Injection of different materials or colours
Bi-Injection Molding is the injection of two different colors of the same material or two different thermoplastic materials, at separate injection locations, with independent process controls, for the production of a plastic part.
As is the case in traditional injection moulding, bi-injection moulding uses materials that are at their melting point, so that the viscous material can fill the cavities of a mould.
In general, advantages of bi-injection include creating a single-structure part with different regional materials and also creating a single part with multiple independent polymer colors.
- The two materials are melted at their viscosity temperature.
- The melted materials are injected, at separate injection locations, with independent process controls.
- When the mold closes, both unites start filling the cavities.
- Can incorporate 2 different colors or join different materials like rubber and plastic.
- Reduces the production phases, optimizing time and energy cost.
- Complex geometry of the molded parts.
- Big tonnage machine is required.
- Tooling is more complex and more expensive.
- Long cycle time.
Examples of applications
Applications range from simple household items like a toothbrush to construction of items like power tools. More and more applications are met in the automotive industry as well.
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