Introduction to drying machine
In the whole process of dyeing and finishing, according to the different requirements of the finishing process, the finished fabrics need to be dried multiple times. In particular, semi-finished products generally need to be dried between each finishing process. For example, cotton fabrics Between bleaching and silk finishing, and between silk finishing and dyeing, drying is generally required in order to avoid uneven silk finishing and color differences before and after dyeing caused by the reduced concentration of alkali solution or dye liquor. Another example is pad dyeing with insoluble azo dyes, which needs to be developed after the phenol base is dried to increase the color depth. In order to avoid color matching, it also needs to be dried immediately after printing. Another example is the pre-baking of fabrics that have been padded with resin primary polymers or disperse dyes before baking. On the one hand, the moisture on the fabric is removed for the needs of baking and hot melting. On the other hand, it can prevent the resin from Or the migration of dye affects the finishing quality of the product. Therefore, the dryer is one of the important unit machines in dyeing and finishing equipment.
Drying is a process that uses thermal energy to evaporate the remaining moisture in semi-finished and finished fabrics after mechanical dehydration, drying them and reducing the moisture in the fabric to below the natural moisture regain rate.
In order to meet different process requirements, there are many types of dryers. According to the different drying methods, dryers can be roughly divided into three types: drum dryers, hot air dryers and infrared dryers. In addition, there are superheated steam dryers, vacuum dryers, high-frequency dryers and microwave dryers.
The production efficiency of the dryer directly affects the high-speed, efficient and continuous operation of the dyeing and finishing equipment. At the same time, the heat energy consumption of drying accounts for a large proportion of the total heat energy consumption in the entire dyeing and finishing production process. Therefore, rational selection of drying methods and dryers is an important step in the current development of dyeing and finishing equipment to improve the production efficiency of the dryer, reduce the heat energy consumption during the drying process of finishing fabrics, and research and develop new dryers that meet the needs. Task.
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