JP2020032608A - Elimination device and method of defective sheet, and production apparatus of cardboard sheet - Google Patents

Abstract

To improve operation efficiency by eliminating a defective sheet not depending on a sheet length in an elimination device and method of a defective cardboard sheet and in a production apparatus of a cardboard sheet.SOLUTION: An elimination device of a defective sheet comprises: a cut-off (cutting device) 25 that cuts a continuous double-faced cardboard sheet E in a width direction; splicing part detection devices 51a, 51b, 51c, 51d, and 51e as a defective detection device that detect defective parts of double-faced cardboard sheets E and F; single corrugated sheet defective detection devices 52a and 52b; quality inspection devices 53a and 53b; and defective detection switches 54a and 54b; a defective discharging device 26 that discharges a tabular double-faced cardboard sheet F including a defective part; and a control device 55 that activates the defective discharging device 26 according to the detection result by the defective detecting device and controls the cut-off 25 to cut the double-faced cardboard sheet F including the defective part to a length shorter than a discharging permissible length when a length of the tabular double-faced cardboard sheet F is longer than the discharging permissible length of the defective discharging device 26.SELECTED DRAWING: Figure 2

Description

  The present invention provides, for example, a sheet defect removing device and method for removing defective products of a corrugated cardboard sheet manufactured by bonding a front liner, a corrugated core, and a back liner, and a sheet defect removing device. The present invention relates to an apparatus for manufacturing a corrugated cardboard sheet.

  A corrugating machine as a corrugated cardboard sheet manufacturing apparatus includes a single facer for forming a single-sided corrugated cardboard sheet, a double facer for forming a double-sided corrugated cardboard sheet by bonding a front liner paper to the single-sided corrugated cardboard sheet, and a continuous double-faced corrugated cardboard sheet. It is provided with a slitter scorer for cutting into a width and a cutoff for cutting a continuous double-faced corrugated cardboard sheet into a predetermined length. The single facer forms the corrugated core and forms a single-sided corrugated cardboard sheet by laminating the back liner. The double facer forms a double-sided corrugated cardboard sheet by laminating the front liner to the single-side corrugated cardboard sheet. The continuous double-faced corrugated cardboard sheet manufactured by the double facer is cut to a predetermined width by a slitter scorer, and cut to a predetermined length by a cutoff to form a plate-like corrugated cardboard sheet.

  As described above, the double-faced corrugated cardboard sheet is manufactured by laminating the front liner, the corrugated core, and the back liner, but as a front liner, a preprint liner that has already been printed on the surface is used. May be used. Usually, the cut-off is performed by cutting a continuous corrugated cardboard sheet into a predetermined length, thereby obtaining a plate-shaped corrugated cardboard sheet. On the other hand, in the corrugated cardboard sheet using the preprint liner, a cutting mark is printed in advance at a cutting position, and the cutoff is performed by detecting the cutting mark and cutting a continuous cardboard sheet at the position of the cutting mark. And a plate-shaped corrugated cardboard sheet having a predetermined length according to the design. As an apparatus for manufacturing a corrugated cardboard sheet using a preprint liner, for example, there is one described in the following Patent Document.

JP 2006-062243 A JP 2005-297101 A

  By the way, in corrugated machine, the corrugated cardboard sheet is regarded as a defective part such as a paper spliced part or a deformed part of the corrugated core, and a plate-shaped corrugated cardboard sheet with this defective part is regarded as a defective product from the conveyance line during production. Discharged outside. That is, when the detecting device detects a defective portion of the corrugated cardboard sheet, or when the operator determines that it is defective, and performs a predetermined operation, the cutoff cuts the corrugated cardboard sheet into a predetermined length, and then the plate with the defective portion is cut off. The corrugated cardboard sheet is removed from the transport line by a defective product discharging device. In this case, the defective product discharging device puts the corrugated cardboard sheet of the defective product removed from the transport line into a defective product collection box, or transports the defective cardboard sheet to a collecting station or a shredder by a discharge conveyor crossing the transport line. As a result, the defective product collection box and the discharge conveyor become longer than the entire length of the plate-shaped corrugated cardboard sheet. In some cases, a large arrangement space is required, and it is difficult to arrange the defective box near the transport line. Further, if the cardboard sheet has no cutting mark printed in advance at the cutting position, it is possible to change the cutting length to an arbitrary length when a defect occurs, but in the case of a cardboard sheet using a preprint liner, the cutting length can be changed. If a defective cardboard sheet of a size that cannot be removed from the transport line occurs because it is cut based on the mark, the operator has to remove it manually from the transport line, which places a heavy burden on the operator, There is a problem that efficiency is not good.

  The present invention solves the above-mentioned problems, and a sheet defect removing apparatus and method for appropriately removing a defective corrugated cardboard sheet from a transport line regardless of the sheet length to improve work efficiency, and An object of the present invention is to provide an apparatus for manufacturing a corrugated cardboard sheet.

