Vacuum Dryers VBD


  2. equipment
  3. dehumidification and drying

Maguire Vacuum Dryers are proven to dry all types of polymers in a fraction of the time and with up to 85% less energy than desiccant dryers...and leave it to Maguire to improve on a great thing:

  • Improved design obsoletes moving canisters and minimizes moving parts.
  • Continuous batch drying process.
  • -40° dew point air is constantly bled into vacuum and retention hoppers.
  • Vertical design minimizes footprint.
  • No heat loss is guaranteed with double-insulation on all vessels.
  • Reduced Maintenance - no desiccant to change - no filters to clean.
  • Faster drying improves production planning.
  • "No stress" material drying - means no material degradation.
  • Process temperatures up to 350°F. (175°C)
  • Vacuum take-off or gravity feed material discharge available.
  • Backed by same 5-year warranty as all Maguire products.

How the VBD-150 Dryer Works:VBD Vacuum Dryers utilize a 3-stage continuous batch drying process

Stage 1:
Material in the heating hopper is brought to set point by means of a centrifugal blower through a heating element. The requested heating temperature is adjusted on the control panel.
Stage 2:
Upon reaching the desired set point, heated material is discharged from the heating hopper into the vacuum vessel. The vacuum is brought to 700mm Hg and held to a 20mm Hg differential for the set cycle time. The vacuum cycle typically lasts about 15 - 20 minutes so you have ready-to-process material in 30 - 40 minutes.
Stage 3:

The dried material is discharged into an insulated retention / take-off hopper for consumption. A positive pressure heated dry air purge is maintained on the material.

VBD Controller

  • Simple is better - no confusing icons - only two screens to monitor
  • The controller is a Motorola micro-processor
  • Four buttons provide access for setting operation mode, adjusting dryer parameters and many additional program functions.
  • Alarms are shown on the display and signaled by an alarm light and horn with silence function.
  • Reports can be generated via a USB port to either a memory stick or printer.
  • Program updates via flash memory using a standard USB memory device.

Energy usage comparison with dual-desiccant bed dryer
Dual Bed Dryer vs. Maguire VBD-1000 Vacuum Dryer

Drying 1000 lb/hr (454 kg/hour) of nylon at 170°F ( 77°C):
- Electrical consumption only
- Compressed air generation electrical requirement for 9.8 SCFM
TOTAL True Energy Consumption @ 170°F (77°C)		 Dual Bed
watts/Kg/hr
81.8

81.8		 VBD
watts/Kg/hr
30.8
8.1 
38.9
VBD ENERGY SAVINGS 53%
Drying 1000 lb/hr (454 kg/hour) of Polycarbonate at 250°F ( 121°C):
Dual Bed VBD
Total True Energy Consumption @ 250°F (121°C) 120.3 53.4
VBD ENERGY SAVINGS 56%

 

Note: "compressed air generation electrical requirement" is the amount
of electrical energy required to make the amount of compressed air that
the unit consumes. It is based on 4 SCFM requiring 1.0 HP, and 1.0 HP
being 746 watts of power.