Ecological packaging materials

(1) Plastic packaging materials Due to the rapid increase in consumption, the "white pollution" caused by the increasing serious, must take appropriate measures to carry out thorough governance, the solution is the ecologicalization of plastic packaging:

1. Degradable Plastic Packaging Materials Since the development of degradable plastics, light-reducing plastics have been decomposed into water, carbon dioxide, plastic powders or low-molecular-weight oligomers, and have become new sources of contamination. Generally, starch-destructive decomposition is slow, and decomposed fragments remain Pollution. Microbial degradation of plastic is more desirable, but the price is higher.

2. The recyclable plastic Packaging Material, polyethylene naphthalate (PEN), is more heat-resistant than PET and can withstand the sterilization conditions required for low-acid foods (116°C;, 63 minutes), while PET is only resistant to 70°C, especially It has better gas barrier and UV resistance, and has a longer shelf life and can replace glass bottles. Therefore, it has broad application prospects in packaging of beer, beverages, cosmetics, foods, etc., and is a package that can be reused.

3. Foam Packaging Materials In accordance with the "Montreal International Convention", the CFC foaming agent is banned. Foamed plastics production is moving towards a "zero ODP" and "low GWP" low-pollution process. The current development of high melt strength polypropylene (HMSPP) and polypropylene homopolymers can produce foamed polypropylene with fine micropores and even distribution. Due to its low density, it can save 20% of the same performance polypropylene sheet. The same environmental load is also reduced. In order to reduce the environmental load, bubbly packaging cushioning material substitutes have also been developed, such as bubble plastic film, paper liners, pulp molded products, and paper-plastic composite bag inflatable pads.

4. The reduction of thin-wall containers and pouch containers is an important direction for the ecologicalization of packaging materials. Instead of replacing the bottle with a film, a single film is used instead of a multilayer film, and bottles and cans are thinned to achieve reduction. Mainly through changes in consumer attitudes, ecological design, improve the quality of packaging, materials, high-strength, light weight and other measures to achieve.

(2) Edible packaging Mainly used for food and medicine packaging, using starch, protein, plant fiber and other natural materials as raw materials. The packaging is harmless to the human body, edible and has a certain strength. For example, ice cream cups, drug capsules, and the like have been used. At present, there are starch casings, starch dishes, and the like that have been developed in research and are being expanded in application.

(3) Natural organisms The development of packaging materials using natural biological resources has the characteristics of low environmental load and abundant resources. Making full use of bamboo, sawdust, hemp, cotton fabrics, wicker, reeds, crop straws, rice straw, wheat straw and other raw materials, expanding the variety of packaging, and increasing the technological content have become one of the directions of ecological packaging. For a long time, people have accepted baskets, bottles and other packaging, but due to the diversification of packaging materials and natural bio-materials packaging production technology has stagnated, gradually shrinking. In recent years, due to the improvement of environmental awareness, natural bio-packaging materials have been re-emphasized by people. For example, domestically developed polystyrene foam lunch boxes represented by crop straws and rice straw have been heat-set and bleached. Sterilization of disposable dinner plates is favored by foreign importers.

(4) Paper Packaging The advantages are more important in packaging materials. In China, paper packaging accounts for more than 50% of the total four types of packaging. However, due to the lack of forest resources in China, non-wood pulp and papermaking should be actively developed. Reeds, bagasse, cotton stalks, wheat straw, bamboo, and other wood-based papermaking should be used to expand the accelerated plantations, and the branch materials, waste materials, and processing materials should be fully utilized. Expand sources of raw materials. Through the development of new pulp enhancers and improved corrugated board structure, the paper strength is increased and the board thickness is reduced; the purpose of reduction is achieved.