Web Dryers Specifications

Help with Web Dryers specifications:

Dryer Type

	Your choices are...
	Straight Pass Dryer		Straight pass or flatbed dryers are used to dry continuous webs or sheets that cannot be wrapped around a cylinder or festoon rack.
	Suction Drum Dryer		Suction drum dryers consist of a series of perforated cylinders or drums with an internal vacuum. Web or sheet materials are held against the drum by the vacuum or suction generated as a fan draws air from the interior of the drum. This suction holds the material to the surface of the drum, permitting air to pass through the material being dried. A portion of the drum at the transfer has no suction and permits the material to transfer to the next drum without interference.
	Predryer		Predryers or preheaters provide initial heating or drying of a material before the unit is passed into a larger dryer. Often, radiant heating dryers are used to pre-dry webs before the material is fed into a hot-air dryer.
	Festoon / Loop Dryer		Festoon or loop dryers are used to heat webs or continuous sheets with minimal contact. The web is supported on bars or threaded onto movable idler rolls that are driven by a conveyor. Festoon dryers are used to dry or cure coated abrasive webs, flocked wall paper or coated fabrics.
	Cylinder / Roll Dryer (External)		Cylinder or roll dryers usually consist of a steam-heated drum with a smooth outer surface around which a moving web or sheet is passed for drying.
	Air Bars / Flotation Dryer		Air bars produce dispersed drying air. Flotation dryers use a series of air bars or louvers to support and gently dry webs of fragile materials.
	Impingement Dryer		Hot air impingement dryers use blasts of hot air to convectively dry moving webs, boards, or other large bulk materials.
	Belt Conveyor Dryer		Conveyor drying uses a perforated belt to transfer feed materials through the dryer. Heated air is either passed under and through, or over and through the belt and product bed before being reheated and re-circulated. Units usually have multiple zones, and may have differing airflow in successive zones. Additionally, each zone may use a different temperature profile and control. Saturated or almost saturated air is exhausted from the dryer via a central exhaust duct.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
	Heat Source / Transfer:
	Your choices are...
	Waste Heat		Waste heat is heat generated or left over from another process.
	Direct / Convection		Hot air or combusted (or heated) gas is directly circulated though the material being dried, to convectively heat and evaporate moisture.
	Combustion		Dryers use heat generated by the combustion of gas, oil, biomass, waste products, or other fuels. The combusted gas may heat the material either directly or indirectly.
	Electric		Electrical resistance heating
	Indirect / Contact / Conduction		Walls, tubes, jackets or discs are heated by steam, gas, thermal oil, or hot air. These heated elements transfer their heat to materials that come in contact with them via conduction. Indirect dryers may be useful when contact with combustible gas or hot air is not desirable due to product or process requirements.
	Radiant / Infrared		Dryers use radiant heat generated by electric or gas-fired infrared heaters. Radiant heat dryers are useful for drying surfaces, flat products or web materials where a clear line of sight can be provided. Straight pass infrared dryers are used to pre-dry web materials before these materials are fed into a conventional, direct, hot dryer.
	Steam		Steam dryers are indirect dryers that use equilibrium or superheated steam. Typically, the steam is passed through tubes (as in a steam tube dryer) or through a jacket or wall passage (as in pan or rotary drum dryers).
	Thermal Oil / Fluid		Thermal oil or fluid is heated and used to indirectly transfer heat to a material through a process wall, jackets, discs or other surfaces.
	RF / Microwave / Dielectric		Radio frequency (RF) generators create an alternating electric field between two electrodes. The material to be heated and dried is conveyed or placed between the electrodes where the alternating energy causes polar molecules in the material to continuously reorient themselves to face opposite poles, much like the way bar magnets behave in an alternating magnetic field. The friction resulting from molecular movement causes the material to rapidly heat throughout its entire mass. Areas in the material with greater moisture content heat up and dry faster.
	Other		Other unlisted or specialized heat sources.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
	Secondary Process Capabilities:
	Your choices are...
	Agglomeration / Granulation		Granules or agglomerates can be formed from powder or fibrous feeds.
	Classification / Screening		Dryers have integral classification or screening capability
	Coating		Dryers allow coating of the material before, during, or after drying.
	Cooling / Freezing		Materials can be cooled or frozen during or after drying.
	Crystallization		Materials such as PET plastic can be crystallized.
	Filtration		Dryers having integral filtration capabilities. Water may be filtered off to reduce the drying time.
	Moisturizing / Humidifying		Dryers can restore a level of moisture to an over-dried and possibly brittle product.
	Preheating		Dryers have an integral preheater or preheating capability. For instance, a slurry could be preheated in a tank before introduction to a drum dryer. This technique reduces the heating demands on the drying unit and increasing line speed.
	Washing / Rinsing		Dryers have an integral washing or rinsing capability. For example, in some pharmaceutical applications, the product may be passed through several rinse and dry cycles to remove liquor.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Back to Top

Performance Specifications

	Operating Temperature		The operating temperature in the dryer.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Process Rate		The linear rate that the web moves through the dryer.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Air Flow		The velocity that air flows through the dryer.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
	Evaporation Rate		The rate that water and other fluids are removed in the dryer.
	Search Logic:		User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Back to Top

Application / Media Selections

	Applications / Materials Processed:
	Your choices are...
	Other		Other unlisted or proprietary applications.
	Pulp and Paper		Equipment is used for drying cellulose feeds, cotton fiber, or pulp for the production of paper, paperboard, fiber and other paper products.
	Sanitary		Equipment is designed for sanitary applications. Dryers are constructed of an easily sterilized material and are designed specifically for hygienic purposes such as medical, pharmaceutical, or food processing applications. Usually, the equipment is certified by a national or international organization (USDA, FDA, etc.), but this is not required.
	Textiles / Nonwovens		Equipment is used to dry woven cloth webs or non-woven mats of nylon, cotton, fiberglass, or other fibrous materials.
	Polymers / Molding		Equipment is suitable for drying plastics, elastomers, rubbers or other polymeric materials in pellet, finish product, or sheet forms.
	Electronics / Semiconductors		Equipment is used in semiconductor or electronic manufacturing (e.g., the drying of wafers after etching and rinsing steps).
	Adhesives / Curing		Equipment is used for drying adhesives or binders. Radiant heat dryers are useful for drying adhesive layers on surfaces, as well as flat products or web materials where a clear line of sight can be provided. Rotary drum and fluidized bed dryers are useful in drying the binders that form and hold together agglomerates.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

Back to Top