Sweet potato drying steps: First, the preliminary work first sweet potatoes cleaned, and then carried into the boiler cooking. In about seven or eight mature sweet potato when it is taken out, and so cool down before manual sectioning. In sliced ??session, we must first ensure uniform thickness, and secondly, try not to let the sweet potato slices specifications that much difference. After these steps completed, it will cut sweet potato pieces into place on the shelf materials. Achieve uniform thickness, neatly Second, the drying process 1. Oven temperature was raised to be about 30 ℃, the sweet potato pieces into the drying room inside. Setting temperature of 40 ℃. Drying time is one to two hours. 2. The temperature was set to 55 ℃. Drying time is two hours. 3. The temperature was set at 65 ℃. Drying time is two hours. The temperature was set at 70 ℃. Drying time was one hour. 5. Turn off the power, remove the material in an hour. Third, the packaging into the bag after removing the material needed to be completely cooled sweet potato slices before packing into the bag. Overall, a batch drying time is about eight hours, the maximum temperature does not exceed 70 ℃. Kincaid heat pump dryer features: 1, easy installation: install, easy to demolition, small footprint, can be installed in indoor and outdoor; 2, efficient and environmentally friendly: just a small amount of electrical energy consumed, it can absorb a lot of heat in the air power consumption is only electric heater 1 / 3-1 / 4; compared with coal, oil, gas water heater, can save about 75% of operating costs. 1 kWh of electricity is equal to 4. 3. Environment friendly: without any combustion and emissions, is a sustainable development of environmentally friendly products. 4, safe and reliable: the existing dangers run the whole system without the traditional dryer (oil, gas or electric heating) in the flammable, explosive, toxic, short circuit, it is an absolutely safe and reliable semi-closed drying system. 5, long life, low maintenance costs: in the technical basis of the traditional air-conditioning evolved, mature technology, stable performance, reliable, long life; safe and reliable operation, automatic free manual operation, intelligent control. 6, comfortable and convenient, automated, high intelligence: A thermostat-controlled, 24-hour continuous drying operation. 7, wide application, not climate: It can be widely used in food, chemical, pharmaceutical, paper, leather, wood, agricultural processing and other industries, heating and drying operations.