JP2013119681A - Apparatus for controlling expansion/contraction state of paper in paper machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper machine in which the accurate expansion/contraction behavior of roll paper produced by the paper machine is measured so that papermaking conditions can be automatically controlled in accordance with a measured value.SOLUTION: In an apparatus for controlling the expansion/contraction state of paper in a paper machine, images of a plurality of print marks regularly formed on roll paper are captured in a part subsequent to a calender part of the paper machine. The captured images are compared with a reference image stored in advance, and thereby the expansion/contraction behavior of the roll paper is measured in the flow direction and the width direction. In order to maintain the expansion/contraction behavior of the roll paper in a state of statistical control, a dry cylinder temperature, the draw of size rolls, and the arrangement position, arrangement angle, and curvature amount of an expander roll can be automatically controlled.

Description

  The present invention relates to a paper machine with a paper inserted in order to determine whether it is genuine or counterfeit in banknotes, stock certificates, securities such as bonds, various certificates and important documents. The paper expansion and contraction behavior of the paper machine that automatically controls the expansion and contraction behavior of the paper by adjusting the drying conditions of the dry part based on the measurement results is measured continuously. The present invention relates to a state management device.

  For paper with anti-counterfeiting technology, such as paper making, roll paper is made by a paper machine and cut into a sheet of a predetermined size before proceeding to the printing process. In order to apply a pattern to the prevention technology by a printing process, it is necessary to perform quality control such as expansion and contraction behavior of the paper and to manufacture a stable paper.

  The method of adjusting the expansion / contraction behavior of the paper is to observe the position of the pattern such as a squeeze applied to the paper being made, and check the expansion / contraction behavior of the paper depending on whether the pattern position has shifted. In general, the operator adjusts the dry part at the operator's discretion to control the expansion / contraction behavior of the paper.

  As a method of mechanically measuring the expansion and contraction behavior of paper during papermaking, the present applicant forms a plurality of ring-type crease marks in the longitudinal and transverse directions of the paper, captures a transmissive image of the crease mark with a CCD camera, and transmits Is converted into digital data, and a method of measuring the expansion / contraction behavior of the paper by calculating and calculating the vertical center coordinate and the horizontal center coordinate is disclosed (for example, see Patent Document 1). .

  In addition, as a method for controlling the expansion and contraction behavior of the paper on the paper machine, the present applicant, for example, uses a mark detector and a pulse generator as a means for measuring the dimension in the paper flow direction during papermaking between the dry part outlet and the calendar part. It is provided so that it is located on the paper surface, measures the dimension in the paper flow direction, compares it with a reference value entered in advance, determines whether it is within the standard, and changes the speed of the dry cylinder based on the determination result Control the expansion and contraction of the flow direction. In the width direction, the dimensions are measured with an image sensor camera, and in the same way as the flow direction, it is compared with a reference value input in advance to determine whether it is within the standard. Based on the determination result, the canvas A method for automatically controlling expansion and contraction in the paper flow direction and width direction by adjusting the tension of the paper is disclosed (for example, see Patent Document 2).

Japanese Patent No. 3629493 Japanese Patent Publication No. 5-30741

  However, in the invention of Patent Document 1, a transmission image of a plurality of ring-shaped penetration marks formed on a sheet is captured under transmitted light by a CCD camera, and an accurate processing of the expansion and contraction of the sheet is measured by performing arithmetic processing. However, depending on the installation position of the device, the captured image itself is affected by the unevenness of the paper texture, so there is a possibility that the correlation between the finally calculated data and the web data is not obtained. There was a problem left.

  Furthermore, Patent Document 1 discloses the measurement of the expansion / contraction behavior of the paper, but does not disclose any change in the papermaking conditions in accordance with the expansion / contraction behavior, and as a result, is the same as the conventional adjustment method. In addition, it is necessary to control the expansion / contraction state of the paper, such as adjustment of dry part conditions, by a technique that requires the skill of the operator, so that a problem remains.

