JP3905767B2 - Corrugated sheet warpage correction system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cardboard sheet warpage correction system that corrects the warpage in the width direction of a cardboard sheet (double-sided cardboard sheet) manufactured by a cardboard sheet manufacturing apparatus.
[0002]
[Prior art]
A corrugated cardboard sheet is produced by pasting the core that is fed to one liner (back liner) with glue to produce a single-stage sheet, and then bonding the other liner (front liner) to the center of the single-stage sheet. It is manufactured by producing a corrugated cardboard sheet and cutting the corrugated cardboard sheet into an appropriate length. In this manufacturing process, each sheet (back liner, front liner, single-stage sheet, cardboard sheet) is heated by each pre-heater and double facer such as a back liner pre-heater, single-stage sheet pre-heater, front liner pre-heater, etc. Gluing is performed by the machine, but if the heating amount and gluing amount are not appropriate values, the finished cardboard sheet has problems such as vertical warping in the width direction (hereinafter simply referred to as width warping) and poor bonding. Will occur. For example, if the moisture content of the back liner is excessive, it will be convex along the front liner side during drying, and if the moisture content of the front liner is excessive, it will be convex along the back liner side during drying. End up.
[0003]
Therefore, in the conventional production management system for corrugated cardboard sheets, each preheater winding amount, each gap amount between a single facer and a glue machine, based on production status information such as base paper composition, basis weight of used base paper, paper width, flute, By automatically adjusting the control elements such as the double facer pressurizing force by matrix control, the warp and the bonding failure of the corrugated cardboard sheet are suppressed to improve the quality. According to this system, even when a special base paper configuration or special processed base paper is used, it can be coped with by setting a matrix in advance.
[0004]
However, in exceptional production situations where the moisture content is different between the front and back liners with the same base paper configuration, or even when the moisture content is different even with the same type of base paper, each control element is controlled by the above system. Even if automatic adjustment is performed, the sheet temperature does not reach a predetermined appropriate temperature, and as a result, the corrugated cardboard sheet as a finished product may be warped.
[0005]
Conventionally, with regard to the warp that can occur due to such exceptional operation, the operator visually checks the warp state of the cardboard sheet and manually adjusts each of the above control elements based on the operator's own experience and know-how. It responded by.
[0006]
[Problems to be solved by the invention]
However, the adjustment method depending on experience and know-how as described above has a problem that the sheet quality varies depending on the skill level of the operator. In addition, even with the same operator, the adjustment may be repeated many times or may be erroneously operated, so that it is difficult to obtain a stable sheet quality. Furthermore, as described above, there are many control elements to be adjusted, and it is necessary to determine the adjustment amount after confirming the current amounts of these control elements, which is complicated and requires time for adjustment. There was also.
[0007]
The present invention was devised in view of such problems, and a corrugated sheet warping correction system that can correct the warpage in the width direction of the corrugated sheet accurately and easily without relying on the experience and know-how of the operator. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a warp correction system (hereinafter referred to as a system) for a corrugated cardboard sheet according to the present invention includes warp state information acquisition means, operation state information acquisition means, control element selection means, control amount calculation means, which will be described below. And a control means, and by using these components, the warpage in the width direction of the cardboard sheet manufactured by the cardboard sheet manufacturing apparatus is corrected.
[0009]
First, the warp state information acquisition means is means for acquiring information related to the warp state (vertical direction and size of warpage) of the corrugated board sheet manufactured by the corrugated sheet manufacturing apparatus, and the moisture content of the back liner and the front liner or The moisture content detecting means for detecting the parameters correlated with the moisture content, and the warpage of the cardboard sheet based on the information obtained by the moisture content detecting means. Judgment in stages Do Warpage determination Means and Warpage determination By means Judgment The obtained information is acquired as information on the warpage state of the cardboard sheet.
The moisture content detecting means may be configured to perform the detection at the entrance of a double facer that forms a corrugated cardboard sheet by laminating a back liner and a front liner on a core. You may comprise so that this detection may be performed at an exit. The moisture content detection means is, for example, a moisture sensor or a temperature sensor. Further, the moisture content detecting means preferably performs the detection along the width direction of the back liner and the front liner.
[0010]
The operating state information acquisition means is means for acquiring information relating to the operating state of the corrugated board manufacturing apparatus. The information on the operation state includes the operation speed, the amount of the sheet wound around each preheater, the vapor pressure of each preheater, the gap amount of each gluing device, the applied pressure and vapor pressure of the double facer, and the wet amount when a wet device is provided. Refers to various information such as
[0011]
The control element selection means includes a plurality of specific control elements that influence the moisture content of the back liner or the front liner among the control elements of the corrugated sheet manufacturing apparatus. Sheet Depending on the impact on the warpage of According to preset (predetermined) priority order, Means for selecting at least one specific control element. Specific control elements include the amount of heating of the back liner in the back liner heating means, the amount of gluing to the core in the single facer, the amount of heating of the single stage sheet in the single stage sheet heating means, and the amount of heating of the front liner in the front liner heating means Examples include control elements that control the amount of heating, the amount of glue applied to a single-stage sheet in a glue machine, the amount of heating of a corrugated board sheet in a double facer, and the like.
[0012]
The control amount calculation means is a means for calculating the control amount of the specific control element selected by the control element selection means based on the warpage state information of the cardboard sheet and the operating state of the cardboard sheet manufacturing apparatus.
The control means is means for controlling the specific control element selected by the control amount calculated by the control amount calculation means. More specifically, it is means for controlling each actuator corresponding to the specific control element such that the current amount of the specific control element becomes the control amount calculated by the control amount calculation means.
[0013]
With such a configuration, specific control elements that affect the warpage of the corrugated cardboard sheet are controlled according to the warpage state of the corrugated cardboard sheet obtained by the warp condition information acquisition means, so that it does not depend on the experience and know-how of the operator. The warp in the width direction of the corrugated cardboard sheet is corrected accurately and fully automatically.
[0014]
Also, The control element selection means is configured to sequentially select additional specific control elements in accordance with a predetermined priority order according to the warp size of the cardboard sheet. (That is, if the control element selection means determines that the degree of warpage of the corrugated cardboard sheet is in a stage where the warpage state determination means is small, one or more specific control elements are selected in order from the highest priority. As the degree of warping of the corrugated cardboard sheet selected and determined by the warpage state determination means increases, specific control elements are added sequentially according to the priority order so that the specific control elements calculated by the control amount calculation means increase. Select) The degree of correction can be increased in accordance with the magnitude of warpage, and the warpage of the cardboard sheet can be corrected more quickly. In particular, when the priority is set higher for a specific control element that has a greater effect on the warpage of the cardboard sheet, the warpage of the cardboard sheet can be corrected more quickly.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(A) First embodiment
FIG. 1 is a diagram showing an outline of a corrugated cardboard warpage correction system according to a first embodiment of the present invention. The warp correction system for a corrugated board sheet according to the present embodiment includes a corrugated board manufacturing apparatus 1 and a production management apparatus 2 that controls the corrugated board manufacturing apparatus 1.
