In the production of self-supporting bags, non-polar, compact and smooth surface of polyolefin and other plastic film materials. It is necessary to improve the corona treatment of the predecessors to make the surface state change. Supermarket self-supporting bags, so that printing and bonding can achieve a certain degree of fastness. Non polar materials such as polyethylene and polyene are very inert. If the manufacturers of self-supporting bags do not carry out surface treatment, it is difficult for adhesives to infiltrate them. They are the same as polytetrafluoroethylene plastic king, they are also difficult to stick materials. In order to change this situation, it can be treated by various methods, such as chemical treatment, flame treatment and corona treatment, among which corona treatment is the most effective and widely used. Corona treatment is that when the film is just blown out or streamed out of rice, it is allowed to pass through an electric field of high frequency and high voltage discharge at the end of cold penetration to change its surface condition. Electrical shock or breakdown. Under the high voltage electric field, the electron current has a strong impact on the plastic film.

In the early 1990s, metallocene catalyst was used to synthesize polyolefin
It is the most remarkable progress in polyolefin industry. It has a very high activity as the catalyst for the copolymerization of cyclopentane and cyclopentane