Technical Specifications
Neck Finish: 45mm (Standard for 5L/10L water bottles and oil containers).
Cavity Range: Typically 2, 4, 8, 16, or 24 cavities (Lower cavity counts compared to 28mm due to size).
Preform Weight: Generally ranges from 70g to 160g+.
Mould Material: Core/Cavity: High-grade stainless steel (S136 or 2316) for anti-corrosion and high-gloss finish.
Key Engineering FeaturesAdvanced Valve-Gated Hot Runner:
Advanced Valve-Gated Hot Runner: Specifically optimized for large-diameter flow. It ensures the gate is clean and centered, preventing "long tails" or crystallization at the injection point, which is crucial for the structural strength of heavy bottles.
Enhanced Cooling System: Since 45mm preforms have thicker walls, cooling is the biggest challenge. Our moulds feature internal spiral cooling channels for both the core and cavity, plus intensive cooling for the neck to ensure rapid solidification and shorter cycle times.
Precision Centering & Locking: A multi-stage self-locking system prevents core shifting under high injection pressure, ensuring wall thickness uniformity ($\leq 0.12mm$) across the large surface area.
Durability: Designed for high-pressure production, ensuring a service life of over 2 million cycles.
Production Efficiency
Cycle Time: Typically 25 to 45 seconds, optimized through superior heat dissipation designs.
Automation: Fully compatible with automatic take-out robots and post-cooling stations to prevent deformation after ejection.
The 45mm neck is the industry standard for:
Bulk Water Packaging: 5L, 8L, and 10L household water bottles.
Edible Oil Industry: Large 5L jerry cans or round oil bottles.
Home & Personal Care: Bulk detergent containers or industrial chemical packaging.
Why Partner with SZ-MOLDTECH for 45mm Solutions?
| Feature | Advantage |
| High Precision | CNC/EDM machining tolerances within ±0.005mm. |
| Optimized Weight | Helps clients reduce material costs by achieving consistent thin-wall sections in large preforms. |
| RPET Ready | Engineered to handle recycled PET, meeting global sustainability requirements. |
As a dedicated one-stop supplier, SZ-MOLDTECH excels in designing and manufacturing high-precision 38mm preform molds. Our collaboration with top-tier global material specialists ensures every mold meets the highest standards of durability and cycle-time efficiency, empowering your production line with consistent, long-term reliability.
FAQ
1. How do you prevent "Gate Crystallization" or "Long Tails" on heavy 45mm preforms?
For large-volume injection, gate temperature control is vital. We utilize an Independent Temperature Control System for each hot runner nozzle combined with Pneumatic Needle Valve Gates. This ensures a clean, flat shut-off at the injection point, eliminating "long tails" and preventing the base from becoming brittle due to over-cooling or over-heating.
2. Is the 45mm mould suitable for producing 5L-10L "One-Way" water bottles?
Absolutely. The 45mm neck is the global standard for 5L+ disposable (one-way) bottles. Our moulds are optimized for lightweighting technology, allowing you to reduce the preform weight without compromising the top-load strength of the final bottle. This helps producers significantly save on raw material costs for high-volume bulk water orders.
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