In the continuous casting of metallic bar products through vertical hollow dies, it is common to employ a cooling jacket about the die to cool the die by means of a coolant such as water introduced into the area enclosed by the cooling jacket so as to come in contact with a cooling sleeve which surrounds and intimately engages the external surface of the die to withdraw heat therefrom. Effective cooling is not only necessary in order to prolong the life of the die but is also necessary to the achievement of satisfactory production speed and to this end, the continuously cast bar must be cooled to a certain degree in order to permit continuous casting without interruption.
The present invention provides improvements in conventional cooling systems such as described above so as to increase the efficiency of cooling of the die as well as the cast product.