Plastic packaging bags, how much do you know?

  Around us, plastic bags can be seen everywhere, convenient for our lives. But do you really understand it? Which materials are they made of? Which can be used to hold food? Consumers and how to buy safe and high-quality plastic bags?

    Talking about plastic food bags, we often come into contact with the main plastic shopping bags and food plastic pre-packaged bags, this article is mainly for consumers who commonly used plastic shopping bags to answer the above-mentioned several common questions.

    1. Classification of plastic bags and materials

    Plastic bags are divided into ordinary plastic bags, biodegradable plastic bags, starch-based plastic bags, and direct contact with food plastic bags. At present, the main material used for food plastic bags is PE-HD, PE-LD, PET, etc. Other materials can be used as additives in limited quantities.

    2. Identification of plastic bags

    Different materials of plastic bags have their appropriate use, but not all are suitable for holding food. How should you distinguish the material used in these bags? You must pay attention to the logo on the bag.

    (1) "for food" logo

    Direct contact with food plastic bags should be marked with the words "for food". That is, no "food" logo plastic bags can not be used to directly hold naked food, such as cooked food.

    (2) "recycling" logo

    The recyclable logo is a triangular symbol, representing that it can be recycled. The logo in Figure 2 indicates that the plastic bag is made of recycled plastic, not for holding food.

    (3) material identification

    Table 1 plastic bags commonly used in the material gives their corresponding abbreviation and uniqueness code, such as PET on behalf of polyethylene terephthalate.

    In the case of recyclable materials, there will be a numerical label inside the triangular logo to indicate the material used, and if the product is made of several different materials, its logo should be the main, basic material of the product. In addition, the packaging will also see > PVC-P (DBP) < such a logo, PVC represents the main material is polyvinyl chloride, and the symbol P and the characters in the garden brackets indicate the type of processing aids used.

    3. Notes on the use of food plastic bags

    A wide variety of plastic bags on the market, but the quality varies, how consumers should choose food plastic bags to ensure their safety? The following is a brief description of the selection and use of plastic bag precautions.

    (1) purchase technical indicators in line with national laws and regulations and relevant standards of packaging materials, ordinary plastic bags can not replace food packaging plastic bags; avoid the use of unmarked, colored plastic bags to hold food, such as some vegetable markets used to fill fish, shrimp and other aquatic products or meat black plastic bags, etc.

    (2) in the purchase of food plastic bags, available to see the appearance, smell, feel, and other simple methods to identify the merits of plastic bags.

    A look at the appearance: the bag is cloudy, with impurities is likely to be processed with recycled plastic inferior products, and should not hold food;

    Second smell: smell the odor, the strange smell is mostly poor quality products, more additives, or recycled plastic.

    Three feel: if the hand feels sticky feeling is mostly inferior; in addition, plastic bags can be easily torn more than the use of recycled plastic made.

    (3) try to avoid direct contact with high grease and high-temperature products, and different materials and plastic bags have different precautions for use. For example, PE-HD, the current supermarkets, and shopping malls use plastic bags are mostly made of this material, can withstand 110 ℃ high temperatures, are marked "food" and can be used to hold food; cling film, plastic film, etc. is mostly PE-LD material, its heat resistance is not strong, more than 110 ℃ will appear hot melt phenomenon; PET material Plastic packaging, its heat resistance index is not higher than 70 ℃, not suitable for high temperature or heating products, and should not be used repeatedly for a long time.

    (4) If conditions allow, consider using paper bags instead of plastic bags that meet food standards.