Plastic Caps generally use polyolefin as the main raw material, which is processed by injection molding, hot pressing and other processes. The plastic anti-theft cover not only needs to be easy for consumers to open, but also needs to avoid leakage problems caused by poor sealing performance. How to reasonably control the sealing performance of bottle caps is the focus of on-line or off-line inspection of production units.
From a process point of view, it is divided into thermoplastics and thermosetting plastics.
Thermoplastics: Plastics such as plastic mesh caps are characterized by the fact that they can become softer with increasing temperature, molded into shapes, and hardened when cooled. The process of plastic caps can be repeated many times. Its typical varieties are polyvinyl chloride, polyethylene, polypropylene, polystyrene, ABS, nylon, polycarbonate, plexiglass and so on.
Thermosetting plastics: The characteristics of this type of plastics are that they can be cured at a certain temperature and after a certain period of heating or the addition of a curing agent. The cured plastic has a hard texture and cannot be dissolved in a solvent, nor can it be softened by heating. If the temperature is too high, it will decompose. Its typical varieties are phenolic resin, epoxy resin, unsaturated polyester and so on.
In terms of materials, there are plastic protective covers from low-density polyethylene injection molding, vinyl dipped protective covers, high temperature resistant vinyl protective covers, EPDM rubber covers, and silicone covers. Depending on specific needs, there are many plastic caps. They have different uses.