Today I find an interested video in youtube published by FCS Machinery to demonstrate the two tone injection production of 680ml airtight container by their new All-Electric two-component injection molding machine CT-230R which was designed for the production of two-component and multi-component products, including electronic parts, medical appliance, cosmetic containers, etc.

Although it's a 230Ton machine, but as a two-component injection molding machine its size will usually much larger than the standard servo injection molding machine, the robot to recommend here is SW6710DS-20 which is a 3 axis servo injection robot with a payload up to 6kg. Stable and efficient as it's, for sure will help you greatly in your production.