Hot drink paper cups and cold drink plastic cups . But many people will have this experience: when buying milk tea or some other hot drinks, the clerk will use a plastic cup to hold and plastic cups to cover cups. Does such a drink have an impact on our health?
The Quality Supervision Bureau has proposed a possible “risk warning” for health and safety. Food grade plastics with general certification can be used for food packaging and are harmless to the human body. Commonly used plastics, polystyrene (PS), because of its excellent insulation, insulation and transparency, are often used as materials for hot drinks cups and lids, lunch boxes and meal lids, but this material is not resistant to high temperatures. At present, food packaging equipment made of polystyrene resin should meet the requirements of the mandatory national standard GB 9689-1988 "Sanitary Standard for Polystyrene Moldings for Food Packaging", but this standard lacks the testing items for food contact under high temperature conditions. (We have recommended that the National Standards Committee carry out research to increase the GB 9689-1988 "Sanitary Standard for Polystyrene Moldings for Food Packaging"). Polystyrene has a heat distortion temperature of 70℃to 100℃, which may accelerate the decomposition of toxic polymer monomers under heat, and then migrate to foods, endangering human health.
But consumers don't have to panic. Because the vast majority of hot drinks that can be held in your hand are only around 60℃, so that they do not let them break down toxic substances. Consumers should identify safe materials when choosing plastic products related to food. It is a good way to identify safe plastic products by looking for the blue and white "QS" logo. Second, we must use it scientifically. Take the No. 6 plastic, don't pretend to boil water, don't use a microwave to heat it. The healthier way is to put a hot drink that is less than 90℃ and don't cover the lid for a long time to avoid the hot steam dissolving toxic substances and returning. Into the cup. No. 5 plastic polypropylene (PP) with higher heat resistance is better than No. 6 under certain conditions. The color of the lid is also very particular. It is best to choose white or transparent. Do not choose black or colored. Many black or colored plastic cup lids are made from scraps in the workshop or have been added with toner or masterbatch during the production process. It is likely to use discarded plastics and it is safe and unsafe.
Here, the meaning of the number of plastic products is popularized to consumers in order to select suitable plastic products in daily life. On the bottom of the plastic vessel, on the plastic cup lid or other obvious areas, there is a triangular sign with a number inside, which is the number of the plastic product.
"No. 1" PET. Mineral water bottles and carbonated beverage bottles are made of this material. They are heat resistant to 70℃. They are easily deformed when they are filled with high temperature liquid or heated, and they are harmful to the human body.
"No. 2" HDPE (High Density Polyethylene). Common in medicine bottles, cleaning products, bath products, not suitable for use as a water cup.
"No. 3" PVC (polyvinyl chloride). It is easy to produce two kinds of toxic and harmful substances, and it has been used less for packaging foods. It is best not to buy or use.
"No. 4" LDPE (low density polyethylene). Preservative film, plastic film, etc. are all such materials, heat resistance is not strong, more than 110℃ will appear hot melt phenomenon, leaving some plastic preparations that the human body can not decompose.
"No. 5" PP (polypropylene). The microwave lunch box is made of this material and is resistant to high temperatures of 130℃. It is a plastic box that can be placed in a microwave oven and can be reused after careful cleaning.
"No. 6" PS (polystyrene). It is also heat-resistant and cold-resistant. It is used to make bowls of instant noodles boxes and foamed snack boxes. The heat distortion temperature is 70℃-100℃. If the temperature is too high, chemical substances may be precipitated.
"No. 7" PC and other classes. A material that is used in large quantities, mostly used in the manufacture of kettles, cups, bottles, etc., is controversial because it contains bisphenol A.