JP3125708B2 - Paper profile measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a profile measuring apparatus for measuring the quality of paper manufactured by a paper machine or a coating machine, and more particularly to an improvement for measuring the quality in the machine direction (MD) of a paper.

[0002]

2. Description of the Related Art In the paper industry, basis weight, moisture content, paper thickness, gloss, color, and the like are measured as paper quality. Since papermaking machines and coating machines make paper at a speed of about 1000 [m / min], the quality distribution in the paper flow direction (MD) and the quality distribution in the paper width direction (CD) are separated. Recognition is very useful for operation management. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 4-343789, proposed by the present applicant, the quality of the paper being made is measured by scanning a sensor in the paper width direction, and the paper flow direction and paper width are measured. Separation into directional quality distributions has been performed.

FIG. 4 is an explanatory diagram of a measurement state of a sensor in a paper machine. The sensor measures the basis weight and the like, and is mounted on a frame spanned in the paper width direction, and performs reciprocating scanning at a cycle of, for example, about 30 seconds. FIG. 5 is a diagram in which the traveling locus of the sensor is plotted on paper. The traveling locus of the sensor appears zigzag on the paper. The quality distribution in the paper flow direction is called an MD component, and the quality distribution in the paper width direction is called a profile.

FIG. 6 is a diagram for explaining the relationship between the traveling speed of the sensor and the measurement position. The main part of the sensor is manufactured by applying the optical principle, and converts the measurement result into an analog signal at intervals of, for example, several milliseconds. In the profile, measurement points are provided at a constant interval δ in the paper width direction, and at the paper measurement point, an analog signal from the sensor is averaged during traveling at the constant interval δ to obtain a measured value. Thereby, even if the traveling speed of the sensor changes, a constant number of measurement points is always secured. The MD component is monitored by averaging the measured values at all measurement points when the sensor has completed traveling from one end of the paper to the other end. Therefore, if the traveling speed of the sensor is high, the number of analog signal samplings at one measurement point decreases and measurement accuracy deteriorates, and if the traveling speed of the sensor is low, the number of analog signal samplings at one measurement point increases and measurement accuracy is good. Becomes

[0005]

However, the accuracy of the measurement value at one measurement point depends on the traveling speed of the sensor.
In order to increase the number of analog signal samples at the measurement point, it is necessary to reduce the traveling speed of the sensor. Then, although the profile can be measured with high accuracy, MD
As for the component, there has been a problem that the interval between measurement points in the paper flow direction increases, so that the high-frequency component of the fluctuation of the MD component cannot be measured properly. Therefore, in order to measure the MD component up to the high-frequency component, it is necessary to stop scanning in the paper width direction and perform a fixed point measurement, and there is a problem that the profile cannot be measured during the fixed point measurement period. .

At the averaging timing of measurement points at a constant interval δ, positional accuracy on paper is important. Therefore, even when the traveling speed of the sensor is increased, it is necessary to ensure a certain positional accuracy, and it is difficult to extremely shorten the measurement point interval δ. Therefore, this is an obstacle to increasing the number of profile measurement points. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a paper profile measuring apparatus capable of successfully measuring a high frequency component of a variation in an MD component and increasing the number of profile measurement points.

[0007]

SUMMARY OF THE INVENTION The present invention, which achieves the above object, comprises a sensor body 10 for scanning in the paper width direction to measure the basis weight, moisture content, etc. of paper, and an analog output from the sensor body. In a paper profile measuring apparatus having an A / D converter 20 for converting a signal into a raw measurement value at a predetermined sampling interval and a sensor position detecting means 30 for detecting the position of the sensor body in the paper width direction, A diagnostic measurement data acquisition unit 60 for averaging raw measurement values measured by the D converter at a predetermined diagnostic measurement timing to obtain diagnostic measurement data; and determining the position of the sensor body at the diagnostic measurement timing as the sensor position. A diagnostic position information acquisition unit that reads from the detection unit, and a sensor body that acquires the diagnostic measurement data obtained by the diagnostic measurement data acquisition unit by the diagnostic position information acquisition unit It is characterized in that a diagnostic profile section 80 for recording with a fixed position.

