We choose different types of plastic containers to pack […]
We choose different types of plastic containers to package food, chemicals and other products. First, we need to determine whether the material of the packaging material meets the product requirements and whether the material composition of the selected plastic container meets the requirements. To do this, we first need to understand the basic ingredients of plastic containers.
Plastic is a high-molecular organic material that uses resin as its main component and is formed into a certain shape under a certain temperature and pressure, and can maintain a predetermined shape at normal temperature. Resin refers to an organic polymer that usually has a range of conversion or melting when heated, and has fluidity under the action of external forces during conversion. It is a solid or semi-solid or liquid organic polymer at room temperature. It is a basic plastic and an essential and essential component. Broadly speaking, any polymer that is the basic plastic material in the plastics industry can be called a resin.
The term resin is named after lipids secreted by animals and plants, such as rosin, shellac, etc. At present, resin refers to polymers that have not been mixed with various additives.
Generally, the resin accounts for about 40% to 100% of the total weight of the plastic container. The basic properties of plastic products are mainly determined by the nature of the resin, but additives also play an important role. Some plastic products are basically composed of synthetic resins and contain no or little additives, such as plexiglass, polystyrene, etc. The so-called plastic product is actually a kind of synthetic resin. Its shape is similar to that of pine resin in natural resin, but it is called plastic product because it is synthesized by chemical force.
There is currently no exact classification of plastics for different types of plastic containers, and the general classification is as follows: Thermoplastics according to the physical and chemical properties of plastics: Plastics that can be repeatedly heated to soften and cool and harden within a specific temperature range. Such as polyethylene plastic, polyvinyl chloride plastic. Thermosetting plastic: Plastic that can be cured into insoluble and insoluble materials due to heat or other conditions. Such as phenolic plastic, epoxy plastic, etc.