  Further, in the invention of Patent Document 2, since the measurement unit in the paper flow direction and the width direction is installed between the dry part and the calendar part, the state of the winding paper generated by the mechanical load applied to the paper layer of the calendar part Since the speed of the dry cylinder and the canvas tension are adjusted under different conditions, there is a possibility that adjustment according to the expansion / contraction behavior of the web may not be possible, and there is room for improvement.

  In view of the above-described problems, the present invention inputs a print mark position formed in synchronization with a crease pattern on a sheet by a measuring device installed at a position immediately before winding after the calendar part, The print mark position in the flow direction and width direction of the paper and whether or not it is within the pre-stored allowable range, and the temperature of the dry cylinder, the size roll draw and the expander roll installed in combination with the judgment result By performing automatic control, the expansion and contraction behavior of the paper is controlled without requiring skill of the operator.

  The paper expansion / contraction state management device in the paper machine of the present invention is a device that automatically performs expansion / contraction adjustment according to the expansion / contraction of the paper produced on the paper machine, and is used for operating the paper expansion / contraction state management device described above. A print mark measurement mechanism that acquires the print mark image above, a determination mechanism that calculates the paper expansion / contraction state from the acquired print mark image and determines whether it is in the statistical management state, and a size roll when not in the statistical management state And a sheet expansion / contraction state management device having at least a control mechanism for giving an instruction to the dry cylinder and the expander roll and an adjustment mechanism for changing the setting of each device in response to the instruction from the control mechanism.

  Further, the print mark measuring mechanism in the paper expansion / contraction state management device of the present invention includes a light projecting unit that illuminates the paper to obtain a print mark image attached to the paper made on the paper machine, and a print by a CCD camera. It is a sheet expansion / contraction state management device having a light receiving unit that acquires a mark image, an image input unit that inputs the acquired print mark image, and a timing data acquisition unit that measures a print mark interval.

  Further, the determination mechanism in the paper expansion / contraction state management apparatus of the present invention includes a calculation unit that calculates a paper expansion / contraction state based on the print mark image and timing data obtained by the measurement mechanism, and paper expansion / contraction information obtained by the calculation unit. Paper having a storage unit for accumulating, a determination unit for determining whether the paper expansion / contraction state is a statistical management state from information stored in the storage unit, and an alarm unit for sounding an alarm when the paper expansion / contraction exceeds an allowable range It is an expansion / contraction state management device.

  Further, the control mechanism in the paper expansion / contraction state management device of the present invention includes a control unit that determines the selection and adjustment range of the device to be adjusted from the information obtained by the determination unit, and an instruction unit that instructs each machine of information on the control unit. It is characterized by being a sheet expansion / contraction state management device.

  Further, the adjustment mechanism in the paper expansion / contraction state management apparatus of the present invention is an adjustment function for adjusting the size roll draw, the temperature of the dry cylinder, the arrangement angle and arrangement position of the expander roll, and the amount of bending according to the instruction received from the control mechanism. It is characterized by being a paper expansion / contraction state management device.

  By using the paper expansion / contraction state management device in the paper machine of the present invention, it is possible to measure the expansion / contraction behavior of the paper closer to the state of the web and to automatically control the papermaking conditions, and to make a stable paper Can do.

  In addition, by using the paper expansion / contraction state management device in the paper machine of the present invention, adjustment of dry part conditions and canvas tension that have been handled by skilled techniques such as confirmation of paper expansion / contraction behavior by the operator and changes in paper production conditions, etc. Since there is no need to make adjustments and the like, in terms of cost, it is possible to reduce paper loss during paper adjustment by reducing the number of workers by reducing the amount of work and allocating time for width adjustment to other paper adjustment work. In terms of quality, it is possible to reduce quality variations caused by skill differences among workers.

  In addition, by changing the condition setting of the dry part from adjusting the canvas tension to adjusting the temperature of the dry cylinder, it prevents meandering in the paper width direction due to loose canvas tension, increasing the measurement accuracy of the print mark position, It is possible to improve workability in the next cutting process.