[0016]
The corrugated board manufacturing apparatus 1 steps up a back liner preheater 10 that heats the back liner 20, a core preheater 12 that heats the core 21, and a core 21 heated by the core preheater 12 as main components. The single facer 11 for bonding the back liner 20 heated by the back liner preheater 10, the single sheet preheater 13 for heating the single sheet 22 formed by the single facer 11, and the front liner for heating the front liner 23. A pre-heater 14, a glue machine 15 for gluing to a single-stage sheet 22 heated by the single-stage sheet pre-heater 13, and a front liner 23 heated by the front liner pre-heater 14 are bonded to the single-stage sheet 22 glued by the glue machine 15. Double facer 16 forming double-sided sheet 24 A slitter scorer 17 for crease and grooving the cardboard sheet 24 formed by the facer 16, and the cardboard sheet 24 creased by the slitter scorer 17 are cut into divided plates to obtain a corrugated sheet (plate-like) as a final product. A cardboard sheet) 25 and a stacker 19 for stacking the cardboard sheets 25 in the order of completion.
[0017]
Among these constituent devices 10 to 19, a device that affects the moisture content of the back liner 20 and a device that affects the moisture content of the front liner 23 are devices related to the warpage in the width direction of the cardboard sheet 25. Yes, here, the back liner preheater 10, the single-stage sheet preheater 13, the front liner preheater 14, the single facer 11, the glue machine 15, and the double facer 16 are applicable. Hereinafter, detailed configurations of the devices 10, 11, 13 to 16 will be described with reference to FIGS. 2 is a schematic diagram showing the configuration of the back liner preheater 10, the single facer 11, and the core preheater 12. FIG. 3 is a partial view of the one-stage sheet preheater 13, the front liner preheater 14, the glue machine 15, and a part of the double facer 16. FIG. 4 is a schematic diagram showing the configuration of the double facer 16.
[0018]
As shown in FIG. 2, the back liner preheater 10 is provided with back liner heating rolls 101A and 101B arranged vertically in two stages. The back liner heating rolls 101A and 101B are heated to a predetermined temperature by supplying steam to the inside. The back liner 20 guided in order by the guide rolls 105, 104A, 106, 104B is wound around the peripheral surfaces of the back liner heating rolls 101A, 101B and preheated by the back liner heating rolls 101A, 101B.
[0019]
Of the guide rolls 105, 104A, 106, 104B, the guide roll 104A provided in the vicinity of one back liner heating roll 101A is the tip of an arm 103A that is swingably attached to the axis of the back liner heating roll 101A. The guide roll 104B provided in proximity to the other back liner heating roll 101B is supported at the tip of an arm 103B that is swingably attached to the shaft of the back liner heating roll 101B. Each arm 103A, 103B 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 104A, the arm 103A, and a motor (not shown), and the guide roll 104B, the arm 103B, and a motor (not shown) constitute the winding amount adjusting devices 102A and 102B, respectively.
[0020]
With such a configuration, in the back liner preheater 10, the vapor pressure supplied to the back liner heating rolls 101A and 101B and the winding amount of the back liner 20 on the back liner heating rolls 101A and 101B by the winding amount adjusting devices 102A and 102B ( The water content of the back liner 20 can be adjusted by the winding angle. Specifically, the greater the vapor pressure and the greater the amount of wrapping, the greater the amount of heat applied to the back liner 20 from the back liner heating rolls 101A, 101B, and the back liner 20 is dried and the water content is increased. Will drop.
[0021]
The single facer 11 includes a pressure belt 113 wound around a belt roll 111 and a tension roll 112, an upper roll 114 having a surface that is wavy and in contact with the pressure belt 113 in a pressurized state, A lower roll 115 having a wave-like surface and meshing with the upper roll 114 is provided. The back liner 20 heated by the back liner preheater 10 is wrapped around the liner preheating roll 117 and preheated on the way, and then guided by the belt roll 111 and together with the pressure belt 113, the pressure belt 113 and the upper roll. It is transferred to the nip part with 114. On the other hand, the intermediate core 21 heated by the intermediate core preheater 12 is wound around the intermediate core preheating roll 118 to be preheated, and after being wound around the meshing portion between the upper roll 114 and the lower roll 115, It is guided by the upper roll 114 and transferred to the nip portion between the pressure belt 113 and the upper roll 114.
[0022]
In the vicinity of the upper roll 114, a gluing device 116 is disposed. The gluing device 116 adjusts the amount of glue 30 attached to the peripheral surface of the gluing roll 116b, the gluing roll 116b gluing the gluing dam 116a storing the gluing 30, the middle core 21 conveyed by the upper roll 114, and the gluing roll 116b. It comprises a meter roll 116c and a glue scraping blade 116d that scrapes glue from the meter roll 116c. The core 21 that has been wound around the meshing portion of the upper roll 114 and the lower roll 115 is glued to each top of the stage by the glue roll 116b, and is attached to the back liner 20 at the nip portion between the pressure belt 113 and the upper roll 114. It is pasted together. Thereby, the single-stage sheet | seat 22 is formed.
[0023]
With such a configuration, in the single facer 11, the moisture content of the back liner 20 is determined by the gap amount between the gluing roll 116b and the upper roll 114 and the gap amount between the gluing roll 116b and the meter roll 116c. It can be adjusted. Specifically, as the gap amount is larger, the amount of glue on the bonding surface between the core 21 and the back liner 20 is increased, and the moisture content of the back liner 20 is increased by the moisture contained in the glue. Each gap amount can be adjusted by moving the gluing roll 116b or moving the meter roll 116c.
[0024]
The core preheater 12 has the same configuration as the back liner preheater 11, and a core heating roll 121 heated to a predetermined temperature by supplying steam therein, and a core to the core heating roll 121. And a winding amount adjusting device 122 that adjusts the winding amount (winding angle) 21. The winding amount adjusting device 122 includes a guide roll 124 around which the core 21 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.
[0025]
The single-stage sheet preheater 13 and the front liner preheater 14 are vertically arranged in two stages as shown in FIG. These preheaters 13 and 14 have the same configuration as the above-described back liner preheater 11.
The single-stage sheet preheater 13 includes a single-stage sheet heating roll 131 and a winding amount adjusting device 132. The single-stage sheet heating roll 131 is heated to a predetermined temperature by supplying steam therein. Around the circumferential surface of the single-stage sheet heating roll 131, the back liner 20 side of the single-stage sheet 22 guided in turn by the guide rolls 135 and 134 is wound and preheated by the single-stage sheet heating roll 131.
