In the first stage, the primary material is injected, forming the initial part. Once this layer solidifies, the mold rotates or shifts to align with a second injection unit. The second thermoplastic, which can have distinct properties like color, flexibility, or durability, is then injected onto or around the first layer.

This process enables the creation of multi-coloured components, overmolded parts, or components with varied textures and mechanical properties, all in one cycle. The result is reduced assembly time and improved part integrity, making twin shot molding particularly advantageous in industries such as automotive, consumer goods, and medical devices. Its efficiency and versatility contribute to cost-effectiveness in high-volume production.