The figure which shows the whole paper machine which has the paper expansion / contraction state management device Enlarged view of the print mark measurement mechanism Enlarged view of paper with print marks Enlarged view showing the projector and detector in the print mark measurement mechanism The figure which shows the example by which multiple detection parts are arrange | positioned Block diagram of a paper expansion / contraction state management device of the present invention An enlarged view showing an example of a reference print mark image and a print mark image at the time of abnormality confirmation The figure which shows the example which performs necessity judgment by a print mark position Enlarged view showing the dry cylinder Enlarged view showing the expander roll Flowchart diagram illustrating an example of a process for managing the expansion and contraction behavior of paper

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below, and includes various other embodiments within the scope of the technical idea described in the scope of claims.

  FIG. 1 is a diagram showing an entire long web paper machine having a paper expansion / contraction state management device of the present invention. The long web paper machine is roughly divided into a preparation unit (5), a wire unit (4), a press unit ( 2) It is composed of a drying section (3a, 3b), a calendar section (7), and a reel section (6), and the preparation section (5) is free of large foreign matter such as entanglement or clumps of paper stock. It has the function of removing and dispersing the fibers.

  Next, about a wire part (4), it forms in a sheet form, promoting the basic weight balance of a width direction and dispersion | distribution of a fiber, and it dehydrates by applying a pressure to a wet paper in a press part (2). The dehydrated wet paper is dried in the drying section (3a and 3b) and the paper expansion / contraction behavior is adjusted.

  An expander roll (8) is provided between the press section (2) and the drying section (3a), and the expander roll (8) is capable of generating paper wrinkles and folds generated in the drying section (3a). Used to prevent. The expander roll has a curved shape, and the twist or the like of the paper can be adjusted by changing the arrangement angle, the arrangement position, and the bending amount of the expander roll with respect to the paper flow method.

  For the drying sections (3a and 3b), the wet paper sheet is dried in the pre-dryer section (3a), completely dried, and then the size is applied in the size part, and then in the after-dryer section (3b). Dry to product specification moisture.

  The pre-dryer section (3a) has 10 dry cylinders. 1 and 2 are classified into Group 1 dryer (17), No. 1 3, 4, 5 and 6 are classified into Group 2 dryer (18), 7, 8, 9 and 10 are classified as group 3 dryers (19). The first group dryer (17) dehydrates the paper at a low temperature to prevent image sticking and curling, and the second group (18) and the third group (19) dryers are used at a high temperature to completely dry the paper. In addition, the paper width is adjusted by adjusting the temperature with the second group (18) and the third group (19) dryer in which the paper moisture is reduced in the first group (17) and the paper is hardly deformed. .

  There are six dry cylinders in the after dryer section (3b). In the after dryer section (3b), all the dry cylinders are used at substantially the same temperature, the paper is dried, and the paper moisture is adjusted within the management target value.

  A size part (9) is provided between the pre-dryer part (3a) and the after-dryer part (3b), and a chemical solution is applied to the paper surface to reduce paper dust on the paper and improve printability. Further, the size part can adjust the draw, which is a paper tension adjusting mechanism, and performs expansion / contraction adjustment in the paper flow direction. The above-mentioned draw is a dimensionless number indicating the magnitude of the rotation speed of the roll with respect to the sheet flow. Since the size part (9) has a mechanism in which the paper passes between two rolls to which a predetermined pressure called a size roll is applied, the paper tension is adjusted by changing the rotation speed of the size roll. be able to.

  When the draw is adjusted in the plus direction, the rotation speed of the size roll increases with respect to the paper flow, and a stronger tension is applied to the paper between the exit of the predryer portion (3a) and the size roll. When the draw is adjusted in the minus direction, the rotation speed of the size roll is reduced with respect to the paper flow, and the tension applied to the paper is weakened. Therefore, since uniform tension is applied in the width direction of the paper by adjusting the draw, the expansion and contraction in the paper flow direction can be adjusted without causing twisting.

