Corrugated board manufacturing device and method

Abstract

The apparatus and method for manufacturing a corrugated board are provided with: a second paper receiving device for connecting a preceding paperboard to a following paperboard in a second paperboard; the third paper receiving device is used for connecting a preceding paperboard in the third paperboards with a subsequent paperboard; a single-sided corrugated board receiving detection unit that detects a third paper receiving unit of a third paperboard on the basis of the thickness of a single-sided corrugated board formed by bonding the second paperboard and the third paperboard; and a control device for controlling the paper receiving timing of at least one of the second paper receiving device and the third paper receiving device so that the third paper receiving part is positioned on the downstream side of the second paper receiving part of the second paper board in the paper board conveying direction at the bonding position of the second paper board and the third paper board.

Description

Technical Field

[0001] The present invention relates to a manufacturing device and method for a corrugated paperboard which is formed by laminating a surface lining board, a corrugated core and a lining board. Background Art

[0002] The corrugated paperboard manufacturing device includes a single-facer and a double-facer. The single-facer processes the core into a corrugated shape and attaches a liner to form a single-faced corrugated paperboard. The double-facer attaches a liner to the single-faced corrugated paperboard to form a double-faced corrugated paperboard. The continuous double-faced corrugated paperboard manufactured by the double-facer is cut into a predetermined width by a slitting and creasing machine, and is cut into a predetermined length by a cutting device to manufacture the corrugated paperboard.

[0003] The front liner, the middle core, and the back liner are paperboards supplied from the rolls held in the respective base paper stands. The base paper stands hold a plurality of rolls, and when the remaining rolls in the supplied paperboard become less, the paperboard can be continuously fed out by splicing the paperboard of the rolls in the waiting machine with a paper splicer. However, the splicing part of the paperboard is a defective part that cannot become a product, so it is preferable to detect and remove the splicing part in the manufacture of corrugated paperboard. In addition, in the bridge of the single-faced corrugated paperboard with a predetermined length retained between the outlet of the single-facer and the inlet of the double-facer, the bridge retention amount of the single-faced corrugated paperboard can be calculated based on the moving distance of the splicing part of the paperboard.

[0004] In the past, a metal sheet such as aluminum was attached to the paper splice of the paperboard, and the paper splice was detected by a metal sensor through the metal sheet. However, for example, when the paperboard meanders during transportation, the metal sensor cannot detect the metal sheet, and there is a possibility that the paper splice and the metal sheet are shipped together as a product. As a technology to solve such a problem, there are technologies described in the following patent documents 1 and 2, for example. The manufacturing device of corrugated paperboard described in patent documents 1 and 2 detects the position of the paper splice of the paperboard according to the thickness of the corrugated paperboard, and then cuts and removes the paper splice.

[0005] Prior art literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-113895

[0007] Patent Document 2: Japanese Patent Application Publication No. 2010-105772 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, when the corrugated cardboard is changed to a different type of corrugated cardboard during the production of corrugated cardboard, a batch change is performed. For example, each splicer provided corresponding to the front liner, the core and the back liner splices the front liner, the core and the back liner that are currently fed with the front liner, the core and the back liner of a different type. Therefore, when the single-facer machine bonds the corrugated core and the back liner to form a single-faced corrugated cardboard, since the splicing part of the core overlaps two sheets, it is difficult to form an appropriate corrugation by the single-facer machine, and sometimes poor bonding with the back liner occurs.

[0010] The corrugator is provided with a bridge for retaining a predetermined length of single-faced corrugated cardboard between the exit of the single-faced machine and the entrance of the double-faced machine. The bridge retention amount of the single-faced corrugated cardboard in the bridge is calculated based on, for example, the movement distance of the single-faced corrugated cardboard from the detection of the paper splicing portion of the liner board on the upstream side of the bridge to the detection of the paper splicing portion of the liner board on the downstream side of the bridge. In this case, the paper splicing portion of the liner board is detected by the difference between the thickness of the single-faced corrugated cardboard at the portion of the liner board where the paper splicing portion does not exist and the thickness of the single-faced corrugated cardboard at the portion of the liner board where the paper splicing portion exists. However, in a state where the paper splicing portion of the core is advanced than the paper splicing portion of the liner board, if the core and the liner board are poorly bonded at the position of the paper splicing portion of the core, the paper splicing portion of the liner board is hindered by the poor bonding, and the thickness of the single-faced corrugated cardboard cannot be properly detected. Therefore, at the downstream side of the bridge, the paper splicing portion of the liner board in the single-faced corrugated cardboard cannot be detected, and there is a problem that the bridge accumulation amount cannot be calculated.

[0011] The present invention is used to solve the above-mentioned problems, and its object is to provide a manufacturing device and method of corrugated paperboard which can suppress the detection obstruction of the paper splicing portion of the second paperboard caused by the poor lamination between the core and the liner board.

[0012] Means for solving problems

[0013] The corrugated cardboard manufacturing device disclosed in the present invention for achieving the above-mentioned purpose conveys corrugated cardboard formed by laminating a first cardboard, a second cardboard after corrugation processing, and a third cardboard. The corrugated cardboard manufacturing device comprises: a second paper splicing device for connecting a subsequent cardboard to a preceding cardboard in the second cardboard; a third paper splicing device for connecting a subsequent cardboard to a preceding cardboard in the third cardboard; a single-faced corrugated cardboard splicing detection unit for detecting a third paper splicing unit of the third cardboard based on the thickness of the single-faced corrugated cardboard formed by laminating the second cardboard and the third cardboard; and a control unit for controlling the splicing timing of at least one of the second paper splicing device and the third paper splicing device so that at the laminating position of the second cardboard and the third cardboard, the third paper splicing unit is located at a position downstream of the second paper splicing unit of the second cardboard in the cardboard conveying direction.

[0014] In addition, the manufacturing method of the corrugated cardboard disclosed in the present invention manufactures a corrugated cardboard formed by laminating a first cardboard, a second cardboard after corrugation processing, and a third cardboard. The manufacturing method of the corrugated cardboard has the following steps: connecting the following cardboard to the preceding cardboard of the second cardboard; connecting the following cardboard to the preceding cardboard of the third cardboard; controlling the paper splicing timing of at least one of the second cardboard and the third cardboard so that at the laminating position of the second cardboard and the third cardboard, the third paper splicing portion of the third cardboard is located at a downstream side of the second paper splicing portion of the second cardboard in the cardboard conveying direction; and detecting the third paper splicing portion based on the thickness of the single-faced corrugated cardboard formed by laminating the second cardboard and the third cardboard.

[0015] Effects of the Invention

[0016] According to the manufacturing device and method of the corrugated cardboard of the present invention, it is possible to suppress the detection obstruction of the paper splicing portion of the second cardboard caused by the poor bonding between the core and the liner board. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram showing a corrugating machine according to the present embodiment.

[0018] Figure 2 It is a schematic structural diagram showing the manufacturing apparatus of the corrugated cardboard according to the present embodiment.

[0019] Figure 3 It is a schematic configuration diagram showing a process flow in the corrugated cardboard manufacturing apparatus according to the present embodiment.

[0020] Figure 4 This is a schematic diagram showing the method of splicing paper sheets.

[0021] Figure 5 This is a schematic diagram showing a paper splice detection section.

[0022] Figure 6 This is a schematic diagram showing a single-faced corrugated cardboard splice detection section.

[0023] Figure 7 This is a schematic diagram showing a corrugated peak deformation device.

[0024] Figure 8 This is a schematic diagram of the peripheral part of a single-facer machine for explaining the flow of a core sheet, a liner sheet, and a single-face corrugated cardboard.

[0025] Fig. 9 This is a schematic diagram of the periphery of a double-face machine for explaining the flow of a face liner and a single-face corrugated cardboard.

[0026] Fig.10 This is a schematic diagram showing a single-faced corrugated cardboard.

[0027] Fig.11 This is a schematic diagram showing the paper splicing section of a single-faced corrugated cardboard.

[0028] Fig.12 This is a schematic diagram showing a defect at the paper splicing portion of a single-faced corrugated cardboard.

[0029] Fig.13 This is a schematic diagram showing the corrugation deformation portion of a single-faced corrugated cardboard.

[0030] Fig.14 This is a flow chart showing a method for manufacturing corrugated cardboard. DETAILED DESCRIPTION

[0031] Hereinafter, the preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, the present disclosure is not limited to the embodiments, and in the case where there are multiple embodiments, a technical solution composed of a combination of the embodiments is also included. In addition, the constituent elements in the embodiments include elements that can be easily thought of by those skilled in the art, substantially the same elements, and so-called elements of an equivalent range.

[0032] [Present Embodiment]

[0033] <Schematic structure of corrugated machine>

[0034] The manufacturing apparatus of the corrugated cardboard of this embodiment is applied to a corrugator. Figure 1 It is a schematic diagram showing a corrugator. In the following description, the longitudinal direction of the corrugator is set as the X direction, the horizontal direction perpendicular to the longitudinal direction (X direction) of the corrugator is set as the Y direction (the width direction of the corrugated cardboard), and the vertical direction perpendicular to the longitudinal direction (X direction) of the corrugator (the thickness direction of the corrugated cardboard) is set as the Z direction for description. In addition, the first cardboard is equivalent to the surface lining board A, the second cardboard is equivalent to the core B1, B2, and the third cardboard is equivalent to the inner lining board C1, C2.

[0035] like Figure 1 As shown, the corrugator 10 firstly laminates the inner liner board C1 to the corrugated core B1 to manufacture the single-faced corrugated board D1, and laminates the inner liner board C2 to the corrugated core B2 to manufacture the single-faced corrugated board D2. Next, laminates the inner liner board C2 of the single-faced corrugated board D2 to the core B1 of the manufactured single-faced corrugated board D1, and laminates the outer liner board A to the core B2 of the single-faced corrugated board D2 to manufacture a continuous multi-faced corrugated board. Furthermore, the continuous multi-faced corrugated board is cut into a predetermined length, thereby manufacturing a plate-shaped multi-faced corrugated board.

[0036] In addition, the corrugator 10 can manufacture double-faced corrugated cardboard by laminating single-faced corrugated cardboard D2 or single-faced corrugated cardboard D1 with the liner board A. In addition, the corrugator 10 can manufacture multi-faced corrugated cardboard by laminating single-faced corrugated cardboard D1, single-faced corrugated cardboard D2 and liner board A. Therefore, in the following description, double-faced corrugated cardboard and multi-faced corrugated cardboard are collectively referred to as double-faced corrugated cardboard E. In addition, plate-shaped double-faced corrugated cardboard and plate-shaped multi-faced corrugated cardboard are collectively referred to as double-faced corrugated cardboard F.

[0037] The corrugator 10 includes: a base paper stand 11 for the core B1, a base paper stand 12 for the liner board C1, a single-sided machine 13, a bridge 14, a base paper stand 15 for the core B2, a base paper stand 16 for the liner board C2, a single-sided machine 17, a bridge 18, a base paper stand 19 for the surface liner board A, a preheater 20, a glue coater 21, a double-sided machine 22, a rotary shearing machine 23, a longitudinal cutting and creasing machine 24, a cutting machine 25, a defective product discharge device 26 and a paper stacker 27.