[0026]
The winding amount adjusting device 132 includes one guide roll 134, an arm 133 that is swingably attached to the shaft of the one-stage sheet heating roll 131 and supports the guide roll 134, and a motor (not shown) that rotates the arm 133. Has been. Then, the guide roll 134 is moved to an arbitrary position within the angle range indicated by the arrow in the figure by the control of the motor so that the winding amount (winding angle) of the single-stage sheet 22 around the single-stage sheet heating roll 131 can be adjusted. It has become.
[0027]
With such a configuration, in the single-stage sheet preheater 13, the moisture content of the back liner 20 is determined by the vapor pressure supplied to the single-stage sheet heating roll 131 and the winding amount (winding angle) of the single-stage sheet 22 around the single-stage sheet heating roll 131. 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 131 to the back liner 20, and the drying of the back liner 20 proceeds and the water content decreases. Will do.
[0028]
The front liner preheater 14 includes a front liner heating roll 141 and a winding amount adjusting device 142. The front liner heating roll 141 is heated to a predetermined temperature by supplying steam therein. A front liner 23 guided in turn by guide rolls 145 and 144 is wound around the peripheral surface of the front liner heating roll 141 and preheated by the front liner heating roll 141.
[0029]
The winding amount adjusting device 142 includes one guide roll 144, an arm 143 that is swingably attached to the shaft of the front liner 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 an arrow in the figure by controlling the motor so that the amount of winding (winding angle) of the front liner 23 around the front liner heating roll 141 can be adjusted. It has become.
[0030]
With such a configuration, in the front liner preheater 14, the moisture content of the front liner 23 depends on the vapor pressure supplied to the front liner heating roll 141 and the amount of winding (winding angle) of the front liner 23 around the front liner heating roll 141. 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 front liner heating roll 141 to the front liner 23, and the drying of the front liner 23 proceeds and the water content decreases. Will do.
[0031]
The glue machine 15 includes a gluing device 151 and a pressure bar device 152. The single-stage sheet 22 heated by the single-stage sheet preheater 13 is preheated by the single-stage preheating roll 155 and then guided in the glue machine 15 by the guide rolls 153 and 154 in order. The gluing device 151 is disposed below the travel line (the core 21 side) of the single-stage sheet 22 between the guide rolls 153 and 154, and the pressure bar device 152 is disposed above the travel line (the back liner 20 side). Has been.
[0032]
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 22, and a doctor roll 151c that is in contact with the gluing roll 151b and reversely rotates 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 22 between the pressure bar 151b and an actuator 152b that presses the pressure bar 152a toward the glue roll 151b. Yes. The single-stage sheet 22 is pressed toward 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 21. It has come to be. The single-stage sheet 22 glued to the middle core 21 is bonded to the front liner 23 by the double facer 16 in the next process.
[0033]
With such a configuration, in the glue machine 15, the moisture content of the front liner 23 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 22). It can be adjusted. Specifically, as the gap amount increases, the amount of glue on the bonding surface of the core 21 and the front liner 23 increases, whereby the amount of water added to the front liner 23 increases and the water content in the front liner 23 increases. Will increase. The gap amount can be adjusted by adjusting the position of the pressure bar 152a by the actuator 152b.
[0034]
The single-stage sheet 22 glued by the glue machine 15 is transferred to the double facer 16 of the next process. The front liner 23 heated by the front liner preheater 14 is also transferred to the double facer 16 through the glue machine 15. At that time, the front liner 23 is preheated from the liner preheating roll 156 while being guided by the liner preheating roll 156 disposed in the glue machine 15.
[0035]
At the entrance of the double facer 16, a first shower device (back liner wetting device) 161 </ b> A is disposed on the back liner 20 side along the travel line of the single-stage seat 22, and a second shower device ( (Front liner wetting device) 161B is arranged. These shower devices 161A and 161B are for adjusting the moisture content of the back liner 20 and the front liner 23, from the shower device 161A to the back liner 20, and from the shower device 161B to the front liner 23. Water is sprayed. And the moisture content of the back liner 20 increases according to the shower amount from the shower device 161A, and the moisture content of the front liner 23 increases according to the shower amount from the shower device 161B. The shower devices 161A and 161B are controlled independently of each other.
[0036]
In addition, temperature sensors (containing water content detection means) 40a and 40b are provided at the inlet of the double facer 16 (that is, immediately upstream of the double facer 16) so as to sandwich the conveying line of the single-stage sheet 22 and the front liner 23 from above and below. . Here, the temperature sensors 40 a and 40 b are arranged one by one so as to face the center in the width direction of the liners 20 and 23, and the upper temperature sensor 40 a is the upper surface of the single-stage sheet 22 just before being carried into the double facer 16. That is, the temperature T1 of the back liner 20 is detected as a parameter correlating with the moisture content of the back liner 20, and the lower temperature sensor 40 b correlates with the moisture content of the front liner 23 just before being carried into the double facer 16. The temperature T2 of the front liner 23 is detected as a parameter. As described later, the warpage state of the cardboard sheet is detected based on these temperatures.
[0037]
As shown in FIG. 4, the double facer 16 is divided into an upstream heating section 16 </ b> A and a downstream cooling section 16 </ b> B along the travel lines of the single-stage seat 22 and the front liner 23. Among these, the heating section 16 </ b> A is provided with a plurality of heating plates 162, and the front liner 23 passes over these heating plates 162. The hot platen 162 is heated to a predetermined temperature by supplying steam therein.
[0038]
In addition, a loop-shaped pressure belt 163 travels on the heating platen 162 in synchronism with the single-stage sheet 22 and the front liner 23 across the travel line. The pressure unit 164 is disposed so as to face the hot platen 162. The pressurizing unit 164 includes a pressurizing bar 164a that is in sliding contact with the back surface of the pressurizing belt 163, and an actuator 164b that presses the pressurizing bar 164a against the hot platen 162 side.
[0039]
The single-stage sheet 22 glued by the glue machine 15 is carried in between the pressure belt 163 and the heating platen 162 from the pressure belt 163 side. On the other hand, the front liner 23 heated by the front liner preheater 14 is preheated by the liner inlet preheating roll 165 and then carried between the pressure belt 163 and the hot platen 162 from the hot platen 162 side. Then, after the single-stage sheet 22 and the front liner 23 are carried between the pressure belt 163 and the heating platen 162, respectively, the single-stage sheet 22 and the front liner 23 are integrally transferred to the cooling section 16B in a state where they overlap each other. . During this transfer, the single-stage sheet 22 and the front liner 23 are heated from the side of the front liner 23 while being pressurized by the pressure unit 164 via the pressure belt 163, thereby being bonded to each other to form a cardboard sheet 24. The cardboard sheet 24 has its entire width or end cut by a rotary shear 166 provided at the outlet of the cooling section 16B, and is transferred to the slitter scorer 17 in the next step.
