JP2003266568A - Warpage-correcting system for corrugated board sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately and easily correct twist warpage of a corrugated board sheet without relying on the experience or know-how of an operator by this warpage-correcting system for corrugated board sheets. <P>SOLUTION: Based on warped state information of the corrugated board sheet 25 and operating state information of a corrugated board sheet- manufacturing apparatus 1, a control amount of a specified control element, which affects the distribution in the sheet width direction of tension in the sheet-flow direction of a single faced corrugated board sheet 22 or a surface liner 23 and is one of the control elements of the corrugated board sheet- manufacturing apparatus 1, is computed. Then, the selected specified control element is controlled by the computed control amount. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cardboard sheet warp straightening system for correcting a twist warp of a corrugated cardboard sheet (double-sided corrugated board sheet) manufactured by a corrugated board sheet manufacturing apparatus.

[0002]

2. Description of the Related Art In a corrugated cardboard sheet, one liner (back liner) is laminated with glued cores to form a one-stage sheet, and the other side liner (front liner) is attached to the core side of the one-stage sheet. A corrugated cardboard sheet is manufactured by laminating the above, and the corrugated cardboard sheet is cut into an appropriate length. In this manufacturing process, if the distribution of the tension in the flow direction of each sheet (hereinafter also simply referred to as the tension) in the sheet width direction is biased against the appropriate distribution, the corrugated cardboard sheet will twist and warp. Will end up.

Generally, the optimum tension distribution (tension distribution in which no twist reaction occurs) is a uniform tension distribution along the sheet width direction, but the direction of the fibers forming the sheet is the sheet conveying direction. If the tension distribution is inclined with respect to, even if the tension distribution is uniform along the sheet width direction, the distribution is relatively biased in the width direction with respect to the optimum distribution, and twist warpage occurs. .

Conventionally, with respect to such twist warp, the operator visually checks the warp state of the corrugated cardboard sheet and based on the experience and know-how of the operator himself, the sheet width direction distribution of the tension in the sheet flow direction of the one-step sheet or the front liner. Each element (for example, the inclination angle of the pressure roll of the double facer with respect to the sheet conveying direction) is manually adjusted individually.

[0005]

However, in the adjustment method that relies on experience and know-how as described above, there is a problem that the sheet quality varies depending on the skill level of the operator. Further, even the same operator may repeat the adjustment many times or may make an erroneous operation, so that it is difficult to obtain stable sheet quality. Further, as described above, there are a plurality of control elements to be adjusted, and the adjustment amount must be determined after checking the current amounts of these control elements, which makes the operation complicated and requires time for adjustment. There were also challenges.

The present invention was devised in view of the above problems, and it is possible to accurately and easily correct the twist warp of the corrugated cardboard sheet without relying on the experience and know-how of the operator. The purpose is to provide a system.

[0007]

In order to achieve the above object, a corrugated board sheet warp correction system (hereinafter referred to as a system) of the present invention comprises a warp state information acquisition means, an operation state information acquisition means, and a control described below. The present invention is characterized by including a quantity calculation means and a control means, and correcting twist twist of a corrugated board sheet manufactured by a corrugated board sheet manufacturing apparatus by using each of these components.

First, the warp state information obtaining means is a means for obtaining information about the twist warp state (twist warp pattern and size) of the corrugated board sheet manufactured by the corrugated board sheet manufacturing apparatus. The information acquisition method may be manual input or automatic acquisition by the operator. In the case of manual input by the operator, for example, the operator is allowed to select any one of a plurality of options indicating the state of twist warp of the corrugated cardboard sheet. It is preferable that the selection means is provided, and the option selected by the selection means is acquired as information regarding the state of twist warp of the corrugated board sheet.

On the other hand, in the case of automatic acquisition, for example, the image pickup means for picking up the four corners of the corrugated board sheet manufactured by the corrugated board sheet manufacturing apparatus, and the twist warp of the corrugated board sheet are detected based on the image information obtained by the image pickup means. It is preferable that the information processing device further includes a detection unit, and the information detected by the detection unit is acquired as information regarding the state of twist warp of the corrugated board sheet.

Alternatively, the displacement amount measuring means for detecting the vertical displacement amounts near the four corners of the corrugated board sheet manufactured by the corrugated board sheet manufacturing device, and the twist warp of the corrugated board sheet based on the displacement amount information obtained by the displacement amount measuring means. It may be configured to include a detection unit for detecting the information, and to obtain the information detected by the detection unit as information regarding the state of twist warp of the corrugated cardboard sheet.

The operating state information acquiring means is a means for acquiring information regarding the operating state of the corrugated board sheet manufacturing apparatus. The information on the operating state is the operating speed, the distribution of the pressing angle of the double facer with respect to the sheet width direction and the sheet width direction distribution of the pressing force, the height position of both shaft ends of the winding roll before the double facer, and the single-stage sheet. It refers to various information such as information on the distribution of the suction force of the provided suction brake in the seat width direction.

The control amount calculation means is a means for calculating the control amount of the specific control element based on the warp state information of the corrugated board sheet and the operating state of the corrugated board sheet manufacturing apparatus. As the specific control elements, the inclination angle of the pressure roll of the double facer with respect to the sheet width direction and the sheet width direction distribution of the pressing force, the height position of both shaft ends of the winding roll before the double facer, and the suction provided for the single-stage sheet This is the distribution of the suction force of the brake in the seat width direction.

