Patent ID: 7921892

Claim:
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 ; 53 a ; 53 b ; 53 c ) 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 ).