The number at the bottom of plastic products becomes a quality wind vane
we always come into contact with all kinds of plastic products in our life, but which of these plastic products can be heated and which can be used repeatedly? This is when the numbers at the bottom of plastic products come into play
plastic bottles become a habit of repeated use
because repeated use saves money and is cost-effective, various mineral water bottles and beverage bottles have become essential items in many citizens' kitchens. Some of these plastic bottles are used to hold condiments such as vinegar and soy sauce, and some are filled with hot water to become "portable water cups"
every morning, there is a long line in front of the purified water intake machine in Cuiwei Nanli. Residents come to collect water with large and small plastic buckets. Some people have deformed plastic buckets in their hands
Aunt Liu, a citizen who has just received water, said that the two plastic buckets she used to receive water were originally filled with edible oil. She used them for more than a year and used them to draw water almost every day. These two bucket bottom numerical codes are marked with "1". When asked if she knew that using this kind of plastic bottle was bad for her health, she looked very surprised: "never heard of it."
in roadside snack stalls and stalls, plastic bottles are directly used to hold all kinds of seasonings. In a snack bar near Liuliqiao, I saw that the containers containing vinegar, soy sauce, pepper and sesame oil in the shop are all reusable mineral water bottles. "Everyone uses this. We've cleaned it before, no problem." The service staff in the store said
ordinary people think it's common, but in the view of industry experts, there are many health risks hidden here. "Although qualified beverage bottles and mineral water bottles are required to be made of food grade plastic, repeated use is still detrimental to health." Dongjinshi, vice president of the China plastics recycling professional committee, said that mineral water bottles and beverage bottles are disposable products, and the state clearly stipulates that they cannot be filled and used repeatedly
according to Dong Jinshi, many mineral water bottles and carbonated beverage bottles that are not marked or marked with "1" are made of pet (polyethylene terephthalate). The materials of these beverage bottles can degrade in acidic, alkaline and steam environments, and the degradation products are harmful to health, so vinegar, soy sauce and other condiments cannot be contained. Moreover, it cannot withstand high temperatures above 70 ℃, otherwise the bottle body is easy to deform and can dissolve substances harmful to human body. After 10 months of use, the carcinogen DEHP may be released
plastic bottle bottom marks are mostly fake
although they were made with aluminum foil in the past, since 1996, China has begun to use triangular digital symbols as plastic recycling marks, which are generally engraved on the bottom of plastic containers to distinguish plastic materials and remind consumers to use them differently, but few people really pay attention to these bottle bottom marks
according to experts, there are six common signs of plastic containers on the market at present. The bottom of plastic bottles of milk, fruit juice, mineral water and other beverages are mostly marked with the number "1", the bottom of plastic bottles of barreled edible oil and cosmetics is marked with the number "2", the packaging such as fresh-keeping film is marked with the number "4", the bottom of space water cup and Le Kou tableware is marked with "5", the plastic raincoat umbrella is marked with the number "3", and the bowl of instant noodles The snack box is marked with the number "6"
"I have never noticed that there are digital signs at the bottom of mineral water bottles." At Cuiwei store of Hualian Supermarket, Miss Liu, a white-collar worker, felt very fresh when she saw the sign on the bottom of the plastic bottle. As for the use of different plastic products, she only knows that mineral water bottles cannot be directly filled with boiled water, and foods with preservative films cannot be heated in microwave ovens. As for yield stress, which is an important indicator to measure the strength of materials, she does not understand the reason
in the random interview, consumers like Miss Liu accounted for the vast majority. They either didn't notice the signs on the bottom of the plastic bottle at all, or didn't know the meaning of these numbers at all
not only consumers don't know the meaning of these digital signs, but also sellers know a little about them. "This' 1 'should represent the service life of plastic bottles. This mineral water bottle can last for one year." The explanation of the salesperson in the beverage area of Carrefour supermarket made me laugh and cry. "The lunch box marked with 5 can be directly heated in a microwave oven, but others can't." Even in the Le Kou specialty store, which specializes in selling plastic tableware, salespeople are also confused about the differences between different digital signs
different labels have their own uses.
"not only can mineral water bottles not be reused, consumers should also be careful when using other plastic containers." Dong Jinshi introduced that the creep property of ABS at the bottom of plastic bottles is higher than that of PSF and PC. there are different numerical numbers inside the big corner, representing different plastic materials and uses
among them, "1" pet (polyethylene terephthalate) is commonly used in the production of mineral water bottles and carbonated beverage bottles, but its heat resistance is only 70 ℃, it is easy to deform when it is filled with high-temperature liquid or heated, and substances harmful to human body are dissolved, so it cannot be placed in the car in the sun, and it cannot be filled with alcohol, oil and other substances
"2" HDPE (high density polyethylene) is mostly used for cleaning products and bath products. These containers are usually difficult to clean and easy to become a hotbed of bacteria
"3" PVC (polyvinyl chloride) is generally not used to package food, and harmful substances are easy to be produced at high temperature. If used, do not be heated
the fresh-keeping film and plastic film are mostly made of "4" LDPE (low density polyethylene), which is not strong in heat resistance, and must be removed when heating in microwave oven
"5" PP (polypropylene) lunch box is the only plastic lunch box that can be put into the microwave oven, but it is best to remove the cover before putting it into the microwave oven
bowls of instant noodles and fast food boxes made of "6" PS (polystyrene) cannot be used to contain strong acids and alkaline substances, and fast food boxes should be avoided as far as possible to pack hot food
"for example, although product transformation is important, consumers cannot distinguish plastic materials. It is better to use bottles made of glass, stainless steel and other materials to pack food, which is relatively safe." Dong Jinshi suggested
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