[0038] The base paper racks 11 and 15 are respectively provided with rolls of paper that are rolled into rolls of the cores B1 and B2 on both sides in the X direction, and splicers (second splicing devices) 31 and 32 are provided for splicing between the rolls. When paper is supplied from one roll, another roll is installed to prepare for splicing, and when the remaining paper of one roll becomes less, the splicers 31 and 32 connect the other roll to one roll. Therefore, the cores B1 and B2 are continuously supplied from each base paper rack 11 and 15 to the downstream side.

[0039] The base paper stands 12 and 16 are provided with rolls of paper wound in rolls by lining plates C1 and C2 on both sides in the X direction, and splicers (third splicing devices) 33 and 34 are provided for splicing between the rolls. When paper is fed from one roll, the other roll is installed to prepare for splicing, and when the remaining paper of one roll becomes less, the splicers 33 and 34 connect the other roll to one roll. Therefore, the lining plates C1 and C2 are continuously supplied from the base paper stands 12 and 16 to the downstream side.

[0040] The cores B1 and B2 fed from the base paper stands 11 and 15 and the liner boards C1 and C2 fed from the base paper stands 12 and 16 are preheated by preheaters (not shown). Each preheater has a heating roller supplied with steam, and the cores B1 and B2 and the liner boards C1 and C2 are wound around the heating rollers and fed to raise their temperatures to a predetermined temperature.

[0041] After the heated core B1 is processed into a corrugated shape, the single-facer 13 applies glue to the top of each corrugation and adheres the heated liner board C1 to form a single-faced corrugated cardboard D1. The single-facer 13 is provided with a pick-up conveyor 28 at the exit of the single-faced corrugated cardboard D1, and the single-faced corrugated cardboard D1 formed by the single-facer 13 is conveyed to the bridge 14. The bridge 14 temporarily retains the single-faced corrugated cardboard D1 in order to absorb the speed difference between the single-facer 13 and the double-facer 22.

[0042] After the heated core B2 is processed into a corrugated shape, the single-facer 17 applies glue to the top of each corrugation and adheres the heated liner board C2 to form a single-faced corrugated cardboard D2. The single-facer 17 is provided with a pick-up conveyor 29 at the exit of the single-faced corrugated cardboard D2, and the single-faced corrugated cardboard D2 formed by the single-facer 17 is conveyed to the bridge 18. The bridge 18 temporarily retains the single-faced corrugated cardboard D2 in order to absorb the speed difference between the single-facer 17 and the double-facer 22.

[0043] The paper guide device 30 is provided at the exit of the bridges 14 and 18. The paper guide device 30 adjusts the Y-direction positions of the single-faced corrugated cardboard D1 and the single-faced corrugated cardboard D2 between the bridges 14 and 18 and the double-facer 22.

[0044] The base paper stand 19 is provided with rolls of paper formed by rolling the top liner A into a roll shape on both sides in the X direction, and a paper splicer (first paper splicing device) 35 for splicing paper between the paper rolls is provided. When paper is fed from one roll, another roll is installed to prepare for splicing, and when the remaining paper of one roll becomes less, the paper splicer connects the other roll to one roll. Therefore, the top liner A is continuously supplied from the base paper stand 19 to the downstream side.

[0045] The three preheating rollers 41, 42, and 43 of the preheater 20 are arranged in a row in the Z direction. The preheating roller 41 heats the face liner board A, the preheating roller 42 heats the single-face corrugated cardboard D2, and the preheating roller 43 heats the single-face corrugated cardboard D1. Each of the preheating rollers 41, 42, and 43 has a winding amount adjustment device (not shown), and steam is supplied inside to heat to a predetermined temperature, and the face liner board A, the single-face corrugated cardboard D2, and the single-face corrugated cardboard D1 are wound around the circumference to perform preheating.

[0046] The glue rollers 44 and 45 of the glue coating machine 21 are arranged in the Z direction. The glue coating roller 44 contacts each top of the corrugation of the core B2 in the single-faced corrugated cardboard D2 heated by the preheating roller 42 to apply glue. The glue coating roller 45 contacts each top of the corrugation of the core B1 in the single-faced corrugated cardboard D1 heated by the preheating roller 43 to apply glue. The single-faced corrugated cardboards D1 and D2 glued by the glue coating machine 21 are transferred to the double-face machine 22 of the next process. The liner board A heated by the preheating roller 41 also passes through the glue coating machine 21 and moves to the double-face machine 22.

[0047] The double-face machine 22 has a heating section 36 on the upstream side and a cooling section 37 on the downstream side along the running line of each single-face corrugated cardboard D1, D2 and the front liner A. The single-face corrugated cardboard D1, D2 and the front liner A coated with glue by the glue coating machine 21 are moved between the pressure belt and the hot plate in the heating section 36, and are transferred to the cooling section 37 in a mutually overlapping state as a whole. During this transfer, each single-face corrugated cardboard D1, D2 and the front liner A are pressed and heated, thereby being bonded to each other to form a continuous double-face corrugated cardboard E, and then naturally cooled while being conveyed.

[0048] The double-faced corrugated cardboard E manufactured by the double-faced machine 22 is transferred to the slitting and creasing machine 24. The slitting and creasing machine 24 cuts the wide double-faced corrugated cardboard E along the X direction so as to have a predetermined width, and processes the grid lines extending along the X direction. The slitting and creasing machine 24 is composed of a first slitting and creasing machine unit 53 and a second slitting and creasing machine unit 54 of substantially the same structure arranged along the X direction of the double-faced corrugated cardboard E. The wide double-faced corrugated cardboard E is cut by the slitting and creasing machine 24, thereby forming a double-faced corrugated cardboard E of a predetermined width.

[0049] The cutter 25 cuts the double-faced corrugated cardboard E cut along the X direction by the slitting and creasing machine 24 along the Y direction, and forms a plate-shaped double-faced corrugated cardboard F having a predetermined length. The defective product discharge device 26 discharges the double-faced corrugated cardboard F determined as a defective product by the defective detection device described later from the conveyor line. Although not shown in the figure, the defective product discharge device 26 has a discharge conveyor and a sorting roller. When the plate-shaped double-faced corrugated cardboard F determined as a defective product is conveyed, the sorting roller descends and sorts the defective plate-shaped double-faced corrugated cardboard F to the discharge conveyor and discharges it. The stacker 27 accumulates the double-faced corrugated cardboard F determined as a good product and discharges it outside the machine as a product.

[0050] <Detailed structure of corrugated machine>

[0051] The structure of the manufacturing apparatus of the corrugated cardboard of this embodiment is demonstrated. Figure 2 1 is a schematic structural diagram showing a corrugated cardboard manufacturing device according to the present embodiment. Figure 3 It is a schematic configuration diagram showing a process flow in the corrugated cardboard manufacturing apparatus according to the present embodiment.

[0052] The corrugator 10 separately conveys the surface liner A, the corrugated core B1, B2 and the inner liner C1, C2, and bonds the corrugated core B1, B2 with the inner liner C1, C2 to form single-sided corrugated cardboards D1, D2, and bonds the surface liner A to the single-sided corrugated cardboards D1, D2 to form double-sided corrugated cardboards E.

[0053] like Figure 2As shown, the corrugator 10 includes: a paper splicing detection unit 61 , a single-face corrugated board paper splicing detection unit 62 , a corrugation peak deformation device 63 and a control device 64 .

[0054] The paper splicing detection unit 61 is arranged between the paper splicing position and the cardboard pasting position in the cardboard conveying direction (one side in the X direction). Here, the paper splicing position refers to the position connecting the preceding cardboard and the succeeding cardboard in the top lining board A, the core B1, B2 and the back lining board C1, C2. The cardboard pasting position refers to the position where the core B1, B2 and the back lining board C1, C2 after the corrugated processing are pasted, or the position where the top lining board A and the single-faced corrugated cardboard D1, D2 are pasted. The paper splicing detection unit 61 detects the paper splicing part based on the cardboard shape. Specifically, the paper splicing detection unit 61 detects the paper splicing part based on the cardboard thickness of each of the top lining board A, the core B1, B2 and the back lining board C1, C2.

[0055] The single-faced corrugated cardboard splice detection unit 62 is arranged between the cardboard retention position and the cardboard pasting position in the cardboard conveying direction. Here, the cardboard retention position refers to the position where the single-faced corrugated cardboards D1 and D2 are retained, and the cardboard pasting position refers to the position where the liner board A and the single-faced corrugated cardboards D1 and D2 are pasted. The single-faced corrugated cardboard splice detection unit 62 detects the splice based on the cardboard shape. Specifically, the single-faced corrugated cardboard splice detection unit 62 detects the splice based on the cardboard thickness of the single-faced corrugated cardboards D1 and D2.

[0056] The corrugation deformation device 63 is arranged between the cardboard bonding position and the cardboard retention position in the cardboard conveying direction. Here, the cardboard bonding position refers to the position where the corrugated core B1, B2 is bonded to the lining boards C1, C2, and the cardboard retention position refers to the position where the single-faced corrugated cardboards D1, D2 are retained. The corrugation deformation device 63 forms a corrugation deformation portion by deforming the corrugations formed by corrugating the cores B1, B2. Specifically, the corrugation deformation device 63 crushes the corrugations of the cores B1, B2 constituting the single-faced corrugated cardboards D1, D2 to deform them and form the corrugation deformation portion.

[0057] In addition, the single-faced corrugated cardboard splice detection section 62 detects the flute deformed portions in the single-faced corrugated cardboard D1 and D2 formed by the flute deforming device 63. Furthermore, the single-faced corrugated cardboard splice detection section 62 detects the flute deformed portions (defective portions) in the single-faced corrugated cardboard D1 and D2 other than those formed by the flute deforming device 63.

[0058] The control device 64 controls the timing of splicing of at least one of the splicers 31, 32 and the splicers 33, 34 so that at the bonding position of the core B1, B2 and the lining boards C1, C2 after the corrugation process, the splicing section (third splicing section) of the lining boards C1, C2 is located at the downstream side of the splicing section (second splicing section) of the core B1, B2 in the paperboard conveying direction. In addition, the control device 64 controls the working timing of the defective product discharge device 26 based on the position information of the splicing section and the corrugation peak deformation section detected by the paperboard splicing detection section 61 and the single-face corrugated paperboard splicing detection section 62. Here, the control device 64 is a controller, which is realized by, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), etc., using RAM as an operating area to execute various programs stored in the storage section.

[0059] The process flow in the corrugator 10 is described. Figure 2 and Figure 3 As shown, the paper splicing detection unit 61 detects the paper splicing portions of the top liner A, the core B1, B2, and the back liner C1, C2. The core B1, B2 are fed from the base paper stand 11, 15, and are transported to the single-facer 13, 17 through the splicers 31, 32. The back liner C1, C2 are fed from the base paper stand 12, 16, and are transported to the single-facer 13, 17 through the splicers 33, 34. The top liner A is fed from the roll stand 19, and is transported to the preheater 20 through the splicer 35.

[0060] The paper splicing detection unit 61 is composed of five ultrasonic sensors 61a, 61b, 61c, 61d, and 61e. The ultrasonic sensors 61a and 61c are arranged between the paper splicers 31 and 33 and the single-facer 13. The ultrasonic sensors 61b and 61d are arranged between the paper splicers 32 and 34 and the single-facer 17. The ultrasonic sensor 61e is arranged between the paper splicer 35 and the preheater 20. The ultrasonic sensors 61a, 61b, 61c, 61d, and 61e are connected to the control device 64 and output the detection results to the control device 64.

