Belt dryers have a wide range of applications, and currently have their abilities in the pharmaceutical, food, biological, chemical and other fields. However, the selection criteria are different in each field, because the requirements and parameters of drying materials in each field are quite different. For example: in the pharmaceutical industry (especially traditional Chinese medicine), the viscosity of the extract is generally large, and the drying temperature is stricter, the melting point must be controlled accurately (especially for polysaccharide materials), and the control range of the vacuum degree must be different The heating temperature of the section must be equipped with online automatic adjustment function and so on. In addition, the detection system should be as perfect as possible to meet the pharmaceutical GMP standards. For the food industry, the solid content of the material extract is generally relatively large (over 65%). The requirements for output and the specific volume and appearance of the product are the key to the selection standard of vacuum belt dryers. Food-grade vacuum belts There are two elements in the selection process of the type dryer: one is the consumption ratio of unit energy consumption, and the other is the supporting equipment such as the pre-conveying of raw materials, the fine crushing of dried products, and packaging. As for the vacuum belt dryers used in biological and chemical industries, due to the different forms of products, the selection criteria are extremely complicated, so you need to be extra cautious.
The first step in choosing a vacuum belt dryer is to conduct a sample test on the dried material, which is very important. Therefore, for equipment suppliers, whether they have material testing equipment and experienced sample personnel is a direct way for customers to measure the true ability of manufacturers. Qualified vacuum belt dryer manufacturers generally can provide customers with a copy within a short time after the material test, including: the actual evaporation of the material, the dynamic drying vacuum, the distribution of the drying temperature, the size of the feed, the actual drying time, and the actual Technical parameter reports such as product production capacity and unit energy consumption ratio, so that customers can choose equipment models and specifications that can meet production according to their requirements.
The second step in choosing a vacuum belt dryer 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 material test report in accordance with the customer's production indicators and working conditions and give a detailed statement of the design reasons in the plan. The technical design plan is an extremely important part of assessing the manufacturer’s vacuum belt dryer manufacturing capacity, especially the manufacturer’s description of the key technology of the equipment, such as: vacuum system design, heating system design, and correction system design. Design, design of cleaning system and design of feeding and discharging system, etc. Another aspect of manufacturing capability is to examine the actual usage of the manufacturer's users. According to the list of users provided by the manufacturer, the customer can request an on-site inspection. If the manufacturer does have sufficient strength, it will generally not refuse this reasonable request from the customer, and some can even provide multiple visit targets for the customer to choose from.
The third step in choosing a vacuum belt dryer is to examine the manufacturer’s actual processing capacity and production scale. Due to the characteristics of large volume, many auxiliary equipment, high configuration requirements, and complicated intermediate links, the vacuum belt dryer is not easy to maintain the long-term stability of the equipment. The price of this kind of equipment is also relatively expensive, users generally are optimistic about its drying capacity and technical advantages and spend huge amounts of money to purchase, so they all hope to recover the cost as soon as possible to improve the economic benefits of the enterprise. Therefore, when purchasing equipment, you must choose a manufacturer with a scale, actual design and manufacturing experience, and a reliable after-sales service guarantee system to rest assured. Of course, the vacuum belt dryer provided by such a manufacturer generally has a slightly higher price, but For users, there is a sense of security in use, and customers must not be greedy for temporary low prices that may affect the overall situation.
Scope of application
It is used for drying flakes, strips and granular materials with good air permeability. It is especially suitable for materials with high moisture content such as dehydrated vegetables and Chinese herbal medicine pieces, but the material temperature is not allowed to be high; this series of dryers have fast drying speed, The advantages of high evaporation intensity and good product quality. For the paste material of the dehydrated filter cake, it can be dried after being granulated or made into a rod shape.