Greening and reuse of the hottest plastic packagin

2022-08-14
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Greening and reuse of plastic packaging

as a packaging material, plastic has four characteristics: light, convenient, excellent and beautiful

packaging is light in weight, flexible in size and convenient to use. Plastic also has good mechanical strength, is not easy to break, can withstand extrusion, and meets the requirements of non broken packaging. It is made of foam plastic, which has good cushioning performance, plays the role of protecting fragile goods, and can withstand general acid and alkali chemicals. There are many transparent plastics available. It is required to be transparent. You can see the packaging of the packaged items to improve the confidence of consumers to buy. The straight peeling fixture) and so on use the orientation shrinkage of plastics to develop a shrinkage film, which plays a good role in tight packaging. In addition, according to the functional requirements of packaging, it can also have barrier property, permeability, heat resistance, cold resistance, chemical stability, hygiene, transparency and other properties to meet the needs of packaged products in many aspects

reduction and reuse of plastic packaging

reduction is to reduce resource consumption and reduce the amount of discarded products. It is the preferred way to make plastic packaging green. Under the conditions of meeting the functions of protection, convenience and sales, we will start from the source of packaging design and will take the lead in BMW's new generation 1 models in September this year to adopt the appropriate packaging with the least amount of design, so as to reduce packaging discards from the source. Therefore, an organized investigation should be carried out on the existing plastic packaging specifications and materials with a large amount and a wide range. On this basis, the following measures should be taken: improve the packaging structure design and reduce the amount of waste; Select high-strength and light-weight materials to save material resource consumption; Adopt co extrusion and foam technology to reduce material consumption; Oppose excessive packaging and advocate appropriate packaging; Limit the use of disposable packaging

recycling and reuse of plastic packaging is a recycling technology, which is an important means to effectively save original resources and energy and reduce the amount of packaging waste. It should be given special attention

Second, recycling and reuse of plastic packaging

recycling and reuse of plastic packaging is a recycling technology, which is an effective way to save raw material resources and energy, Full attention should be paid to the important means of reducing the production of packaging discards

industrialized countries such as Germany and France have enacted laws and regulations on Package Recycling and reuse, which stipulates that a deposit shall be levied on bottled containers such as beverage packaging containers, washing agents, latex paint, etc. at the same time, the law also stipulates that bottled containers that cannot be refilled and recycled shall be restricted by high tax system to promote the recycling and reuse of packaging containers

in order to use bottled containers for many times, we must pay attention to the development of sterilization, washing and dispensing technology and filling technology. Sweden and other countries can recycle polycarbonate resin bottles and cans more than 75 times due to the adoption of advanced sterilization lotion technology; In recent years, Germany has paid attention to the development of sterilization and detergent technology, and carbonate bottles and cans have been recycled and reused for up to 100 times. The United States has vigorously developed concentrated washing and blending products and heavy tank technology, and the heavy tank rate of its fabric washing and blending products has reached 40%

three plastic packaging recycling

Plastic packaging recycling and reuse are collectively referred to as plastic packaging recycling, which is a recycling technology of plastic packaging discards. Recycling is one of the most active waste treatment methods to control environmental pollution, save resources and energy, and promote the recycling of packaging materials. It is more reasonable and effective than the traditional filling treatment method, so it has become the method adopted by most countries in the world. According to data reports, compared with recycled products with plastic abandonment, it can save 85% - 95% of resin consumption and 6% - 17% of processing energy. In addition to recycling technology, the recycling technology of plastic packaging waste also includes recycling technology of recycled materials, pyrolysis and recycling of monomers or chemicals, oiling and recycling of fuel technology, incineration and recycling of heat energy technology, composting technology, etc. At present, we should focus on recycling and material recycling technology; The pyrolysis technology and oilization technology of chemical recovery and regeneration are the development direction that should be paid attention to in the future

material recovery and regeneration can be divided into direct regeneration and modified regeneration. Direct regeneration refers to the direct plasticization of waste plastics after pretreatment and crushing, and then molding or granulation. Sometimes it is necessary to add a certain amount of new resin and appropriate additives, such as antioxidant, lubricant, stabilizer, plasticizer, colorant, etc., to improve the appearance and processing performance and prevent aging. Direct regeneration can be divided into three cases: without separation, cleaning and other treatment, it only needs to be directly broken and plasticized, such as leftovers and residues in the production process; It needs pre-treatment such as separation, cleaning, drying, damage, etc. if there are contaminated plastic wastes, it is best to classify the wastes according to raw materials and plasticize them; The last one needs special pretreatment, such as foamed plastic, which is large in volume and should not be input into the processing mechanism. It should be defoaming and volume reduction before

