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[[File:Suction_Drum_Dryers.jpg|thumb|right|Suction Drum Dryers]] | |||
The National brand of reinforced and perforated '''Suction Drum Dryers''' have some of the highest evaporation rates in the industry and have set a new standard in efficient thermal bonding, heat setting and drying of all types of non wovens and fibers. | |||
Multiple drum dryers are ideal for applications requiring high line speed, extended dwell time and in-line temperature profiling for heat setting, thermal bonding or cooling. Drums are either standard perforation for a wide variety of applications or are reinforced structurally for high vacuum, high speed applications. | |||
==Typical Applications== | |||
* Through-air drying (TAD) | |||
* Thermal bonding | |||
* Heat setting | |||
* curing | |||
* Finishing of nonwovens such as spunlaced (hydroentangled) | |||
* Air laid | |||
* Wet laid | |||
* Spun bond (SMS composites) | |||
* Coated and foam impregnated webs | |||
==Advantages== | |||
* Large-size perforated drum | |||
* Highly efficient fans | |||
* Optimized air flow due to specially designed diffusers | |||
* Defined suction zones using close fitting baffles | |||
* Efficient heat exchangers | |||
* Low drying temperatures | |||
* Specially designed heat exchanger tubes to reduce air resistance and minimise the accumulation of dirt | |||
* Large easily removable filters in front of each heat exchanger | |||
* Staggered drum arrangement to reduce floor space and increase the drying surface available for drying | |||
* Electronic control of each drum to achieve perfect synchronization | |||
* Inlet conveyor made from antistatic and lap free material | |||
* Material overfeed possible between drums and between the inlet conveyor and first drum to minimise tension and maximise the flow of air through the slivers | |||
* Automatic cleaning system for drum-guide wheels | |||
* Excellent thermal resistance | |||
* Automatic temperature adjustment | |||
* Exhausts for humid air are placed in a pressure zone with adjustable and automated discharge | |||
* Access for easy cleaning and inspection | |||
* Internal illumination | |||
* Inspection windows to view the inside of the dryer during operation | |||
* Soft air jet used to guarantee reliable passage of material between drums | |||
* Flexing rollers available for use with Super wash processing |