Drying knowledge small science

Views: 12     Author: Site Editor     Publish Time: 2021-01-26      Origin: Site

Nowadays, there are more types of products on the market that need to be dried. Common types of materials in life include rhizomes, fruits, meat, aquatic products, industrial types, etc. Removal of moisture is only the first step in product drying. More importantly, to ensure the quality of drying, different materials require different drying processes.


1、Meat and poultry: inhibit bacteria and balance dehydration

Most meats require a lot of dehydration, otherwise they can easily deteriorate. Therefore, the technical point of control is to inhibit bacteria and balance dehydration. Typical dried products include sausages, bacon, duck and chicken. The common drying method is static, taking sausage as an example. In the early stages, rapid heating is required to ensure that the material does not deteriorate. However, the temperature during the drying process cannot be too high. Otherwise, the grease will overflow quickly. Under the action of high temperature, the color will turn black and affect the appearance and quality of the finished product.

2、Aquatic products: antibacterial and two-stage differentiation

Drying of aquatic products generally requires relatively low temperatures, such as sea cucumbers, abalones, shrimps, and freshwater dried fish. The drying cycle is long to avoid high temperature after drying to affect the quality of the product, and the water content of aquatic products is generally large. Therefore, controlling the amount of water discharge is an important factor in determining the drying quality of seafood and maintaining the color of seafood. It requires a lot of circulating wind and the wind speed is relatively high. Avoid water vapor staying on the surface of the material, the control point is to inhibit the growth of bacteria.


3、Flowers: color fixation, humidity control

Generally, the drying of mosaics requires a higher appearance of the finished product. Therefore, the focus of control is on color protection, humidity control, rapid dehydration and temperature control. Therefore, the temperature will not be too high and the dehydration speed should not be too fast. Typical materials are roses and chrysanthemums. , Dendrobium, etc. Commonly used drying methods are mainly advection or penetration.


4、Fruits: Slow dehydration

Fruit products include kiwi, fig, persimmon, dragon fruit, etc. These products generally have a higher sugar content. Therefore, it is necessary to strictly control the temperature, humidity and time, and not to dry quickly. Special attention should be paid to the saccharification of dried fruits during drying. If the temperature is too high and the dehydration is too fast, the material will turn black.


5、Industrial: fast and efficient

The most common industrial categories are printing, electroplating, rubber, paper tube, etc. These materials need to be dried all year round, and the seasonality is not obvious. Therefore, the drying device should be able to meet the requirements of different working conditions. Generally, the drying object is relatively single and fixed, and there is no need to consider the versatility of the drying object. The operation is highly automated, and it is best to run automatically. The shapes of different drying objects are very different. Some materials will contain strong corrosion, so there will be special requirements, such as anti-corrosion. The focus of control is high temperature, speed, high efficiency, energy saving, all day.



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