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 a means for controlling each actuator corresponding to the specific control element so that the current amount of the specific control element becomes the control amount calculated by the control amount calculation means. With such a configuration, the specific control elements that affect the warp of the corrugated cardboard sheet are automatically controlled according to the twisted warp state of the corrugated cardboard sheet acquired by the warp state information acquisition means, so the experience and know-how of the operator The twist warp of the corrugated cardboard sheet is accurately and easily corrected without depending on the above. In particular, when the information acquisition means automatically acquires the information, the twist warp of the corrugated cardboard sheet is fully automatically corrected.

In the above system, preferably, among the control elements of the corrugated board sheet manufacturing apparatus, a corrugated board sheet is selected from among a plurality of specific control elements that affect the sheet width direction distribution of the tension in the sheet flow direction of the one-sided sheet or the front liner. It is preferable to provide control element selection means for selecting at least one specific control element in accordance with the state of the twist warp and the influence of each specific control element on the twist warp of the corrugated board.

In this case, preferably, the control element selecting means is configured to sequentially select additional specific control elements according to a predetermined priority in accordance with the degree of warpage of the corrugated board sheet. As a result, the degree of correction can be increased according to the amount of warp, and the warp of the corrugated board sheet can be corrected more quickly. In particular, when the priority is set higher for the specific control element having a greater influence on the warp of the corrugated board sheet, the warp of the corrugated board sheet can be corrected more quickly.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (A) First Embodiment FIG. 1 is a diagram showing an outline of a corrugated board warp correction system according to a first embodiment of the present invention. The cardboard sheet warp correction system according to the present embodiment includes a cardboard sheet manufacturing apparatus 1 and a production management apparatus 2 that controls the cardboard sheet manufacturing apparatus 1.

The corrugated board sheet manufacturing apparatus 1 mainly comprises a back liner preheater 10 for heating the back liner 20, a core preheater 12 for heating the core 21, and a core 21 heated by the core preheater 12. Back liner 20 which is lined up and glued and heated by back liner preheater 10.
To the single facer 11 for bonding, the single-sided sheet preheater 13 for heating the single-sided sheet 22 formed by the single facer 11, the front-side liner preheater 14 for heating the front-side liner 23, and the single-sided sheet 22 heated by the single-sided sheet preheater 13 Glue machine 1
5, single-sided sheet 2 glued by glue machine 15
The front liner 2 heated by the front liner preheater 14 in FIG.
A double facer 16 for laminating 3 to form a corrugated board sheet 24, a slitter scorer 17 for scoring and grooving the corrugated board sheet 24 formed by the double facer 16, and a corrugated board sheet 24 scoring by the slitter scorer 17 for dividing plates. It is provided with a cut-off 18 for cutting a corrugated sheet into a corrugated sheet (plate corrugated sheet) 25 as a final product, and a stacker 19 for stacking the corrugated sheet 25 in the order of completion.

Among the above-mentioned devices 10 to 19, there is a double facer 16 that affects the distribution of tension in the sheet width direction (the tension distribution in the sheet width direction can be adjusted).
Hereinafter, the double facer 16 will be described. As shown in FIG. 2, the double facer 16 includes a heating section 16A on the upstream side and a cooling section 16B on the downstream side along the traveling lines of the one-stage seat 22 and the front liner 23. I know. Of these, a plurality of heating plates 162 are arranged in the heating section 16A, and the front liner 23 passes over these heating plates 162. The heating plate 162 is heated to a predetermined temperature by supplying steam to the inside.

A loop-shaped pressure belt 163 runs on the heating plate 162 in synchronism with the above-mentioned running line in synchronization with the one-stage seat 22 and the front liner 23.
A plurality of pressure rolls (pressure means) 16 are provided in the loop 63.
4 so as to face the heating plate 162 (face the heating plate 162 and the rotation axis is parallel to the surface of the heating plate 162).
It is arranged. Among the pressure rolls 164, half of the pressure rolls 164A on the upstream side are driven to rotate while keeping the pressure roll 164A in parallel with the heating plate 162, and the pressure roll 164A is inclined with respect to the sheet width direction. It has a turning mechanism to change the angle.

That is, as shown in the plan view 3, a support member 164c for rotatably supporting one rotation shaft end 164a of the pressure roll 164A is rotatably supported by a device frame (not shown) and the other rotation shaft. The support member 164d that rotatably supports the end 164b is a fluid pressure cylinder 164.
It is swingably connected to the piston rod of e. By changing the piston rod length of the fluid pressure cylinder 164e, the pressure roll 164A can be swung around the support member 164c to change the inclination angle with respect to the seat width direction. It is like this. The fluid pressure cylinder 16
4e is supported by a device frame (not shown).

The one-sided sheet 22 glued by the glue machine 15 is carried from the side of the pressure belt 163 between the pressure belt 163 and the heating plate 162. 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 the hot platen 16 is heated.
It is carried in between the pressure belt 163 and the heating plate 162 from the second side. Then, the one-sided sheet 22 and the front liner 23 are carried in between the pressure belt 163 and the heating plate 162, respectively, and then are transferred integrally to the cooling section 16B in a state of being vertically overlapped. . During this transfer, the single-sided sheet 22 and the front liner 23 keep the pressure roll 16
4 is heated from the side of the front liner 23 while being pressed by the pressure belt 163 by the pressure belt 4, and is bonded to each other to form the corrugated cardboard sheet 24. Cardboard sheet 24
The entire width or the end portion is cut by the rotary shear 166 provided at the outlet of the cooling section 16B and transferred to the slitter scorer 17 in the next step.

The production control device 2 shown in FIG. 1 corrects the twist warp of the corrugated board sheet 25 by appropriately controlling the distribution of the tension of the corrugated board sheet 25 in the sheet width direction. Focusing on the warp correction function of the corrugated cardboard sheet 25, the production control device 2 includes a knowledge database 3, a control amount calculation unit 4, a process controller 5, and a warp state input unit 6 as shown in FIG. .

