- By Admin
- 2026/3/24
High-Efficiency Large Diameter PET Preform Molds: High Cavitation with Precision Thread and Seal Ring Accuracy
ZSM Machinery: Professional Manufacturer of Bottle Caps, PET Preforms, and Blow Molding Machines
ZSM Machinery is a leading manufacturer and supplier of high-performance plastic packaging solutions for the global industry. Specializing in bottle cap production equipment, PET preform injection molding systems, and advanced blow molding machinery, we provide comprehensive, integrated solutions for manufacturers worldwide. With years of technical expertise and a strong commitment to research and development, we offer state-of-the-art equipment and tooling that enables customers to produce high-quality plastic packaging components efficiently and cost-effectively.
High-Efficiency Large Diameter PET Preform Molds: High Cavitation with Precision Thread and Seal Ring Accuracy
ZSM Machinery proudly presents our High-Efficiency Large Diameter PET Preform Molds—precision-engineered tooling solutions designed for the high-volume production of wide-mouth preforms. Large diameter preforms, typically ranging from 38mm to 120mm neck finishes, are essential for food jars, bulk containers, and specialty packaging . Our molds achieve exceptional productivity through high cavitation configurations while maintaining the critical precision required for thread profiles and sealing surfaces.
Key Features
1. High Cavitation for Large Diameter Preforms
Despite the larger size, our molds deliver exceptional productivity:
| Cavity Count | Typical Output | Ideal Application |
|---|---|---|
| 16-24 cavities | 6,000-12,000/hour | Medium-volume wide-mouth production |
| 24-32 cavities | 10,000-18,000/hour | High-volume food jar manufacturing |
| 32-48 cavities | 15,000-25,000/hour | Large-scale bulk container operations |
2. Precision Thread Engineering
The screw thread is critical for proper sealing and closure performance:
High-precision thread-forming inserts manufactured to micron-level accuracy
Consistent thread profiles across all cavities ensuring uniform sealing performance
Tight dimensional control maintaining thread tolerance within ±0.02mm
Clean thread definition with no flash or deformation, even at high cavitation
3. Superior Seal Ring Accuracy
The sealing ring or liner seat is equally critical for leak-proof performance:
Precision-machined sealing surfaces with surface finish accuracy of Ra 0.8 or better
Consistent sealing geometry across all cavities ensuring uniform closure compression
Optimized cooling in seal ring area preventing warpage and dimensional variation
Seal surface concentricity maintained within tight tolerances
4. Advanced Hot Runner System
Our large diameter preform molds feature state-of-the-art valve gate hot runner technology:
| Feature | Specification |
|---|---|
| Nozzle Temperature Control | ±1°C accuracy |
| Weight Variation Between Cavities | < 0.5 grams |
| Gate Type | Valve gate (needle valve) |
| Balanced Filling | Uniform across all cavities |
5. Premium Material Construction
| Component | Material | Hardness |
|---|---|---|
| Core and Cavity Inserts | S136 Stainless Steel (Sweden) | HRC 48-52 |
| Neck Rings (Thread/Seal) | Imported Nitrided Steel | HRC 45+ |
| Seal Ring Forming Inserts | Premium Tool Steel | HRC 50-55 |
| Mold Base | Chrome-plated P20 Steel | Pre-hardened |
Mold life: Engineered for 3-5+ million injection cycles with proper maintenance
6. Optimized Cooling System
Efficient cooling is critical for maintaining thread and seal ring accuracy at high cavitation:
Spiral cooling channels in cavity inserts for rapid, uniform heat extraction
Enhanced cooling in neck region where thread and seal ring are formed
Individual cooling circuit control for balanced temperature distribution
Cycle times optimized for large diameter preform production
7. Advanced Dipole Taper Localization
Our proprietary self-locking cavity design ensures:
Each cavity self-clamps independently for perfect concentricity
Reduced thread and seal ring variation through individual cavity alignment
Extended mold life through balanced force distribution
Consistent quality across all cavities
Technical Specifications
| Parameter | Specification |
|---|---|
| Neck Finishes | 38mm, 48mm, 63mm, 70mm, 89mm, 100mm, 120mm, custom |
| Preform Weight Range | 25g - 150g typical |
| Thread Tolerance | ±0.02mm |
| Seal Ring Surface Finish | Ra 0.8 or better |
| Wall Thickness Variation | < 0.12mm |
| Weight Difference Between Cavities | < 0.5 grams |
| Cycle Time | 20-35 seconds (depending on weight) |
| Gate Type | Valve gate hot runner |
| Mold Life | 3-5+ million shots |
Applications
Food Packaging
Jam, honey, and preserve jars
Sauce and condiment containers
Pickle and olive jars
Dry food storage containers
Edible Oil Industry
Bulk cooking oil containers
Olive oil and specialty oil bottles
Household Products
Detergent and cleaning solution containers
Bulk chemical packaging
Cosmetics and Personal Care
Cream and lotion jars
Body butter and scrub containers
Quality Assurance
Every ZSM large diameter preform mold undergoes rigorous testing:
CMM inspection verifying thread and seal ring dimensions
Surface finish testing confirming seal ring accuracy
Weight consistency verification across all cavities
Thread gauge testing ensuring closure compatibility
Sample production available for customer approval
Why Choose ZSM for Large Diameter Preform Molds?
High cavitation capability: 32-48 cavity configurations for large diameter preforms
Precision thread engineering: ±0.02mm tolerance for reliable closure compatibility
Superior seal ring accuracy: Ra 0.8 surface finish for leak-proof performance
Premium materials: S136 steel construction for extended mold life
Advanced cooling: Optimized systems maintaining dimensional stability
Integrated solutions: Seamless compatibility with our preform machines and blow molding equipment
Partner with ZSM for High-Efficiency Large Diameter Preform Solutions
ZSM Machinery's High-Efficiency Large Diameter PET Preform Molds deliver exceptional productivity with uncompromising precision in thread and seal ring accuracy. Contact us today to discuss your requirements.