[0061] The single-faced corrugated cardboard splice detection unit 62 detects the splice and corrugation deformation portion based on the cardboard thickness of the single-faced corrugated cardboards D1 and D2. The single-faced corrugated cardboard D1 is conveyed from the single-facer 13 to the double-facer 22 via the bridge 14, the preheater 20 and the glue coater 21. The single-faced corrugated cardboard D2 is conveyed from the single-facer 17 to the double-facer 22 via the bridge 18, the preheater 20 and the glue coater 21.

[0062] The single-faced corrugated cardboard splice detection unit 62 is composed of two laser displacement meters 62a and 62b. The laser displacement meters 62a and 62b are arranged between the preheater 20 and the glue applicator 21. The laser displacement meters 62a and 62b are arranged to be separated by a predetermined distance from the surface of the core B1 and B2 of the single-faced corrugated cardboard D1 and D2 to which the liner board A is attached. The laser displacement meters 62a and 62b are connected to the control device 64 and output the detection results to the control device 64.

[0063] The flute deformation device 63 is connected to the control device 64, and the control device 64 controls the operation of the flute deformation device 63. The control device 64 deforms the flute of the core B1 and B2 in the single-faced corrugated paperboard D1 and D2 by operating the flute deformation device 63, thereby forming a flute deformation portion. The flute deformation device 63 is composed of two crushing devices 63a and 63b. The crushing devices 63a and 63b are arranged between the single-facer 13 and 17 and the bridge 14 and 18.

[0064] The crushing device 63a is movably arranged at a position separated by a predetermined distance from the lining board C1 constituting the single-faced corrugated cardboard D1. The crushing device 63a moves in a manner close to the single-faced corrugated cardboard D1, crushes the core B1 of the corrugated cardboard D1, and forms a corrugated peak deformation portion. The crushing device 63b is movably arranged at a position separated by a predetermined distance from the lining board C2 constituting the single-faced corrugated cardboard D2. The crushing device 63b moves in a manner close to the single-faced corrugated cardboard D2, crushes the core B2 of the corrugated cardboard D2, and forms a corrugated peak deformation portion.

[0065] The control device 64 controls the timing of splicing in the splicers 31, 32, 33, 34, and 35 when changing the type (width, thickness, paper quality, etc.) of the manufactured corrugated cardboard. At this time, the control device 64 adjusts the timing of splicing in the splicers 31, 32 and the splicers 33, 34 so that at the bonding position of the core B1, B2 and the liner boards C1, C2 in the single-facer 13, 17, the splicing portion of the liner boards C1, C2 is located at the downstream side of the splicing portion of the core B1, B2 in the cardboard conveying direction.

[0066] In addition, when switching batches or splicing due to insufficient paper roll, the control device 64 calculates the bridging retention amount of the single-faced corrugated cardboards D1 and D2 in the bridges 14 and 18 based on the position of the paper splicing part of the lining boards C1 and C2 detected by the cardboard splicing detection unit 61 and the position of the paper splicing part of the lining boards C1 and C2 in the single-faced corrugated cardboards D1 and D2 detected by the single-faced corrugated cardboard splicing detection unit 62.

[0067] In addition, the control device 64 operates the flute deformation device 63 to form flute deformation portions on the single-faced corrugated paperboards D1 and D2 when the corrugator 10 starts to operate. Furthermore, the control device 64 calculates the bridging retention amount of the single-faced corrugated paperboards D1 and D2 in the bridging 14 and 18 based on the position of the flute deformation portion in the single-faced corrugated paperboards D1 and D2 formed by the flute deformation device 63 and the position of the flute deformation portion in the single-faced corrugated paperboards D1 and D2 detected by the single-faced corrugated paperboard splicing detection unit 62.

[0068] In addition, the control device 64 tracks the paper splicing parts of the front liner A, the core B1, B2, and the backing boards C1, C2 detected by the paper splicing detection unit 61 and the corrugated cardboard splicing detection unit 62. The control device 64 controls the operation timing of the defective product discharge device 26 based on the position information of the paper splicing parts and the corrugated cardboard splicing detection unit 62.

[0069] <Paper splice detection unit>

[0070] Figure 4 This is a schematic diagram showing the paper splicing method of the cardboard. Figure 5 This is a schematic diagram showing a paper splice detection section.

[0071] like Figure 3 and Figure 4 As shown, the base paper stand 11 feeds out the core B1 by rotating one roll of paper. At this time, when one roll of paper is reduced and insufficient or a batch replacement is required, the core B1 is spliced. That is, when one roll of paper rotates to feed out the leading paperboard B1a of the core B1, the paper splicer 31 feeds out the following paperboard B1b of the core B1 by rotating another roll of paper at the same speed, and connects the following paperboard B1b with the leading paperboard B1a. Therefore, the base paper stand 11 can continuously feed out the core B1.

[0072] The paper splicing of the core B1 is specifically described. The preceding cardboard B1a of the core B1 moves along the cardboard conveying direction X1, and the following cardboard B1b moves along the cardboard conveying direction X2 at the same speed. At this time, a double-sided tape Tb as an adhesive is attached to the surface of the cut front end of the following cardboard B1b on the side facing the preceding cardboard B1a. At a predetermined timing, the leading cardboard B1a and the following cardboard B1b are crimped with the double-sided tape Tb sandwiched therebetween. Thus, the double-sided tape Tb of the following cardboard B1b is crimped to the pasting portion B1T of the preceding cardboard B1a, and the following cardboard B1b is connected to the preceding cardboard B1a. At the same time as this operation, the preceding cardboard B1a is cut on the upstream side of the paper splicing portion with the following cardboard B1b.

[0073] like Figure 5As shown in FIG. 1 , the rear end of the preceding paperboard B1a and the front end of the following paperboard B1b of the core B1 are connected by double-sided tape Tb to form a paper splicing portion B1c. The paper splicing portion B1c is formed by overlapping the lower surface of the rear end of the preceding paperboard B1a and the upper surface of the front end of the following paperboard B1b by the double-sided tape Tb. Therefore, the thickness of the paper splicing portion B1c is the sum of the thickness of the preceding paperboard B1a, the thickness of the following paperboard B1b, and the thickness of the double-sided tape Tb. That is, the thickness of the paper splicing portion B1c is thicker than the thickness of the preceding paperboard B1a and the thickness of the following paperboard B1b.

[0074] The paper splice detection unit 61 includes an ultrasonic sensor 61a. The ultrasonic sensor 61a includes a transmitter 61a-1 and a receiver 61a-2. The transmitter 61a-1 is disposed on the upper surface side of the core B1 being transported, and the receiver 61a-2 is disposed on the lower surface side of the core B1 being transported. The transmitter 61a-1 and the receiver 61a-2 are disposed in a manner facing each other up and down.

[0075] The transmitting unit 61a-1 transmits ultrasonic waves toward the core B1, and the receiving unit 61a-2 receives the ultrasonic waves that have passed through the core B1. At this time, the ultrasonic waves transmitted from the transmitting unit 61a-1 are attenuated when passing through the core B1, and the receiving unit 61a-2 receives the attenuated ultrasonic waves. The thickness of the paper splicing portion B1c of the core B1 is thicker than the thickness of the preceding paper board B1a and the following paper board B1b. Therefore, the attenuation amount of the ultrasonic waves of the paper splicing portion B1c of the core B1 is greater than the attenuation amount of the ultrasonic waves of the preceding paper board B1a and the following paper board B1b. The ultrasonic sensor 61a outputs the level of the ultrasonic waves received by the receiving unit 61a-2 to the control device 64. The control device 64 detects the paper splicing portion B1c based on the level of the ultrasonic waves input from the ultrasonic sensor 61a.

[0076] That is, the level of the ultrasonic wave that has passed through the preceding paper sheet B1a and the succeeding paper sheet B1b is measured in advance, and the level of the ultrasonic wave that has passed through the paper splicing portion B1c is measured. A judgment value is set as a threshold value between the level of the ultrasonic wave that has passed through the preceding paper sheet B1a and the succeeding paper sheet B1b and the level of the ultrasonic wave that has passed through the paper splicing portion B1c. Then, the control device 64 detects the paper splicing portion B1c by comparing the level of the ultrasonic wave input from the ultrasonic sensor 61a with the judgment value. That is, the control device 64 judges that it is the paper splicing portion B1c when the level of the ultrasonic wave input from the ultrasonic sensor 61a exceeds the judgment value.

[0077] In addition, the ultrasonic sensor 61a for detecting the paper splicing portion B1c of the core B1 has been described above, but the paper splicing portions and ultrasonic sensors 61b, 61c, 61d, and 61e of the front liner A, core B2, and backing liner C1 and C2 are also the same.

[0078] In addition, the paper splice detection unit 61 is not limited to being configured as an ultrasonic sensor 61a. For example, the paper splice detection unit 61 may also be configured by a laser displacement meter. That is, the laser displacement meter is arranged on the upper surface side or the lower surface side of the conveyed core B1. There is a step difference between the paper splice B1c and the preceding paperboard B1a or the following paperboard B1b. Therefore, the distance from the laser displacement meter to the preceding paperboard B1a of the core B1 is different from the distance to the following paperboard B1b. The control device 64 detects the paperboard step difference by comparing the time from the laser displacement meter to the preceding paperboard B1a and the time from the laser displacement meter to the following paperboard B1b ...c and the time from the laser displacement meter to the following paperboard B1c and the time from the laser displacement meter to the following paperboard B1a and the time from the laser displacement meter to the following paperboard B1b and the time from the laser displacement meter to the following paperboard B1b and the time from the laser displacement meter to the following paperboard B1b and the time from the laser displacement meter to the following paperboard B1c and the time from the laser displacement meter to the laser displacement meter to the following

[0079] <Single-sided corrugated cardboard splicing inspection unit>

[0080] Figure 6 This is a schematic diagram showing a single-faced corrugated cardboard splice detection section.

[0081] like Figure 6 As shown, the single-faced corrugated cardboard D1 is formed by pasting a sheet-like liner board C1 on the corrugated core B1. The single-faced corrugated cardboard D1 is wound around the guide roller 184c described later at a predetermined angle and is transported. At this time, the single-faced corrugated cardboard D1 is guided in a manner that the liner board C1 contacts the guide roller 184c and the corrugated core B1 is located on the outside.

[0082] The single-faced corrugated cardboard splicing detection unit 62 has a laser displacement meter 62a. The laser displacement meter 62a has an irradiation unit 62a-1 and a light receiving unit 62a-2. The irradiation unit 62a-1 irradiates, for example, a laser beam of a predetermined width. The irradiation unit 62a-1 irradiates the laser beam in the tangent direction of the single-faced corrugated cardboard D1 wound on the guide roller 184c. At this time, the irradiation unit 62a-1 irradiates the laser beam toward the core B1 of the waveform in the single-faced corrugated cardboard D1. The light receiving unit 62a-2 receives the laser beam irradiated by the irradiation unit 62a-1. The light receiving unit 62a-2 is arranged to face the irradiation destination of the laser beam irradiated from the irradiation unit 62a-1. The light receiving unit 62a-2 receives the laser beam irradiated from the irradiation unit 62a-1 and not blocked by the core B1 in the single-faced corrugated cardboard D1.

