A rubber mixture production line for performing multi-pass mixing sequences, the production line is characterized in that it's comprising: at least a first mixing line comprising: - at least one internal mixer that performs a masterbatch manufacturing process; - a hot mixing line disposed downstream of the internal mixer and comprising at least one twin-screw mixing machine (Bxc) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the internal mixer; - a transfer belt installation disposed downstream of the hot mixing line for controlling a temperature and an addition of water in a rubber mixture exiting the hot mixing line; - a batch-off installation disposed downstream of the transfer belt installation for performing an anti-sticking and cooling process of the rubber mixture exiting the transfer belt installation; and - an end-of-line installation disposed downstream of the batch-off installation that performs one or more end-of-line processes on the rubber mixture; and at least one second mixing line, comprising: - a twin-screw mixing machine (B 1) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the first line; - a transfer belt installation (TT') disposed downstream of the twin-screw mixing machine (B 1) for controlling a temperature and an addition of water in a rubber mixture exiting the twin-screw mixing machine (B 1); - a cold mixing line disposed downstream of the transfer belt installation (TT') and comprising at least one twin-screw mixing machine (B XF) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the transfer belt installation (TT'); - a batch-off installation (BO') disposed downstream of the cold mixing line that performs an anti-sticking and cooling process of the rubber mixture leaving the cold mixing line; and - an end-of-line installation (FL') disposed downstream of the batch-off installation that performs one or more end-of-line processes of the rubber mixture; wherein the second line performs a final mixing process during a last pass of a multi-pass rubber mixing sequence. - at least one internal mixer that performs a masterbatch manufacturing process; - a hot mixing line disposed downstream of the internal mixer and comprising at least one twin-screw mixing machine (Bxc) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the internal mixer; - a transfer belt installation disposed downstream of the hot mixing line for controlling a temperature and an addition of water in a rubber mixture exiting the hot mixing line; - a batch-off installation disposed downstream of the transfer belt installation for performing an anti-sticking and cooling process of the rubber mixture exiting the transfer belt installation; and - an end-of-line installation disposed downstream of the batch-off installation that performs one or more end-of-line processes on the rubber mixture; and at least one second mixing line, comprising: - a twin-screw mixing machine (B 1) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the first line; - a transfer belt installation (TT') disposed downstream of the twin-screw mixing machine (B 1) for controlling a temperature and an addition of water in a rubber mixture exiting the twin-screw mixing machine (B 1); - a cold mixing line disposed downstream of the transfer belt installation (TT') and comprising at least one twin-screw mixing machine (B XF) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the transfer belt installation (TT'); - a batch-off installation (BO') disposed downstream of the cold mixing line that performs an anti-sticking and cooling process of the rubber mixture leaving the cold mixing line; and - an end-of-line installation (FL') disposed downstream of the batch-off installation that performs one or more end-of-line processes of the rubber mixture; - a twin-screw mixing machine (B 1) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the first line; - a transfer belt installation (TT') disposed downstream of the twin-screw mixing machine (B 1) for controlling a temperature and an addition of water in a rubber mixture exiting the twin-screw mixing machine (B 1); - a cold mixing line disposed downstream of the transfer belt installation (TT') and comprising at least one twin-screw mixing machine (B XF) including a converging conical twin-screw mixer that performs a mixing process of the rubber mixture exiting the transfer belt installation (TT'); - a batch-off installation (BO') disposed downstream of the cold mixing line that performs an anti-sticking and cooling process of the rubber mixture leaving the cold mixing line; and - an end-of-line installation (FL') disposed downstream of the batch-off installation that performs one or more end-of-line processes of the rubber mixture; wherein the second line performs a final mixing process during a last pass of a multi-pass rubber mixing sequence.