Current situation and development trend of the mos

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Current situation and development trend of green packaging industry at home and abroad (IV)

2. Plastic packaging

(1) research and development of biodegradable foamed plastics, Manufacture new starch based foams and degradable plastic products based on degradable resin masterbatch. If lactic acid and hydroxyl are used as the base materials, the "full degradation" (no residue) biodegradable plastics can be realized beyond the common starch base type

from the technical and economic analysis, among all degradation technologies, biodegradation is the first choice. Among the EPS fast food boxes that replace polystyrene foamed plastic, biodegradable PS foamed plastic tableware is the best choice. If we can establish a large-scale resin product enterprise to produce degradable masterbatch, and further deepen the two processing capabilities, we can produce foam liners, vest shopping bags and agricultural film with great market demand, Will be able to obtain huge economic and social benefits

(2) development and application of biaxially oriented polystyrene sheet (BOPS)

bops is a kind of green packaging material that is easy to recycle, does not contain toxic substances, and can replace PVC film. It is mainly used in food and pharmaceutical packaging. Compared with PVC, BOPS has ten advantages:

a. good strength, stiffness and tear resistance make the product better protected

b. good transparency

c. non toxic, tasteless, in line with international food, medical and health standards

d. good chemical stability, no reaction with acid, alkali salt, etc

e. good temperature adaptability. The product size can be stable within the range of -35 "C to + 90`c

f. good surface printability

g. it does not contain trace toxic monomers. In the process of accelerating the upgrading of plastic granulator technology and even incineration, it does not emit toxic substances and can be 100% recycled

h. the transmittance of cement is less than that of PVC

i. the specific gravity is 30% less than that of PVC, that is, BOPS sheet with the same weight and thickness can have 30% more packaging area than PVC sheet

j. good processability and wide application range

because BOPS packaging products have the above excellent properties, they have been widely used in the United States, Japan and European developed countries. At present, they are gradually accepted in China. The gradual replacement of PVC by BOPS is the development trend and result

food and pharmaceutical packaging has a large demand for BOPS, which is easy to recycle and has good environmental protection benefits

(3) recycled PET resin is used for food and packaging technology development

the application of polyester resin in packaging is the fastest growing field among the three major fields of polyester resin (fiber, pattern sheet and various containers) since the 1980s, and will continue to grow. At present, the research on the recycling of pet has achieved successful experience in multiphase, but there is no successful example of the method of regenerating pet as food packaging raw material in China

pet resin recycling and regeneration for food packaging PET resin is a promising research direction with the best economic and benefit. Relevant departments are stepping up research

(4) production technology of water-soluble packaging film. However, at present, water-soluble PVA is mainly heat treated to increase its crystallinity and produce partial cross-linking, or treated with organic substances such as aldehyde to form polyvinyl acetal cross-linking on the surface, so as to improve its water resistance and prepare water-insoluble films. This kind of film has very good barrier property and is widely used in food packaging

if the PVA resin is directly made into a water-soluble film without the above treatment, for example, the PVA solution is directly added with 10-20% plasticizer such as ethylene glycol or glycerol, poured onto the heated drum or steel strip by casting casting method, and the water evaporated black is heat treated at 120 ℃ and formed into a film. This packaging film is more in line with the requirements of "green" in terms of raw material production, packaging process and waste treatment

the water-soluble PVA bag can be used for the packaging of a single dose of water-soluble pesticides. It can dissolve the pesticides in the water together with the packaging bag, eliminating the harmful operation of contacting pesticides such as weighing. It can also be used for the packaging of hospital bacteria carrying clothes. The operators do not need to contact bacteria contaminated clothes during washing, but directly put them into the washing core. In addition, it can also be used for the packaging of a single dose of detergent

(5) waste 7. The compression curve, force value and automatically converted MPa value of each test block will be reflected in the table. See the previous details for polyester (PET) packaging recycling (chemical method)

(6) for the development and application of waste plastic oiling technology, see the previous details

(7) the development and application of the technology for producing high-strength flame retardant composite wood plastics from waste plastics are described in detail above

(8) recycling technology of polystyrene foaming materials

the recycling of polystyrene foamed materials is based on the reverse reduction principle of polystyrene synthesis and foaming process. By using the recycling mechanism, the foaming residues and additives in the polystyrene foamed materials are completely volatilized to form transparent polystyrene particles through crushing, melting and shrinking, mixing, extrusion and granulation

recycled transparent polystyrene has a wide range of uses. In the manufacturing of injection molding, extrusion and calendering products, it can replace the products with less strict production requirements or coloring with new materials, such as color plates, color bars, buttons and other household appliances and office supplies

polystyrene foaming material recycling machine. Recycling recycled polystyrene foaming materials has significant economic and social benefits, and has been highly valued by the society. It will play a greater role in eliminating white pollution and beautifying the environment