[0083] The single-faced corrugated cardboard D1 is guided by the guide roller 184c and conveyed. The irradiation unit 62a-1 irradiates the laser toward the core B1 of the single-faced corrugated cardboard D1 guided by the guide roller 184c. At this time, if the flute peak of the core B1 of the single-faced corrugated cardboard D1 is not crushed and deformed, the laser is blocked by the flute peak of the core B1. Therefore, the light receiving unit 62a-2 receives the laser whose width is reduced by being blocked by the flute peak of the core B1. On the other hand, if the flute peak of the core B1 of the single-faced corrugated cardboard D1 is crushed and deformed, the amount of laser blocked by the flute peak of the core B1 (flute peak deformation portion) is reduced. Therefore, the light receiving unit 62a-2 receives the laser whose width is not almost reduced by being blocked by the flute peak of the core B1. The control device 64 detects the paper splicing portion and the flute peak deformation portion based on the width of the laser input from the laser displacement meter 62a.

[0084] That is, the width of the laser of the single-faced corrugated cardboard D1 with normal fluting formed at the position of the non-paper splicing part is measured in advance. The judgment value (judgment area) is set based on the width of the laser measured at this time. In addition, the control device 64 detects the paper splicing part or the fluting deformed part by comparing the width of the laser input from the laser displacement meter 62a with the judgment value. That is, if the width of the laser input from the laser displacement meter 62a is within the range of the judgment value, the control device 64 determines that the single-faced corrugated cardboard D1 is a good product. And, if the width of the laser input from the laser displacement meter 62a exceeds the judgment value, the control device 64 determines that the fluting is deformed, that is, it is a defective product with a fluting deformed part. On the other hand, when the width of the laser input from the laser displacement meter 62a is less than the judgment value, the control device 64 determines that it is a defective product with a paper splicing part. In addition, the width of the laser of the single-faced corrugated cardboard D1 with normal fluting formed at the position of the paper splicing part can also be measured in advance, and the judgment value for the paper splicing part can be set.

[0085] In addition, the laser displacement meter 62a for detecting the splice and corrugation deformation of the single-faced corrugated cardboard D1 has been described above, but the laser displacement meter 62b for detecting the splice and corrugation deformation of the single-faced corrugated cardboard D2 is also the same.

[0086] <Flange deformation device>

[0087] Figure 7 This is a schematic diagram showing a corrugated peak deformation device.

[0088] exist Figure 7 As shown by the solid line, the flute deformation device 63 is arranged on the downstream side of the pick-up conveyor 28 in the cardboard conveying direction. The pick-up conveyor 28 has a first lower conveyor belt 172, a second lower conveyor belt 173 and an upper conveyor belt 174. The flute deformation device 63 crushes and deforms the corrugated core B1 of the single-face corrugated cardboard D1 conveyed by the conveyor belts 172, 173, 174 to form a flute deformation portion.

[0089] The corrugation deformation device 63 has a crushing device 63a. The crushing device 63a has: a rotating link 81, a crushing roller 82 and a driving device 83. The rotating link 81 is rotatably supported on a frame (not shown) by a mounting member 84. The crushing roller 82 is rotatably supported on the lower part of the rotating link 81 by a supporting member 85. The driving device 83 is mounted on a frame (not shown), and the front end of the driving rod 83a is connected to the upper part of the rotating link 81 by a connecting member 86. In addition, the driving device 83 is a fluid pressure cylinder such as an air cylinder or a hydraulic cylinder, but it can also be a driving motor. The crushing roller 82 is arranged above the guide roller supporting the second lower conveyor belt 173 with a predetermined gap. The predetermined gap is a gap in which the single-faced corrugated cardboard D1 supported by the guide roller can be conveyed without contacting the crushing roller 82.

[0090] Therefore, the single-faced corrugated cardboard D1 is conveyed by the pick-up conveyor 28. The control device 64 operates the crushing device 63a at a predetermined timing. The crushing device 63a is operated by the driving device 83, and the driving rod 83a is extended, so that the rotating link 81 is moved in a certain direction. Figure 7 Then, the crushing roller 82 moves in a manner close to the single-faced corrugated cardboard D1 guided by the second lower conveyor belt 173, and forms a corrugated peak deformation portion by crushing the corrugated peak of the core B1 in the single-faced corrugated cardboard D1. The laser displacement meter 62a of the single-faced corrugated cardboard splicing detection unit 62 detects the corrugated peak deformation portion formed by the crushing device 63a.

[0091] In addition, Figure 7 As shown by the double-dashed line, the crushing device 63a may be arranged on the upstream side in the conveying direction of the pickup conveyor 28. The crushing roller 82 is arranged above the guide roller supporting the first lower conveyor belt 172 with a predetermined gap. The predetermined gap is a gap in which the single-faced corrugated cardboard D1 supported by the guide roller can be conveyed without contacting the crushing roller 82. The crushing device 63a crushes the corrugated core B1 in the single-faced corrugated cardboard D1 conveyed by each conveyor belt 172, 173, 174 to deform it and form a corrugated peak deformation portion.

[0092] In addition, as the crushing device 63a, a crushing roller 82 is provided, but the crushing roller 82 may be a roller that can be driven or a rotating roller that can rotate with the crushing roller. In addition, it is not limited to the crushing roller 82, and it may be a crushing block or a crushing plate, etc., and its shape is not limited. In addition, the crushing roller 82 is supported by the rotating link 81 so as to be rotatable, but it may also be slidable.

[0093] Furthermore, although the crushing device 63a for the single-faced corrugated cardboard D1 has been described so far, the crushing device 63b for the single-faced corrugated cardboard D2 is also the same.

[0094] <Single-sided machine>

[0095] Figure 8 This is a schematic diagram of the peripheral portion of the single-facer machine for explaining the flow of the core, lining board, and single-faced corrugated cardboard. In addition, the single-facer machine 13 and the single-facer machine 17 have roughly the same structure, so the structure of the peripheral portion of the single-facer machine 13 is explained, and the description of the structure of the peripheral portion of the single-facer machine 17 is omitted.

[0096] like Figure 8 As shown, the base 101 of the base paper stand 11 is set at a predetermined position, and roller support arms 102a and 102b are provided on both sides in the X direction. The roller support arms 102a and 102b rotatably support the rolls R1 and R2 of the core B1 at the front end. The rolls R1 and R2 roll the core B1 of a predetermined length into a roll shape. For example, the base paper stand 11 rotates the roll R1 supported by one roller support arm 102a to supply the core B1, and stops the roll R2 supported by the other roller support arm 102b to wait for the core B1 to be connected.

[0097] The paper splicer 31 is arranged above the base paper stand 11 in the Z direction. The paper splicer 31 is configured to be provided with a pair of introduction rollers 104a, 104b, a pair of knives 105a, 105b, and a pair of pressure-bonding rods 106a, 106b as they approach the head 103 in the Z direction. The paper splicer 31 is provided with a clamping roller 107 and an accelerating roller 108 facing each other above the pressure-bonding rods 106a, 106b in the Z direction. The introduction rollers 104a, 104b, the knives 105a, 105b, and the pressure-bonding rods 106a, 106b are arranged to be able to approach and move away from each other in the X direction. The clamping roller 107 is arranged to be able to approach and move away from the accelerating roller 108 in the X direction. The head 103 is provided with a floating roller 109 and a fixed roller 110 above the clamping roller 107 and the accelerating roller 108 in the Z direction. Although not shown in the figure, there are multiple (for example, three) floating rollers 109, which can move freely in the horizontal direction according to the tension of the core B1. Figure 8 It is movable between the position shown and a position close to the fixed roller 110 .

[0098] Therefore, when the core B1 is fed out from the paper roll R1, the core B1 passes between the introduction rollers 104a and 104b, between the knives 105a and 105b, and between the pressure-bonding bars 106a and 106b, and is fed from the acceleration roller 108 through the floating roller 109 and through the fixed roller 110. When the paper is spliced ​​by the paper splicer 31, the feeding out of the core B1 from the paper roll R1 is stopped, and after the core B1 of the paper roll R1 is attached to the core B1 of the paper roll R2 on standby to perform the paper splicing, the paper roll R2 is rotated to feed out the core B1.

[0099] That is, the core B1 is fed out from the paper roll R2 and mounted on the crimping rod 106b. The feeding speed of the core B1 from the paper roll R1 is reduced, and the floating roller 109 moves toward the fixed roller 110, thereby starting to consume the retained core B1. Here, the feeding of the core B1 from the paper roll R1 is stopped, and the crimping rods 106a and 106b are brought close to each other, thereby crimping the core B1 from the paper roll R2 to the core B1 from the paper roll R1, and crimping them with an adhesive (double-sided tape). At the same time as this operation, the knife 105a advances and cuts the core B1 from the paper roll R1.

[0100] In this paper splicing, the tension of the core B1 is kept constant by the movement of the floating roller 109, and the retained core B1 is continuously fed out. When the core B1 from the roll paper R1 is cut and the core B1 is fed out from the roll paper R2, the core B1 contacts the acceleration roller 108 through the clamping roller 107, the rotation speed of the acceleration roller 108 increases, and the feeding of the retained core B1 is completed, and the floating roller 109 starts to move and returns to the original position.

[0101] In addition, the base paper stand 12 (reference Figure 1 ) and the paper splicer 33 connected to the lining board C1 are also roughly the same as the base paper rack 11 and the paper splicer 31.

[0102] The single-sided machine 13 includes a belt roller 121 , a tension roller 122 , a pressure belt 123 , an upper roller 124 , a lower roller 125 , and a glue coating device 126 .

[0103] The belt roller 121 can be driven to rotate by a driving device not shown in the figure. The tension roller 122 is supported to rotate freely at a predetermined interval from the belt roller 121. The pressure belt 123 is an endless belt and is wound between the belt roller 121 and the tension roller 122. The upper roller 124 can be driven to rotate by a driving device not shown in the figure, and the outer peripheral surface is formed in a wave shape. The upper roller 124 is arranged below the Z direction of the pressure belt 123 between the belt roller 121 and the tension roller 122, and the wave-shaped outer peripheral surface abuts against the lower surface of the pressure belt 123 in a pressurized state. Similar to the upper roller 124, the outer peripheral surface of the lower roller 125 is formed in a wave shape, and meshes with the outer peripheral surface of the upper roller 124 below the upper roller 124 in the Z direction. In addition, the belt roller 121, the tension roller 122, the upper roller 124, and the lower roller 125 are heated by circulating steam inside. The core B1 and the liner sheet C are heated via the pressure belt 123 and the upper roller 124 .

[0104] The glue coating device 126 is arranged near the upper roller 124 in the X direction. The glue coating device 126 includes a glue dam 127, a glue coating roller 128, an adjustment roller 129, and a glue scraper 130. The glue dam 127 stores a predetermined amount of glue. The glue coating roller 128 coats the glue by attaching the glue stored in the glue dam 127 to the center core B1 conveyed by the upper roller 124. The adjustment roller 129 contacts the outer peripheral surface of the glue coating roller 128 and rotates synchronously, thereby adjusting the amount of glue attached to the outer peripheral surface of the glue coating roller 128. The glue scraper 130 contacts the outer peripheral surface of the adjustment roller 129 to scrape off the excess glue removed from the glue coating roller 128 and attached to the outer peripheral surface of the adjustment roller 129.

[0105] The single-sided machine 13 is provided with a preheating roller 131 and an angle adjustment roller 132 for introducing the core B1 supplied from the paper splicer 31 between the upper roller 124 and the lower roller 125. The angle adjustment roller 132 adjusts the contact position of the core B1 and the outer peripheral surface of the preheating roller 131 by moving around the preheating roller 131. The single-sided machine 13 is provided with a preheating roller 133 and a fixing roller 134 for introducing the liner board C1 supplied from the paper splicer 33 between the pressure belt 123 and the upper roller 124.