[0040]
With such a configuration, in the double facer 16, the moisture content of the front liner 23 can be adjusted by the vapor pressure supplied to the hot platen 162 and the pressurizing force of the pressurizing unit 164. Specifically, the greater the vapor pressure and the greater the applied pressure, the greater the amount of heat applied from the hot platen 162 to the front liner 23, and the drying of the front liner 23 proceeds and the water content decreases. become. The moisture content of the front liner 23 can also be adjusted by the speed at which the single-stage sheet 22 and the front liner 23 pass through the double facer 16. In this case, the slower the passing speed, the longer the time during which the front liner 23 is in contact with the hot platen 162, so that the drying of the front liner 23 proceeds and the water content decreases.
[0041]
The production management device 2 corrects the warp of the cardboard sheet 25 by appropriately controlling these devices 10, 11, 13 to 16. When attention is paid to the warp correction function of the corrugated cardboard sheet 25, the production management apparatus 2 includes a knowledge database 3, a control amount calculation unit 4, a process controller 5, and a warp state determination unit 8, as shown in FIG. Is done.
[0042]
The knowledge database 3 includes a control amount (adjustment amount from the current value) for a specific control element (specific control element) that affects the warpage of the corrugated cardboard sheet 25 among the control elements for controlling the corrugated board manufacturing apparatus 1. ) Or a setting equation for setting a control amount is stored corresponding to each warp state (warp direction and warp magnitude) of the cardboard sheet 25. Here, the specific control element is a control element that determines the moisture content of the back liner 20 and the front liner 23. Specifically, the back liner 20 is wound around the back liner heating rolls 101A and 101B described above. It is the amount, the amount of winding of the front liner 23 around the front liner heating roll 141, and the like.
[0043]
For example, when the corrugated cardboard sheet 25 is warped (convex to the front liner 23 side), each control element is configured to increase the moisture content of the front liner 23 or decrease the moisture content of the back liner 20. A control value set value or setting formula is defined. Conversely, when the corrugated cardboard sheet 25 is warped (convex on the back liner 20 side), each control is performed so as to increase the water content of the back liner 20 or decrease the water content of the front liner 23. A set value or setting formula for the control amount of the element is defined.
[0044]
Further, the setting value or setting formula of each control element is determined according to a predetermined priority order. Here, the priority is an output priority. For example, when the degree of warping is small, only the control element with a high priority is output, and as the degree of warping increases, It is defined that additional control elements are output. The priority is set higher for a control element that has a greater effect on warpage, in other words, for a control element that has higher power to correct warpage.
[0045]
FIG. 5 shows the configuration of the knowledge database 3 according to the present embodiment. Here, the warpage state of the corrugated cardboard sheet 25 is determined by a warpage state determination unit (detection unit) 8 to be described later. One of the seven types of warping and small downward warping is selected, and the control element to be output is determined according to the priority for each warping state. In the present embodiment, a single-stage sheet preheater winding amount (a single-stage sheet heating roll 131 winding amount), a front liner preheater winding amount (a front liner heating roll 141 winding amount), and a back liner The preheater winding amount (the winding amount of the back liner 20 around the back liner heating roll 101) is set as a control element (specific control element), and the one-stage sheet preheater winding amount and the front liner preheater winding amount are both priority 1, the back liner preheater. The winding amount is set to priority 3.
[0046]
In FIG. 5, control elements with circles (◯) or double circles (◎) are control elements that are output in the warped state. The circle and double circle indicate the amount of control (adjustment amount from the current value). When compared with the same control element, the double circle indicates that the control amount is greater than the circle. It is big. Therefore, in this embodiment, for example, when the warpage state of the corrugated cardboard sheet 25 is a small warpage, only the one-stage sheet preheater winding amount and the front liner preheater winding amount are adjusted, and when the warpage state is warping, Similarly, only the one-stage sheet preheater wrapping amount and the front liner preheater wrapping amount are adjusted, but the adjustment amount is increased. Further, when the warping state is large, the back liner preheater wrapping amount is also adjusted. . The specific set value or setting formula for each control element is determined by testing or simulation.
[0047]
Now, the warpage in the width direction of the corrugated cardboard sheet 25 occurs due to a difference in moisture content between the back liner 20 and the front liner 23 bonded together via the core 21. Therefore, the warpage state determination unit 8 is a parameter that correlates with the moisture content of the back liner 20 and correlates with the temperature T1 of the back liner 20 detected by the temperature sensor 40a and the moisture content of the front liner 23. The warpage state of the cardboard sheet 25 in the width direction is determined based on the temperature T2 of the front liner 23 detected by the temperature sensor 40b.
[0048]
The warp state determination method of the warp state determination unit 8 will be further described with reference to FIG. 6. The warp state determination unit 8 first has three levels of the temperatures T1 and T2 of the liners 20 and 23: high, normal, and low. Judge each. When the combination of the back liner temperature T1 and the front liner temperature T2 is (high, high), (normal, normal), or (low, low), the temperature difference between the back liner 20 and the front liner 23 As a result, since there is no difference in the moisture content, the corrugated cardboard sheet produced by bonding the liners 20 and 23 is predicted and determined not to warp (no warpage).
When the combination of the back liner temperature T1 and the front liner temperature T2 is (low, low) or (high, high), the back liner temperature T1 and the front liner temperature T1 are controlled by normal matrix control of the process controller 5 described later. Control is performed so that both the liner temperature T2 becomes normal.
[0049]
Further, when the temperature of the upper back liner 20 is higher than that of the front liner 23, that is, when the moisture content of the lower front liner 23 is higher than that of the back liner 20, the corrugated cardboard sheet is warped downward (back liner 20). (Convex on the side) is predicted and determined. The degree of warpage is predicted and determined according to the absolute value of the temperature difference ΔT between the liners 20 and 23. That is, when the back liner temperature T1 is high and the front liner temperature T2 is normal, it is estimated that the warp is being warped, and when the back liner temperature T1 is high and the front liner temperature T2 is low, the temperature difference ΔT. Therefore, when the back liner temperature T1 is normal and the front liner temperature T2 is low, the temperatures of the liners 20 and 23 are determined. Therefore, it is determined that the warp is smaller and the warpage is smaller than that during the warp.
[0050]
On the other hand, when the temperature of the lower front liner 23 is higher than that of the back liner 20, the warpage state determination unit 8 predicts / determines that the cardboard sheet warps upward (convex on the front liner 23 side), and the front liner When the temperature T2 is high and the back liner temperature T1 is normal, it is estimated that the warp is being warped. When the front liner temperature T2 is high and the back liner temperature T1 is low, the temperature difference ΔT increases. When the front liner temperature T2 is normal and the back liner temperature T1 is low, the temperature of the liners 20 and 23 is lower. It is determined that the warpage is smaller and the warpage is smaller than that during the warpage.
