The hottest plastic flexible packaging also needs

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Plastic flexible packaging also needs environmental protection

with the impact of the wave of environmental protection, consumers have put forward higher and higher requirements for commodity packaging. Green packaging is the need of international environmental protection development trend, and also represents the development trend of packaging industry in various countries. It is one of the important contents to improve product market competitiveness and avoid new trade barriers

China's plastic flexible packaging industry has developed rapidly and almost immediately. At the same time, it has also strongly promoted the progress of food, daily chemical and pharmaceutical industries. In turn, the progress of these industries has further stimulated the market demand for plastic flexible packaging films

with the continuous improvement of materials and processing technology, Gravure plastic flexible packaging is playing an increasingly important role in many fields. People's life has been inseparable from shopping bags, commodity bags, garbage bags, refrigerator fresh-keeping bags; Plastic flexible packaging film is also widely used in industrial products packaging, household goods packaging, clothing packaging and pharmaceutical packaging

in line with this, the greening of plastic flexible packaging film has also become one of the important development trends. Maximum clamping width of flat sample: 75mm; At present, there is no completely unified definition of green packaging. Generally speaking, appropriate packaging that can be recycled, recycled or degraded, and does not cause public hazards to human body and environment in the whole life cycle of products is called green packaging. The most important meaning of green packaging is to protect the environment, but also has the significance of resource regeneration

strengthening recycling and reuse and realizing the ecological circulation of packaging waste are the most powerful measures to reduce environmental pollution. In the whole life cycle of green packaging, the principles of economic activities such as reduction, reuse and recycling of circular economy are followed to minimize the impact of packaging on the environment. In recent years, progress has been made in the recycling and reuse of plastic waste, and the problem of secondary pollution has been gradually solved

the regulations on packaging waste vary from place to place, but there is a common principle: on the premise of meeting the packaging function, we should try to reduce the amount of waste, that is, we should encourage the use of less raw materials. In packaging design, we should try to use the same materials, separable and coexisting materials, and tend to use materials with simple structure and easy recycling. Therefore, the development trend of lightweight packaging film is presented. The key technology is to use new raw materials with super toughness, which can process thinner films and are easier to process, such as bimodal polymer HDPE, polyolefin with metallocene catalyst and high-quality barrier packaging materials

with the improvement of technical level, the domestic plastic flexible packaging industry has made a lot of progress in reducing waste pollution. With the gradual implementation of relevant domestic environmental protection regulations, greater progress will be made this year. For example, the use of heat sealable stretch film and cover varnish can significantly reduce the amount of materials, which has been widely used in the packaging of cold drink ice cream; By using metallocene polyolefin with high strength, the thickness of the whole packaging film is successfully reduced; The phenomenon of over packaging is also gradually reducing; The application of coextrusion technology and equipment is also becoming more and more popular, which solves the problem of accurately controlling the thickness of each layer of film. The thickness of barrier layer with high price can be controlled very thin, and the freshness preservation performance can be doubled or even dozens of times

in addition to doing enough work in recycling, countries all over the world have recognized the importance of environmental protection, so they have made efforts in degradable green packaging film, and new products emerge in endlessly

(1) edible film edible packaging film is a film with porous network structure formed by the interaction between different molecules with natural edible substances (such as polysaccharides, steel wire and steel wire rope manufacturers need to show users the quality, safety and performance of their products, proteins, etc.) as raw materials. Such as chitosan edible packaging film, corn protein packaging film, modified cellulose edible packaging film and composite edible packaging film, edible film can be applied to the inner packaging of various instant foods, and has a huge market in the food industry

(2) degradable film mainly solves the contradiction that it is difficult to recycle waste and non degradable packaging materials. Buried underground will damage the soil structure, and incineration will produce toxic gases and cause air pollution. Degradable plastic packaging film not only has the functions and characteristics of traditional plastics, but also can be split and degraded in the natural environment through the action of microorganisms in soil and water or through the action of ultraviolet rays in sunlight after the service life is completed, and finally re-enter the ecological environment in the form of reduction and return to nature. The varieties developed in China have covered photodegradation, photodegradation, photodegradation, high starch content biodegradation, high calcium carbonate filled photodegradation, total biodegradation and other categories. Degradable plastic products have been widely used in packaging, such as ordinary packaging films, shrink films, shopping bags, garbage bags, etc., and have played a positive role in improving the environment

(3) water soluble film water soluble plastic packaging film, as a new green packaging material, is widely used in the packaging of various products in Europe, America, Japan and other countries, such as pesticides, fertilizers, pigments, dyes, detergents, water treatment agents, mineral additives, detergents, concrete additives, photographic chemicals and gardening care chemicals. Water soluble films have been widely valued by developed countries in the world because of their environmental protection characteristics, such as complete degradation, safe and convenient use. At present, foreign enterprises mainly produce and sell such products in Japan, the United States, France and other countries, and domestic enterprises have also been put into production, and their products are going to the market

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