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High Quality Baby Nutritional Powder Food Mini Extruder China Manufacturers: Professor of food science at furen university pointed out that to understand the effect of puffing, we need to start with the principle of popcorn. Popcorn raw material for the shell hard dry corn kernels and function like a pressure cooker.
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Life of the common food, you must have eaten, but don't know how it is prepared, its name is called puffed food, although it sounds strange, but in different stages of life, you have tasted it xiang xiang crunchy: baby rice cakes, breakfast cereal chip, party activities, snacks, dating the movies to eat popcorn, rice cakes, and even a wedding reception is it one of the hundreds of different appearance, when the voice of the card zi zi in the ears, you taste is not only a snack, but also full of memories.
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So called puffed food, basically be raw material with cereal, potato kind or legume, classics pressure, heat or squeeze wait for a way to make, make food organization structure and volume change, present porous and fleabiness mouthfeel. But what kind of magic does puffing have that can turn ordinary corn, wheat, potatoes, rice and other raw materials into round, triangular, spiral and star shapes that taste crisp and crisp?
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When heated, corn kernels internal water is heated, the pressure gradually increased, shell weaker as pressure on export, the hot water due to lower the pressure at the exit, turns into steam and expansion, open shell, corn and joint corn kernel starch pasting and become soft and colloidal particles in the batter push out.
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Because there is more than one instant expansion of water vapor inside the corn kernels, they are like small bombs inside the corn, which explode outward at the same time, causing many small bubbles inside the corn tissues and increasing the overall volume. When the corn explodes, the bubbles fuse, cool and solidify, and the steam evaporates at the same time, reducing the moisture content and turning the moist, gelatinous batter into beautiful, white popcorn.
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As a result, the starches and water are heated, and sometimes pressurized, so that the water vapor between them pushes apart the whole structure of the food (the popcorn pop). Common street Fried rice incense is also made with the same principle, the difference is that Fried rice incense does not have a hard shell, the source of pressure is a special pressure cooker. The unique pound sound effect of rice explosion incense is because when the pressure cooker is opened, the pressure in the pot is suddenly released, and the moisture in the rice grain is instantly converted into gas, and the internal high-pressure gas is too late to release the sound produced.
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Food processing plants produce a wide range of bulk food, mainly with extruder. The extruder is different from the pressure cooker of rice explosion incense, it can accept granule or powdered raw materials, and combined with stirring, kneading, cooking and other functions, but also can use different mold holes to make animals, letters and other three-dimensional shapes. Puddings can be made without preservatives to lengthen their life, as they are also heated to kill bacteria and contain less water. According to the production method, puffed food can be further divided into direct and indirect forms:
Direct extrusion puffing, common products such as darling, corn cobs. When the raw material is stirred by the rotating shaft of the machine, the high temperature and high pressure required for expansion are provided in a short time by means of rapid shear friction or steam heating. Then the material is extruded through the mold holes of a specific shape and cut into the desired shape by a cutter. Extrusion out of the material will be because the external environment for normal temperature and pressure, and achieve fluffy effect. Later with baking and drying, can make the product more fragrant, pine, crisp, crisp.
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