What are the differences between PE and PVC stretch films

There are two common tensile film materials on the market: PE and PVC. Their production process and performance are very different. Let me explain the difference between PE stretch film and PVC stretch film in detail:

Density: The simple and clear judgment method is to soak in water. The density of PE tensile film is 0.91 lower than 1.0 of water, and it will float after immersion; The density of PVC stretch film is 1.45 higher than 1.0 of water, and it will sink when immersed in water. In terms of density, which is more economical, PE stretch film or PVC stretch film. For example, for the same thickness, the amount of PVC=about 1.5 times the amount of PE tensile film.

Environmental protection: From the perspective of environmental protection, PE is polyethylene, which only contains two elements: hydrocarbon and hydrogen. It is hygienic and non-toxic, and PE stretch film is more environmentally friendly. For some countries with high export requirements, PE winding film is a more recognized packaging material, and its environmental protection performance is far higher than PVC winding film. PVC is polyvinyl chloride. Due to the existence of chlorine, hydrogen chloride will be decomposed into hydrogen chloride after being exposed to sunlight for more than 100 ℃ or a long time, producing hydrogen chloride gas, which is toxic to human body.

Light transmittance: PE stretch film has good glossiness and looks clear and bright. It is slightly white due to plasticizer. The transparency of PVC stretch film is poor, the color is light yellow, and the food covered looks fuzzy.

Mechanical property stability: PE tensile film is more stable and will not change the status quo due to temperature. During the storage and transportation of PVC stretch film packaging pallet, the change of temperature will affect its existing performance, and even cause insects to stick to it due to the release of plasticizer at high temperature. In winter, the temperature will be higher. Low hardness and brittleness, brittle fracture, loss of toughness, so PE stretch film is suitable for large packaging and long-distance transportation of goods. PVC stretch film is used in specific places, such as cables. The transverse and longitudinal tensile ratio of PE stretch film is larger than that of PVC stretch film, and the mechanical stretch film is mostly made of PE.

Taste: The flame of PE stretch film is yellow, burning fast, and has the smell of candle burning. As PVC stretch film contains chlorine, the flame will be yellow green after being ignited by fire, without oil dripping. It will extinguish after leaving the fire source and has a strong pungent smell.