Plastic products are generally formed using three processes: rotational molding, injection molding and blow molding.
Today, we mainly introduce the rotational molding process, which is also a common production process used to make common plastic products such as Plastic water towers, dosing boxes, square boxes and drums.
Rotational molding is a thermoplastic hollow molding method.
The main process can be disassembled in four steps: feeding, heating, cooling, and demoulding.
First add the plastic raw material into the prepared mold, inject the powder or paste material into the mold, through the heating of the mold and the double-axis rolling rotation, and then the mold is continuously rotated along the two vertical axes and heated, and the plastic in the mold is heated. Under the action of gravity and thermal energy, the raw materials evenly fill the cavity of the mold and melt by their own gravity, gradually and evenly coat, melt and adhere to the entire surface of the cavity, and form into the desired shape, and then The hollow product is obtained by demoulding after cooling.
In the whole production process, the speed of mold rotation, heating and cooling time are all strictly controlled.
The rotational speed is not high during the production process of the rotomolding mold, the product has almost no internal stress, and it is not easy to deform and dent. At first, it was mainly used in the production of PVC paste plastics, balls, bottles and cans and other small products. Recently, it has also been widely used in large products. The resins used include polyamide, polyethylene, modified polystyrene polycarbonate, etc.
Compared with other mold processes, the rotational molding process provides us with more design space. With the right design concept, we can combine several parts into a complete mold, which greatly reduces the high assembly cost.
The rotomolding process also includes a range of inherent design thinking, such as how to reconcile the thickness of the sidewalls and how to enhance the exterior settings. If you need to add some auxiliary designs, then we can also add the reinforcement rib to the design.
In addition, the rotational molding process has another advantage over the blow molding and injection molding processes: cost.
When cost is also one of our considerations, rotational molding has a market advantage over other types of processes. When compared to blow molding and injection molding, rotational molding is more cost-effective to produce parts of different sizes with ease. His mold is also much cheaper because it doesn’t have some internal cores to make. And without the inner core, it can be made into another model with just a little change.
Because each part in the production process is finally formed under a high temperature and rotating process, unlike those formed under heavy pressure, the rotational molding mold does not require special processing like the injection molding process. Can withstand the test of stress.
Production costs for converting products are also now down, as more raw materials are often used to convert light-weight plastics into heavy-duty plastics. For the rotational molding process, a single-type prototype that saves consumption costs will be its future high-yield development trend.
Ningbo Jinghe Rotomolding Technology Co., Ltd is a professinal manufacturer for rotomolding industrial for more than 15years.We have made nearly 600sets of moulds and make 200,000pcs products to our overseas market per year. With rich experince and have made widely range of the moulds, we believe that our company can fit for difference demand for you.
Post time: Apr-23-2022