Green Packaging Materials Application Analysis and Promotion Measures

The two meanings of “green packaging” are: 1) The entire packaging process will not cause pollution and damage to the ecological environment and human health; 2) The packaging materials used must be sustainable development materials that can be recycled and used. Therefore, green packaging materials must be taken from nature and returned to nature. Green packaging began in the last century, the proliferation of white pollution, but the governance of white pollution is not to curb the development of the packaging industry, but to promote the rational use of packaging materials, type and quantity, and the effective recycling of packaging waste. First, green packaging materials and classification Green packaging materials are packaging materials that we manufacture, manufacture, use, and recycle, are harmless to human health, have good protection for the ecological environment, and are used for recycling. For example, polypropylene, corrugated paper, edible glutinous rice paper, corn paper, edible recycled plastic wrap, and our daily paper packaging products and paper handbags, paper cups, paper lunch boxes and so on. In short, various kinds of biodegradable plastic product packaging and raw materials that can be dissolved or polymerized, etc. Degradable plastic product packaging uses photosensitizers to degrade polymerized, biologically or chemically degraded plastics and other packaging items. This is an important aspect of our choice of packaging materials. Nowadays, new types of green packaging materials (biodegradable materials) that are researched and developed globally are all proposed for “white pollution,” which is difficult to handle. Therefore, the green packaging materials can be roughly divided according to the requirements of environmental protection and the ownership of materials after use. There are three categories: ~ Recyclable materials, including paper, paperboard materials, molded pulp materials, metal materials, glass materials, general linear polymer materials (plastics, fibers), and biodegradable materials Secondly, it is a material that can be naturally weathered and returns to nature, including: 1. Paper product materials (paper, paperboard, molded pulp materials); 2. Degradable materials (photodegradation, biodegradation, oxygen degradation, light / Oxygen degradation, water degradation) and biosynthetic materials, grass, wheat straw filling, shell filling, natural fiber filling materials, etc.; 3. Edible materials. Thirdly, quasi-green packaging materials can be recycled and incinerated without polluting the atmosphere and possibly Recycled materials, including linear polymers, net polymer materials, partially composite materials (plastic-metal), Plastic), (a plastic paper). Second, the development of green packaging materials 1, green packaging printing paper The four pillars of modern packaging are paper, plastic, metal, and glass. Among these four kinds of packaging materials, paper products have the fastest growth, paper and plastic are the cheapest, raw materials are widely available, and are not as fragile as glass, and they are not as heavy as iron and are easy to carry. Therefore, paper and plastic packaging are widely used in daily life. According to international health organizations and domestic environmental protection experts, plastic waste may cause achromatic pollution and is not conducive to environmental protection. Therefore, the use of plastic food bags should be gradually banned, and green paper bags must be used. In the future, we must use non-toxic and harmless paper-friendly bags. Paper packaging materials are not only rich in resources, easy to recycle, but also easy to degrade. After paper products are corrupted, they can be used to recycle recycled paper or as fertilizer for plants and reduce air pollution. Therefore, in comparison with the other three plastics, metals, and glass packagings, LCA (Cyclic Cycle Assessment) technology is used for quantitative evaluation, and paper packaging will become the most promising green packaging. One of the materials. Cartons, paper bags, paper drums, pulp molded products have become an important part of the modern packaging industry. Paper packaging containers are widely used in transportation packaging and food packaging because of their characteristics of light weight, easy processing, low cost, and easy recycling of wastes. At present, the output of paper and paperboard is increasing year by year. Packaging paper and paperboard account for more than 50% of the total output of paper and paperboard. The per capita consumption of paper has become an important indicator of the economic development level and civilization of a country. In the proportion of materials used for packaging products in countries all over the world, the use of paper accounted for the first place. Many papermaking companies in Japan have researched and produced green packaging EDBU paper for the printing and packaging industry, and have been active in the