Operation and use of air knife dryer
2024-05-16
Basic usage tips for air knife dryers:
1、 Each drying device has its specific application range, and for each material, there can be several drying devices that can meet basic requirements, but only one can be found. If the selection is improper, users not only have to bear unnecessary one-time high procurement costs, but also have to pay a heavy price throughout the entire usage period, such as low efficiency, high energy consumption, high operating costs, poor product quality, and even the device cannot operate normally.
The following are the general principles for selecting an air knife dryer. It is difficult to say which one or several items are the most important. The ideal selection must focus on one's own conditions, and sometimes a compromise is necessary.
1. Applicability - The drying device must first be suitable for specific materials and meet the basic usage requirements of material drying, including the ability to handle materials well (feeding, conveying, fluidization, dispersion, heat transfer, discharge, etc.), and meet the basic requirements of processing capacity, dehydration amount, product quality, etc.
2. High drying rate - From the perspective of drying rate alone, during convective drying, the material is highly dispersed in hot air, with a low critical moisture content and fast drying speed. Moreover, with the same convective drying method, the critical moisture content also varies, resulting in different drying rates.
3. Low energy consumption - Different drying methods have different energy consumption indicators. Generally, the thermal efficiency of conductive drying can theoretically reach 100%, while convective drying can only be around 70%.
4. Save investment - drying devices that perform the same function may have significantly different costs, so the lower one should be chosen.
5. Low operating costs - equipment depreciation, energy consumption, labor costs, maintenance costs, spare parts The operating costs should be as low as possible.
6. Priority should be given to selecting dry materials with simple structure, sufficient supply of spare parts, high reliability, and long service life
Drying device.
7. Meet environmental requirements, have good working conditions, and high safety.
Before selection, it is often helpful to conduct drying experiments on materials and gain a deep understanding of the advantages and disadvantages of drying devices already used for similar materials, which can help with appropriate selection.
9. Do not rely solely on past experience, focus on absorbing new technologies, and listen more to expert opinions.
2、 On the production line of filling products, the wind knife dryer should apply labels, spray text, or box packaging on the outer surface of the packaging bottles of the filled products (such as wine, soda, etc.). To achieve better results, it is required to dry the surface of the packaging bottle. At present, in actual production, packaging bottles are generally dried or blown dry.
In production, the drying process generally adopts a brush drying combination or a hot oven drying method. The brush bottle device mainly uses a brush to rotate and remove water droplets on the bottle wall. Due to the use of contact treatment, the effect of bottle brushing is closely related to the appearance of the bottle. Rotary type (such as cylindrical) bottle brushes have good effects, while non rotary shaped bottles have some parts on the surface that do not come into contact with the brush. After brushing the bottle, there is still a water film on the outer wall of that part. In addition, during use, the brush is prone to accumulating dirt, which may transfer to the outer wall of the bottle and affect packaging quality. The hot drying oven has a simple structure and thorough drying, but it has a high thermal power and working temperature. When arranging automatic production lines, area isolation is required. During drying, water needs a long time to completely evaporate, which is not suitable for high-yield online production. In addition, when the transmission system is blocked during work, such as bottle jamming or bottle inversion, the packaging bottles may stay in the oven for too long, which may cause bottle explosions. In addition, for products with high cleanliness requirements, drying is generally not allowed after the cleaning and rinsing process. This is because it is not only necessary to ensure the dryness of the packaging bottle surface, but also to solve the problem of water spots on the product surface and rinsing water caused by impurities after drying.