Greenization of plastic flexible packaging process (below)

1. 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 should Has a huge market.

2. Degradable packaging 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.

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. Biodegradable plastics are generally divided into biodegradable plastics, photodegradable plastics and biodegradable plastics. Domestic research and development of products include photodegradation, photobiodegradation, photo-oxygen biodegradation, high-starch content biodegradation, high-starch content biodegradation, high-calcium carbonate filled photo-oxygen degradation, and biodegradation; The application of products in packaging has been widely used in ordinary packaging films, shrink films, shopping bags, garbage bags, etc., and has played a positive role in improving the quality of the environment.

3. Water-soluble plastic packaging 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.

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, there are mainly foreign countries such as Japan, the United States, and France that produce and sell such products. Domestic companies have already put into production, and their products are moving toward the market.

4. Strengthen recycling and reuse, and realize the ecological recycling of packaging waste

During the entire life cycle of the green packaging, it follows the principles of economic activities of “reduction, reuse, and resource recycling” of the 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: encourage the use of raw materials. In the packaging design, the same material should be used as much as possible, the materials that can coexist can be separated, and tend to use a material that is simple in structure and easy to recycle.

Under the premise of satisfying the packaging function, the amount of garbage generated is reduced as much as possible to present a lightweight development trend of the packaging film. The key technology is to use a new type of raw material such as bimodal polymer with super toughness, which can be processed thinly and can be easily processed. HDPE, polyolefins with metallocene catalysts, and excellent barrier materials.

The domestic plastics flexible packaging industry has made many progresses in reducing waste pollution. With the gradual implementation of relevant domestic environmental protection laws and regulations, more progress will be made in the future. For example, the use of a heat-sealable stretch film plus a varnish significantly reduces the amount of material used, has been used in a large number of applications for cold drink ice cream packaging, and successfully reduces the thickness of the entire packaging film by using high-strength metallocene polyolefins. Over-packaging is also being gradually reduced; coextrusion compounding technology and equipment applications are also becoming more and more popular, solving the problem of precise control of the thickness of each layer of the film, the price of the expensive barrier layer can be controlled thin, and the fresh-keeping performance is doubled Even dozens of times better.