According to the configuration of the present invention, the diagnostic measurement data acquiring section averages the raw measurement values at a predetermined diagnostic measurement timing to obtain diagnostic measurement data. The diagnostic position information acquisition unit reads the position of the sensor body at the diagnostic measurement timing from the sensor position detecting means. The diagnostic profile unit records the diagnostic measurement data obtained by the diagnostic measurement data acquisition unit together with the sensor body measurement position obtained by the diagnostic position information acquisition unit. As a result, since the diagnostic measurement data is obtained at regular time intervals, when the traveling speed of the sensor body is slow, the interval between the measurement points in the paper width direction is shortened and the profile becomes dense, and the paper making speed is reduced. When the distance is constant, the interval between the measurement points in the paper flow direction is constant, and the measured value variation in the paper flow direction can be accurately obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In the figure, a sensor body 10 scans in the paper width direction to measure the basis weight, moisture content, and the like of the paper. A / D converter 2
0 converts the analog signal output from the sensor body 10 into a raw measurement value at a predetermined sampling interval. The sampling interval is set so that the sensor 10 can output a stable measurement value, and is set to several milliseconds, for example. The sensor position detector 30 detects the position of the sensor main body 10 in the paper width direction.

[0010] The standard measurement data acquisition section 40 converts the raw measurement value measured by the A / D converter 20 into a sensor position detection section 30.
Averaging is performed at the timing of the standard measurement position sent from the computer to obtain standard measurement data. The standard profile unit 50 records the standard measurement data obtained by the standard measurement data acquisition unit 40 together with the standard measurement position. Here, as described with reference to FIG. 6, since the standard measurement position is determined by the constant interval δ in the paper width direction, the integrating / averaging unit 42 sequentially adds the raw measurement values sent from the A / D converter 20. Then, the standard measurement data at the standard measurement point 44 is obtained at regular intervals δ in the paper width direction. At this time, the integrated value of the integrating and averaging unit 42 is reset at regular intervals δ in the paper width direction.

The diagnostic measurement data obtaining section 60 averages the raw measurement values measured by the A / D converter 20 at a predetermined diagnostic measurement timing to obtain diagnostic measurement data. The diagnostic position information acquiring unit 70 determines the position L [mm] of the sensor body 10 at the diagnostic measurement timing by using the sensor position detecting unit 30.
Read from. The diagnostic profile unit 80 records the diagnostic measurement data obtained by the diagnostic measurement data acquisition unit 60 together with the sensor main body measurement position L [mm] obtained by the diagnostic position information acquisition unit 70. Here, the integrating / averaging unit 62 sets the A / D
The raw measurement values sent from the converter 20 are sequentially added to obtain diagnostic measurement data at the standard measurement point 64 at each diagnostic measurement timing. At this time, the integrated value of the integrating / averaging unit 62 is reset at each diagnostic measurement timing.

The operation of the apparatus having the above-mentioned configuration will be described below. In the standard profile section 50, the number of the measured values XXXX is fixed in the paper width direction because the fixed interval δ in the paper width direction is fixed. On the other hand, in the diagnostic profile section 80, the diagnostic measurement position L [mm] changes because the diagnostic measurement timing is determined only and depends on the traveling speed of the sensor body 10. Accordingly, the number of measured values YYYY at the diagnostic measurement points varies in the paper width direction.

FIG. 2 is an explanatory view of a standard measurement position and a diagnostic measurement position when the traveling speed of the sensor body is high. In the standard profile section 50, measurement points are set at a constant interval δ in the paper width direction.
”” Is determined. On the other hand, in the diagnostic profile unit 80, the measurement points “●” are determined at the diagnostic measurement timing t. As a result, the number of measurement points of the standard profile unit 50 is larger than that of the diagnostic profile unit 80. This is more than the number of measurement points.

FIG. 3 is an explanatory view of a standard measurement position and a diagnostic measurement position when the traveling speed of the sensor body is low. Since the traveling speed of the sensor body is slow, the moving distance in the paper flow direction with respect to the constant interval δ in the paper width direction is increasing. However, in the diagnostic profile section 80, since the measurement point "●" is determined at the diagnostic measurement timing t, the interval between the diagnostic measurement points in the paper flow direction does not change. Therefore, the diagnostic profile unit 8
That is, the number of measurement points of 0 is larger than the number of measurement points of the standard profile unit 50.

