There is a serious need to know what you think of paid plastic bags.

catalogue

Plastic bag raw materials

Plastic bag restriction

Harm of plastic bags

Forbidden country

Types of plastic bags

The use of plastic bags

The most common packaging in daily shopping, the main component of white pollution.

Edit this paragraph of plastic bag raw material.

Polyethylene (PE) for short. It is a high molecular organic compound formed by addition polymerization of ethylene. Polyethylene is recognized as the best material in contact with food in the world. Non-toxic, tasteless, odorless, in line with food packaging hygiene standards. Polyethylene film is light and transparent, with moisture resistance, oxygen resistance, acid resistance, alkali resistance, general air tightness and excellent heat sealing performance. Known as "plastic flower making". It is the most commonly used and important material for plastic packaging and printing.

PVC-polyvinyl chloride

The molecular formula of polyvinyl chloride (PVC) is (ch-ch) n, which is the most important vinyl polymer and the second largest plastic variety in the world after polyethylene. In China, the output ranks first among plastics. In the printing industry, PVC color calendering film and transparent glazing film are often used to make packaging and decoration of books, folders, tickets and other covers.

Shrinkage film

Shrinkfilm is a kind of thermoplastic film which is stretched and oriented in the production process and will shrink when it is treated with hot air or irradiated by infrared rays in the use process. After heat treatment, the film is tightly wrapped on the package, and the shrinkage force reaches the maximum in the cooling stage, which can be stored for a long time.

LDPE-low density polyethylene

Low density polyethylene (LDPE) is the most widely used variety in plastic packaging and printing industry in various countries. The specific gravity is 0.92 ~ 0.93, and it can float in water. The crystallinity is low (60%), and bulk polymerization is carried out under the pressure of 1000 ~ 3000 kg/cm ㎡, so it is also called high pressure polyethylene. At 23 degrees Celsius, the density is about 0.92. The calendering formability is poor, and it is suitable to be processed into tubular films by blow molding. Suitable for food packaging, fiber products packaging and daily chemical products packaging.

HDPE-high density polyethylene

High density polyethylene, HDPE for short. The density is 0.941~ 0.965g/cm3. It is made by low-pressure polymerization, so it is also called low-pressure polyethylene. It is milky white, indicating poor gloss. The film can be processed by blow molding and T-die extrusion process. Heat and cooking resistance, cold and frost resistance, moisture-proof, gas-proof, good isolation performance, not easy to break, and its strength is twice that of LDPE. It is easy for people to talk about strong paper, which is called "paper-like plastic film".

BOPP biaxially oriented polypropylene

Biaxially oriented polypropylene, also known as biaxially oriented polypropylene, is abbreviated as BOPP, which is characterized by the orientation of stretched molecules, and its mechanical strength, folding strength, air density and moisture-proof barrier are superior to ordinary plastic films. Compared with cellophane per unit area, the unit price is lower than cellophane. Because this film has excellent transparency, the reproduced color after internal printing is particularly bright and beautiful, and it is an important base material of plastic composite soft packaging.

Toxicity identification of plastic bags

Commonly used food plastic bags are mostly polyethylene films, which are non-toxic and can be used to hold food. There is also a membrane made of PVC, which is not toxic in itself, but the additives added according to the purpose of the membrane are often harmful to the human body and have certain toxicity. Therefore, this film and plastic bags made of this film are not suitable for holding food. If you want to identify PVC plastic bags and polyethylene plastic bags, you can use the following simple methods to identify them.

Polyethylene film (nontoxic)

The film is milky white, translucent (especially obvious after being folded several times), smooth to the touch, as if the surface is coated with a layer of wax, which is hard to shake, brittle in sound, flammable in case of fire, yellow in flame, dripping with mucus when burning, and smelling of candles when burning.

PVC film (usually toxic)

If no pigment is added, it is transparent, the surface feels a little sticky, shaking badly and the sound is low. It is not easy to burn in case of fire, and it goes out immediately after leaving the flame, and the flame is green.

History of plastic bags: A photographer's experiment in a darkroom led to the first plastic. Alexander Parks has many hobbies, and photography is one of them. In the19th century, people can't buy ready-made photographic films and chemicals as they do today. They must always make what they need. So every photographer must also be a chemist.

One of the materials used in photography is "collodion", which is a kind of "nitrocellulose" solution, that is, nitrocellulose solution in alcohol and ether. At that time, it was used to stick photosensitive chemicals on glass and make photographic film equivalent to today.

