Explore our industrial-grade refrigeration components engineering catalog, serving leading global brands since 1988.
Ningbo Taojun Refrigeration Equipment Co., Ltd. (Juntao Refrigeration) is strategically situated in Xiangshan, Ningbo, a globally recognized hub for high-precision manufacturing. Established in 1988, our lineage traces back to the prestigious Xiangshan Refrigeration Accessories Factory of Zhejiang University. Over the past three decades, we have scaled our operations into a comprehensive National High-Tech Enterprise (certified in 2021) encompassing design, metallurgical R&D, advanced fabrication, and global logistics.
Our core product portfolio includes: high-efficiency copper filter driers, Level Wound Coils (LWC) copper tubing, check valves, condenser coils, and heavy-duty refrigeration fittings. Operating under our premium proprietary brands "Taojun" and "Lingshan", our systems have achieved foundational benchmarks like ISO9001:2015, EU RoHS, REACH, and US UL certifications.
In the highly demanding sectors of Heating, Ventilation, Air Conditioning, and Refrigeration (HVAC/R), the physical and chemical characteristics of copper tubing act as critical lifelines for system efficiency and operational life. Among these materials, Soft Annealed Level Wound Coils (LWC) representing copper standard C12200 stand as the gold standard for automated industrial production lines. By packaging continuous, tightly coiled lengths of copper tubing on reels, manufacturers of heat exchangers, evaporators, and condensers can achieve seamless automation, minimize waste, and maintain exceptional mechanical reliability.
Information Gain Insight: As eco-friendly refrigerants like R32, R290 (propane), and CO₂ become mainstream under global hydrofluorocarbon (HFC) phase-down mandates, heat exchangers are forced to operate at much higher working pressures. Standard copper tubing is no longer sufficient. Modern HVAC engineering requires high-tensile, low-eccentricity Soft Annealed LWC with micro-grain structures optimized to resist high thermal stresses and vibration fatigue.
Soft Annealed LWC copper tubes manufactured at Ningbo Taojun conform to major global standards including ASTM B280, ASTM B68, EN 12735-1, and JIS H3300. The raw materials used are exclusively high-purity Phosphorus-Deoxidized Copper (UNS C12200 / Cu-DHP), with a minimum copper content of 99.90% and phosphorus levels strictly managed between 0.015% and 0.040%. This controlled formulation ensures excellent weldability, thermal conductivity, and long-term resistance to hydrogen embrittlement.
| Parameters | Standard Specifications (ASTM B280 / EN 12735-1) | Taojun Precision Standards |
|---|---|---|
| Chemical Composition | Cu ≥ 99.90%, P: 0.015% - 0.040% | Cu ≥ 99.95%, P: 0.020% - 0.035% |
| Temper State | Soft Annealed (O60) | O60 (Homogeneous micro-grain structural profile) |
| Grain Size | 0.025 mm - 0.045 mm | 0.030 mm - 0.040 mm (Strictly controlled via inert gas furnaces) |
| Tensile Strength | ≥ 205 MPa | 215 MPa - 245 MPa |
| Elongation | ≥ 40% | ≥ 45% (Ensures zero-fracture bending and flaring) |
| Internal Cleanliness | ≤ 0.038 g/m² residual carbon | ≤ 0.015 g/m² (Purged with pressurized high-purity nitrogen) |
B2B procurement agents in regions like North America, Western Europe, and Japan look beyond unit pricing. They focus on overall cost-of-quality, supply chain consistency, and regulatory compliance. Key commercial buying intent variables include:
Uninterrupted Spool Lengths: Modern automated coil-winding machines require maximum package weights (ranging from 100 kg to 300 kg per spool) without joints or welds. Taojun utilizes continuous casting and drawing processes to supply continuous copper LWC rolls that reduce scrap rates by up to 15% compared to low-tier alternatives.
Inner Surface Cleanliness: Modern polyester (POE) and polyalkylene glycol (PAG) lubricants used with HFC and natural refrigerants are extremely sensitive to residual chlorides and paraffin oils left inside the tubes. Any residue can lead to compressor failure. Taojun meets these requirements by maintaining strict cleanroom production protocols and purging the inner surface of the tubes with pressurized dry nitrogen.
In response to global demands for supply chain resilience, Taojun has transformed its Xiangshan production base into a state-of-the-art Factory 4.0 facility. By integrating our custom MES (Manufacturing Execution System) with advanced German-imported metallurgical equipment, we monitor and record every step of the casting, drawing, bright annealing, and packaging stages in real-time.
During the critical soft annealing process, we subject the copper tubes to high-temperature heat treatment in a computer-controlled protective atmosphere (nitrogen/hydrogen mix) bright annealing furnace. This prevents oxidation and ensures the tubes remain completely bright, scale-free, and uniform in hardness. Additionally, inline Eddy Current Testing (ECT) scans 100% of the coils to detect and automatically mark pinholes, cracks, or wall anomalies, guaranteeing a structural defect rate of under 0.05%.
Soft Annealed LWC copper tubes are highly versatile components used in various specialized HVAC/R applications:
Variable Refrigerant Flow (VRF) Systems: These systems require high-pressure piping networks that span large commercial buildings. The uniform wall thickness and ductility of Taojun LWC prevent wall thinning and micro-fractures at sharp bends.
Automotive Air Conditioning: Micro-bore LWC tubes are increasingly used in electric vehicle heat pumps. The high vibration-resistance of C12200 soft annealed copper keeps the system leak-free under constant mechanical movement.
Commercial Ice Machines & Display Cabinets: In these systems, copper tubes are wrapped tightly around evaporators. High ductility allows for extremely small bending radii without flattening the tube profile, maximizing contact area and heat transfer efficiency.
How we combine advanced materials science, strict quality controls, and modern factory management to deliver premium products.
Our core production lines, drawing equipment, and bright annealing furnaces are imported directly from Germany, ensuring precise tolerances of ±0.02mm.
Backed by our technical partnership with Zhejiang University and the University of Science and Technology of China (USTC), our team includes 15 PhD and master engineers.
We provide full customization for dimensions, tempers, wall thicknesses, and internal micro-fin structures. Our services range from prototype design to full-scale mass production.
Our raw copper cathodes and critical raw materials are imported from trusted global mining brands. Our liquid crystal spacers are sourced directly from Japan, and our custom sealants are imported from Europe.
We run thermal shock tests (from -35°C to 75°C for 500 hours), helium leak testing, high-voltage aging, and 100% online eddy current verification to ensure long-term structural integrity.
Registered under CNCA (Registration No.: 41325Q00065R0S). We implement a 5D quality management system, checking everything from basic materials to post-installation feedback.
Take a virtual look at our MES-integrated casting workshops, laboratories, and testing centers.
1998: Established our first dedicated factory building in Ningbo, focusing on standard domestic refrigeration accessories.
2008: Deployed our MES intelligent workshop management system, transitioning to semi-automated production lines.
2024: Expanded our global smart facility, upgrading to fully automated bright annealing ovens and real-time ERP/MES integrations.
Our soft annealed level wound coils and copper fittings are widely used in critical thermal transfer applications around the world.
Verifiable ISO 9001:2015 quality management documentation and international compliance certifications.
Main ISO 9001 Document
Detailed Scope of Certification
National High-Tech Certificate
EU RoHS Directive Approval
US UL Safety Listing
Get answers to common technical, logistics, and quality questions from global procurement officers.
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