JP2007112024A - Control device of corrugator and control method of corrugator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically operate a corrugator so as not to cause the warpage or adhesion failure of sheets, in the control device of the corrugator and the control method of the corrugator. <P>SOLUTION: In the corrugator 1 for manufacturing corrugated cardboard sheets 7 and 8 from paper sheets 3, 4 and 6, adjusting means 2 for adjusting a plurality of the adjusting elements of the corrugator 1 are controlled on the basis of the state data related to the running paper sheets 3, 4 and 6 or the corrugated cardboard sheets 7 and 8, and the control quantities of a plurality of the adjusting means are set always or at a predetermined cycle on the basis of the newest data acquired by a state data acquiring means so that the state related to the paper sheets or the corrugated cardboard sheets. A plurality of the adjusting means are controlled on the basis of the set control quantities. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an adjustment means (actuator) for adjusting a preheater winding amount, a steam pressure, a double facer pressure, a steam pressure, a glue gap amount, a wetting amount, a mill roll stand brake force, a one-stage suction pressure, etc. in a corrugator. The present invention relates to a control device and method for a corrugator that controls the above.

In a corrugator (corrugated cardboard sheet manufacturing apparatus) that manufactures various types of cardboard such as single-sided cardboard and double-sided cardboard, it is required that the manufactured cardboard does not warp or have poor adhesion. The warpage of the cardboard depends on the temperature and moisture state in each manufacturing process of the sheet constituting the cardboard, and the poor adhesion of the cardboard mainly depends on the temperature in the sheet bonding process.
For this reason, it is possible to detect sheet warpage or adhesion failure in each manufacturing process, or to detect the temperature state or moisture state in each manufacturing process that affects these product defects, and to detect these detection information. Based on this, a technique for controlling each adjusting means (actuator) of the corrugator has been developed so that the cardboard is not warped or has poor adhesion.

As a conventional control technique for preventing sheet warpage and adhesion failure in such a corrugator, for example, there is a technique using matrix control (see paragraph 0003 of Patent Document 1).
That is, as shown in FIG. 19, the upper (back) liner 3 is introduced into the upper (back) liner preheater 11 and heated, and the core 4 is introduced into the core preheater 12 and heated to be heated. The upper liner 3 and the core 4 are introduced into the single facer 13 and glued to form a single-stage sheet (single-sided cardboard sheet) 5. The single-stage sheet 5 is introduced into the single-stage preheater 14 and heated, introduced into the glue machine 15 and glued, and the lower (front) liner 6 is introduced into the lower (front) liner preheater 16 and heated and heated. The single-stage sheet 5 and the lower liner 6 are introduced into the double facer 17, pressed and heated, and bonded to form a double-sided sheet (double-sided cardboard sheet) 7. Thereafter, the double-sided sheet 7 is cut and ruled along the sheet conveying direction by a slitter scorer 18 and cut to a predetermined length in the sheet conveying direction by a cut-off 19 to form a single sheet (one double-sided sheet). 8 and stacked on the stacker 20, and the single-sided double-sided sheet 8 is unloaded from the stacker 20 as a final product.

  Each actuator of the corrugator 1 is controlled by the production management apparatus 202. In the production management apparatus 202, the production status information (base paper configuration, base paper basis weight, paper width, flute, etc.) and operation status information ( Based on the operation speed, the amount of sheet wrapped around each preheater, the vapor pressure, the applied pressure in the double facer, the vapor pressure, the glue gap amount of each gluing device, the wetting amount if equipped with a wetting device, etc.) The operation condition described in the matrix condition table is selected and the operation condition is adjusted, so-called matrix control is performed to prevent sheet warpage and sheet adhesion failure (bonding failure) on the corrugator.

  Regarding sheet warpage prevention, in addition to the matrix control described above, the sheet temperature of the back liner and the lower (front) liner at the triple preheater outlet, or the sheet temperature of the lower liner paper immediately after the hot plate outlet of the double facer PID feedback control and feedforward control (control that adjusts the preheater wrap angle, double facer pressure, etc. from the conditions such as speed, paper type, flute, etc.) A system for preventing vertical warpage in the flow (MD) direction and the width (CD) direction has also been proposed (see Patent Documents 2 and 3).

To prevent sheet adhesion failure, in addition to the above matrix control, each sheet temperature at the upper (back) liner and core at the single facer inlet, or single-stage sheet (back liner paper side) and lower at the triple preheater outlet The sheet temperature of the liner (front liner paper side) is measured, and further, the sheet temperature of the lower (front) liner immediately after the exit of the hot plate of the double facer is measured, and PID feedback control and feedforward control (speed, paper type, flute) Based on the above conditions, the seat temperature is predicted and set as the target value, and the preheater wrap angle, double facer pressure, etc. are adjusted), and the single facer part is bonded (that is, the upper liner and the wavy core (Patent Document 2, Patent Document 2) has also been proposed which prevents defects in adhesion) and defects in double facer portions (that is, adhesion between a single-stage sheet and a lower liner). Reference).
JP2003-231193 Japanese Patent No. 3492304 Japanese Patent No. 3492305

However, the conventional techniques related to the above-described sheet warpage prevention and sheet adhesion failure prevention have the following problems.
In the matrix control described above, since the operation conditions in the matrix condition table are created based on the experience and intuition so far, the adjustment of the operation conditions is rough and it is difficult to adjust the operation conditions accurately. Therefore, it is difficult to realize an automated operation that prevents matrix warpage and sheet adhesion failure using matrix control, and various operating conditions are adjusted based on the experience and intuition of the operator.

In addition, with regard to sheet warpage, warpage may occur over time (sheet warpage over time) in a stacked state after sheet manufacture, but no technology has been developed to automatically prevent such warpage in a corrugator. .
In addition, the matrix + PID feedback + predictive control described above has a greater effect of preventing sheet warpage and defective sheet adhesion than matrix control alone, but has a longer control time and more accurately prevents warpage and defective sheet adhesion. There is a need. In addition, depending on the operating conditions (speed, difference between the target value and the actual measurement value, etc.), it is necessary to use the three control modes properly, and there is a problem that the control becomes complicated.

  The present invention has been devised in view of such problems, and it is intended to provide a corrugator control device and method that can automatically operate a corrugator so that sheet warpage and sheet adhesion failure do not occur. Objective.

  In order to achieve the above object, the corrugator control device according to the present invention (Claim 1) is a corrugator that manufactures a corrugated cardboard sheet from a paper sheet. A control device for a corrugator that controls adjustment means for adjusting a plurality of adjustment elements of the corrugator based on the state information acquisition means for acquiring the state information constantly or at a predetermined cycle, and acquired by the state information acquisition means Based on the latest state information that has been set, the control amount of the plurality of adjusting means is set constantly or at a predetermined cycle so that the state relating to the paper sheet or the corrugated cardboard sheet is appropriate, and based on the set control amount Control means for controlling the plurality of adjusting means is provided.

Preferably, the control means sets the control amount based on the production status information and environmental status information of the corrugator in addition to the latest status information acquired by the status information acquisition means.
The adjusting means includes an actuator for adjusting a winding amount of the front liner, the back liner, and the core sheet around the heating roll provided in the preheater of the corrugator, and a heating vapor pressure supplied to the heating roll. An actuator for adjusting the sheet pressure in the double facer of the corrugator, an actuator for adjusting the steam pressure for heating supplied to the double facer, and a glue of a gluing device provided in the corrugator and gluing to each sheet An actuator that adjusts the gap amount, an actuator that adjusts the amount of wetting by a wetting device that wets each of the sheets or the corrugated cardboard provided on the corrugator, and a roll that is provided on the corrugator and supports the roll of each of the sheets Adjust the braking force of the mill roll stand An actuator, an actuator for adjusting the suction pressure piece stage sheet suction device provided in the corrugator in preferably contains at least one (claim 3).

  The control means includes a global optimizer that sets a feedforward amount of the control amount based on the latest state information acquired by the state information acquisition means, the production state information, and the environmental state information; And a local optimizer that sets the control amount by adding the feedback amount to the feedforward amount set by the global optimizer. (Claim 4).

