食品包装袋的主要材料通常为塑料树脂，具体材质根据用途和安全性要求有所不同，以下是常见类型及特点：

　　The main material of food packaging bags is usually plastic resin, and the specific material varies depending on the purpose and safety requirements. The following are common types and characteristics:

　　1. 聚乙烯（PE）

　　1. Polyethylene (PE)

　　特性：无毒、无味、半透明或乳白色，耐低温但耐热性较差（熔点约100~130℃），广泛用于超市背心袋、保鲜膜等。低密度聚乙烯（LDPE）柔软性更好，高密度聚乙烯（HDPE）则更坚硬。

　　Characteristics: Non toxic, odorless, semi transparent or milky white, low temperature resistance but poor heat resistance (melting point about 100-130 ℃), widely used in supermarket vest bags, cling film, etc. Low density polyethylene (LDPE) has better flexibility, while high-density polyethylene (HDPE) is harder.

　　用途：水果、蔬菜、熟食等常温或低温食品包装。

　　Usage: Packaging of fruits, vegetables, cooked food and other food at room temperature or low temperature.

　　2. 聚丙烯（PP）

　　2. Polypropylene (PP)

　　特性：耐高温（160~170℃）、透明度高、无毒，适合微波加热，常用于面包、速冻食品包装。

　　Characteristics: High temperature resistance (160-170 ℃), high transparency, non-toxic, suitable for microwave heating, commonly used for packaging bread and frozen food.

　　用途：需高温处理的食品包装，如微波炉专用容器或热饮杯。

　　Usage: Food packaging that requires high temperature treatment, such as containers for microwave ovens or hot drink cups.

　　3. 聚氯乙烯（PVC）

　　3. Polyvinyl chloride (PVC)

　　特性：可能含增塑剂（如DEHA）和氯乙烯单体（VCM），高温下易释放有害物质，需谨慎使用。部分国家限制其用于直接接触油脂或高温食品。

　　Characteristics: May contain plasticizers (such as DEHA) and vinyl chloride monomer (VCM), which can release harmful substances at high temperatures, and should be used with caution. Some countries restrict its use for direct contact with fats or high-temperature foods.

　　用途：非直接食用食品的外包装（如蔬菜捆扎），但需避免接触油脂或加热。

　　Usage: The outer packaging of non food for direct consumption (such as vegetable bundling), but should avoid contact with oil or heat.

　　4. 聚偏二氯乙烯（PVDC）

　　4. Polyvinylidene Chloride (PVDC)

　　特性：高阻隔性，能有效保鲜，常用于火腿、熟食等需长期保存的食品。

　　Characteristics: High barrier properties, effective preservation, commonly used for foods that require long-term storage such as ham and cooked food.

　　5. 其他复合材料

　　5. Other composite materials

　　多层复合膜/袋：如BOPP/PE、PET/CPP等，结合不同材料的优势（如阻隔性、强度），用于液体包装、无菌食品等。

　　Multi layer composite film/bag: such as BOPP/PE, PET/CPP, etc., combined with the advantages of different materials (such as barrier properties, strength), used for liquid packaging, sterile food, etc.

　　添加剂与安全要求

　　Additives and safety requirements

　　生产过程中可能加入增塑剂、稳定剂、着色剂等，但食品级包装需符合国家标准（如GB 4806.7），确保无毒迁移。正规产品需标注“食品用”标识及QS认证。

　　Plasticizers, stabilizers, coloring agents, etc. may be added during the production process, but food grade packaging must comply with national standards (such as GB 4806.7) to ensure non-toxic migration. Legitimate products must be labeled with the "food use" label and QS certification.

　　注意事项

　　Precautions

　　避免用普通塑料袋盛装高温（>50℃）或油脂食品，以防有害物质析出。

　　Avoid using ordinary plastic bags to store high-temperature (>50 ℃) or oily food to prevent harmful substances from precipitating.

　　微波加热应选用标有“微波炉专用”的PP材质包装。

　　Microwave heating should be packaged in PP material labeled "microwave oven specific".

　　如需更详细的技术参数或检测标准，可参考相关食品安全国家标准。

　　For more detailed technical parameters or testing standards, please refer to relevant national food safety standards.

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