Among the control elements for controlling the corrugated board sheet manufacturing apparatus 1, the knowledge database 3 relates to a specific control element (specific control element) that influences the twist warp of the corrugated board sheet 25, and its control amount (current value). A set value for the adjustment amount) or a setting formula for setting the control amount is stored in correspondence with each twist warp state (warp pattern and warp size) of the corrugated cardboard sheet 25. . The specific control element mentioned here is the inclination angle of the pressure roll 164A of the double facer 16 or the like.

If the tension of the corrugated board sheet 25 is larger on the operating side than on the driving side, the corrugated board sheet 25 will have
Twist warp A as shown in (a) [a vertical displacement (warp) of a corner PB on the downstream side and the operating side and a corner PD on the diagonal side of the corner PB on the upstream side and the driving side] Warp such that the vertical displacement of the above becomes large. Therefore, in such a case, in order to reduce the tension on the operating side of the corrugated board sheet 25, for example, as shown in FIG.
In (c), the pressure roll 164A is swung from the position indicated by the solid line to the position indicated by the two-dot chain line (that is, the pressure roll 164A is swung about the operating shaft end 164a side toward the downstream side). Therefore, the knowledge database 3 defines the set value or the set expression of the control amount of the inclination angle θ (specifically, the stroke amount of the piston rod of the fluid pressure cylinder 164d (see FIG. 3)).

On the contrary, when the tension of the corrugated board sheet 25 is larger on the driving side than on the operating side, the corrugated board sheet 25 will be damaged as shown in FIG.
Twist warp B as shown in (b) (a vertical direction displacement of a corner PA on the downstream side and the driving side and a corner PC on the diagonal side of the corner PA and on the upstream side and the operating side) Twist warp that causes a large displacement occurs. Therefore, in such a case, in order to increase the tension on the operating side of the corrugated board sheet 25, for example, the pressure roll 164A is swung from the position indicated by the solid line to the position indicated by the two-dot chain line in FIG. That is, the pressure roll 164
The knowledge database 3 defines a set value or a set expression of the control amount of the inclination angle θ in order to turn A toward the upstream side around the rotation shaft end 164a side.

FIG. 5 shows the structure of the knowledge database 3 according to this embodiment. Here, the types of warped states of the corrugated cardboard sheet 25 correspond to the types of push buttons described later, that is, twist warpage A (large warpage) and twist warpage A.
Six types of (warp), twist warp A (small warp), twist warp B (large warp), twist warp B (medium warp), twist warp B (small warp) are set, and each warp state is set.
The inclination angle θ of the pressure roll 164A is controlled as a specific control element.

More specifically, the triangle mark, the circle mark, and the double circle mark indicate the magnitude of the control amount (adjustment amount from the current value),
Double circles, circles, and triangles indicate the larger control amounts in order (△ <○ <◎). Therefore, in the present embodiment, for example, when the warp state of the corrugated cardboard sheet 25 is the twist warp A and the warp amount is small, the operation side of the pressure roll 164A is inclined so as to move forward (move to the downstream side in the sheet conveying direction). When the angle θ is adjusted and the warp state is the twist warp A and the warp amount is in the middle, the tilt angle θ is adjusted so that the operating side of the pressure roll 164A advances by a larger adjustment amount than when the warp amount is small. When the warp state is the twist warp A and the warp amount is large, the tilt angle θ is adjusted so that the operating side of the pressure roll 164A advances by a larger adjustment amount than when the warp amount is in progress. The specific set value or setting formula of the adjustment amount is determined by a test or a simulation.

In this embodiment, the warp state of the corrugated board 25 is manually input by the operator in the warp state input section (warp state information acquisition means) 6.
The warp state input unit 6 has six push buttons 61 [twist warp A (large warp)], 62 [twist warp A (medium warp)], 63 [twist warp] according to each warp state classified in the knowledge database 3. A (warp small)], 65 [twist warp B (large warp)], 66 [twist warp B (medium warp)], 67 [twist warp B (small warp)] and a reset button 64 are provided. By selecting and pressing the corresponding button, the selection signal is input to the control amount calculation unit 4. Note that the warp state of the corrugated board sheet 25 is judged by an operator by visually observing the corrugated board sheets 25 stacked on the stacker 19.

The control amount calculation unit 4 searches the knowledge database 3 based on the selection signal from the warp state input unit 6. Then, the set value or set expression of the control amount of each corresponding control element is read from the knowledge database 3, and each control amount according to the machine state (operating state) of the corrugated board sheet manufacturing apparatus 1 is calculated. In the present embodiment, the control amount calculation section 4 and the knowledge database 3 constitute a control amount calculation means according to the present invention.

The machine state is, for example, each current value such as the operating speed of the corrugated board sheet manufacturing apparatus 1 (sheet traveling speed) and the inclination angle θ of the pressure roll 164A. The machine state information is input from the process controller 5 described later.

When the reset button 64 is selected in the warp state input unit 6, the control amount calculation unit 4 sets all control elements to original values (base paper configuration, basis paper weight, paper width, flute, etc.). A command is sent to the process controller 5 so as to return the value to the value determined by the matrix control based on the production state information. The process controller 5 is a device 1 that constitutes the corrugated board sheet manufacturing apparatus 1.
0 to 19 are comprehensively controlled. Normally, the process controller 5 controls each of the devices 10 to 19 by matrix control based on the production state information, but when the push buttons 61 to 63, 65 to 67 are pushed in the warp state input section 6, The control element of the corresponding device (here, the inclination angle θ of the pressure roll 164A) is controlled by the control amount calculated by the control amount calculation unit 4. When the reset button 64 is pressed, each device 10, 13, 14 is controlled so as to return all control elements to the original values. Further, the process controller 5 constantly grasps the machine state of the corrugated board sheet 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.

