Paper can be folded for writing, printing, packaging, hygiene and other purposes. The paper used for food packaging and containing food is machine-made paper (paper produced in a mechanized manner). The raw materials for paper-making are mainly plant fibers. In addition to the three main components of cellulose, hemicellulose, and lignin, the raw materials have other components with less content, such as resin and ash. In addition, there are auxiliary components such as sodium sulfate.