In our daily lives, people like to use plastic bags filled with rice cakes, rice flowers ...... But it must be understood that there are two kinds of plastic bags used in the market; some are made of PVC, polystyrene, diamine plastic, this chemical raw material to make film, often to add additives. Additives are containing a variety of harmful substances, so this bag can not be loaded with food; used as a food bag when the plastic film of its chemical raw material is polyethylene, polypropylene, non-toxic.
How to identify toxic or non-toxic plastic bags?
One, put the plastic bag under water, due to different specific gravity, polyethylene, polypropylene floating in the water is non-toxic, polyvinyl chloride, polystyrene is toxic to sink to the bottom of the water;
Two, from the appearance of polyethylene, polypropylene is relatively soft, basically transparent, but polyethylene milky white, polypropylene white; and polyvinyl chloride made of plastic bags with a slight yellow color, softness is poorer than polyethylene, polypropylene, and Slightly plasticizer flavor;
Three, non-toxic raw materials polypropylene, polyethylene, hand feel a sense of lubrication, the surface of the wax like attached, easily flammable in the event of a fire, like wax candle oil such as with the same droplets, the flame is yellow, paraffin odor, this can be loaded with food; such as the use of toxic raw materials, polyvinyl chloride, polystyrene, diamine plastic plastic plastic bags made of plastic bags hand-triggered sticky, not easy to burn, away from the fire that is, the flame is green, with a choking odor!
Nowadays, plastic bags can be used to contain rice, food, etc.
Now, the plastic bag instead of the previous vegetable blue, it is a very wide range of applications, especially for food packaging plastic bags, more to attract our attention. Plastic bags are generally made of two types of plastic film: one type is made of polyethylene, polypropylene and dense ammonia and other raw materials; the other type of use made of polyvinyl chloride. The former is non-toxic; the latter is toxic and can not package food.
Plastic bags with or without toxicity can be identified in the following simple way:?
Water testing method Put the plastic bag into the water, non-toxic plastic bags into the water, can float out of the water; and toxic plastic bags are not floating upwards.
Hand Touch Detection Method Touch the plastic bag with your hand, there is a sense of lubrication of the non-toxic; otherwise, it is toxic.
Shake detection method Use your hand to grab one end of the plastic bag, and mix it with force to make a crisp sound of non-toxic; otherwise, it is toxic.
Fire detection method can be cut off a plastic bag edge, with the fire, toxic is not easy to burn; non-toxic easily burned by fire.
Water-soluble non-toxic plastic film
Water-soluble fully degradable non-toxic plastic film and production technology, is to completely eliminate "white pollution" of high-tech. It uses polymer materials, carbohydrates, improvers, etc., after special technology and methods, made of water-soluble controllable fully degradable plastics, has now won the national invention patent, its patent number is ZL9610568.78, and by the national leadership at all levels of great importance. The plastic film produced by this patented technology and special equipment, in addition to the characteristics of ordinary plastics and starch plastics, the most important feature is that it can be used to achieve the purpose of controlled total degradation through different ways, ordinary plastics can not be degraded, starch plastics can be degraded only by the starch part of the plastic; firstly, it is recycled after use, and can be used to make film again after clean treatment, which can reduce the cost by nearly half; secondly, it can be used in the soil in a certain period of time according to the requirements of total degradation; thirdly, it can be used in the soil in a certain period of time according to the requirements of total degradation. Secondly, it can be degraded in the soil within a certain period of time according to the requirements of use; thirdly, it can be dissolved quickly in cold and hot water respectively after use. With these three ways, after the use of water-soluble plastic film can be said to be nowhere to escape, we call it "water burial white pollution". In addition, according to the national "vigorously develop green environmental protection industry", "eliminate white pollution" to support the development of green environmental protection industry slogan can also be seen, this technology is in line with the national industrial development policy. Ordinary plastic products are replaced by degradable products has become an inevitable development trend. Degradable, non-polluting, non-toxic new environmentally friendly "plastic", will bring you millions of dollars in profits!
