Nowadays, polyethylene water storage tanks are trending. Due to its popularity and availability, most manufacturers are focussing on the manufacture of this type. The main elements used to manufacture polyethylene water tanks are water tank molds, polyethylene powder and gas fired ovens. It was discovered many years ago but reached its potential only after the commercialization of its production.

The basic raw material used to roto mold water tanks is Linear Low-Density Polyethylene(LLDPE). LLDPE has a high degree of short and long chain branching which gives molten LDPE its desirable flow properties. It is most suitable for manufacturing of water tanks. This process is known as free radical polymerization.

Rotomolding is one of the most popular plastic molding techniques. In this process, a measured quantity of powdered polyethylene resin is placed into the mold of the tank. The powder is then compounded and mixed to include the desired color. Additionally, UV stabilizer is added to make sure that the color does not fade away when exposed to sun rays and a release agent to remove the tank from the mold is also included. The oven needs to be preheated before the mold is placed there. After placing it in the oven, the mold is rotated bi-axially in order to coat the inside of the mold evenly. Be careful with the time spent in the oven. The tank should neither be overcooked or undercooked. Both the situation will lead to defects and imperfections in the tank. The entire manufacturing process is computer controlled. After removing the mold from the oven, it has to be cooled properly. The cooling process allows the polyethylene to set and to shrink slightly in order to remove the tank from the mold. This is the most critical step in ensuring a perfect tank. After the mold has cooled enough, remove the tank. And you are ready to repeat the process to make another one.

Most tank manufacturers try to make as many water tanks as possible without changing the mold. Changing the mold every time will add a lot to the cost of production. This is the newest technology in the manufacture of polyethylene water tanks. This makes the tank stronger, durable and completely safe for human consumption. Water stored in these LLDPE water tanks can be used for different household and commercial purposes without a worry.