PT99480A -
METHOD FOR MEASURING THICKNESS OF A FIBER WEAVING DURING THEIR TRAINING OPERATION WITHIN THE FORMATION OF THE WEAVING SECTION OF A PAPER MANUFACTURING MACHINE
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METHOD FOR MEASURING THICKNESS OF A FIBER WEAVING DURING THEIR TRAINING OPERATION WITHIN THE FORMATION OF THE WEAVING SECTION OF A PAPER MANUFACTURING MACHINE
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239000003795chemical substances by applicationSubstances0.000claims2
239000000725suspensionSubstances0.000claims1
Classifications
G—PHYSICS
G01—MEASURING; TESTING
G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
G01S15/88—Sonar systems specially adapted for specific applications
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
G01N29/04—Analysing solids
G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
G01N33/34—Paper
G01N33/346—Paper sheets
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N2291/00—Indexing codes associated with group G01N29/00
G01N2291/02—Indexing codes associated with the analysed material
G01N2291/023—Solids
G01N2291/0237—Thin materials, e.g. paper, membranes, thin films
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Physics & Mathematics
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Engineering & Computer Science
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Life Sciences & Earth Sciences
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Chemical & Material Sciences
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Remote Sensing
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Radar, Positioning & Navigation
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General Physics & Mathematics
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Health & Medical Sciences
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Biochemistry
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Acoustics & Sound
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Analytical Chemistry
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General Health & Medical Sciences
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Immunology
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Pathology
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Computer Networks & Wireless Communication
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Food Science & Technology
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Medicinal Chemistry
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Paper
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Length Measuring Devices Characterised By Use Of Acoustic Means
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Claims (4)
1313(jlJytAMfo REIVINDIC A.Ç 0 E S: la. Processo para medir a espessura duma teia de fibras (16) durante a sua operação de formação dentro da secção de formação da teia duma máquina de fabricação de papel, em que se mede a espessura (hx) da teia de fibras (16) com um dispositivo de medição por ultrassons (11) emitindo sinais ultrassonoros que atravessa a teia de fibras (16) no sentido da sua espessura e registando a variação da espessura (hx) da teia de fibras (16) por meio de impulsos reflectidos, caracterizado pelo facto de se efectuar a operação de medição diversas vezes em cada ponto de medição durante um período de medição pré-determinado, se contar o numero de determinações que dão um valor da espessura indicando uma superfície limite particular, na teia de fibras (16), e se determinar um perfil de espessura de formação da teia (TI a Tn) em cada ponto de medição com base em cada espessura medida (hl a hn) e no numero de medições correspondente a cada espessura (hl a hn) . 2a. Processo de acordo com a reivindicação 1, caracterizado pelo facto de se realizar a medição durante um período de tempo compreendido entre 10 e 180 segundos. 3a.A method of measuring the thickness of a web of fibers (16) during its forming operation within the forming section of the web of a papermaking machine, wherein the thickness ( hx) of the web of fibers (16) with an ultrasonic measuring device (11) emitting ultrasonic signals which passes through the web of fibers (16) in the direction of their thickness and recording the variation of the thickness (hx) of the web of fibers ( 16) by means of reflected pulses, characterized in that the measurement operation is carried out several times at each measuring point during a predetermined measuring period, if one counts the number of determinations giving a thickness value indicating a limiting surface (Tl) at each measurement point based on each measured thickness (hl to hn) and on the number of measurements corresponding to the thickness of the web The method according to claim 1, wherein the measurement is carried out for a period of time between 10 and 180 seconds. 3a.Processo de acordo com as reivindicações 1 ou 2, caracterizado pelo facto de se realizar a medição durante um período de tempo determinado por um numero pré-estabelecido de impulsos de medição. 