[0015]

As described above, according to the first aspect of the present invention, the diagnostic measurement data acquisition unit 60 averages raw measurement values at predetermined diagnostic measurement timing to obtain diagnostic measurement data, Since the measurement position of the sensor main body 10 of the position information acquisition unit 70 is recorded in the diagnostic profile unit 80, when the traveling speed of the sensor main body is slow, the interval between the measurement points in the paper width direction is shortened, and the profile is reduced. In addition to the fineness, when the papermaking speed is constant, the interval between the measurement points in the paper flow direction becomes constant, and there is an effect that the measured value variation in the paper flow direction can be accurately obtained.

According to the second aspect of the present invention, the standard measurement data acquisition unit 40 and the standard profile unit 50 are provided in addition to the diagnostic measurement data acquisition unit 60 and the diagnosis profile unit 80. By obtaining the measured value in the paper width direction and the measured value in the paper flow direction from the diagnostic profile unit 80, there is an effect that both the measured values in the paper width direction and the paper flow direction can be simultaneously and accurately obtained. .

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a standard measurement position and a diagnostic measurement position when the traveling speed of the sensor body is high.

FIG. 3 is an explanatory diagram of a standard measurement position and a diagnostic measurement position when the traveling speed of the sensor body is low.

FIG. 4 is an explanatory diagram of a measurement state of a sensor in a paper machine.

FIG. 5 is a diagram in which a traveling locus of a sensor is plotted on paper.

FIG. 6 is a diagram illustrating a relationship between a traveling speed of a sensor and a measurement position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Sensor main body 20 A / D converter 30 Sensor position detection part 60 Diagnostic measurement data acquisition part 70 Diagnostic position information acquisition part 80 Diagnostic profile part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D21F 1/00-13/12 G01B 21/08 G01B 21/20

Claims (3)

(57) [Claims] 1. A sensor body (10) that scans in the paper width direction to measure the basis weight, moisture content, etc. of paper, and converts an analog signal output from the sensor body into raw measurement values at a predetermined sampling interval. And a sensor position detecting means (30) for detecting the position of the sensor main body in the paper width direction, wherein the profile measured by the A / D converter is provided. A diagnostic measurement data acquisition unit (60) for averaging the measured values at a predetermined diagnostic measurement timing to obtain diagnostic measurement data; and a diagnostic position for reading the position of the sensor body at the diagnostic measurement timing from the sensor position detecting means. An information acquisition unit (70), and a diagnostic recording unit that records the diagnostic measurement data obtained by the diagnostic measurement data acquisition unit together with the sensor body measurement position obtained by the diagnostic position information acquisition unit. Paper profile measuring apparatus for profile section (80), characterized in that the provided. 2. A sensor body (10) for scanning the paper width direction to measure the basis weight, moisture content, etc. of the paper, and converting an analog signal output from the sensor body to a raw measurement value at a predetermined sampling interval. A / D converter (20), a sensor position detecting means (30) for detecting the position of the sensor body in the paper width direction, and a raw measurement value measured by the A / D converter. A standard measurement data acquisition unit (40) for averaging the standard measurement data at the timing of the standard measurement position sent from the server, and a standard profile for recording the standard measurement data obtained by the standard measurement data acquisition unit together with the standard measurement position In the paper profile measuring apparatus having the section (50), the raw measurement value measured by the A / D converter is averaged at a predetermined diagnostic measurement timing to obtain diagnostic measurement data. A diagnostic measurement data acquisition unit (60) to be obtained; a diagnostic position information acquisition unit (70) that reads the position of the sensor body at the diagnostic measurement timing from the sensor position detection unit; and a diagnosis obtained by the diagnostic measurement data acquisition unit. And a diagnostic profile section (80) for recording the measurement data together with the sensor body measurement position obtained by the diagnostic position information acquisition section. 3. A measurement value variation in a paper flow direction is extracted from the diagnostic measurement data recorded in the diagnostic profile section, and a measured value distribution in a paper width direction is extracted from the diagnostic measurement data recorded in the standard profile section. 3. The paper profile measuring apparatus according to claim 2, wherein the paper profile is extracted.