The difference between chengmian and raw flour lies in their different uses. Chengmian is a kind of wheat starch, which can be used to make other snacks and food, while raw flour is a kind of seasoning, which is mainly used in sizing or thickening of food.
Chengmian, also known as Chengfen and wheat starch, is mainly composed of gluten free flour of wheat. It is the main raw material for all kinds of snacks and food. Shrimp dumplings and intestinal flour commonly used in life are made of chengmian.
Raw meal is a kind of corn starch, which is often used as a seasoning, which can make food produce a smooth taste. It can also be used to spread pancakes with raw meal to wrap the surface of meat and other food to increase the taste of food.
Chengmian is also a kind of starch, but raw starch. It can be eaten directly or processed into other products. Raw flour is a kind of seasoning, which is used for sizing and thickening food, or spreading pancakes and making jelly.