The difference of PE and PVC stretch film
Stretch Film
Stretch film is also called stretch film and heat shrink film. It is a kind of packaging material that many items are now selected for packaging. And high-quality stretch film has the characteristics of high transparency, high longitudinal elongation, high yield point, high transverse tear strength, and good puncture performance. What material is the stretch film?
Judging from the development history of stretch film in my country, the material of stretch film has been constantly updated. From the original PVC stretch film to the PE stretch film, LLDPE material and so on in the mid-1920s, the materials of the stretch film show us the market demand and technical level of that era.
PVC stretch film is jointly developed with polyvinyl chloride as the basic material and DOA as an additive plastic material. This kind of stretch film was the first to be used in China due to the heat resistance, strong toughness and good ductility of additives. Although PVC stretch film is replaced by other materials in the packaging field, PVC is still an indispensable material in the production process of three-dimensional stretch film.
Later, the PVC stretch stretch film was replaced by PE stretch film. Unlike PVC stretch film, PE stretch film material is mainly polyethylene, which has good thermoplasticity and transparency. In the process of processing and synthesis, the stretch film is roughly divided into three types of PE stretch films, such as LDPE, HDPE, and LLDPE due to the different synthesis processes. PE stretch film has strong toughness, can maintain good packaging effect, and is suitable for packaging for long-distance transportation. Moreover, the PE stretch film is not easy to be shredded and is resistant to high temperatures.
Nowadays, the wrapping film led by PP material has gained wide attention in my country's packaging industry. The material of PP stretch film is polypropylene. The biggest difference from PE stretch film is the environmental protection performance of PP stretch film. The performance of PP stretch film is roughly the same as that of PE stretch film. Both have good flexibility, high temperature resistance, high tensile strength, and are not easy to be crushed by a simple crusher. In addition, PP stretch film is a recyclable material, which is conducive to the maintenance of resources and the implementation of environmental protection efforts.
However, it is worth mentioning that two kinds of stretch films, PVC and PE, are commonly used in the market. The best way to distinguish between the two is to find a roll of pvc stretch film and pe stretch film at the same time, and pull the film apart at the same time, and pull it to a certain length to loosen it. The one that shrinks back is the pvc stretch film, and the one that does not shrink is pe. Stretch film. One has good resilience and one stretches, which is the biggest difference. And you can also pass the color: it is transparent when it is torn apart, but the entire roll of PVC is slightly yellow, and pe is milky white.
PVC film appearance color
