Multi-shot and Double-shot Plastic Injection Moulding
- Our Experience in multi-shot and double-shot moulding
- Why Choose Kore?
- What is Multi Shots Moulding?
- What is Double-shot Injection Moulding?
- Benefits of multi-shot moulding
- Areas it is best applied
- Case Studies
Multi-shot Moulding & Double-shot Moulding Examples
Why Choose Kore
- We advocate multi-shot moulding for its benefits – one of which is actually green manufacturing.
- One of our core competencies is 2K, and 3K moulding technologies.
Want to know more? Do talk to us today about how 2K or 3K technologies could help you with your products.
Find out more about multi-shot moulding and double-shot moulding below.
What is Multi-shot Moulding?
Multi-shot moulding is the injection moulding process that moulds two or more more materials onto each other in a single injection moulding cycle.
Unsurprisingly, the most common type of multi-shot moulding is the double-shot moulding.
What is Double-shot Injection Moulding?
In short, two shot injection is the injection moulding process that moulds two materials onto each other in a single injection moulding cycle.
Other terms for double-shot injection moulding are:
- Twin-shot injection moulding
- 2K injection moulding
- 2-shot or Two-shot injection moulding
- Double-colour injection moulding
- Transfer moulding
How it is done
First, the substrate is injected into the its respective mould cavity, while the over-mould is injected into its own cavity over the substrate from the first half of the injection moulding cycle.
Next, the mould opens and the moving half or the core side of the mould is rotated 180 degrees and closed for the second half of the injection moulding cycle.
Finally, the finished two-shot part is finally ejected from the mould for manual or robot pick.
For a double-shot plastic injection moulding to work, the substrate and over-mould plastic material has to be chemically compatible in order to form a solid bond.
Alternatively, in cases where the substrate and over-mould plastic material are not chemically compatible, the substrate geometry has to incorporate mechanical bonding features such as through holes or other similar features.
These features allow the overmolded plastic material to mechanically “grab” onto the chemically incompatible substrate.
Read more about our past case studies of different types of double-shot / multi-shot moulds here
Benefits of Multi-shot Injection Moulding
- Multi-shot moulding method significantly improves the appearance and appeal of the product
- As such technology is a combined single moulding process that join two parts, it reduces the process costs by eliminating manual assembly or adhesive.
- Moreover, this process also provides a stronger and more durable product; as opposed to an assembled product manufactured using two individual moulded components
- Also, an added benefit is its ability to provide beautiful multi-colored product. This eliminates the need for secondary process such as painting or plating.
- On top of that, two-shot moulding produces complex parts that are capable of extra functions.
- Interestingly, such products are much more functionally robust widely used in dust, shock, and waterproofing applications; e.g. IP68 housings
It is important to note that such method is ideal for surfaces with maximum friction, i.e. first shot hard plastics with a second shot soft rubber designed to enhance grip non-slip surfaces for industrial hand-held devices and infant products.
In What Areas is Double-shot Moulding Best Applied?
The two shot injection mould are ideal for
- buttons and switches, handles, grips and caps.
- multicolored products or painted logos.
- parts that function as noise pads and vibration damper.
- aerospace, automotive, medical and consumer industries
In conclusion, this process is truly widely used and trusted for its versatility and durability.
Read about our multi-shot moulding case studies here