[0051]
The control amount calculation unit 4 searches the knowledge database 3 based on the warp information from the warp state determination unit 8. And the setting value or setting formula of the control amount of each applicable control element is read from the knowledge database 3, and each control amount according to the machine state (operation state) of the corrugated board manufacturing apparatus 1 is calculated. In the present embodiment, the control amount calculation unit 4 and the knowledge database 3 constitute a control element selection unit and a control amount calculation unit according to the present invention.
[0052]
The machine state refers to the operation speed of the corrugated cardboard sheet manufacturing apparatus 1 (sheet traveling speed), the amount of sheet wound around each of the heating rolls 101A, 101B, 131, 141, and the heating rolls 101A, 101B, 131, 141. Vapor pressure, gaps between the rolls 116b and 114 and the rolls 116b and 116c in the single facer 11, gaps between the glue roll 151b and the pressure bar 152a in the glue machine 15, and the pressure unit 164 in the double facer 16 It is the current values such as the pressure and the vapor pressure of the hot platen 162 and the shower amounts of the shower devices 161A and 161B. Such machine state information is input from a process controller 5 described later.
[0053]
When the warpage state determination unit 8 predicts / determines that there is no warp, the control amount calculation unit 4 sets all control elements to original values (production state such as base paper composition, basis weight of base paper used, paper width, flute, etc.) A command is sent to the process controller 5 to return to a value determined by matrix control based on information.
The process controller 5 comprehensively controls the devices 10 to 19 constituting the corrugated board manufacturing apparatus 1. Normally, the process controller 5 controls each of the devices 10 to 19 by matrix control based on the production status information. However, if the warpage state determination unit 8 predicts or determines that warpage occurs, the corresponding device is controlled. Control element (here, one of the one-stage sheet preheater winding amount in the single-stage sheet preheater 13, the front liner preheater winding amount in the front liner preheater 14, the back liner preheater winding amount in the back liner preheater 10 or a combination thereof). Control is performed using the control amount calculated by the amount calculation unit 4.
[0054]
When the warpage state determination unit 8 predicts / determines that the cardboard sheet 25 is not warped, the devices 10, 13, and 14 are controlled so that all control elements are returned to the original values. The process controller 5 always keeps track of the machine state of the corrugated board manufacturing apparatus 1 and outputs the current machine state to the control amount calculation unit 4 periodically or in response to a request from the control amount calculation unit 4. ing. That is, the process controller 5 functions as a control unit and an operation state information acquisition unit according to the present invention.
[0055]
FIG. 7 is a flowchart showing the function of the production management apparatus 2 described above in the form of a series of processes when correcting the warp of the cardboard sheet 25.
First, the production management device 2 checks the machine state in step S10, and checks the production state in step S20. Next, in step S30, temperature information of the back liner 20 and the front liner 23 is acquired via the temperature sensors 40a and 40b. In step S40, the warpage state of the cardboard sheet 25 is predicted and determined based on the temperature information as described above, and the presence or absence of warpage of the cardboard sheet 25 is determined in step S50 based on the result. If there is a warp, the process proceeds to step S60, and control elements to be controlled according to the priority order according to the warp state (here, one of the one-stage sheet preheater winding amount, the front liner preheater winding amount, and the back liner preheater winding amount) Any one or a combination thereof).
[0056]
Subsequently, in step S70, the control amount corresponding to the machine state information acquired in step S10 is calculated with reference to the knowledge database 3 for the selected control element. At this time, the production state information acquired in step S20 may be used as reference data, such as changing the winding amount depending on the difference in the base paper configuration (thick paper, thin paper). In step S80, the calculated control amount is output to the corresponding device (here, one of the single-stage sheet preheater 13, the front liner preheater 14, the back liner preheater 10, or a combination thereof).
On the other hand, if it is determined in step S50 that the cardboard sheet 25 is not warped, normal matrix control is performed.
[0057]
As described above, according to the warp correction system for a corrugated cardboard sheet according to the present embodiment, the warpage state of the corrugated cardboard sheet 25 manufactured by the corrugated cardboard sheet manufacturing apparatus 1 is automatically determined, and the single-stage sheet that affects the warpage of the corrugated cardboard sheet 25. Since the preheater winding amount, front liner preheater winding amount, and back liner preheater winding amount are adjusted by the production management device 2, the warpage of the corrugated cardboard sheet 25 is corrected accurately and fully automatically without relying on the experience and know-how of the operator. can do.
[0058]
In the feedback control that detects the state of the warp actually generated in the corrugated cardboard sheet 25 and corrects the warp based on the detected state, when the corrugated cardboard sheet is in a short order (when the product specifications of the corrugated cardboard sheet can be switched in a short period of time), feedback is performed. The liners 20 and 23 that are in a short order rather than being controlled pass through a device that can correct the warp (in this case, the one-stage sheet preheater 13, the front liner preheater 14, and the back liner preheater 10) and warp. There is a possibility that it cannot be corrected. However, according to the warp correction system described above, the warpage state of the corrugated cardboard sheet 25 is predicted and determined based on the temperatures of the liners 20 and 23 before bonding, and warpage correction control is performed early based on this result. Therefore, there is an advantage that warpage can be suppressed even for a short order.
[0059]
In addition, during the warp correction control, the production management device 2 sequentially selects additional control elements according to a predetermined priority order according to the warp size of the corrugated cardboard sheet 25, and accordingly, according to the warp size. The degree of correction can be increased, and the warp of the cardboard sheet 25 can be corrected quickly. In particular, the warpage of the corrugated cardboard sheet 25 can be corrected more quickly by setting the priority higher as the control element having a greater influence on the warpage of the corrugated cardboard sheet 25 as in the present embodiment.
[0060]
In the first embodiment, the case where the warp of the corrugated cardboard sheet 25 is corrected using the one-stage sheet preheater winding amount, the front liner preheater winding amount, and the back liner preheater winding amount as control elements has been described, but this is only an example, You may increase the kind of control element which should be controlled like the following 2nd-5th embodiment.
[0061]
(B) Second embodiment
FIG. 8 shows the configuration of the knowledge database 3 according to the second embodiment of the present invention. Since the configuration other than the knowledge database 3 is the same as that of the first embodiment, the description thereof is omitted.
