Blunt knife is good. Most soybean milk machines on the market use blunt blades mainly because blunt blades are the most functional, high applicability, crushing high toughness, high hardness ingredients are easier. Soymilk machine blades can be divided into blunt blades, serrated blades and fast (sharp) blades in terms of shape. Blunt blades are used to crush hard ingredients, serrated blades are used to break up soft meat, and sharp blades are used to make fruit and vegetable juice.