  In order to achieve the above object, a sheet defect removing apparatus according to the present invention is directed to a sheet-shaped corrugated cardboard sheet having a predetermined length formed by bonding a first liner, a corrugated core, and a second liner. In a sheet defect removing device for removing a defective product, a cutting device for cutting a corrugated cardboard sheet along a width direction, a defect detecting device for detecting a defective portion of the corrugated cardboard sheet, and a plate-shaped corrugated cardboard sheet including the defective portion are provided. A defective product discharge device that discharges from the transport line, and the defective product discharge device is operated according to the detection result of the defective detection device, and the length of the plate-shaped corrugated cardboard sheet is longer than the discharge allowable length of the defective product discharge device. And a control device for controlling the cutting device so as to cut the corrugated cardboard sheet including the defective portion to a length shorter than the discharge allowable length.

  Therefore, when the defect detecting device detects a defective portion of the cardboard sheet, the control device operates the defective product discharging device according to the detection result of the defect detecting device, and discharges the plate-shaped cardboard sheet including the defective portion from the transport line. I do. At this time, when the length of the plate-shaped corrugated cardboard sheet is longer than the allowable discharge length of the defective product discharge device, the control device controls the cutting device to reduce the length of the corrugated cardboard sheet including the defective portion to a length shorter than the allowable discharge length. Cut into pieces. Then, the corrugated cardboard sheet including the defective portion becomes shorter than the allowable discharge length, and the corrugated cardboard sheet including the defective portion can be properly discharged from the transport line by the defective product discharging device. As a result, regardless of the length of the corrugated cardboard sheet, the defective corrugated cardboard sheet can be properly removed from the transport line to improve the working efficiency.

  In the sheet defect removing apparatus of the present invention, when the length of the plate-shaped corrugated cardboard sheet is longer than the discharge allowable length, the control device moves the corrugated cardboard sheet including the defective portion over the length range of the predetermined length or more. It is characterized in that the cutting device is controlled so as to cut to a length shorter than the discharge allowable length.

  Therefore, since the corrugated cardboard sheet including the defective portion is cut into a short length over a length range equal to or longer than the predetermined length, the corrugated cardboard sheet including the defective portion can be appropriately discharged from the transport line.

  In the sheet defect removing device of the present invention, the cutting device forms a plate-like corrugated cardboard sheet by cutting a continuous corrugated cardboard sheet to a predetermined first cutting length set in advance in the width direction. The control device may be configured such that when the length of the plate-shaped corrugated cardboard sheet is longer than the allowable discharge length, the second cutting unit sets the cut length of the corrugated cardboard sheet including the defective portion to be an integer fraction of the first cut length. It is characterized by changing to long.

  Therefore, the cutting device cuts a continuous corrugated cardboard sheet to a first cutting length to form a plate-shaped corrugated cardboard sheet. The continuous corrugated cardboard sheet has a defective portion, and the length of the plate-shaped corrugated cardboard sheet is Is longer than the discharge allowable length, the cutting length is changed to a second cutting length shorter than the first cutting length. Therefore, the corrugated cardboard sheet including the defective portion is cut shorter than the discharge allowable length, and can be easily discharged by the defective product discharge device.

  In the sheet defect removing apparatus of the present invention, the control device cuts the corrugated cardboard sheet including the defective portion by the second cutting length by the integer, and then changes the second cutting length to the first cutting length. It is characterized by doing.

  Therefore, after the corrugated cardboard sheet including the defective portion is cut shorter than the discharge allowable length and discharged, the second cut length is returned to the first cut length. Therefore, the cutting device can cut a continuous corrugated cardboard sheet into a predetermined first cutting length to continuously form a plate-shaped corrugated cardboard sheet.

  In the sheet defect removing apparatus according to the present invention, after the controller changes the first cutting length to the second cutting length, if the corrugated cardboard sheet does not have the defective portion, the controller cuts the second cutting length to the first cutting length. The feature is to change to the cutting length.

  Therefore, after the corrugated cardboard sheet including the defective portion is cut short and discharged, when there is no defective portion in the corrugated cardboard sheet, the second cut length is returned to the first cut length. Therefore, the cutting device can cut a continuous corrugated cardboard sheet into a predetermined first cutting length to continuously form a plate-shaped corrugated cardboard sheet.

  In the sheet defect removing apparatus according to the present invention, the first liner has a cutting mark indicating a cutting position printed on a surface thereof, and a mark detection for detecting the cutting mark upstream of the cutting apparatus in the conveying direction of the cardboard sheet. A device is provided, and the control device controls the operation of the cutting device at a position obtained by adding a preset margin length to the second cutting length when the cutting mark is not present at the position of the second cutting length. It is characterized by doing.

  Therefore, when there is a cutting mark on the surface of the first liner, the control device controls the operation of the cutting device in accordance with the detection time of the cutting mark by the mark detecting device, and the continuous corrugated cardboard sheet is made to have the first cutting length. Disconnect. The control device changes the first cut length to the second cut length when the corrugated cardboard sheet is in a defective portion and the length is longer than the discharge allowable length, but the cutting mark is located at the position of the second cut length. Since there is no margin, the corrugated cardboard sheet including the defective portion is cut at a position obtained by adding the extra length to the second cutting length. Therefore, the corrugated cardboard sheet including the defective portion is cut shorter than the discharge allowable length, and can be easily discharged by the defective product discharge device.