the main processes of direct regeneration include plasticization, granulation, separation and drying. Plasticization is carried out on double track plasticizer and internal mixer, with the purpose of preparing recycled pellets, which are directly formed after plasticization. Granulation includes cold cutting and hot cutting. Cold cutting refers to the cooling of the extruded melt through a cold water tank. Separation can be manual or mechanized, such as electrostatic separation, cyclone separation, centrifugal separation, magnetic separation, etc., which is a difficult technology. For drying, a placed dryer with a heated interlayer is used, in which hot steam is used for drying while heat is collected

IV. development of degradable plastics

degradable plastics refers to adding some additives to plastics to promote their degradation function, or synthesizing plastics with their own degradation properties, or plastics made of renewable natural raw materials, which can meet the original application performance requirements in the use and storage period, but after use, its chemical structure changes significantly in a short time in a specific environment, It is a kind of plastic that causes some property loss and self degradation

degradable plastics can be divided into polymerized and blended types according to the manufacturing method, completely biodegradable plastics and destructive degradable plastics according to the degree of degradation, and photodegradable plastics, biodegradable plastics, light/biological double degradable plastics and other degradable plastics according to the degradation mechanism

V develop new environmental protection products for plastic packaging

water soluble plastic packaging film, as a novel green packaging material, is widely used in various product packages in Europe, America, Japan and other countries. Its main advantages are complete degradation, convenient and safe use, good mechanical properties, and heat sealing. With high heat sealing strength and anti-counterfeiting function, it can be used as the best weapon for anti-counterfeiting of high-quality products and prolong the life cycle of high-quality products. The main properties of water-soluble packaging film are as follows: (1) the water-soluble film rolled with water content is generally packaged in a package of PE plastic with its specific water content unchanged. (2) Anti static water-soluble packaging film is an anti-static film, which is different from other plastic films and has good anti-static performance. (3) Water and gas permeability water soluble film has strong permeability to water and ammonia, making it suitable for packaging harmful or toxic materials, but it has a good barrier type to oxygen, nitrogen, hydrogen and carbon dioxide. (4) Heat sealing water-soluble packaging film has good heat sealing property. In addition, water-soluble packaging film has good mechanical properties, printing performance, oil resistance, chemical resistance and water solubility

wood plastic composites are filled with wood fibers, and the modified materials of reinforced thermoplastics are extruded into plates, profiles and other products to replace wood and plastics. Plastic wood composites have the advantages of light weight, good dimensional stability, good heat resistance, easy processing, recyclability and good wooden appearance

synthetic paper is also called polymer paper or plastic paper. It is a packaging material made of synthetic resin as the main raw material, which is softened, extruded, extended into a film after a certain high temperature, and then processed into paper. The raw materials of edible packaging materials are natural organic small molecules and macromolecules, so it can be naturally absorbed by the human body, and can also be naturally weathered and degraded by microorganisms. It is usually made by crushing, pressing or soaking, extracting or refining its raw materials, then filtering and concentrating, and then adding a small amount of compounding agents, which is conducive to film-forming, improving strength and toughness, and processing and forming under certain technological conditions

nano packaging materials are the product of high-tech development. With the development of nanotechnology, nano materials emerge in endlessly, which provides a broader space for the development of green packaging. Recently, there are several kinds of nano materials: (1) nano transparent iron oxide series pigments, which will have a significant impact on the upgrading of traditional pigments in China. (2) The preparation technology and process of nano calcium carbonate have been successfully developed. Nano light calcium carbonate is an important inorganic filler, which can be used in high-grade inks, high-grade plastics, papermaking, special paper and rubber products. (3) Hollow nano packaging materials. The material is an inorganic compound nano material, which is characterized by hollow ribs, and its strength, toughness, wear resistance and other improvements are much higher than solid nano materials. (4) Polyester PET and PBT nano plastics, with flame retardant properties, can be used to make food, shawls, cosmetics packaging

conclusion

as people pay more and more attention to environmental issues, green packaging has increasingly become the object of attention in product packaging in the future. In today's product packaging, plastic plays an important role, and it has also become an inevitable research object for people to realize green packaging. In other words, if we solve the problem of green plastic, we will no longer see "white pollution" in our life, and our natural environment will be more beautiful

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