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Knife Bar
About Air Knife
An AIR KNIFE is a tool used to blow off liquid or debris from products as they travel on conveyors. Air knives are normally used in manufacturing or as the first step in a recursive recycling process to separate lighter or smaller particles from other components for use in later or subsequent steps, post manufacturing parts drying and conveyor cleaning, part of component cleaning. The knife consists of a high intensity, uniform sheet of laminar airflow sometimes known as streamline flow.
An industrial air knife is a pressurized air plenum containing a series of holes or continuous slots through which pressurized air exits in a laminar flow pattern. The exit air velocity then creates an impact air velocity onto the surface of whatever object the air is directed. This impact air velocity can range from a gentle breeze to greater than Mach 0.6 (40,000 ft/min) to alter the surface of a product without mechanical contact.
Air knives remove liquids, control the thickness of liquids, dry the liquid coatings, remove foreign particles, cool product surfaces or create a hold down force to assist in the mechanical bonding of materials to the surface. Electrical currents from anti-static bars can also be injected into the exit air knife stream to neutralize the static electricity charge on some surfaces.
In the majority of manufacturing applications for air knives, the air knives are stationary while the product passes through the air velocity air stream. In other circumstances, the product is stationary and the air knives moves (reciprocate or rotate) over the surface of the stationary product. Although there are very few applications where an air knife can actually cut a product (break mechanical bonds between two points), air knives are often the most efficient method of removing or controlling unwanted or foreign substances on any surface.
Most of these solvent based cleaning agents simply evaporated which required no blow off or other drying methods. Although the printed circuit board industry was still in its infancy, it was among the first to initiate the conversion to aqueous and semi-aqueous based parts cleaning systems.
With nearly every existing and all future circuit board factories using the new environmentally friendly cleaning technology, they also needed a new method of drying the p.c. boards following their water-based cleaning to remove the solder fluxes and other contaminants. The trend away from other types of solvent-based parts cleaning to water-based cleaning for all other industries began soon thereafter. Additionally, the conversion to water based inks, paints, coatings, adhesives and other solutions used in all manufacturing sectors has resulted in the need for air knife dryers where none had previously existed. As a result of the Montreal Protocol and the worldwide industry compliance to meet its environmental stewardship mandates, the former niche business of air knives became an industry.
Description of operation
Air knives on a production line commonly range from .25" to 200" (6.3mm to 5080mm) in length with a discharge air slot or holes ranging from .001" to .25" (.025mm to 6.3mm). A stationary air knife configuration can require from one to a dozen air knives depending on the application criteria. Air is blasted through the air knife slots via an air generator, either an industrial blower or air compressor, to deliver the predetermined exit air volume and velocity needed.
There are many application, environmental, efficiency and duty cycle aspects to consider when choosing between compressors and blowers. Compressed air, which is least efficient when used for air knives discharging into free air, allows for use of primary plant air. The piping sizes supplying the air knives can be as little as 1/4" (6.3mm) diameter so they are ideal for confined spaces. Blower powered air knives must be larger in size along with larger diameter supply piping, but the efficiency improvement over compressed air is easily justified with the electrical power cost savings.
Air knife designs today have evolved to where some manufacturers produce a very efficient "teardrop" shape with a .95 coefficient of discharge. These blower powered air knife designs typically have a profile of approximately 3.5" wide x 5.5" tall x any length, but the teardrop profile can range from 1.5" to 10" (140 to 254mm) tall depending on the criteria of the product for which the impact air velocity must be engineered. With construction ranging from .125" (3.2mm) thick aluminum extrusion to 11 gage fabricated stainless steel, air knives can weigh 1 lb. /foot to 25 lbs. /foot (373 grams to 9.3 kg). Depending on the width and speed of the product, the air knife can provide effective blow off performance from .5" to 12" (12.7 to 305mm) or more away from the surface of the product. Round air nozzles of 1" to 4" (25.4 to 102mm) diameter can be effective against surfaces which are up to several feet (1 to 2 meters) from the product surface when engineered for such applications.
Types and Applications
The most common use of air knives is to contain or remove free-standing materials (liquids or solids) from the surface of material. The applications include drying bottles and cans after filling and rinsing, printed circuit boards following the conveyorised wash to remove solder paste and flux, metals castings after automatic machining and many more. They can also deliver heated or cooled air to a surface, or create an invisible air barrier to separate heated or cooled environments from one another in industrial applications such as continuous metal heat treating ovens, cold process or storage areas in food processing or dust containment for the entrance to clean rooms.
There is a variety of uses for air knives in many different industries, applications and environments. The invisible high velocity air streams can be discharged by air knife designs of numerous shapes and sizes. These range from "garage built" devices with a low level of precision to the most exotic metals of construction used in air knives for class 100 clean rooms.
About the Author
The author is associated with IPFonline.
http://www.ipfonline.com is India's No. 1 Industrial Product Finder. The portal is a veritable storehouse of information on industrial products/services.
Which is the best KA-BAR Knife to get?
I wish to purchase a KA-BAR knife, I will be using this as a do everything type knife, the knife will be abused. Given this which is the best KA-BAR to get? The original 1095 steel KA-BAR, the "Next Generation" 440a steel KA-BAR, or the D2 steel KA-BAR. Also for a do everything knife should I get the KA-BAR in a straight blade or partially serrated? I was thinking about just getting the 1095 steel KA-BAR and putting on a few coats of black spray paint, one of my friends (a former Marine) recommended that. Thank You for the help.
a good ol usmc fighting knife in 1095
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