  The calendar unit (7) adjusts the smoothness of the paper surface and the paper thickness by allowing the paper to pass between seven calendar rolls to which a predetermined pressure is applied. The sheet that has passed through the calendar section (7) is taken up by the reel section (6). A print mark measuring mechanism (1) is provided immediately before the reel section (6), and the sheet flow direction and width direction are adjusted. Image input for grasping the expansion / contraction behavior of the paper and the paper twist is performed, and further, adjustment data including timing data when the print mark image is input is obtained. Finally, the paper wound on the reel unit (6) is sent to the next process.

  Next, the print mark measurement mechanism (1) in the paper expansion / contraction state management apparatus of the present invention will be described with reference to FIG. The print mark measuring mechanism (1) is provided between the calendar unit (not shown) and the reel unit (6), and captures a reflection image of the print mark provided on the paper (12). A light projecting unit (10) for irradiating a light source and a light receiving unit (11) for capturing an image are provided.

  FIG. 3 is an enlarged view of print marks (a, b, and c) formed on the paper (12). A plurality of print marks (a, b, and c) are formed in the width direction of the paper. Further, it is formed every time it is cut into a sheet in the next step. For example, as shown in FIG. 3, if the area where the print marks (a, b and c) for one sheet are formed is the first print mark point (A), the next sheet The region where the print marks (a, b, and c) are formed is in a state that becomes the second print mark point (A ′). Thereafter, the print marks (a, b, and c) are placed at the same interval. It is formed.

  FIG. 4 is an enlarged view of the print mark measuring mechanism (1) of the present invention, and a light projecting unit (10) for irradiating a print mark (a, b and c) formed on the paper (12) with a light source. ) And print mark (a, b, and c) are formed from a light receiving portion (11) that acquires an image. The light projecting unit (10) is not particularly limited as long as it can emit light such as an incandescent bulb, a light emitting diode, a halogen lamp, an HID lamp, and LED spot illumination. The light receiving unit is not particularly limited as long as it can acquire a print mark image such as a CCD line sensor camera or a CCD area sensor camera.

  Further, in the print mark measuring mechanism (1) shown in FIG. 4, an example in which two light projecting units (10) and one light receiving unit (11) are formed has been described. However, as shown in FIG. It is also possible to form the light receiving portions (11) as many as the number of print marks (a, b and c) provided in the direction in a straight line.

  Next, the configuration of the paper expansion / contraction state management apparatus of the present invention will be described with reference to the block diagram of FIG. First, the image input unit in the print mark measuring mechanism (1) irradiates the print mark (a, b and c) formed on the paper by the light projecting unit (10) with a light source, and the light receiving unit (11). Print mark (a, b and c) images are acquired. At this time, the timing data acquisition unit acquires the timing until the second print mark point (A ′) arrives after the first print mark point (A) has passed.

  An image obtained by the print mark measurement mechanism (1) (hereinafter referred to as “input image”) and timing data are sent to the determination mechanism, and the determination mechanism and the reference print mark image input in advance in the storage unit of the control mechanism. The difference data is acquired by comparing the timing data, and the determination unit determines whether or not the position of the print mark (a, b, and c) is in the statistical management state.

  The determination result is transmitted to the instruction unit via the control unit, and when an abnormality is confirmed, the sheet flow direction is determined from the instruction unit by the size roll adjustment unit, the dry cylinder adjustment unit, and the expander roll adjustment unit of the adjustment mechanism. , Expansion and contraction in the paper width direction, and adjustment of twist. Further, when the abnormal data exceeds the allowable range, a warning unit notifies the abnormal data. In addition, about the paper which exceeded the tolerance | permissible_range, it is good also as a structure which displays an error by a marking part (not shown).

  Next, a method for determining an input image will be described with reference to FIG. FIG. 7A shows a reference print mark (13) input in advance. FIGS. 7B, 7C, and 7D are obtained by superimposing the reference print mark (13) and the input image, and each print mark (a, b, and c) is displaced from the reference print mark. It is in the state. In FIG. 7B, the print mark formed on the paper is shifted from the center in the left-right direction. Specifically, the middle reference print mark (13) and the middle print mark (b) are substantially the same. However, since the left and right print marks (a and c) are shifted outward from the left and right reference print marks (13), the sheet is in a state of extending in the width direction.

