cosmetics industry
Food processing industry
Electrical and electronic engineering
Precision engineering and optics
Aerospace industry
Research and development
Microstructure techniques
Nanotechniques
Plastics and ceramics
Textiles
Surface techniques
Design
Our vacuum drying ovens are of compact design. The major components are:
- Drying oven with shelves
- Heating and cooling aggregate for the thermal medium
- Vacuum pump
- Condenser with storage vessel.
Construction Features
All components of the drying oven itself are of stainless steel with material class 1.4571 as these may come into contact with the product. The external housing and reinforcements are made of stainless steel with the material class 1.4301.
The interior of the drying oven is designed in compliance with GMP-/FDA regulations. This is important when the product being dried should on no account react to other substances or when product entrainment shall be prevented during loading/unloading.
Inspection glass (200 mm diameter) in the door
Heat-resistant silicon seal in the door
Seals can be easily replaced when necessary
Double-jointed hinge to ensure that the door closes tightly and prevents overwearing the seals
Additional flanges are provided for special applications.
Heating Modes
Electrical
Warm water
Thermal oil
Steam
Infrared radiation
Microwave (HF)
Temperature Range
The maximum rated temperatures that can be reached at the product being dried depend on the mode of heating used for the drying oven.
Mode of Maximum Heating Temperature in °C
Electric 200 / 400
Warm water 95 / 140
Thermal oil 200 / 250
Steam according to the steam pressure
Heating Modes
We offer four heating solutions:
- Electrical
- With heating medium
- Infrared radiation
- Microwave (HF).
The first two processes are based on the principle of contact heating. This means that the heat is conducted from the heat medium through contact areas to the product. With the electrical version, tubular heaters are fed in coils through the hollow shelves (sandwich construction). With the version using heat medium you have three possibilities:
- Warm water
- Thermal oil
- Steam.
If you wish to heat using a heat medium, we equip the drying oven with pressure-tight, hollow shelves.
The difference from the electrical version is that the heat transfer medium flows through channels and then fills the entire cavity of the shelf. A separate thermostat controls the temperature of the heat medium. The heated medium is pumped in a cycle through the individual shelves. With the steam heating version a special valve is responsible for controlling the amount of steam. This control operates without auxiliary power so that it is possible to use this type of control in an explosion-proof room. With steam it is possible to heat in two different ways, the temperature of the steam being important:
- When T <100 °C the steam is routed into a heat exchanger where the heat energy of the steam is transferred to the water. The heated water is pumped through the shelves.
- When T is >100 °C the steam is fed into the distribution system for the shelves.
For heat treatment of material used by the aerospace & defence industries, Vötsch Industrietechnik offers the appropriate ovens which fulfil the requirements of the standard AMS 2750 D.
