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Method and device for measuring grammage

The gram weight of thin sheet-like materials is measured by using a dielectric resonator, and microwave excitation and detection of resonant frequency shift are used to solve the harmfulness and inconvenient operation problems of the β-line gram weight determination method, and realize safe and easy-to-operate online gram weight determination. .

Inactive Publication Date: 2006-12-20
OJI PAPER CO LTD
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Problems solved by technology

[0014] However, since the β ray itself is radiation, when the β ray method is used in the measurement of grams, it will inevitably affect the human body.
So it's not easy to operate
In addition, in the event of an emergency, there is the potential to endanger the operator

Method used

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Examples

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Embodiment Construction

[0068] figure 2 One embodiment is schematically shown. (A) is a block diagram, and (B) is an equivalent circuit diagram.

[0069] Through the dielectric resonator (dielectric resonator) 1, there are directionally arranged appropriate microwave rod antennas 2a, 2b, so that it is located in an appropriate position relative to the dielectric resonator, the dielectric resonator 1 can be made to resonate, and the presence of A resonant mode of the electric field vector 20 penetrating the resonator 1 to the outside. In addition, for the sake of simplicity, the illustration of the protective container is omitted in this figure. When the sample-facing surface of the dielectric resonator 1 is circular, the above resonance mode will be the HEM mode; in the case of a square shape, the above resonance mode will be the TM mode, TE mode, or the like. Although the intensity of the electric field vector 20 decreases almost exponentially as it moves away from the dielectric resonator 1, th...

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Abstract

A grammage measuring apparatus includes a dielectric resonator (1) which is arranged only at one surface side of a sample (10); a shielding container (4) with which the dielectric resonator (1) is substantially covered except for a sample measuring surface; a microwave excitation device (6,2a) which causes the dielectric resonator (1) to generate an electric field vector; a detection device (8,2b) which detects transmission energy or reflection energy by the dielectric resonator (1); a storage device (12) in which a calibration curve indicating a resonance frequency shift amount for a grammage is stored; and a data processing device (14) which calculates the grammage of a measuring sample from the calibration curve and measurement result of the resonance frequency shift amount of the measuring sample.

Description

technical field [0001] The present invention relates to the use of microwave resonance to measure the thickness or grammage (per 1m) of sheet-like substances headed by paper, non-woven fabrics and membranes. 2 quality) methods and devices for the determination. Background technique [0002] Thickness and grammage of sheet-like substances, such as paper or film, are one of the most important parameters in terms of product quality. In the manufacturing process, the thickness, or grammage (especially in the case of paper) Bottom) online measurement is essential. [0003] At present, as a method of measuring the grammage on-line in the paper manufacturing process, a β line is generally used. In particular, krypton-85 is mainly used. Beta rays are a type of radiation and are charged particles produced by the beta decay of radioactive isotopes. Beta ray, which is shone on one face of the sample, and the amount passing through it on the other face is detected. The β ray irradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/00G01N9/00G01B15/02
CPCD21G9/0009G01N22/04G01N33/346G01R27/2658
Owner OJI PAPER CO LTD
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