The flow chart shown in FIG. 6 shows the functions of the production control device 2 described above in a flow of a series of processes for correcting the warp of the corrugated board 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, it is determined whether or not the warp state can be currently input (the push buttons 61 to 67 can be pressed). This does not make sense to correct the warp in the situation where the adhesive force is too strong and the sheet speed does not increase, etc.Therefore, if there is any other trouble, correct the warp. This is a process to prevent it.

When the warp state can be input in step S30, it is determined in step S40 whether the warp state is actually input. Then, when the warp state is input, in step S50, the control amount of the control element (here, the inclination angle θ of the pressure roll 164A) to be controlled according to the input warp state is set to the knowledge database 3 Is calculated according to the machine state information acquired in step S10. At this time, the production state information acquired in step S20 may be used as reference data such as changing the inclination angle θ depending on the difference in the base paper configuration (thick paper or thin paper). Then, in step S60, the calculated control amount is output to the corresponding device.

As described above, according to the warp correction system for a corrugated board sheet according to the present embodiment, the operator visually judges the warped state of the corrugated board sheet 25 manufactured by the corrugated board sheet manufacturing apparatus 1 and responds to the warped state. Pressing rolls 164A that affect the twist warp of the corrugated cardboard sheet 25 only by pressing the buttons 61 to 63 and 65 to 67.
Since the inclination angle θ is automatically adjusted by the production control device 2, the twist warp of the corrugated cardboard sheet 25 can be accurately and easily corrected without depending on the experience and know-how of the operator.

In the first embodiment, the pressure roll 16
The case where the warp of the corrugated cardboard sheet 25 is corrected by using the inclination angle θ of 4A as the control element has been described, but this is just an example, and the number of types of control elements to be controlled is increased as in the second embodiment below. Good. Further, although half of the pressure rolls 164 are configured so that the inclination angle θ can be changed,
The pressure roll 164 capable of changing the inclination angle θ is at least one.
I need only one.

(B) Second Embodiment The corrugated board manufacturing system according to the present embodiment is different from the first embodiment in that the pressing force is applied to the pressure roll 164B at the rear stage of the double facer 16 shown in FIG. 2 in the sheet width direction. It is equipped with a variable pressurizing mechanism that can be changed. That is, as shown in the front view of FIG.
Supporting members 164f and 164f, which respectively support both rotary shaft ends 164a and 164b of 64B, are swingably attached to the tip of a piston rod of a fluid pressure cylinder 164g attached to an apparatus frame (not shown).

With such a structure, if the fluid pressure supplied to the fluid pressure cylinder 164g on the drive side is increased, the pressure applied to the drive side of the single-sided sheet 22 and the front liner 23 conveyed by the double facer 16 and thus the sheet 22. , 23
It is possible to increase the seat tension on the drive side of the. Similarly, the fluid pressure cylinder 164f on the operating side
If the fluid pressure supplied to the sheets 22 and 23 is increased,
It is possible to increase the pressure applied to the operating side, and consequently the sheet tension on the operating side of the seats 22 and 23. The control of the fluid pressure supplied to the fluid pressure cylinder 164f is performed by controlling the pressure control valve provided in the pipe for supplying the fluid to the fluid pressure cylinder 164f.

FIG. 8 shows the structure of the knowledge database 3 according to the second embodiment of the present invention. Focusing on the warp correction control, in the present embodiment, in addition to the control elements in the first embodiment, the widthwise distribution of the pressing force of the pressure roll 164B is set as the specific control element. Then, here, the control elements to be output are determined according to the priority order corresponding to the types of the push buttons described above (that is, according to the warp state of the corrugated cardboard sheet 25).
The priority order here is a priority order on the output. For example, when the degree of warpage is small, only the control element with a high priority order is output, and as the degree of warpage increases, other priority levels are sequentially output. The control element is specified to be additionally output. The priority is set higher for a control element that has a greater influence on the warp, in other words, a control element that has a higher force for correcting the warp.

Specifically, the adjustment of the inclination angle θ of the pressure roll 164A has the priority 1, and the adjustment of the widthwise distribution of the pressing force of the pressure roll 164B has the priority 2. And
When the twist warp A occurs in the corrugated cardboard sheet 25, in order to reduce the tension on the operating side of the corrugated cardboard sheet 25 or increase the tension on the driving side, if the warp is small, the pressure roll 164A is inclined. The angle θ is adjusted so that the operating side of the pressure roll 164A moves forward, and if the amount of warpage is medium, the adjustment amount of the inclination angle θ is increased and the pressing force of the pressure roll 164B on the drive side is increased. Is increased and the magnitude of the warp is large, both the tilt angle θ and the adjustment amount (control amount) of the pressing force are increased.

On the other hand, when the twist warp B occurs in the corrugated board sheet 25, if the warp is small in order to increase the tension on the operating side of the corrugated board sheet 25 or to decrease the tension on the driving side, it is added. The tilt angle θ of the pressure roll 164A is adjusted so that the operating side of the pressure roll 164A retracts.
If the amount of adjustment is increased, the pressing force on the operating side of the pressure roll 164B is increased, and the amount of warpage is large,
The tilt angle θ and the adjustment amount of the pressing force are both increased. The control amount of such a selected specific control element is calculated by the control amount calculation unit 4, and in the present embodiment, the control amount calculation unit 4 is used.
The knowledge database 3 and the knowledge database 3 constitute a control element selecting means and a control amount calculating means according to the present invention.

