Plastic film enters the ranks of green environmental protection

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 materials and processing technology, gravure plastic flexible packaging is playing an increasingly important role in many areas. People's lives are inseparable from shopping bags, merchandise bags, garbage bags, and refrigerator storage bags; and industrial products packaging. , Household daily necessities packaging, clothing packaging, pharmaceutical packaging also uses a large number of plastic flexible packaging film.

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. In general, moderate packaging that can be reused, reused, or degraded, and that does not pose a hazard to the human body or the environment throughout the product's lifecycle is called green packaging. 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. During the entire life cycle of the green packaging, it follows the economic activity principle of reducing, reusing, and reusing circular economy, so that the impact of packaging on the environment is minimized. 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. Therefore, the development trend of lightweight packaging films is presented. The key technology is the use of new materials with super toughness that can process thinner films and are easier to process, such as bimodal polymer HDPE, polyolefins with metallocene catalysts and high-quality Barrier packaging materials.

The domestic plastic flexible packaging industry has made many progresses 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 enough work in recycling, countries all over the world have recognized the importance of environmental protection, and therefore have made efforts in degradable green packaging films. New products are emerging in an endless stream.

Edible film edible packaging film is a film with a porous network structure formed from natural edible substances (such as polysaccharides, proteins, etc.) as raw materials and through interactions 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.

The biodegradable film mainly solves the difficulty of the recovery of discarded and non-degradable packaging materials. Buried underground will damage the soil structure, and incineration processing will produce toxic gas and cause air pollution. The biodegradable 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 the soil and water or the ultraviolet rays in the sunlight after the service life is completed, and finally be restored in a reduced form. Enter the ecological environment and return to nature. 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 ordinary packaging films, shrink films, shopping bags, garbage bags, etc., and have played an active role in improving the environment.

Water-soluble film Water-soluble plastic packaging film is a novel green packaging material that 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, minerals Additives, detergents, concrete additives, photographic chemicals, and chemical reagents for gardening. The water-soluble film has been extensively emphasized by developed countries in the world because of its 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.