Wuhan Handern Plastic Film Polymer
DATE：2020/5/5 8:41:15 / READ： / SOURCE：This station
Wuhan Handern Plastic Film Polymer
Wangwang is a new material synthesized by chemical methods. Under certain temperature and pressure, it can be shaped into products with a fixed shape, and after cooling and pressure relief, it can still maintain this shape at normal temperature. Plastics are composed of resins and additives. Resins are divided into natural resins and synthetic resins according to the source of raw materials. Natural resins such as cellophane (cellophane), corn (biodegradable) resins, etc. Synthetic resin, such as polyethylene resin. www.handern.com breathable membrane equipment
Plastics can be divided into thermoplastic materials and thermosetting plastics according to their different properties after being heated. Thermoplastics, such as polyethylene, polypropylene, polyvinyl chloride, polyoxymethylene, etc. After they are heated, they are melted, and they can be made into plastic products by various molding methods; thereafter, if they are reheated, they can still be softened and melted, and they are molded again. During the molding process, they mainly change in physical form. Used thermoplastic products or edge materials can be recycled and copied into various recycled plastic products. Most thermoplastics can be used to make films. Thermosetting plastics such as phenol Shengwang materials, melamine plastics, melamine formaldehyde plastics, etc., when they are heated, they begin to soften and have a certain degree of hope, and they are cured and formed under higher temperature and pressure; It can no longer be melted but can only be decomposed and carbonized. During the curing process, not only the appearance has changed, but also the molecular structure has changed chemically. In this process, the linear polymer chains are cross-linked with each other, and connected into a network or body structure, so that the polymers restrict each other and lose their independent activity ability. And this process is irreversible. The used thermosetting plastic products and corner scraps can not be recycled as plastics. They can only be processed into powders and used as fillers. Thermosetting plastics are basically not used to make films. www.handern.com breathable membrane equipment
2. Thermoplastics for Wuhan Modern Film
Film forming requirements for plastics www.handern.com breathable membrane equipment
Most thermoplastics can be used to make films. However, in the industrial production of films, thermoplastics must meet the following basic requirements www.handern.com breathable membrane equipment
1) The main technological parameters of plastics, such as density, melt viscosity, melt flow rate, relative molecular mass distribution, etc., are stable during the molding process and will not show too much deviation.
2) In the film forming process, it has good melt strength; in the forming process, even if bidirectional stretching is performed, it has sufficient strength. www.handern.com breathable membrane equipment
3) During the molding process, it can be evenly plasticized. Blended with other types of resins or additives, it has good compatibility.
4) With optional molding equipment for molding processing, stable performance and strong repeatability. 5) The formed film can be subjected to secondary molding. Such as printing, punching, bonding (composite) welding, etc. The used film can be recycled without harming the environment. www.handern.com breathable membrane equipment
5) The mechanical, chemical, and optical properties of films made of thermoplastics can meet the requirements of end users. www.handern.com breathable membrane equipment
Author：admin