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Air Knife

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Benefits of Using an Air Knife

July 24, 2014

Most air knives are designed to give maximum efficiency for high velocity air drying and blow off applications. It utilizes compressed air for industrial application. Air knife features a continuous, uninterrupted air slot design. These are used in many different industries. It is commonly use in uncovering underground gas and water lines, buried electrical and communication cabling. It can also be used in exposing the root systems of trees for diagnosis, maintenance or relocation.

For soil contraction, soils vary considerably in strength, density, moisture etc. Air knives will work effectively with all soils but the effectiveness may vary significantly particularly with soil moisture. Air knife works when the compressed air enters at the rear ports then air is entrained at the end point by the compressed air stream that leaves the air knife from a small gap. Then follows the entrained air along the front face that directs the airflow in a perfect straight line at 90 degrees to create a uniform sheet of air along the entire length of the air blade of the air knife then it leaves the air knife at the end point.

Features of an Air Knife

Air knife has a multiple air inlet ports on either the back or ends in a compact design with additional mounting holes in the back. It features an instant on and off with no moving parts, no electricity or explosion hazard. Air knife is also made of a coated aluminum body and hard coated cap. Stainless steel model are available for high temperature and corrosive applications.

Application of Air Knife

  • Air knives are applicable in food. It removes water from product or packaging. It could open pouches in bagging operations and dry food.
  • Air knife can also be applied in chemical products. It helps blow off chemicals or water prior to labeling or packaging as with bottling operations.
  • Air knife can be use in metals. It helps coolant and other liquid removal on process lines from aluminum, steel, brass or other materials. It dry metals prior to other operations such as plating or polishing.
  • It can be use in textile products. It helps in cleaning and drying of clothes or other materials.
  • Air knife can also be applied in printing. It helps in cooling to set some inks , scrap and hold down labels prior to printing.

AN AIR KNIFE

June 24, 2014

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.

It is a pressurized air plenum containing series of holes or continuous slots through which pressurized air exits in laminar flow pattern. The exit air velocity then creates an impact air velocity onto the surface of an object. This allows the surface of a product to alter without any mechanical contact.

For a more detailed explanation on how the air knife works, it goes like this. The compressed air flows through an inlet at the end of a port and into a plenum or housing chamber in an Air Knife. From the plenum chamber, the compressed air leaves the air knife while the surrounding air is sucked into the airflow, adding to the amplification which adheres to the "coanda effect". The airflow then travels down the front of the air knife by turning 90 degrees. The combined and now amplified air flow turns into a uniform or laminar sheet or air. This laminar sheet of air is further converted into reduced energy use, which cools off an application.

Air knives are used for drying, cooling and cleaning applications.  They are used to 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.http://www.stream-tek.com/products/airknives/airknives.php

Most of the uses of air knives involve no movement. The air knives are only stationary while the product passes through the air velocity air stream. In other cases, the product is the one that is stationary and the air knives are the ones rotating. Although there are very few circumstances where an air knife can actually cut mechanical bonds of a product, air knives are often the most efficient method of removing or controlling unwanted or foreign substances on any surface.

ADVANCED AIR KNIFE

May 23, 2014

Air Knife

What is an Air Knife? Air Knife is a tool used to blow off liquid or debris from products. An Air knifes is 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. So, if you are in need of Air Knives, STREAMTEK Corporation is the right choice for you!

STREAMTEK always satisfies clients and offers best quality products. They have over 15 years of experience in compressed air operated products. They offer outstanding product quality, exceptional customer service and safe/secure business transactions. STREAMTEK Corp’s Air Knife Systems utilize compressed air for industrial applications. The curtain like airflow of the Air Knife is used to: dry, clean, remove excess oils, liquids and dust from your application. The Air Knife may also be used for: printing and labeling, part or component cooling, converting and packaging, films and laminating, form and fill, sheet and web materials, bag opening/fill operations, conveying, food processing and paint preparation.

STREAMTEK Corporation has two types of Air Knife, Regular Air Knife and Advanced Air Knife.

The Regular Air Knife performs at a 30:1 air amplification ratio that is less efficient that the Advanced Air Knife. Air consumption is ~3.4 SCFM per inch at 80 PSIG. The Air Knife’s process goes like this:

  1. Compressed air flows through the inlet at the rear (or end) ports, and into a plenum chamber.
  2. As the compressed air stream leaves the Air Knife, the surrounding air is entrained into the airflow for an amplification ratio of 30:1 @ 6" away and adheres to the coanda profile.
  3. The airflow now turns 90 and travels down the front face of the Air Knife. The amplified air stream is a hard-hitting sheet of laminar flow with minimal wind shear, which translated into reduced energy use in blow-off and cooling

The Advanced Air Knife provides the best performance with a 40:1 air amplification ratio, making it the most efficient. Air consumption is ~2.9 SCFM per inch at 80 PSIG. The Advanced Air Knife is normally the best choice due to its lower noise levels and less air consumption than the Regular Air Knife at the same pressure and here’s how it works:

  1. Compressed air flows through the inlet at the rear (or end) ports, and into a plenum chamber.
  2. As the compressed air stream leaves the Air Knife, the surrounding air is entrained into the airflow for an amplification ratio of 30:1 @ 6" away and adheres to the coanda profile.
  3. The airflow now turns 90 and travels down the front face of the Air Knife. The amplified air stream is a hard-hitting sheet of laminar flow with minimal wind shear, which translated into reduced energy use in blow-off and cooling.

 

If you are interested feel free to visit the site http://www.stream-tek.com/products/airknives/super-air-knife-information.php