2 component injection moulding
aesthetic parts

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2 component injection moulding

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2K injection molding for aesthetic parts

what is the use ?

Plastic bi-injection moulding (2K injection moulding) is a manufacturing technique that creates plastic parts using two different materials. It is widely used in industry to produce everyday items such as tool handles, toys, household appliances and clothes pegs. 

USE OF2K injection molding

Aesthetic functions

Bi-material injection moulding can be used to create parts with a sublimated appearance, combining several colours or covered with a transparent material for added shine or depth.

Waterproofing & Dustproofing

The production of components incorporating seals reduces assembly costs and guarantees exceptional resistance to dust and liquids. The electrical industry, for example, regularly uses bi-material injection moulding to produce IP44 or IP65 socket blocks and switches. 

Technical functions

Combining a supple material with a rigid one offers the best of both worlds when it comes to touch, grip, shock absorption or vibration damping.

How 2K injection moulding works ?

The bi-material injection mould (or bi-injection mould) functions in the same basic way as a single-material injection mould, with the same injection, cooling and ejection functions. 

The main difference is that it is divided into 2 stations, each dedicated to a particular material 

Depending on the product to manufacture and the injection moulding machine, several types of 2K injection moulds are possible : 

  • 2K rotary mould 
  • 2K index plate mould 
  • 2K transfer mould 
  • Core back mould 

2K component Design rules

The design of a bi-material plastic part largely follows the same rules as a standard plastic product. 
However, mould technology must be mastered in order to define the areas where the second material (overmoulding) can or cannot be used. In fact, not all processes allow (easily) the presence of the second material on both sides of the part (mainly rotary moulds), or require process-specific adjustments to the shape. 

Materials can be bonded together chemically or mechanically. It all depends on the nature of the materials. For an initial indication, we invite you to take a look at our 2K material compatibility chart

Bi material injection mouldingbenefits

  1. bi material injection moulding allows to combine advantages of both materials into a unique component (hard + soft / different colors / different materials....). 
  2. Economically, bi-injection reduces the number of manufacturing stages and therefore the unit cost of a product. 
  3. Allows the use of recycled material (hidden under a virgin material for example) 
  4. Reduced carbon footprint compared to production of 2 seperate parts assembled together