In the present embodiment, the single facer 11 and the glue machine 15 are also controlled objects during the warp correction. In addition to the control elements in the first embodiment, a new single facer glue gap amount (a gluing roll 116b and an upper stage) is newly added. The gap amount between the roll 114 (or the gap amount between the gluing roll 116b and the meter roll 116c)) and the glue machine glue gap amount (the gap amount between the gluing roll 151b and the pressure bar 152a) are specific control elements. Is set as As in the first embodiment, both the one-stage sheet preheater winding amount and the front liner preheater winding amount are given priority order 1, the back liner preheater winding amount is given priority order 3, and the single facer glue gap amount is given priority order 4, The machine glue gap amount is given priority 5.
[0062]
Therefore, according to the cardboard sheet warpage correction system according to the present embodiment, the control elements are increased as compared with the first embodiment as described above, thereby enabling finer control than the first embodiment, and more accurate. In addition, the warp of the cardboard sheet 25 can be corrected.
[0063]
(C) Third embodiment
FIG. 9 shows the structure of the knowledge database 3 according to the third embodiment of the present invention. Since the configuration of the present embodiment is the same as that of the first embodiment except for the knowledge database 3, the description thereof is omitted.
In the present embodiment, the double facer 16 is also an object to be controlled during warp correction. In addition to the control elements in the second embodiment, a new double facer pressurizing force (pressing force of the pressurizing unit 164) and a double facer speed (single stage) are provided. The passing speed of the seat 22 and the front liner 23 on the double facer 16) is set as a specific control element. As in the second embodiment, the one-stage sheet preheater winding amount and the front liner preheater winding amount are both priority order 1, the back liner preheater winding amount is priority order 3, the single facer glue gap amount is priority order 4, and the glue machine glue. The gap amount is given priority 5, the double facer pressure is given priority 6, and the double facer speed is given priority 7.
[0064]
Therefore, according to the warp correction system for a corrugated board sheet according to the present embodiment, the control elements are further increased as compared with the second embodiment as described above, thereby enabling finer control than the second embodiment. The warp of the cardboard sheet 25 can be corrected accurately.
[0065]
(D) Fourth embodiment
FIG. 10 shows the configuration of the knowledge database 3 according to the fourth embodiment of the present invention. Since the configuration of the present embodiment is the same as that of the first embodiment except for the knowledge database 3, the description thereof is omitted.
[0066]
In the present embodiment, in addition to the control elements in the third embodiment, a double facer vapor pressure (a vapor pressure supplied to the hot platen 162) is newly set as the specific control element. As in the third embodiment, the single-stage sheet preheater winding amount and the front liner preheater winding amount are both priority 1, the back liner preheater winding amount is priority 3, the single facer glue gap amount is priority 4, and the glue machine glue. The gap amount is given priority 5, the double facer pressure is given priority 6, the double facer vapor pressure is given priority 7, and the double facer speed is given priority 8.
[0067]
Therefore, according to the warp correction system for the corrugated cardboard sheet according to the present embodiment, the control elements are further increased as compared with the third embodiment as described above, thereby enabling finer control than the third embodiment. The warp of the cardboard sheet 25 can be corrected more accurately.
[0068]
(E) Fifth embodiment
FIG. 11 shows the structure of the knowledge database 3 according to the fifth embodiment of the present invention. Since the configuration of the present embodiment is the same as that of the first embodiment except for the knowledge database 3, the description thereof is omitted.
[0069]
In the present embodiment, the shower devices 161A and 161B are also controlled when warping is corrected, and in addition to the control elements in the fourth embodiment, a new back liner side shower amount (shower amount from the shower device 161A) and The front liner shower amount (shower amount from the shower device 161B) is set as the specific control element. In this embodiment, each of these shower amounts is given priority order 1, and hereinafter, both the one-stage sheet preheater winding amount and the front liner preheater winding amount are priority 2, the back liner preheater winding amount is priority 4, and the single facer. The glue gap amount has priority 5, the glue machine glue gap amount has priority 6, the double facer pressure is priority 7, the double facer steam pressure is priority 8, and the double facer speed is priority 9.
[0070]
Therefore, according to the warp correction system for a corrugated cardboard sheet according to this embodiment, the control elements are further increased as compared with the fourth embodiment as described above, thereby enabling finer control than the fourth embodiment. The warp of the cardboard sheet 25 can be corrected more accurately. Moreover, the warp of the corrugated cardboard sheet 25 can be corrected more quickly by adding a control element having a higher correction force than the shower amount.
[0071]
(F) Sixth embodiment
Next, a sixth embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized by the moisture content detection means, and the other configuration is the same as that of the first embodiment. The knowledge database 3 may use any of the first to fifth embodiments.
[0072]
In each of the above-described embodiments, the temperature sensors 40a and 40b are provided as the moisture content detection means, whereas in the corrugated sheet warpage correction system of the present embodiment, the single-stage sheet 22 and the moisture content detection means are provided. Moisture sensors 41 a and 41 b are provided at the entrance of the double facer 16 as shown in FIG. 12 so as to sandwich the conveying line of the front liner 23 from above and below. These moisture sensors 41a and 41b are provided one by one so as to face the center of the liners 20 and 23 in the width direction.
[0073]
Then, as shown in FIG. 13, the warpage state determination unit 8 divides the moisture contents M1 and M2 of the single-stage sheet 22 and the front liner 23 into three levels of high, normal, and low, respectively, and combinations of these levels. Based on the above, the warp of the corrugated cardboard sheet 25 is predicted and determined. Specifically, when the combination of the content moisture M1 and M2 is (low, low), (normal, normal), or (high, high), the moisture content between the single-stage sheet 22 and the front liner 23 Since there is no difference, it is predicted and judged that there is no warp.
In addition, when the combination of the above-mentioned moisture contents M1 and M2 is (low, low) or (high, high), the moisture contained in the single-stage sheet 22 and the front liner 23 by the normal matrix control of the process controller 5 The amount is adjusted so that both are normal.
[0074]
Further, when the content moisture content of the back liner 20 is higher than that of the front liner 23, it is predicted / determined that the cardboard sheet 25 warps, and the content moisture content M1 of the back liner 20 is normal and the front liner 23 is normal. When the moisture content M2 of the front liner 23 is low, during warping, the moisture content M1 of the back liner 20 is high and when the moisture content M2 of the front liner 23 is low, the warping is large. When the content water content M1 of the liner 20 is high and the content water content M2 of the front liner 23 is normal, it is determined that the warpage is small.
[0075]
On the other hand, if the content moisture content of the back liner 20 is lower than that of the front liner 23, it is predicted and determined that the cardboard sheet 25 warps, and the content moisture content M1 of the back liner 20 is low and the front liner 23 When the content water content M2 of the front liner 23 is normal, the back liner 20 is low in warpage, and when the content water content M1 of the back liner 20 is low and the content water content M2 of the front liner 23 is high, the back warping is large. When the content water content M1 of the liner 20 is normal and the content water content M2 of the front liner 23 is high, it is determined that the downward warping is small.