Therefore, according to the warp correction system for corrugated board sheet according to the present embodiment, the control element is selected according to the warp amount (here, the predetermined priority order is selected according to the warp size of the corrugated board sheet 25). Accordingly, the control elements are sequentially added), so that the warp can be corrected accurately and easily regardless of the warp amount. In particular, by setting the priority to be higher for a control element having a greater influence on the warp of the corrugated board sheet 25 as in the present embodiment, the warp of the corrugated board sheet 25 can be corrected more quickly.

Instead of the pressure roll 164A and / or the pressure roll 164B, a pressurizing unit (which comprises a shoe member and an actuator (for example, a fluid pressure cylinder) for pressing the shoe member against the heating plate 162 ( Plural sets of pressing means may be provided along the sheet width direction. By individually controlling the actuators of the pressurizing units arranged in the sheet width direction, the pressure applied to the heating plate 162 of the one-sided sheet 22 and the front liner 23 can be adjusted according to the sheet width direction, and the tension distribution in the width direction can be adjusted.

(C) Third Embodiment Next, a third embodiment of the present invention will be described. The corrugated board manufacturing apparatus 1 of the present embodiment has a configuration in which a winding roll (single-stage winding roll) 41 for the single-stage sheet 22 is added to the second embodiment. Here, the single-stage winding roll 41 is It is arranged between the single-stage sheet preheater 13 and the glue machine 15.

The one-stage winding roll 41 will be described with reference to FIG. The one-step winding roll 41 is provided with guide rolls 41a and 41b close to the upstream side and the downstream side, and the one-step sheet 22 is passed between the one-step winding roll 41 and the guide rolls 41a and 41b. It is wound around a roll 41. And
Similar to the pressure roll 164B of the double facer 16, both ends of the rotation shaft of the one-stage winding roll 41 are connected to piston rods of a fluid pressure cylinder (not shown),
The height positions of both ends of the rotary shaft can be individually changed. Therefore, for example, if the driving side end of the rotary shaft is moved upward in FIG. 9, the seat tension on the drive side can be increased, and conversely, the operating side of the rotary shaft is moved upward in FIG. By doing so, the seat tension on the operating side can be increased.

The one guide roll 41a is supported by the tip of an arm 41c that is swingably attached to the shaft of the one-stage winding roll 41, and this arm 41c is
It is driven by a motor (not shown), and a winding amount adjusting device is configured by the guide roll 41a and the motor (not shown). That is, arm 4
By driving the motor 1c to rotate the guide roll 41a to a predetermined position, the winding amount of the one-step sheet 22 around the one-step winding roll 41 can be adjusted. If the winding amount is increased, the resistance against running of the one-sided sheet 22 is increased, and the tension in the flow direction of the one-sided sheet 22 can be increased over the entire width, and conversely, if the winding amount is decreased. The tension in the flow direction of the single-sided sheet 22 can be reduced over the entire width. Also on the front liner 23 side, a winding roll having the same configuration as the winding roll 41 may be provided on the upstream side of the double facer 16. The installation location of the single-stage winding roll 41 may be on the upstream side of the glue machine 15.

Now, FIG. 10 shows the structure of the knowledge database 3 according to the third embodiment of the present invention. Focusing on the warp correction control, in the present embodiment, in addition to the control elements in the second embodiment, the height positions of both ends of the rotating shaft of the winding roll 41 are newly set as specific control elements. And the corrugated cardboard sheet 25
When twist warp A occurs on the pressure roll 164
Adjustment of tilt angle θ of A is priority 1, pressure roll 164B
The adjustment of the heights of both ends of the rotating shaft of No. 2 has priority 2, and the adjustment of the heights of both ends of the rotating shaft of the winding roll 41 has priority 3. The other configurations are the same as those in the first embodiment, and the description thereof will be omitted.

Therefore, according to the warp correction system for a corrugated board sheet according to the present embodiment, the number of control elements is further increased as compared with the second embodiment.
Finer control is possible than in the second embodiment, and the warp of the corrugated board sheet 25 can be corrected more accurately.

(D) Fourth Embodiment Next, a fourth embodiment of the present invention is shown in FIG.
This will be described with reference to (b). FIG. 11 is a diagram showing a single-stage suction brake according to a third embodiment of the present invention, (a) is a schematic side view thereof, and (b) is a schematic plan view thereof. The corrugated board manufacturing apparatus 1 of this embodiment has a configuration in which a single-stage suction brake 32 shown in FIGS. 11A and 11B is added to the third embodiment. The suction brake is to apply a suction force as a braking force to the running single-stage seat 22 and has been conventionally provided in the corrugated board manufacturing apparatus. However, the conventional single-stage suction brake is used for the single-stage seat. One is not provided, and the braking force (suction force) cannot be adjusted according to the seat width direction.

On the other hand, the one-stage suction brake 32 of the present embodiment, as shown in FIGS. 11 (a) and 11 (b), has a plurality of suction boxes 32 (two here).
Each suction box 32A is formed by arranging A in the sheet width direction, and each suction box 32A is connected to a suction source (not shown).
It is installed so that a is directed to the traveling line of the single-stage seat 22. For example, the process controller 5 can adjust the tension distribution in the width direction of the one-stage seat 22 by individually controlling the opening degree of the valve interposed in the suction line between each suction box 32A and the suction source. Has become. Specifically, if the suction force on the drive side of the single-stage suction brake 32 is increased, the tension in the flow direction on the drive side of the single-stage seat 22 can be increased, and the suction force on the operating side of the single-stage suction brake 32 is increased. Then, the tension in the flow direction of the one-sided sheet 22 on the operating side can be increased.

