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Screw extrusion method | New economical preparation method of pregelatinized starch

2022-07-27

Pre-gelatinized starch is a kind of physically modified starch that is pre-gelatinized and then quickly dried in cold water and can be swelled into a paste by water absorption, also known as α-starch. Compared with native starch, pregelatinized starch has the characteristics of being swollen into paste in cold water, which is convenient to use, can improve food taste, save heating and cooking steps, and improve bonding properties. It is widely used in food, medicine, chemical industry, and feed. , foundry, oil drilling, textile, paper and other industries.
The raw materials of pregelatinized starch are mainly starch, such as corn starch, tapioca starch, potato starch, waxy corn starch, wheat starch, etc.
The preparation of pregelatinized starch includes several process routes of starch gelatinization-drying-pulverizing-sieving-packaging. The production process of pregelatinized starch is divided into roller method, extrusion method and spray method.
The production process of Arrow mechanical modified starch production line is extrusion method. Mainly divided into batching → mixing → extrusion puffing → drying → crushing → packaging and other processes
Screw extrusion method

Process introduction: The starch, water, additives, etc. are mixed evenly, and the internal molecular structure of the starch is changed after extrusion and expansion by a twin-screw extruder. After drying and dehydration in a dryer, it is finally pulverized and pulverized into powder with a specific fineness. . This is the modified starch we use now. In different industries, the raw materials and proportions of modified starch are also inconsistent. Arrow Machinery can select the equipment and adjust the formula for you according to the different needs of customers.

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