D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
349/29
D21F 7/06 (2006.01) G01B 17/00 (2006.01) G01S 15/88 (2006.01)
Patent
CA 1194208
METHOD AND APPARATUS FOR OBTAINING INFORMATION ABOUT THE SIZE OF A DISCHARGE SLOT IN A HEADBOX Abstract of the Disclosure A method for obtaining information, during opera- tion of a headbox for a paper machine, about the size, at one measuring point at least, of a stock discharge slot which is bounded by two structural members comprising two lip members of the headbox or two partitions arranged be- tween the lip members or one of said lip members and one of said partitions. According to the invention, for every such desired information, an ultrasonic transducer means arranged at the measuring point in the headbox and with a combined transmitter and receiver for ultrasound is arranged to transmit an ultrasonic pulse through the stock between two of said structural members within predetermined surface areas of these located in proximity to said discharge slot. By means of an electronic measuring unit connected to the ultrasonic transducer means, the travel time of ultrasonic pulse from transmitter to receiver is measured and, knowing the sound velocity through the stock at the temperature in question, the size of the discharge slot can be established.
416684
Gowling Lafleur Henderson Llp
Kmw Aktiebolag
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