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Author: Site Editor Publish Time: 04-15-2026 Origin: Site
In PCB (Printed Circuit Board) manufacturing, cleaning and drying are critical steps that directly affect product yield and reliability. After etching, developing, electroplating, or cleaning processes, moisture, particles, and even chemical residues often remain on the board surface. Improper handling can not only affect subsequent processes but also lead to short circuits, corrosion, and other potential problems.
Air Knife, as a highly efficient airflow handling device, is gradually becoming an important solution in PCB production lines, replacing traditional wiping or natural air drying.
An air knife is essentially a device that creates a uniform "air curtain" using high-pressure airflow. By using a high-pressure blower or compressed air system, it generates a high-speed, stable, and continuous airflow at the outlet for blowing, peeling, or drying workpiece surfaces.
In PCB manufacturing, its core functions are:
Rapidly removing water film from the board surface
Blowing away tiny particles and residual impurities
Improving drying uniformity and avoiding localized residual water
Reducing manual intervention and increasing automation.
Compared to traditional methods, air knife is more suitable for continuous, high-volume production environments.
In actual production, the challenges of PCB surface treatment go far beyond simple drying:
Complex PCB Structure: PCBs typically contain microvias, circuit grooves, and other structures where moisture easily traps, making thorough removal difficult with ordinary air drying.
Strong Water Film Adhesion: After chemical treatment, the water film on the PCB surface exhibits enhanced adhesion, making it difficult for low-speed airflow to effectively remove.
High Cleanliness Requirements: The electronics industry has extremely strict particle control requirements; any residue can affect electrical performance.
High Production Line Cycle Time Requirements: Production lines typically operate continuously, requiring the drying process to be completed within a very short time.
These issues dictate that the equipment must not only have airflow, but also stable, uniformly distributed, and controllable airflow.
Air Knife uses a slit-type air outlet structure to compress and accelerate airflow, forming a high-speed air curtain. When a PCB passes through this airflow area:
1. The high-speed airflow disrupts the surface tension of the water film.
2. It peels moisture off the board surface.
3. It simultaneously carries away attached particles.
4. It achieves rapid, contactless drying.
The key to this process lies in the synergy of three parameters:
Air velocity: determines peeling capability
Air volume: determines coverage area
Distance: affects efficiency.
If the parameters are properly matched, uniform drying can be achieved in a very short time.
A complete PCB air-knife drying system typically includes:
1. Air Knife Body
Material: Commonly aluminum alloy or stainless steel
Air outlet structure: Precision slit design
Length: Customized according to PCB width
2. Air Source System
High-pressure fan (common choice)
Or compressed air system (suitable for localized high-precision requirements)
3. Mounting Structure
Adjustable angle bracket
Synchronized design with conveyor line
4. Control System
Airflow regulation
Start/stop linkage
Energy-saving control
Proper system integration is often more critical than the performance of individual devices.
When selecting a fan, it is recommended to focus on the following dimensions:
1. Airflow Speed and Uniformity
PCB drying relies more on "uniform airflow" than single-point high pressure.
2. Material Matching
Normal environments: Aluminum alloy is sufficient.
High-cleanliness or corrosive environments: Stainless steel is recommended.
3. Noise Control
High airflow speeds are often accompanied by noise issues, requiring the integration of soundproofing design.
4. Energy Consumption
The energy efficiency of the fan system directly affects long-term operating costs.
5. Compatibility with Production Lines
This includes conveyor speed, installation space, and ease of maintenance.
In PCB applications, Air Knife offers significant advantages over other solutions:
Non-contact processing, avoiding scratches on the board surface
Fast drying speed, suitable for high-speed production lines
Uniform airflow, reducing the risk of residual water
Continuous operation, low maintenance costs
Easy integration into automation systems
Therefore, Air Knife has gradually become a standard feature in mid-to-high-end PCB production lines.
What if the Air Knife isn't drying properly?
This is usually related to the following factors:
Insufficient airflow
Excessive installation distance
Inappropriate angle
We recommend optimizing by adjusting the angle (usually 30°~45°) and distance.
Do I need multiple Air Knife units?
For high-speed production lines or complex panel shapes, multi-stage drying is more stable.
Fan or compressed air?
Large area drying: Fan preferred (energy saving)
Localized fine processing: Compressed air is more flexible
As PCB manufacturing evolves towards higher density and precision, the demands on cleaning and drying processes are constantly increasing. Air Knife, with its stable airflow control and excellent adaptability, is becoming a key piece of equipment for improving production efficiency and product consistency.
If you are evaluating or optimizing your PCB cleaning and drying solutions, choosing the right Air Knife system will directly impact the performance of your entire production line. Xinhou specializes in industrial airflow solutions and can provide customized Air Knife configurations and technical support based on different PCB process requirements, helping you achieve more efficient and stable production goals.
