Classification and Application of Green Packaging Materials (I)

The revolution in science and technology not only brought about rapid development for social productivity, but also created tremendous material wealth for mankind. At the same time, it also created unprecedented destructive power and caused serious pollution to the ecological environment. The packaging industry is one of the important industries that cause pollution. To solve the pollution problem in the packaging industry, a “green revolution” is emerging in the packaging industry.

The rise of green packaging originated from the proliferation of white pollution. The root cause lies in the increasing packaging waste that comes with the increasing availability of packaging materials and packaging products. Because people ignore the environmental factors in the production and management activities, they ignore the intractable plastic packaging products, and do not recycle the recycled packaging products, causing serious environmental pollution.

"Green revolution" is a major change in the world packaging industry, and it is also a major trend in the development of the packaging industry in the new century. It has become an irreversible trend in commodity production and world trade. This kind of change is the inevitable result of adapting to environmental protection and saving resources in all aspects of concepts, materials, production, and consumption. The main contents of the “green revolution” in the packaging industry include: reducing unnecessary waste, providing renewable products, paying attention to economic benefits and ecological benefits, and not using products that pollute the environment and destroy nature. About the definition of green packaging and grading goals

For the green packaging, the following four aspects are connotated: the material is the most provincial, the least waste, and saves resources and energy; easy to recycle and recycle; the waste burns to produce new energy without secondary pollution; the packaging materials are least and Decompose on your own without polluting the environment. Based on this, we can give the following definitions for green packaging; we can call it green packaging, which can recycle, re-use or degrade, and appropriate packaging that does not cause harm to the human body and the environment throughout the product's life cycle. .

Green packaging is ideal packaging, and it takes a process to fully meet its requirements. In order to achieve both the direction of the pursuit and the goals that can be achieved in stages, we can formulate green grading grading standards according to the green food grading standards.

Grade A green packaging: refers to waste that can be reused, reused or degraded, and contain toxic substances within the specified limits.

AA grade green packaging: refers to the waste can be recycled, reused or degraded, and does not cause harm to the human body and the environment during the entire product cycle. The toxic substance content is moderately packaged within the specified limits. The main considerations of the above classification are the waste problems after packaging and use. This is a hot spot for the protection of the environment in the world and is also the main content of the development of green packaging. On this basis, the pollution in the packaging production process is a Efforts have been made for many years, but problems still need to be resolved.

Green packaging design and material classification

Green packaging products are also called friends of environment packaging or ecological packaging. They are harmless to the ecological environment and human health. Packaging products must be comprehensively measured from the selection of raw materials, manufacturing, use, recycling, and disposal of products to ecological compatibility. Environmental protection requirements, and can maintain a virtuous circle in the natural ecosystem. According to this principle, some professionals have proposed six aspects of the design of green packaging:

1. Package designers should use green packaging materials and design life-span packaging materials as much as possible, which can greatly reduce the environmental pollution caused by discarded packaging.

2, reduce the packaging. Minimize the use of materials in packaging design, eliminate unnecessary packaging, and promote simple packaging to save resources.

3, the packaging material is simple. Use as few materials as possible. Do not mix dissimilar materials for recycling.

4, the packaging design can be disassembled. Packagings that require a composite material structure should be designed as a detachable structure that facilitates recycling after disassembly.

5, packaging materials can be reused. Use recyclable, multiplexed, and recycled packaging to increase the life cycle of the package and reduce packaging waste.

6, the harmlessness of packaging materials. The regulations prohibit the use or reduction of the use of packaging materials containing certain harmful ingredients and stipulate the content of heavy metals.

Green packaging materials are divided into the following categories:

1. Repeated reuse of reusable and recyclable packaging materials, such as glass bottles for beverage packaging, can be used repeatedly. Recycling, that is, regeneration after recycling, there are two methods of regeneration: one is the physical method, refers to the direct and thorough purification and smash, without any residual contaminants, the treated packaging material is used to regenerate packaging containers; the other is The chemical method means that after the recovered plastic is pulverized and washed, the depolymerization agent is used to depolymerize into a monomer or partially depolymerize into an oligomer under the action of a basic catalyst, and the monomer or oligomer is polymerized and regenerated after regeneration. Packaging Materials. The repeated use and regeneration of packaging materials only prolongs the service life of polymer materials as packaging materials, and when they reach the end of their useful life, they still have to deal with waste disposal and environmental pollution. 2. Edible packaging materials Synthetic edible packaging film matured is the pullulan resin that has been industrialized in the 1970s. It is a non-ionic, non-reducing, stable polysaccharide that is easily dissolved in water and is colorless. Odorless, non-toxic, tough, high oil resistance, can eat.

3. Degradable materials Degradable materials are plastics whose chemical structure changes in a specific environment that causes performance loss in a specific period of time. It not only has the functions and characteristics of traditional plastics, but also can be split and degraded and reduced in the natural world through the action of ultraviolet light in the sunlight or the micro-environment in the soil and water after the service life is completed, and finally reenters the ecology in non-toxic form. In the environment, return to nature.

4. The raw material of paper waste potato is mainly natural plant fiber. It will rot quickly in nature and will not cause pollution to the environment. It can also recycle paper. Pulp molded products not only have the advantages of light weight, low cost, shock resistance, etc., but also have the characteristics of good air permeability, and are widely used in the packaging of fragile, fragile, and afraid of extruded articles.

(to be continued)