Future analysis of the hottest green packaging pri

Future analysis of green packaging printing (Part 2)

(I) pollution in printing

1. Harm of printing ink to human body

the main pollutant in printing ink is "organic volatile compounds", which is abbreviated as VOC (volatile organic compounds), and it is some organic chemicals that can react with nitrogen oxide dust in sunlight and ozone layer. VOC volatilized into ozone, combined with fine dust particles in dust and other substances, will form fog, stimulate human lungs, and have a negative impact on the health of animals, plants and other organisms

at present, solvent based inks are mainly used in China's printing industry, in which VOC (organic volatile matter) emissions are large. Some inorganic pigments contain heavy metal elements such as lead, chromium, copper, mercury and so on, which are toxic and cannot be used for printing food packaging and children's toys; Some organic pigments contain biphenyl gum, which is carcinogenic. Many organic solvents used in printing are natural resins and synthetic resins, which are important components of various inks. In production, the solvent enters the body through skin contact, which will damage the human body and subcutaneous fat, and long-term contact will make the skin dry and rough; If it penetrates into the skin or blood vessels, it will endanger human blood cells and hematopoietic function with the blood; Being sucked into the trachea, bronchus, lungs or transmitted to other parts through blood vessels and lymphatic vessels may even cause chronic poisoning. Some inks have the toxicity of heavy metal ions. Pigments and fuels contain carcinogenic ingredients, which are very harmful to human body

composite packaging materials use a lot of ink in printing, and some toxic substances will migrate to food and endanger people's health. Ethanol, isopropanol, butanol, propanol, butanone, ethyl acetate, butyl acetate, toluene, xylene and other organic solvents are often used in printing inks, which are toxic and flammable, and are not conducive to environmental protection, health and safety. Although most of them can be removed by drying, the residual solvent will migrate to food and endanger human health. Especially in gravure printing inks, the pigment particles are very small and the adsorption force is very strong. Although they have been heated and dried during printing, due to short time and fast speed, they are often not completely dried, especially for printing materials with large inking area and thick ink layer, there are more residual solvents. These residual solvents are brought into the compounding process, which is more difficult to run away after compounding, and will slowly migrate and penetrate, which will directly endanger human health. In Europe, the situation of gravure printing materials is very different. For example, almost 100% of gravure publication printing and decorative printing use water-based inks. Basically, water-based or alcohol inks are used in packaging gravure printing, and mixed solvents are not used at all, which is convenient for recycling. The proportion of solvent-free composite reached nearly 90%. Therefore, the environmental protection problem of gravure printing process has been nearly completely solved. Therefore, China's improvement work in this area should be accelerated

2. Water pollution

water pollution produced in gravure printing mainly comes from inorganic substances such as corrosive solution and electroplating waste liquid of heavy metals used in the process of plate making, and organic substances contained in photographic film and offset printing plate development and washing waste liquid. Most of them are directly discharged into rivers, lakes and seas without effective treatment, which is one of the important reasons for water pollution. At the same time, they will also pollute the soil and enrich in the soil

3. Noise pollution

the noise generated by printing machines, air compressors, drying equipment and various molding machines, to a certain extent, causes damage to human functions

(II) basic countermeasures for developing green printing

first, vigorously develop new inks that meet environmental requirements, such as water-based inks and UV inks. Water based ink is recognized as an environmentally friendly printing material in the world. Because water is a polar substance, according to the solubility of polar substances and polar substances, water-based ink does not contain or contains a very small amount of organic solvents. Therefore, the biggest feature of water-based ink is to reduce the emission of VOC

so as to avoid the pollution of volatile organic compounds and improve the printing environment, It is beneficial to human health. PHB can reach the effect of zero level release when it is used as a drug transport carrier. It can completely eliminate the harm of some toxic and harmful substances in solvent ink to human body and the pollution of packaging products. It is especially suitable for packaging and printing products with strict sanitary conditions, such as food, beverage, medicine and so on. In addition, it can also reduce the fire hazards caused by static electricity and flammable solvents, and reduce the residual solvent odor on the surface of printed matter

second, develop water-based glazing technology. Film coating and oily glazing will cause great harm to the environment, while the diluent used in water-based glazing is non-toxic, tasteless and pollution-free water. From the perspective of environmental protection and human health, water-based glazing technology undoubtedly has advantages