[0076]
Then, the control amount calculation unit 4 searches the knowledge database 3 on the basis of the warpage information from the warp state determination unit 8, as in the above embodiments, and sets the control amount set value or the corresponding control element. The setting formula is read out. The process controller 5 controls the control element with the control amount calculated by the control amount calculation unit 4.
Since other configurations are the same as those of the above-described embodiments, description thereof will be omitted.
[0077]
Therefore, according to the cardboard sheet warpage correction system as the sixth embodiment of the present invention, the warpage of the cardboard sheet 25 can be quickly corrected as in the above-described embodiments, and the warpage is corrected even for short orders. be able to.
[0078]
(G) Seventh embodiment
Next, a seventh embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in the arrangement of the moisture content detecting means, and the other configuration is the same as that of the first embodiment. The knowledge database 3 may use any of the first to fifth embodiments. In the first to fifth embodiments described above, the temperature sensors 40a and 40b as the moisture content detection means are provided at the entrance of the double facer 16, whereas in the corrugated cardboard sheet warpage correction system of the present embodiment, these are provided. The temperature sensors 40a and 40b are provided at the outlet of the double facer 16 (that is, directly downstream of the double facer 16).
[0079]
Therefore, according to the cardboard sheet warpage correction system as the seventh embodiment of the present invention, for example, the warpage state of the cardboard sheets 25 loaded on the stacker 19 is acquired, and various control elements are feedback-controlled based on this. Since the acquisition of the warpage state is performed on the upstream side of the corrugated board sheet manufacturing process, the warp correction control is performed earlier, and it is possible to cope with a short order. There is.
[0080]
As the moisture content detection means, moisture sensors 41a and 41b may be provided at the outlet of the double facer 16 as shown in FIG. 15 instead of the temperature sensors 40a and 40b. In this case, the warpage state determination unit 8 determines the warpage state based on the moisture contents M1 and M2 contained in the single-stage sheet 22 and the front liner 23 as shown in FIG. 13, as in the sixth embodiment described above.
[0081]
(H) Other
The seven embodiments of the present invention have been described above. However, 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.
[0082]
For example, in the above-described embodiment, the vapor pressure supplied to each heating roll 101, 131, 141 is not used as a specific control element. Of course, even if these control elements are used, the warpage of the cardboard sheet 25 can be corrected. it can. Further, not limited to those exemplified here, any control element that affects the moisture content of the back liner 20 or the moisture content of the front liner 23 can be used to correct the warpage of the cardboard sheet 25 as a specific control element. Can be used. Therefore, the configuration of the knowledge database 3 described in the first to seventh embodiments is merely an example, and may be configured according to the specific control element to be used. Further, the priority order is not limited to the order of the above-described embodiment, and can be arbitrarily set.
[0083]
In the above embodiment, the warpage state determination unit 8 determines the degree of warping in three stages of large, medium, and small, but the warpage state may be determined more finely. Thereby, the curvature of the cardboard sheet 25 can be corrected more accurately.
[0084]
Moreover, in the said embodiment, although either a temperature sensor or a moisture sensor is used as a moisture content detection means, two sensors, a temperature sensor and a moisture sensor, are provided for each of the liners 20 and 23, respectively. Also good. In this case, the detection value of one of the temperature sensor and the moisture sensor may be used for the determination of the warpage state, and the other detection value may be used as reference information not related to the determination of the warpage state. The warpage state may be determined based on the detection value of the sensor.
[0085]
Further, in the above embodiment, the moisture content detecting means (temperature sensor or moisture sensor) is provided at the center in the width direction of the liners 20 and 23 so that the moisture content at the center of each liner 20 and 23 is detected as a representative value. However, the moisture content may be detected along the width direction of the liners 20 and 23 by the moisture content detection means. Specifically, a plurality of fixed moisture content detecting means can be provided at the same height along the width direction for each of the liners 20 and 23, or one contained moisture content detecting means can be moved along the width direction. It may be configured to scan the moisture content. In this case, the detection results along the width direction may be averaged to obtain a representative value of the water content of the liners 20 and 23.
Thereby, even when the distribution of the moisture content in the liners 20 and 23 varies in the width direction, the warped state can be accurately determined.
[0086]
【The invention's effect】
As described above in detail, according to the warp correction system for a corrugated cardboard sheet according to the present invention, a specific control element that affects the warp of the corrugated cardboard sheet is controlled according to the warp state of the manufactured corrugated cardboard sheet. There is an effect that the warp in the width direction of the corrugated cardboard sheet can be corrected accurately and fully automatically without relying on the experience and know-how.
[0087]
In particular, the moisture content detection means detects the moisture content of the single-stage sheet and the front liner at the inlet and outlet (preferably the inlet) of the double facer, and performs control to correct warpage in the width direction of the cardboard sheet based on this. Thus, this control can be performed at an early stage, and the warp can be corrected even for a short order.
Also Depending on the warp size of the cardboard sheet, additional specific control elements are sequentially selected according to a predetermined priority order. Because The degree of correction can be increased according to the amount of warpage, the warpage of the corrugated cardboard sheet can be corrected more quickly, and the priority is given to a specific control element that has a greater effect on the warpage of the corrugated cardboard sheet. When it is set high, the warp of the cardboard sheet can be corrected more quickly.
[0088]
Further, if the moisture content detection means is configured to perform the detection along the width direction of the back liner and the front liner, even if the moisture content of the back liner and the front liner varies. Based on the detection result, the warpage state can be accurately determined.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a warp correction system for a corrugated cardboard sheet according to a first embodiment of the present invention.
FIG. 2 is a schematic view showing a configuration of a back liner preheater, a single facer, and a core preheater of the corrugated board manufacturing apparatus.
FIG. 3 is a schematic view showing a partial configuration of a single-stage sheet preheater, a front liner preheater, a glue machine, and a double facer of a corrugated board manufacturing apparatus.
FIG. 4 is a schematic view showing a configuration of a double facer of the corrugated board manufacturing apparatus.
FIG. 5 is a diagram showing a configuration of a knowledge database according to the first embodiment of the present invention.
FIG. 6 is a diagram showing a configuration of a warpage state determination unit according to the first embodiment of the present invention.
FIG. 7 is a flowchart showing a flow of warp correction processing according to the first embodiment of the present invention.
FIG. 8 is a diagram showing a configuration of a knowledge database according to the second embodiment of the present invention.
FIG. 9 is a diagram showing a configuration of a knowledge database according to the third embodiment of the present invention.
FIG. 10 is a diagram showing a configuration of a knowledge database according to a fourth embodiment of the present invention.
FIG. 11 is a diagram showing a configuration of a knowledge database according to a fifth embodiment of the present invention.
