You have a single material that requires drying and it is required at multiple machines
You have frequent material changes on your machines
You use more material types than you have machines
You have dryer to dryer quality issues when drying the same material
You want to expand, but do not have sufficient space
Still, Portable Dry/Convey units are very popular and several types of dryers are available as Dry/Convey models including:
Desiccant Wheel Dryers
Dual Bed Desiccant Dryers
Compressed Air/Membrane dryers
These models include the Dryer, Drying Hopper with a Vacuum Receiver a Vacuum Pump, all mounted on a frame with casters. A Machine-Mounted Vacuum Loader or Receiver is also supplied to be mounted on the process machine throat. It is not practical to use them for throughputs above about 200 lb./hr. because the unit wi ould simple be too large to push around the plant floor.
Controls have to be designed for both drying and conveying functions. Some microprocessor controls use various codes to describe errors and function buttons for programming parameters. There are also touch screen controls with intuitive icons and keypads for programming functions. With touch screen controls, errors are clearly spelled out in easily understood text messages. There are even controls that include features like over-drying protection for moisture-sensitive resins like nylons and photo-enhanced maintenance and trouble-shooting guides.
Some manufacturers charge extra for things like a warning light or a dew point analyzer, while others include those as standard.