Drying process is the core technology of dried fruit production, which directly determines the taste, nutrition, appearance, shelf life, and food safety of dried fruits. At present, the production of dried fruits in the market is mainly divided into traditional natural drying process and modern intelligent drying process. The production principles, processing effects, applicable scenarios, and product quality of the two processes are greatly different. A deep understanding of the advantages and disadvantages of the two processes can help production enterprises optimize their production mode and enable consumers to clearly distinguish between high-quality dried fruits and ordinary dried fruits.
Natural drying is the oldest and most traditional fruit drying process, which uses sunlight radiation, natural wind force, and ventilation conditions to evaporate the moisture in fresh fruits and achieve fruit dehydration and drying. The biggest advantage of this process is its extremely low production cost, no need for professional drying equipment and electricity consumption, simple operation, low threshold, suitable for small-scale and small batch processing and production by farmers, and also the mainstream processing method in the early fruit drying industry.
However, the shortcomings of the natural drying process are very prominent, making it difficult to meet modern food production standards. Firstly, due to strong weather and environmental constraints, production cannot be carried out in rainy, humid, and hazy weather. The large temperature difference between day and night can easily lead to uneven drying of dried fruits, resulting in external dryness and internal humidity, as well as mold growth and moisture regain; Secondly, it is difficult to control the hygiene conditions. During the outdoor drying process, dried fruits are easily contaminated with impurities such as dust, mosquitoes, pollen, etc., which poses a risk of exceeding microbial standards and contamination, and poses a significant food safety hazard; Thirdly, the product quality is unstable, and exposure to high temperatures can easily damage the heat sensitive nutrients such as vitamins in fruits. It is also prone to problems such as browning, dark color, and uneven taste. The appearance, taste, and shelf life of the finished product cannot be unified, making it difficult to standardize mass production.
Intelligent low-temperature drying is the mainstream process in the modern fruit drying industry, relying on fully automatic drying equipment and intelligent control systems to achieve closed, standardized, and refined dehydration processing. This process precisely controls the drying temperature, relative humidity, circulation wind speed, and drying time, and customizes exclusive drying curves for different fruit pulp characteristics and moisture content. It gradually removes the moisture from the pulp, completely freeing it from the limitations of the natural environment, and can be mass-produced continuously throughout the year.
Compared to traditional air drying, the advantages of intelligent drying technology are very significant. In terms of nutrient retention, the low-temperature drying mode avoids the damage of high temperature exposure to nutrients, and maximizes the locking of the original dietary fiber, vitamins, fructose and other nutrients in fruits, resulting in higher nutritional value of dried fruits; In terms of appearance and taste, closed drying can accurately control the dryness, resulting in uniform dryness and wetness of the finished product, bright color, flexible flesh, and no problems such as burning, drying, or blackening. The product standardization is extremely high; In terms of food safety, the entire process is sealed and sterile to prevent external impurities from contaminating. With standardized sterilization processes, microbial indicators are controllable and the shelf life is longer; In terms of production efficiency, automated equipment can produce continuously in batches, greatly improving production capacity and adapting to the production needs of large-scale enterprises.
Of course, there are also certain shortcomings in the intelligent drying process, as the initial equipment investment and energy consumption costs are higher than those of natural drying, and there are certain requirements for production technology and parameter control capabilities. Overall, natural drying is only suitable for the production of niche handmade, bulk low-end dried fruits, while intelligent drying, with its stable quality and safe production process, has become the only mainstream process for brand dried fruits and export grade dried fruits. It is also an inevitable trend for the standardized and regulated development of the dried fruit industry.
