Usually, for example, the paper used for food packaging also requires sanitation, sterility, no pollution and impurities, etc. It has been used in all walks of life and has a wide range of uses.

According to the function and use, packaging paper is divided into ordinary packaging paper, special packaging paper, food packaging paper, commodity printing packaging paper, etc.

General purpose: the base paper and paperboard for packaging with general packaging functions are usually made into cartons, partitions, paper bags and cartons, including paper bag paper, kraft paper, chicken skin paper, striped kraft paper, kraft cardboard, backing paper, box board paper, corrugated paper, honeycomb paperboard, etc.

Special: packaging paper with special functions for various environments, including oil proof packaging paper, moisture-proof packaging paper, rust proof paper, etc.

Food: packaging paper used for "packaging" in food, beverage and other fields, including food parchment, candy packaging base paper, etc.

This kind of packaging paper mainly requires high strength, heavy load resistance, impact resistance and appropriate air permeability. Food packaging paper has the most varieties and specifications. It is divided into two categories: inner packaging and outer packaging. Direct contact with food is called inner packaging paper. It is mainly required to be clean, free of germs, and has the characteristics of moisture-proof, oil-proof, anti sticking, mildew proof and so on. The outer packaging paper is mainly used to beautify and protect commodities. In addition to requiring certain physical strength, it also needs to be clean and beautiful, and is suitable for printing multi-color commodity patterns and characters. Packaging paper for milk, vegetable juice and other liquid drinks must also have excellent impermeability. In order to meet the needs of long-term preservation and preservation, special beverage soft packaging paper composed of paper and metal film, paper and plastic and metal film has been developed in recent years (see food packaging container). In order to meet the needs of anti rust of metal instruments and tools, anti rust paper was developed. Most of the paperboard is also used for commodity packaging. It is mainly used to manufacture cartons, cartons and packaging liners.

wrapping paper； packing paper

A general term for a class of paper used for packaging purposes. It can be divided into ordinary packaging paper, special packaging paper, trademark paper, oil-proof packaging paper and moisture-proof packaging paper. It usually has high strength and toughness. All kinds of packaging paper have different properties and uses. For example, special fruit wrapping paper is thin and soft. Photosensitive protective paper is opaque. Oil proof packaging paper (vegetable parchment, etc.) has oil penetration resistance. Moisture proof packaging paper (asphalt paper, oil paper, aluminum foil paper, etc.) has moisture resistance. Trademark paper is used for packaging after printing. Ordinary packaging paper is mostly used for general commodity packaging, and the quality requirements are not strict.

The commonly used technologies to improve the hydrophobic and waterproof properties of paper are surface coating, slurry sizing and surface sizing. Polyethylene and polypropylene are often used in commerce to improve the water resistance of paper through film coating technology, such as disposable paper cups, food packaging boxes and bags. In paper making industry, AKD emulsion is often used to improve the water resistance of paper by sizing process, but there are problems such as difficulty in recovering paper and difficult degradation. Surface sizing can give the paper excellent hydrophobic and waterproof properties. Compared with the above paper modification technology, it improves the rolling ability of water droplets on the paper surface, improves the waterproof and durability of the paper, solves the problem of recycling, and can achieve an effect comparable to that of plastics.