[0106] The single-facer 13 includes a preheater 141 and a preheater 142. The preheater 141 preheats the lining sheet C1. The preheater 141 is arranged adjacent to the preheating roller 133. The preheater 141 includes two preheating rollers 151 and 152 arranged in the Z direction. The preheating rollers 151 and 152 heat the lining sheet C1 by winding the lining sheet C1 around them. The preheating rollers 151 and 152 include a winding amount adjustment device (not shown), and steam is supplied inside to heat the lining sheet C1 to a predetermined temperature. A plurality of guide rollers 153 are provided on the upstream and downstream sides of the preheating rollers 151 and 152.

[0107] The preheater 142 preheats the core B1. The preheater 142 is arranged adjacent to the preheating roller 131. The preheater 142 has a preheating roller 161 and an angle adjustment roller 163. The preheating roller 161 heats the core B1 by winding the core B1 around it. The angle adjustment roller 163 adjusts the contact position of the core B1 and the outer peripheral surface of the preheating roller 161 by moving around the preheating roller 161. The interior of the preheating roller 161 is supplied with steam and heated to a predetermined temperature. A guide roller 162 is provided on the upstream side of the preheating roller 161.

[0108] In addition, the single-facer 13 is provided with a pick-up conveyor 28 at the exit of the single-faced corrugated cardboard D1. The pick-up conveyor 28 guides the single-faced corrugated cardboard D1 formed in the single-facer 13 and supplies it to the bridge 14 (refer to Figure 1). The pick-up conveyor 28 includes: a first lower conveyor belt 172, a second lower conveyor belt 173, and an upper conveyor belt 174. The first lower conveyor belt 172 and the upper conveyor belt 174 are arranged to face obliquely upward, and the second lower conveyor belt 173 is arranged along the horizontal direction. The first lower conveyor belt 172, the second lower conveyor belt 173, and the upper conveyor belt 174 can be driven by a driving device not shown. The single-faced corrugated cardboard D1 is sandwiched between the first lower conveyor belt 172 and the second lower conveyor belt 173 and the upper conveyor belt 174 and is conveyed.

[0109] Therefore, the liner sheet C1 is supplied from the splicer 33 to the single-facer 13 via the preheater 141. After being wound around the preheating roller 133, the liner sheet C1 is transferred to the nip portion between the pressure belt 123 and the upper roller 124 together with the pressure belt 123 guided by the belt roller 121. On the other hand, the core B1 is supplied from the splicer 31 to the single-facer 13 via the preheater 142. After being wound around the preheating roller 131, the core B1 is processed into a wave shape at the meshing portion between the upper roller 124 and the lower roller 125, and is guided by the upper roller 124 and transferred to the nip portion between the pressure belt 113 and the upper roller 114.

[0110] The core B1 is processed into a wave shape at the meshing portion between the upper roller 124 and the lower roller 125, and then coated with glue by the glue coating device 126. The glue stored in the glue dam 127 is attached to the rotating glue coating roller 128, and the amount of glue attached to the outer peripheral surface is adjusted by the adjustment roller 129. The core B1 processed into a wave shape at the meshing portion between the upper roller 124 and the lower roller 125 is contacted with the glue coating roller 128 to coat the top of each corrugation with glue. When the glue-coated core B1 is transferred to the nip portion between the pressure belt 123 and the upper roller 124, it is attached to the liner board C1 to form a single-faced corrugated board D1.

[0111] In the single-sided machine 13, as the paper splicing detection section 61, an ultrasonic sensor 61a for detecting the paper splicing section of the core B1 and an ultrasonic sensor 61c for detecting the paper splicing section of the liner board C1 are provided. The ultrasonic sensor 61a is arranged between the fixed roller 110 of the paper splicer 31 and the guide roller 162 of the preheater 142. The ultrasonic sensor 61a detects the paper splicing section of the core B1 conveyed between the fixed roller 110 of the paper splicer 31 and the guide roller 162 of the preheater 142. In addition, the arrangement position of the ultrasonic sensor 61a is not limited to this position. The ultrasonic sensor 61a only needs to be arranged between the floating roller 109 of the paper splicer 31 and the preheating roller 131 of the single-sided machine 13. In addition, in this case, the floating roller 109 sends out the retained core B1 while moving when splicing, so it is preferably further downstream than the maximum movement position of the floating roller 109.

[0112] The ultrasonic sensor 61c is arranged between the guide rollers 153 of the preheater 141. The ultrasonic sensor 61c detects the paper splicing portion of the liner board C1 conveyed between the guide rollers 153 of the preheater 141. In addition, the arrangement position of the ultrasonic sensor 61c is not limited to this position. The ultrasonic sensor 61c only needs to be arranged between the floating roller 109 of the paper splicer 33 and the preheating roller 133 of the single-facer 13. In addition, at this time, the floating roller 109 moves while feeding out the retained liner board C1 when splicing the paper, so it is preferably located downstream of the maximum movement position of the floating roller 109.

[0113] The single-facer 13 is provided with a crushing device 63a as a flute deforming device 63 for forming a flute deformed portion on the single-face corrugated cardboard D1. The crushing device 63a is disposed on the downstream side of the pick-up conveyor 28 between the single-facer 13 and the bridge 14. The crushing device 63a crushes the core B1 of the single-face corrugated cardboard D1 formed by laminating the core B1 and the liner C1 into a corrugated shape by the single-facer 13 to deform the core B1, thereby forming a flute deformed portion.

[0114] Here, the arrangement positions of the ultrasonic sensors 61a and 61c as the sheet splicing detection unit 61 and the crushing device 63a as the flute deformation device 63 arranged at the peripheral portion of the single-facer 13 are described. Although not shown in the figure, the arrangement positions of the ultrasonic sensors 61b and 61d as the sheet splicing detection unit 61 and the crushing device 63b as the flute deformation device 63 arranged at the peripheral portion of the single-facer 17 are also the same.

[0115] <Double-sided machine>

[0116] Fig. 9 This is a schematic diagram of the periphery of a double-face machine for explaining the flow of a face liner and a single-face corrugated cardboard.

[0117] like Fig. 9 As shown, the paper guide device 30 is respectively provided at the exit of the bridge 14 and the bridge 18. The paper guide device 30 is provided with a twisting roller not shown in the figure, and the twisting roller contacts the upper surface of the single-faced corrugated cardboard D1 and the single-faced corrugated cardboard D2, that is, the lining board C1 and the lining board C2. In a state where the twisting roller contacts the single-faced corrugated cardboard, one end of the twisting roller is moved along the X direction by a moving device not shown in the figure. Then, the twisting roller is inclined in the X direction, and the single-faced corrugated cardboard D1 and the single-faced corrugated cardboard D2 are guided by the twisting roller. Thus, the Y-direction position of the single-faced corrugated cardboard D1 and the single-faced corrugated cardboard D2 is adjusted, and the conveyance that is snaking or deviating to either the Y direction is suppressed.

[0118] The preheater 20 is configured such that preheating rollers 41, 42, 43 are rotatably supported on a frame 181. The preheating rollers 41, 42, 43 heat the front liner A, the single-faced corrugated cardboard D2, and the single-faced corrugated cardboard D1. The preheating rollers 41, 42, 43 are provided with guide rollers 182a, 182b, 182c and winding angle adjustment rollers 183a, 183b, 183c on the upstream side in the conveying direction, and guide rollers 184a, 184b, 184c on the downstream side. The winding angle adjustment rollers 183a, 183b, 183c move along the circumferential direction of the preheating rollers 41, 42, 43, thereby adjusting the winding angles of the front liner A, the single-faced corrugated cardboard D2, and the single-faced corrugated cardboard D1 to adjust the preheating temperature.

[0119] The glue coating machine 21 is configured such that glue coating rollers 44 and 45 are rotatably supported on a frame 185. Each glue coating roller 44 and 45 applies glue of glue dams 186a and 186b to the respective cores B2 and B1 of the single-faced corrugated cardboard D2 and the single-faced corrugated cardboard D1. The glue coating rollers 44 and 45 are arranged in contact with adjustment rollers 187a and 187b for adjusting the amount of glue attached, and are arranged facing the paper pressing rollers 188a and 188b. The preheaters 190 and 191 of the double-faced machine 22 are rotatably supported on a frame 189. The front liner A is guided to the double-faced machine 22 via the preheater 190, and the single-faced corrugated cardboards D1 and D2 are guided to the double-faced machine 22 via the preheater 191.

[0120] As the paper splicing detection unit 61, an ultrasonic sensor 61e for detecting the splicing portion of the front liner A is provided. The ultrasonic sensor 61e is disposed between the fixed roller 111 of the paper splicer 35 and the guide roller 182a of the preheater 20. The ultrasonic sensor 61e detects the splicing portion of the front liner A conveyed between the fixed roller 111 of the paper splicer 35 and the guide roller 182a of the preheater 20. In addition, the configuration position of the ultrasonic sensor 61e is not limited to this position. The ultrasonic sensor 61e only needs to be disposed between the floating roller 109 of the paper splicer 35 and the preheater 190 of the double-sided machine 22. In addition, in this case, the floating roller 109 sends out the retained front liner A while moving when splicing paper, so it is preferably located downstream of the maximum movement position of the floating roller 109.

[0121] As the single-faced corrugated cardboard splice detection unit 62, laser displacement meters 62a and 62b for detecting the splice and corrugation deformation of the single-faced corrugated cardboards D1 and D2 are provided. The laser displacement meters 62a and 62b are arranged between the paper guide device 30 and the glue rollers 44 and 45 of the glue coater 21. More specifically, the laser displacement meters 62a and 62b are arranged between the preheating rollers 42 and 43 of the preheater 20 and the glue rollers 44 and 45 of the glue coater 21. The laser displacement meters 62a and 62b measure the thickness of the single-faced corrugated cardboards D1 and D2 conveyed between the paper guide device 30 and the glue rollers 44 and 45 of the glue coater 21. More specifically, the laser displacement meters 62 a and 62 b detect the splicing portion and the corrugation deformation portion based on the thickness of the single-faced corrugated cardboard D1 and D2 conveyed between the preheating rollers 43 and 42 of the preheater 20 and the glue coating rollers 45 and 44 of the glue coating machine 21 .

[0122] In addition, for example, the laser displacement meters 62a and 62b are arranged at positions facing the guide rollers 184c and 184b. Since the single-faced corrugated cardboard D1 and the single-faced corrugated cardboard D2 are in contact with the guide rollers 184c and 184b, the swing during transportation is suppressed, so the laser displacement meters 62a and 62b can detect the paper splicing part and the corrugation peak deformation part with high accuracy. In addition, the arrangement position of the laser displacement meters 62a and 62b is not limited to this position. The laser displacement meters 62a and 62b can be arranged between the bridges 14 and 18 and the double-sided machine 22.

[0123] <Specific structure of the control device>

[0124] The structure of the control device is described below. Figure 2 As shown, the control device 64 includes a paper splicing timing setting unit 71 , a determination unit 72 , and a bridge accumulation amount calculation unit 73 .

[0125] The paper splicing timing setting unit 71 sets the paper splicing timing of the front liner A, the core B1, B2, and the back liner C1, C2 in the splicers 31, 32, 33, 34, 35. The paper splicing timing setting unit 71 sets the paper splicing timing of the core B1, B2 and the back liner C1, C2 in the splicers 31 and 33, and the splicers 32 and 34, especially when switching batches. The paper splicing timing setting unit 71 sets the paper splicing timing of at least one of the splicers 31, 32 and the splicers 33, 34 so that at the bonding position of the core B1, B2 and the back liner C1, C2 after the corrugation process, the paper splicing portion of the back liner C1, C2 is located at the downstream side of the paper splicing portion of the core B1, B2 in the paperboard conveying direction.

