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With the impact of the environmental protection wave, consumers have increasingly higher requirements for product packaging. Green packaging is a requirement for the development of international environmental protection. It also represents the development trend of packaging industry in various countries, and is one of the important contents of improving product market competitiveness and avoiding new trade barriers. Corresponding to this, the greening of plastic flexible packaging films has become one of the important trends.
There is not a completely unified definition of green packaging. Generally speaking, it is possible to recycle, re-use or decompose corruption, and not to cause harm to the human body and the environment during the entire life cycle of the product. The most important meaning of green packaging is to protect the environment, but it also has the significance of resource regeneration.
Strengthening recycling and reuse, and achieving ecological recycling of packaging waste are the most powerful measures to reduce environmental pollution. Green Packaging follows the principles of circular economy, reduction, reuse, and resource-based economic activity during its entire life cycle, minimizing the impact of packaging on the environment. In recent years, progress has been made in the recycling and reuse of plastic waste, and the secondary pollution problem has been gradually solved.
Packaging waste regulations vary from place to place, but there is a common principle that the amount of waste generated should be minimized on the premise of meeting the packaging function, that is, the use of raw materials should be encouraged. In the packaging design, the same material should be used as much as possible, the coexisting materials can be separated, and tends to use a material that is simple in structure and easy to recycle. As a result, the key technology for the development of lightweight packaging films is the use of new materials with super toughness that can process thin films and are easier to process, such as bimodal polymers.
HDPE, polyolefins with metallocene catalysts and high-quality barrier packaging materials.
The domestic plastic flexible packaging industry has made notable progress in reducing waste pollution. With the gradual implementation of relevant domestic environmental laws and regulations, more progress will be made this year. For example, the use of heat-sealable stretched film plus varnish significantly reduces the amount of material used, has been used in a large number of applications for cold drink ice cream packaging, and has successfully reduced the thickness of the entire packaging film by using high-strength metallocene polyolefins. The phenomenon of over-packaging is also being gradually reduced; coextrusion compounding technology and equipment applications are also becoming more and more popular, which solves the problem of precise control of the film thickness of each layer, and the barrier layer thickness with high price can be controlled to be very thin, and the fresh-keeping performance is also preserved. Doubled or even several decades of improvement.
In addition to doing a good job in recycling, countries all over the world have recognized the importance of environmental protection. They have made unremitting efforts in degradable green packaging films and launched many new products.
Edible film
Edible packaging films are made of natural edible substances (eg, polysaccharides, proteins, etc.) and have a porous network structure formed by the interaction between different molecules. Such as chitosan edible packaging film, corn protein packaging film, modified cellulose edible packaging film and composite edible packaging film, etc., edible film can be applied to the inner packaging of various ready-to-eat foods, in the food industry huge market.
Degradable film
It is mainly difficult to recover the packaging materials that are discarded and difficult to degrade. The buried soil will destroy the soil structure, and the incineration will cause the air pollution caused by toxic gases. Degradable plastic packaging films not only have the functions and characteristics of traditional plastics, but also can be 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. Domestic research and development of the variety has covered photodegradation, photobiodegradation, photo-oxygen biodegradation, high-starch content biodegradation, high calcium carbonate filled photo-oxygen degradation, and biodegradation. Degradable plastic products have been used in packaging applications such as general packaging films, shrink films, shopping bags, garbage bags, etc., and play an active role in improving the environment.
Water soluble film
Water-soluble plastic packaging film as a novel 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, washing Agents, concrete additives, photographic chemicals, and gardening chemicals. Water-soluble films have been highly valued by the developed countries in the world because of their environmental characteristics such as thorough degradation and safe and convenient use. At present, foreign countries, mainly Japan, the United States, France and other countries, produce and sell such products, and domestic companies have already put into production. Their products are moving toward the market.
"Greening" Plastic Flexible Packaging Films
In recent years, China's plastic flexible packaging industry has been rapidly developed, but also strongly promoted the progress of food, daily chemical and pharmaceutical industries. These industry advances in turn further stimulated the market demand for plastic flexible packaging film. With the continuous improvement of material properties and processing technology, gravure plastic flexible packaging is playing an increasingly important role in many areas. People's lives can not be separated from shopping bags, merchandise bags, garbage bags, refrigerator storage bags, and industrial products Packaging, household daily necessities packaging, clothing packaging, pharmaceutical packaging also uses plastic flexible packaging film.