PURPOSE: To obtain an apparatus for producing a rubber mixture in which cooling effect of a ram-less kneader is improved without modifying the structure of the kneader significantly.

CONSTITUTION: In a first stage, in a ram kneader 1, a master batch is produced and, in a second stage, in a batch-type process, a final mixture is produced in a ram-less kneader 9 without the need for intermediate storage. To improve the cooling in the ram-less kneader 9, the interior of this kneader is supplied with air that has such a degree of dryness that a condensation deposit is precluded. To achieve this, an essentially air tight channel 8 is provided between the two kneaders, with a place being provided in the channel for bottom closure of the ram kneader in a swung-out position of this closure. A rubber mixture having improved quality can be produced without requiring essential improvement of a conventional apparatus.