Alibaba Store
Tmall Store
Jingdong Sstore
Shanghai Yetuo vacuum freeze dryer is an excellent drying method, and the dried material can be stored for a long time at room temperature under sealed conditions without the need for additives. Freeze dried items have a porous and crispy structure, and quickly rehydrate during use. After rehydration, the color, aroma, taste, shape, and activity of the items remain basically unchanged. Vacuum freeze dryers are particularly suitable for the food, health products, and pharmaceutical industries. The vacuum freeze dryer technology is a drying technique that freezes wet materials or solutions into a solid state at a lower temperature (-10 ℃~-60 ℃), and then sublimates the water in the liquid state directly into a gas state under vacuum (1.3-13 Pa), ultimately dehydrating the material. Shanghai Yetuo Vacuum Freeze Drying Machine Manufacturer always adheres to the corporate philosophy of "survival through quality, development through efficiency", dares to be the first, strives for excellence in product quality, and better serves our customers.
When using the Shanghai Yetuo vacuum freeze dryer, it is necessary to clean all parts of the instrument. Stainless steel parts should be cleaned with ethanol, and organic glass should be cleaned with physiological saline. Ampoules are cleaned using an ultrasonic cleaning machine.
Before freeze-drying, pre freezing is necessary. If you want to move, you need to prepare a low-temperature refrigerator at -40 degrees Celsius or -80 degrees Celsius. Place the items to be dried in the low-temperature refrigerator or liquid nitrogen, which usually takes about four hours. You can observe them directly from the outside. After the items have frozen firmly, the freeze-drying experiment can be carried out. Quickly move the items to the vacuum freeze dryer tray to ensure the freeze-drying effect.
The host and vacuum pump are connected by a green vacuum tube, and international standard clamps are used at the connection. This type of clamp is designed with a sealing rubber ring inside the clamp to effectively prevent air leakage. In terms of methods to prevent air leakage Apply an appropriate amount of vacuum grease on the rubber ring, and then tighten it with a clamp to make the connection more tightly fit together. If the clamp is not tightened, it will cause air leakage, resulting in the instrument panel displaying a digital value greater than 20pa when extracting vacuum. At this time, the airtightness of the vacuum pump and the glass cover of the vacuum freeze dryer should be checked.
There are two power sockets on the right side panel of the main unit of the vacuum freeze dryer. One is to connect the power cord of the vacuum pump to the main unit, and then plug in the main power supply on the second vacuum freeze dryer.
Before operating the vacuum pump, it is necessary to check whether vacuum pump oil has been added, otherwise it cannot operate normally. The oil level should not be lower than the centerline of the oil mirror. When the vacuum pump is first used, there may be strong shaking, but it will gradually become stable.
If the air tightness is poor, some vacuum grease should be applied to the sealing rubber ring above the cold trap, and the organic glass cover should be gently rotated onto the rubber ring. Then, the vacuum pump of the vacuum freeze dryer should be turned on to test its air tightness. To ensure the integrity of the air seal in the vacuum freeze dryer.
