Air knife layout is not only a mounting choice. It decides where the air hits, where the water or debris moves, and whether the product is truly dry before the next process. A top air knife may clear the upper surface well but leave water under an edge. A side air knife may solve bottle-neck moisture but miss a flat top surface. A dual-sided layout may dry both faces of a panel, but it needs enough space, support, and balanced airflow.
The right air knife layout starts with the problem on the line. Which surface must be dry? Where does the liquid collect? Which direction should water move after blow-off? Can the machine frame support the knife without blocking access? These questions matter more than choosing the layout that looks simplest in a catalog.
For many drying and blow-off systems, QXY Machinery uses practical reference settings such as 20-50 mm knife-to-product distance, 15-45 degrees impingement angle, and 0.5-2 mm slot gap for general industrial drying. The layout still has to match the product geometry and process stage.
An Air Knife removes water, dust, chips, or coating residue by pushing it along a path. If the layout sends water toward a dead corner, guide rail, roller, or underside pocket, the surface may become wet again downstream. If the layout aims at the wrong face, the line may look active but still fail inspection.
Layout also changes how much air is needed. A well-placed knife can remove liquid with moderate pressure because the air works with gravity and conveyor travel. A poorly placed knife may need more air, more noise, and more energy just to push water in the wrong direction.
Before choosing top, side, or dual-sided air knife layout, map the product in three zones: the surface to clean or dry, the place where liquid collects, and the path where liquid should leave the machine. That simple map prevents many layout mistakes.
A side air knife is mounted beside the conveyor and aimed at the product edge or vertical face. It is often useful for bottles, cans, jars, containers, extrusions, profiles, sidewalls, label zones, caps, and products where water collects along a side surface.
Side layouts are practical before labeling, coding, printing, or inspection. A container may not need its full top surface dried, but the label panel, cap edge, neck, or side seam must be dry. In that case, a side knife can target the problem directly instead of wasting air across the full conveyor width.
Side air knives need careful guarding and adjustment. Product spacing, container wobble, guide rails, and conveyor vibration can change the working distance. If the knife is too close, it may push light containers or create splash. If it is too far, the side surface remains wet.
A dual-sided layout uses upper and lower air knives, or opposing knives, to dry both faces of a product as it passes through the station. QXY's air-to-air knife reference uses upper and lower air knives for simultaneous two-sided drying of flat products such as PCB boards, LCD glass, sheet metal, glass panels, and some food products.
This layout is useful when the underside matters. PCB boards, glass sheets, metal panels, and washed flat parts often carry water on both faces. A top knife can remove visible water, but the lower face may still drip onto the next process or leave marks during stacking.
Dual-sided systems need more attention to balance. The lower knife angle is easy to mount incorrectly, especially when installed upside down or under a conveyor. Both knives should receive enough air, and the lower jet should move water away from the product, not back into the conveyor or onto the underside.
Layout | Best for | Main caution |
Top air knife | Flat upper surfaces, panels, trays, lids, sheets, wide products, general conveyor drying. | May miss underside water, edge wraparound, holes, and recessed features. |
Side air knife | Bottles, cans, containers, vertical faces, label zones, cap edges, profiles, and side seams. | Needs stable product tracking and enough clearance from guides and guards. |
Dual-sided air knife | PCB boards, LCD glass, sheet metal, glass panels, flat parts that need both faces dry. | Requires balanced airflow, careful lower-knife angle, and safe drainage below the line. |
Multiple-angle layout | Complex parts, trays, parts with ribs, grooves, pockets, or mixed surface heights. | Can create turbulence if knives fight each other or push water back onto the product. |
Flat products usually start with a top layout or a dual-sided layout. If only the top surface must be dry, a top knife may be enough. If both faces matter, dual-sided drying should be considered early because adding a lower knife later may require conveyor and guard changes.
Round or cylindrical products often need side, angled, ring, or multi-position layouts. A straight top knife may blow across the highest point but leave water along the shoulder, neck, or lower side. For tubes, cables, pipes, and extrusions, a ring air knife can provide 360-degree coverage in one pass.
Irregular parts may need a more specific answer. A tornado air knife can help with complex 3D surfaces and recessed areas. Several smaller knives at different angles may work better than one large top knife if the part has ribs, pockets, holes, or fixture shadow zones.
The best layout is the one that gives water a clean exit. On a top layout, water often moves toward the trailing edge or side drain. On a side layout, water should leave the vertical face without being driven into a guide rail or label recess. On a dual-sided layout, the lower knife should push water into a collection path instead of spraying the conveyor underside.