In this case, it is preferable that the global optimizer is connected to the state information, the production state information, and the knowledge database that associates the environmental state information with the feedforward amount of the control amount (claim). 5).
Alternatively, it is preferable that the global optimizer is connected to a neural network having the state information, the production state information, and the environmental state information as input elements and a feedforward component of the control amount as an output element ( Preferably, the neural network is a hierarchical neural network (Claim 7).

It is preferable that the state information is information related to either sheet warpage or sheet adhesion failure.
In addition, the state information acquisition unit includes a specific information detection unit that detects specific state information among the plurality of state information, and a prediction model that is a correlation between the specific state information and the state information of the estimation target And the estimation means for estimating the state information of the estimation target, which is other information among the plurality of state information, from the specific state information detected by the specific information detection means. Preferred (claim 9).

In this case, the specific status information is a sheet temperature measurement value of the paper sheet or the cardboard sheet, the specific information detection means is a temperature sensor, and the status information of the estimation target is the paper sheet or the cardboard The information is preferably information on any of sheet moisture, sheet warpage, and sheet adhesion failure.
Alternatively, the specific state information is a sheet moisture of the paper sheet or the cardboard sheet, the specific information detecting means is a moisture sensor, and the state information of the estimation target is the sheet of the paper sheet or the cardboard sheet The information is preferably information on either warpage or poor sheet adhesion.

Alternatively, the specific state information is a sheet temperature measurement value and a sheet moisture measurement value of the paper sheet or the corrugated cardboard sheet, the specific information detection means is a temperature sensor and a moisture sensor, and the state information of the estimation target is It is preferable that the information is related to any one of sheet warp and sheet adhesion failure of the paper sheet or the corrugated cardboard sheet.
In addition, it is preferable that the information on the sheet warp includes information on the warpage of the corrugated sheets stacked as a single sheet on the stacker at the downstream end of the corrugator (claim 13).

  According to the corrugator control method of the present invention (Claim 14), in a corrugator that manufactures a corrugated cardboard sheet from a paper sheet, a plurality of adjustments of the corrugator based on one or a plurality of state information regarding the traveling paper sheet or the corrugated cardboard sheet. A corrugator control method for controlling adjustment means for adjusting an element, based on a specific information acquisition step for acquiring the state information constantly or at a predetermined cycle, and the latest state information acquired by the specific information acquisition step A control amount setting step for setting a control amount of the plurality of adjusting means at all times or in a predetermined cycle so that a state relating to the paper sheet or the corrugated cardboard sheet is appropriate, and a control amount set by the control amount setting step And a control step for controlling the plurality of adjusting means constantly or at a predetermined cycle based on It is characterized in that was.

  According to the corrugator control device (Claim 1) and method (Claim 14) of the present invention, in controlling the adjustment means for adjusting the plurality of adjustment elements of the corrugator based on the state information on the paper sheet or the corrugated cardboard sheet, The state information is acquired constantly or at a predetermined cycle, and the control amounts of the plurality of adjusting means are constantly or at predetermined intervals so that the state relating to the paper sheet or cardboard sheet is appropriate based on the acquired latest state information. Since a plurality of adjustment means are set and controlled, for example, it is possible to realize a highly accurate corrugator control that responds quickly to the state of a paper sheet or cardboard sheet. Accordingly, it is possible to automatically operate the corrugator so that the sheet warpage and the sheet adhesion failure (claim 8), which are specific examples of the state information regarding the paper sheet or the corrugated cardboard sheet, do not occur.

In addition to the latest state information acquired, the corrugator can be controlled with high accuracy by setting the control amount based on the production state information and environmental state information of the corrugator.
For example, as an adjustment means, the actuator that adjusts the amount of winding of the front liner, back liner, and core sheet around the heating roll provided in the preheater is controlled, and the heating vapor pressure supplied to the heating roll is adjusted. Control the actuator that controls the sheet pressure in the double facer, control the actuator that adjusts the steam pressure for heating supplied to the double facer, and the glue gap amount of the gluing device that glues each sheet An actuator that controls the actuator to adjust, controls the actuator that adjusts the amount of wetting by the wetting device that wets each sheet or single-stage sheet, or adjusts the braking force of the mill roll stand that supports the roll of each sheet Control the suction pressure of the single-stage sheet suction device By and controlling the actuator for settling the sheet warpage or sheet bonding failure becomes possible to prevent the occurrence (claim 3).

  The control means has a hierarchical structure composed of a high-order global optimizer and a low-order local optimizer, and the global optimizer feeds forward control amounts based on the latest state information, production state information, and environmental state information. By setting the minute amount, the local optimizer sets the feedback amount of the control amount according to the state of each adjustment element, and adds the feedback amount to the feedforward amount to set the control amount. It becomes easy to monitor and operate a plurality of adjustment elements as a whole, and to provide an optimal operation environment that eliminates complicated operations.

  In addition, a huge amount of input / output data such as the latest status information, production status information, and environmental status information is monitored and operated exclusively by the higher-level global optimizer, and operations related to control commands are handled by the lower-level local optimizer. The centralized management environment can be constructed by the global optimizer, the control system can be simply configured, and the control can be speeded up and highly accurate.

  If the global optimizer is connected to a knowledge database that associates state information, production state information, environmental state information, and control amount feedforward, control amount feedforward can be easily performed under various conditions. And it can obtain appropriately. In particular, if there is nonlinearity between each information and the feedforward, there will be a region where they do not partially match. However, if a knowledge database is used, many linear models can be created partially. Even if there is non-linearity as a whole, the feedforward component can be set with high accuracy by a simple linear model (claim 5).

  If the global optimizer is connected to a neural network (particularly a hierarchical neural network) that uses state information, production state information, and environmental state information as input elements and feedforward control amount as an output element, each information And a feed-forward correlation model can be updated by learning to construct a more accurate correlation model, which can contribute to improvement in control accuracy (Claims 6 and 7).

  In addition, the state information acquisition means uses the specific information detection means for detecting the specific state information, and the specific state information detected using a prediction model that is a correlation between the specific state information and the state information to be estimated. Thus, by estimating the state information of the estimation target, it is possible to grasp the state information of the estimation target only by providing a detection unit for the specific state information and without providing a detection unit for the state information of the estimation target. Therefore, the corrugator can be controlled with high accuracy while suppressing an increase in cost (claim 9).

  For example, by preparing a prediction model for the correlation between the sheet temperature on the corrugator and any of sheet moisture, sheet warpage, and sheet adhesion failure, the sheet temperature on the corrugator as specific state information is detected, By using a prediction model to estimate any of sheet moisture, sheet warpage, and sheet adhesion failure from the sheet temperature, the status of sheet moisture, sheet warpage, and sheet adhesion failure can be ascertained without providing each detection means. This can reduce the cost of the apparatus. By enhancing the sheet temperature detection means and creating a prediction model with high accuracy, various status information related to paper sheets or cardboard sheets can be accurately grasped while reducing the equipment cost and maintenance burden. (Claim 10).

  Also, prepare a prediction model for the correlation between the sheet moisture on the corrugator and any of sheet warp or sheet adhesion failure, detect the sheet moisture on the corrugator as specific state information, By using the sheet moisture to estimate either sheet warpage or sheet adhesion failure, it is possible to grasp the state of the sheet warpage or sheet adhesion failure without providing each detection means, thereby reducing the cost of the apparatus. This makes it possible to suppress various types of status information related to the paper sheet or cardboard sheet while accurately reducing the apparatus cost and the maintenance burden (claim 11).

  Also, prepare a prediction model for the correlation between the sheet temperature and sheet moisture on the corrugator and any of sheet warp and sheet adhesion failure, and the sheet temperature and sheet moisture on the corrugator as specific status information By detecting and estimating either sheet warpage or sheet adhesion failure from sheet moisture using a prediction model, it is possible to grasp the state of sheet warpage or sheet adhesion failure without providing each detection means. The cost of the apparatus can be suppressed, and various status information relating to the paper sheet or cardboard sheet can be accurately grasped while reducing the apparatus cost and the maintenance burden as a whole. ).

  As information regarding sheet warpage, if it is possible to estimate information on the stacking warpage of the corrugated sheets stacked as a single sheet on the stacker at the downstream end of the corrugator, it is less likely to cause warpage of stacking and higher quality. Corrugated cardboard sheets can be produced (claim 13).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[A. First Embodiment]
1 to 5 show a corrugator and a seat state information estimation device according to a first embodiment of the present invention. FIG. 1 is a schematic configuration diagram thereof, FIGS. 2 to 4 are detailed configuration diagrams thereof, and FIG. It is a perspective view which shows the curvature simple model.

