Low oxygen content when drying under low pressure, can prevent oxidation and deterioration of the dried materials, can dry flammable and explosive dangerous goods; can vaporize the moisture in the materials at low temperature, easy to dry heat-sensitive materials; can recover the valuable and useful components in the materials to be dried; can prevent the emission of toxic and hazardous substances in the materials to be dried, and can be an environmentally friendly type of "Green" drying. Therefore, the application of vacuum drying equipment is becoming more and more widespread.
Disadvantages of vacuum drying:
The need for a set of vacuum system that can pump water vapor, which makes the equipment investment cost is high, high operating costs; equipment production efficiency is low, small output. To overcome these shortcomings, many scientific and technological workers, made many efforts. At the same time, because vacuum drying has many advantages, some products have to use vacuum drying equipment. Therefore, the development of vacuum drying equipment will be very promising.
In addition, vacuum drying has a low drying temperature, drying chamber relative lack of oxygen, can avoid fat oxidation, pigment browning and a series of advantages, suitable for heat-sensitive food materials drying, in addition to the cost of equipment, drying costs are also relatively low, vacuum drying in the drying of food point has an important position.
Vacuum microwave drying absorbs the advantages of microwave heating and vacuum drying, is a very promising drying technology, therefore, it is recommended that our country to accelerate the development of vacuum microwave drying device.
Vacuum drying features:
1, rectangular studio, so that the effective volume to reach the maximum, microcomputer temperature controller, accurate and reliable temperature control.
2, toughened, bullet-proof double-layer glass door to observe the objects inside the working chamber at a glance, able to fill inert gas to the interior.
3, box door closure tightness can be adjusted, the overall molding of the silicone rubber door seal ring, to ensure that the box high vacuum.
4, the studio is made of polished mirror stainless steel plate, to ensure the durability of the product.
5. Storage, heating, testing and drying are all carried out in an oxygen-free or inert gas-filled environment, so there is no oxidation.
6, the shortest heating time, compared with the traditional vacuum drying oven, the heating time is reduced by more than 50%.
Technical characteristics of vacuum drying:
1.Continuous feeding and discharging are realized under vacuum, and the amount of feeding can be set freely according to needs.
2, the heating system can be steam, hot water and electric heating to thermal oil heating and other forms.
3, drying temperature from 25 ℃ -80 ℃ arbitrary adjustment, 20 minutes -60 minutes after the beginning of continuous discharge until the batch is completed.
4, the crawler adopts Teflon material, smooth running, reliable, uniform heat area. Crawler speed can be adjusted arbitrarily the number of layers 2-5 layers, according to the user's output requirements.
5, the use of a variety of fabric devices can be adapted to liquid, paste, powder and granular drying of various types of materials.
6, equipped with vacuum conditions of the automatic crushing system, according to the user's requirements can be selected arbitrarily dry particle size.
7, with CIP in place of the cleaning system, automatic cleaning fast and convenient.
8, the use of high-quality vacuum unit and carefully designed combination, with continuous high-capacity pumping rate and stable vacuum.
9, small energy consumption, no waste, low noise.
10, in full compliance with GMP certification requirements.
The main advantages of vacuum drying:
1, the whole set of process adopts automation, pipelining, continuity and programming.
2, the drying process is completed under vacuum and low temperature, the heat-sensitive materials do not change the nature, and there is no chance of dyeing bacteria.
3, suitable for a variety of difficult materials drying.
4, material dryness (moisture content) adjustable.
5, energy consumption is only one-third of centrifugal sprayer with the same output.
6, using PLC touch screen operation and control, and is equipped with continuous protection device.
7, the machine is reasonably designed, compact structure, easy to install and debug, to adapt to most of the working conditions placed.