an apparatus for the continuously recycling of synthetic plastics material , preferably polyester , has a first receptacle for the material in which movable tools are disposed which comminute and / or mix the material . pre - processed material is conveyed from this receptacle through a vacuum - tightly closable conduit into a second receptacle , the interior of which can be evacuated . within this second receptacle are movable tools for processing the material . the material is conveyed from the second receptacle by means of a screw . another screw is bearingly supported within the channel and the screw volutions of this screw convey the material from the first receptacle into the second receptacle . between the screw volutions of this further screw and the second receptacle there is at least one damming element in the channel , which is disposed in the flow of the conveyed material . a complete vacuum - tightness of the second receptacle and a continuous operation of the apparatus is are thereby enabled .