Demoulding in rotomoulding
Demoulding in rotomoulding is the process of removing the finished product from the mould, sometimes called unloading. Once the cooling stage is completed, the part is ready to be released from the mould.
This process begins with aligning the mould after the rotation phases. Inserts that are held in the mould now are released. The first mould part can now be removed, clamps are released to allow this. If the mould has multiple parts, all parts are removed until the part can be released from the base. Depending on the part of the shape, injectors or external tools are used to release the part.
To allow for controlled release from the mould surface so called release agents are used. These agents are applied as a coating to the mould to control the balance between early release or late sticking of parts. An early release of resin inside the mould can result in parts uneven cooled, or not being solidified correctly, or even deformed. And parts sticking to moulds may damage during demoulding. It is crucial to understand and control this release from the mould.
Once removed, the part needs to be cooled down to room temperature. This second cooling phase is crucial as it can affect the properties of the final product. The cooling process can be controlled by applying inner pressure in the hollow parts of the product during this final cooling stage.
Depending on the product’s specifications, it may be cooled in a specialized fixture to maintain specific tolerances or interfaces. The optimal cooling steps will be determined for each individual product to ensure the desired properties are achieved.