Knowledge of plastic packaging containers

"01" - PET (polyethylene terephthalate)

Mineral water bottles and carbonated beverage bottles are made of this material. Dong Jinshi pointed out that beverage bottles cannot be recycled and loaded with hot water. This material is heat-resistant to 70°C. It is only suitable for warm drinks or frozen drinks. It is easily deformed when filled with hot liquids or heated, and substances that are harmful to the human body are dissolved. Moreover, scientists have discovered that after 10 months of use, this plastic product may release carcinogens and be toxic to humans. Therefore, drink bottles, etc. should be discarded after they are used up. Do not use them as drinking glasses, or use them as storage containers for other items, so as not to cause health problems.

"02" - HDPE (High Density Polyethylene)

The plastic containers that hold cleaning products and bath products, and the plastic bags used in supermarkets and shopping malls are mostly made of such materials and can withstand high temperatures of 110°C. Plastic bags used for food can be used to hold foods. Plastic containers that house cleaning products and bath products can be reused after careful cleaning. However, these containers are usually not well cleaned, leaving the original cleaning products and become a hotbed of bacteria. The cleaning is not complete, and it is better not to recycle.

"03" - PVC (polyvinyl chloride)

According to reports, the toxic and hazardous substances that are easily produced by this plastic material come from two aspects: one is the monomolecular vinyl chloride that is not completely polymerized in the production process, and the second is the harmful substances in the plasticizer. Both of these substances are easily precipitated when they are exposed to high temperatures and fats. Toxic substances are prone to cancer when they enter the body with food. At present, the container for this material is already relatively small for packaging foods. Never use it if it is in use.

"04" - LDPE (Low Density Polyethylene) .... Road fans Note: We commonly use the kettle is generally the material and the material below, oh

Plastic wrap, plastic film, etc. are all of this material. The heat resistance is not strong. Usually, the qualified PE wrap will exhibit hot melting when the temperature exceeds 110°C, leaving some plastics that cannot be decomposed by the human body. In addition, food wrapped in cling film heats the fat in the food and dissolves the harmful substances in the cling film. Therefore, when the food is in the microwave, it is necessary to remove the wrapped plastic wrap.

"05" - PP (polypropylene)

Microwave lunch boxes made of this material, resistant to high temperatures of 130 °C, poor transparency, this is the only plastic box that can be placed in the microwave, can be reused after careful cleaning. It is necessary to pay special attention to the fact that some microwave lunch boxes and boxes are made of PP No. 05, but the lids are made of No. 06 PS (polystyrene). PS has good transparency but is not resistant to high temperatures, so it cannot be used together with the box. And put it in the microwave. To be on the safe side, remove the lid before placing the container in the microwave oven.

"06" - PS (polystyrene)

This is a material used to make bowl-type instant noodles and foaming snack boxes. It is also heat-resistant and cold-resistant, but it cannot be put into a microwave oven to avoid release of chemicals due to high temperatures. And can not be used to hold strong acid (such as orange juice), strong alkaline material, because it will break down the polystyrene is not good for the human body. Therefore, you should try to avoid packing hot foods with fast food boxes.

"07" - PC and other classes

PC is a material that is used in large quantities, and is particularly used in the manufacture of baby bottles, space cups, etc., because it contains bisphenol A and is controversial. Experts pointed out that theoretically, as long as the process of making PC, bisphenol A 100% converted into a plastic structure, it means that the product is completely free of bisphenol A, let alone release. However, if there is a small amount of bisphenol A plastic structure that does not convert to PC, it may be released into food or drink. Therefore, pay special attention when using this plastic container.

Residues of bisphenol A in the PC, the higher the temperature, the more the release, the faster the speed. Therefore, PC water bottles should not be used to hold hot water. If your kettle is numbered 07, the following methods can reduce the risk: Do not heat during use, do not shine in direct sunlight. Do not use a dishwasher or a dishwasher to clean the kettle. Before use for the first time, wash with baking soda powder and warm water and dry naturally at room temperature. If the container has any broken or broken, it is recommended to stop using it, because if there are tiny pits on the surface of the plastic product, bacteria can be easily hidden. Avoid repeated use of old plastic appliances.

The plastic recycling mark is a triangle symbol, generally at the bottom of the plastic container. There are 1 to 7 digits inside the triangle. Each number represents a different material. Therefore, different numbers in the recycling mark indicate which resin the product is made of. If the product is made of several different materials, The main, basic material of the product is marked. This set of signs originated in the United States and is now accepted and quoted by many countries including my country. In China, it is not mandatory for plastic products to be marked with recycling marks. Some regular big brand enterprises have recently begun to mark recycling marks in order to facilitate the recycling of plastic products.