In the 1950s of 19, Parks studied different methods to treat collodion. One day, he tried to mix collodion with camphor. To his surprise, a flexible hard material was produced after mixing. Parks called this substance "Paxsin", which was the earliest plastic.

Parks made all kinds of objects with Paxsin: combs, pens, buttons and jewelry patterns. However, Parks is not very business-conscious. He lost money in his business venture. In the 20th century, people began to explore new uses of plastics. Almost everything in the house can be made of some kind of plastic.

Leave it to other inventors to continue to develop Parks' achievements and profit from them. John wesley Heath, a printer from New York State, saw this opportunity in 1868, when a billiards company complained about the shortage of ivory. Heath improved the manufacturing process and gave Paxsin a new name-celluloid. He got a ready-made market from billiards manufacturers, and soon he made various products out of plastic.

Early plastic caught fire easily, which limited the range of products made from it. The first plastic that can successfully resist high temperature is "Beckett". Leo Baekeland obtained this patent on 1909.

1909, phenolic plastics were synthesized for the first time in Baekeland, USA. In 1930s, nylon came out again, which was called "a kind of fiber composed of coal, air and water, thinner than spider silk, harder than steel and better than silk". Their appearance laid the foundation for the invention and production of various plastics. Due to the development of petrochemical industry in World War II, the raw material of plastics replaced coal with oil, and the plastic manufacturing industry also developed rapidly.

Plastic is a very light substance, which can be softened by heating at a very low temperature and made into various shapes at will. Plastic products are bright in color, light in weight, not afraid of falling, economical and durable. Its appearance not only brings a lot of convenience to people's lives, but also greatly promotes the development of industry.

However, plastics were invented less than 100 years ago. If people were ecstatic about their birth at that time, now they have to deal with these things that are full of life and pose a great threat to the living environment of mankind.

Plastic is a chemical petroleum product extracted from petroleum or coal, and it is difficult to degrade naturally once it is produced. Plastics will not rot and degrade after 200 years underground, and a large amount of plastic garbage will destroy the permeability of soil, harden the soil and affect the growth of plants. If domestic animals eat plastic mixed with feed or left in the wild by mistake, they will also die because of digestive tract obstruction.

At present, the annual output of plastics in China is 300,000 tons and the consumption is more than 6 million tons. The annual output of plastics in the world is 654.38 billion tons. If the annual plastic waste is calculated as 654.38+05%, the annual plastic waste in the world is 6.5438+05 million tons, and the annual plastic waste in China is more than 6.5438+00 million tons, accounting for 40% of the waste. So a lot of waste plastics are buried underground as garbage, which undoubtedly gives the already scarce cultivated land.

Plastics not only bring convenience to people's lives, but also bring irreparable troubles to the environment. People call the disaster that plastics bring to the environment "oil pollution".

At present, many countries use incineration (heat energy recovery) or reprocessing (product recovery) to treat waste plastics. These two methods can recycle waste plastics and save resources. However, because waste plastics will produce gases harmful to human body and pollute the environment when they are burned or reprocessed, it can be said that the treatment of waste plastics is still a headache in environmental protection work.

Edit the plastic bag restrictions in this paragraph.

The General Office of the State Council issued the Notice on Restricting the Production, Sales and Use of Plastic Shopping Bags, requiring all supermarkets, shopping malls, bazaars and other retail places to implement a system of paid use of plastic shopping bags, and plastic shopping bags are not allowed to be provided free of charge.

In addition, passenger trains, passenger ships, buses, planes, stations, airports and tourist attractions are not allowed to provide ultra-thin plastic shopping bags (packaging bags) to passengers and tourists.

Plastic shopping bags must be clearly marked, and enterprises are encouraged to provide bags free of charge.

Plastic shopping bags must be clearly marked and collected separately. According to the notice, retail outlets are not allowed to provide plastic shopping bags free of charge 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 places, and gradually form a market environment for the paid use of plastic shopping bags.

The circular advocates carrying cloth bags, reusing shopping baskets, reusing durable shopping bags and reducing the use of plastic bags. At the same time, enterprises should simplify commodity packaging and choose more green packaging bags. The circular also encourages enterprises and social forces to provide reusable shopping bags such as cloth bags for the masses free of charge.

