Product Definition
Jar Cap Injection Molding Machine is a high-precision, high-cycle thermoplastic injection system engineered for continuous production of threaded jar closures used in food, beverage, cosmetic, and pharmaceutical packaging lines.
Cap Quality Control Mechanism
This system ensures dimensional consistency through:
- Mold steel precision: S136 / 2316 corrosion-resistant tooling
- Critical tolerance control: ±0.02–0.05 mm (thread and sealing surface)
- Injection pressure balance algorithm across cavities
- Thermal stabilization before demolding
Industrial Integration Capability
This machine is designed to integrate into full packaging lines:
- Injection molding → automatic cap take-out
- Cooling conveyor system
- Visual defect inspection (flash / short shot / deformation)
- Automatic counting & packing system
- Optional: inline weighing quality control
Custom Engineering Options
- 8–48 cavity mold compatibility
- Servo hydraulic injection system (energy saving 30–60%)
- High-speed ejector robot integration
- Fully automatic cap sorting & packing line
- Material-specific screw design (PP / HDPE / recycled resin optimization)
Manufacturing Quality Assurance
Each machine is validated through:
- CNC machining tolerance control: ±0.01–0.02 mm critical surfaces
- Hydraulic system pressure leakage test
- 24-hour continuous dry-cycle stability testing
- Mold trial verification (T0/T1 simulation run)
- Electrical system compliance (CE export standard optional)
Packaging & Global Delivery Standard
Anti-corrosion treatment for hydraulic and mold-contact zones
Vacuum protection for precision components
Reinforced export-grade wooden crate or steel frame fixation
Modular disassembly for container optimization
Delivery time: 30–65 days (depending on cavity + automation level)
Main Parameters
| Screw diameter | mm | 35 | 40 | 45 |
| Screw L/D ratio | L/D | 24.5 | 21 | 18.7 |
| Shot weight | gram | 158 | 206 | 260 |
| Injection capacity | cm3 | 173 | 226 | 286 |
| Injection pressure | Mpa | 235 | 180 | 142 |
| Theoretical injection rate | g/s | 110 | 143 | 181 |
| Plastic capacity | g/s | 13.8 | 19.7 | 27.1 |
| Injection stoke | mm | 180 | ||
| Screw torque | N.m | 740 | ||
| Max screw rotate speed | r/min | 250 | ||
| Clamping force | Ton | 130 | ||
| Opening stroke | mm | 400 | ||
| Space between tie bars | mm | 420x420 | ||
| Mould height | mm | 160~440 | ||
| Max daylight | mm | 840 | ||
| Ejector force | ton | 3.14 | ||
| Ejector stroke | mm | 100 | ||
| Ejector quantity | 5 | |||
| Oil pump motor | kw | 15 | ||
| Pump pressure | Mpa | 10 | ||
| Heating power | kw | 9.2 | ||
| Machine size | M | 4.7*125*1.85 | ||
| Machine weight | ton | 4.3 | ||
| Oil tank capacity | L | 360 | ||
| International designation | 1300-410 | |||
The main parts
Certification
FAQ
Q: What determines output capacity most in jar cap production?
A: Cavity count is primary, but cycle stability and cooling efficiency directly affect actual hourly output.
Q: What is the most common configuration for beverage factories?
A: 24–48 cavity molds with servo hydraulic systems for stable high-speed production.
Q: Can recycled PP/HDPE be used?
A: Yes, but requires filtration system and stable drying to maintain surface quality and thread precision.
Q: What is the typical mold life?
A: P20: ~300,000 cycles
718H: ~500,000–700,000 cycles
S136/H13: 800,000–1,000,000+ cycles
Q: How is thread accuracy controlled?
A: Through cavity machining precision + stable clamping alignment + balanced injection pressure distribution.
Q: Can this machine produce tamper-evident caps?
A: Yes, with dedicated mold structure including break ring and anti-theft sealing geometry.
Q: Is hot runner necessary?
A: For 24+ cavity molds, hot runner is strongly recommended to ensure flow balance and reduce material waste.
Q: What is the main cause of cap defects?
A: Unbalanced cavity filling, poor cooling design, or unstable injection pressure profile.
Q: Can it integrate with automatic packaging lines?
A: Yes, full integration including sorting, counting, inspection, and bagging is supported.
Q: What industries use this system most?
A: Beverage bottling plants, food packaging factories, cosmetic packaging manufacturers, and pharmaceutical container producers.
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