What is a foam densifier?

Foam densifier does exactly what it sounds like: it uses one of several methods to remove the air from foam (and keep it that way). Several types of densifiers exist:

  • Hydraulic densifiers use hydraulic pressure to compact foam. A series of rams compress the foam until the memory is gone then extrudes the foam as a dense log. Because hydraulic densifiers don’t use heat, this technology won’t produce smoke or odors and can process various densities of foam at the same time, a particularly appealing feature for community foam recycling programs.               FD3000 EPS cold compactor FD3000 polystyrene compactor FD3000 styrofoam compactor EPS blocks from FD3000
  • Thermal densifiers use heat, melting the foam, and then extrudes the foam in the form of a rope. This material must next be placed in a container so it can be molded into a shape that can be stacked on a pallet. These machines are effective and very easy to operate, but additional labor is required for molding the material. The compression ratio is the best among all densifiers.                              FD25 hot melt densifier FB285 foam densifier FD35 heat melt densifier densifed EPS ingots
  • Screw drive densifiers use an auger to push foam through a chamber, a process that compacts the foam into the form of a log/block. This machine can present some complexities, since the speed and pressure must be adjusted based on the density of the foam being processed. If not adjusted properly, the log will be too light or it will melt in the machine and cause it to stop working.

VITA Recycles is providing hydraulic densifiers and thermal densifiers,

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