  As shown in FIG. 1, the corrugator 1 according to the present embodiment includes an upstream (back) liner preheater 11, a core preheater 12, a single facer 13, a single stage preheater (single sheet preheater) 14, A glue machine 15, a lower (table) liner preheater 16, a double facer 17, a slitter scorer 18, a cut-off 19, and a stacker 20 are provided.

  The upper (back) liner 3 is introduced into the upper liner preheater 11 and heated, and the core 4 is introduced into the core preheater 12 and heated, and the heated upper liner 3 and the heated core 4 are single facers. The single-stage sheet (single-sided corrugated cardboard sheet) 5 is formed by being introduced into 13 and glued. Further, the single-stage sheet 5 is introduced into the single-stage preheater 14 and heated, and then introduced into the glue machine 15 to be glued. Further, the lower (front) liner 6 is introduced into the lower liner preheater 16 and heated, and the heated single-stage sheet 5 and the lower liner 6 are introduced into the double facer 17 and are pressed and heated to be bonded to each other. (Double-sided cardboard sheet) 7 is formed. Thereafter, the double-sided sheet 7 is cut (cut) and ruled along the sheet conveying direction by a slitter scorer 18, and further cut (cut) to a predetermined length in the sheet conveying direction by a cut-off 19. A sheet (one double-sided sheet) 8 is stacked on the stacker 20. Thereafter, the single-sided double-sided sheet 8 is unloaded from the stacker 20 as a final product.

  Here, the detailed configurations of the upper liner preheater 11, the core preheater 12, the single-stage preheater 14, the lower liner preheater 16, the single facer 13, the glue machine 15, and the double facer 17 will be described with reference to FIGS. I will explain. 2 is a schematic diagram showing the configuration of the upper liner preheater 11, the single facer 13, and the center core preheater 12. FIG. 3 shows the one-stage preheater 14, the lower liner preheater 16, the glue machine 15, and the double facer 17. FIG. 4 is a schematic diagram showing a configuration of a part of the double facer 17.

  As shown in FIG. 2, the back liner pre-heater 11 includes back liner heating rolls 111 </ b> A and 111 </ b> B arranged vertically in two stages. The back liner heating rolls 111A and 111B are heated to a predetermined temperature by supplying steam therein. The back liner 3 guided in order by the guide rolls 115, 114A, 116, and 114B is wound around the peripheral surfaces of the back liner heating rolls 111A and 111B, and preheated by the back liner heating rolls 111A and 111B.

  Of the guide rolls 115, 114A, 116, and 114B, the guide roll 114A provided in the vicinity of one back liner heating roll 111A is the tip of an arm 113A that is swingably attached to the shaft of the back liner heating roll 111A. The guide roll 114B provided in the vicinity of the other back liner heating roll 111B is supported at the tip of an arm 113B that is swingably attached to the shaft of the back liner heating roll 111B. Each arm 113A, 113B can be moved to an arbitrary position within an angle range indicated by an arrow in the drawing by a motor (not shown). Here, the guide roll 114A, the arm 113A, and a motor (not shown), and the guide roll 114B, the arm 113B, and a motor (not shown) constitute the winding amount adjusting devices 112A and 112B, respectively.

  With such a configuration, in the back liner preheater 11, the vapor pressure supplied to the back liner heating rolls 111A and 111B and the winding amount of the back liner 3 on the back liner heating rolls 111A and 111B by the winding amount adjusting devices 112A and 112B. The water content of the back liner 3 can be adjusted by (wrapping angle). Specifically, the greater the vapor pressure and the greater the amount of wrapping, the greater the amount of heat applied from the back liner heating rolls 111A and 111B to the back liner 3, and the drying of the back liner 3 proceeds and the water content is increased. Will drop.

  The single facer 13 includes a pressure belt 133 wound around a belt roll 131 and a tension roll 132, and an upper roll 134 that has a wave-like surface and is in contact with the pressure belt 133 in a pressurized state. A lower roll 135 having a wave-like surface and meshing with the upper roll 134 is provided. The back liner 3 heated by the back liner preheater 11 is wound around the liner preheating roll 137 and preheated on the way, and then guided by the belt roll 131 and together with the pressure belt 133 and the upper belt 133. It is transferred to the nip portion with the roll 134.

On the other hand, after the core 4 heated by the core preheater 12 is wound around the core preheating roll 138 and preheated, the core 4 is wound around the meshing portion between the upper roll 134 and the lower roll 135. Then, it is guided by the upper roll 134 and transferred to the nip portion between the pressure belt 133 and the upper roll 134.
A gluing device 136 is disposed in the vicinity of the upper roll 134. The gluing device 136 adjusts the amount of glue 30 attached to the peripheral surface of the gluing roll 136b, the gluing roll 136b that glues the gluing dam 136a that stores the gluing 30, the middle core 4 conveyed by the upper roll 134, and the gluing roll 136b. A meter roll 136c and a glue scraping blade 136d for scraping glue from the meter roll 136c are configured. The core 4 wound around the meshing portion of the upper roll 134 and the lower roll 135 is glued to each top of the stage by the gluing roll 136b, and is attached to the back liner 3 at the nip portion between the pressure belt 133 and the upper roll 134. It is pasted together. Thereby, the single-stage sheet | seat 5 is formed.

  With such a configuration, in the single facer 13, the moisture content of the back liner 3 is controlled by the gap amount between the gluing roll 136b and the upper roll 134 and the gap amount between the gluing roll 136b and the meter roll 136c. It can be adjusted. Specifically, as the gap amount is larger, the amount of glue on the bonding surface between the core 4 and the back liner 3 is increased, and the moisture content of the back liner 3 is increased by the moisture contained in the glue. Each of the gap amounts can be adjusted by moving the gluing roll 136b or moving the meter roll 136c.

  The core preheater 12 has the same configuration as the back liner preheater 11, and the core heating roll 121 heated to a predetermined temperature by supplying steam therein, and the core heating roll 121 A winding amount adjusting device 122 that adjusts the winding amount (winding angle) of the core 4 is provided. The winding amount adjusting device 122 includes a guide roll 124 around which the core 4 is wound, an arm 123 that is swingably attached to the shaft of the core heating roll 121 and supports the guide roll 124, and rotates the arm 123. It is composed of a motor that does not.

  The single-stage sheet preheater 14 and the front liner preheater 16 are vertically arranged in two stages as shown in FIG. These preheaters 14 and 16 have the same configuration as the above-described back liner preheater 11. The single-stage sheet preheater 14 includes a single-stage sheet heating roll 141 and a winding amount adjusting device 142. The single-stage sheet heating roll 141 is heated to a predetermined temperature by supplying steam therein. Around the circumferential surface of the single-stage sheet heating roll 141, the back liner 4 side of the single-stage sheet 5 guided in order by the guide rolls 145 and 144 is wound and preheated by the single-stage sheet heating roll 141.

  The winding amount adjusting device 142 includes one guide roll 144, an arm 143 that is swingably attached to the shaft of the one-stage sheet heating roll 141, and supports the guide roll 144, and a motor (not shown) that rotates the arm 143. Has been. Then, the guide roll 144 is moved to an arbitrary position within the angle range indicated by the arrow in the drawing by the control of the motor so that the winding amount (winding angle) of the single-stage sheet 5 around the single-stage sheet heating roll 141 can be adjusted. It has become.

  With such a configuration, in the preheater 14 for a single-stage sheet, the moisture content of the back liner 4 depends on the vapor pressure supplied to the single-stage sheet heating roll 141 and the winding amount (winding angle) of the single-stage sheet 5 around the single-stage sheet heating roll 141. The amount can be adjusted. Specifically, the greater the vapor pressure and the greater the amount of wrapping, the greater the amount of heat applied from the single-stage sheet heating roll 141 to the back liner 4, and the drying of the back liner 4 proceeds and the water content decreases. Will do.

