Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1982-09-28
1985-09-03
Alvo, Steve
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162259, 162262, 162263, 162347, 367 96, D21F 102
Patent
active
045390738
ABSTRACT:
A method and apparatus for obtaining information, during operation 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 of two partitions arranged between 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.
REFERENCES:
patent: 3225988 (1965-12-01), Drenning
patent: 3341400 (1967-09-01), Grater
patent: 3442756 (1969-05-01), Lehtinen
patent: 3468756 (1969-09-01), Villa
patent: 3487686 (1970-01-01), Salomon
patent: 3598696 (1971-08-01), Beck
patent: 3839143 (1974-10-01), Suckow
patent: 3923593 (1975-12-01), Verseput
patent: 3947317 (1976-03-01), Stotz et al.
patent: 3994773 (1976-11-01), Wolf et al.
patent: 4021295 (1977-05-01), Schmaeng
patent: 4086130 (1978-04-01), Justus
patent: 4210969 (1980-07-01), Massa
Pages 14-15 of "Valmet News", (vol. 8, No. 3/1981), Antti Lehtinen of Rautpohja, author.
Pages 673-675 of "Measurement of the Thickness of Fiber Suspension on the Fourdrinier Wire with Ultrasonics", (vol. 47:11, 1965), Popper och Tra, author.
Alvo Steve
KMW Aktiebolag
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