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120mm Wide Mouth Jar Cap Mould
SINO Mould specializes in custom precision injection moulds for 120mm wide-mouth jar caps, designed for plastic screw lids matching large-capacity storage jars, food sealed containers and cosmetic cream buckets. Different from standard small-diameter cap moulds, we carry out special mold flow optimization for 120mm large-diameter lid thread, sealing surface and anti-slip texture. Equipped with hot runner multi-cavity high-speed molding solution, it features short cycle time, complete thread without short shot and flash-free parting line. This mould is compatible with food-grade PP/HDPE material, customizable with 4/8/12/16 cavities. Adopting automatic rotary thread demoulding structure without manual unscrewing, it perfectly meets mass production demands of large snack cans, milk powder cans and chemical buckets, effectively cutting down unit production cost for manufacturers.
120mm Wide Mouth Jar Cap Mould Details
Below are examples of the most common parameters for 120mm wide mouth cap moulds.
| 120mm Cap Mould Cavity Steel | S136 / 718H / M303 | Recommended Injection Machine | DKM DFS High Speed Injection Moulding Machine |
|---|---|---|---|
| 120mm Cap Mould Core Steel | S136 / 718H / M303 | Plastic Material | Food-grade PP / HDPE |
| Mould Base Standard / Steel | P20 Pre-hardened Stainless Steel | Ejection System | Stripper |
| Sliders, Inserts, Lifters Steel | High-strength tool steel with surface hardening treatment | Injection Process | High-speed injection, short cycle time, precise temperature control |
| Number of Cavities | 2-16 cavities | Injection Cycle Time | 10-15 seconds |
| Hot Runner System | Fully hot runner system | Mould Manufacturing Lead Time | 40–65 days |
Key Quality Points of 120mm Wide Mouth Cap Moulds
Special rotary thread demoulding mechanism for large diameter: Complete demoulding of 120mm wide thread without wire drawing or broken teeth, smooth opening & closing with leak-proof sealing.
Good cooling design: Strengthened cooling for lid edge and thread area with uniform temperature difference to avoid cap warpage.
Balanced independent hot runner system: Consistent temperature & pressure for each cavity, weight difference ≤0.03g among multi-cavity products with uniform batch dimension.
- S136 mirror anti-rust steel for cavity: Food-grade mirror polishing, scratch-free finished caps without secondary trimming, anti-rust during long-term production.
- Modular insert design: Thread ring and sealing rib inserts can be disassembled & replaced separately, lower maintenance & modification cost with short downtime.
- Full-process CAE mold flow analysis: Predict shrinkage, air trap and short shot in advance to reach standard after one mould test & shorten delivery cycle;
- Customization available: Logo engraving, anti-slip grain redesign, double sealing structure, tamper-evident tear strip cap customization.
SINO Mould One-stop Service
With over ten years of experience in packaging cap moulds, SINO Mould has successfully delivered a full range of 60–120mm wide-mouth cap moulds, equipped with complete supporting capacity for design, processing, mould testing and mass production.
- Pre-production Solution: Free 3D modeling & mold flow analysis, match optimal cavity and runner plan based on customer injection machine tonnage and daily output;
- Precision Processing: 5-axis CNC, EDM mirror spark processing and heat treatment hardening, all core parts interchangeable;
- Pre-delivery Test: Multiple machine tests with dimension inspection & sealing test reports, delivery only after yield rate meets standard;
- After-sales Support: On-site installation & commissioning guidance, full mould maintenance manual, free repair for non-artificial damage within warranty period;
- Iteration Upgrade: Support old mould modification, cap style redesign, cavity expansion, sealing structure upgrade and other post-delivery optimization services.
Mould Flow Analysis for 120mm Wide Mouth Cap Moulds
Using Mouldflow analysis, we optimize the filling, packing, and cooling processes of the 120mm cap mould. The analysis simulates the injection moulding process, optimizing cavity layout, gate positions, and temperature control solutions, ensuring uniform cavity filling and reducing air pockets, warping, and short shots, enhancing the moulding stability of the 120mm cap mould.
