Dual-color mold and single-color mold are two different injection molding methods, according to different products to decide which way to use, we will analyze and compare the dual-color plastic mold and single-color injection mold from the following six points, so that customers can make the corresponding choice.
I. Differences in core technology principles
Dual-color mold: refers to the injection of two different colors or materials of plastic in the same mold in sequence or synchronization
Rotating disc system: dynamic mold 180° rotation switch station (such as car dashboard molding)
Dual nozzle technology: independent control of two materials injection (supports gradient/layering effect)
Precision positioning structure: secondary injection positioning error ≤±0.02mm
Technical characteristics of monochrome die
Single color mold adopts single cavity single injection molding, typical structure includes:
Two plate mold: basic structure (suitable for simple daily necessities)
Three plate mold: increase the flow plate to achieve automatic demolding (electronic components commonly used)
Hot runner design: reduce waste, improve efficiency (precision parts preferred)
Second, cost and efficiency comparison
Indicators
Two color mold
Single color mold
Key differences
Cost of development
High (3-5 times monochrome)
Low (50,000-200,000)
Structural complexity determines the cost
Cost per unit
5 to 15 yuan
One to five yuan
Material/process superposition effect
Cycle of molding
30-60 seconds
10-20 seconds
Two injections increase the time consumption
Material utilization rate
95% +
85% - 90%
No post-treatment material loss
Cost balance point: when the order quantity is more than 3000 pieces, the comprehensive cost of dual-color mold is lower than that of single-color + post-processing
Iii. Analysis of core application scenarios
Two-color mold advantage field
Consumer electronics: mobile phone frame (structural layer + decorative layer), smart watch strap (skin friendly + wear-resistant)
Auto parts: instrument panel (transparent layer + wear-resistant layer), steering wheel (anti-skid + support structure)
Medical equipment: surgical knife handle (antibacterial layer + shock absorption layer)
Single color mold core market
Standardized products: packaging containers (cosmetic packaging materials), daily necessities, small household appliances, precision medical molds, etc
Simple structural parts: industrial gears, bearings, connectors (accuracy requirements ≤0.1mm)
4. Comparison of selection decisions and cases
Decision Model (flowchart)
Product Requirements → Is it multi-color/multi-material?
├─ Yes → Batch > 3000 pieces? → is → Two-color mold; No → Monochrome + post-processing
└ -- No → Monochrome mold (hot runner design is preferred)
V. Industry trends and quality control
Technology development direction
Two-color mold: multi-material composite (metal-plastic inserts), intelligent mold (sensor integration)
Monochrome mold: 3D printing cooling water circuit (efficiency increase by 40%), ultra-precision machining (accuracy ±0.001mm)
Quality control points
Two-color mold: injection pressure 80-120MPa, mold temperature 40-60℃ (front mold)
Single color mold: three coordinate detection size (accuracy ±0.005mm), surface roughness Ra≤0.8μm
Conclusion:
Dual-color mold has significant advantages in function integration and complex structure, suitable for medium and high batch, multi-material products; Monochromatic molds maintain cost advantages in standardized production. Enterprises need to combine product characteristics (color/material requirements), order size and accuracy requirements for comprehensive selection. With the development of material technology and intelligence, the application scenario of two-color molds will continue to expand, while the single-color mold will consolidate the basic market position through precision and energy-saving transformation.
