Convenient bags are the most common packaging for our daily shopping. They are the main component of white pollution. The main material is polyethylene film, which is what we call plastic, so it is also called a plastic bag.
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Toxicity identification of convenience bags
Commonly used food convenience bags are mostly made of polyethylene film. The film is non-toxic and can be used to hold food. There is also a film made of polyvinyl chloride. PVC itself is non-toxic, but the additives added according to the purpose of the film are often substances harmful to the human body and have a certain degree of toxicity. Therefore, this type of film and convenience bags made of this film are not suitable for holding food. If you want to identify polyvinyl chloride convenience bags and polyethylene convenience bags, you can use the following simple method to identify them.
Polyethylene film (non-toxic)
The film is milky white and translucent (especially obvious when several layers are stacked), and feels smooth, as if there is a wax layer on the surface. Shake it hard, the sound will be brittle, it will be flammable when exposed to fire, the flame will be yellow, mucus will drip when burning, and there will be the smell of burning candles.
Polyvinyl chloride film (generally toxic)
If no pigment is added, it will be transparent and the surface will feel sticky. If shaken hard, the sound will be low and it will not burn easily in case of fire. , it goes out as soon as it is away from the flame, and the flame turns green.
Edit this paragraph about the history of convenience bags
A photographer's experiments in the darkroom led to the creation of the original plastic. Alexander Parks had many hobbies, and taking pictures of convenience bags (4 photos) was one of them. In the 19th century, people were not able to buy ready-made photographic film and chemicals like they are today, and had to often make what they needed themselves. So every photographer must also be a chemist. One of the materials used in photography is "collodion," which is a solution of "cellulose nitrate", a solution of cellulose nitrate in alcohol and ether. It was used to adhere light-sensitive chemicals to glass to create the equivalent of today's photographic film. In the 1850s, Parks looked at different methods of processing collodion. One day, he tried mixing collodion with camphor. To his surprise, the mixture produced a hard material that was bendable. Parks called the substance "paxine," and it was the earliest plastic. Parks made a variety of items out of "Paxine": combs, pens, buttons and jewelry-printed accessories. However, Parks had little business sense and lost money on his business ventures. In the 20th century, people began to discover new uses for plastics. Almost everything in the home can be made from some form of plastic. It was left to other inventors to continue to develop and profit from Parks's work. John Wesley Hyatt, a printer from New York, saw the opportunity in 1868, when a company that made billiard balls complained about a shortage of ivory. Hayat improved the manufacturing process and gave "Paxin" a new name - "Celluloid" (fake ivory - translator's annotation). He found a ready market from billiard ball manufacturers and was soon making a variety of products out of plastic. Early plastics caught fire easily, which limited the range of products that could be made from it. The first plastic that could successfully withstand high temperatures was "Bakerite" (ie, phenol-coated plastic - translator's annotation). Leo Backlund received the patent in 1909. In 1909, Baekeland in the United States synthesized phenolic plastic for the first time. In the 1930s, nylon came out again. It was said to be "a fiber synthesized from coal, air and water, thinner than spider silk, harder than steel, and better than silk." Their emergence laid the foundation for the invention and production of various plastics thereafter. Due to the development of the petrochemical industry during World War II, petroleum replaced coal as the raw material for plastics, and the plastics manufacturing industry also developed rapidly.
Edit this paragraph about the hazards of convenience bags
Hazards
Plastic is a very light substance that can be softened by heating it at a very low temperature. , make things into various shapes as you like. Plastic products are brightly colored, light in weight, not afraid of falling, economical and durable. Its advent not only brings a lot of convenience to people's lives, but also greatly promotes the development of industry.
However, the invention of plastics was less than 100 years ago. If people were ecstatic about their birth at that time, now they have to take great pains to deal with these things that are full of life and pose a great threat to the human living environment. Plastics are chemical petroleum products derived from petroleum or coal and are difficult to degrade naturally once produced. Plastics will not decay and degrade even if they remain underground for 200 years. A large amount of plastic waste buried underground will destroy the permeability of the soil, cause the soil to harden, and affect the growth of plants. If domestic animals accidentally eat plastic mixed into feed or left in the wild, they can also die due to digestive tract obstruction. At present, China's annual plastic output is 3 million tons, and its consumption is more than 6 million tons. The annual output of plastics in the world is 100 million tons. If calculated based on 15% of the annual plastic waste, the annual plastic waste in the world is 15 million tons. The annual plastic waste in China is more than 1 million tons. The proportion of discarded plastics in the garbage The proportion accounts for 40%. Such a large amount of waste plastic is buried underground as garbage, which will undoubtedly bring greater pressure to the already scarce arable land. While plastics bring convenience to people's lives, they also bring troubles to the environment that are difficult to deal with. People call the disaster caused by plastics to the environment "oil pollution." At present, many countries use incineration (thermal energy These two methods allow waste plastics to be recycled and used to save resources. However, waste plastics will produce harmful substances when burned or reprocessed. Gas, pollute the environment, so it can be said that the disposal of waste plastics is still a major headache in environmental protection work
Comprehensive restrictions on use
The General Office of the State Council issued a notice on The "Notice on Restricting the Use of Plastic Shopping Bags in Production and Sales" requires all supermarkets, shopping malls, bazaars and other retail venues to implement a paid use system for plastic shopping bags. In addition, passenger trains, passenger ships, buses, etc. are not allowed to provide free plastic shopping bags. Airplanes, stations, airports and tourist attractions are also not allowed to provide ultra-thin plastic shopping bags (packaging bags) to passengers and tourists. Plastic shopping bags must be clearly marked with prices. Enterprises are encouraged to provide free cloth bags. Plastic shopping bags must be clearly marked with separate payment. The notice stipulates that commodity retail establishments are not allowed to provide plastic shopping bags for free or include them in the total price of goods. At the same time, relevant departments will formulate specific management measures for the paid use of plastic shopping bags in commodity retail establishments, and gradually form a market environment for the paid use of plastic shopping bags. The notice advocates carrying more cloth bags and vegetable baskets, reusing durable shopping bags, and reducing the use of convenience bags. At the same time, companies should also simplify product packaging and use more green and environmentally friendly packaging bags. The notice also encourages companies and social forces to provide free shopping bags. The masses provide reusable shopping bags such as cloth bags. The production and sale of ultra-thin convenience bags will be banned nationwide. From June 1, 2008, a tax policy will be formulated to curb waste plastic pollution. The production, sale, and sales of ultra-thin convenience bags will also be banned nationwide. Use plastic shopping bags with a thickness less than 0.025 mm (ultra-thin plastic shopping bags). Starting from June 1 this year, major shopping malls across the country will implement paid convenience bags. Customers must pay to purchase convenience bags, thereby prohibiting convenience bags. The proliferation problem.
Edit this paragraph Environmentally friendly convenience bags (hdpe)
The invention of convenience bags has brought great convenience to human life, but more and more people do not Knowing how to effectively use environmentally friendly bags has led to the globalization of bag pollution. We call on everyone to use environmentally friendly bags as much as possible to make our sky bluer and make their own contribution to traditional bags. Compared with the advantages it has: 1. The water-soluble speed can be designed and selected, completely dissolved in water, non-toxic and pollution-free; 2. Strong stretchability and good tension; 3. High transparency and good gloss; 4. High softness and touch Good; 5. Good oil resistance and solvent resistance, can be heat-sealed and printable; 6. Low air permeability coefficient, good gas barrier properties; 7. Plastic buckles or self-adhesive bags can be added; 8. Excellent antistatic properties, Do not vacuum etc. The most common packaging for daily shopping, the main component of white pollution