Air-Knife Systems — 5 Series
Each series is engineered for a specific duty cycle, temperature range and material requirement. All series are compatible with Nopassy high-speed centrifugal blowers and high-pressure blowers.
Air-knife blow-off principle — high-velocity air curtain in action (Original Nopassy animation)
Aluminum Alloyed Air-Knife
Lightweight, general-purpose drying and blow-off
Key Features
- 6061 aluminum alloy — light and corrosion-resistant
- Adjustable outlet 0.3–3 mm for fine tuning
- Custom lengths up to 6 meters
- Air amplification 40:1 — high thrust with low air consumption
- Pairs with Nopassy high-speed centrifugal blowers or high-pressure blowers
Specifications
| Material | 6061 aluminum alloy |
|---|---|
| Air Amplification | 40:1 |
| Outlet / Air Pattern | 0.3–3 mm adjustable slit |
| Length / Format | up to 6 m |
| Max Air Speed | up to 400 m/s |
| Max Temperature | up to 250 °C |
| Max Pressure | up to 5 kgf/cm² |
| Flow Precision | ±5% |
Stainless Steel Air-Knife
Food-grade, medical-grade, chemical-resistant
Key Features
- SUS304 standard / SUS316 medical-grade option
- Resists acidic and alkaline fumes in plating and chemical plants
- Air amplification 40:1 with ±5% flow precision
- Operating temperature up to 250 °C
- Welded end caps prevent leaks; ideal for food and pharmaceutical lines
Specifications
| Material | SUS304 / SUS316 |
|---|---|
| Air Amplification | 40:1 |
| Outlet / Air Pattern | 0.3–3 mm adjustable slit |
| Length / Format | up to 6 m |
| Max Air Speed | up to 400 m/s |
| Max Temperature | up to 250 °C |
| Max Pressure | up to 5 kgf/cm² |
| Flow Precision | ±5% |
Super Air-Knife (Coanda)
Low noise, low air consumption, balanced curtain
Key Features
- Compression ratio 40:1 — low air consumption, high thrust
- 36% less compressed air than conventional gas-proof curtains
- Noise 11× lower than standard air curtains
- Width 100–1220 mm with pressure regulator
- Used with standard air compressors (no blower required)
Specifications
| Material | Aluminum or Stainless Steel |
|---|---|
| Air Amplification | 40:1 |
| Outlet / Air Pattern | curtain 100–1220 mm |
| Length / Format | curtain style |
| Max Air Speed | high pressure low speed |
| Max Temperature | ambient |
| Max Pressure | from air compressor |
| Flow Precision | continuous sheet |
Coanda Effect Air-Knife
Continuous uninterrupted high-speed airflow
Key Features
- Coanda effect — fluid jet stays attached to the curved profile for stable straight-line flow
- Specially extruded edge extends 3.3 mm beyond standard knives for stronger pneumatic clamping
- Anti-corrosion anti-leakage end-cap design
- Drip-shaped pneumatic clamp for high-speed continuous air
- Max air flow 400 m/s, max temperature 250 °C, max pressure 5 kgf/cm²
Specifications
| Material | Aluminum / Stainless |
|---|---|
| Air Amplification | continuous |
| Outlet / Air Pattern | extended 3.3 mm edge |
| Length / Format | up to 6 m |
| Max Air Speed | up to 400 m/s |
| Max Temperature | up to 250 °C |
| Max Pressure | up to 5 kgf/cm² |
| Flow Precision | stable straight line |
Spider Arm Air-Knife (Bottle Drying)
Flexes around every bottle — 60,000 BPH
Key Features
- Flexes to any position — no dead angle around bottle or can
- Drying time per container 3–5× longer than conventional head-to-head air knives
- Up to 80% energy reduction vs traditional bottle-drying systems
- Multi-step layout: high-to-low along the line for progressive drying
- Achieves 60,000 bottles/hour with 1/3 energy of compressed air and 1/2 of high-pressure blower systems
Specifications
| Material | SUS304 + polyoxymethylene nozzles |
|---|---|
| Air Amplification | high volume |
| Outlet / Air Pattern | inline nozzles 25×1.8 mm |
| Length / Format | line-width |
| Max Air Speed | high volume low pressure |
| Max Temperature | -50 to +110 °C |
| Max Pressure | system pressure |
| Flow Precision | no dead angle |
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Frequently Asked Questions
Common questions engineers ask when specifying, installing and servicing Nopassy blowers.
What is the maximum temperature an air-knife can handle?
Aluminum knives: up to 80 °C continuous. Type 303 stainless: 200 °C. Type 316 stainless: 427 °C. For higher temperatures specify the high-temperature kit with heat-resistant fittings and reinforced gaskets.
How do I size the blower for an air-knife system?
Multiply knife length by 2.9 SCFM/inch at 80 PSIG for compressed-air knives. For blower-driven systems, select a centrifugal or side-channel blower delivering the required airflow at working pressure, with a 20% margin for future load increases.
What is the difference between Standard, Super and Coanda air-knives?
All three use the Coanda principle. Standard knives: 30:1 amplification, cost-effective. Super knives: 40:1 amplification, 69 dBA, uniform force across the full length. Coanda knives are for tight spaces where air must wrap around curved surfaces.
How often should I clean an air-knife?
Weekly in dirty environments, monthly in clean rooms. Disconnect supply, wipe the slot with a soft cloth, and inspect the Coanda surface for nicks. A damaged Coanda surface causes airflow instability and lost drying performance.
Can air-knives replace compressed-air blow-off?
Yes, in most cases. Blower-driven air-knives use 1/3 the energy of compressed-air nozzles for the same blow-off force, run quieter (69 dBA vs 100+ dBA), and cut plant air demand by up to 70%.
