PVDC is an ideal packaging material with high barrier property, strong toughness, and low temperature heat sealing, heat shrinking and chemical stability. It is unique in the packaging industry, especially its resistance to moisture, oxygen, moisture, acid and alkali, oil Dipping and resistance to a variety of chemical solvents and other properties have been widely used in food, medicine, and military packaging for more than 50 years.
PVDC is a copolymer mainly composed of vinylidene chloride. Since pure PVDC is difficult to process, homopolymers have not been industrialized. In the 1930s, the United States DOW Chemical Co., Ltd. developed VDC-VC copolymer and named it "SARAN". In the 1980s, it introduced the VDC-MA series. Therefore, the so-called PVDC industry also refers to the high copolymerization of VDC. Molecular industry.
The development of foreign PVDC industry and the monopoly of PVDC industry are mainly due to the development of its application technology. The original PVDC industry, its products are only used for moisture-proof packaging of military products. In the mid-fifties, it was promoted by the United States DOW Company to civilian use because it solved the blown film technology with a thickness of only 12 microns and its self-adhesiveness. It was accepted by American housewives. As a food preservation film, it is still prevalent today. The development of membrane compounding, coating compounding, enteric coating, and co-extruded film technology has become more widespread in the military, pharmaceutical, and food packaging industries. In particular, with the rapid development of modern packaging technology and the rapid development of modern life, quick-frozen fresh-keeping packaging, cooking utensils for microwave ovens, and extended shelf life of foods and medicines have made the application of PVDC more popular. For decades, its dominant position as a high barrier packaging material has not been shaken. The high-barrier new material EVOH, which appeared in the 1980s, had once experienced the development of PVDC because of its recyclable performance, but due to the drastic decline of EVOH's barrier function under high humidity, it could not be further developed, including biaxially-stretched nylon. Membrane, can not replace a variety of excellent features of PVDC.
The PVDC industry originated from the United States DOW Chemical Co., and was mainly used for military packaging due to its early coincidence with the "World War II." This gave PVDC industrial technology a layer of mystery. Coupled with its high technological content, it became the DOW company for many years. An industrial technology that does not decrypt or transfer. In the 1960s, it cooperated and developed with Japan. At present, PVDC produced by Japan's Wu Yu Company and Xu Yi Company can compete with DOW in the market. United States DOW In view of the production of PVDC latex and the transfer of DOW latex to Hampshire, USA, in recent years, due to the development of latex coating, the product was recovered in 1998.
The status quo of the international PVDC market and development PVDC industry's two major types of products, resins and latexes, had peaked in the mid-1980s, reaching 170,000 tons/year. Later, due to the advent of EVOH and the development of biaxially-stretched nylon membranes,
PVDC products have been reduced to 90,000 tons/year. It is understood that due to the irreplaceable specific energy of PVDC and the development of modern packaging technology and the high requirements for military packaging, it has also risen to 130,000 tons/year in recent years. In the Gulf War in the early 1990s, the U.S. troops fought in the desert and the military food was all PVDC flexible packaging. Because of its lightness and quickness, it also guaranteed the color, aroma, and taste of food. Therefore, after the war, the United States further proposed that the shelf life of military packaging should reach 3 In this year's demanding requirements, only PVDC can guarantee this. In recent years, the PVDC market has not reduced production due to the competition of EVOH and the promotion of white pollution. Instead, it has developed with the development of applications.
According to statistics, the distribution of PVDC markets in the Americas and Europe is basically the same, but the Asia-Pacific region is large but its capacity is not as good as that of the Americas, and Africa is almost a blank. It is believed that with the improvement of people's living standards and the further pursuit of quality of life, PVDC will have great potential for development in Asia and Africa.
From the use point of view, PVDC can be divided into the following categories:
1. Extruded with PVDC resin fresh-keeping from mucous membrane (single film): military products, food composite films, food bags (single film): food, military multi-layer co-extruded film: food, medicine, military products, packaging, beverage casing membrane: food Package, ham sausage, square ham, etc. 2. PVDC resin for solution type coating Special coating, silver-free photosensitive coating, adhesive, container spraying 3. Fiber PVDC resin fishnet wire, flame retardant fabric, artificial turf 4. PVDC latex composite Film, food packaging, military packaging, double-sided coating film, **outer packaging, hard film composite film, pharmaceutical blister packaging, aluminum foil compound, special medicine, equipment packaging, paper coating, food moisture-proof packaging.
PVDC Development Issues and Expectations 1. Technical issues. PVDC is a high-tech new product with high technical content and difficulty. No matter it is a polymerization process or plastic processing, it needs a lot of investment. It is useless to develop modern high-tech products with one-off childish thinking. Domestic blown film machines are just one example. At present, there are still several companies in Shandong. China's plastics processing departments are mostly distributed in the "second light system," limited funds, weak technical forces, and workshop-type handicrafts management. Therefore, the concept of using pellets for injection molding to manufacture soles is obviously a failure. The development of the market economy requires the relevant leaders to pay attention to the establishment of projects in this area. It is necessary to ensure that they stand firm and stand firm and that they have a scientific management mechanism.
2. Environmental issues. In the 1980s, the world's green envoys and environmental protection organizations launched a massive anti-white pollution campaign. In particular, chlorine-containing plastics insurance was sentenced to capital punishment. McDonald's fast food products once changed plastic boxes to cartons, Denmark, the Netherlands, and Sweden. The country announced that it will no longer use PVC, but overall, chlorine-based plastics are still developing, and PVDC is still growing at a rate of 2% in Japan. According to statistics from related departments, PVDC accounts for only 0.5% of the city's plastic waste. The dioxin and Dloxin, the carcinogens produced by combustion, are very limited. It is far less than the toxic substances generated by automobile exhaust emissions and deciduous plant burning. Wuxi Institute of Light Industry Prof. Li Lijun, a long-time PVDC packaging expert, wrote an article that required a comprehensive assessment and a proper assessment of PVDC's environmental pollution. Prof. Li Lijun pointed out that "If we replace paper, wood or other traditional materials today with plastic packaging, we will increase packaging waste by a factor of 4 and volume by 2.5 times. The total energy and total cost of packaging will also increase by a factor of 2. Use plastic bags. The total energy consumption can be reduced by 42%-70%, the air pollution can be reduced by 63%-73%, the water pollution can be reduced by 90%, and the total weight of the material can also be reduced by 75%." Therefore, it can be said that some assumptions are not necessarily scientific. Strictly speaking, PVDC pollution is insignificant.
3. Ideas and regulations. PVDC is unfamiliar to the general consumer, and even some experts, as well as little knowledge of its high barrier properties and the benefits of packaging on the safekeeping of food, coupled with our country's long-standing low standard of living, material supply. Deficiency, so people do not have the basic concept of "shelf life". They don't have high requirements for food preservation. They would rather spend five cents less. They wouldn't spend five pennies to buy PVDC-packed milk. It is normal for food to taste bad. In retrospect, those who love ** spend a few cents more to buy a beautiful package does not matter, therefore, PVDC packaging is very easy to beat people ** packaging, and food packaging manufacturers rarely repeat customers. Of course, with the reform and opening up, the improvement of the quality of life, people's pursuit of food preservation, taste protection, taste protection will go further. However, there must be appropriate laws and regulations to protect it. Foods such as taste-changing and taste-changing foods must be responsible for returns and claims. The shelf life of a certain type of food must be guaranteed by appropriate packaging materials. We are looking forward to the perfection of the food sales regulations and look forward to the stable and orderly development of the PVDC market. At present, the demand for PVDC materials in China is increasing at a rate of 20% every year. Especially in the pharmaceutical packaging industry, the development speed is faster.
PVDC is a copolymer mainly composed of vinylidene chloride. Since pure PVDC is difficult to process, homopolymers have not been industrialized. In the 1930s, the United States DOW Chemical Co., Ltd. developed VDC-VC copolymer and named it "SARAN". In the 1980s, it introduced the VDC-MA series. Therefore, the so-called PVDC industry also refers to the high copolymerization of VDC. Molecular industry.
The development of foreign PVDC industry and the monopoly of PVDC industry are mainly due to the development of its application technology. The original PVDC industry, its products are only used for moisture-proof packaging of military products. In the mid-fifties, it was promoted by the United States DOW Company to civilian use because it solved the blown film technology with a thickness of only 12 microns and its self-adhesiveness. It was accepted by American housewives. As a food preservation film, it is still prevalent today. The development of membrane compounding, coating compounding, enteric coating, and co-extruded film technology has become more widespread in the military, pharmaceutical, and food packaging industries. In particular, with the rapid development of modern packaging technology and the rapid development of modern life, quick-frozen fresh-keeping packaging, cooking utensils for microwave ovens, and extended shelf life of foods and medicines have made the application of PVDC more popular. For decades, its dominant position as a high barrier packaging material has not been shaken. The high-barrier new material EVOH, which appeared in the 1980s, had once experienced the development of PVDC because of its recyclable performance, but due to the drastic decline of EVOH's barrier function under high humidity, it could not be further developed, including biaxially-stretched nylon. Membrane, can not replace a variety of excellent features of PVDC.
The PVDC industry originated from the United States DOW Chemical Co., and was mainly used for military packaging due to its early coincidence with the "World War II." This gave PVDC industrial technology a layer of mystery. Coupled with its high technological content, it became the DOW company for many years. An industrial technology that does not decrypt or transfer. In the 1960s, it cooperated and developed with Japan. At present, PVDC produced by Japan's Wu Yu Company and Xu Yi Company can compete with DOW in the market. United States DOW In view of the production of PVDC latex and the transfer of DOW latex to Hampshire, USA, in recent years, due to the development of latex coating, the product was recovered in 1998.
