As mentioned before, interval injection moulding is one of the multi-injection moulding techniques. Multi-injection moulding techniques are also known as twin-show injection moulding. The traditional process remains the same, but with techniques such as interval injection moulding we can offer our clients more creative options for their finished products.
Sandwich injection moulding
This technique is similar to interval injection moulding, it too involves a superficial element. The process also has an interval unit for the necessary pauses in between the injections. So, what’s the difference? This technology uses two injection units. These units are connected to nozzles but it gives the possibility to inject two different materials into the mould. While with interval injection moulding we can ‘only’ inject the same material but in different colours.
Over injection moulding
During the overmoulding process, we start by forming the base layer (around an insert, if need be). Next, we inject the extra plastic layer (or layers) over and around the component. Depending on the compatibility of the material, you can use one or more synthetic resins to create a specific texture or a certain look. This is a multi-material manufacturing technique Rompa Group has a lot of experience with. It is a manufacturing process we have dedicated a special blog article to, where we go into detail regarding this process. Make sure to read it here
Core-back injection moulding
If our clients want simple yet beautiful geometries in their design then the core-back process is very suitable. It might be the simplest multi-material injection moulding process and it is suitable for injection moulding with a single cavity. Note that in addition to the single cavity it also allows the cavity for displacement, this means that it can expand by using a sealing slide for injection of a second component.