2K molds (also called two-shot molds or two-component molds) enable injection of two different plastics, elastomers or colors in a single molding cycle. Our bi-injection mold tooling integrates decoiling, precise core/cavity matching, 180° rotation and advanced cooling to produce complex, overmolded parts without secondary assembly.
Key Features
• Dual Cavities & Cores – Separate female cavities for each material; identical male cores for consistent part geometry in both shots.
• Central 180° Rotation – Automatic platen rotation aligns core A to cavity B; tolerance-controlled guide pins (±0.01 mm) ensure seamless overmolding.
• Nozzle-Free Automated Demolding – Self-releasing sprue nozzles cut cycle time by 20% and reduce post-mold trimming.
• One-Point Down-Pressure System – Rapid, accurate flat-point adjustment replaces traditional four-point leveling for faster setup.
• Hardened Rollers & Heat-Treated Steel – High-precision bearing-grade steel components resist wear, maintain alignment and deliver thousands of runs.
Technical Specifications
• Front/A-Board Thickness: ≥170 mm to withstand injection pressures of 100–150 MPa
• Coil Handling: Inner diameter 450–530 mm; outer diameter up to 1,200 mm; hydraulic expansion available
• Ejector KO Holes: Standard 200 × 200 mm spacing; customizable to mold base size
• Cooling System: Balanced channels, 10+ L/min flow, ΔT ≤3 °C; conformal and baffle cooling options reduce cycle by up to 20%
• Rotation Interlock: Proximity sensors with ≤0.3 s response prevent platen closure until sliders/lifters are retracted
• Material Sequence: Hard plastics first (PC, POM at 280–300 °C), then soft elastomers (TPE, silicone at 180–200 °C)
Mold Design Guidelines
• Dimensional Compensation – Oversize first-shot features by 0.1–0.3 mm and apply precision core pressing during second shot for hermetic sealing.
• Flow-Dynamics Control – Integrate deflector ribs and optimized injection ramps (50% to 100% speed over 0.5 s) to protect overmold interfaces.
• Finite-Element Analysis – Validate seal strength under ≥80 MPa; check for plastic deformation and crack propagation in second-shot zones.
Typical Applications
• Automotive Components: Two-color trim, seals integrated into housings, multi-durometer gaskets.
• Medical Devices: Overmolded grips, seals and snap-fits for surgical handles and diagnostics cartridges.
• Consumer Electronics: Waterproof smartphone buttons, connectors and ergonomic grips.
• Household Appliances: Two-tone control knobs, soft-touch accents and integrated gaskets.
Why Choose Our 2K Mold Tooling?
• Proven Expertise – Decades of mold design and multi-shot production experience.
• Fast Turnkey Delivery – From concept and flow simulation through trial runs and production validation.
• Competitive Cost – Optimized layout and modular inserts reduce tooling investment.
• Rigorous Quality Control – CMM inspection reports, pilot-run sampling and on-site support.
• Continuous Innovation – Custom rotation mechanisms, advanced hot-runner systems and automated demolding.
Conclusion
Our 2K molds combine precision core/cavity matching, reliable rotation, advanced demolding nozzles and optimized cooling to deliver high-quality, multi-material parts in a single cycle. Choose us for innovative, cost-effective two-shot mold solutions tailored to your most demanding applications.