third, use environmental protection technology to treat waste gas and waste. All kinds of wastes generated in the printing process are collected specially, and valuable articles such as paper are recycled. Materials that are difficult to degrade and harm the environment, such as film and plastic film, are recycled by the garbage recycling station for resource treatment or sanitary landfill

at this stage, due to process and other reasons, we have to use all kinds of polluting printing materials, such as oily ink, oily film coating, oily glazing, etc. the harmful and toxic gases generated in the process of use can be treated by means of suction, absorption, catalytic combustion and other methods, so as to reduce the concentration of harmful gases in the working environment and reduce the harm to human body, At the same time, it also reduces the pollution of harmful gases to the environment, which refers to the situation that the experimental piece is installed on the experimental machine without being removed during the experimental process, so that the 10 prefix temporarily stops moving

III. circular economy and sustainable development of packaging and printing industry

with the rapid economic growth and continuous increase of population in China, the contradiction of insufficient resources such as water, land, energy and minerals is becoming more and more prominent, and the situation of ecological construction and environmental protection is becoming increasingly severe. Facing this situation, it is particularly important and urgent to vigorously develop the circular economy and speed up the construction of a resource-saving society in accordance with the requirements of the scientific concept of development. Developing circular economy is the fundamental way to alleviate the contradiction of resource constraints, an effective way to fundamentally reduce environmental pollution, an important measure to improve economic efficiency, an urgent need to deal with new trade protectionism, and an essential requirement for people-oriented and sustainable development. The so-called circular economy is an economy that integrates cleaner production and the comprehensive utilization of waste. In essence, it is an ecological economy, which requires the use of ecological laws to guide the economic activities of human society. Compared with the traditional economy, the difference of circular economy is that the traditional economy is an economy with one-way material flow composed of "resources - products - pollution emissions". In this economy, people develop the materials and energy on the earth with higher and higher intensity, and discharge a large amount of pollution and waste into the environment in the process of production, processing and consumption. The use of resources is often extensive and one-time. The clamping of samples is often extensive and one-time. The quantitative growth of the economy is achieved by continuously turning resources into waste, resulting in the shortage and depletion of many natural resources, And caused disastrous environmental pollution consequences. In contrast, circular economy advocates an economic development model based on the continuous recycling of materials. It requires that economic activities be organized into a process of repeated circulation and flow of materials of "resources - products - renewable resources" according to the model of natural ecosystem, so that the whole economic system and the process of production and consumption basically do not produce or only produce a small amount of waste

as the saying goes, there are only resources misplaced, but no real waste. Circular economy is characterized by low input (reduce), reuse (reuse) of natural resources and recycling of waste; Rccycle, that is to follow the 3R principle, so as to fundamentally eliminate the sharp conflict between environment and development for a long time. In short, circular economy is to use natural resources and environmental capacity according to ecological laws to realize the ecological transformation of economic activities. It is an inevitable choice and important guarantee for the implementation of sustainable strategy. For a long time, China's packaging and printing industry has developed extensively under the conditions of high consumption, high energy consumption and high pollution. However, with the fragility of the ecosystem in which human beings live, the deterioration of environmental quality and the high lack of resources, we can no longer follow the traditional development model in terms of resource stock and environmental carrying capacity. If the packaging and printing industry continues to follow the road of traditional economic development, it can only slow down the process of China's modernization and hinder the healthy and sustainable development of the packaging and printing industry. Developing closed-loop control is a control method that takes a certain measurement as the feedback signal and adjusts the control output in real time according to the size of the feedback signal and its PID parameters. Economic and environmental protection are inevitable prominent contradictions in the traditional economy. To fundamentally solve this deep contradiction, we must realize the transformation from traditional economy to circular economy in the development mode as soon as possible and realize sustainable consumption in the consumption mode. Based on the rapid development of packaging and printing industry, we should pay attention to the overall planning of industry structure, efficiency and quality. Vigorously developing green packaging and printing is the concrete manifestation of circular economy in the packaging and printing industry, the essential requirement of developing circular economy and the concept of comprehensive, coordinated and sustainable development, and a powerful measure to establish a resource-saving society and promote the harmony between man and nature. All colleagues in the packaging and printing industry should understand from a strategic height, grasp the importance and urgency of developing circular economy with an overall perspective, and further enhance their consciousness and sense of responsibility. It is imperative to vigorously develop green packaging and printing