A layout that works on paper can fail in maintenance. Top knives may block operator access to nozzles, sensors, or inspection points. Side knives may interfere with guide rails. Lower knives may be hard to clean and may collect debris if drainage is poor.
Before finalizing the layout, check bracket stiffness, adjustment range, cleaning access, air hose routing, noise shielding, and safety clearance. Long knives may need more support to avoid sagging. Dual-sided systems may need a balanced Y-split manifold so upper and lower knives receive stable airflow.
Material also matters. Aluminum alloy is often suitable for dry-zone and general industrial use. Stainless steel is usually better for food, beverage, pharmaceutical, washdown, or chemical-cleaning environments. PVC or titanium may be considered when the air knife is close to corrosive chemical zones.
Test the line with real products, real liquid load, normal conveyor speed, and normal product spacing. Empty-conveyor tests can hide side wobble, underside drip, and re-wetting from guards. Inspect the product at the air knife and again downstream.
Check each surface separately: top, side, edge, underside, recesses, and downstream contact points. Record air knife length, distance, angle, slot gap, inlet pressure, blower model, duct path, and product speed. This makes later troubleshooting much easier.
If one layout almost works but leaves a repeated wet zone, do not immediately increase blower pressure. First check whether the air is aimed at the right surface and whether the water has a clean way to leave the line.
Parameter | QXY reference value |
Top/side slot knives | Aluminum alloy, stainless steel, PVC, or titanium options depending on environment |
Dual-sided drying | Air-to-air upper + lower knives for flat products such as PCB, LCD glass, sheet metal, and glass panels |
Ring air knife | 360-degree coverage for cables, tubes, pipes, extrusions, bottles, and cylindrical products |
Tornado air knife | Rotating/turbulent airflow for complex 3D surfaces, recessed areas, product edges, and fixture cleaning |
Working distance | 20-50 mm for many drying and blow-off applications |
Impingement angle | 15-45 degrees from product surface, angled with conveyor travel for standard drying |
General slot gap | 0.5-2 mm standard for many blower-driven industrial drying tasks |
Custom capability | Custom length up to 6 m, slot width, hole pattern, inlet configuration, and material selection |
QXY Machinery (Shenzhen Qixingyuan Machinery Equipment Co., Ltd.)
is a high-tech enterprise integrating R&D, design, production, and sales, specializing in drying, dust removal, and water-blowing solutions for industrial applications. With over 10 years of focused expertise in the air knife field, QXY Machinery has developed a mature technical foundation and a complete in-house R&D system.
QXY Machinery has independently developed dozens of air knife models spanning aluminum alloy, stainless steel, PVC, titanium alloy, small hole PCB air knives, ring air knives, tornado air knives, and air-to-air configurations. For layout-sensitive drying lines, QXY can support top, side, dual-sided, ring, and multi-angle air knife configurations based on product shape, water path, line speed, and installation space.
QXY Machinery operates a complete production system supported by ample raw material supply and strict quality management. Stable processing capabilities and professional technical expertise enable reliable products, precise application support, and efficient after-sales service.
-> Contact QXY Machinery to discuss the right air knife layout for your drying or blow-off line.
Q: Which air knife layout is best for flat products?
A: Flat products often use a top air knife when only the upper surface must be dry. If both faces matter, a dual-sided air-to-air layout with upper and lower knives is usually more suitable.
Q: When should I use a side air knife?
A: Use a side air knife when the wet zone is on a vertical face, edge, cap area, label panel, side seam, or container shoulder. It is common for bottles, cans, jars, profiles, and container drying before labeling or coding.
Q: What is a dual-sided air knife layout?
A: A dual-sided layout uses upper and lower or opposing air knives to dry both faces of a product at the same station. It is useful for PCB boards, LCD glass, sheet metal, glass panels, and other flat products.
Q: Can I combine top and side air knives on one line?
A: Yes. Many lines use multiple knives when the product has more than one wet zone. The key is to aim each knife so water moves away from the product instead of into another surface or guard.
Q: Why does my top air knife leave water under the product edge?
A: A top knife may not reach underside wraparound, holes, lips, or recessed areas. You may need a side knife, lower knife, angled knife, or a different product support method.
Q: What information should I send QXY before choosing a layout?
A: Send product photos, wet-zone location, dry surfaces, line speed, spacing, air source, installation space, and material needs.
Need a custom air knife solution? Send us your application details, material requirement ，or air source type . Our engineering team will help you select the right model.
Shenzhen Qixingyuan Machinery Equipment Co., LTD.
info@airknifecn.com
Building 8, Wanfeng Third Industrial Zone, Xinqiao Street, Bao'an District, Shenzhen, Guangdong, China