[0126] That is, the paper splicing timing of the paper splicers 31, 32 and the paper splicers 33, 34 is set so that at the bonding position of the core B1, B2 and the liner boards C1, C2 after the corrugation process, the paper splicing section of the liner boards C1, C2 precedes the paper splicing section of the core B1, B2 by a predetermined distance set in advance. In this case, the paper splicing timing setting unit 71 sets the paper splicing timing of at least one of the paper splicers 31, 32 and the paper splicers 33, 34 based on the second distance from the paper splicing position of the core B1, B2 in the paper splicers 31, 32 to the paper splicing position of the single-facer 13, 17, the third distance from the paper splicing position of the liner boards C1, C2 in the paper splicers 33, 34 to the paper splicing position of the single-facer 13, 17, the conveying speed of the core B1, B2 and the liner boards C1, C2, and the corrugation ratio of the core B1, B2.

[0127] Here, the method of setting the splicing timing of the splicer 31 for splicing the core B1 and the splicer 33 for splicing the backing plate C1 is described. The method of setting the splicing timing of the splicer 32 for splicing the core B2 and the splicer 34 for splicing the backing plate C2 is also the same.

[0128] use Figure 8 The various reference numerals are explained. The second distance L2 is the distance from the paperboard splicing position P31 of the core B1 in the paper splicer 31 to the paperboard pasting position P13 in the single-facer 13. The third distance L3 is the distance from the paperboard splicing position P33 (not shown) of the liner board C1 in the paper splicer 33 to the paperboard pasting position P13 in the single-facer 13. The conveying speed V is the conveying speed of the cores B1, B2 and the liner boards C1, C2, and is the same speed. The corrugation ratio R is the ratio of the length of the core B1 before and after the corrugation process.

[0129] In the corrugated machine of this embodiment, the third distance L3 is longer than the second distance L2 according to the positional relationship between the splicer 31, the single-facer 13 and the splicer 33, and the relationship of the second distance L2 < the third distance L3 is established. The time TB for the splicer of the core B1 to reach the cardboard splicing position P13 of the single-facer 13 from the paper splicing position P31 of the splicer 31 is expressed as follows.

[0130]

[0131] On the other hand, the time TC when the paper splicing section of the liner board C1 reaches the paper sheet bonding position P13 of the single-facer 13 from the paper sheet splicing position P33 of the paper splicer 33 is expressed as follows.

[0132]

[0133] Here, because the second distance L2 is less than the third distance L3, TB (L2 / VR) is less than TC (L3 / V). That is, when the cores B1 and B2 are spliced ​​with the lining boards C1 and C2 simultaneously by the splicers 31 and 33, at the paperboard laminating position P13, the splicing part of the core B1 precedes the splicing part of the lining board C12 by a time difference ΔT (TC-TB) n. Therefore, under the above conditions, it is necessary to set the splicing timing at the paperboard laminating position P13 so that the splicing part of the lining board C12 precedes the splicing part of the core B1 by a predetermined distance N.

[0134] That is, at the paperboard pasting position P13, the paper splicing timing of the core B1 needs to be delayed relative to the paper splicing timing of the liner board C1 by the total time Tm (ΔT+Tn) of the time difference ΔT and the time Tn (N / V) corresponding to the predetermined distance N. In this case, the time TB1 when the paper splicing part of the core B1 arrives at the paperboard pasting position P13 of the single-facer 13 is TB+Tm (ΔT+Tn), and the condition of TB1>TC is as follows.

[0135]

[0136] In order to satisfy the mathematical formula, the control device 64 operates the splicers 31 and 32 at the set splicing timing. The control device 64 operates the splicers 31 and 33 respectively at the splicing timing of the paperboard based on the core B1 of the splicer 31 and the splicing timing of the liner board C1 based on the splicer 33 set by the splicing timing setting unit 71. Therefore, at the paperboard bonding position P13 of the single-facer 13, the splicing part of the liner board C1 is a predetermined distance N ahead of the splicing part of the core B1. Here, the predetermined distance N is a distance at which the splicing part of the liner board C1 and the splicing part of the core B1 are unlikely to have poor bonding, and a distance at which the poor length of the single-faced corrugated cardboard D1 does not become excessively long. The predetermined distance N is preferably a length shorter than the plate-shaped double-faced corrugated cardboard F cut by the cutter 25, for example, a length in the range of 100 mm to 600 mm.

[0137] In the above description, at the paperboard bonding position P13, as the paper splicing timing for making the paper splicing portion of the liner board C12 precede the paper splicing portion of the core B1 by a predetermined distance N, the paper splicing timing of the core B1 is delayed relative to the paper splicing timing of the liner board C1. That is, the control device 64 performs control to set the paper splicing timing of the paper splicer 33 of the liner board C1 to the same as before and delay the paper splicing timing of the paper splicer 33 of the core B1. In this case, the control device 64 only needs to control at least one of the paper splicing timing of the paper splicer 33 of the liner board C1 and the paper splicing timing of the paper splicer 33 of the core B1.

[0138] In the above description, the positional relationship among the paper splicer 31, the single-sided machine 13, and the paper splicer 33 is described as the second distance L2 < the third distance L3. However, even when the positional relationship among the paper splicer 31, the single-sided machine 13, and the paper splicer 33 is the second distance L2 > the third distance L3 or the second distance L2 = the third distance L3, the paper splicing timing of the core B1 and the paper splicing timing of the liner board C1 can be set by the same method.

[0139] return Figure 2 In addition, the paper splicing timing setting unit 71 sets the paper splicing timing of the front liner A based on the bridging retention amount of the single-faced corrugated cardboard D1. When the batch is replaced, the types of the front liner A, the core B1, and the back liner C1 are changed. At this time, the paper splicing timing setting unit 71 sets the paper splicing timing of the front liner A based on the bridging retention amount of the single-faced corrugated cardboard D1 calculated by the bridging retention amount calculation unit 73 described later. That is, the paper splicing timing setting unit 71 sets the paper splicing timing of the front liner A in such a way that the paper splicing portion of the front liner A and the paper splicing portions of the single-faced corrugated cardboard D1 are roughly consistent in the cardboard conveying direction.

[0140] The determination unit 72 determines whether the paper splicing section of the lining board C1 precedes the paper splicing section of the core B1 at the paperboard pasting position P13 of the single-facer 13. The ultrasonic sensor 61a is arranged between the paper splicer 31 and the single-facer 13, and the ultrasonic sensor 61c is arranged between the paper splicer 33 and the single-facer 13. The ultrasonic sensors 61a and 61c output the detection results to the control device 64. The ultrasonic sensor 61a detects the paper splicing section of the core B1, and the ultrasonic sensor 61c detects the paper splicing section of the lining board C1. The determination unit 72 compares the detection timing of the paper splicing section of the core B1 by the ultrasonic sensor 61a and the detection timing of the paper splicing section of the lining board C1 by the ultrasonic sensor 61c, and determines which one of the paper splicing section of the core B1 and the paper splicing section of the lining board C1 precedes.

[0141] The bridge accumulation amount calculation unit 73 calculates the bridge accumulation amount of the single-faced corrugated cardboard D1 accumulated in the bridge 14 based on the detection results of the cardboard splice detection unit 61 and the single-faced corrugated cardboard splice detection unit 62. Specifically, the bridge accumulation amount calculation unit 73 calculates the bridge accumulation amount based on the detection results of the paper splice portion of the backing board C1 by the ultrasonic sensor 61c and the detection results of the paper splice portion of the backing board C1 by the laser displacement meter 62a. The bridge accumulation amount calculation unit 73 calculates the bridge accumulation amount (length) of the single-faced corrugated cardboard D1 from the cardboard splice detection unit 61 to the single-faced corrugated cardboard splice detection unit 62 based on the time when the ultrasonic sensor 61c detects the paper splice portion of the backing board C1, the time when the laser displacement meter 62a detects the paper splice portion of the backing board C1, and the conveying speed of the single-faced corrugated cardboard D1.

[0142] In addition, when the determination unit 72 determines that the paper splicing section of the liner board C1 is ahead of the paper splicing section of the core B1 at the paperboard pasting position P13 of the single-facer 13, the bridge retention amount calculation unit 73 calculates the bridge retention amount based on the detection results of the paperboard splicing section detection unit 61 and the single-face corrugated paperboard splicing section detection unit 62. On the other hand, when the determination unit 72 determines that the paper splicing section of the liner board C1 is not ahead of the paper splicing section of the core B1 at the paperboard pasting position P13 of the single-facer 13, the bridge retention amount calculation unit 73 does not calculate the bridge retention amount based on the detection results of the paperboard splicing section detection unit 61 and the single-face corrugated paperboard splicing section detection unit 62.

[0143] In addition, the bridge retention amount calculation unit 73 can also calculate the bridge retention amount of the single-faced corrugated cardboard D1 retained in the bridge 14 based on the operation timing of the flute deformation device 63 (crushing device 63a) and the detection timing of the single-faced corrugated cardboard splicing detection unit 62. That is, the bridge retention amount calculation unit 73 calculates the bridge retention amount (length) of the single-faced corrugated cardboard D1 from the flute deformation device 63 to the single-faced corrugated cardboard splicing detection unit 62 based on the time when the flute deformation device 63 deforms the flute of the core B1, the time when the laser displacement meter 62a detects the flute deformation part of the core B1, and the conveying speed of the single-faced corrugated cardboard D1.

[0144] In addition, here, the processing of the core B1, lining board C1 and single-faced corrugated cardboard D1 based on the paper splicing timing setting unit 71, the judgment unit 72 and the bridging retention amount calculation unit 73 is explained, but the processing of the core B2, lining board C2 and single-faced corrugated cardboard D2 is also the same.

[0145] In addition, the control device 64 controls the operation timing of the defective product discharge device 26 based on the position information of the paper splice detected by the paper splice detection unit 61 and the position information of the corrugation peak deformation portion detected by the single-faced corrugated cardboard paper splice detection unit 62. The control device 64 operates the defective product discharge device 26 at a predetermined timing, thereby removing the double-faced corrugated cardboard F having the paper splice or the corrugation peak deformation portion from the conveyor line.

[0146] <Shape of single-faced corrugated cardboard>

[0147] Fig.10 This is a schematic diagram showing a single-faced corrugated cardboard. Fig.11 This is a schematic diagram showing the paper splicing section of a single-faced corrugated cardboard. Fig.12 This is a schematic diagram showing a defect in the paper splicing section of a single-faced corrugated cardboard. Fig.13 This is a schematic diagram showing the corrugation deformation portion of a single-faced corrugated cardboard.

[0148] like Fig.10As shown, for example, a single-faced corrugated cardboard D1 is formed by pasting a sheet-shaped lining board C1 on a corrugated core B1. If there is no paper splicing portion between the core B1 and the lining board C1, and the shape of the flute peak of the core B1 is appropriate, the single-faced corrugated cardboard D1 has a normal thickness H1. In addition, the thickness of the single-faced corrugated cardboard D1 may vary due to manufacturing errors, so the normal thickness H1 is preferably set to a normal thickness range H1a to H1b. In addition, the same is true for the single-faced corrugated cardboard D2.

