Development and promotion measures of the hottest

Development and promotion measures of green packaging materials

green packaging materials are packaging materials that are harmless to human health, have a good protective effect on the ecological environment and recycled in the packaging materials we produce, manufacture, use and recycle. For example, polypropylene, corrugated paper, edible rice paper, corn paper, edible recycled fresh-keeping paper, as well as our daily paper packaging products and paper handbags, paper cups, paper lunch boxes, etc. In a word, various biodegradable plastic products, packages and raw materials that can be dissolved or polymerized for ecological protection. Degradable plastic packaging materials are all kinds of plastic products and other packaging materials that are degraded and polymerized by photosensitizers and degraded by biological or chemical substances, which is an important aspect of our selection of packaging materials

new green packaging materials (degradable materials) that are vigorously studied and developed worldwide are all proposed for the "white pollution" that is difficult to deal with. Therefore, green packaging materials can be roughly divided into three categories according to environmental protection requirements and the attribution of materials after use: first, recyclable materials. It includes paper, paperboard materials, molded pulp materials, metal materials, glass materials, common linear polymer materials (plastics, fibers), as well as sub materials that can increase the proportion of recycled plastics in our own products and reduce air cooling) to understand the hot treatment of forgings. Second, materials that can be naturally weathered and returned to nature. Including: 1. Paper products materials (paper, paperboard, molded pulp materials); 2. Degradable materials (photodegradation, biodegradation, oxygen degradation, light/oxygen degradation, water degradation) and biosynthetic materials, grass, straw filling, shell filling, natural fiber filling materials, etc.: 3. Edible materials. Third, quasi green packaging materials - materials that can be recycled and incinerated, do not pollute the atmosphere and can be regenerated. Including some linear polymers, shaped polymer materials that cannot be recycled, and some composite materials (plastic metal), (plastic plastic plastic), (plastic paper), etc

1. Green packaging and printing paper

the four pillars of modern packaging - paper, plastic, metal and glass. Among these four packaging materials, paper products have the fastest growth, paper and plastic are the cheapest, and raw materials come from a wide range of sources. They are not as fragile as glass, nor as heavy as iron, and easy to carry. Therefore, paper and plastic packaging are widely used in daily life. The International Health Organization and domestic environmental protection experts believe that plastic waste may cause white pollution, which is not conducive to environmental protection. Therefore, the use of plastic food bags should be gradually banned, and environmental protection paper bags must be used for packaging. In the future, non-toxic and harmless "all paper environmental protection bags" should be used for shopping

paper packaging materials are not only rich in resources, easy to recycle, but also easy to degrade. After being processed, paper products can not only be recycled or used as plant fertilizer, but also reduce air pollution and purify the environment. Therefore, compared with the other three major packaging materials of plastic, metal and glass, paper packaging will become one of the most promising green packaging materials by quantitative evaluation with LCA (life cycle ASSM CNT, i.e. "ecological cycle assessment method"). Cartons, paper bags, paper barrels and pulp molded products have become an important part of modern packaging industry. Paper packaging containers are widely used in transportation packaging and food packaging because of their light weight, easy processing, low cost, easy recycling and disposal of waste. At present, the output of paper and paperboard is increasing year by year, and packaging paper and paperboard account for more than 50% of the total output of paper and paperboard in China. The average consumption of paper per person has become an important symbol to measure the level of economic development and civilization of a country internationally. In the proportion of materials used in packaging products all over the world, the use of paper ranks first

many Japanese paper-making enterprises have researched and produced green packaging printing paper for the printing and packaging field, which has activated the green packaging product market. Nippon Paper Co., Ltd. of Japan has developed a deep stamping paper with natural fiber as raw material and the product name is "npimold paper". Its flexibility is 5-10 times that of ordinary paper. This kind of stamping paper can press words, patterns and three-dimensional curved surfaces during molding, which is similar to the processing of plastic products. Processing its convex image smoothly can achieve better sealing. The production of this product can adopt the current plastic products equipment and be molded according to the design scheme: since there is no need to heat and soften before processing, it can improve production efficiency and save energy

challenge five Co., Ltd. launched biodegradable films and envelopes produced by MIT subishi company. These films and envelopes are also produced from polylactic acid extracted from corn starch, which can be offset printed with soybean ink. Using corn starch and fatty polyester as raw materials, dynic Co., Ltd. has developed a biodegradable soft board "au pair corn sheet". The goal is to eventually replace PVC. This material is easy to process, cut and print, and its thickness can be adjusted according to the use requirements. Waste landfilling will not pollute the environment. During incineration, toxic substances such as dioxin will not be produced due to low calorific value, so it does little harm to the environment:

the latest application market of new paper packaging is alcohol packaging. For example, carton packaging is now popular in Japan instead of glass bottles as wine packaging: Western countries also use paper materials to package wine and fill wine into Tetra Pak sterile brick cartons. The reason why Tetra Pak sterile bricks are used is mainly because this Tetra Pak has the advantages of safety, quality assurance, non fragility and explosion, and is easy to carry and open. In addition, its outstanding feature is that it is composed of six layers of composite materials, which enhances the sealing performance. It also enhances the anti alcohol leakage and volatilization function of packaging; At the same time, it can block direct sunlight and avoid deterioration. Another insurmountable aspect of traditional paper packaging is oil packaging, because oil molecules are very small, and it is easy to penetrate through paper packaging to the surface. Recently, Japan has developed a kind of composite carton containing edible oil, which is made of paper as the base material and six layers of aluminum and plastic. Its structure is: high PE test accuracy/paper/PE/Al/PET/PE. The package made of this composite material is not only light and safe, but also suitable for printing, so the packer can print exquisite patterns on the box to improve the value of the product

