In the production of precision PCBs (such as IC substrates, RF PCBs, and flexible precision PCBs), continuous drying is a key process to ensure circuit accuracy, solder mask adhesion, and substrate stability. Precision PCB manufacturers face three core pain points: first, the poor temperature control uniformity (±2℃) of traditional batch drying equipment leads to circuit deformation and solder mask bubbles after drying of precision PCBs, with a yield rate of only 90%; second, the low drying efficiency (3 hours per batch, daily output of 2000㎡) cannot meet the monthly order demand of 100,000㎡ for IC substrates; third, frequent manual loading and unloading easily cause surface scratches on precision PCBs (with a scratch rate of 3%), and the lack of traceability of drying parameters makes it difficult to meet the quality audit requirements of high-end fields such as automotive electronics and medical equipment. To break through the production bottleneck, Shanghai Guanding has customized a continuous drying solution for precision PCBs, covering three core processes: substrate pre-treatment drying, post-circuit etching drying, and solder mask curing drying.

1. Core Equipment Configuration and Technical Parameters

Equipment Type	Quantity	Key Technical Parameters	Application Scenarios
Precision Tunnel-Type Continuous Drying Line	3 lines	Temperature Control Range: 50~200℃ (Accuracy ±0.3℃); Conveying Speed: 0.2~1.5m/min (frequency-variable adjustable); Drying Section Length: 12m (6 independent temperature control zones); Heating Method: Infrared Radiation + Hot Air Circulation (Hot Air Cleanliness Class 100); Conveyor Belt: Anti-Static Teflon Mesh Belt (thickness 0.5mm, tension uniformity ±2%)	Continuous drying of precision PCBs, suitable for high-precision products such as IC carrier boards and RF PCBs
Online Visual Inspection System	3 sets	Inspection Accuracy: 0.01mm; Inspection Items: Circuit Deformation, Solder Mask Bubbles, Surface Scratches; Inspection Speed: Synchronous with Drying Line (max. 1.5m/min); False Detection Rate ≤0.5%	Real-time quality inspection after drying, replacing manual visual inspection
Drying Parameter Traceability System	1 set	Data Collection Items: Zone Temperatures, Conveying Speed, Drying Duration, Inspection Results; Storage Period: 3 years; Query Method: QR Code Scanning (unique QR code for each PCB) / Batch Number	Full-process parameter traceability to meet quality audits in high-end fields

2. Core Technical Advantages of the Solution

• Ultra-Precision Temperature Control System: Adopts dual "PID + Fuzzy Control" algorithms, combined with imported PT1000 sensors (accuracy ±0.1℃). The temperature fluctuation in 6 drying zones is ≤0.3℃, solving the problem of "circuit deformation caused by local overheating" in traditional equipment, and increasing the dimensional stability of precision PCBs to 99.8%.

• Efficient & Clean Drying: Hot air undergoes primary + secondary + high-efficiency three-stage filtration (cleanliness Class 100) to prevent dust adhesion from affecting PCB surface precision; infrared + hot air composite heating increases heat transfer efficiency by 40%, reducing the drying time of IC carrier boards from 3 hours to 1.2 hours.

• Anti-Static & Anti-Scratch Design: The conveyor belt is made of anti-static Teflon material (surface resistance 10?~10?Ω), equipped with an automatic deviation correction system (deviation ≤1mm) to reduce PCB scratch caused by friction; the loading/unloading ends are equipped with vacuum suction cup manipulators to replace manual operation, reducing the scratch rate from 3% to 0.2%.

• Full-Link Intelligent Traceability: Each PCB is assigned a unique QR code; scanning the code allows viewing of temperature curves of each zone, conveying speed, and visual inspection reports during the drying process. Data is automatically synchronized to the customer’s ERP system, meeting IATF16949 (Automotive Electronics) and ISO 13485 (Medical Devices) quality standards.

3. Project Implementation Process

1. Demand Research Phase: Conduct in-depth visits to the customer’s clean workshop (Class 1000), analyze precision PCB types (IC carrier boards with 0.1mm line width, RF PCBs with 0.05mm dielectric layer thickness), humidity requirements before and after drying (≤0.1% after drying), and monthly capacity gap; test the dimensional deviation and yield data of traditional equipment after drying.

2. Solution Design & Confirmation: Issue equipment layout diagrams (adapting to the clean workshop workflow, reserving 1.5m maintenance channels), drying process parameter tables (e.g., IC carrier boards: 6-zone temperatures 80℃→120℃→150℃→180℃→150℃→100℃, conveying speed 0.8m/min), and cleanliness compliance plans; conduct joint reviews with the customer’s technical and quality teams.

3. Equipment Production & Commissioning: Manufacture the main body of the drying line using 304 stainless steel (corrosion-resistant, easy to clean) at the Kunshan production base; conduct a 96-hour no-load test run after equipment assembly (to test temperature control accuracy, cleanliness, and conveying stability), and simultaneously debug the visual inspection algorithm.

4. On-Site Installation & Training: Dispatch a professional team (with clean workshop construction qualification) for on-site installation, adopting a dust-free construction process (laying dust-proof film throughout the process, using clean tools); provide phased training for operators, quality inspectors, and maintenance personnel, with assessment content including equipment parameter setting, fault handling, and cleanliness maintenance.

5. After-Sales Support (Free Warranty + Quarterly Cleanliness Inspection): Provide on-site inspection during the warranty period (including temperature control accuracy calibration and filter replacement), and issue quarterly cleanliness inspection reports; respond to equipment failures within 1 hour and provide on-site maintenance within 24 hours (equipped with clean workshop maintenance tools).