How to distinguish between toxic and non-toxic plastic bags How to identify toxic or non-toxic plastic bags? First, the plastic bag under water, due to different specific gravity, polyethylene, polypropylene floating in the water is non-toxic, polyvinyl chloride, polystyrene is toxic to sink to the bottom of the water; Second, from the appearance of polyethylene, polypropylene is relatively soft, basically transparent, but the polyethylene milky white, polypropylene white; and polyvinyl chloride plastic bags with a slight yellow color, softness is worse than the polyethylene, polypropylene, and a slight flavor of the plasticizer; Third, the non-toxic raw materials Polypropylene, polyethylene, hand feel a sense of lubrication, the surface of the wax like attached, flammable in case of fire, like wax candle oil such as with the same drops, flame yellow, paraffin odor, this can be loaded with food; such as toxic raw materials with polyvinyl chloride, polystyrene, diamine plastic plastic plastic bags made of plastic bags hand-triggered viscous, not easy to burn, away from the fire that is, the flame is green, with a choking odor, can not be used to load rice, food, and so on.
Non-toxic plastic bag quality standards
Non-toxic plastic bag quality standards
Scope of application of this standard applies to the intermediate packaging in the factory with non-toxic plastic bag inspection.
Materials High-pressure polyethylene.
Specifications and dimensions of non-toxic plastic bags with a precision of 1mm tape measure to determine the length and width.
Length should be 900±20mm, width should be 700±20mm, thickness should be 0.08±0.01mm.
Technical Standards Appearance The surface should be clean, transparent, no scratches, pinholes, no moldy spots, uneven or crooked torn.
Sealability The plastic bag will be filled with a certain amount of air, hand-tighten the mouth of the plastic bag, squeeze hard in the middle of the plastic bag, there should be no air leakage rupture.
Microbial limit The total number of bacteria should be ≤1000/100cm2, the total number of molds should be ≤100/100cm2, E. coli and live mites should not be detected.
No. B-024
Re-testing cycle 12 months for the first re-testing cycle and 12 months for the second re-testing cycle.
Toxic plastic bag components and environmental hazards
The main hazards:
"White pollution" mainly refers to the environment caused by "visual pollution" and "potential hazards "
The two negative
effects on the environment.
"Visual pollution" refers to the scattered in the city, people discarded plastic waste on the cityscape, landscape
destruction. For example, scattered on both sides of the railway, rivers and lakes in a large number of polystyrene foam plastic tableware and flying or hanging in the sky on the branches of the ultra-thin plastic bags, which bring people bad visual stimulation, the people reflect this strongly.
"Potential crisis" refers to the plastic waste into the natural environment and difficult to degrade the environmental problems brought about by the
The hazards mainly include the following:
Not easy to recycle because of recycling in the utilization of the high cost, but the utilization rate is low, the businessman can be said to be unprofitable, but also because of it! Recycling price is very low it is difficult to attract the general public to carry out "white recycling" work. Therefore, the phenomenon of not easy to recycle occurs.
Difficult to degrade. Recycling back to the white waste is not easy to deal with. At this stage, the main treatment methods are incineration and landfill, if it is incinerated, it will produce a large number of toxic fumes, pollution of the atmosphere, and promote the formation of acid rain, and as for the landfill, it will be buried for 100 years, it is still the original state, can not be absorbed by the nature and the land has a great harm to change its pH, affecting the crops to absorb nutrients and water, leading to agricultural production, as for the abandonment of the plastic products in the water or land, not only affecting the environment, but also to the land, the land, the land, the land, the land, the land, the land, the land, the land, the water, the water, the land, the land, the land. As for the plastic products discarded in the water or on the land, they not only affect the environment, but also lead to death if they are swallowed by the animals. This destroys the ecological balance.
