The hottest plastic packaging materials and food p

Plastic packaging materials and food packaging (Part 1)

the food industry is an important part of China's national economy. The food packaging industry is closely and inseparably linked: on the one hand, the development of food packaging is restricted by the development of food industry; On the other hand, good packaging can promote the development of a certain food industry

in China, with the development of food industry, food packaging industry has also received corresponding attention and development. Great progress has been made in food packaging materials, packaging containers, packaging theory, packaging research, packaging education, packaging design, packaging technology, packaging machinery, etc. With the continuous development of social production, the continuous improvement of people's lives, and the continuous expansion of foreign trade, especially today after China's entry into WTO, the development of food packaging plays an increasingly prominent role in the national economy and the people's livelihood. At the same time, countries all over the world also attach great importance to the development of food packaging, which has formed a worldwide technical and high-intelligent industrial field. In the past decade, China has also made a qualitative leap in food packaging, especially in the rapid development of plastic materials in food packaging

plastic is a plastic polymer material. Compared with traditional paper, metal and glass, plastic is a new packaging material. Who will pay for all kinds of packaging films, bags, barrels, boxes, bottles, cans and composite packaging materials made of plastic? " Materials, etc., are widely used in the field of food packaging, and the dosage is increasing year by year. The reason why plastic packaging materials are widely used in food packaging all over the world is that plastic packaging has different excellent characteristics from other packaging materials:

(1) it has excellent physical properties. Plastic has certain strength and elasticity, wear resistance, vibration, and certain barrier properties

(2) its chemical stability is relatively good. Most plastics are resistant to acid, alkali and chemical agents, and also have certain resistance to grease

(3) the relative density of light plastic is only 1/5 of metal and 1/3 to 2/3 of glass. The packaging container is light in weight, convenient for storage, transportation, sales, and easy to carry

(4) easy processing and molding can adopt extrusion, reverse injection, blow molding, thermoforming, composite and other processing methods to process plastic into film, sheet, hollow container, composite and other packaging products

(5) aesthetic promotional plastic is easy to be processed into various appearance shapes, which can be dyed or colored, printed and decorated. The application of transparent plastic packaging can also increase the aesthetic effect of goods, especially those materials whose shapes are not convenient for hardness tests

of course, because some plastic materials also have problems in the main aspect of health and safety, and plastic packaging waste also has a great impact on environmental protection, 4500mm wide and thick plate rolling mill has a hot load test run; December 1st, 2015. Thus, the use of plastic packaging materials in some food packaging fields is affected. However, with the continuous emergence of new plastic materials, the scope of application of plastic in food bags will be greatly expanded

I have been engaged in the marketing of plastic bag cultivation materials for more than ten years. During this period, I have contacted many front-line production staff and technicians, including employees of plastic material production enterprises and plastic packaging material using enterprises. From them, I have learned a lot about new products of plastic packaging materials, and can basically understand the development trend of domestic plastic packaging materials. On this basis, I also carefully understand the importance of plastic packaging materials, namely:

1. Mechanical properties include its tensile strength, elongation at break, impact strength, cracking strength, pricking strength, creep, stress relaxation, etc

2. Barrier and permeability include permeability, permeability coefficient, moisture permeability, moisture permeability coefficient and light transmittance

3. High temperature resistance and low humidity resistance

4. Chemical stability and hygiene. And combine the observation in practice to analyze the application of plastic packaging materials in food packaging

polyethylene (PE), which is widely used in the market, is polymerized from ethylene. Due to different polymerization methods and densities, it is divided into low-density polyethylene (LDPE), high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE). (to be continued)