  The front liner preheater 16 includes a front liner heating roll 161 and a winding amount adjusting device 162. The front liner heating roll 161 is heated to a predetermined temperature by supplying steam therein. A front liner 6 guided in order by guide rolls 165 and 164 is wound around the peripheral surface of the front liner heating roll 161 and preheated by the front liner heating roll 161.

  The winding amount adjusting device 162 includes one guide roll 164, an arm 163 that is swingably attached to the shaft of the front liner heating roll 161 and supports the guide roll 164, and a motor (not shown) that rotates the arm 163. Has been. Then, the guide roll 164 is moved to an arbitrary position within the angle range indicated by the arrow in the drawing by the control of the motor so that the winding amount (winding angle) of the front liner 6 around the front liner heating roll 161 can be adjusted. It has become.

  With such a configuration, in the front liner preheater 16, the moisture content of the front liner 6 depends on the vapor pressure supplied to the front liner heating roll 161 and the winding amount (winding angle) of the front liner 6 around the front liner heating roll 161. The amount can be adjusted. Specifically, the greater the vapor pressure and the greater the amount of wrapping, the greater the amount of heat applied from the surface liner heating roll 161 to the surface liner 6, and the drying of the surface liner 6 proceeds and the water content decreases. Will do.

  The glue machine 15 includes a gluing device 151 and a pressure bar device 152. The single-stage sheet 5 heated by the single-stage sheet preheater 14 is preheated by the single-stage preheating roll 155 and then guided in order in the glue machine 15 by the guide rolls 153 and 154. The gluing device 151 is disposed on the lower side (the center core 4 side) of the single-stage sheet 5 between the guide rolls 153 and 154, and the pressure bar device 152 is disposed on the upper side of the traveling line (the back liner 3 side). Has been.

  The gluing device 151 includes a gluing dam 151a in which the gluing 31 is stored, a gluing roll 151b disposed in the vicinity of the traveling line of the single-stage sheet 5, and a doctor roll 151c that contacts the gluing roll 151b and rotates reversely with the gluing roll 151b. Has been. On the other hand, the pressure bar device 152 includes a pressure bar 152a disposed so as to sandwich the single-stage sheet 5 between the pressure bar 151a and an actuator 152b that presses the pressure bar 152a toward the glue roll 151b. Yes. The single-stage sheet 5 is pressed against the gluing roll 151b by the pressure bar 152a, and when passing between the pressure bar 152a and the gluing roll 151b, the gluing roll 151b glues the top of each step of the core 4. It has come to be. The single-stage sheet 5 glued to the middle core 4 is bonded to the front liner 6 by a double facer 17 in the next process.

  With such a configuration, in the glue machine 15, the moisture content of the front liner 6 is determined by the gap amount between the gluing roll 151b and the pressure bar 152a (that is, the gap amount of the gluing roll 151b with respect to the travel line of the single-stage sheet 4). It can be adjusted. Specifically, as the gap amount increases, the amount of glue on the bonding surface between the core 4 and the front liner 6 increases, whereby the amount of water applied to the front liner 6 increases and the water content of the front liner 6 increases. Will increase. The gap amount can be adjusted by adjusting the position of the pressure bar 152a by the actuator 152b.

  The single-stage sheet 5 glued by the glue machine 15 is transferred to the double facer 17 of the next process. The front liner 6 heated by the front liner preheater 16 is also transferred to the double facer 17 through the glue machine 15. At that time, the front liner 6 is preheated from the liner preheating roll 156 while being guided by the liner preheating roll 156 disposed in the glue machine 15.

  At the entrance of the double facer 17, a first shower device (back liner wetting device) 171 A as a wetting device or a moisture applying device is arranged on the back liner 3 side along the traveling line of the single-stage sheet 5, and on the front liner 6 side. A second shower device (front liner wetting device) 171B as a wetting device or a moisture applying device is disposed. These shower devices 171A and 171B are for adjusting (wetting) the moisture content of the back liner 3 and the front liner 6, and are directed from the shower device 171A toward the back liner 3 and from the shower device 171B to the front surface. Water is jetted toward the liner 6. And the moisture content of the back liner 3 increases according to the shower amount from the shower device 171A, and the moisture content of the front liner 6 increases according to the shower amount from the shower device 171B. The shower devices 171A and 171B are controlled independently of each other.

In this embodiment, a moisture applying device for the upper and lower liners is provided before the double facer as described above. However, this moisture providing device is usually provided as an option and is not essential. Further, the moisture applying device may be equipped and controlled for the upper and lower liners after the double facer.
As shown in FIG. 4, the double facer 17 is divided into an upstream heating section 17 </ b> A and a downstream cooling section 17 </ b> B along the travel lines of the single-stage seat 5 and the front liner 6. Among these, a plurality of heating plates 172 are arranged in the heating section 17 </ b> A, and the front liner 6 passes over these heating plates 172. The hot platen 172 is heated to a predetermined temperature by supplying steam therein.

  In addition, a loop-shaped pressure belt 173 travels on the heating plate 172 in synchronism with the single-stage sheet 5 and the front liner 6 across the travel line. The pressure unit 174 is disposed so as to face the hot platen 172. The pressure unit 174 includes a pressure bar 174 a that is in sliding contact with the back surface of the pressure belt 173, and an actuator 174 b that presses the pressure bar 174 a against the heating plate 172 side.

  The single-stage sheet 5 glued by the glue machine 15 is carried between the pressure belt 173 and the heating plate 172 from the pressure belt 173 side. On the other hand, the front liner 6 heated by the front liner preheater 16 is preheated by the liner inlet preheating roll 175 and then carried between the pressure belt 173 and the hot platen 172 from the hot platen 172 side. . Then, after the single-stage sheet 5 and the front liner 6 are carried between the pressure belt 173 and the heating platen 172, respectively, the single-stage sheet 5 and the front liner 6 are integrally transferred to the cooling section 17B in a state where they overlap each other. . During the transfer, the single-stage sheet 5 and the front liner 6 are heated from the front liner 6 side while being pressurized by the pressure unit 174 via the pressure belt 173, thereby being bonded to each other to form the cardboard sheet 7. The entire width or end of the corrugated cardboard sheet 7 is cut by a rotary shear 176 provided at the outlet of the cooling section 17B, and is transferred to a slitter scorer 18 in the next process.

  With such a configuration, in the double facer 17, the moisture content of the front liner 6 can be adjusted by the vapor pressure supplied to the hot platen 172 and the pressurizing force of the pressurizing unit 174. Specifically, the greater the vapor pressure and the greater the applied pressure, the greater the amount of heat applied from the hot platen 172 to the front liner 6, leading to the drying of the front liner 6 and the reduced water content. become. The moisture content of the front liner 6 can also be adjusted by the speed at which the single-stage sheet 5 and the front liner 6 pass through the double facer 17. In this case, the slower the passing speed, the longer the time during which the front liner 6 is in contact with the hot platen 172, and thus the drying of the front liner 6 proceeds and the water content decreases.

  In such a corrugator 1, the heating state of the sheet by each preheater of the upper (back) liner preheater 11, the core preheater 12, the single-stage preheater 14, and the lower (front) liner preheater 16, and the single facer 13 The glue gap amount in the glue machine 15 and the pressurizing force in the double facer 17 are controlled through the production management device (controller) 2.

  The heating state of the sheet by each preheater is adjusted by adjusting the amount of sheet wound around each heating roll of each preheater by an actuator such as a motor (not shown), or the steam supply valve (not shown) for the vapor pressure to each heating roll. It can be controlled by adjusting with an actuator such as an opening adjustment solenoid. The glue gap amount is the gap amount between the glue roll and the sheet running line. As described above, in the single facer 13, the gap amount between the glue roll and the upper roll is not shown in the actuator such as a motor. The glue machine 15 can control the gap amount between the gluing roll and the pressure bar by adjustment using an actuator such as a motor (not shown).

  In addition, as the control target element (adjustment element), a shower device provided at the entrance or exit of the double facer 17 and humidifying the back liner 3 or a shower device humidifying the front liner, and a front liner There is a heating state (steam pressure or steam amount supplied to the inside) of the hot platen that is arranged along the traveling line 6 and heats the front liner 6, and in the shower amount, the opening adjustment solenoid of the shower supply valve In the heating state of the actuator and the heating plate, it can be controlled by adjustment by each actuator (adjusting means) such as an actuator such as an opening adjustment solenoid of a steam supply valve to the heating plate.

