Device for pretreating plastic waste before recycling
AssigneesInstitut Francais du Petrole, Lutz et Kempp Industries (L.K.I.)
InventorsOlivier Krempp, Andre Renot
Life of this patent
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Abstract
A pretreating plastic waste device including a tank containing a liquid to which the plastic waste is introduced, a washing pump, a dripping drum, and a dewatering device comprising a press-screw adapted for separating the washed waste from the washing liquid and a drying drum fed by a hot air blower, and a filtration vat. A programmable controller receiving signals from various level and temperature sensors and various working parameters allows total control, at all stages, of the waste pretreatment cycle. The programmable controller is associated with a screen for displaying error messages and a control desk for allowing direct selective intervention at the level of the concerned elements.
Claims12
A device for pretreating plastic waste adapted to deliver washed and dried plastic waste for recycling, the device comprising:
- a tank filled with liquid into which the plastic waste to be treated is introduced, means including
- a washing pump for washing the plastic waste with liquid,
- a separating system communicating with the washing means arranged for separating the washed plastic waste from the liquid of said washing pump, said separating system including a dripping drum, and
- means for compressively dewatering the separated washed plastic waste comprising an accumulation channel with a substantially constant passageway including a cylindrical wall, a press-screw arranged along a portion of said accumulation channel, at least one radial opening arranged in the cylindrical wall of the accumulation channel, at least one braking part pivotably mounted with respect to said accumulator channel for radially engaging in said at least one radial opening so as to be displaceable from a first position away from the press-screw and a second position near said press-screw, and elastic means connected with said at least one braking part for continuously exerting thereon an elastic force for moving said at least one braking part into said second position and restricting said passageway, whereby an elastic braking force is continuously exerted on the washed plastic waste in said accumulation channel.
Dependencies are inferred from the claim text.