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Basic information of plastic packaging

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in synthesis, 25% is used in the packaging industry. Therefore, plastic packaging is an important department in the plastic packaging industry. Plastic packaging is one of the four major materials in the packaging industry: paper and paperboard account for 30%, plastics account for 25%, metals account for 25% and glass account for 15%. The above two 25% fully illustrate the importance of plastic packaging industry. Although the plastic packaging industry is the second packaging material, its use surface is not as good as that of paper and paperboard packaging. However, the plastic packaging industry is developing at a rate of 5% every year, while other packaging materials, including paper and paperboard, metal, glass, pottery, linen and cotton, are only growing at a rate of 2%. Therefore, one day, the plastic packaging industry will surpass paper and paperboard and become the first packaging material
China’s modern packaging industry has developed rapidly since the implementation of the reform and opening-up policy. After 30 years of development, China’s packaging industry has become an independent, complete and complete industrial system with paper, plastic, metal, glass, packaging printing and packaging machinery and equipment as the main industries, and a packaging industry pattern with the Yangtze River Delta, Pearl River Delta and Bohai Bay as the key areas
in terms of the total amount of packaging industry, China is already a large packaging country, but not a powerful packaging country. It is shown that the independent innovation ability of enterprises is still weak, the added value of products is low, and the value of packaging is not fully reflected in the industrial chain. The low-level repeated construction has led to the prominent contradiction between overcapacity of low-end products and insufficient supply of high-end products, and the lack of stamina for development. China’s packaging industry needs to shift from relying solely on volume growth and expanding production capacity development to relying on scientific and technological innovation, technological progress and structural optimization to enhance the core competitiveness of industrial development. Plastic packaging bags can be divided into OPP, CPP, PP, PE, PVA, EVA, composite bags, coextrusion bags, etc
OPP plastic bag:
characteristics: hard, unchanged after pulling. Non stretchable (two-way stretching) single piece folded in half, edge sealed and welded, and the maximum length shall not exceed 640m /m. The length of single chip is 1.28M and the width is 0.6m
advantages: good transparency
disadvantages: the seals on both sides are easy to tear
PP plastic bag: Polypropylene
characteristics: the hardness is inferior to OPP, which can be stretched (bi-directional stretching) into a triangle after stretching, bottom seal or side seal (envelope bag), and barrel material. The transparency is worse than opp
PE plastic bag: Polyethylene
characteristics: formalin, poor transparency
HDPE: high density low-pressure polyethylene high density, which feels crisp and is mostly used for making vest bags
LDPE: low density high-pressure polyethylene with soft feel
PVA plastic bag: vinylon
characteristics: environmentally friendly material, which will dissolve in water. This raw material can not be produced in China. It is imported from Japan, which is expensive and widely used abroad
advantages: soft, transparent and pollution-free
CPP plastic bag:
characteristics: non toxic, godless formalin, composable, better transparency than PE and slightly worse hardness. It will grow out after pulling, with soft texture, transparency of PP and softness of PE
composite bag:
features: strong edge seal, printable, and ink will not fall off
coextrusion bag:
features: good transparency, soft texture and printability

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