Now, FIG. 12 shows the structure of the knowledge database 3 according to the fourth embodiment of the present invention. Focusing on the warp correction control, in the present embodiment, in addition to the control elements in the third embodiment, the braking force distribution of the suction brake 32 is newly set as a specific control element. Then, for example, when the twist warp A occurs on the corrugated cardboard sheet 25, the adjustment of the inclination angle θ of the pressure roll 164A is priority 1, the adjustment of the widthwise distribution of the pressing force of the pressure roll 164B is priority 2, and the winding roll. Four
The adjustment of the heights of both ends of the No. 1 rotary shaft has the priority 3, and the adjustment of the braking force of the suction brake 32 has the priority 4. The other configurations are the same as those in the first embodiment, and the description thereof will be omitted.

Therefore, according to the warp correction system for a corrugated board sheet according to the present embodiment, the number of control elements is further increased as compared with the third embodiment, so that
Finer control is possible than in the third embodiment, and the warp of the corrugated board sheet 25 can be corrected more accurately.

(E) Fifth Embodiment Next, a fifth embodiment of the present invention will be described. The present embodiment is characterized by means for acquiring information regarding the warped state of the corrugated cardboard sheet 25, and other configurations are similar to those of the first embodiment.

As shown in FIG. 13, the production control device 2 according to the present embodiment is provided with a warp state determination section 8 instead of the warp state input section (push button) 6 according to the first embodiment. At the end of the corrugated board sheet manufacturing apparatus 1, 2
Two CCD cameras (imaging means) 7 are provided. C
The CD cameras 7 are arranged on both sides in the width direction of the stack portion 192 of the stacker 19 as shown in FIG. The corrugated cardboard sheets 25 cut by the cutoff 18 are conveyed to the stack unit 192 by a plurality of conveyors (not shown), and are sequentially stacked. Each CCD camera 7 images the corrugated cardboard sheets 25 stacked on the stack portion 192 from different side surfaces along the width direction, and outputs the image information to the warp state determination portion 8.

The warp state determination section 8 performs image processing on the image information from the CCD camera 7 and measures the heights of the four corners of the corrugated board sheet 25. Then, the pattern of twist warp of the corrugated cardboard sheet 25 (twist warp A or twist warp B) and the degree of warp (large, medium, or small) are determined from the measured height difference. The determination result is sent to the control amount calculation unit 4, and the control amount calculation unit 4 refers to the knowledge database 3 based on this determination result and responds to the machine state information by
The control amount of the specific control element is calculated.

Here, the determination of the warp state by the warp state determination unit 8 will be specifically described with reference to FIGS. 15 (a) and 15 (b). As shown in FIG. 15A, each CCD camera 7 is adapted to photograph the side surface of the corrugated board sheet 25 in the width direction. Then, the warp state determination unit 8 performs image processing on the image information from the CCD camera 7 to perform the cardboard sheet 2
Vertical displacement amounts a to d with respect to the reference line L0 shown in FIG. 15B are calculated for the four corners PA to PD of No. 5, respectively.

The warp state determination section 8 is adapted to calculate the twist warp amount TWF defined by the following equation (1) using these vertical displacement amounts a to d. Further, the warp pattern is determined based on whether the warp amount TWF is positive or negative, and the warp height is determined based on the absolute value of the warp amount TWF.

[Equation 1] In the above formula (1), W is the width dimension of the corrugated board sheet 25, L is the dimension in the sheet flow direction of the corrugated board sheet 25, and E is a constant for making the warpage amount dimensionless.

Therefore, according to the warp correction system for a corrugated board sheet according to the present embodiment, the corrugated board sheet 2 is
Since the warp of No. 5 is corrected automatically, the warp of the corrugated board sheet 25 can be corrected more accurately and more easily without relying on the experience and know-how of the operator. Further, here, the degree of warp is determined in three stages of large, medium, and small so as to use the knowledge database 3 of the first embodiment, but according to this system, the degree of warp is determined more finely. It is possible to correct the warp of the corrugated cardboard sheet 25 more accurately.

(F) Sixth Embodiment FIG. 16 is a schematic view showing the main configuration of a corrugated board warp detection device according to the present embodiment. Third mentioned above
In the embodiment, the warp state determination unit 8 detects the warp state of the corrugated cardboard sheet based on the image information obtained by the CCD camera 7, but in the present embodiment, instead of the two CCD cameras (imaging means) 7. Displacement sensors (displacement amount measuring means) 7A, 7B are used for the displacement sensors 7A, 7B.
The warp state determination unit 8 detects the warp state of the corrugated board sheet based on the measurement information of B.

The displacement sensor 7A, as shown in FIG.
A displacement sensor attachment member 72a is slidably attached to a rail 71a extending horizontally along the width direction of the corrugated board sheet 25, and the displacement sensor attachment member 72a is provided with a drive unit (not shown). Displacement sensor 7A
Can be horizontally moved along the width direction of the corrugated cardboard sheet 25 by the driving means in the above configuration, and the measurement points PC 'and PD' near the two upstream corners of the corrugated cardboard sheet 25 shown in FIG. The position of each point P is controlled vertically above the
The vertical displacement amounts c'and d'to C'and PD 'can be detected respectively.

On the other hand, as shown in FIG. 16, the displacement sensor 7B is slidable on a rail 73a attached to the frame 71 and extending horizontally along the width direction of the corrugated cardboard sheet 25 via a displacement sensor attachment member 74a. The displacement sensor mounting member 74a is provided with a driving means (not shown). The displacement sensor 7B is driven by this driving means and can move horizontally along the width direction of the corrugated board sheet 25, and the measurement points PA 'and PB' near two corners on the downstream side of the corrugated board sheet 25 shown in FIG.
The positions of the vertical displacements a'and b'from the displacement sensor to the points PA 'and PB' can be detected respectively.

