Corrugating machine

A machine for the manufacture of a web of corrugated board (13, 28) which is conveyed in a working direction (15), comprising

• at least one smooth liner (3, 19);
• at least one corrugated medium (7) which has corrugation tips (8) and corrugation troughs (9);
• with the corrugated medium (7) and the at least one liner (3) being assembled by adhesion at least in the vicinity of the corrugation troughs (9);
• and
• a quality assessment device (53;
• 53a;
• 53b;
• 53c) for assessment of the quality of the adhesive bond between the at least one liner (3, 19) and the at least one corrugated medium (7), comprising
• at least one ultrasonic transmitter (62) disposed on one side of the web of corrugated board (13, 28);
• at least one ultrasonic receiver (63) disposed on the opposite side of the web of corrugated board (13, 28) and allocated to the at least one ultrasonic transmitter (62);
• wherein the at least one ultrasonic transmitter (62) and the at least one ultrasonic receiver (63) are located on a straight line (67) which cooperates with the working direction (15) to make an angle (b) to which applies 0°<b<90°, wherein the corrugated medium (7), between each corrugation tip (8) and each corrugation trough (9), possesses a flank (69) with an angle of slope (c) and that b≈c applies;
• a control and evaluation unit (66) which, in a manner for data transmission, is connected to the at least one ultrasonic receiver (63) for evaluation of the signal of the ultrasonic receiver (63) and
• wherein the at least one ultrasonic transmitter (62) and the at least one ultrasonic receiver (63) are disposed on a joint support (56) which is pivotable about horizontal pivoting axis (58).