Vacuum dryers are widely used in industry and are mainly used for drying small pieces of materials and fibrous materials. Because the material dried by the vacuum dryer has a certain shape, and it retains a certain shape after drying. The vacuum dryer consists of several independent unit sections. Each unit section includes a circulating fan, a heating device, a separate or common fresh air intake system, and an exhaust gas exhaust system. Therefore, the operating parameters such as the amount of drying medium, temperature, humidity and exhaust gas circulation can be independently controlled to ensure the reliability of the vacuum dryer operation and the optimization of operating conditions.

Vacuum dryers have a wide range of applications, and vacuum dryers are now available in the pharmaceutical, food, biological, and chemical industries. However, the criteria for selection in each field are different. This is because the requirements and parameters of dry materials in various fields are quite different. For example, in the food industry, the solid content of the material extracts is generally large ( More than 65%), the requirements of production and the specific volume and appearance of the product are the key to the selection criteria of vacuum dryer. There are two elements in the selection process of food grade vacuum dryer: one is the unit energy consumption. The problem of consumption ratio, the other is the supporting equipment such as the pre-stage conveying of raw materials, fine pulverization of products after drying and packaging. As for the vacuum dryers used in biological and chemical applications, the selection criteria are extremely complicated, so it is extremely cautious.

How to choose a vacuum dryer? It is important to carry out a small sample test on dry materials. Therefore, for equipment suppliers, whether they have material testing equipment and experienced sample personnel is a direct way for customers to measure the true capabilities of manufacturers. Qualified vacuum dryer manufacturers generally provide customers with a copy of the material's actual evaporation, dynamic drying vacuum, drying temperature, feed amount, actual drying time, etc. after a material test. Technical parameter reports such as actual product capacity, unit energy consumption ratio, etc., to facilitate customers to select the type and specifications of equipment that can meet production requirements.

The second step is to comprehensively examine the manufacturer's design level and manufacturing capabilities. Manufacturers generally provide a preliminary draft of the technical design plan based on the customer's production specifications and working conditions based on the material test report and a detailed statement of the design rationale in the plan. The technical design is an extremely important part of the manufacturer's ability to manufacture vacuum dryers, in particular the manufacturer's design description of the key technologies of the equipment such as the design of the vacuum system, the design of the heating system, the design of the correction system, The design of the cleaning system and the design of the feeding and discharging system. Another aspect of manufacturing capabilities is to examine the actual use of the manufacturer's users. Customers can request on-site visits based on the list of users provided by the manufacturer. If the manufacturer does have sufficient strength, it will not reject the reasonable request of the customer, and some can even provide multiple visit targets for customers to choose. Companies with limited manufacturing capabilities or low levels of technology are generally difficult to do.

The third step is to examine the actual processing capacity and production scale of the manufacturer. At present, there are no more than three companies with serial design and production capacity in China, especially manufacturers with an annual output of 10 vacuum dryers or more are estimated to have only one or two. Therefore, most domestic manufacturers are difficult to form standardized processing of vacuum dryer parts. The maintenance and maintenance of products provided by customers and the exchange of parts and accessories have major problems, which often directly affect the production of users. Efficiency, and due to the lack of practical experience, the mechanical structure of the equipment, the rationality of the configuration, the accuracy requirements of the manufacturing, etc. cannot be considered very well. Due to the large size, large number of auxiliary equipment, high configuration requirements, and complicated intermediate links, vacuum dryers are not easy to maintain the long-term stability of the equipment. The price of such equipment is also relatively expensive. Users are generally optimistic about its drying capacity and technical advantages and use huge sums of money to purchase, so they hope to recover the cost as soon as possible to improve the economic efficiency of the enterprise. Therefore, when purchasing equipment, it is necessary to choose a manufacturer with scale, practical design and manufacturing experience and a reliable after-sales service guarantee system. Of course, the vacuum dryers provided by such manufacturers generally have a slightly higher price, but for users. In terms of safety in use, Pnell Dry reminds customers not to be affected by the low price of the moment.