  Although not described in this embodiment, the braking force of the mill roll stand that supports each sheet roll around which the upper (back) liner, the center core, and the lower (front) liner are wound, and bridge conveyance The suction pressure and suction brake force applied to the single-sided cardboard sheet of the single-stage sheet suction device at the conveyor are also controlled elements (adjustment elements), and these can also be adjusted by each actuator.

  Here, each control target element (adjustment element) and sheet warpage which is state information regarding a paper sheet or a corrugated cardboard sheet [MD direction warpage in the sheet traveling direction, CD direction warpage in the sheet width direction (see FIG. 13), product The relationship with the most warped over time (the warp over time at the end of the product)] will be described with reference to FIG. In FIG. 6, the single stage preheater 14 and the lower liner preheater 16 are shown as triple preheaters, but there is no substantial difference.

  As shown in FIG. 6, MD direction warpage is the disc brake force to the back liner in the mill roll stand (MRS) for the back liner, the suction brake force to the single-sided cardboard sheet on the bridge conveyor, and the surface liner The disc brake force to the front liner at the mill roll stand (MRS) is affected. The number indicated by [n] in FIG. 6 indicates the degree of influence, and the suction brake force on the bridge conveyor and the disc brake force on the front liner greatly affect the MD direction warpage.

  The warpage in the CD direction is the winding angle of the back liner (corresponding to the change in temperature) in the double liner preheater for single facer (corresponding to the back liner preheater 11), the gap between the glue / scraping rolls in the single facer 11. Winding of single-sided corrugated cardboard sheets in the amount (corresponding to changes in the amount of moisture, etc.), the winding angle of the core in the core preheater 12 (corresponding temperature change), and the triple preheater (corresponding to the single stage preheater 14) Angle (corresponding temperature change), front liner winding angle (corresponding temperature change) in triple preheater (corresponding to front liner preheater 16), glue / scraping roll gap amount in glue machine 15 (Changes in the amount of water corresponding to this), to single-sided cardboard sheet just before the double facer Moisture supply, moisture supply to the front liner in the double facer immediately before, pressure in the double facer, each such winding angle (temperature change corresponding thereto) factors can affect. The numbers indicated by [n] in FIG. 6 indicate the degree of influence, and moisture application to the single-sided cardboard sheet and moisture application to the front liner have the greatest influence on the warpage in the CD direction.

Further, the time-dependent loading warp is affected by the moisture application to the respective liners on the front and back of the cardboard sheet after the double facer.
As shown in FIG. 1, the production management device (controller) 2 controls each of the above-described sheet heating, glue gap amount, pressure, and the like based on the corrugator production state information, the corrugator machine state information, and the sheet state information. A control amount calculation unit 21 that calculates a control amount applied to a target element (adjustment element), a process controller 22 that controls the sheet heating, the glue gap amount, the pressing force, and the like, and the sheet heating, glue gap amount, An optimum state storage unit 23 for storing an optimum state of the applied pressure is provided.

  In the present embodiment, as shown in FIGS. 1 and 5, the control amount calculation unit 21 sets the feed forward amount (feed forward amount), which is the main element (target value) of the control amount, at any time or an appropriate period (for example, , 100 msec to 1 sec), and is configured as a high-order optimizer (global optimizer) that is periodically optimized, and the process controller 22 is based on the difference between the actual values with respect to the feedforward amount (target value) optimized by the global optimizer 21 It is configured as a low-order optimizer (local optimizer) that optimizes the feedback control amount (feedback) at all times or periodically with an appropriate period.

  That is, in the global optimizer 21, as shown in FIG. 5, the corrugator production state information (environmental conditions), the corrugator machine state information (operating conditions), and the sheet state information (obtained from the sheet state quantity obtaining means 24). Based on the sheet temperature of each part of the corrugator, sheet moisture, each sheet warp, and sheet state quantity such as sheet adhesion failure), the target value of the control amount of each control element (system parameter) is set constantly or at an appropriate cycle. Is set as a feedforward amount (ie, a feedforward controller is designed). Note that the sheet state quantity acquisition means 24 detects and estimates sheet state quantities such as sheet temperature, sheet moisture, each sheet warp, and sheet adhesion failure.

  In the present embodiment, the knowledge database 28 is used for setting the target value. This knowledge database 28 shows the correspondence between corrugator production state information (environmental conditions), corrugator machine state information (operating conditions), seat state information, and target values of control amounts of each control element (system parameter). These are stored in various forms, constructed using experiments or simulations, and converted into a database as the knowledge database 28.

  In the local optimizer 22, the state quantity of each control element (system) such as each preheater, single facer, glue machine, double facer, shower, and the feedforward amount (target) of each control element (system) optimized by the global optimizer 21. Value), the correction amount of each control parameter is set (identified) at all times or in an appropriate cycle, and this is set as a feedback control amount (feedback amount) (that is, a feedback controller is designed).

As a result, the local optimizer 22 calculates the sum of the feedforward amount and the feedback amount, and outputs this as a command control amount.
Here, the correspondence between various sheet warpages stored in the knowledge database 28 will be described with reference to FIGS.
If attention is paid to the elements related to the CD direction warping (CD direction vertical warping), as shown in FIG. 7, when the moisture or temperature in each part is u _n and the target value is w _n , the vertical warping state is related to y _n . In the part, the following relationship holds.

  In the back liner pre-heater 11, the following relationship (1) is established.

  In the core pre-heater 12, the following relationship (2) is established.

  In the single facer 13, the following relationship (3) is established.

  In the bridge conveyor (B / C), the following relationship (4) is established.

  In the preheater 14 for a single-stage sheet, the relationship represented by the following formula (5) is established.

  In the glue machine 15, the following relationship (6) is established.

  In the shower (SW) to the single-stage sheet, the relationship represented by the following formula (7) is established.

  In the surface liner pre-heater 16, the following relationship (8) is established.

  In the shower (SW) to the surface liner, the following relationship (9) is established.

  In the double facer 17, the relationship represented by the following formula (10) is established.

In such a relational expression, it is necessary to obtain the functions f _{1 to} f ₁₀ and g _{1 to} g _9, and for these functions, the production state (environmental conditions) and machine state (operating conditions) of the corrugator The knowledge database 28 stores the functions f _{1 to} f ₁₀ and g _{1 to} g ₉ set for each condition. . Thereby, the global optimizer 21 can set the target value of the control amount of each control element (system parameter) from the sheet state information.

Next, focusing on the elements related to MD direction warpage (MD direction vertical warpage), as shown in FIG. 8, when the tension or brake force at each portion is n _Mn and the target value is w _Mn , the vertical warp state y _Mn In each part, the following relationship holds.
In the mill roll stand (MRS) for the back liner, the relationship represented by the following formula (11) is established.

  Regarding the tension change on the way from the MRS of the single-stage sheet to the bridge conveyor (BDC), the following relationship (12) holds.

  In the bridge conveyor (BDC), the following relationship (13) is established.

  In the mill roll stand (MRS) for the front liner, the relationship represented by the following formula (14) is established.

Moreover, _ym4 = _ym6 is a condition.
In such a relational expression, it is necessary to obtain the functions f _{m1 to} f _m6 and g _{m1 to} g _m3 . For these functions, the corrugator production state (environmental condition) and machine state (operating condition) The knowledge database 28 stores data in which each function is set for each condition. Thereby, the global optimizer 21 can set the target value of the control amount of each control element (system parameter) from the sheet state information.

Next, paying attention to the factors related to the time-dependent loading warp, as shown in FIG. 9, the sheet moisture or temperature in each part is n _Sn , the target value is w _Sn , and the outside moisture or temperature is x _Sn. With respect to the warped state y _Sn , the following relationship is established in each part.
In the case where the moisture applying device is provided after the double facer, the relationship represented by the following formula (15) is established in the moisture applying device.

  In the case where the moisture applying device is provided before the double facer, the relationship shown by the following formula (16) is established in the moisture applying device.

In such a relational expression, it is necessary to obtain each function f _S , g _S, etc., and for each of these functions, depending on the production state (environmental condition) and machine state (operating condition) of the corrugator, It can be obtained by using an experiment or a simulation, and the knowledge database 28 stores data in which each function is set for each condition. Thereby, the global optimizer 21 can set the target value of the control amount of each control element (system parameter) from the sheet state information.

