The process principle and process of sweet potato starch processing:

First, the basic principle of cleaning

The function of cleaning: it is mainly to remove the silt from the skin of the sweet potato, and to remove the skin of the root of the sweet potato. Cleaning of fresh sweet potato or sweet potato dry slices as raw material for producing starch is the basis for ensuring starch quality. The better the quality of starch is, the better the quality of starch will be.

Two. The basic principle of the broken solution

The effect of crushing: sweet potato starch is stored mainly in the fleshy part of the root tuber, only a small amount is stored in the endothelium. The purpose of the breakage is to destroy the tissue structure of the sweet potato, so that the tiny starch granules can be successfully separated from the root of the tuber. The starch that is released from the cell is called free starch; it is called the binding starch in the residue inside the cells.

Comminution is one of the most important processes in the processing of fresh sweet potatoes. It is related to the powder yield of fresh sweet potatoes and the quality of starch. The requirements for crushing are:

1. as much as possible, the cells of fresh sweet potatoes were broken and more free starch granules were released.

2. is easy to separate. Do not want to peel pomace or too small, is not conducive to starch separation and other ingredients, and increase the difficulty of separation of fine slag.

Three, the basic principle of sieving

Sweet potato residue is a slender fiber volume greater than the starch particles, expansion coefficient is larger than Peng starch granules, the proportion of light in starch granule, the breaking of the puree, with water as the medium, the potato residue containing starch further filtered water.

Four, the basic principle of purification and precipitation of starch pump

Mud and sand is greater than the proportion of water is greater than the proportion of starch granules, according to the principle of proportion of separation, using cyclone sand, or use the chute sedimentation method can achieve the ideal effect. The yellow pulp proportion, close to water, and the ratio of starch granules in the shape of light weight, long processing cycle more hand, performance more sticky stick sieve, starch granules, and very difficult to separate, so the requirements of fresh raw materials, short process, timely separation.

Five. The basic principle of dehydration

The concentrated starch slurry still contains more water and is further dehydrated to dry.

Six. The basic principle of drying

Starch is commonly used for air dry starch factory (also called flash drying) the entire process is completed in time for a moment, so the moisture not gelatinization of starch granules has been dry, so it won't happen pasting or degradation phenomenon.

The air drying is the process of the flow drying, which consists of two processes of heat transfer and mass transfer, which are the process of the wet powder material and the flow process of the hot gas flow. When the wet starch is in contact with the hot air, hot air heat transfer to the surface of the wet starch, transferred to the internal surface, this process is the process of heat transfer; at the same time, the wet starch in water from the material to liquid or gaseous diffusion to the surface of starch, starch by surface by gas film diffusion to heat the air to this is a mass transfer process. It is the heat exchange between the high temperature air and wet starch in the dry tube, which makes the dried starch powder and can be packed into storage after cooling.

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