Views: 0 Author: Site Editor Publish Time: 2025-04-21 Origin: Site
High-clarity injection molds are specialized tools designed to produce plastic parts with >90% light transmittance and <1% haze. These molds are critical for industries where optical performance is non-negotiable:
Optics: Camera lenses, LED light guides.
Electronics: Touch panels, display components.
Medical: Transparent labware, surgical devices.
Steel Grades:
S136H (Mirror-polishable, corrosion-resistant).
NAK80 (Pre-hardened, excellent for glossy finishes).
Plastic Resins:
PMMA (Acrylic), PC (Polycarbonate), or COP/COC (Ultra-clear cyclic olefins).
Mirror Polishing: Achieves surface roughness ≤0.005μm (Ra).
Coating: Optional Ni-P plating or DLC coating for durability.
Hot Runner Systems: Minimize material waste and flow marks.
Conformal Cooling: Ensures uniform cooling to prevent warping.
Micro-Venting: Precision vents (0.01–0.03mm deep) to eliminate air traps.
Cleanroom Environment: Prevents dust contamination.
Slow Injection Speed: Reduces internal stress and flow lines.
| Feature | High-Clarity Mold | Standard Mold |
|---|---|---|
| Surface Finish | Mirror polish (Ra ≤0.005μm) | Standard polish (Ra 0.1–0.4μm) |
| Material | S136H, NAK80 | P20, 718 |
| Cooling System | Conformal channels | Straight drilled channels |
| Cost | 3–5× higher | Lower |
Haze/Cloudiness → Cause: Poor polishing or moist resin.
Fix: Re-polish mold; pre-dry resin (120°C/4h).
Bubbles → Cause: Inadequate venting.
Fix: Add micro-vents; optimize injection speed.
Scratches → Cause: Ejection marks.
Fix: Use soft-tip ejectors; apply DLC coating.
Smartphone Light Guides (e.g., iPhone COP lenses).
Medical IV Drip Chambers (Crystal-clear, bubble-free).
High-clarity injection molds are engineering marvels that blend ultra-precision machining, advanced materials, and strict process control. While costly, they enable products where transparency equals performance.