The status quo of the international PVDC market and development PVDC industry's two major types of products, resins and latexes, had peaked in the mid-1980s, reaching 170,000 tons/year. Later, due to the advent of EVOH and the development of biaxially-stretched nylon membranes,
PVDC products have been reduced to 90,000 tons/year. It is understood that due to the irreplaceable specific energy of PVDC and the development of modern packaging technology and the high requirements for military packaging, it has also risen to 130,000 tons/year in recent years. In the Gulf War in the early 1990s, the U.S. troops fought in the desert and the military food was all PVDC flexible packaging. Because of its lightness and quickness, it also guaranteed the color, aroma, and taste of food. Therefore, after the war, the United States further proposed that the shelf life of military packaging should reach 3 In this year's demanding requirements, only PVDC can guarantee this. In recent years, the PVDC market has not reduced production due to the competition of EVOH and the promotion of white pollution. Instead, it has developed with the development of applications.
According to statistics, the distribution of PVDC markets in the Americas and Europe is basically the same, but the Asia-Pacific region is large but its capacity is not as good as that of the Americas, and Africa is almost a blank. It is believed that with the improvement of people's living standards and the further pursuit of quality of life, PVDC will have great potential for development in Asia and Africa.
From the use point of view, PVDC can be divided into the following categories:
1. Extruded with PVDC resin fresh-keeping from mucous membrane (single film): military products, food composite films, food bags (single film): food, military multi-layer co-extruded film: food, medicine, military products, packaging, beverage casing membrane: food Package, ham sausage, square ham, etc. 2. PVDC resin for solution type coating Special coating, silver-free photosensitive coating, adhesive, container spraying 3. Fiber PVDC resin fishnet wire, flame retardant fabric, artificial turf 4. PVDC latex composite Film, food packaging, military packaging, double-sided coating film, **outer packaging, hard film composite film, pharmaceutical blister packaging, aluminum foil compound, special medicine, equipment packaging, paper coating, food moisture-proof packaging.
PVDC Development Issues and Expectations 1. Technical issues. PVDC is a high-tech new product with high technical content and difficulty. No matter it is a polymerization process or plastic processing, it needs a lot of investment. It is useless to develop modern high-tech products with one-off childish thinking. Domestic blown film machines are just one example. At present, there are still several companies in Shandong. China's plastics processing departments are mostly distributed in the "second light system," limited funds, weak technical forces, and workshop-type handicrafts management. Therefore, the concept of using pellets for injection molding to manufacture soles is obviously a failure. The development of the market economy requires the relevant leaders to pay attention to the establishment of projects in this area. It is necessary to ensure that they stand firm and stand firm and that they have a scientific management mechanism.
2. Environmental issues. In the 1980s, the world's green envoys and environmental protection organizations launched a massive anti-white pollution campaign. In particular, chlorine-containing plastics insurance was sentenced to capital punishment. McDonald's fast food products once changed plastic boxes to cartons, Denmark, the Netherlands, and Sweden. The country announced that it will no longer use PVC, but overall, chlorine-based plastics are still developing, and PVDC is still growing at a rate of 2% in Japan. According to statistics from related departments, PVDC accounts for only 0.5% of the city's plastic waste. The dioxin and Dloxin, the carcinogens produced by combustion, are very limited. It is far less than the toxic substances generated by automobile exhaust emissions and deciduous plant burning. Wuxi Institute of Light Industry Prof. Li Lijun, a long-time PVDC packaging expert, wrote an article that required a comprehensive assessment and a proper assessment of PVDC's environmental pollution. Prof. Li Lijun pointed out that "If we replace paper, wood or other traditional materials today with plastic packaging, we will increase packaging waste by a factor of 4 and volume by 2.5 times. The total energy and total cost of packaging will also increase by a factor of 2. Use plastic bags. The total energy consumption can be reduced by 42%-70%, the air pollution can be reduced by 63%-73%, the water pollution can be reduced by 90%, and the total weight of the material can also be reduced by 75%." Therefore, it can be said that some assumptions are not necessarily scientific. Strictly speaking, PVDC pollution is insignificant.
3. Ideas and regulations. PVDC is unfamiliar to the general consumer, and even some experts, as well as little knowledge of its high barrier properties and the benefits of packaging on the safekeeping of food, coupled with our country's long-standing low standard of living, material supply. Deficiency, so people do not have the basic concept of "shelf life". They don't have high requirements for food preservation. They would rather spend five cents less. They wouldn't spend five pennies to buy PVDC-packed milk. It is normal for food to taste bad. In retrospect, those who love ** spend a few cents more to buy a beautiful package does not matter, therefore, PVDC packaging is very easy to beat people ** packaging, and food packaging manufacturers rarely repeat customers. Of course, with the reform and opening up, the improvement of the quality of life, people's pursuit of food preservation, taste protection, taste protection will go further. However, there must be appropriate laws and regulations to protect it. Foods such as taste-changing and taste-changing foods must be responsible for returns and claims. The shelf life of a certain type of food must be guaranteed by appropriate packaging materials. We are looking forward to the perfection of the food sales regulations and look forward to the stable and orderly development of the PVDC market. At present, the demand for PVDC materials in China is increasing at a rate of 20% every year. Especially in the pharmaceutical packaging industry, the development speed is faster.
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