FIG. 12 is a diagram showing an outline of a warp correction system for a corrugated cardboard sheet as a sixth embodiment of the present invention.
FIG. 13 is a diagram illustrating a configuration of a warpage state determination unit according to a sixth embodiment of the present invention.
FIG. 14 is a diagram showing an outline of a warp correction system for a corrugated cardboard sheet as a seventh embodiment of the present invention.
FIG. 15 is a diagram showing an outline of a modified example of the cardboard sheet warpage correction system according to the seventh embodiment of the present invention;
[Explanation of symbols]
1. Corrugated cardboard sheet manufacturing equipment
2 Production management device
3 Knowledge Database
4 Control amount calculator
5 Process controller
6 Warpage state input section
8 Warpage state determination unit
10 Back liner preheater
11 Single facer
12 Core pre-heater
13 Single-stage sheet preheater
14 Table liner preheater
15 Glue machine
16 Double facer
17 Slitter Scorer
18 Cut-off
19 Stacker
20 Back liner
21 core
22 Single seat
23 Table liner
24 Corrugated cardboard sheet
25 Corrugated cardboard sheet (Product)
40a, 40b Temperature sensor (moisture content detection means)
41a, 41b Moisture sensor (moisture content detection means)
101A, 101B Back liner heating roll
102A, 102B Winding amount adjusting device
114 Upper roll
116 Gluing device
116b Gluing roll
116c meter roll
131 Single-stage sheet heating roll
132 Winding amount adjusting device
141 Table liner heating roll
142 Winding amount adjusting device
151 Gluing device
151b Gluing roll
152 Pressure Bar Device
152a Pressure bar
161A, 161B Shower device
162 Hot plate
163 Pressure belt
164 Pressure unit
164a Pressure bar
191 Conveyor
192 Stack part

Claims (9)

A warpage correction system that corrects the warpage of a corrugated cardboard sheet manufactured by a corrugated cardboard manufacturing apparatus,
Warpage state information acquisition means for acquiring information on the warpage state of the cardboard sheet manufactured by the cardboard sheet manufacturing apparatus;
Driving state information acquisition means for acquiring information relating to the driving state of the corrugated board manufacturing apparatus;
Among the control elements of the corrugated sheet manufacturing apparatus, among the plurality of specific control elements that affect the moisture content of the back liner or the front liner, the warpage state of the corrugated cardboard sheet and each specific control element are related to the warpage of the corrugated sheet. A control element selecting means for selecting at least one specific control element according to a preset priority order according to the influence exerted;
Control amount calculation means for calculating a control amount of the selected specific control element based on the warpage state information of the cardboard sheet and the operation state information of the corrugated sheet manufacturing apparatus;
Control means for controlling the selected specific control element with the control amount calculated by the control amount calculation means,
The warpage state information acquisition means is obtained by the moisture content detection means for detecting the moisture content of the back liner and the front liner or a parameter correlated with the moisture content, and the moisture content detection means. A warp state determination means for determining the warpage of the corrugated cardboard sheet step by step based on the information, and acquiring the information determined by the warpage state determination means as information on the warpage state of the cardboard sheet,
The control element selection means, when the warpage state determination means determines that the degree of warpage of the corrugated cardboard sheet is in a small stage, the one or more specific control elements in order from the highest priority As the degree of warpage of the corrugated cardboard sheet determined by the warpage state determination means increases, the specific control elements are sequentially added according to the priority order, and the specificities calculated by the control amount calculation means A warp correction system for corrugated cardboard sheets, wherein the control elements are selected to increase. 2. The warpage correction system for a corrugated cardboard sheet according to claim 1, wherein the priority is set higher for a specific control element having a larger influence on the warpage of the corrugated cardboard sheet. The corrugated cardboard manufacturing apparatus includes a double facer that forms the corrugated cardboard sheet by bonding the one-stage sheet having the back liner bonded to the core and the front liner.
The warping correction system for a corrugated cardboard sheet according to claim 1 or 2, wherein the moisture content detecting means performs the detection at the entrance of the double facer. The corrugated cardboard manufacturing apparatus includes a double facer that forms the corrugated cardboard sheet by bonding the one-stage sheet having the back liner bonded to the core and the front liner.
3. The warp correction system for a corrugated cardboard sheet according to claim 1, wherein the moisture content detection means performs the detection at the outlet of the double facer. The corrugated board manufacturing apparatus is
Back liner heating means for heating the back liner;
A single facer that forms a one-stage sheet by laminating and gluing the middle core, and bonding the back liner heated by the back liner heating means to the core;
A single-stage sheet heating means for heating the single-stage sheet formed by the single facer;
A surface liner heating means for heating the surface liner;
A glue machine for gluing the single-stage sheet heated by the single-stage sheet heating means;
And said double facer for forming a stepped ball seat by bonding the said surface liner heated by該片stage sheet and said surface liner heating means is glued with the glue machine,
A back liner wetting device disposed at the entrance of the double facer and sprayed with water toward the back liner;
A front liner wetting device that is disposed at the entrance of the double facer and injects water toward the front liner;
As the specific control element, the amount of water shower of the back liner wetting device, the amount of water shower of the front liner wetting device, the amount of heating of the one-stage sheet in the one-stage sheet heating means, and the front liner in the front liner heating means Heating amount of the back liner in the back liner heating means, amount of gluing to the core in the single facer, amount of gluing to the single sheet in the glue machine, to the corrugated cardboard sheet in the double facer pressure, the vapor pressure of the stepped ball seat in said double facer, and, wherein the double facer speed is the speed of該片stage sheet and said surface liner passing through the double facer and the like, according to claim 3 or 4, wherein Corrugated sheet warpage correction system. The priority of the specific control element is as follows: the amount of water showered by the back liner wetting device, the amount of water showered by the front liner wetting device, the amount of heating of the one-stage sheet in the one-stage sheet heating means, and the front liner heating means The amount of heating of the front liner in the above, the amount of heating of the back liner in the means for heating the back liner, the amount of gluing to the core in the single facer, the amount of gluing to the single sheet in the glue machine, the amount of gluing in the double facer 6. The warpage correction system for a corrugated cardboard sheet according to claim 5 , wherein the pressure applied to the corrugated cardboard sheet, the vapor pressure applied to the corrugated cardboard sheet in the double facer, and the double facer speed are set in this order. The warpage correction system for a corrugated cardboard sheet according to any one of claims 1 to 6 , wherein the moisture content detection means performs the detection along the width direction of the back liner and the front liner, respectively. . The warp correction system for a corrugated cardboard sheet according to any one of claims 1 to 7 , wherein the moisture content detecting means is a moisture sensor. The warp correction system for a corrugated cardboard sheet according to any one of claims 1 to 7 , wherein the moisture content detecting means is a temperature sensor.

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