BI-INJECTION MOLDING – 2K MOLDING
Bi-injection molding, or 2k injection molding, is a plastic injection process allowing the production of a part made of two materials with different characteristics using a single press and a single tool. Examples of its use include parts requiring two colors or two different hardness levels. As a specialist in plastic injection molding, we’ve developed advanced know-how in dual injection molding of plastic materials.To get more news about https://www.asm-mold.com/2k-multi-shot/ 2k injection molding, you can visit asm-mold.com official website.
This solution can be advantageous (in time and cost terms) while also satisfying very precise constraints. Bi-material injection molding involves a certain technicality and requires good mastery of tool design, materials selection and the injection phase itself. For this reason, we can support you upstream of your project to guarantee that it remains feasible and viable.
Our injection workshop is equipped with automated presses and is suitable for this type of process (up to 480 tones). Molds used for bi-injection are also manufactured in our in-house mechanical workshop.Other applications are also possible, depending on the type of part and the specifications of your product. Bi-injection molding also allows the production of transparent parts comprising an opaque zone (colored or not) to create colorful graphics and elegant finishes that enhance product functionality and added value. It’s possible to create rigid zones with flexible zones: hinge effect, shock-absorbing zones, push buttons, etc.
In general, all thermoplastic polymers, from the simplest to the most technical, are compatible with the bi-injection process. In the case of flexible materials, the over-molded material is generally SEBS/TPE (Styrene-ethylene-butylene-styrene) or TPU (thermoplastic polyurethane) with different Shore hardnesses and possible textures. Most often, the two assembled components are different but similar and show good chemical compatibility.
Whether or not to use bi-material injection depends on various inherent constraints of your project and a preliminary study to validate your selection is generally required. Bi-injection is often used for large-volume production, complex geometries or in cases where over-molding is not suitable. Below we present some of the advantages and disadvantages of this process compared to mono-injection or over-molding:
