JPS60231109A - System for recording and displaying measured quality data of wound-up strip like material - Google Patents

Abstract

PURPOSE:To detect a flaw and to display the same visibly, by continuously or intermittently measuring a plurality of characteristics of a strip like material during a manufacturing process in the lateral direction thereof, and integrating and averaging the measured value to calculate the relation of a measuring point and the measured value. CONSTITUTION:A running strip like material during manufacturing (e.g., paper) is run to the direction shown by the arrow. A header 3 for detecting a basis wt., moisture or ash is run left and right on the frame 2 straddling the strip like material 1. CPU4 obtains a pulse signal from the tacho-generator 6 connected to the motor 5 for driving the head 3 and calculates the position of the head on the frame 2. CPU4 sends a signal to a switching circuit 7 every when the head 3 passes several positions in the lateral direction on the basis of position data to sample the detection output of the head 3 and calculates the average value of each measuring item with respect to length directions L1-Ln from the sampled value to form a graph. By this method, rapid correspondence is performed to initial inferiority and the exclusion of an inferior part can be easily performed as a whole.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for recording and displaying quality measurement data in the width direction of a running and winding strip, such as a filter paper web, in a manufacturing process.

Conventional technology Due to the demand for higher speeds due to higher efficiency in the papermaking process and higher efficiency and higher speeds in the printing process, the paper product format used for printing has decreased in the form of paper products that are cut to a certain size, and the number of rolled products has increased. It's coming. In the case of Teri, each piece can be inspected for quality, so quality can be guaranteed to consumers. However, in the case of rolled products, even if low-quality parts are rolled up inside, they cannot be directly inspected from the outside, so a high level of quality control is required in the manufacturing process.

When manufacturing a strip, defects (such as bumps) continue to occur as long as the cause of the defect remains at the position in the width direction of the strip. Take. Such defects may occur when the product is rolled up.
As a result of defective parts being rolled over and over again, it is possible to check the hardness of the winding by looking at the appearance from the outside, pressing it in the width direction, or striking it. The defect is determined. However, with this defect detection method, by the time the occurrence of a defect is detected, a considerable amount of product has already been rolled up, and a worker has discovered the defect and made adjustments to the manufacturing equipment to correct the defect. Until the results can be confirmed, a considerable amount of products will be processed, and finally defects will be removed.
Until the product becomes stable, a considerable amount of defective products will be produced, resulting in a very large economic loss.

The above-mentioned problems can be greatly improved by configuring a detection technology and feedback system that detects defects during the product flow and feeds them back directly to the upstream side of the manufacturing process. Signal processing schemes have already been proposed. Such previously proposed methods measure characteristic values such as the thickness of the strip at multiple points in the width direction of the strip using a detection head that moves back and forth in the width direction of the strip. This data is weighted and averaged to provide feedback information. In other words, if measurements are taken at multiple points in the width direction of the strip, measurement data will be obtained at regular intervals along multiple lines parallel to the length of the strip, so each measurement data along each line will be For example, the latest data is multiplied by a weight of 1/2, and the previous data is multiplied by 1/2.
A weighted average is calculated by multiplying the data by a weight of 4, multiplying the previous data by a weight of 1/2, and calculating the sum, and control is performed so that this average value is within an allowable range. By taking such a weighted average, noise in the measurement field is removed and the feedback control operation is stabilized. In addition, as a detection head, it is used in the paper manufacturing process to
There is a method that uses a radioactive isotope to measure g/m) and calculates the basis weight by absorption of β rays, and various other methods are known depending on the content of the measurement.

As described above, quality control is carried out in the paper manufacturing process in the paper manufacturing industry, for example, in the manufacture of strips, but in the case of rolled products, unlike handmade products, specific control is carried out over the entire surface of the paper web. Quality assurance is not based on thorough inspections, but rather on the reliability of quality control in the manufacturing process. Theoretically, this type of guarantee method is more efficient than the 100% inspection method for quality assurance, but in reality it is better to have specific quality assurance data for each rolled product. desirable.

□ Purpose The present invention provides a method for recording and displaying quality measurement data of rolled products in the manufacture of strips, particularly in the paper industry.

Component Quality characteristic values such as the thickness and light reflectance of the strip are measured at multiple positions in the width direction of the traveling strip. The characteristic values are cumulatively averaged along each parallel line, and a profile of the distribution of the characteristic values of the strip in the width direction is drawn using this average value, and this profile is used as quality assurance data.

When the quality characteristic value is measured at one point in the width direction of the scanned strip, a variation in the characteristic value is detected along a line passing through that point and parallel to the length direction of the strip. If this characteristic value is integrated over a period of time f and the integration or measurement is intermittent, and divided by the time or number of measurements, the characteristic value in the length direction m
The average is perfect.

If this operation of calculating the average continues during the running period of the strip, the number of samples used to calculate the average will gradually increase, and when the product is stable, this average value will remain constant. converges to the value. In other words, the curve that connects the above average values at multiple points in the width direction of the strip is an average profile obtained by averaging the profile of the quality characteristic value distribution in the width direction of the strip. Although it fluctuates irregularly above and below the average value due to a number of specific external factors, the distribution of quality characteristic values in the width direction is determined by the conditions of the manufacturing equipment itself, and unless an adjustment operation is added or a specific external factor acts, Because it does not change, the quality characteristic value is approximately constant in the length direction, and the average profile described above is data that indicates the quality of the strip over the length direction. It shows the current value of irregular fluctuations in quality characteristic values due to a large number of unspecified external factors that act.

