Loading moulds with powder and inserts is the first step of the rotomoulding process. A measured amount of powder plastic material is placed into a mould, along with any desired metal inserts or reinforcements that need to embed into the part. The exact part weight in plastic powder is inserted into the mould. Once filled with powder, the mould is closed and heated in a rotational oven, where the plastic material melts and conforms to the shape of the mould. This process is continued until the desired thickness of the plastic part is achieved.
Methods for placing powder
There are various methods for placing powder into the mould in rotomoulding. One method is to manually add a pre-weighed amount of powder from a bin or bag. Another method is using an automated loading system that uses a flexible pipe or hopper to convey a specific amount of powder from the powder storage to the mould. This ensures that the right amount of powder of the correct resin and colour is used in the moulding process.
Inserts add functionality
Metal threads or reinforcements can be incorporated into the moulding process to enhance the performance of the final plastic part. These inserts can be placed in the mould before the plastic powder is added and then become embedded in the plastic during the moulding process. This allows for the integration of additional features such as mounting points, hose connections or filler necks. This can reduce the need for additional post-moulding assembly work or other additional operations. This technique can be used in a variety of applications. It is important to note that the design of the insert and the mould must be carefully considered to ensure proper alignment and to avoid any issues during the moulding process.