  In FIG. 7C, all the print marks (a, b, and c) are shifted in the sheet flow direction, and the reference print mark (13) and the input image are superimposed according to the timing data. It is. In FIG. 7D, the left print mark (a) is shifted upward with respect to the reference print mark (13), the middle print mark (b) matches the reference print mark (13), and the right print mark is printed. The mark (c) shows a state of being shifted downward, and the sheet is twisted.

  FIG. 8 shows a state in which an abnormality has been found as a result of the pass / fail judgment of the print mark (a, b, and c) position based on the input image and timing data. FIG. 4 shows expansion / contraction data and torsion / extension data with respect to the flow direction.

  Each graph shown in FIG. 8 has an allowable range line and a management target range line, and the area within the circle in each graph exceeds the management target range line in the width expansion / contraction graph and the flow expansion / contraction graph. In the torsional expansion / contraction graph, the torsional expansion / contraction continuously decreases in the negative direction, and there is a bias. Therefore, an abnormal image is detected by the determination mechanism as being out of the statistical management state. In this case, the dry cylinder temperature of the drying section (3) is adjusted for the width direction abnormality, the size roll draw of the size part (9) is adjusted for the flow direction abnormality, and the expander for the twist abnormality. Adjust the roll placement angle, curvature, and placement position.

  In the case of adjusting the abnormality in the width direction, the setting values of the second group dryer (18) and the third group dryer (19) in the pre-dryer section (3a) shown in FIG. The dry cylinder temperature is controlled by the steam pressure flowing into the cylinder, and when changing the set value, the aforementioned steam pressure is adjusted. When the paper width is increased, the vapor pressure is increased, and when the paper width is decreased, the vapor pressure is decreased.

  Next, as to the case of adjusting the abnormality in the flow direction, the size roll draw is adjusted. To advance in the paper flow direction, adjust in the positive direction. To delay, adjust the draw direction in the negative direction.

  When adjusting the twist abnormality, the twist of the paper can be adjusted by adjusting the arrangement angle, curvature and arrangement position of the expander roll (8) arranged in front of the drying section (3). The expander roll (8) controls the flow of paper on the operation side and the drive side by the height difference of the rolls.

  The configuration of the expander roll (8) will be described with reference to the enlarged view of FIG. 10. The expander roll (8) has a curved shape, and prevents paper wrinkles, folds, paper twisting, and the like. The bending amount adjustment handle (14) is rotated to adjust the bending amount, and the angle adjustment handle (15) is rotated to adjust the arrangement angle of the expander roll (8) with respect to the paper flow direction. By rotating (16), the arrangement position of the expander roll (8) with respect to the paper flow direction is adjusted.

  In the adjustment of the expander roll (8) in the present invention, when an abnormality in the twist of the paper is found by the determination unit, the amount of bending of the expander roll (8) and the paper flow direction based on the difference data obtained by the calculation unit. The twist of the paper (12) is improved by automatically controlling the placement angle and the placement position with respect to.

  Next, the process of automatically controlling the expansion / contraction behavior on the paper machine using the paper expansion / contraction state management apparatus of the present invention will be described with reference to the flowchart of FIG. First, in step (hereinafter referred to as “S”)-1, print mark (a, b, and c) images formed on the paper (12) are input to obtain image data, and at the same time, as S-2, 1 Timing data is input according to the arrival timing from the first print mark point (A) to the second print mark point (A ′).

  The input image and timing data are sent to the determination unit. In S-3, the reference print mark (13) is compared with the input image, and the reference timing data and the timing data are compared to obtain difference data for determination. Send to department.

  Next, in S-4, it is determined from the timing difference data whether the print mark position is in the statistical management state. If it is the statistical management state (S-5), the current setting state is maintained (S-6). ) As a result of the determination, if an abnormality is confirmed (S-7) at the position of the print mark (a, b and c), whether the abnormality is an abnormality in the paper width direction of S-8-1 or S- It is determined whether the paper flow direction is abnormal in 8-2 or the twist abnormality in S-8-3. If the abnormality is in the paper width direction in S-8-1, the process proceeds to S-9-1. Move to adjustment of the drying section and adjust the temperature of the dry cylinder.