[0149] like Fig.11 As shown, as described above, paper splicing is performed in such a manner that, at the bonding position between the core B1 and the lining board C1, the paper splicing portion C1c of the lining board C1 is located at a position downstream of the paper splicing portion B1c of the core B1 in the cardboard conveying direction X1. At this time, at the paper splicing portion B1c of the core B1, the shape of the flute peak becomes inappropriate, so that poor bonding between the core B1 and the lining board C1 is likely to occur within a predetermined length from the position of the paper splicing portion B1c of the core B1. However, in the single-faced corrugated cardboard D1, the paper splicing portion C1c of the lining board C1 precedes, so even if poor bonding occurs at the paper splicing portion B1c of the core B1, the thickness can be measured at the position where the paper splicing portion C1c of the lining board C1 is located. At this time, the single-faced corrugated cardboard D1 becomes thicker than the normal thickness H1 by an amount equivalent to the thickness of one sheet of the lining board C1 and the thickness of the double-sided tape Tc, and becomes a thickness H2 (H1<H2). The control device 64 (refer to Figure 3 ) Based on the determination result of H1<H2, the paper splicing portion C1c of the liner board C1 in the single-face corrugated cardboard D1 is detected.

[0150] On the other hand, Fig.12 As shown, if the bonding position of the core B1 and the lining board C1 is Fig.11 On the contrary, if the paper splicing portion B1c of the core B1 is located at the upstream side of the paper splicing portion C1c of the liner board C1 in the paperboard conveying direction X1, the paper splicing portion B1c of the core B1 of the single-faced corrugated paperboard D1 will be ahead of the paper splicing portion C1c of the liner board C1. At this time, the shape of the flute peak becomes inappropriate at the paper splicing portion B1c of the core B1, so that the core B1 and the liner board C1 are likely to be poorly attached within a predetermined length from the position of the paper splicing portion B1c of the core B1. In this case, the thickness of the single-faced corrugated paperboard D1 cannot be measured at the position where the paper splicing portion C1c of the liner board C1 exists.

[0151] In addition, if Fig.13As shown, the single-faced corrugated cardboard D1 is formed by pasting a cardboard-shaped liner C1 to a corrugated core B1, but the corrugation of the core B1 is crushed to form a corrugation deformation portion B1d. The main reasons for the formation of the corrugation deformation portion B1d are intentional reasons caused by the operation of the corrugation deformation device 63 and natural reasons caused by malfunction of the single-face machine 13. At this time, the single-faced corrugated cardboard D1 has a corrugation deformation portion B1d in the core B1, so it becomes thinner than the normal thickness H1 and becomes a thickness H3 (H3 Figure 3 ) Based on the determination result of H3

[0152] In addition, although the case of the single-faced corrugated cardboard D1 is described here, the same is true for the single-faced corrugated cardboard D2.

[0153] <Operation of the corrugated cardboard manufacturing device>

[0154] Fig.14 This is a flow chart showing a method for manufacturing corrugated cardboard.

[0155] The manufacturing method of corrugated cardboard includes the following steps: connecting the preceding cardboard of the core B1, B2 to the succeeding cardboard, connecting the preceding cardboard of the lining boards C1, C2 to the succeeding cardboard, controlling the paper splicing timing of the core B1, B2 and at least one of the lining boards C1, C2 so that at the bonding position of the core B1, B2 and the lining boards C1, C2, the paper splicing portion of the lining boards C1, C2 is located at a position downstream of the paper splicing portion of the core B1, B2 in the cardboard conveying direction X1, and detecting the paper splicing portion of the lining boards C1, C2 based on the thickness of the single-faced corrugated cardboard D1, D2 formed by bonding the core B1, B2 and the lining boards C1, C2.

[0156] like Figure 3 and Fig.14 As shown, in step S11, the control device 64 starts the operation of the corrugator 10. At this time, the corrugator 10 is equipped with predetermined types of surface liner A, core B1, B2 and lining C1, C2. In step S12, the control device 64 operates the flute peak deformation device 63, and in step S13, the control device 64 starts to count the flute peaks of the core B1, B2 after the flute peak deformation device 63 operates.

[0157] ​​In step S14, the control device 64 determines whether the single-faced corrugated cardboard paper splicing detection unit 62 detects a flute deformation portion. Here, if it is determined that the single-faced corrugated cardboard paper splicing detection unit 62 does not detect a flute deformation portion (no), the control device 64 directly waits. On the other hand, if the control device 64 determines that the single-faced corrugated cardboard paper splicing detection unit 62 detects a flute deformation portion (yes), then in step S15, the control device 64 ends the counting of the flute numbers of the cores B1 and B2, and in step S16, the control device 64 calculates the bridging retention amount based on the counted flute numbers of the cores B1 and B2, the conveying speed, and the corrugation rate. And, in step S17, the control device 64 starts producing corrugated cardboard.

[0158] In step S18, the control device 64 determines whether to change the batch. The control device 64 determines whether to change the batch, for example, based on whether there is a batch change signal input from a production management device (not shown). Here, if the control device 64 determines that the batch is not to be changed (No), the production of corrugated cardboard is continued. On the other hand, if the control device 64 determines that the batch is to be changed (Yes), then in step S19, the control device 64 starts the paper splicing control for changing the types of the top liner A, the core B1, B2, and the back liner C1, C2.

[0159] That is, the control device 64 controls the splicing timing of the front liner A, the core B1, B2, and the back liner C1, C2 based on the splicers 31, 32, 33, 34, 35. Specifically, the control device 64 controls the splicing timing of at least one of the splicers 31, 32 and the splicers 33, 34 so that the splicing portion of the back liner C1, C2 is located at the downstream side of the splicing portion of the core B1, B2 in the paperboard conveying direction at the bonding position of the core B1, B2 and the back liner C1, C2 after the corrugation process. In addition, the control device 64 controls the splicing timing of the front liner A based on the bridging retention amount of the single-face corrugated paperboards D1, D2.

[0160] In step S20, the control device 64 determines whether the paper splicing detection unit 61 detects the paper splicing parts of the cores B1 and B2 and the paper splicing parts of the lining boards C1 and C2. Here, if it is determined that the paper splicing detection unit 61 does not detect all the paper splicing parts of the cores B1 and B2 and the lining boards C1 and C2 (No), the control device 64 directly waits. On the other hand, if the control device 64 determines that the paper splicing detection unit 61 detects all the paper splicing parts of the cores B1 and B2 and the lining boards C1 and C2 (Yes), then in step S21, the tracking of each paper splicing part of the cores B1 and B2 and the lining boards C1 and C2 is started.

[0161] In step S22, the control device 64 determines whether the paper splicing section of the lining boards C1 and C2 is ahead of the paper splicing section of the core B1 and B2 at the bonding position between the core B1 and B2 and the lining boards C1 and C2. Here, if the control device 64 determines that the paper splicing section of the lining boards C1 and C2 is ahead of the paper splicing section of the core B1 and B2 at the bonding position between the core B1 and B2 and the lining boards C1 and C2 (yes), then in step S23, it is determined whether the single-faced corrugated cardboard paper splicing detection section 62 detects the paper splicing section of the lining boards C1 and C2. Here, if it is determined that the single-faced corrugated cardboard paper splicing detection section 62 does not detect all the paper splicing sections of the lining boards C1 and C2 (no), the control device 64 directly waits.

[0162] On the other hand, if the control device 64 determines that the single-faced corrugated cardboard splice detection unit 62 detects all the splices of the lining boards C1 and C2 (Yes), then in step S24, the control device 64 recalculates the bridge retention amount based on the detection timing of the splices of the lining boards C1 and C2 by the cardboard splice detection unit 61, the detection timing of the splices of the lining boards C1 and C2 by the single-faced corrugated cardboard splice detection unit 62, the lining boards C1 and C2, and the conveying speed. In addition, the bridge retention amount calculated in step S16 is replaced with the bridge retention amount calculated in step S24.

[0163] In addition, in step S22, if the control device 64 determines that the paper splicing part of the lining boards C1 and C2 does not advance ahead of the paper splicing part of the cores B1 and B2 at the bonding position between the cores B1 and B2 and the lining boards C1 and C2 (No), the bridging retention amount is not calculated again.

[0164] In addition, when the batch replacement of the liner boards C1 and C2 is not performed but only the batch replacement of the surface liner boards A or the cores B1 and B2 is performed, the recalculation of the bridge retention amount by the control device 64 in step S24 is not performed. In addition, when the paper splicing is caused by insufficient roll paper of the liner boards C1 and C2 instead of the batch replacement of the liner boards C1 and C2, the recalculation of the bridge retention amount by the control device 64 in step S24 may be performed.

[0165] In the above description, when the operation of the corrugator 10 starts, the corrugation peak deformation device 63 is operated, and the single-face corrugated board splicing detection unit 62 detects the corrugation peak deformation part, thereby calculating the bridging retention amount, but the timing of calculating the bridging retention amount is not limited to this timing, and it can also be implemented at any timing. In this case, it can be implemented without the splicing part of the lining boards C1 and C2 in advance, and it can also be implemented at any timing based on the operator.

[0166] [Effects of this embodiment]

[0167] The first embodiment of the corrugated cardboard manufacturing device comprises: paper splicers (second paper splicers) 31, 32, which connect the following cardboard to the preceding cardboard in the cores B1, B2; paper splicers (third paper splicers) 33, 34, which connect the following cardboard to the preceding cardboard in the lining boards C1, C2; a single-faced corrugated cardboard splicing detection unit 62, which detects the splicing part of the lining boards C1, C2 based on the thickness of the single-faced corrugated cardboard D1, D2 formed by bonding the cores B1, B2 and the lining boards C1, C2; and a control unit 64, which controls the splicing timing of at least one of the paper splicers 31, 32 and the paper splicers 33, 34, so that at the bonding position of the cores B1, B2 and the lining boards C1, C2, the splicing part of the lining boards C1, C2 is located at a position downstream of the splicing part of the cores B1, B2 in the cardboard conveying direction X1.

[0168] According to the manufacturing apparatus of the corrugated cardboard of the first embodiment, the control device 64 controls the timing of paper splicing, so that at the bonding position of the core B1, B2 and the lining boards C1, C2, the paper splicing portion of the lining boards C1, C2 is ahead of the paper splicing portion of the core B1, B2. Therefore, even if the bonding between the core B1, B2 and the lining boards C1, C2 is poor at the paper splicing portion of the core B1, B2, the core B1, B2 and the lining boards C1, C2 are properly bonded at the paper splicing portion of the lining boards C1, C2. Therefore, the single-faced corrugated cardboard paper splicing detection unit 62 can properly detect the thickness of the single-faced corrugated cardboard D1, D2 at the position of the paper splicing portion of the lining boards C1, C2 ahead of the paper splicing portion of the core B1, B2. As a result, it is possible to suppress the detection obstruction of the paper splicing portion of the second paperboard caused by poor lamination between the cores B1, B2 and the liner boards C1, C2 at the paper splicing portion of the liner boards C1, C2.

[0169] The second embodiment of the manufacturing device for corrugated cardboard is based on the first embodiment of the manufacturing device for corrugated cardboard, and further, the control device 64 controls the paper splicing timing of the paper splicers 31, 33 and the paper splicers 32, 34, so that at the bonding position of the core B1, B2 and the lining boards C1, C2, the paper splicing part of the lining boards C1, C2 is a predetermined distance ahead of the paper splicing part of the core B1, B2. As a result, the paper splicing part of the core B1, B2 and the paper splicing part of the lining boards C1, C2 are close to within a predetermined distance, and the defective length of the corrugated cardboard including the paper splicing part of the core B1, B2 and the paper splicing part of the lining boards C1, C2 can be shortened.