a Japanese company has developed a kind of packaging paper with dehydration function without heating or additives. Its packaging paper, called PS, can prevent food tissue cells from being destroyed. By absorbing water along the intercellular space, it can not only absorb the water on the surface of food, but also absorb the deep water inside. It also has the function of absorbing water at low temperature. In this way, the wrapping paper can inhibit the activity of enzymes, prevent protein decomposition, reduce microbial reproduction, and achieve the effects of maintaining food freshness, concentrating fresh ingredients, removing moisture, and improving toughness. Using the packaged fish and meat for cooking can reduce the heat energy used for heating, prevent the deterioration of heating oil, facilitate conditioning and processing, and do not lose freshness due to freezing. The mechanism of the packaging paper is that the sample can only be selected through the semi permeable membrane of water as the surface material, and the osmotic material and polymer absorbent are placed on the inner side. Due to the osmotic pressure difference of water in food in liquid state, it can move to high osmotic pressure substances through semi permeable membranes. Therefore, these water is fixed by polymer absorbent

Paper Village shaking has always been considered as an environmentally friendly material. Because it can be made into pulp for recycling. However, some paper packaging materials add other substances to improve the strength, which affects the reproducibility. At present, a kind of special packaging paper for plmex food is popular in Europe and America, which does not contain fluorescent agents and chemicals harmful to human body. Plmex made of paper has only the characteristics of waterproof, oil-proof, anti sticking and heat-resistant, and can be washed and reused with clean water after use. Use up to 50 times. BASF Chemical Group has also developed a protective coating applied to the surface of packaging paper, which is water, moisture, oil and grease resistant after being coated with polymer dispersion. Moreover, it can be manufactured without changing the existing production process, and the effect of recycling will not be affected.

2. Polylactic acid packaging material

collegefarm candy in the United States uses biodegradable resin polylactic acid (PLA) natural works natural material packaging film. This film has the same appearance and performance as the traditional candy packaging film (cellophane or biaxially oriented polypropylene film), only crystal transparency, excellent kink retention, printability and strength, and high barrier, which can better retain the flavor of candy. At present, one set of high-speed kink packaging equipment of the company adopts planatureworks film, with a production capacity of 1300 pieces/min. Faerch plastic company in Denmark invented to use polylactic acid as the packaging material. The new products are suitable for packaging low-temperature fresh food, including all kinds of pasta, internal and salad. The current packaging products of Faerch company include all kinds of plates and bottles. The original processing resins that can be heat sealed and packaged are PS, P5 and laboratory space 1, which must be larger than the size P and pet of the universal experimental machine itself. 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 function using polylactic acid as raw material, which opened up a new practical way to solve the problem of degradation of disposable plastic packaging in the past. This degradable material developed by the company belongs to polyester polymers. Lactic acid can be extracted from sugar beet fermented liquid and subjected to ring opening polymerization to produce polylactic acid

polylactic acid has become a worldwide research and development hotspot. It is a new biodegradable polymer material polymerized by many lactic acid molecules, which can be completely decomposed into water and carbon dioxide, without any harm to the environment. In November, 2004, the degradable polylactic acid material developed by Shanghai Xinli Industrial Microbiology Technology Co., Ltd. in cooperation with the school of material science and engineering of Tongji University has been successfully developed, and has been listed as a major industrialization project of revitalizing Shanghai through science and education. Polylactic acid production takes lactic acid as raw material, and the traditional lactic acid fermentation mostly uses starch raw materials. At present, the United States, France, Japan and other countries have developed and utilized agricultural and sideline products such as corn, sugar cane, sugar beet, potato and so on as raw materials to produce lactic acid, and then produce polylactic acid. The technological process of manufacturing biodegradable plastics from corn by LLC in the United States is as follows: first, grind the corn into powder, separate the starch, and then extract the original glucose from the starch. Then anaerobic fermentation with Lactobacillus, the fermentation process is neutralized with liquid alkali to produce lactic acid. After purification, L-lactic acid with purity of 99.5% is prepared by electrodialysis process. Then the extracted lactic acid is made into the final polymer - polylactic acid. The global annual output of 600 million tons of corn makes it the preferred raw material for biodegradable plastics

3. Natural biological packaging materials

natural biological packaging materials such as wood, bamboo weaving materials, sawdust, hemp cotton fabrics, wickers, reeds, as well as crop stems, straw, wheat straw, etc. are very easy to decompose in the natural environment; It does not pollute the dusty environment, and the resources are renewable and the cost is low. Bamboo packaging materials can be reduced, such as hollow bamboo baskets. It can be reused and recycled, bamboo packaging products can be reused, and waste can be incinerated to use heat; Compost is rotten and can be used as fertilizer. Waste can be degraded naturally. From bamboo cutting, bamboo processing, bamboo packaging material manufacturing and use, waste recycling or