Then, in the warp state judging section 8, the twist warp amount TWF is calculated by using the equation in which the vertical displacement amounts a to d in the above equation (1) are replaced with the vertical displacement amounts a'to d '. It has become. The other configurations are the same as those in the first embodiment, and the description thereof will be omitted. Therefore, according to the cardboard sheet warp correction system of the present embodiment, the same effect as that of the fourth embodiment can be obtained.

In order to detect the twist warp,
Measurement points PA ′ to PD ′ near the four corners of the corrugated board sheet 25
It suffices if the vertical displacement of the
A displacement sensor may be provided in a fixed position above each of A'to PD '. Further, in the above embodiment, the stacker 1
The displacement amount sensor detects the vertical displacement amount of the corrugated cardboard sheet 25 on the stack portion 192 of No. 9, but the displacement amount sensor detects the vertical displacement of the corrugated cardboard sheet as the final product cut by the cutoff 18 over the entire width. It is only necessary to be able to detect the amount of directional displacement. That is, cutoff 1
It suffices that the corrugated cardboard sheet 25 can be detected on the downstream side of 8, and, for example, a displacement amount sensor may be a conveyor 191 between the cutoff 18 and the stacker 19.
(See FIG. 16), the above detection may be performed on the corrugated cardboard sheet 25 conveyed on this conveyor.

(G) Others The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention. You can For example, the fifth embodiment has a configuration in which a warp state determination unit 8 and a CCD camera (imaging unit) 7 are provided instead of the warp state input unit (push button) 6 of the first embodiment. Although the warp state input unit (push button) 6 of the first embodiment is replaced by a warp state determination unit 8 and displacement sensors (displacement amount measuring means) 7A and 7B, the second to fourth embodiments are described. On the other hand, the warp state input section (push button) 6
In place of the warp state determination unit 8 and the CCD camera (imaging means) 7, a warp state determination unit 8 and displacement sensors (displacement amount measuring means) 7A and 7B are provided instead of the warp state input unit 6. It can also have a different configuration.

Further, the specific control element is not limited to the one used in each of the above-mentioned embodiments, and any specific control element may be used as long as it is a control element which influences the widthwise distribution of the tension of the one-sided sheet 22 or the front liner 23. Can be used to correct the warp of the cardboard sheet 25. Therefore, the configuration of the knowledge database 3 described in the first and second embodiments is only an example, and may be configured according to the specific control element to be used. Also, the priority order is not limited to the order of the above-described embodiment, and can be set arbitrarily.

[0065]

As described in detail above, according to the warp correction system for a corrugated board sheet of the present invention, the specific control that affects the twist warp of the corrugated board sheet according to the state of the twist warp of the manufactured corrugated board sheet. Since the elements are automatically controlled, there is an effect that the twist warp of the corrugated board sheet can be corrected accurately and easily without depending on the experience and know-how of the operator.

In particular, when the specific control elements are sequentially selected in accordance with the predetermined priority in accordance with the degree of warp of the corrugated cardboard sheet, the degree of correction should be increased according to the degree of warp. The warp of the corrugated cardboard sheet can be corrected more quickly, and when the priority is set higher for the specific control element that has a greater effect on the warp of the corrugated cardboard sheet, the warp of the corrugated cardboard sheet can be more promptly corrected. It becomes possible to correct it.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a cardboard sheet warp correction system according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of a double facer according to the first embodiment of the present invention.

FIG. 3 is a schematic plan view showing a configuration of a pressure roller of the double facer according to the first embodiment of the present invention.

FIG. 4 is a diagram for explaining the twist warp correction method according to the first embodiment of the present invention, in which (a) and (b) are schematic perspective views showing types of twist warp, (c),
(D) is a schematic plan view showing a pressure roller.

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 flowchart showing a flow of warp correction processing according to the first embodiment of the present invention.

FIG. 7 is a schematic front view (viewed from the sheet flow direction) showing the configuration of the pressure roller of the double facer 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 schematic side view showing a configuration of a single-stage winding roll according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a knowledge database according to a third embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a single-stage suction brake according to a third embodiment of the present invention, (a) is a schematic side view thereof, and (b) is a schematic plan view thereof.

FIG. 12 is a diagram showing a configuration of a knowledge database according to a fourth embodiment of the present invention.

FIG. 13 is a diagram showing an outline of a cardboard sheet warp correction system according to a fifth embodiment of the present invention.

FIG. 14 is a diagram showing an outline of a corrugated cardboard sheet warp state acquisition means according to a fifth embodiment of the present invention.

FIG. 15 is a view for explaining the method of acquiring the warp state of the corrugated board sheet according to the fifth embodiment of the present invention,
(A) is a schematic perspective view showing a state of capturing an image of a corrugated board sheet by a CCD camera (imaging means), and (b) is a schematic diagram showing a warped state of the corrugated board in a front view.

FIG. 16 is a diagram showing an outline of a warp state acquisition means of a corrugated board sheet according to a sixth embodiment of the present invention.

FIG. 17 is a schematic diagram for explaining a method of acquiring a corrugated state of a corrugated board sheet according to a sixth embodiment of the present invention.

