As an important preservation and drying equipment, dryers play an important role in fields such as food industry, pharmaceutical industry, and bioengineering. Through freeze-drying technology, it is possible to maintain the original form, odor, and nutritional composition of food, medicinal materials, and other substances, extend their shelf life, and improve the preservation effect of biological materials. In the future, with the progress of technology and the continuous improvement of application demand, the development prospects of freeze-drying machines will be bright.

As an important equipment, freeze-drying machines have been widely used and developed in recent years. With the increasing demand for food quality and safety, freeze-drying technology has become a popular research direction. More and more enterprises and research institutions are investing in the research and production of freeze-drying machines to meet market demand. At the same time, emerging freeze-drying technologies are also constantly emerging, such as ultrasonic assisted freeze-drying, microwave assisted freeze-drying, and vacuum freeze pulse method. The emergence of these new technologies will further improve the efficiency and effectiveness of freeze-drying machines.

What is the difference between a low-temperature freeze-drying machine and a high-temperature freeze-drying machine?

A low-temperature freeze-drying machine is a device that freezes materials at lower temperatures and dries them under reduced pressure. The main principle is to quickly freeze the material at a freezing temperature, and then gradually sublimate the water from the material in a vacuum environment, thereby enabling the material to maintain its original physicochemical properties and nutritional composition. The core of a low-temperature freeze-drying machine is a low-temperature freezer and a vacuum system. Low temperature freeze-drying machines typically require a freezing temperature below -40 ° C and a vacuum degree below 10-4 Pa.

A high-temperature freeze-drying machine is a device that freezes materials at higher temperatures and dries them through vacuum. The main principle is to freeze the material at a higher temperature and then gradually sublimate the water from the material in a vacuum environment, thereby achieving the freeze-drying process. The core of a high-temperature freeze-drying machine is a high-temperature freezer and a vacuum system. High temperature freeze-drying machines typically require a freezing temperature between -20 ° C and 0 ° C, and a vacuum degree below 10-3 Pa.

There are significant differences between low-temperature freeze-drying machines and high-temperature freeze-drying machines in terms of freeze-drying temperature, working principle, drying effect, and applicability. The selection of an appropriate freeze-drying machine depends on the characteristics and requirements of the material. For sensitive substances with high nutritional and flavor requirements, low-temperature freeze-drying machines are a better choice; For heat-resistant substances with high speed requirements, high-temperature freeze-drying machines are a better choice.

The application of freeze-drying machines in the food industry is mainly reflected in the production of fresh food. Freeze drying technology can help food maintain its original form and nutrients while removing moisture, thereby extending its shelf life and taste. Freeze drying machines are also widely used in drug production in the pharmaceutical industry and in the preservation of biological materials in the field of bioengineering. Through freeze-drying technology, the pharmaceutical industry can preserve drugs for longer periods of time, reducing their loss and damage; In the field of bioengineering, biological materials such as cells and enzymes can be freeze-dried and stored for subsequent experiments and use.

The principle of a freeze-drying machine is based on the three state change law of matter. Under appropriate conditions, substances can directly transform from a solid state to a gaseous state, a process called sublimation. The freeze-drying machine utilizes a low-temperature and vacuum environment to freeze substances and apply an appropriate vacuum degree to evaporate them. After condensation, they are collected to obtain freeze-dried products. In this way, the moisture of the substance can be removed, thereby achieving the purpose of drying.