The production and sale of ultra-thin plastic bags are prohibited throughout the country. From June 1 2008, a tax policy to curb waste plastic pollution will be formulated, and the production, sale and use of plastic shopping bags (ultra-thin plastic shopping bags) with a thickness of less than 0.025mm will also be banned throughout the country.

Starting from June this year 1, all major shopping malls in China will implement the paid use of plastic bags, and customers must pay to stop the proliferation of plastic bags.

Environmental protection plastic bag

The invention of plastic bags has brought great convenience to human life, but more and more people don't know how to use them effectively, which leads to the globalization of plastic bag pollution. We call on everyone to use environmentally friendly plastic bags as much as possible to make their own contribution to our bluer sky.

Advantages compared with traditional plastic bags:

1, water solubility can be designed and selected, completely soluble in water, non-toxic and pollution-free;

2. Strong tensile strength and good tension;

3, high transparency and good luster;

4, high softness and good touch;

5. Good oil resistance, solvent resistance, heat sealing and printability;

6. Low permeability coefficient and good gas barrier;

7. Plastic snap buttons or adhesive bags can be added;

8. Excellent antistatic performance, no vacuuming, etc.

Edit the harm of this plastic bag

Plastic bags do bring convenience to our lives, but this temporary convenience has brought long-term harm.

The recycling value of plastic bags is low. In the process of use, plastic bags are not only scattered in urban streets, tourist areas, water bodies, highways and railways, but also potentially harmful. Plastic has a stable structure, is not easily degraded by natural microorganisms, and does not separate in the natural environment for a long time. This means that if the waste plastic garbage is not recycled, it will become a pollutant in the environment, permanently exist and accumulate, causing great harm to the environment.

First of all, it affects agricultural development. The accumulation of waste plastic products mixed in soil will affect the absorption of nutrients and water by crops, resulting in crop yield reduction.

Second, it poses a threat to the survival of animals. Waste plastic products discarded on land or in water are swallowed by animals as food, resulting in animal death. Last year, there were 20 herders near Qinghai Lake, nearly 1,000 sheep died and the economic loss was more than 300,000 yuan. Sheep like to eat oil residue wrapped in plastic bags, but they often eat together. Because the plastic they eat is difficult to digest in the stomach for a long time, the stomach is crowded, they can't eat any more, and finally they can only starve to death. Such things are common in zoos, pastoral areas, rural areas and oceans.

Thirdly, waste plastics will not only occupy a lot of land with landfill, but also the occupied land will not be restored for a long time, which will affect the sustainable use of land. Waste plastic products entering domestic garbage will not degrade for 200 years if they are buried.

Edit the countries prohibited in this paragraph.

Bangladesh has banned the use of plastic bags.

China has banned free plastic bags.

Ireland is the first country in Europe to raise the price of plastic bags. Since its implementation in 2002, the use of plastic bags has been reduced by 90%.

Rwanda gave up using plastic bags in 2005.

Israel, Canada, western India, Botswana, Kenya, Tanzania, South Africa, China, Taiwan Province Province and Singapore have all banned or will soon ban the use of plastic bags.

On March 27th, 2007, San Francisco became the first city in the United States to ban plastic bags.

American cities Oakland and Boston are also considering whether to ban plastic bags.

Because the raw materials of plastic bags contain some petroleum components, China can save 37 million barrels of oil every year after banning free plastic bags!

Edit the plastic bag type in this paragraph.

(1) high-pressure polyethylene plastic bag

(2) Low pressure polyethylene plastic bags

(3) Polypropylene plastic bags

(4) PVC plastic bags

Edit the purpose of plastic bags in this paragraph.

(1) the use of high-pressure polyethylene plastic bags;

A food packaging: cakes, sweets, roasted seeds and nuts, biscuits, milk powder, salt,

Tea and so on.

B. Packaging of fiber products: shirts, clothing, knitted cotton products and chemical fiber products;

C. packaging of daily chemical products.

(2) The use of low-pressure polyethylene plastic bags:

A, garbage bags and strain bags;

B. Convenient bags, shopping bags, handbags and vest bags;

C. fresh-keeping bags;

D, woven bag inner bag

(3) The use of polypropylene plastic bags:

Mainly used for packaging textiles, knitwear, clothing, shirts and so on.

(4) The use of PVC plastic bags:

A. gift bags;

B, luggage bags, needle cotton packaging bags, cosmetic packaging bags;

C, (zipper) file bag, information bag.