Cooling ring for cooling a film tube

Abstract

A cooling ring for cooling a film tube (14) in a film blowing installation, includes a cooling gas inlet (18), a distribution system (20) for distributing the cooling gas over the circumference of the film tube (14), a supply gap (28) for guiding the cooling gas in a radial direction towards the film tube, a cooling gas outlet forming an annular gap (34) that surrounds the film tube and is tilted at a tilt angle relative to the radial direction, a flexible adjusting ring (36; 36′) arranged circumferentially in the annular gap, and a collar of individually controllable adjusting elements (44; 44′) for local radial deformation of the adjusting ring, the adjusting ring arranged in engagement with a wall (32; 38′) of the annular gap and forming a limiting wall (42) for the cooling gas flow exiting from the annular gap, the wall extending continuously in circumferential direction.

Dependencies are inferred from the claim text.