It is the state of the art cooling technology for air blown film lines.
The control of constant temperature and air flow parameters is providing finished product with stable properties under any environmental conditions. 
Bubble cooling: Bubble cooling is one of the major factors to consider during the extrusion process; the introduction of the internal bubble cooling system (IBC) and outer bubble cooling system (OBC) has allowed considerable progress by precise control of air temperature for cooling the external air ring.

Precise control of the air ring temperature ensures that the geometric shape of the bubble, the “neck”, the “frost line” position and the bubble’s diameter is maintained.