The freeze-drying technology was initially used in the medical pharmaceutical field, but the manufacturing cost of pharmaceutical freeze-drying machines is high, so it is not suitable for the food freeze-drying processing industry. At present, there are two types of food freeze-drying machines: one is a low-temperature cold storage+vacuum drying box, called a cold storage type food freeze-drying machine, and the other is an in-situ freeze-drying machine, called a pre frozen food freeze-drying machine.

If it is a food freeze-drying machine, then hygiene standards are actually very important and need to be strictly implemented in accordance with national standards. Western countries have begun to implement HACCP systems in food production enterprises, implementing mechanisms for disinfection, sterilization, and hygiene management. Previously, many machines were made of galvanized steel plates, but now they are mostly made of stainless steel because galvanizing reacts with steam at a temperature of around 80 to generate a pollution source called micro powder, which can pollute the finished materials. This is a trend in the implementation of health standards, and in the future, more efforts will be made to strengthen health standards.

The freeze-drying machine has the advantage of preserving nutrients and basic preservation of color, aroma, taste, and shape in the freeze-drying processing of edible leaf grass. It can be used for freeze-drying processing of edible leaf grass freeze-drying powder, spinach freeze-drying powder, coriander freeze-drying powder, vegetable freeze-drying powder, etc. Provide leaf eating grass freeze-drying technology and solutions, and provide a series of freeze-drying machine equipment including small freeze-drying machines, pilot production freeze-drying machines, and large food freeze-drying machines for selection and use.

The freeze-drying method is basically carried out below 0 ℃, that is, when the product is frozen, it is only allowed to rise to a temperature above 0 ℃ when the residual moisture content of the product is reduced in the later stage, but generally does not exceed 40 ℃. Under vacuum conditions, when water vapor directly sublimates, the drug remains in the frozen ice shelf, forming a spongy porous structure, so its volume size remains almost unchanged after drying. Before reuse, as long as injection water is added, it will immediately dissolve.

The small vacuum freeze-drying machine, abbreviated as the small freeze-drying machine, has undergone technological updates. Currently, the new generation of small freeze-drying machines simplify the tedious operation of equipment, prevent material pollution, and control material moisture sublimation. It has achieved one click start and fully automatic operation, with programmable heating and temperature control functions. It can view the freeze-drying curve and facilitate users to observe the freeze-drying process of materials.