A method for creating batches of unvulcanized rubber before their mixture in a rubber mixer, including selecting at least one batch for mixing in the mixer, wherein each batch corresponds to a selection of the rubber bales (A I , B I , C I ) which each correspond to a nature of rubber composition having predetermined characteristics, comprising the steps of: providing a supply station where uncured rubber bales (A I , B I , C I ) are supplied from the corresponding rubber natures (A, B, C); selecting unvulcanized rubber bales (A I , B I , C I ) from natures (A, B, C) and in a predetermined proportion corresponding to a selected batch at the supply station ; providing a cutting station comprising at least one blade for cutting at least one bale (A I , B I , C I ) into pieces (A IJ , B IJ , C IJ ); providing a weighing station for weighing the bales (A I , B I , C I ) and the pieces (A IJ , B IJ , C IJ ); providing a storage station for holding the pieces (A IJ , B IJ , C IJ ) between the successive batch creation cycles; weighing the bales (A I , B I , C I ) at the weighing station to obtain the weight of the bales (A I , B I , C I ) ; comparing the weight of the bales (A I , B I , C I ) with the required weight of the batch in which the batch is created in mixing different types and grades of elastomers; and characterised by transporting the bales (A I , B I , C I ) and the pieces (A IJ , B IJ , C IJ ) via feed belt from the supply station to the cutting station , the weighing station , the storage station and the rubber mixer in a sequence determined by the equivalence between the required weight of the batch and (a) the weight of the bales (A I , B I , C I ) or (b) a sum of the weight of the bales (A I , B I , C I ) and a weight of the pieces (A IJ , B IJ , C IJ ). providing a supply station where uncured rubber bales (A I , B I , C I ) are supplied from the corresponding rubber natures (A, B, C); selecting unvulcanized rubber bales (A I , B I , C I ) from natures (A, B, C) and in a predetermined proportion corresponding to a selected batch at the supply station ; providing a cutting station comprising at least one blade for cutting at least one bale (A I , B I , C I ) into pieces (A IJ , B IJ , C IJ ); providing a weighing station for weighing the bales (A I , B I , C I ) and the pieces (A IJ , B IJ , C IJ ); providing a storage station for holding the pieces (A IJ , B IJ , C IJ ) between the successive batch creation cycles; weighing the bales (A I , B I , C I ) at the weighing station to obtain the weight of the bales (A I , B I , C I ) ; comparing the weight of the bales (A I , B I , C I ) with the required weight of the batch in which the batch is created in mixing different types and grades of elastomers; and characterised by transporting the bales (A I , B I , C I ) and the pieces (A IJ , B IJ , C IJ ) via feed belt from the supply station to the cutting station , the weighing station , the storage station and the rubber mixer in a sequence determined by the equivalence between the required weight of the batch and (a) the weight of the bales (A I , B I , C I ) or (b) a sum of the weight of the bales (A I , B I , C I ) and a weight of the pieces (A IJ , B IJ , C IJ ). <EOS>