[Explanation of reference numerals] 1 Corrugated board sheet manufacturing apparatus 2 Production management apparatus 3 Knowledge database 4 Control amount calculation unit 5 Process controller 6 Warp state input unit 7 CCD cameras (imaging means) 7A, 7B Displacement sensors (displacement amount measuring means) 8 Warp State determination unit 10 Back liner preheater 11 Single facer 12 Medium preheater 13 Single-sided sheet preheater 14 Front liner preheater 15 Glue machine 16 Double facer 17 Slitter scorer 18 Cutoff 19 Stacker 20 Backliner 21 Middle core 22 Single-sided sheet 23 Front liner 24 Corrugated board Sheet 25 Corrugated sheet (product) 30 Front liner mill brake 31 Front liner powder brake 32 Single-stage suction brake 32A Suction box 32a Suction port 41 Winding rolls 41a, 41b Guide roll 4 c Arms 61 to 67 Push buttons 71 Frame 71a Rails 72a Displacement sensor mounting member 162 Hot platen 163 Pressure belts 164, 164A, 164B Pressure rolls 164a, 164b Rotation shaft end portions 164c, 164d, 164e Support members 164f, 164g Fluid pressure cylinder 191 Conveyor 192 Stack part PA to PD Four corners PA 'to PD' of corrugated cardboard sheet 25 Measuring points near four corners of corrugated cardboard sheet 25

Claims (11)

[Claims] 1. A warp correction system for correcting a warp of a corrugated cardboard sheet manufactured by the corrugated cardboard sheet manufacturing apparatus, wherein the warp state acquires information on a twisted warp state of the corrugated cardboard sheet manufactured by the corrugated cardboard sheet manufacturing apparatus. An information acquisition unit, an operation state information acquisition unit that acquires information about an operation state of the corrugated board sheet manufacturing apparatus, and a corrugated cardboard sheet manufacturing apparatus based on warp state information of the corrugated cardboard sheet and operation state information of the corrugated cardboard sheet manufacturing apparatus. Of the control elements, the control amount calculation means for calculating the control amount of the specific control element that affects the distribution in the sheet width direction of the tension in the sheet flow direction of the one-stage sheet or the front liner, and the control calculated by the control amount calculation means And a control means for controlling the specific control element by an amount. System. 2. The twist warp of the corrugated cardboard sheet is selected from among a plurality of specific control elements that affect the sheet width direction distribution of the tension in the sheet flow direction of the one-sided sheet or the front liner among the control elements of the corrugated board sheet manufacturing apparatus. The control amount selecting means selects at least one specific control element in accordance with the state and the influence of each specific control element on the twist warp of the corrugated board, and the control amount calculation means controls the selected specific control element. 2. The warp correction system for corrugated board sheet according to claim 1, wherein a control amount is calculated, and the control means controls the selected specific control element with the control amount calculated by the control amount calculation means. . 3. The corrugated board sheet manufacturing apparatus includes a double facer for laminating the single-sided sheet and the front liner, wherein the double facer includes a heating plate and the single-sided sheet and the front liner arranged in the sheet flow direction, respectively. A plurality of pressurizing means for pressurizing the hot platen, and at least one of the plurality of pressurizing means is configured so that an inclination angle with respect to the sheet width direction can be changed. The corrugated board straightening system according to claim 1 or 2, wherein a corner is included in the specific control element. 4. At least one of the plurality of pressurizing means is configured so as to control the distribution in the sheet width direction of the pressing force applied to the one-stage sheet and the front liner, and the pressing force in the sheet width direction. The corrugated board warpage correction system according to claim 3, wherein a distribution is included in the specific control element. 5. A winding roll around which the single-stage sheet is wound is provided in front of a double facer, and the winding roll is configured so that the height positions of both shaft ends can be individually controlled, and the height of both shaft ends of the winding roll is increased. 5. The corrugated board sheet straightening system according to claim 4, wherein each of the height positions is set as the specific control element. 6. A suction brake for applying a braking force to the traveling of the one-stage seat by the suction force is provided, and the suction brake is configured so as to control the distribution of the suction force in the seat width direction. The corrugated sheet warping correction system according to claim 5, wherein a sheet width direction distribution is included in the specific control element. 7. The control element selecting means sequentially and additionally selects specific control elements according to a predetermined priority in accordance with the degree of warpage of the corrugated board sheet. The warp correction system for a corrugated cardboard sheet according to any one of 1. 8. The corrugated board sheet according to claim 1, wherein the priority is set higher for a specific control element having a greater influence on the twist warp of the corrugated board sheet. Warp correction system. 9. The warp state information acquisition means includes a selection means for allowing an operator to select any one of a plurality of options indicating a twist warp state of a corrugated cardboard sheet,
The cardboard sheet warp correction system according to any one of claims 1 to 8, wherein the option selected by the selection unit is acquired as information regarding the twist warp state of the cardboard sheet. 10. The warp state information acquisition means includes imaging means for imaging four corners of a corrugated board sheet manufactured by the corrugated board sheet manufacturing apparatus, and twist warp of the corrugated board sheet based on the image information obtained by the imaging means. A warp of the corrugated cardboard sheet according to any one of claims 1 to 8, further comprising: detection means for detecting, wherein the information detected by the detection means is acquired as information regarding a warped state of the corrugated cardboard sheet. Correction system. 11. The warp state information acquisition means is obtained by the displacement amount measuring means for measuring the vertical displacement amounts near the four corners of the corrugated cardboard sheet manufactured by the corrugated cardboard sheet manufacturing apparatus, and the displacement amount measuring means. 2. A detection unit for detecting twist warp of a corrugated cardboard sheet based on displacement amount information, and the information detected by the detection unit is acquired as information regarding the warp state of the corrugated cardboard sheet.
A warp correction system for a corrugated board according to any one of items 1 to 8.