Dryfree mainly sells dehydrator, solar dryers, heat pump dryer machines and solar+heat pump dryer.

Tofu skin drying solution

The main ingredient of tofu skin is soybean, which is rich in protein and has high nutrient content. The proportion of glutamic acid in tofu skin is extremely high, 2-5 times that of other legumes or animal foods, and glutamate plays an important role in brain activity. The lecithin contained in tofu can remove cholesterol attached to the blood vessel wall. Tofu skin is a high-grade product in soy products. Its appearance is lustrous, it is light yellow, the strip is even, and the strip is hollow.

tofu-skin

The function of tofu skin:

Prevent hardening of the arteries.

Prevention of cardiovascular disease.

Protect the heart.

Has a good brain function and helps prevent Alzheimer's disease.

 Technical problems of tofu skin drying

Tofu skin is made from boiled soy milk. After a certain period of heat preservation, the surface protein of soybean milk is formed into a film to form a soft skin, which is exposed and dried. The cooked soymilk is kept at a higher temperature. On the one hand, the surface moisture of the soymilk is continuously evaporated, and the surface protein concentration is relatively increased. On the other hand, the thermal movement of the protein colloid is intensified, the collision opportunity is increased, and the degree of polymerization is increased, so that the coriander film is so As the time increases, the film thickness increases, and when the film reaches a certain thickness, it is tofu skin. After the tofu skin is uncovered, it is placed on the bamboo raft and drained. After the pulp is drained, it can be dried. The maximum temperature of tofu skin drying is controlled at 85 ° C, and the final material humidity is generally controlled at about 10-13%. tofu skin generally 4 kg of wet material can be dried to get 1 kg of dry material.

tofu-drying2

The tofu skin drying generally undergoes preheating, high temperature drying stage, constant temperature drying stage, and cooling and resurgence stage. The process of drying tofu skin  requires moisturizing rather than rapid dehumidification. In addition, the temperature control determines the important quality of the tofu skin, the oil and color of the surface. Finally, if the song is not properly controlled for humidity, drying process and cutting, the process of packing will cause the tofu skin to be brittle, affecting the output of the finished tofu skin and causing waste. Pay attention to the following technical points during the drying process of tofu skin:

   1. The moisturizing and drying process in the early stage has an important influence on the pecanization of tofu skin. The expansion of tofu skin determines the appearance quality of tofu skin.

   2. Oil and luster on the surface of tofu skin.

   3. The toughness of tofu skin after drying. Not easy to break.

   4. Different varieties of tofu skin cannot be mixed and dried.

tofu-drying1

The 5P/10p/20p air energy heat pump dryer is used for drying. The main principle of the heat pump used in the drying process is to use the heat pump evaporator to absorb the heat in the outside air or to recover the waste heat from the drying process. Work, transfer (transfer) energy to the drying box, the hot air in the drying box is heated repeatedly, absorbs the moisture in the material, cools itself by humidification, and passes through the process of hot air dehumidification or condensation to remove water. The water in the water is drained away and finally the material is continuously dried. The 5P/10p/20p air energy heat pump dryer is used for drying. The main principle of the heat pump used in the drying process is to use the heat pump evaporator to absorb the heat in the outside air, or to recover the waste heat from the drying process. Work, transfer (transfer) energy to the drying box, the hot air in the drying box is heated repeatedly, absorbs the moisture in the material, cools itself by humidification, and passes through the process of hot air dehumidification or condensation to remove water. The water in the water is drained away and finally the material is continuously dried.