Key Technical Specifications for High-Performance Bottle Cap Molds

High-Density, Multi-Cavity Configuration

For high-volume production requirements—such as those for 5-gallon cap mold or beverage bottle caps—molds featuring 32, 48, 72, or 96 cavities have become the industry standard. While a multi-cavity design significantly lowers the cost per unit, it demands a mold base machined to a precision of ±0.01mm to ensure molding consistency across every single cavity. Specialty Steel Application Strategy
Core/Cavity: Utilizes S136 stainless steel (HRC 50–54), balancing the requirements for corrosion resistance and mirror-finish polishing.
Key Moving Components: Selects pre-hardened H13 steel (HRC 54–56) to withstand high-frequency frictional wear.
Precision Hot Runner System
Configured with a valve-gated hot runner system to achieve:
 Zero gate waste generation
 Gate surface flatness ≤ 0.05 mm
 Temperature control accuracy of ±1°C
 Melt flow balance coefficient ≥ 95%
High-Efficiency Cooling System
Incorporates beryllium copper inserts in the core and threaded regions to achieve:
Thermal conductivity ≥ 105 W/m·K (4 times higher than standard steel)
15–20% reduction in molding cycle time for the 5-gallon cap mold
Temperature differential control ≤ 3°C (between mold cavities)