Patent ID: 8714223

Claim:
A machine for producing a corrugated board, comprising: a first corrugating roller and a second corrugating roller defining a corrugating nip through which a first web material passes; a gluing unit cooperating with said second corrugating roller to apply a glue on crests of said first web material formed in said corrugating nip; a pressing member cooperating with said second corrugating roller to press a second web material against the crests of the first web material; a pressure regulating system to adjust the pressure of the pressing member against said second corrugating roller, said pressure regulating system comprising at least a first pressure chamber associated with a first abutment for said pressing member, said pressure chamber containing a pressure liquid and being provided with a first pressure transducer to detect the pressure inside said first pressure chamber, wherein a control unit causes controlled opening of a first stop valve when the pressure detected by said first pressure transducer is outside a tolerance range around a desired pressure value, the opening of said first stop valve putting the first pressure chamber into fluid connection with a hydraulic circuit for pumping the pressure liquid.