green packaging product market. Japan N1 Ppon Paper Co., Ltd. has developed and developed fully natural fiber as its raw material. Its product name is “Npimo1 d Paper deep-drawn paper, and its stretchability is 5-10 times that of plain paper. This press paper can suppress text when it is molded. , pattern and three-dimensional surface, similar to the processing of plastic products, the smooth processing of its convex image can achieve a better seal.The product can be made using the current plastic product equipment, according to the design program, press molding.Because there is no need to heat before processing soften , can increase production efficiency and save energy.Cha1] Enge Fi ve Co., Ltd. introduced biodegradable films and envelopes produced by MiT Sub1 Sh1.The film and letters are also derived from polylactic acid extracted from corn starch. In production, soy ink can be used for offset EDBU.Dyn1 C Co., Ltd. uses corn starch and fatty polyester as raw materials to develop a biodegradable flexible sheet “Au Pa1 r C0rn Sheet” with the goal of eventually replacing PVC. This material is easy to machine and cut, easy to EBB0, and its thickness can be adjusted according to the requirements. Landfill disposal does not pollute the environment. Because of the low calorific value during incineration, no toxic substances such as dioxins are produced, so it is less harmful to the environment. The latest application market for new paper packaging is alcohol packaging. For example, Japan is now popular in the carton packaging instead of glass bottles as alcohol packaging. Western countries also use paper materials to package wine and fill it into Tetra Pak's aseptic brick cartons. The reason why the Tetra-aseptic bricks are used is mainly because the Tetra Pak has the advantages of safety, durability, non-breakable and explosion, and is easy to carry and easy to open. In addition, one of its outstanding features is that it is composed of 6 layers of composite materials, which enhances the tightness and enhances the anti-alcohol leakage and volatilization of the package. At the same time, it can also block direct sunlight and prevent deterioration. Another insurmountable traditional paper packaging is oil packaging, because the oil molecules are extremely small and can easily seep through the paper packaging to the surface. Japan recently developed a boxed cooking oil compound carton, with paper as the substrate, made of aluminum-plastic composite 6 layers, and its structure is: PE / paper / PE / AL / PETIPE. The package made of the composite material is not only lightweight, safe, but also suitable for printing, so the packager can print a beautiful pattern on the box to improve the value of the product. A Japanese company has developed a wrapper that has a dehydrating function without heating or additives. Its packaging paper, called PS, can cause food tissue cells to be destroyed. It absorbs water on the surface of food by absorbing water along the intercellular space, and it can absorb the deep water inside, and also has the function of absorbing water at low temperature. In this way, the wrapper can inhibit the activity of the enzyme, prevent the decomposition of the protein, reduce the proliferation of microorganisms, achieve the effect of maintaining the freshness of the food, concentrating the umami component, removing the moisture, and improving the toughness. The use of the packaged fish and meat as a dish can reduce the heat energy for heating, prevent the deterioration of the heating oil, facilitate the conditioning process, and does not lose the umami taste due to freezing. The mechanism of the packaging paper is that the semipermeable membrane that can only pass through water is selected as the surface material, and the inner side is placed with the osmotic pressure material and the macromolecular water absorbent. Since the moisture in the food is osmotic pressure difference in the liquid state, the semipermeable membrane can be moved to the high osmotic pressure substance, so that the moisture is fixed by the polymer water absorbing agent. Paper materials have always been considered as environmentally friendly materials because they can be recycled into paper pulp. However, some paper packages add other substances to increase the strength, which affects the remanufacturability. In Europe and America, a PLMEX food-specific wrapping paper is now popular, containing no fluorescent agents and chemicals that harm the human body. The P LMEX made of paper is waterproof, oil-repellent, anti-sticky and heat-resistant, and can be rinsed with water after use. It can be used up to 50 times. BASF Chemicals Group has also developed a protective coating applied to the surface of packaging paper. This packaging paper coated with polymer dispersion is resistant to water, moisture, oil and grease. And without having to change the existing production process can be manufactured, does not affect the effect of recycling. 