Nowadays, due to the plastics restriction order issued by the country and the growing demand for health and environmental protection, green and environmentally friendly paper packaging is widely used in people's daily life. For example, food-grade paper packaging applications, food packaging bags are widely used, ranging from oil-proof paper bags and snack bags at food stalls, to food packaging, paper pads, and takeaway bags such as McDonald's KFC. And from the traditional style with a single color to the present, the style is diverse and the printing is exquisite. So, what kind of paper is used to make food paper packaging used in the food market?