Further, conceptually, as shown in FIGS. 10 and 11, the knowledge database 28 includes a condition vector φ (i) relating to the environmental conditions and operating conditions of the corrugator, and system parameters (types of control elements). And a large number of data vectors Φ (i) in which a parameter vector θ (i) consisting of the corresponding target values is set.
Accordingly, when the environmental conditions and operating conditions of the corrugator are adapted as they are, the global optimizer 21 can control each control from the state information of the sheet by extracting the parameter vector θ (a) from the corresponding data vector Φ (a). The target value of the control amount of the element (system parameter) can be set.

  On the other hand, if the environmental conditions and operating conditions of the corrugator do not match as they are, a condition vector φ (b) whose vector distance is closest to the environmental conditions and operating conditions at that time is selected, and parameters are selected from this data vector Φ (b). By extracting the vector θ (b), the global optimizer 21 can approximately set the target value of the control amount of each control element (system parameter) from the sheet state information.

  As shown in FIG. 12, the local optimizer 22 sets a feedback control amount (for feedback) from the state amount of the control element at each time point and controls each control element. As feedback control by the local optimizer 22, for example, I control (integral control) can be used. In addition, P control (proportional control), PI control (proportional integral control), PID control (proportional integral differential control). ) Etc. may be used.

Since the corrugator control device and method according to the first embodiment of the present invention are configured as described above, the operation of the corrugator is controlled as follows.
In other words, when the corrugator is started, the local optimizer 22 always grasps the machine state of the corrugator 1 and periodically or periodically or changes the current machine state periodically according to a request from the global optimizer 21. Output to.

  In the global optimizer 21, corrugator production state information (environmental conditions), corrugator machine state information (operating conditions), sheet state information (sheet temperature, sheet moisture of each part of the corrugator acquired from the sheet state quantity acquisition unit 24, The target value of the control amount of each control element (system parameter) is set constantly or at an appropriate cycle from each sheet warp and sheet state amount such as sheet adhesion failure, and this is set as the feed forward amount.

In setting the target value, the global optimizer 21 uses the knowledge database 28.
In the local optimizer 22, the state quantity of each control element (system) such as each preheater, single facer, glue machine, double facer, shower, and the feedforward amount (target) of each control element (system) optimized by the global optimizer 21. Value) and set (identify) the correction amount of each control parameter at any time or in an appropriate cycle, and set this as the feedback control amount (feedback amount). The sum of the feedforward amount and the feedback amount described above Is output as a command control amount.

  In this way, in the present apparatus and method, the control amount is updated constantly or at a predetermined cycle to control each adjustment element. Therefore, the corrugator can be controlled with high accuracy in response to the state of the paper sheet or cardboard sheet. Can be realized. Thereby, it becomes possible to automatically operate the corrugator so that sheet warpage and sheet adhesion failure, which are specific examples of the state information relating to the paper sheet or cardboard sheet, do not occur.

  In particular, the controller has a hierarchical structure including a higher-level global optimizer 21 and a lower-level local optimizer 22, and is controlled by the global optimizer 21 based on the latest status information, production status information, and environmental status information. The amount of feed forward is set, the feedback amount of the control amount is set by the local optimizer 21 according to the state of each adjustment element, and the amount of feedback is added to the feed forward amount to set the control amount. Therefore, it becomes easy to monitor and operate a plurality of adjustment elements having correlation as a whole, and to provide an optimal operation environment that eliminates complicated operations.

  In addition, a large amount of input / output data such as the latest status information, production status information, and environmental status information is monitored and operated exclusively by the upper global optimizer 21, and operations related to control commands are handled by the lower local optimizer 22. With this configuration, it is possible to construct a centralized management environment by the global optimizer, and the control system can be configured simply, and the control can be made faster and more accurate.

  Furthermore, since the global optimizer 21 sets the control amount (feed forward) using the knowledge database in which the state information, the production state information, the environmental state information, and the feed forward amount of the control amount correspond to each other, the control amount It can be obtained easily and appropriately. In particular, if there is nonlinearity between each information and the feedforward, there will be a region where they do not partially match. However, if a knowledge database is used, many linear models can be created partially. Even if there is nonlinearity as a whole, it is possible to set the feedforward component with high accuracy with a simple linear model.

[B. Second Embodiment]
14 and 15 are schematic configuration diagrams showing a corrugator control device according to a second embodiment of the present invention.
As shown in FIGS. 14 and 15, in this embodiment, a knowledge database is not used.
In other words, it is assumed that the correspondence relationship for the feedforward of the control amount with respect to the corresponding state information, production state information, and environmental state information is stored in the global optimizer 21 in advance.
In this way, even if the knowledge database is not used, the control amount is updated constantly or at a predetermined cycle, and the effect of controlling each adjustment element, the controller, the upper global optimizer 21, and the lower local The effect of the hierarchical structure including the optimizer 22 can be obtained.

[C. Third Embodiment]
16 and 17 are schematic configuration diagrams illustrating a corrugator control device according to a third embodiment of the present invention.
As shown in FIG. 16, in this embodiment, a neural network (particularly, a hierarchical neural network) 29 is provided instead of the knowledge database.
As shown in FIGS. 16 and 17, the neural network 29 includes an input layer 29a, an intermediate layer 29b, and an output layer 29c. State information, production state information, and environmental state information are input to the input layer 29a. Each control amount (target value) is output from the output layer 29c via 29b. The neural network 29 learns in advance so as to obtain an appropriate output with respect to the input by simulation or test, and constructs the intermediate layer 29b.

Other configurations are the same as those of the first embodiment.
Since the corrugator control device and method according to the third embodiment of the present invention are configured as described above, they can operate in substantially the same manner as in the first embodiment to obtain substantially the same effects.
In this embodiment, unlike a knowledge database, it is not necessary to create and maintain a large amount of database, so that it is easy in terms of data management. Further, since the neural network 29 is suitable for learning update, the neural network 29 can be learned and updated while using a machine, so that a more accurate neural network can be constructed.

[D. Fourth Embodiment]
FIG. 18: is a schematic block diagram which shows the control apparatus of the corrugator concerning 4th Embodiment of this invention.
As shown in FIG. 18, in the present embodiment, as the sheet state information acquisition means for acquiring the sheet state information, the sheet state information is not acquired by hardware (physical sensor), but software (computer) 24A is provided.
In the soft sensor (sheet state acquisition means) 24A according to the present embodiment, the temperature sensors (non-contact type sensors) 31a to 31a in which the detection information of the sheet temperature of each part (including the exit part of the stacker 18) of the corrugator 1 is installed in each part. From 31 m, the sheet moisture of each part is predicted from each of these sheet temperatures, and further, the sheet warpage is predicted from the predicted sheet moisture of each part, and the sheet adhesion failure of each part is predicted from the sheet temperature of each part. It has become. In particular, these predictions are performed using a prediction model built in advance.

  The temperature sensor includes an upstream portion and a downstream portion of the upper liner preheater 11, an upstream portion and a downstream portion of the core preheater 12, a downstream portion of the single facer 13, an upstream portion and a downstream portion of the single stage preheater 14, and a group. A downstream portion of the machine 15, an upstream portion and a downstream portion of the lower liner preheater 16, a downstream portion of the double facer 17, and a downstream portion of the stacker 20 are provided.

Here, the prediction model will be described.
First, the principle of predicting sheet moisture from sheet temperature will be described. When the sheet temperature of each part where the temperature sensor is installed is in the respective reference temperature state, the sheet moisture content of each part becomes the reference moisture content, but if the sheet moisture content of each part differs from the reference moisture content, the corresponding parts The sheet temperature is also different from the reference temperature. Further, the change in the sheet moisture content in each part appears not only as the sheet temperature itself in each part but also as a change in sheet temperature between the parts. Therefore, the sheet temperature of each part and / or the sheet moisture content of each part against the sheet temperature change between the parts can be obtained in advance using experiments or simulations, and the temperature range of each part assumed is sufficiently In order to cover, the correspondence of the sheet moisture content of each part to the sheet temperature of each part and / or the sheet temperature change between the parts is obtained, and this is set in the prediction model.

