High-temperature cooking bags are an indispensable form of packaging in modern food processing, storage, and transportation. They are mainly used for packaging foods that require high-temperature cooking treatment, such as canned foods. When selecting materials for high-temperature cooking bags, it is necessary to consider their ability to withstand high temperatures, maintain food freshness, be non-toxic and harmless, and environmentally friendly. Below are some common materials for high-temperature cooking bags and their characteristics:

1. Polyethylene (PE): Polyethylene is a commonly used plastic material with good high-temperature resistance, capable of withstanding high-temperature cooking. Additionally, it has good flexibility and moisture resistance, ensuring the freshness of the food.
2. Polypropylene (PP): Polypropylene is a semi-crystalline plastic with high heat resistance and chemical stability. During high-temperature cooking, it provides good protection and is non-toxic and odorless, causing no adverse effects on food.
3. Polyamide (PA): Also known as nylon, it has excellent high-temperature and cooking resistance, as well as good toughness and mechanical strength. Polyamide materials are usually used in combination with other materials to make high-temperature cooking bags.
4. Aluminum foil: Aluminum foil is an excellent barrier material that effectively blocks oxygen, moisture, and light. During high-temperature cooking, aluminum foil can effectively protect the freshness and taste of food.
5. Paper-plastic composite materials: This material is usually a composite of paper and plastic layers. They have good high-temperature resistance, mechanical strength, and printability. Additionally, paper-plastic composites have good environmental performance.

When selecting materials for high-temperature cooking bags, factors such as the type of food, cooking time, temperature, and shelf life must also be considered. For example, foods requiring long-term high-temperature cooking should use materials with better heat and cooking resistance. Moreover, to ensure food safety, the selected materials must comply with relevant national standards and regulations, and harmful additives should be avoided during production.

In summary, the selection of materials for high-temperature cooking bags should comprehensively consider various factors, including heat resistance, food safety, environmental friendliness, and cost. Common materials include polyethylene, polypropylene, polyamide, aluminum foil, and paper-plastic composites.