1"pet (polyethylene terephthalate): mineral water bottles, carbonated beverage bottles, etc. Don't recycle the hot water in the beverage bottle. Usage: Heat resistant to 70℃, only suitable for warm or frozen drinks. It is easy to deform when filled with high-temperature liquid or heated, and there are substances harmful to human body. Moreover, scientists have found that after 1 plastic products are used 10 months, DEHP, a carcinogen, may be released, which is toxic to testicles.
"2" HDPE (high density polyethylene): cleaning products and bath products. If the cleaning is not thorough, it is recommended not to recycle. Usage: It can be reused after careful cleaning, but these containers are usually not easy to clean, leaving the original cleaning supplies and becoming a hotbed of bacteria. It is best not to recycle.
"3" PVC: It is rarely used for food packaging at present, so it is best not to buy it. Usage: this material is easy to produce harmful substances at high temperature, and even it will be released during manufacturing. Toxic substances enter the human body with food, which may cause diseases such as breast cancer and birth defects of newborns. At present, containers made of this material are rarely used for packaging food.
"4" LDPE: cling film, plastic film, etc. Don't wrap the plastic wrap on the surface of food and put it in the microwave oven. Uses: heat resistance is not strong. Generally qualified PE plastic wrap will melt when the temperature exceeds 1 10℃, leaving some plastic preparations that cannot be decomposed by human body. Moreover, food is wrapped and heated with plastic wrap, and the oil in food can easily dissolve the harmful substances in plastic wrap.
[5] PP: microwave lunch box, when put into the microwave oven, remove the lid. Usage: The only plastic box that can be put into the microwave oven can be reused after careful cleaning. It should be noted that some microwave lunch boxes are indeed made of No.5 PP, but the lid is made of No.0 PE/kloc-0. Because PE is not resistant to high temperature, it can't be put in the microwave oven with the box.
"6" PS: instant noodle box in bowl, fast food box. Don't cook bowls of instant noodles in the microwave oven. Usage: Heat-resistant and cold-resistant, but it can't be put into the microwave oven to avoid releasing chemicals when the temperature is too high. And it cannot be used to load strong acids (such as orange juice) and strong alkaline substances, because it will decompose polystyrene which is unfavorable to human body and easy to cause cancer.
Other categories of "7" PC: kettle, water cup and milk bottle.
Extended data
The process of manufacturing barrier plastic bottles by coating technology has shown a downward trend, and German Crance AG and American Tetra Pak (Illinois) Company have started to reduce their production scale.
Crance Company and Coca-Cola Company jointly developed the BestPET technology, and coated the outer surface of the bottle with a coating containing silicon oxide. A spokesman for the company claimed that this technology is outdated due to high cost and insufficient oxygen barrier performance, and Tetra Pak has also terminated the research on Glaskin silicon dioxide plasma coating system applied to the inner wall of PET bottles.
Italy SIPA Company has specially developed a new barrier dip coating material with the trade name of Smart Coat. The technological process is as follows: after the bottle is obtained by blow molding, it is dip-coated, then immediately put into an infrared oven for rapid drying, then coated for the second time, and then cured under ultraviolet radiation. A standard dipping equipment can handle about 65,438+02,000 plastic bottles per hour.
One of the applications of this PET bottle is to fill carbonated drinks. According to the company, the shelf life of packaged goods with 0.5 liter capacity and single-purpose dip-coated PET bottles can be as long as one year, while the shelf life of goods without dip-coated PET bottles is only seven weeks.
British Innovative Plastics Technology Company (AFT) has developed a patented water-based flow coating process, which can coat the outer surface of bottle blanks made of special barrier thermoplastic resins. After the coating process, the resin is cured, and the bottle blank can be stretched and blow-molded twice on standard processing equipment.
APT claims that compared with uncoated PET bottles, this coating process can improve the barrier performance to CO by 3-4 times. Haschi is negotiating with APT to transfer technology to obtain a business license to manufacture the coating equipment, which has a design capacity of handling 30,000 bottle blanks per hour.
This technology has been purchased by a leading beverage manufacturer and applied to the processing of non-alcoholic beverage packaging bottles.
The Institute of Plastic Processing (IKV) of Aachen University in Germany has transferred —PECVD, a plasma spraying technology for the inner wall of plastic bottles, to Sidel. IKV has also developed the outer wall coating technology of plastic bottles, which adopts a barrier coating of 20- 150nm, similar to the inner wall coating process, which can improve the CO barrier performance of PET bottles by four times, and the processing cycle of its technical production system device is 15 seconds.
The development goals set by the researchers are: shortening the processing cycle within 10 second, applying more powerful vacuum pumps and other improved detection equipment.
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