Unit for cooling a film made of synthetic material

Abstract

The invention relates to a cooling unit ( 2 ) which comprises a cooling tank ( 3 ) at least partially filled with a heat transport coolant, and a cooling drum ( 4 ) at least partially submerged in the cooling tank, the cooling drum including a shell ( 5 ) having two side flanges ( 6 ) which are at least partially perforated such that the inside of the shell is at least partially filled with the heat transport coolant. The cooling tank ( 3 ) comprises at least one heat transport coolant supply opening ( 12 ) situated opposite one of the side flanges ( 6 ) of the shell ( 5 ) and designed to supply the cooling tank with the heat transport coolant.

1 . An assembly for cooling a film in synthetic material, comprising:
 a cooling tank at least partly filled with a heat transfer liquid, and   a cooling drum at least partly immersed in the cooling tank, wherein the cooling drum comprises a shell having two lateral flanges at least partly open-worked so that an inside of the shell is at least partly filled with the heat transfer liquid, and wherein the cooling tank includes at least one mouth for feeding a heat transfer liquid, laid out for feeding the cooling tank with a heat transfer liquid, said at least one heat transfer liquid supply mouth being located facing one of the flanges of the shell.   
     
     
         2 . The assembly according to  claim 1 , further comprising a retention tank and a circuit for circulating a heat transfer liquid comprising at least one heat transfer liquid supply conduit connecting the retention tank to the cooling tank and laid out in order to feed the cooling tank with heat transfer liquid, and at least one return conduit connecting the cooling tank to the retention tank and laid out in order to discharge the heat transfer liquid contained in the cooling tank into the retention tank. 
     
     
         3 . The assembly according to  claim 2 , wherein the retention tank is positioned below the cooling tank. 
     
     
         4 . The assembly according to  claim 2 , further comprising a refrigerating unit laid out in order to cool a heat transfer fluid, and at least one coil positioned in the retention tank and the ends of which are connected to the refrigerating unit so that said heat transfer fluid may circulate in said coil. 
     
     
         5 . The assembly according to  claim 2 , wherein the circuit for circulating a heat transfer liquid includes a pump laid out for feeding with heat transfer liquid at least one supply mouth. 
     
     
         6 . The assembly according to  claim 1 , wherein the inner wall of the shell has surface roughness. 
     
     
         7 . The assembly according to  claim 1 , wherein the inner wall of the shell is provided with a plurality of fins distributed over the surface. 
     
     
         8 . The assembly according to  claim 1 , wherein the shell is made in a metal having a high thermal conductivity coefficient. 
     
     
         9 . The assembly according to  claim 1 , wherein the cooling drum is immersed in the cooling tank so that the liquid level in the cooling tank is located above the axis of rotation of the cooling drum. 
     
     
         10 . The assembly according to  claim 7 , wherein the plurality of fins are regularly distributed over the surface.