Machine vs. Central Installation Configurations

In broad terms, you have two basic choices about where to place your dryers and drying hoppers.

  • On or near processing machines
  • Remote, central location away from the production floor

Your choice will be largely determined by the type of processing you do.

  • Extrusion, blow molding and long-run injection molders may benefit by locating drying systems on or near processing machines
  • Injection molding operations using multiple materials and frequently changing materials and molds, benefit from remote placement of drying equipment

Drying Systems on or Near Processing Machines for Extrusion, Blow Molding and Long-run Injection Molders

Drying hopper on the machine throat:

  • Minimizes contamination of material
  • May complicate access to hopper for material change, filter maintenance
  • Gravity flow eliminates need for a loader/receiver at the throat
  • Blocks access to the machine throat
  • Requires shut down of process machine for material change
  • Material is typically supplied from Gaylords on the process floor which requires access by pallet jacks and lift trucks

Drying hopper next to the processing machine

  • Requires loader/receiver at machine throat
  • Opens access to machine throat
  • May improve access to hopper for material change, filter maintenance
  • Allows possibility of using a portable dry/convey system
  • Material is typically supplied from Gaylords on the process floor which requires access by pallet jacks and/or lift trucks

Drying hopper on mezzanine above processing machine

  • Gravity flow eliminates need for a loader/receiver at the throat
  • Opens access to machine throat
  • May improve access to hopper for material change, filter maintenance
  • Material supply:
    • Gaylords - requiring access by pallet jacks and/or lift trucks
    • Central vacuum conveying system


Drying Systems Centralized in Remote Location for Injection Molding Operations Using Multiple Materials and Frequently Changing Materials and/or Molds

Central Drying Systems are typically installed with central Vacuum Conveying Systems to maximize energy and labor savings. This plant-wide configuration provides large benefits for the entire operation, but requires fore thought in planning and proper equipment investment.

Central Drying Systems:

  • Use a Central Dryer (Usually a Desiccant Wheel or Desiccant Bed Dryer) to supply -40˚ dew point process air to multiple hoppers
  • You can dry a different material in each hopper or multiple hoppers can dry the same material
  • A process heater/blower at each hopper heats the resin in that hopper to its optimum drying temperature
  • A single hopper can supply material to multiple process machines or a hopper can be dedicated to a single machine
  • Material changes occur at the hopper
  • All dryers and hoppers can be combined at a remote location away from the production area – often on a mezzanine
  • Energy and labor savings are significant
  • Molding machine production time is maximized

Central Conveying Systems:

  • Complement the savings Central Dryer Systems
  • High volume materials can be stored in silos
  • Other materials, supplied in Gaylords or other bulk containers are stored in a central location – off the production floor – typically under the mezzanine where the hoppers are located
  • Pallet jacks and lift trucks can generally be eliminated from the production floor, depending on how you deliver molds to presses
  • Material lines can run underground or overhead from source to destination
  • Material waste is greatly reduced and is eliminated from the production floor
  • Safety hazards are greatly reduced
  • Material sources and destinations can be easily changed with the use of a Quick Selection Manifold

Initial expense is easily justified by these Central System Savings in:

  • Energy costs for drying and material handling
  • Material waste reduction
  • Labor
  • Reduced safety hazards
  • Lift truck operation and repair
  • Dryer and conveying system maintenance
  • Reduction of errors
  • Increased production time


See a webinar comparing press side dryers to Central Drying Systems and other webinars at:
http://www.novatec.com/central-or-stand-alone-dryers.html

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