Solid material comminution or disintegration – Processes – With application of fluid or lubricant material
Patent
1987-01-12
1988-03-01
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
With application of fluid or lubricant material
241 20, 241 24, 241 99, B02C 1914
Patent
active
047280450
ABSTRACT:
A method and apparatus for reclaiming reusable resin materials from bottles and other scrap articles each comprising a first low density resin component (e.g., polyethylene) bonded to a second high density resin component (e.g., polyethylene terephthalate); the scrap articles are granulated to form a primary particulate scrap that is air classified to remove paper and film from labels, then flotation separated into a lightweight first resin (PE) material that is dried and air classified for re-use, and a secondary particulate scrap. The secondary scrap is vigorously washed in a hot aqueous medium to disrupt bonds in chips containing both resins, then thoroughly rinsed and again flotation separated into a heavy second resin material that is dried and air cleaned for re-use; there is also a residual low density scrap from the second flotation stage that is returned to the first flotation stage. The flotation separation stages each include a first auger in an apertured-bottom trough positioned near the top of a flotation tank with inlet means depositing particulate scrap and flotation liquid scrap in one end of the trough; the heavy material output is afforded by a second auger in the bottom of the tank, whereas the lightweight material outlet is an overflow weir at one side of the tank.
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Rosenbaum Mark
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