Explanation of heat shrinkable film's special treatment method and classification

The memory property of heat-shrinkable materials can be used to make heat-shrinkable pipes, films and profiles. Its main feature is that it can be wrapped on the outer surface of objects by heating and shrinking, and it can play the roles of insulation, sealing, protection and connection. The radial shrinkage rate of shrinkage materials can reach 50% ~ 80%. With these excellent properties, heat shrinkable materials are widely used in the sealing of chemical and petroleum pipelines, the insulation protection of joints of household appliances, control cables, communications and power cables, and the shielding connection and insulation sealing of electrical components.

Heat shrinkable material, also known as polymer shape memory material, is an intelligent material combining polymer material with radiation processing technology, that is, a functional polymer material made of rubber and plastic materials by mixing, molding, crosslinking, heating, expanding and cooling. Ordinary polymer materials, such as polyethylene and polyvinyl chloride, are usually linear structures, which will have a special "memory effect" after being transformed into a network structure by radiation from radioactive sources such as electron accelerators, and the expanded and cooled materials can shrink back to their original shapes after being heated.

Heat shrinkable film has been widely used in industry and life, and it can play its packaging function in food or other articles. So, what heat treatment methods are there in heat shrinkable film?

First, the packaging of heat shrinkable film was tested at different temperatures. If the packaging is normal and there is no packaging, it means that the heat treatment of heat shrinkable film is qualified.

2. heat shrinkable film is a qualified shrink film only if it can maintain a stable posture under high temperature working conditions.

Third, a good heat shrinkable film should be tested at a high temperature of 500 degrees. It should be packaged at different temperatures to see if it is dissolved. If it is, it will prove that the quality of heat shrinkable film is not up to standard. If it is all normal, heat shrinkable film can be put into use.

Heat shrinkable film is a kind of packaging used for all kinds of products, which plays an important role in stabilizing, covering and protecting products, and has an important influence on the sales and transportation of products. Shrinking film has good wear resistance and shrinkage, and it is close to the appearance of products in the process of shrinking packaging, which is beautiful and convenient.

Shrinkage film can present more and more beautiful effects and stronger functions. With the improvement of quality of life and the diversification of packaging films, the requirements for shrinkage film are getting higher and higher. heat shrinkable film is used for the sales and transportation of various products, and its main function is to stabilize, cover and protect products. Shrinkage film needs to have good puncture resistance, good shrinkage and corresponding shrinkage stress. In the process of shrinkage, the film cannot produce holes. Because shrink film is often suitable for outdoor use, it is necessary to add UV anti-ultraviolet agent. It has good flexibility, not easy to be damaged, strong blasting resistance, good impact resistance, good tear resistance and strong tensile force, and can replace box packaging.

The shrinkage rate is large, and the articles can be tightly wrapped after thermal shrinkage. If the PE straight-through bag (with openings at both ends) is made after thermal shrinkage, the articles can be lifted at both ends of the opening, which can bear the weight of 15KG and is convenient to carry. Good transparency, light transmittance of 80%, can display products, can promote products invisibly, and also reduce distribution errors in logistics links. Not afraid of water and dust, it can not only achieve packaging effect, but also beautify and protect products.

There are many classifications in heat shrinkable film, including POF heat shrinkable film, PVC shrink film, PE shrink film, etc. Different types of shrink films have different characteristics, which are reflected in the following three points:

1. PE shrink film: It has excellent flexibility, tear resistance and high shrinkage rate, and is suitable for alcohol, mineral water, various beverages and so on.

2. POF heat shrinkable film is a kind of packaging film with high surface gloss, good flexibility, low carbon, environmental protection and wide applicability. With the application of POF heat shrinkable film process, POF heat shrinkable film has gradually replaced other films and become a mainstream packaging film.

Third, PVC film. It has the characteristics of good transparency and luster.