High temperature decomposition of toxic substances, plastic products are non-toxic substances, but because of its recycling equipment is not perfect, poor technology, and many manufacturers do not have a legal business license, resulting in the reproduction of plastic products at a temperature of 65 ° C, the toxic substances will be precipitated and seeped into the food, then the liver, kidneys, reproductive system and central nervous system, and other important parts of the human body will be harmed. The following is a list of the most important substances that can be used in food products.
Answer: black and white_milk_tea - Lifter 5 11-11 18:02
Potential crisis" refers to the environmental problems brought about by the difficult degradation of plastic waste into the natural environment,
The hazards include the following:
Not easy to recycle because recycling in the use of the cost is high, but the utilization rate is low, the business can be said to be unprofitable, and the public can be said to have no access to the information. Business can be said to be unprofitable, and because of its low recycling price is very difficult to attract the general public to carry out "white recycling" work. Therefore, the phenomenon of not easy to recycle occurs.
Difficult to degrade. Recycling back to the white waste is not easy to deal with. At this stage, the main treatment methods are incineration and landfill, if it is incinerated, it will produce a large number of toxic fumes, pollution of the atmosphere, and promote the formation of acid rain, and as for the landfill, it will be buried for 100 years, it is still the original state, can not be absorbed by the nature and the land has a great harm to change its pH, affecting the crops to absorb nutrients and water, leading to agricultural production, as for the abandonment of the plastic products in the water or land, not only affecting the environment, but also to the land, the land, the land, the land, the land, the land, the land, the land, the land, the water, the water, the land, the land, the land. As for the plastic products discarded in the water or on the land, they not only affect the environment, but also lead to death if they are swallowed by the animals. This destroys the ecological balance.
High temperature decomposition of toxic substances, plastic products are non-toxic substances, but because of its recycling equipment is not perfect, poor technology, and many manufacturers do not have a legal business license, resulting in the reproduction of plastic products at a temperature of 65 ° C, the toxic substances will be precipitated and seeped into the food, then the liver, kidneys, reproductive system and central nervous system, and other important parts of the human body will be harmed. The result is harmful to the liver, kidneys, reproductive system and central nervous system and other important parts of the human body.
Experts have found that almost all plastic products contain large amounts of plasticizers, which are potentially harmful to the human body.
Last year, once triggered the supermarket cling film safety crisis "plasticizer" (plastic bags and plastic products contain a "phthalate esters" chemical composition, adding this chemical composition can increase the plasticity and flexibility of the plastic to improve the strength of plastic products), is now again Plastic products), now once again into people's lives. And this time the problem is in the people's three meals a day use of cooking oil plastic drums.
Not long ago, the Guangzhou Food Safety Information Network released news that a study by Tongji University confirmed that plasticizers in plastic buckets for cooking oil are harmful to humans. "Cooking oil in plastic buckets, cooking oil will dissolve into plasticizers that are harmful to humans." According to the news, the group of Prof. Shuguang Li of Tongji University's School of Basic Medical Sciences had collected plastic drums of soybean salad oil, blended oil and peanut oil of different brands and different factory dates on the market, as well as bulk soybean oil sold on the market. After measurement, it was found that almost all brands of cooking oil in plastic drums contained the plasticizer "dibutyl phthalate". It was deduced that the plasticizers detected in cooking oil were mainly from plastic containers. This plasticizer has a toxic effect on the human reproductive system, and is more toxic to men.
In the past, it has been considered that plasticizer-like compounds have low toxicity, good physical and chemical characteristics, and easy to produce and inexpensive, so almost unrestricted production and use. At present, China has become a big country to use plasticizers, the annual production of more than 300,000 tons of plasticizers.
A comparative study conducted by Prof. Knight showed that the plasticizers detected in cooking oils mainly came from their plastic containers. Among the cooking oil samples collected by the research team, one brand of cooking oil samples in plastic drums was found to have the highest levels of plasticizers, at 2.98mg/L and 24.16mg/L respectively, which the researchers believe may be due to the high plasticizer content in the brand's plastic containers or contamination by plasticizers during production and processing.
