I've invented a machine that converts human excrement back into food. I am calling it "The Garden"... Seriously though, the Japanese have serious space issues, so converting plastic to oil makes sense if the demand for plastic is low and converting the plastic back into plastic is not required, ie the demand for plastic is lower than the demand for oil. Otherwise it makes better sense to simply recycle the plastic back into usable plastic products. "what would be cool is if the oil it created was in turn burned inside the device as furl to heat and convert the rest of the plastic into oil..." I am afraid the only thing you would accomplish in this case is converting alot of plastic into the residues of combusted hydrocarbons, as it will take more than the 1 L of oil converted from the 1 kg of plastic to convert the next 1 kg of plastic into 1 L of oil.