2. Polylactic acid packaging materials U.S. Col 1 egefa rm brand confectionery uses natural bio-degradable resin polylactic acid (P LA) NatureWorks packaging film. The appearance and performance of the film is the same as that of traditional candy packaging film (glassine or biaxially oriented polypropylene film). Transparency, excellent kink retention, EDBU JI life and strength, and high barrier properties, can better preserve the sweet scent. A few days ago, the company's high-speed kink packaging equipment has a P LANatureWorks film, production capacity of 1300 blocks / mi n. The Faerch Plastics Company of Denmark invented the use of polylactic acid as packaging material. The new product is suitable for packaging low-temperature fresh foods, including various pasta, meat and salads. Faerch's recent packaging products include various trays and bottles. The original processing resins that can be heat sealed are PS, PP and PET. Adopting this new product will put the company and its users at the front end of the packaging industry. A German company successfully developed a green food cup with rapid natural decomposition using polylactic acid as a raw material, which has opened up a practical new way to solve the problem of degradation of disposable plastic packaging. The degradable material developed by the company belongs to the polyester polymer. The lactic acid can be extracted from sugar liquid fermented from sugar beet and undergo ring-opening polymerization to form polylactic acid. Polylactic acid has become a research and development hotspot worldwide. It is a biodegradable new polymer material that is polymerized by many lactic acid molecules and can be completely decomposed into water and carbon dioxide without any harm to the environment. In January 2004, Shanghai Xinli Industrial Microbial Technology Co., Ltd. developed a biodegradable polylactic acid material cooperating with the School of Materials Science and Engineering of Tongji University, and was listed as a major industrialization project in Shanghai City for Science and Education. The production of polylactic acid is based on lactic acid. Most of the traditional lactic acid fermentation uses starch-based raw materials. At present, the United States, France, Japan and other countries have used corn, sugarcane, sugar beet, potatoes and other agricultural and sideline products as raw materials to produce lactic acid, thereby producing polylactic acid. . The process used by US LLC to make biodegradable plastics from corn is as follows: First, the corn is ground into powder, the starch is separated, and the original glucose is extracted from the starch. Then anaerobic fermentation of Lactobacillus, the fermentation process with liquid caustic soda to generate lactic acid, fermentation broth after purification, using electrodialysis process, made up to 99.5% purity of L-lactic acid. The extracted lactic acid is then made into the final polymer-polylactic acid. The annual global output of 600 million tons of corn makes it the raw material for biodegradable plastics. 3, natural biological packaging materials Natural biological packaging materials such as wood, bamboo materials, sawdust, hemp cotton, wicker, reeds, crop stems, rice straw, wheat straw, etc., are all easily decomposed in the natural environment; they do not pollute the ecological environment, and the resources are renewable and the cost is low. Bamboo packaging materials can be reduced, such as hollow-shaped bamboo baskets. Reusable and recycled (Recyc)e) bamboo packaging products can be used twice, waste can be burned and utilized, and compost can be used as fertilizer. The substance can degrade naturally (Deg radabl e). From bamboo cutting and bamboo processing to the manufacture and use of bamboo packaging materials, the entire process of recycling or degrading the waste will not cause harm to the human body and the environment. It is in line with the green packaging 3 RID principle and life cycle analysis (LCA) law requirements. Bamboo-bonded plywood is characterized by high strength, low price, light weight, easy recycling of waste, no pollution to the environment, etc. It is a kind of excellent green packaging material.The bamboo plywood is based on the vertical structure of bamboo fiber, and is woven into seats according to warp and weft. After drying, gluing, forming, and hot pressing, the bamboo plywood produced has good physical properties and chemical properties. The product has a large format, small physical and mechanical properties in vertical and horizontal directions, high strength, and good moisture resistance. 4, food waste green packaging According to the New Scientist magazine, biochemists at the Hawaii Institute of Natural Energy have made food waste a biodegradable polymer that researchers have humorously called "perfect plastic." This type of plastic, which can be degraded in a short time, is widely used, and can be used not only to make packages such as bottles and bags, but also to make capsules for medicines. According to the "New Scientist," quoted a natural chemist biochemist as saying that the new biodegradable plastic