(US5017269-A)      Continual carbonisation of waste material mixt from vehicles comprises a) feeding a stream of shredded waste material into a twin screw mixer with an elongated barrel; b) compressing the material by advancing the material through conveying elements on shafts leaving a reduced vol of space in the barrel and so working as a vapour block; c) venting air at 1st vent region upstream from vapour block; d) advancing the material with further decompression in a 2nd vent region; e) recompressing the material in absence of air by passing material through co-rotating and conveying elements on shafts and so forming a mass of moving material filling the barrel acting as a 2nd vapour block; f) venting of lighter volatiles from 2nd vent region; g) advancing material through co-rotating mixing followed by decompression in a 3rd vent region; h) advancing and recompressing material in absence of air in 2nd recompression region leaving a reduced vol of space in barrel acting as a 3rd vapour block; i) venting of heavier volatiles from 3rd vent region; j) discharging a friable particulate char from the mixer. Pref char is cooled to lower its temp below the auto-ignition temp.    USE/ADVANTAGE -   For converting organic waste materials, where useful materials created and energy saved, can largely pay for disposal costs without creating any pollution or landfill problems. @(14pp)    (JP2927849-B2)      Improved method of destructively distilling comminuted organic waste materials and reducing them to useful char prods, which may include a considerable proportion of synthetic plastics material by (a) continuously feeding a stream of the comminuted waste material into one end of a continuous mixer having an axially extending elongate barrel, housing axially extending, co-rotating mixer shafts; (b) contacting the material with material advancing elements on the shafts to advance the material fed into one end of the mixer continuously through a first mixer region; (c) progressively compressing the material in the absence of air in a downstream compressing region by passing it through material conveying and compressing elements on the shafts which leave a relatively reduced volume of space in the barrel for the material to the extent of forming a mass of moving material filling the barrel and functioning as a vapour block, while working the material against itself to create heat in the material which maintains the temp of the material adiabatically at volatile releasing and material carbonising temps, without applying any material external heat to the mixer for transfer to the moving material; (d) venting volatiles from the downstream region; and (e) discharging the carbonised prod from the downstream region.    ADVANTAGE -   The method converts organic waste materials to useful materials in which the materials and heat energy salvaged can, in considerable part, pay for the costs of disposal, without creating pollution and landfill problems.