Development and promotion measures of the hottest

2022-07-27
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Development and promotion measures of green packaging materials (II)

Paper Village shaking has always been considered as an environmentally friendly material, which 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. It does not contain fluorescent agents and chemicals harmful to human body. Plmex made of paper is only waterproof, oil-proof, anti sticky and heat-resistant, and can be washed 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. 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

the United States collegefarm brand candy adopts the biodegradable resin polylactic acid (PLA) nature 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 with crystalline 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 has adopted planatureworks film, with a production capacity of 1300 pieces/min. The Danish Faerch plastic company invented to use polylactic acid as the packaging material. The new products are suitable for packaging low-temperature fresh food, including various pasta, internal and salad. The current packaging products of Faerch company include various plates and bottles. The original processing resins that can be heat sealed and packaged are PS, PP and pet. The adoption of 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. The degradable material successfully developed by the company belongs to polyester polymer. Lactic acid can be extracted from the sugar liquid fermented by sugar beet 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. It can be completely decomposed into water and carbon dioxide without any harm to the environment. In November2004, the degradable poly (lactic acid) material developed by Shanghai Xinli Industrial Microbiology Technology Co., Ltd. in cooperation with the school of materials 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. LLC of the United States uses corn to produce biodegradable plastics. The process is as follows: first, grind the corn into powder, separate the starch, and then extract the original glucose from the starch. Lactic acid is produced by anaerobic fermentation with Lactobacillus. The fermentation liquid 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 600million 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, wicker, reed, crop straw, straw, wheat straw, etc. are easy to decompose in the natural environment; It does not pollute the dusty environment, and has renewable resources and low cost. Bamboo packaging materials can be reduced, such as hollow bamboo boxes. 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. The waste can be degraded naturally. The whole process of bamboo cutting, bamboo processing, bamboo packaging material manufacturing and use, waste recycling or degradation will not cause harm to human body and the environment, which conforms to the 3rid principle of green packaging and the requirements of life cycle analysis (LCA). Bamboo plywood has the characteristics of high strength, low price, light weight, easy recycling of waste and no environmental pollution. It is an excellent green packaging material. Bamboo plywood is based on the fact that the bamboo fiber strip structure in the medical implant and medical device industry is perpendicular to each other. It is woven into a sheet according to the longitude and latitude and then dried, glued, assembled and hot pressed. The bamboo plywood made has good physical and chemical properties, large product size, small difference in physical and mechanical properties in the vertical and horizontal directions, high strength and good moisture resistance

4. Environmentally friendly packaging of food waste

according to New Scientist magazine, biochemists of Hawaii natural energy research institute made food waste into a biodegradable polymer, which researchers playfully called "perfect plastic". This kind of plastic that can be degraded in a short time is widely used. It can not only be used to make bottles, bags and other packaging materials, but also be made into capsule coats of drugs. According to new scientist, citing the biochemist of Natural Energy Research Institute, the raw material of new degradable plastics is the mixture of water and various food wastes. Each 100kg mixture can produce 22~25kg of degradable plastics. This is usually taught from the aspects of concept generation, principle and physical meaning, which not only greatly reduces the production cost

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