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Difference between revisions of "Air Impingement Dryers"
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[[File: | [[File:Air_Impingement_Dryers.jpg|thumb|200px|right|Air Impingement Dryers]] | ||
The '''Air Impingement Dryers''' are typically utilised in the coating sections of board machines. The systems are custom designed for your process and can be either gas or steam heated. | The '''Air Impingement Dryers''' are typically utilised in the coating sections of board machines. The systems are custom designed for your process and can be either gas or steam heated. | ||
===Operating Principle=== | ===Operating Principle=== | ||
Hot air is made to impinge in a plug flow manner on a moving loosely formed bed of wet feed. Moisture evaporates as the material traverses along the length of the bed and is rendered dry at the discharge end. Humid air is continuously exhausted. The dryer is employed for wet crystals which are very fragile as well for wet performed feeds which are not suitable for the normal belt dryer operation. | Hot air is made to impinge in a plug flow manner on a moving loosely formed bed of wet feed. Moisture evaporates as the material traverses along the length of the bed and is rendered dry at the discharge end. Humid air is continuously exhausted. The dryer is employed for wet crystals which are very fragile as well for wet performed feeds which are not suitable for the normal belt dryer operation. | ||
===Special Features=== | ===Special Features=== | ||
* Suitable for well aerated beds of preformed, crystalline or granular wet feeds. | * Suitable for well aerated beds of preformed, crystalline or granular wet feeds. | ||
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* Continuous operation | * Continuous operation | ||
* Shear sensitive materials can be handled. | * Shear sensitive materials can be handled. | ||
===Applications=== | ===Applications=== | ||
* Menthol Crystals | * Menthol Crystals | ||
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* Pigment | * Pigment | ||
* Organic Crystals | * Organic Crystals | ||
===Modern Air Impingement Technology=== | ===Modern Air Impingement Technology=== | ||
The brand new high velocity hot air impingement dryer is used to dry a water based silicone finish on a spun bonded polyester non woven web that is 210 inches wide. The gas-fired dryer system uses high velocity hot air impingement nozzles mounted beneath the product to apply hot air to the web at a right angle. Hot air impingement breaks through the boundary layer of air that surrounds the moving web and transfers heat to the product to vaporize liquids in the coating or finish. The turbulence created also helps to exhaust vapor from the process, which speeds further drying. Impingement air is exhausted from the dryer through return tubes, which are evenly spaced across the dryer. High velocity hot air impingement is extremely effective in applications where large quantities of water must be removed from a saturated or coated product. | The brand new high velocity hot air impingement dryer is used to dry a water based silicone finish on a spun bonded polyester non woven web that is 210 inches wide. The gas-fired dryer system uses high velocity hot air impingement nozzles mounted beneath the product to apply hot air to the web at a right angle. Hot air impingement breaks through the boundary layer of air that surrounds the moving web and transfers heat to the product to vaporize liquids in the coating or finish. The turbulence created also helps to exhaust vapor from the process, which speeds further drying. Impingement air is exhausted from the dryer through return tubes, which are evenly spaced across the dryer. High velocity hot air impingement is extremely effective in applications where large quantities of water must be removed from a saturated or coated product. | ||