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Drying Sweet Potatoes

Sweet potato drying machine, Sweet potato dehydrator


Sweet potato

The plant is a perennial herbaceous vine with alternating heart-shaped or palm-shaped lobed leaves and medium-sized alternate flowers. The edible tuberous roots are long and tapered, with smooth skin and a color between yellow, orange, red, brown, purple and beige. Its skin color ranges from beige to white, red, pink, purple, yellow, orange and purple. Sweet potato varieties with white or light yellow flesh have lower sweetness and humidity than sweet potato varieties with red, pink or orange flesh.


Sweet potato is native to the tropical regions of the Americas. Among the approximately 50 genera and more than 1,000 species in Convolvulaceae, sweet potato is the only significant crop, and some other plants are used locally (for example, aquatic potatoes), but many are toxic. Sweet potato containing sweet potato also includes several garden flowers, called morning glory, although the term usually does not extend to sweet potato. Some cultivars of sweet potato are planted as ornamental plants under the name of tuber morning glory for horticulture.


Sweet potato is also known as hawthorn, sweet potato, sweet potato, etc. Sweet potato is rich in protein, starch, pectin, cellulose, amino acids, vitamins and various minerals, and has the reputation of “longevity food”. The sugar content reaches 15-20%. It has anti-cancer, protects the heart, prevents emphysema, diabetes, and lose weight. In the Ming Dynasty, Li Shizhen's "Compendium of Materia Medica" recorded "sweet potato tonic, spleen appetite, strong kidney yin", and said that the people in the sea eat longevity. Chinese medicine regards sweet potato as a good medicine.

Sweet potato is a dicotyledonous plant belonging to the convolvulaceae or the morning glory family. Its roots are large, starchy, sweet and tuberous, and are root vegetables. Young leaves and twigs are sometimes eaten as green. Sweet potato is generally considered to be a potato (potato), but it does not belong to the Solanaceae family, but the two families belong to the same taxonomic order, namely the eggplant. Sweet potatoes, especially orange varieties, are often referred to as "yam" in parts of North America, but are botulinously distinct from real yam.



Sweet potato drying steps:


The first is the pre-treatment work: first clean the sweet potatoes, then put them into the boiler for cooking. Take out the sweet potato when it is about seven or eight mature, and wait until it cools before slicing. In the sectioning section, firstly, the thickness should be kept consistent, and it should be suitable in about 2 cm. After completing the above steps, the sweet potato chips can be placed in the material tray, so that the thickness is uniform and the arrangement is neat.


Specifically, the high-end sweet potato is required to do three steaming and three baking.

Peeling-cooking-cutting-drying-steaming-baking-steaming-baking, the warehouse is launched during the drying process, the sweet potato is dried, the sugar is separated, and dried.

Sweet potato slice dryer, drytech heat pump dryer use for drying sweet potato


Drying process:


1. First step, when the temperature of the drying room reaches 40 degrees, push the material cart filled with sweet potato chips into the drying room, set the target temperature to 40 degrees, and the time is 2 hours.

2. Enter the second stage, set the target temperature to 60 degrees, and set the drying time to 2 hours for continuous dehumidification.


3. In the third stage, the target temperature is raised to 65 degrees, and the drying time is set to 2 hours for continuous dehumidification.


4. Enter the fourth stage, set the target temperature to 70 degrees, set the drying time for 2 hours, and carry out continuous dehumidification. Generally, the humidity of the final sweet potato chips is kept at 16-18%, and drying can be completed.

5. After the shutdown, let the sweet potato chips cool naturally.

The entire drying time is generally around 12-14 hours.


Packing into the bag: Take out the dried sweet potato chips for bagging. It is best to vacuum pack. The packaged sweet potato chips can be stored in a cool environment or can be refrigerated.


The production process of sweet potato is various, especially regional, so the drying parameters are also different. The rising air source heat pump dryer has a range of 10-75 degrees, and can set 10 drying time periods and different time periods. Adjustable, humidity controllable to meet the adjustment of different processes.



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Pre: Drying Red dates