[0170] The third embodiment of the corrugated cardboard manufacturing device is based on the first embodiment or the second embodiment of the corrugated cardboard manufacturing device, and the control device 64 further includes a paper splicing timing setting unit 71, which sets the paper splicing timing of the splicers 31, 33 and the splicers 32, 34 based on the second distance from the paper splicing position of the splicers 31, 33 to the bonding position, the third distance from the paper splicing position of the splicers 32, 34 to the bonding position, the conveying speed of the cores B1, B2 and the lining boards C1, C2, and the corrugation rate of the cores B1, B2. In this way, the paper splicing timing of the lining boards C1, C2 based on the splicers 31, 33 and the paper splicing timing of the cores B1, B2 based on the splicers 32, 34 can be appropriately set.

[0171] The manufacturing device of corrugated cardboard of the fourth embodiment is based on the manufacturing device of any one of the first to third embodiments, and further comprises: ultrasonic sensors (third cardboard splice detection unit) 61c, 61d, which detect the splice based on the thickness of the lining boards C1, C2 at the upstream side of the bonding position in the cardboard conveying direction; bridges 14, 18, which cause the single-faced corrugated cardboards D1, D2 to be retained; and a bridge retention amount calculation unit 73, which calculates the retention amount of the single-faced corrugated cardboards D1, D2 in the bridges 14, 18 based on the detection timing of the splice of the lining boards C1, C2 detected by the ultrasonic sensors 61c, 61d and the single-faced corrugated cardboard splice detection unit 62. Thus, the retention amount of the single-faced corrugated cardboards D1, D2 in the bridges 14, 18 can be calculated with high accuracy.

[0172] The manufacturing device of the corrugated cardboard of the fifth embodiment is based on the manufacturing device of the corrugated cardboard of the fourth embodiment, and further includes ultrasonic sensors (second cardboard splicing parts) 61a, 61b, which detect the splicing parts based on the thickness of the cores B1, B2 at the upstream side of the bonding position in the cardboard conveying direction, and the control device 64 includes a determination unit 72 for determining whether the splicing parts of the lining boards C1, C2 are ahead of the splicing parts of the cores B1, B2. Therefore, by confirming whether the splicing parts of the lining boards C1, C2 are ahead of the splicing parts of the cores B1, B2 through the determination unit 72, the retention amount in the bridges 14, 18 can be appropriately calculated.

[0173] The sixth embodiment of the manufacturing device for corrugated paperboard is based on the fifth embodiment of the manufacturing device for corrugated paperboard, and further, when the determination unit 72 determines that the paper splicing part of the lining boards C1 and C2 is ahead of the paper splicing part of the core B1 and B2, the bridge retention amount calculation unit 73 calculates the retention amount, and when the determination unit 72 determines that the paper splicing part of the core B1 and B2 is ahead of the paper splicing part of the lining boards C1 and C2, the bridge retention amount calculation unit 73 does not calculate the retention amount. In this way, the retention amount in the bridges 14 and 18 can be calculated with high accuracy.

[0174] The seventh embodiment of the manufacturing device of corrugated cardboard is based on the manufacturing device of any one of the first to sixth embodiments, and further comprises a flute deformation device 63 for deforming the core B1 and B2 in the single-faced corrugated cardboard D1 and D2, the single-faced corrugated cardboard splicing detection unit 62 can detect the deformed flute portion deformed by the flute deformation device 63, and the bridge retention amount calculation unit 73 calculates the retention amount of the single-faced corrugated cardboard D1 and D2 in the bridges 14 and 18 based on the deformation timing of the flute deformation device 63 deforming the core B1 and B2 and the detection timing of the deformed flute portion by the single-faced corrugated cardboard splicing detection unit 62. Thus, the retention amount in the bridges 14 and 18 can be calculated without detecting the splicing portion of the liner boards C1 and C2.

[0175] The eighth embodiment of the method for manufacturing corrugated cardboard has the following steps: connecting the preceding cardboard in the cores B1 and B2 to the succeeding cardboard; connecting the preceding cardboard in the lining boards C1 and C2 to the succeeding cardboard; controlling the timing of paper splicing between the cores B1 and B2 and at least one of the lining boards C1 and C2 so that at the bonding position between the cores B1 and B2 and the lining boards C1 and C2, the paper splicing portion of the lining boards C1 and C2 is located at a position downstream of the paper splicing portion of the cores B1 and B2 in the cardboard conveying direction X1; and detecting the paper splicing portion of the lining boards C1 and C2 based on the thickness of the single-faced corrugated cardboard D1 and D2 formed by bonding the cores B1 and B2 to the lining boards C1 and C2. Thus, even if the core B1, B2 and the lining boards C1, C2 are poorly bonded at the paper joint of the core B1, B2, the core B1, B2 and the lining boards C1, C2 are properly bonded at the paper joint of the lining boards C1, C2. Thus, the single-faced corrugated cardboard paper splice detection unit 62 can properly detect the thickness of the single-faced corrugated cardboard D1, D2 at the paper splice of the lining boards C1, C2 that precedes the paper splice of the core B1, B2. As a result, it is possible to suppress the obstruction of the detection of the paper splice of the second cardboard caused by the poor bonding between the core B1, B2 and the lining boards C1, C2 at the paper splice of the lining boards C1, C2.

[0176] Description of Reference Numerals

[0177] 10Corrugated cardboard machine (a device for manufacturing corrugated cardboard)

[0178] 11, 12, 15, 16, 19 base paper racks

[0179] 13, 17 single-sided machine

[0180] 14.18 Bridge Building

[0181] 20 Pre-heater

[0182] 21 Glue coating machine

[0183] 22 double-sided machine

[0184] 23 Rotary shearing machine

[0185] 24 Slitting and creasing machine

[0186] 25 Cutting machine

[0187] 26Defective product discharge device

[0188] 27Paper stacker

[0189] 28, 29 Pick-up conveyor

[0190] 30 Paper guide device

[0191] 31, 32 paper splicer (second paper splicer)

[0192] 33, 34 paper splicer (third paper splicer)

[0193] 35 Paper splicer (first paper splicer)

[0194] 41, 42, 43 preheating rollers

[0195] 44, 45 Glue coating roller

[0196] 61 Cardboard splicing detection unit

[0197] 61a, 61b Ultrasonic sensor (second paper splicing detection unit)

[0198] 61c, 61d Ultrasonic sensor (third paper splicing detection unit)

[0199] 61e Ultrasonic Sensor

[0200] 62 Single-sided corrugated cardboard splicing detection unit

[0201] 62a, 62b Laser displacement meter

[0202] 63 Flute deformation device

[0203] 63a, 63b crushing device

[0204] 64 control devices

[0205] 71 Paper receiving timing setting unit

[0206] 72 Judgment Department

[0207] 73 Bridge Detention Calculation Department

[0208] A-sheet liner (first paperboard)

[0209] B1, B2 core (second paperboard)

[0210] C1, C2 lining board (third paper board)

[0211] D1, D2 single-faced corrugated cardboard

[0212] E, F double-sided corrugated cardboard.

Claims

1. A corrugated paperboard manufacturing device, which conveys a corrugated paperboard formed by laminating a first paperboard, a second paperboard after corrugation processing, and a third paperboard, The manufacturing device of the corrugated paperboard comprises: A second paper receiving device is used to connect the preceding paperboard in the second paperboard to the succeeding paperboard; A third paper receiving device, for connecting the preceding paperboard in the third paperboard to the succeeding paperboard; a single-faced corrugated paperboard splicing detection unit, for detecting a third splicing unit of the third paperboard based on the thickness of the single-faced corrugated paperboard formed by laminating the second paperboard and the third paperboard; and A control device controls the paper splicing timing of at least one of the second paper splicing device and the third paper splicing device so that at the bonding position of the second paper board and the third paper board, the third paper splicing portion is located at a downstream side of the second paper splicing portion of the second paper board in the paper board conveying direction.

2. The manufacturing device for corrugated cardboard according to claim 1, wherein: The control device controls the paper splicing timing of the second paper splicing device and the third paper splicing device so that the third paper splicing portion precedes the second paper splicing portion by a preset predetermined distance at the bonding position.

3. The manufacturing device for corrugated cardboard according to claim 1 or 2, wherein: The control device includes a paper splicing timing setting unit, which sets the paper splicing timing of the second paper splicing device and the third paper splicing device based on a second distance from the second paper splicing position of the second paper splicing device to the pasting position, a third distance from the third paper splicing position of the third paper splicing device to the pasting position, a conveying speed of the second paperboard and the third paperboard, and a corrugation rate of the second paperboard.

4. The manufacturing device for corrugated cardboard according to claim 1, wherein: The manufacturing device of the corrugated cardboard comprises: a third cardboard splicing detection unit, which detects the third cardboard splicing unit based on the thickness of the third cardboard at the upstream side of the bonding position in the cardboard conveying direction; a bridge to cause the single-faced corrugated cardboard to be retained; and a bridge retention amount calculation unit, which calculates the retention amount of the single-faced corrugated cardboard in the bridge based on the detection timing of the third cardboard splicing unit detected by the third cardboard splicing detection unit and the single-faced corrugated cardboard splicing detection unit.

5. The manufacturing device for corrugated cardboard according to claim 4, wherein: The corrugated cardboard manufacturing device includes a second cardboard paper splicing detection unit, which detects the second paper splicing unit based on the thickness of the second cardboard at the upstream side of the bonding position in the cardboard conveying direction, and the control device includes a determination unit that determines whether the third paper splicing unit is ahead of the second paper splicing unit.

6. The manufacturing device for corrugated cardboard according to claim 5, wherein: The bridging retention amount calculation unit calculates the retention amount when the determination unit determines that the third paper splicing unit advances before the second paper splicing unit, and does not calculate the retention amount when the determination unit determines that the second paper splicing unit advances before the third paper splicing unit.

7. The manufacturing device of corrugated board according to claim 4, wherein: The manufacturing device of the corrugated cardboard has a flute deformation device for deforming the second cardboard in the single-faced corrugated cardboard, the single-faced corrugated cardboard paper splicing detection unit can detect the deformed flute portion deformed by the flute deformation device, and the bridge retention amount calculation unit calculates the retention amount of the single-faced corrugated cardboard in the bridge based on the deformation timing when the flute deformation device deforms the second cardboard and the detection timing when the single-faced corrugated cardboard paper splicing detection unit detects the deformed flute portion.

8. A method for manufacturing a corrugated paperboard, comprising: manufacturing the corrugated paperboard by laminating a first paperboard, a second paperboard after corrugation processing, and a third paperboard; The manufacturing method of the corrugated paperboard has the following steps: Connecting the preceding paperboard in the second paperboard to the subsequent paperboard; Connecting the preceding paperboard in the third paperboard to the subsequent paperboard; Controlling the paper splicing timing of at least one of the second paperboard and the third paperboard so that, at the bonding position of the second paperboard and the third paperboard, the third paper splicing portion of the third paperboard is located downstream of the second paper splicing portion of the second paperboard in the paperboard conveying direction; and The third paper splicing portion is detected based on the thickness of a single-faced corrugated cardboard formed by bonding the second cardboard and the third cardboard.

Images