for preparing plastic waste composed of different plastics , possibly combined with other materials , for further processing , for example , as additives for construction . a method of the invention comminutes the waste , metals are separated out , the plastic waste is agglomerated , and the agglomerated waste is comminuted further . a device according to the invention for performing the method uses comminution devices , metal separators , and at least one agglomerator . the entire device is completely mobile and equipped with its own power supply .