In general-purpose conveyor lines, such as electronics manufacturing, packaging, and post-cleaning processes, inadequate drying has been a long-standing issue.
Many companies discover that even after installing air knife systems, water still remains on product surfaces. To compensate, they often resort to additional manual labor or lengthening the drying section, which increases cost and complexity.
Through long-term collaboration with clients, we have observed a common phenomenon:
Whenever drying issues occur, the first assumption is that the air knife itself is faulty.
However, in multiple conveyor line projects undertaken by Shenzhen Qixingyuan Machinery Equipment Co., LTD (Qixingyuan), issues caused by the air knife’s inherent quality are relatively rare. In most cases, the root cause lies in selection logic and operational usage, rather than the equipment itself.
General-purpose conveyor lines are widely used in:
Electronics manufacturing (PCB and component post-cleaning drying)
Food, daily chemical, and packaging industries
Metal and component surface finishing drying
These applications share several characteristics:
Product specifications are relatively uniform
Continuous production rhythm
Priority on stability over extreme performance
Because of this, most companies choose aluminum air knives as the preferred drying solution.
In Qixingyuan’s historical projects, aluminum air knives account for over 70% of all general-purpose conveyor line installations, making them the most typical — and simultaneously the most often “misused” — category of air knives.
Products remain wet despite seemingly strong airflow
During on-site testing, airflow can feel powerful, yet a thin water layer remains, especially on flat surfaces.
Residual water concentrated at edges or ends
While central areas are dry, water often remains on edges or corners, affecting downstream processes.
Energy consumption increases without improved results
In an attempt to “dry faster,” companies may increase air pressure or install a more powerful blower. The result is higher energy usage and noise, without significant improvement in drying efficiency.
In Qixingyuan optimization projects, these three issues often occur simultaneously, with very similar underlying causes.
Many clients say:
“We have tried air knives before, and they didn’t work well.”
Upon further investigation, the following patterns emerge:
Air knife length was selected to just match product width
Outlet angle depended on existing installation habits
Air supply parameters only referred to the maximum rated values
The real problem is:
No system-level selection based on the conveyor line’s actual operating conditions
Treating the air knife as a standalone component rather than as part of a system
Aluminum air knives are Qixingyuan’s best-selling and most widely applied product type. They are not “overrated,” but they are frequently misused.
General-purpose conveyor line drying
Applications where cost, stability, and efficiency are balanced
Continuous operation with low maintenance frequency
Drying deep holes or complex 3D structures
Processes requiring extremely high instantaneous wind pressure
From Qixingyuan’s engineering experience, when matched to the proper operating conditions, aluminum air knives can operate reliably for 5–8 years or longer.
Mistake 1: Air knife length only “just covering the product”
Many overlook the edge airflow decay.
Recommendation: Length should exceed product width by 10–20% to ensure consistent airflow across the effective drying area.
Mistake 2: Air blows directly perpendicular to the surface
Drying is not about “blowing the water away,” but about breaking water adhesion using shear airflow.
In most conveyor lines, a 10°–30° angle relative to the surface performs better than direct perpendicular airflow.
Mistake 3: Focusing only on air knife specifications while ignoring air supply matching
In Qixingyuan’s project practice, over 50% of unstable drying issues arise from mismatched air supply and air knife characteristics.
Based on Qixingyuan’s real cases in electronics manufacturing and packaging:
Stability over maximum airflow
In continuous operations, stable and uniform airflow coverage is far more important than short-term peak wind.
Plan water discharge paths first
Correct installation angles and distances significantly reduce dependence on high wind pressure.
Treat the air knife as part of a system
The air knife, blower, piping, and mounting structure must all work together.
In multiple optimization projects, simply adjusting selection and installation improved drying efficiency by 30–50% while keeping energy consumption nearly unchanged.
In general-purpose conveyor line drying:
Suitable ≠ Most expensive
Suitable ≠ Maximum airflow
Aluminum air knives dominate the market not because they are cheap, but because when correctly selected and used, they provide stable, controllable, and reliable overall performance.
If your line is experiencing unstable drying or high energy consumption, it is worth reviewing your selection logic before rushing to upgrade equipment.
If you are using aluminum air knives but still face unstable drying, residual water, or high energy consumption, do not rush to replace them with more expensive units.
In most general-purpose conveyor line projects, issues usually originate from selection logic, air knife length, installation angle, or air supply matching, rather than the air knife’s intrinsic quality.
As a long-standing equipment supplier specialising in the design of water removal solutions for production lines, Qixingyuan prioritises conducting operational condition analyses during the initial stages to assist clients in identifying potential optimisation opportunities within existing setups, rather than simply recommending ‘upgraded models’.
Sometimes, the right decision is more valuable than a new device.
Q1: Can aluminum air knives fully dry products?
Yes, provided selection and installation are correct. In Qixingyuan’s projects, aluminum air knives meet over 70% of standard drying requirements without upgrading to stainless steel.
Q2: Why does water remain despite high airflow?
Drying is not “more airflow equals better drying.” Air angle, shear formation, and water discharge paths are often more critical than airflow volume alone.
Q3: How long can aluminum air knives last?
In non-corrosive environments such as electronics manufacturing and packaging, 5–8 years of stable operation is very common.
Q4: Do I need a high-power blower?
Not necessarily. With proper air supply and controlled piping losses, medium-power blowers can achieve stable drying. Increasing power blindly may waste energy.
Q5: When should I reassess selection?
Evaluate if any of these occur:
Significant drop in drying efficiency
Change in product size or structure
Production speed changes
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Kelly@airknifecn.com