The study also found that there was no significant correlation between the amount of phthalate plasticizers in the samples and the storage time. The migration rate of plasticizers into edible oils is influenced by many factors. In addition to the storage time, the migration rate is related to the storage temperature and the plastic packaging material? The content of plasticizer is related: the higher the storage temperature, the faster the migration rate; the higher the content of plasticizer in the plastic, the poorer the compatibility of the plasticizer used with the resin, and the larger the percentage of plasticizer that may be dissolved. The plasticizer content in the plastic packaging materials used for cooking oil in barrels from different manufacturers is different, and the storage temperature also varies with the environment. Therefore, without controlling other influencing factors, the plasticizer content in cooking oil does not show a clear trend of increasing with the extension of storage time. The very high levels of plasticizers in cooking oil residues accumulated on exhaust hoods in home kitchens suggest that a large amount of plasticizers may also be inhaled into the lungs along with the fumes during the cooking process.
The news also said that researchers found that the acute toxicity of plasticizers is very low, the human body ingested a short period of time almost no acute toxicity, but this does not mean that it is safe, on the contrary, its chronic toxicity on the human body is quite harmful. Foreign animal research results show that plasticizers can lead to reduced survival rate of animals, weight loss, decreased liver and kidney function, blood erythrocyte reduction, mutagenicity and carcinogenicity.
Experts, containing DOP (dioctyl phthalate) plasticizer PVC products in the field of human health care, life-related applications are also very wide, and it is difficult to use other materials to replace all. Such as latex gloves, plasma bags, part of the blood transfusion, infusion, respiratory appliances, as well as children's toys, artificial leather (used as clothing, footwear, handbags, sofa fabrics, etc.), PVC products account for a large proportion. Some developed countries have used plasticizers and other additives in these products have strict regulations or corresponding recommendations, while China's medical gloves, plasma bags, the main plasticizer is still DOP.
More worrying is that the current plasticizer pollution is almost ubiquitous, the chemical industry's most commonly used raw materials, with the passage of time will slowly overflow from the plastic products into the air, soil, water and even food. , water and even food. "The wide range of its use, the size of the contaminated area, the number of people affected, more than pesticides, DDT, etc. ever." Professor Li Shuguang pointed out that few people realize this yet. This is a very dangerous trend, if the national authorities do not give effective prevention and strong control, we will bear serious consequences for this phenomenon .
With the development and use of plasticizers, people are paying more attention to their safety. Governments have begun to realize the potential threat of plasticizers to human health, such as Denmark banned the use of phthalate plasticizers in the plastics of toys and nursery supplies for young children. Because most young children like to put toys into their mouths, so plasticizers will endanger children's health; Switzerland also banned the use of DOP in children's toys.
While the way to limit plasticizers varies from country to country, but basically follow two principles: first, limit the use of plasticizers in plastics; second, limit the maximum allowable amount of migration to food. The countries adopting the first principle are the United States, Germany, Britain, Japan and so on, and the Netherlands, Italy, Spain and other countries will use the above two principles in combination.
It is reported that China has also formulated health standards for the use of food containers, packaging materials with additives (GB9685-94), food containers, packaging materials with the use of additives of the varieties, the use of the scope and the maximum amount of use are stipulated, of which the maximum permissible amount of use of DBP (dibutyl phthalate) and DOP are 35% and 50%, respectively. The maximum permissible levels for DBP (dibutyl phthalate) and DOP are 35% and 50%, respectively, but the maximum permissible levels for food have not yet been established.
To this end, some experts suggest that China's food industry should vigorously promote the reduction of the use of plastic packaging containers, in particular, should be avoided with a variety of plastic products in direct contact with the food, to prevent the plasticizer on the contamination of food. At the same time, should increase investment in scientific research to carry out research on the toxicity of plasticizers, as well as human health with the relevant prospective epidemiological investigations, from the cellular, molecular, genetic and other levels of analysis and understanding of the toxicity of plasticizers in the field of polymers to develop and develop a better quality and safer alternative products, and research related to the intervention of preventive and curative measures.