1.Industry Pain Points
Industry Pain Points in PCB Wet Process Cleaning
PCB production lines involve multiple wet processes such as etching, developing, rinsing, and chemical cleaning. After these stages, improper liquid removal can cause several critical issues:
✘ Residual water or chemicals remain on PCB surfaces, leading to oxidation or contamination;
✘ Incomplete drying causes water marks, ionic residues, and reduced electrical reliability;
✘ Manual air blowing or wiping is inconsistent and unsuitable for continuous conveyor lines;
✘ Traditional hot air drying consumes high energy and may cause board deformation.
These problems directly reduce PCB yield, increase rework rates, and affect downstream processes such as AOI, exposure, and printing.
2.Typical Application Scenarios
Typical PCB Cleaning & Drying Application Scenarios
| Application Scenario | Recommended Solution | Core Function |
|---|---|---|
| PCB Rinsing Section (After Etching) | Aluminum / Stainless Steel Air Knife + 3–5HP Fan | Remove surface water and chemical residue |
| Developing & Exposure Lines | Adjustable Air Knife + 2–3HP Fan | Uniform drying without board vibration |
| Conveyor Transfer Sections | Dual-Side Air Knife System | Prevent water carryover to next process |
| Final Cleaning Before AOI | Precision Air Knife + Low-Noise Fan | Ensure clean, dry board surface |
| High-Speed Wet Lines | High-Pressure Air Knife + Blower | Stable drying under fast conveyor speeds |
3.Why Air Knives Are Ideal for PCB Lines
Why Air Knife Drying Is Ideal for PCB Wet Process Lines
Efficient Liquid Removal
High-velocity, uniform airflow removes water and chemical residues within seconds, preventing oxidation and staining.
Non-Contact & Board-Safe
No physical contact with PCB surfaces, avoiding scratches, bending, or misalignment.
Compatible with Continuous Production
Designed for conveyor systems, supporting stable drying under constant line speeds.
Energy-Saving Compared to Hot Air
Focused airflow achieves faster drying with significantly lower energy consumption.
4.Technical Specifications
Technical Specifications for PCB Cleaning Applications
Air Knife Parameters
Air gap width: 0.1–3mm (commonly 0.1–1.5mm for PCB lines)
Airflow uniformity: ≥95%
Materials: Aluminum alloy / Stainless steel
Structure: Adjustable / Linear air knife
Fan & Blower Parameters
Power range: 2–7.5HP
Max air volume: 210–530 m³/h
Rated pressure: 190–330 mbar
Continuous-duty design for 24/7 operation
5.Recommended Air Knife Types
Commonly used air knife solutions for PCB cleaning lines include:
Aluminum Adjustable Air Knife – suitable for most PCB wet process drying
Stainless Steel Air Knife– for corrosive chemical environments
Dual-Side Air Knife Systems – for double-sided PCB drying
High-Pressure Blower Systems – for high-speed conveyor lines
6.FAQ: Air Knife Solutions for PCB Cleaning
Q1: Where are air knives typically installed in PCB wet lines?
A: Usually after rinsing, etching, or cleaning sections, directly above or beside conveyor belts to remove residual liquid before the next process.
Q2: Can air knives damage thin or flexible PCBs?
A: No. Properly selected air knives provide uniform airflow without physical contact, making them suitable even for thin or high-density boards.
Q3: How do air knives compare with hot air drying in PCB lines?
A: Air knives offer faster drying, lower energy consumption, and better process stability than traditional hot air systems.
Q4: Can air knife length be customized for PCB conveyor width?
A: Yes. Air knives can be customized from 500mm to over 3000mm to match different PCB conveyor widths.
For PCB cleaning lines with different board sizes, conveyor speeds, and chemical environments, our engineers can recommend an optimized air knife configuration to improve drying efficiency and line stability.
+86-13714372230
Kelly@airknifecn.com
