Patent ID: 8574383
Filing Date: 2013-11-05
Classification: B31F,Y10T

Abstract:
1. A method comprising the steps of: gluing a corrugated medium to a liner as the medium and liner are moving downstream through a corrugator to form a corrugated paperboard; wherein the corrugated medium has opposed side edges and the liner has opposed side edges; and the corrugated paperboard has opposed first and second flat sides which face away from one another and define therebetween a thickness of the corrugated paperboard; and sensing with at least one ultrasonic separation sensor a separation of the glued medium and liner from one another; wherein the at least one ultrasonic separation sensor is intermediate the side edges of the corrugated medium and intermediate the side edges of the liner throughout the downstream movement of the corrugated medium and liner; and the at least one ultrasonic separation sensor comprises a sending unit and a receiving unit which are on opposite sides of the corrugated paperboard whereby the first flat side of the corrugated paperboard faces the sending unit and the second flat side of the corrugated paperboard faces the receiving unit so that the corrugated medium and liner pass directly between the sending unit and receiving unit throughout downstream movement of the corrugated paperboard through the corrugator; and wherein the step of sensing comprises producing ultrasonic sensing waves with the sending unit and transmitting the ultrasonic sensing waves to the receiving unit through the corrugated paperboard so that the ultrasonic sensing waves pass through the corrugated medium and liner throughout downstream movement of the corrugated paperboard through the corrugator.