DEVICE WITH A CONTROLLABLE COOLING GAS RING WITH A RECTIFICATION UNIT AND AN ADDITIONAL COOLING GAS RING.

摘要

Cooling gas device, comprising a main cooling gas ring (11) with a central axis A for the external cooling of a laminar tube (51) loaded with internal pressure during the manufacture of blown sheets made of thermoplastic synthetic material, comprising a distributor ring housing (12) for cooling gas, and having at least one annular nozzle (15) open inwardly, being located between the distributor ring housing (12) and said at least one nozzle annul (15) a current rectification arrangement (16), which comprises perimeter-distributed circulation channels (18), whose cross-sectional passage can be varied by means of adjustment means (29), and a gas ring of additional cooling (21), which is connected upstream of the main cooling gas ring (11), in the manufacturing direction of the laminar tube (51) and comprising a plurality of other radially oriented circulation channels (24), distributed perimetrically, whose cross-sectional passage can be varied by means of adjustment means (26), characterized in that in each case it acts, in the ring of additional cooling gas (21 ) by varying the cross section, a single actuator (66), through adjustment elements (29, 26), on the cross section of at least one circulation channel (18) in the cooling gas ring main (11) and at the same time on the cross section of at least one of the remaining circulation channels (24).