Effect of extruder speed, steam pressure temperature, spiral, die hole, hot and cold discharge on bulk density (moisture content, raw meal production, over-expansion)
1. If the modulation speed is too fast, the residence time in the modulator is too short, the modulation is not enough, and the bulk density is easy to cause the bulk density to exceed the standard; if the modulation speed is too slow, the residence time of the material in the modulator is too long, modulation Excessive puffing, puffed corn appears white, losing nutritional value.
2. If the steam pressure temperature is too high, the corn flour is over-expanded, the expanded corn appears white, and the nutritional value is lost; if the steam pressure temperature is too low, the corn flour is not puffed enough, resulting in high raw meal and moisture content (contact puffing) Machine principle analysis).
3. If the spiral pitch and the pore diameter of the die hole are too large, in the expansion, the pressure is insufficient to cause insufficient expansion, and the raw powder and moisture content are too high (in connection with the principle of the extruder); the spiral pitch and the pore diameter of the die are too small, and the puffing is performed. Excessive medium pressure leads to excessive expansion, and the expanded corn appears white, losing its nutritional value.
4. Puffed corn cold discharge (large fan air volume, long cooling time), the moisture content will be lower; puffed corn heat discharge (small fan air volume, short cooling time), it is easy to lead to excessive moisture content.
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