Why the demand for plastic bags has been rising for many years? What are the characteristics and advantages of plastic bags? With the rise of packaging, the packaging value of plastic bags is self-evident. Plastic bags have become irreplaceable in daily life due to their convenience and low cost. commodity. Today, I will show you the characteristics of some plastic bags.
1. Plastic products have a wide distribution of mechanical strength and higher specific strength
Some plastics are as hard as stone and steel, and some are soft as paper and leather. From the perspective of mechanical properties of plastics such as hardness, tensile strength, elongation and impact strength, they have a wide distribution range and have a lot of room for choice. Due to the small specific gravity and high strength of plastic, it has a high specific strength. Compared with other materials, plastics also have obvious shortcomings, such as flammability, higher stiffness than metals, poor aging resistance, and heat resistance.
Second. Plastic bags have excellent chemical stability
Most plastics have good corrosion resistance to chemicals such as acids and alkalis. In particular, polytetrafluoroethylene (F4), commonly known as the King of Plastics, is more chemically stable than gold, and it will not deteriorate even if it is boiled in “aqua regia” for more than ten hours. Because F4 has excellent chemical stability, it is an ideal corrosion-resistant material. For example, F4 can be used as a material for conveying corrosive and viscous liquid pipelines.
Third. Plastic bags are also a poor conductor of heat, which has the effect of noise reduction and shock absorption.
Generally speaking, the thermal conductivity of plastics is relatively low, equivalent to 1/75—1/225 of steel. The micropores of foam plastics contain gas, which has better heat insulation, sound insulation and shock resistance. For example, the thermal conductivity of polyvinyl chloride (PVC) is only 1/357 of steel and 1/1250 of aluminum. In terms of thermal insulation capacity, single-glass plastic windows are 40% higher than single-glass aluminum windows, and double-glass windows are 50% higher. After the plastic window is combined with the hollow glass, it can be used in residences, office buildings, wards, and hotels, saving heating in winter and saving air-conditioning expenses in summer, and the benefits are very obvious.
Fourth. The plastic bag itself is very light
Plastic is a lighter material with a relative density of 0.90-2.2. Obviously, can plastics float on the water? Especially foamed plastics, because of the micropores inside, the texture is lighter, and the relative density is only 0.01. This feature allows plastics to be used in the production of products that require lightening of their own weight.
Fifth. Plastic bags also have excellent electrical insulation properties
Ordinary plastics are poor conductors of electricity, and their surface resistance and volume resistance are very large, which can reach 109 to 1018 ohms in numbers. The breakdown voltage is large, and the dielectric loss tangent value is small. Therefore, plastics have a wide range of applications in the electronics industry and machinery industry. Such as plastic insulated control cables.
Sixth. It has good transparency and abrasion resistance;
Seventh. Plastic bags have good ductility
In addition: the advantages of plastic bags:
1. Most plastic bags have strong corrosion resistance and do not react with acids and alkalis.
2. The manufacturing cost of plastic bags is low.
3. The finished product packaging in plastic bags is durable, waterproof and light in weight.
4. Plastic particles can be easily molded into plastic bags of different shapes.
5. Plastic bags are good insulators.