  If the paper flow direction is abnormal in S-8-2, the process shifts to size roll adjustment in S-9-2 and the size roll draw of size part (9) is adjusted. Further, if the twist of S-8-3 is abnormal, the angle, curvature and position of the expander roll of S-9-3 are adjusted. When a paper width direction abnormality, a paper flow direction abnormality, and a twist abnormality are simultaneously detected, adjustment is performed under optimum conditions by controlling the adjustment state of each adjustment mechanism.

  From the state where all adjustments in the adjustment mechanism have been completed, the process proceeds to S-10 to enter a standby state for about 5 minutes, and returns to the determination of S-1 to determine whether or not the print mark position is in the statistical management state. . By repeating this process until the statistical management state is reached, the position of the print mark (a, b, and c) is not shifted in the width direction and the flow direction of the paper, and the paper can be prevented from being twisted. .

DESCRIPTION OF SYMBOLS 1 Print mark measuring mechanism 2 Press part 3 Drying part 3a Pre-dryer part 3b After dryer part 4 Wire part 5 Preparation part 6 Reel part 7 Calendar part 8 Expander roll 9 Size part 10 Light projection part 11 Light-receiving part 12 Paper 13 Reference | standard print mark 14 Bending amount adjustment handle 15 Angle adjustment handle 16 Position adjustment handle 17 1st group dryer 18 2nd group dryer 19 3rd group dryer A, A 'Print mark points a, b, c Print mark

Claims (6)

A paper expansion / contraction state management device that adjusts expansion / contraction of the paper from a print mark position formed on the paper to be made on the paper machine,
A print mark measurement mechanism for obtaining a print mark image formed on the paper;
A determination mechanism that calculates the expansion / contraction state of the paper by comparing the print mark image acquired by the print mark measurement mechanism with reference data input in advance, and determines whether or not the paper is in a statistical management state. When,
An adjustment mechanism that adjusts the manufacturing conditions in accordance with the expansion and contraction behavior of the paper when the determination result of the determination mechanism is not in a statistical management state;
A sheet expansion / contraction state management apparatus comprising at least a control mechanism for controlling the print mark measurement mechanism, the determination mechanism, and the adjustment mechanism. The print mark measurement mechanism includes a light projecting unit that irradiates the paper with a light source;
A light receiving unit for capturing the print mark image;
The sheet expansion / contraction state management apparatus according to claim 1, further comprising a timing data acquisition unit that acquires timing data from the print mark position imaged by the light receiving unit. The determination mechanism, based on the print mark image data obtained by the print mark measurement mechanism and the timing data, a calculation unit that calculates the expansion and contraction state of the paper,
A storage unit for storing paper expansion / contraction information obtained by the calculation unit;
3. The paper expansion / contraction state management apparatus according to claim 1, further comprising a determination unit that determines whether the paper expansion / contraction state is a statistical management state from information stored in the storage unit.   The sheet according to any one of claims 1 to 3, wherein the determination mechanism further includes an alarm unit that notifies when the determination result of the determination unit exceeds a reference value input in advance. Telescopic state management device. The adjusting mechanism is configured to adjust a temperature in the plurality of dry cylinders to adjust expansion and contraction in the width direction of the paper;
In order to adjust the expansion and contraction of the flow direction of the paper, a size roll adjustment unit that adjusts the draw of the size roll;
5. The paper expansion / contraction state according to claim 1, further comprising an expander roll adjustment unit that adjusts an arrangement angle, an arrangement position, and a bending amount of the expander roll in order to adjust the twist of the paper. Management device.   The control mechanism selects the dry cylinder adjustment unit, the size roll adjustment unit, and the expander roll adjustment unit according to the expansion / contraction state of the paper from the determination result obtained by the determination unit, and the selected adjustment mechanism The sheet expansion / contraction state management apparatus according to claim 1, further comprising: an instruction unit that issues an instruction to the user.

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