Liquid freeze-drying machine: There are various drying methods for freeze-drying machine, such as sun drying, boiling drying, drying, spray drying and vacuum drying, but the common drying methods are usually carried out at temperatures above 0 ℃ or higher. The products obtained from drying generally have a reduction in volume and a change in texture Hard problems, most volatile components will be lost, some thermosensitive substances will undergo denaturation and deactivation, and some substances may even undergo oxidation. Therefore, there is a significant difference in the characteristics of the dried product compared to before drying. The freeze-drying method is basically carried out below 0 ℃, that is, in the frozen state of the product, and only decreases in the later stage When the residual moisture content of the product is low, the temperature of the product should be raised to above 0 ℃, but generally not exceeding 40 ℃. Under vacuum conditions, when water vapor directly sublimates out of the freeze dryer, the drug remains in the frozen ice shelf, forming a sponge like porous structure. Therefore, its volume size after drying is several Almost unchanged. Before reuse, simply add a note Shooting water, and standing again Dissolve immediately.

The low-temperature drying of Shanghai Yetuo freeze dryer involves pre cooling and freezing substances with a lot of moisture into a solid state, and then immediately sublimating the water vapor under the standard of a vacuum pump, leaving the substance in the ice shelf during freezing and cleaning. Therefore, its volume will not change after drying, and the loose porous structure needs to digest and absorb heat during sublimation To slow down the sublimation rate by reducing the temperature of the product itself, in order to increase the sublimation rate and reduce the drying time, it is necessary to carry out moderate heating of the product All dryness and agitation are carried out at lower temperatures.

Can a freeze dryer dry frozen liquid raw materials?

The amount of water vapor in the compressed air of Shanghai Yetuo freeze dryer is determined by the temperature of the compressed air: while maintaining the working pressure of the compressed air without changing, reducing the temperature of the compressed air can lower the water vapor content in the compressed air, and unnecessary water vapor will solidify into liquid. The freeze dryer uses this basic principle to select industrial refrigeration dry and compressed air. Therefore, the refrigerated dryer is equipped with a refrigeration unit. The refrigeration unit of a freeze dryer belongs to the category of reduced cooling, consisting of four basic components: refrigeration unit, cooler, air conditioning evaporator, and air conditioning expansion valve. They are connected by pipelines to create a closed system software.

The purpose of Shanghai Yetuo freeze dryer is to freeze moisture containing substances into solids first, and then sublime the moisture in the solids into a vapor state to remove the moisture and store the substances. Simply put, it is a dry and rough entire process based on refrigerated raw materials. The freeze dryer is equipped with a liquid crystal display screen, a Chinese page, and a sample drying curve chart; It has an imported refrigeration compressor and is equipped with a heat exchanger, which expands the air conditioning cooling capacity and improves the water capture capability; Its cold trap has a large opening, no internal fan coil, and is equipped with a pre freezing function for the test sample. In addition, the pre cooling frame can be used as a drainage bucket to accelerate the drying rate. The cold trap and actual operating surface are made of all stainless steel plates, which are corrosion-resistant and easy to smooth, and have a fully transparent bell jar. Moreover, its unique personality makes freeze dryers more common in daily applications.

Although small and medium-sized freeze dryers cannot immediately dry frozen liquid raw materials, large and medium-sized freeze dryers can fully guarantee this.