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Help CenterAuto-Unscrewing Plastic Injection Mold for Threaded Caps - Ideal for Beverage, Cosmetic & Pharmaceutical Packaging
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Welcome to Changzhou Hongxinyutai Precision Mold Co., Ltd. – a trusted manufacturer established in 2017 with a factory spanning 1,000–3,000 square meters and a dedicated team of 51–100 employees. We specialize in designing and producing high-performance plastic injection molds, and our Auto-Unscrewing Plastic Injection Mold for Threaded Caps represents the pinnacle of precision engineering. This mold is specifically engineered to meet the demanding requirements of the beverage, cosmetic, and pharmaceutical packaging industries, offering fast cycle times, consistent quality, and minimal scrap rates. With our TS16969 certified production processes, we deliver molds that not only enhance your production efficiency but also reduce operational costs.
Our auto-unscrewing molds are designed to automatically eject threaded caps without manual intervention, eliminating secondary operations and increasing throughput. The innovative mechanism uses either hydraulic or servo motor drives to rotate the core, ensuring smooth and precise unscrewing even for fine threads. This technology is ideal for high-volume production of caps ranging from 18mm to 60mm in diameter, with thread types such as ROPP, PCO, and custom designs. Below you will find the key technical specifications and features that set our molds apart:
| Parameter | Specification / Options |
|---|---|
| Number of Cavities | 4, 8, 16, 24, 32, 48, 72 (customizable) |
| Mold Steel Material | P20, 718H, NAK80, S136 (optional) |
| Unscrewing Drive | Hydraulic cylinder or Servo motor (customer choice) |
| Mold Base | LKM, HASCO, DME standards (or custom) |
| Cycle Time | 8–15 seconds (depending on cap size & cavities) |
| Cooling System | Conformal cooling channels for uniform temperature |
| Thread Types Supported | Continuous thread, interrupted thread, tamper-evident |
Key Features & Benefits:
- Fully Automatic Unscrewing: Eliminates need for manual removal or secondary operations, reducing labor costs and increasing production speed by up to 30%.
- High Precision & Consistency: Ground and polished cores ensure perfect thread form and tight tolerances, resulting in caps that seal consistently and reduce leakage risks.
- Multi-Cavity Capability: Available in 4 to 72 cavities, allowing high-volume output (over 100,000 caps per day for a 48-cavity mold) while maintaining uniform quality.
- Durable Construction: Made from premium tool steels with hardness >48 HRC, delivering long mold life (1–2 million shots) and resistance to wear even with abrasive fillers.
- Versatile Compatibility: Designed to fit most standard injection molding machines (e.g., Engel, Husky, Haitian, Nissei) with optional custom adapters.
- Low Maintenance: Self-lubricating bushings and sealed bearings reduce downtime; all wearing parts are easily replaceable.
- Efficient Cooling: Conformal cooling channels reduce cycle time and minimize warpage, improving part quality and dimensional stability.
Applications:
- Beverage Packaging: Carbonated drink caps, water bottle caps, juice caps – threads compatible with PCO 1810, 1881, etc.
- Cosmetic Packaging: Lotion pump caps, cream jars, nail polish bottle caps – fine threads for elegant closures.
- Pharmaceutical Packaging: Child-resistant caps, tamper-evident caps, dropper bottle caps – meeting hygiene and safety standards.
At Changzhou Hongxinyutai, we understand that every packaging project is unique. That’s why we offer complete customization: from cavity layout and cooling design to unscrewing drive type and mold base dimensions. Our experienced engineering team (with an average of 10+ years in mold design) uses advanced CAD/CAM/CAE software to simulate flow and cooling before manufacturing, ensuring first-shot success.
Why Choose Hongxinyutai?
- TS16969 Certified Quality Management System – Our processes are audited regularly to guarantee consistent quality.
- Factory Capacity: 1000–3000 sqm facility with 15+ CNC machines, 5 EDM, and 3 wire-cut machines, enabling fast turnaround (typically 30–45 days for a standard mold).
- Experienced Team: 51–100 employees including skilled mold makers, engineers, and QC inspectors.
- Global Reach: We have exported to North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East – over 20 countries.
- After-Sales Support: We provide mold commissioning, trial shots, and remote troubleshooting. Spare parts are available upon request within 48 hours.
We are confident that our auto-unscrewing mold will significantly boost your production efficiency and product quality. As a direct manufacturer, we offer competitive pricing without compromising on performance. Contact us today to discuss your specific cap requirements or request a quotation. Our team is ready to support you from design to delivery.
Frequently Asked Questions
-
Q: Can this mold handle different cap sizes?
A: Yes, the mold is designed with interchangeable inserts for different thread sizes and cap diameters. We can customize the core and cavity to match your specific cap dimensions (typically 18–60 mm). -
Q: What is the typical mold life?
A: With proper maintenance, our molds last 1 to 2 million shots. The exact lifespan depends on the material used (e.g., glass-filled PP will wear faster than unfilled PP) and production conditions. -
Q: What injection molding machine is required?
A: The mold can be adapted to most standard machines with appropriate clamping force. For example, a 48-cavity mold may require a 300–400 ton machine. We provide a detailed mounting specification upon order. -
Q: Do you provide samples for testing?
A: Yes, we can produce trial samples before mass production. Usually we run a trial at our factory and send you samples for approval. We also offer video inspection for remote customers. -
Q: What is the lead time?
A: Standard lead time is 30–45 days after design confirmation. For rush orders, we may expedite to 25–30 days at an additional cost. Please contact us for current availability. -
Q: Is the mold suitable for tamper-evident caps?
A: Absolutely. The unscrewing mechanism can be designed to accommodate tamper-evident bands. We can incorporate a special stripper ring or air blow system to eject the band along with the cap. -
Q: How do you ensure quality?
A: We follow TS16969 procedures, including IQC for incoming steel, in-process inspection of cavity dimensions, and final testing with a trial run. We also provide a CMM report for critical dimensions. -
Q: What is the warranty period?
A: We offer a 12-month warranty against defects in workmanship and materials. Warranty covers repair or replacement of parts, excluding wear items like guide pins and bushings.
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