Next, the principle of predicting sheet warpage from sheet moisture will be described. The sheet expands or contracts in accordance with the sheet moisture content and applied tension, and in accordance with the difference in elongation or shrinkage between the front liner 6 and the back liner 1. Warping occurs. As shown in FIG. 13, this warp differs between the MD direction and the CD direction when the traveling direction of the sheet is the MD direction and the width direction of the sheet is the CD direction.
For example, when a standard tension is applied to the sheet and the sheet moisture is changed by 1%, the MD direction elongation or shrinkage and the CD direction elongation or shrinkage due to moisture are as follows.
-MD direction moisture elongation or shrinkage: 0.03% / [1% moisture change]
・ Moisture elongation or shrinkage in CD direction: 0.1% / [1% moisture change]
When the sheet moisture is increased by 1%, the above numerical value is increased, and when the sheet moisture is decreased by 1%, the sheet is decreased by the above numerical value.

Moreover, the extension or shrinkage in the MD direction due to moisture is as follows.
・ MD direction tensile elongation or shrinkage: 0.07% / [tensile 1 kgf / cm change]
When the tension is increased by 1 kg, the above-mentioned numerical value is increased, and when the tension is decreased by 1 kg, the above-mentioned numerical value is decreased.
Thereby, it is possible to predict the expansion or contraction of the sheet in each direction when the sheet moisture and the sheet tension change from the steady state (sheet moisture: 8 to 10%, sheet tension: 0 to 0.25 kgf / cm). it can.

The warp factor of the sheet is the WF (warp factor) indicating the warp state in the MD direction and the CD direction according to the following formula, by obtaining the difference between the sheet expansion and contraction in the MD direction and the CD direction (expansion difference, distortion difference) of the upper and lower liners ).
WF = δ (610 / W) ² · (1/254)
^{= (610 2/254) ·} (ε / 8t)
However, δ = W ² ε / 8t, ε: upper and lower liner strain difference, t: corrugated board thickness, W: corrugated board width Therefore, if the sheet tension is a reference state, the sheet moisture state of each part, MD direction, and CD direction The correspondence relationship with the warpage state can be obtained and set in the prediction model.

In addition, the sheet adhesion failure is good if the temperature state at the bonding point is within an appropriate range, otherwise the sheet adhesion can be poor, and the correspondence between the temperature state of each part and the sheet adhesion failure The relationship can be determined and set in the prediction model.
In the present embodiment, there are various types of prediction models in which sheet moisture corresponds to sheet temperature, prediction models in which sheet adhesion failure corresponds to sheet temperature, and prediction models in which sheet warpage corresponds to sheet moisture. According to the production state (for example, paper width, flute, base paper composition and base paper basis weight), it is constructed using experiments or simulations, and is used as a knowledge database 26 as a database.

  The knowledge database 26 can be updated or augmented as necessary. That is, when it is determined that there is an error in the prediction result of the sheet moisture, sheet adhesion failure, and sheet warp by the soft sensor 24 (for example, when the control result based on the knowledge database 26 is not appropriate), the production state The necessary part of the knowledge database 26 can be updated by re-implementing the experiment or simulation and reconstructing the corresponding prediction model. In addition, the prediction model under the new production state can be strengthened in the knowledge database 26 by constructing a prediction model corresponding to the production state that is not stored in the knowledge database 26 by performing experiments or simulations. .

The other parts are configured in the same manner as in the first embodiment.
Since the corrugator control device according to the fourth embodiment of the present invention is configured as described above, the following effects can be obtained with respect to acquisition of sheet state information.
Since all information on sheet temperature, sheet moisture, sheet warpage, and sheet adhesion failure can be grasped, the corrugator can be operated so that sheet warpage and sheet adhesion failure do not occur.

In particular, according to the present apparatus, only the sheet temperature sensor is necessary, but the sheet moisture sensor, the sheet warpage sensor, and the sheet adhesion failure detection sensor are unnecessary, so that the apparatus cost and the maintenance burden of the apparatus are greatly reduced. is there.
In addition, since the knowledge database 26 storing various prediction models is used to estimate sheet moisture, sheet warpage, and sheet adhesion failure, the degree of freedom of the form of the prediction model stored in the knowledge database 26 is high. Since it can be configured as a partial linear model for each condition area, the entire production state area can be created as a set of partial linear models, even if it is a nonlinear prediction model. A highly accurate prediction is possible with a simple linear model.

Further, since all know-how and knowledge are stored in the knowledge database in the form of a prediction model, there is no missing or lost data, and the safety is excellent.
In particular, even if the estimated value is deviated, such as when the soft sensor does not work well, if the knowledge database 26 is updated by re-learning and the knowledge database 26 is updated, the soft sensor can be corrected and the practicality is improved. high.

  In addition, while installing a moisture sensor in the installation location of each temperature sensor 31a-31m, while a soft sensor acquires sheet | seat temperature information of each part of corrugator 1 from each temperature sensor, sheet moisture information of each part of corrugator 1 from each moisture sensor May be obtained and only the sheet warpage and the sheet adhesion failure may be estimated. That is, as described in the fourth embodiment, sheet warpage is predicted from sheet moisture, and sheet adhesion failure is predicted from sheet temperature.

  Therefore, the prediction model of the present embodiment does not include a prediction model related to the correspondence between the sheet temperature state and the moisture state, but the prediction model related to the correspondence between the sheet moisture state and the warp state, and the sheet temperature state. It has a prediction model related to the correspondence with the sheet adhesion failure. Therefore, the knowledge database 26 stores prediction model data regarding these prediction models.

  In this case, since the sheet temperature sensor and the sheet moisture sensor are installed, the effect of reducing the apparatus cost and the maintenance burden of the apparatus is reduced as compared with the first embodiment. Since the defect detection sensor is unnecessary, there is an effect that the apparatus cost and the maintenance burden of the apparatus are reduced. However, in the fourth embodiment, since the sheet warpage is predicted based on the predicted sheet moisture (prediction based on prediction), it is difficult to ensure the accuracy of prediction of the sheet warpage. Since sheet warpage is predicted based on this, there is an advantage that it is easy to ensure prediction accuracy. In addition, since modeling for predicting sheet moisture is not necessary as compared with the fourth embodiment, the preparation burden is reduced.

Further, instead of the soft sensor knowledge database 26 according to the fourth embodiment, a neural network (particularly, a hierarchical neural network) may be provided.
In this neural network, sheet temperature detection data of each part of the corrugator 1 from the temperature sensor is input to the input layer, and information on sheet moisture, sheet warpage, and sheet adhesion failure is output from the output layer via the intermediate layer. To do. In this neural network, an intermediate layer is constructed by learning in advance so as to obtain an appropriate output for an input by simulation or test, and a prediction model 25a for predicting sheet moisture from sheet temperature, and sheet moisture to sheet It has functions corresponding to a prediction model for predicting warpage and a prediction model for predicting sheet adhesion failure from sheet temperature.

In this case, unlike the knowledge database, it is not necessary to create and maintain a large amount of database, which is easy in terms of data management. In addition, since the neural network is suitable for learning update, the neural network can be learned and updated while using a machine to construct a more accurate neural network.
Further, the neural network receives sheet temperature detection data of each part of the corrugator 1 from the temperature sensor and sea moisture detection data of each part of the corrugator 1 from the moisture sensor in the input layer, and warps the sheet from the output layer through the intermediate layer. Information on defective sheet adhesion may be output.

  Further, in estimating the sheet state information, the knowledge database 26 and the neural network may be selected and used.

[E. Other]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, although not mentioned in the above embodiment, a genetic algorithm, linear regression, principal component regression, multiple regression, exact model by calculation, or the like is used instead of or together with the knowledge database 28 or the neural network 29. The correspondence relationship between the control amount for the state information, the production state information, and the environmental state information may be obtained.
As the prediction model used for the soft sensor, it may be possible to use a genetic algorithm, linear regression, principal component regression, multiple regression, exact model by calculation, and the like, and appropriately combine these with the knowledge database 26 and the neural network for prediction. You may make it apply to a model.