14Method according to claim 1 or 2, characterized in that the measurement is carried out over a period of time determined by a predetermined number of measuring pulses. 144a. Processo de acordo com qualquer das reivindicações 1 a 3, caracterizado pelo facto de se realizar a operação de medição em pontos pré-determinados dentro da secção de formação da teia (4) no sentido do movimento dos arames (2). 5a. Processo de acordo com qualquer das reivindicações anteriores, caracterizado pelo facto de o resultado da medição ser definido com um envelope que passa pelas pontas das extremidades dos segmentos lineares correspondentes ao numero (n) de medições realizadas em cada espessura medida (hl a hn) 6a. Processo de acordo com qualquer das reivindicações anteriores, caracterizado pelo facto de as espessuras medidas (hx) serem divididas em classes pré-determinadas e se contar o numero de medições da espessura pertencentes a cada classe. 7a. Processo de acordo com qualquer das reivindicações anteriores, caracterizado pelo facto de se medir a variação de turbulência na teia de fibras (16), enquanto a teia se encontre ainda sob a forma duma suspensão de fibras. 8a. Processo de acordo com qualquer das reivindicações anteriores, caracterizado pelo facto de se medir a espessura da teia (16) depois de a citada teia já ter sido feltrada. 9a.4a. Method according to one of Claims 1 to 3, characterized in that the measuring operation is performed at predetermined points within the forming section of the web (4) in the direction of movement of the wires (2). 5a. Method according to any one of the preceding claims, characterized in that the result of the measurement is defined with an envelope passing through the ends of the linear segments corresponding to the number (n) of measurements taken at each measured thickness (hl to hn) 6a . Method according to any one of the preceding claims, characterized in that the measured thicknesses (hx) are divided into predetermined classes and the number of thickness measurements belonging to each class is counted. 7a. Method according to any of the preceding claims, characterized in that the variation of turbulence in the web of fibers (16) is measured, while the web is still in the form of a fiber suspension. 8a. Method according to any of the preceding claims, characterized in that the thickness of the web (16) is measured after said web has already been felted. 9a.Processo de acordo com qualquer das reivindicações anteriores, caracterizado pelo facto de se representar o resultado da medição em toda a secção de formação da teia 15Method according to any of the preceding claims, characterized in that the result of the measurement is represented in the entire forming section of the web 15(4) por meio duma representação gráfica que mostra esquematicamente a secção de formação da teia longitudinalmente com uma certa escala e se representar em perspectiva o perfil de formação da teia (TI a Tn) medido em cada ponto particular, da zona em questão, num esboço (17) da secção de formação da teia. 10a. Processo de acordo com a reivindicação 9, caracterizado pelo facto de a variação da turbulência e a espessura da teia de fibras feltrada (16) serem representadas por superfícies separadas entre os valores mínimo e máximo da sua variação num plano ddo fundo do perfil de formação da teia (TI a Tn) em perspectivas. Lisboa, 22 de Novembro de 1991 O Agente Oficial da Propriedade Industrial(4) by means of a graphical representation schematically showing the forming section of the web longitudinally with a certain scale and plotting the web forming profile (TI to Tn) measured at each particular point of the zone in perspective in a (17) of the forming section of the web. 10a. Method according to claim 9, characterized in that the variation of the turbulence and the thickness of the felted fiber web (16) are represented by surfaces spaced between the minimum and maximum values of their variation in a bottom plane of the forming profile of the web (TI to Tn) in perspective. Lisbon, November 22, 1991 The Official Agent of Industrial PropertyARIÉBICQ DA SILVA CARVALHO Agente Oficial de Propriedade Industrial Ruo Marquês de Fronteira, N.e 127 *2·* .1000 LISBOAARIÉBICQ DA SILVA CARVALHO Official Industrial Property Agent Ruo Marquês de Fronteira, N.e 127 * 2 · * .1000 LISBOA
PT9948091A1990-11-131991-11-12
METHOD FOR MEASURING THICKNESS OF A FIBER WEAVING DURING THEIR TRAINING OPERATION WITHIN THE FORMATION OF THE WEAVING SECTION OF A PAPER MANUFACTURING MACHINE
PT99480A
(en)
METHOD FOR MEASURING THICKNESS OF A FIBER WEAVING DURING THEIR TRAINING OPERATION WITHIN THE FORMATION OF THE WEAVING SECTION OF A PAPER MANUFACTURING MACHINE
METHOD FOR MEASURING THICKNESS OF A FIBER WEAVING DURING THEIR TRAINING OPERATION WITHIN THE FORMATION OF THE WEAVING SECTION OF A PAPER MANUFACTURING MACHINE