Although the method of the present invention may calculate an average profile that is accumulated and averaged from the start end to the end of the strip, the average profile that is accumulated and averaged for each unit of a certain length or time may be calculated. It may also be possible to display them comprehensively.

Embodiment FIG. 1 shows a device configuration in an embodiment of the present invention. 1
1. Travels in the direction of the arrow with a paper web made of paper. 'C is there. 2 is a frame that straddles this paper web, and the basis weight,
A detection head 3 that detects moisture, ash content, thickness, etc. runs left and right. The basis weight is detected by the β-ray detection method, and although the illustrated head 3 is hidden under the paper web and cannot be seen, there is a β-ray source facing the head 3, and it runs left and right in synchronization with the head 3. .

Reference numeral 4 uses a computer to obtain pulse signals from a tacho generator 6 connected to a motor 5 that drives the head 3 to form data on the position of the head 3 on the frame 2. Based on this position data, the computer 4 sends a signal to the switching circuit 7 to sample the detection output of the detection head 3 every time the detection head 3 passes through several positions in the width direction of the paper web L. Due to the above operation, the detection head 3
scans the paper web 1 in a zigzag pattern as shown in Figure 2,
I L X 12””X 1 n””oX21. X2
2""X2n,...Xkl, Xk2...Xkn
The detection output is sampled at each point. Using this sampling data, the computer 4 generates a longitudinal line Ll.

L2. A weighted average is calculated for each data corresponding to Lk.

To explain this operation for data along LL, when the number of scans n is stored in the memory, the weighted average up to n-1 times is set as Mn-1, and the n-th detection data Xln.
Since the n-th average Mn is calculated, the LL line average value storage position on the memory is taken, and the detected output, for example, the instantaneous value of basis weight, is plotted on the vertical axis to draw a seven-half equalized right-hand complete profile of the base cloth. computer 4
For a certain period of time (or every scanning cycle, the printer 8 is driven to draw the above profile based on the average value data, and the average value data for each line Ll, L2°Lk on the memory is cleared. The above-mentioned average calculation operation is restarted.Furthermore, the computer 4 outputs the detection head output at each point in the width direction obtained in each scan to the CRT display device 9, and displays the paper size in that scan. The profile of the basis weight distribution of the cross section in the width direction is drawn.This allows the operator to know the occurrence of an abnormality.The profile of the basis weight distribution at regular intervals is recorded on the recording paper by shifting it diagonally little by little. As a result, a three-dimensional representation of the basis weight distribution as shown in FIG. 4 can be obtained.

This expression corresponds to the basis weight distribution obtained by significantly compressing the paper web in the longitudinal direction. Therefore, this record is quality assurance data compressed for the entire web of paper.

In addition, if the basis weight exceeds the limit expressed in Figure 4,
-Can r-r = ;= Luna with a cylindrical face? LA Yu AM Elementary School ■
becomes even easier to see. The above-mentioned limit values may be set as upper and lower limits of the allowable tolerance, but they are average values over the length of the drawn profile itself, and the actual values will fluctuate around this average value. Therefore, it is better to take this into account and set the ring slightly inside the allowable tolerance.

In this case, since the fluctuation range of the actual value at each point in time with respect to the average value can be determined empirically, it is sufficient to set the range of fluctuation, that is, within several times the standard deviation. In this way, it can be guaranteed that the percentage of the area that statistically exceeds the tolerance can be guaranteed.

Effects According to the method of the present invention, since defects can be detected in the intermediate process of manufacturing the strip, countermeasures can be taken quickly at an early stage, and abnormal quality can be prevented beforehand. It can provide visible data that represents the quality of the entire product. Moreover, the data is very consistent with the quality of the actual rolled product, and both manufacturers and users are concerned about its quality.
1. (A9) According to method 1, if a single rolled product contains some defective parts, this will be displayed, but this is not a drawback of the present invention. This in itself is a complete quality assurance equivalent to a 100% inspection.

[Brief explanation of drawings]

Fig. 1 is a perspective block diagram showing an example of a device implementing the present invention, Fig. 2 is a plan view showing an arrangement of sampling points, Fig. 3 is a profile of basis weight distribution, and Fig. 4 is an embodiment of the present invention. This is a profile record in an example. l...0. Running paper web, 2, ..., frame, 3
, , Detection head 4 , , Computer 5
, , Detection head drive motor, 6. , , tachogenerator, 7. ,,,switching circuit,8. ,,,Printer, 9...CRT display device〇Representative Patent attorney Kosuke Agata Lk...～...-L2 Ll

Claims (1)

[Claims] fi+ Quality characteristic quantities are measured continuously or intermittently at a plurality of positions in the width direction of a strip running through the manufacturing process, and the measured value of the characteristic quantity is determined for each measurement position. A winding method characterized in that the average profile of the quality characteristic value distribution in the width direction of the strip is depicted by integrating and averaging the calculated average value of the characteristic quantity and recording it with the vertical axis and the measurement position as the horizontal axis. A method for recording and displaying quality measurement data for strips. (2) A method for recording and displaying quality measurement data of a wound strip according to claim 1, wherein the average profile within a certain period is recorded by shifting the position in order for each period.