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The Science of Sealing: Uniseel’s Comprehensive 21-Patent Technical Portfolio
A Detailed Whitepaper on Manufacturing Innovation and Precision Engineering
Executive Summary: Defining Technical Authority
In the global B2B supply chain for metal closures, 'quality' is often used as a vague marketing term. At Hangzhou Uniseel Technology Co., Ltd., and our manufacturing hub, Hangzhou Lin’an Shengxiang Technology, we redefine quality through the lens of intellectual property and engineering rigor. With a portfolio of 21 active patents, our technical authority is not just claimed—it is documented and verified by the State Intellectual Property Office (CNIPA).
This whitepaper provides a comprehensive overview of our 21 patents, categorized by their impact on precision manufacturing, automation, and product innovation. For our global partners, this represents a unique 'Zero-Leakage' guarantee backed by thirty years of specialized R&D.
Category I: Precision Stamping and Die Engineering
The core of the 'Unishell' advantage lies in the initial formation of the cap. Achieving a ±0.1mm tolerance standard requires specialized tooling that compensates for material elasticity and high-speed friction.
1. Patent ZL 2023 2 3287198.X – High-Precision Stamping Die
This is the foundational patent for Uniseel's precision. It features a multi-stage ejection mechanism that prevents thin tinplate sheets from sticking to the mold surface during high-frequency cycles. By eliminating 'material cling,' we maintain absolute uniformity in cap I.D. (Internal Diameter), ensuring a consistent fit across millions of units.
2. Patent CN202510621091.9 – Internal Threading Equipment (Invention)
As our most recent 2025 breakthrough, this invention patent covers the hardware used to automate the formation of internal threads in metal closures. It allows for the creation of threads that are smooth to the touch but deep enough to lock onto glass or PET bottle rims with maximum torque resistance.
Category II: Intelligent Automation & High-Consistency Production
Scalability without consistency is a liability. Uniseel’s automated production line is built using hardware that we designed and patented internally to remove human error from the equation.
3. Patent CN202520546964.X – Intelligent Stamping Production Line
This system integrates automatic plate clamping and synchronized positioning sensors. It ensures that every stroke of the press lands exactly on center, minimizing edge-trimming waste and ensuring the wall thickness of the cap remains uniform.
4. Patent CN202520546965.4 – Intelligent Curling Equipment
The 'curl' or 'hem' of a metal cap is where consumers interact with the product. Our curling equipment utilizes patented 'Ring Segment Clamps' that adjust dynamically. This allows us to produce perfectly rounded, safe-to-handle edges for cap sizes ranging from 38mm to 58mm without lengthy downtime for mold changes.
5. Patent CN202520534753.4 – Automatic Feeding Device
To maintain a 24/7 high-speed production rhythm, this feeding device uses a dual-拨杆 (shuttle) system to prevent jams. It ensures a steady, timed input of raw materials, which is critical for maintaining thermal stability in the machines.
Category III: High-Value Product Innovation (Industry-Specific)
We solve specific industry pain points—from crystallization in honey to radiation sensitivity in pharmaceutical reagents.
6. Patent CN223865441U – Anti-Adhesion Hygienic Cap (Honey & Syrup)
A revolutionary design for the food industry. It includes an internal scraper that automatically wipes the bottle rim clean during the unscrewing process. This prevents the crystallization of sugars, ensures a smooth reopening experience, and improves overall hygiene.
7. Patent ZL 2023 2 3012889.9 – Anti-Radiation Dual-Layer Sealing Bottle
Designed for high-sensitivity reagents and pharmaceuticals. This patent describes a composite structure featuring a glass inner core for chemical stability and a specialized metal outer shell for light and radiation shielding, coupled with a flexible deformation layer to absorb impact.
The Full Catalog of 21 Uniseel Patents
Below is the complete registry of intellectual property held by Hangzhou Lin’an Shengxiang Technology Co., Ltd., acting as the manufacturing force for the Uniseel brand.
ZL 2023 2 3287198.X: High-Precision Precision Stamping Die for Metal Closures.
CN202510621091.9: Advanced Internal Threading Automation for Metal Packaging.
CN202520546964.X: Intelligent Integrated Stamping Production Line.
CN202520546965.4: Variable-Diameter Intelligent Curling Equipment.
CN202520534753.4: High-Efficiency Automated Material Feeding System.
CN223865441U: Integrated Scraper Anti-Adhesion Cap for Viscous Liquids.
ZL 2023 2 3012889.9: Dual-Layer Anti-Radiation Shielding Sealing Bottle.
CN223865430U: High-Pressure Resistance Dual-Layer Bottle Cap.
CN223865440U: Anti-Clogging Mechanism for Powder/Liquid Closures.
CN221434750U: Curling Pre-treatment Device for Enhanced Edge Smoothing.
CN221115103U: Ergonomic Easy-Open/Close Low-Torque Cap Design.
CN221112162U: Hermetic Sealing Production and Verification Device.
CN221109686U: Multi-Functional Integrated Cap Processing Station.
ZL 2018 2 0222948.5: Tin-Aluminum Bimetal Composite Sealing Technology.
ZL 2018 2 0215930.2: Reinforced Structural Integrity Metal Closure.
CN201810126579.4: Bimetal Composite Forming Method for High-Durability Caps.
CN201521106074.X: Next-Generation Multi-Claw Twist-off Mechanism.
CN201520133596.2: High-Compression Sealing Liner for Volatile Reagents.
CN201520132677.0: One-Piece Deep-Draw Metal Closure Structure.
CN201420312397.3: Tamper-Evident Easy-Open Safety Cap.
CN201420175657.7: One-Piece Internal Threaded Sealing Cap for Glass Jars.
Technical FAQ: Manufacturing Excellence
Q: How do these patents affect the cost of Uniseel products?
A: Our patents for intelligent automation (like CN224026254U) actually reduce costs by increasing yield rates and decreasing material waste, allowing us to offer premium quality at highly competitive prices.
Q: Can these patented designs be customized for my brand?
A: Absolutely. Our patent for intelligent curling (CN224026207U) specifically allows for rapid customization of cap dimensions, ensuring your unique packaging requirements are met with precision.
Q: Why is the ±0.1mm tolerance standard so important?
A: Most sealing failures are caused by 'Tolerance Stack-up.' By holding a tight ±0.1mm standard via our patented die technology, we ensure that the cap always interacts correctly with the liner and bottle rim, providing a perfect seal every time.
Hangzhou Uniseel Technology Co., Ltd.
Innovation Built on Precision | Certified for the Global Market
www.uniseel.com