It is a block diagram which shows the control apparatus of the corrugator concerning 1st Embodiment of this invention. It is the schematic which showed the structure of the upper liner preheater of the corrugator concerning each embodiment of this invention, a single facer, and a center core preheater. It is the schematic which showed a partial structure of the single stage sheet | seat preheater, front liner preheater, glue machine, and double facer of the corrugator concerning each embodiment of this invention. It is the schematic which showed the structure of the double facer of the corrugator concerning each embodiment of this invention. It is a block diagram which shows the controller part of the control apparatus of the corrugator concerning 1st Embodiment of this invention. It is a figure explaining sheet curvature concerning each embodiment of the present invention. It is a figure explaining CD direction curvature of the sheet concerning each embodiment of the present invention. It is a figure explaining the ED direction curvature of the sheet concerning each embodiment of the present invention. FIG. 6 is a diagram illustrating sheet stacking warpage over time according to each embodiment of the present invention. It is a figure explaining control amount setting of the global optimizer concerning each embodiment of the present invention. It is a figure explaining control amount setting of the global optimizer concerning each embodiment of the present invention. It is a figure explaining control amount setting of the local optimizer concerning each embodiment of the present invention. It is a perspective view which shows the curvature simple model concerning each embodiment of this invention. It is a block diagram which shows the control apparatus of the corrugator concerning 3rd Embodiment of this invention. It is a block diagram which shows the controller part of the control apparatus of the corrugator concerning 2nd Embodiment of this invention. It is a block diagram which shows the control apparatus of the corrugator concerning 3rd Embodiment of this invention. It is a schematic diagram which shows the neural network concerning 3rd Embodiment of this invention. It is a block diagram which shows the control apparatus of the corrugator concerning 4th Embodiment of this invention. It is a block diagram which shows the control apparatus of the conventional corrugator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrugator 2 Production management apparatus 3 Upper (back) liner 4 Center core 5 Single-stage sheet (single-sided cardboard sheet)
6 Lower (table) liner 7 Double-sided sheet (double-sided cardboard sheet)
8 Single-sided sheet 11 Upper (back) liner preheater 12 Center core preheater 13 Single facer 14 Single stage preheater 15 Glue machine 16 Lower (table) Liner preheater 17 Double facer 17A Upstream heating section 17B Downstream Side cooling section 18 Slitter scorer 19 Cut-off 20 Stacker 21 Control amount calculation unit (global optimizer)
22 Process controller (local optimizer)
24 sheet state information acquisition means 24A soft sensor as sheet state information acquisition means 26, 28 knowledge database 29 neural network 30, 31 glue 31a-31m temperature sensor 111A, 111B back liner heating roll 112A, 112B winding amount adjustment device 113A, 113B Arm 114A, 114B, 115, 116 Guide roll 121 Core heating roll 122 Winding amount adjusting device 123 Arm 124 Guide roll 131 Belt roll 132 Tension roll 133 Pressure belt 134 Upper roll 135 Lower roll 136 Gluing device 136a Glue dam 136b Gluing roll 136c Meter roll 136d Paste scraping blade 137 Preheating roll for liner 138 Preheating roll for center core 141 Single-stage sheet heating roll 142 Winding amount adjusting device 143 Arm 145, 144 Guide roll 151 Gluing device 151a Glue dam 151b Gluing roll 151c Doctor roll 152 Pressure bar device 152a Pressure bar 152b Actuator 153, 154 Guide roll 155 Single stage preheating roll 161 Front liner heating roll 162 Winding Quantity adjusting device 163 Arm 164,165 Guide roll 171A First shower device (back liner wetting device)
171B Second shower device (front liner wetting device)
172 Heating plate 173 Pressure belt 174 Pressure unit 174a Pressure bar 174b Actuator

Claims (14)

In a corrugator that manufactures a corrugated cardboard sheet from a paper sheet, a corrugator control device that controls adjusting means for adjusting a plurality of adjusting elements of the corrugator based on one or a plurality of state information relating to the traveling paper sheet or the corrugated cardboard sheet There,
Status information acquisition means for acquiring the status information constantly or at a predetermined cycle;
Based on the latest status information acquired by the status information acquisition means, the control amount of the plurality of adjustment means is set constantly or at a predetermined cycle so that the status relating to the paper sheet or the corrugated cardboard sheet is appropriate. A corrugator control device comprising control means for controlling the plurality of adjusting means based on a set control amount. The control unit sets the control amount based on production status information and environmental status information of the corrugator in addition to the latest status information acquired by the status information acquisition unit. The corrugator control device described. The adjusting means includes
An actuator for adjusting the amount of winding of each sheet of the front liner, the back liner, and the core to the heating roll provided in the preheater of the corrugator;
An actuator for adjusting the heating steam pressure supplied to the heating roll;
An actuator for adjusting the sheet pressing force in the double facer of the corrugator;
An actuator for adjusting the heating steam pressure supplied to the double facer;
An actuator for adjusting a glue gap amount of a gluing device that is provided in the corrugator and glues the sheets;
An actuator that is provided in the corrugator and adjusts the amount of wetting by a wetting device for wetting each of the sheets or cardboard sheets;
An actuator for adjusting a braking force of a mill roll stand provided in the corrugator and supporting a roll of each sheet;
An actuator for adjusting the suction pressure of a single-stage sheet suction device provided in the corrugator;
The corrugator control device according to claim 1, comprising at least one of the following. The control means includes
A global optimizer that sets a feedforward amount of the control amount based on the latest state information, the production state information, and the environmental state information acquired by the state information acquisition unit;
A local optimizer that sets a feedback amount of the control amount according to a state of each of the adjustment elements, and sets the control amount by adding the feedback amount to a feedforward amount set by the global optimizer. The corrugator control device according to claim 2, wherein the corrugator control device is provided. 5. The global optimizer is connected to a knowledge database that associates the state information, the production state information, and the environmental state information with a feedforward amount of the control amount. The corrugator control device described. The global optimizer is connected to a neural network having the state information, the production state information, and the environmental state information as input elements and a feedforward component of the control amount as an output element. The corrugator control device according to claim 4. The corrugator control device according to claim 6, wherein the neural network is a hierarchical neural network. The corrugator control device according to any one of claims 1 to 7, wherein the state information is information relating to any one of sheet warpage and sheet adhesion failure. The state information acquisition means
Specific information detecting means for detecting specific state information among the plurality of state information;
Using the prediction model that is a correlation between the specific state information and the state information of the estimation target, from the specific state information detected by the specific information detection unit, other of the plurality of state information The corrugator control device according to any one of claims 1 to 7, further comprising an estimation unit that estimates state information of an estimation target that is information. The specific state information is a sheet temperature measurement value of the paper sheet or the cardboard sheet, and the specific information detection means is a temperature sensor,
10. The corrugator control device according to claim 9, wherein the state information to be estimated is information on any of sheet moisture, sheet warpage, and sheet adhesion failure of the paper sheet or the corrugated cardboard sheet. The specific status information is a sheet moisture of the paper sheet or the corrugated cardboard sheet, and the specific information detection means is a moisture sensor,
10. The corrugator control device according to claim 9, wherein the state information to be estimated is information relating to any one of sheet warp and sheet adhesion failure of the paper sheet or the corrugated cardboard sheet. The specific status information is a sheet temperature measurement value and a sheet moisture measurement value of the paper sheet or the cardboard sheet, and the specific information detection means is a temperature sensor and a moisture sensor,
10. The corrugator control device according to claim 9, wherein the state information to be estimated is information relating to any one of sheet warp and sheet adhesion failure of the paper sheet or the corrugated cardboard sheet. The information on the sheet warpage includes information on the warpage over time of the corrugated sheets stacked as a single sheet on a stacker at a downstream end of the corrugator. The corrugator control device according to claim 1. In a corrugator that manufactures a corrugated cardboard sheet from a paper sheet, a corrugator control method for controlling adjusting means for adjusting a plurality of adjusting elements of the corrugator based on one or a plurality of state information relating to the traveling paper sheet or the corrugated cardboard sheet There,
A state information acquisition step of acquiring the state information constantly or at a predetermined cycle;
A control amount that sets the control amount of the plurality of adjusting means at all times or in a predetermined cycle so that the state relating to the paper sheet or the cardboard sheet is appropriate based on the latest state information acquired by the state information acquisition step Configuration steps;
A corrugator control method comprising: a control step for controlling the plurality of adjusting means at all times or in a predetermined cycle based on the control amount set in the control amount setting step.

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