(9) research on composting and soilless cutting substrate of degradable polystyrene (PS) expanded lunch boxes the excellent comprehensive performance and convenience of life of polystyrene (PS) expanded lunch boxes have been well known, but they are not easy to be degraded by the environment after application, and the pollution to the landscape and environment has brought great trouble to people. This technology is a supporting technology for the environmental harmlessness of degradable plastic lunch boxes, and the recycling of waste fast food boxes with large consumption. Through crushing and harmlessness treatment, they are mixed with soil and other substrates to carry out Soilless and semi soil cultivation. It is of great significance to treat the environmental pollution caused by PS lunch boxes and return to nature

a. development of PS foaming lunch box waste crushing equipment

b. compost fragmentation (25mm) harmless pretreatment

c. study on Soilless or semi soil substrate culture

(10) using waste plastics to produce coated fertilizer

using waste packaging plastics (including PE, PP, PVC and PS) and filling blends (including a variety of urban and rural wastes such as activated carbon residues, crushed animal and plant wastes, weathered coal, humic acid and other powders) to form a fertilizer coating, which is coated on the surface of fertilizer particles to form a special structure. The whole process of fertilizer liberation, crushing and degradation will not hinder farming. On the contrary, it will also increase the air permeability and water permeability of the soil

the "2002 International Forum on sustainable development and environmentally degradable plastics industry development" was jointly held by the UNIDO International Research Center for science and high technology (icsunido), the degradable plastics special committee of China Plastics Association and Tsinghua University. It was recently held at Tsinghua unisplenum International Exchange Center. Through discussion and exchange, the forum reached the following consensus:

the rapid development of EDP research, production and application in China has shocked UN officials, foreign experts and peers. At present, China's EDP research, production and application are at an advanced international level

edp research and development is of great significance not only in protecting the earth's environment, reducing pollution, link contradictions and developing medical biopolymer materials for the benefit of mankind, but also in saving resources and supplementing and replacing the limited and decreasing non renewable oil resources. Therefore, it is in line with the development direction of sustainable development that the world pays attention to

at present, there is no internationally recognized definition and classification of EDP in the world, so the understanding is quite confused, which has also caused some misunderstanding. In particular, the starch additive degradable plastics) degradable plastics with high starch content, which are widely marketed in China, have both partial biological degradation function and partial oxidation function. How to accurately define and classify EDP should be studied by manpower to facilitate the adoption of corresponding detection methods Evaluate its degradation performance and promote it to the market orderly

the composting treatment of organic wastes has become a very important direction for the recycling of waste treatment in the world. Developed countries such as Europe, the United States and Japan have promulgated the test methods and certification marks for biodegradable composting. China should also organize human resources to carry out field composting tests with the environmental sanitation department and the agricultural department in addition to the laboratory simulation tests for the degradable plastic products with high starch content developed in China, so as to obtain reliable data, identify the feasibility of composting, and facilitate market promotion

based on the national conditions, various degradable plastics developed and marketed in China have their own positioning according to different degradation mechanisms and environmental conditions, and have played a certain role in reducing environmental pollution, alleviating environmental contradictions and supplementing alternative resources. However, the process formulation, controllability of degradation and rapid degradation still need to be further improved. From the strategic perspective of sustainable development, Biodegradable plastics will be the main industry in the future, and the cobalt industry also belongs to the development direction of the upstream material end of the new energy industry chain. At present, its main problem is that the high price has become a barrier to popularization and application. Scientific research investment and application development should be strengthened to further reduce costs

there is no contradiction between reduction and recycling. Plastic wastes that are easy to be recycled and have good economic benefits should be recycled and reused. It is considered a wise choice to develop and recommend the use of EDP even if they are not collected or not suitable to be collected or even if they are forcibly collected, recycled and reused, with little economic benefits and disposable plastic wastes. At present, recycling and degradation has become an important measure to reduce the environmental load of plastic waste. The two are complementing each other, contributing to the treatment of the negative impact of plastic waste on the environment, and promoting the coordinated development of the plastic industry and the environment

it is a global hot spot and urgent task to protect the earth's environment and take the path of sustainable development. In order to promote the development and utilization of EDP, we should actively report and reflect the problems to the leaders of relevant departments, strive for support and support. At the same time, we should strengthen exchanges and cooperation at home and abroad to promote the healthy and smooth development of degradable plastics in China

3. Metal packaging

(1) tinplate cutting production technology

coil tinplate is cut into sheets of various sizes, including sawtooth shape

the technology and process fully meet the needs of the domestic industry, especially for longitudinal and triangular shearing of tinplate, chromium plated iron, aluminum, etc. the key parts are controlled by computer. The shearing plate has a wide range of thickness, many varieties, fast speed and high precision. The whole life process has a high degree of automation, good process performance, stable product quality, and conforms to international standards

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