  In the sheet defect removing device of the present invention, the control device controls a normal cutting mode for controlling the operation of the cutting device based on a first cutting length, and controls the operation of the cutting device based on the cutting mark. A preprint cutting mode, wherein the first cutting length is changed to the second cutting length when switching between the normal cutting mode and the preprint cutting mode.

  Therefore, the controller changes the mode from the first cutting length to the second cutting length when switching from the normal cutting mode to the preprint cutting mode or when switching from the preprint cutting mode to the normal cutting mode. A corrugated cardboard sheet including a paper splicing portion generated at the time of switching can be cut short, and can be properly discharged by a defective product discharging device.

  In the sheet defect removing apparatus according to the present invention, the defective portion is at least one of a paper spliced portion, a core deformed portion, a defective print portion, a scratch, a stain, and an adhesive residue.

  Therefore, a corrugated cardboard sheet including a defective portion such as a paper splicing portion, a core deformed portion, or a defective printing portion can be appropriately cut into short pieces and discharged.

  Further, the method for removing defects of the sheet of the present invention is a step of cutting a double-faced corrugated cardboard sheet formed by laminating liners on both sides of a corrugated core to a predetermined length along a width direction. A step of detecting a defective portion of the corrugated cardboard sheet, and a step of cutting the corrugated cardboard sheet including the defective portion to a length shorter than the allowable discharge length when the length of the plate-shaped corrugated cardboard sheet is longer than the allowable discharge length, Discharging a plate-shaped corrugated cardboard sheet cut to a length shorter than the discharge allowable length from a transport line.

  Therefore, when the length of the plate-shaped corrugated cardboard sheet is longer than the allowable discharge length, the corrugated cardboard sheet including the defective portion is cut into a length shorter than the allowable discharge length. Then, the corrugated cardboard sheet including the defective portion becomes shorter than the allowable discharge length, and the corrugated cardboard sheet including the defective portion can be properly discharged from the transport line by the defective product discharging device. As a result, regardless of the length of the corrugated cardboard sheet, the defective corrugated cardboard sheet can be properly removed from the transport line to improve the working efficiency.

  The corrugated cardboard sheet manufacturing apparatus according to the present invention may further include a single facer for manufacturing a single-sided corrugated cardboard sheet by bonding a second liner to the corrugated core, and a first liner on the single-sided corrugated cardboard sheet side. And a double facer for manufacturing a double-faced corrugated cardboard sheet, and a sheet defect removing device.

  Therefore, a single facer produces a single-sided corrugated cardboard sheet by laminating a second liner to the corrugated core, and a double facer provides a first liner on the central side of a single-sided corrugated cardboard sheet produced by a single facer. The two-sided corrugated cardboard sheet is manufactured by laminating, and the cutting device cuts the two-sided corrugated cardboard sheet into a predetermined length along the width direction. At this time, the control device discharges the corrugated cardboard sheet including the defective portion from the transport line by the defective product discharging device, but when the length of the plate-shaped corrugated cardboard sheet is longer than the discharge allowable length of the defective product discharging device, the control device causes the cutting device to operate. Activate to cut the corrugated cardboard sheet containing the defective portion into a length shorter than the allowable discharge length. Then, the corrugated cardboard sheet including the defective portion becomes shorter than the allowable discharge length, and the corrugated cardboard sheet including the defective portion can be properly discharged from the transport line by the defective product discharging device. As a result, regardless of the length of the corrugated cardboard sheet, the defective corrugated cardboard sheet can be properly removed from the transport line to improve the working efficiency.

  ADVANTAGE OF THE INVENTION According to the sheet | seat defect removal apparatus and method of this invention, and the manufacturing apparatus of a corrugated cardboard sheet, regardless of the length of a corrugated cardboard sheet, the sheet | seat which is a defective article is removed from a conveyance line appropriately, and the improvement of work efficiency is improved. Can be planned.

FIG. 1 is a schematic diagram illustrating a corrugating machine as a corrugated sheet manufacturing apparatus according to the present embodiment. FIG. 2 is a configuration diagram illustrating a sheet defect removing apparatus according to the present embodiment. FIG. 3 is a schematic diagram illustrating a defective product discharging device. FIG. 4 is a schematic diagram illustrating an operation of a cutoff in a normal state in the preprint cutting mode. FIG. 5 is a schematic diagram showing a cutoff operation when a defective portion occurs in the preprint cutting mode. FIG. 6 is a time chart showing the operation of the defect removing device when switching from the normal cutting mode to the preprint cutting mode. FIG. 7 is a time chart showing the operation of the defect removing device in the preprint cutting mode. FIG. 8 is a time chart showing the operation of the defect removing device when switching from the preprint cutting mode to the normal cutting mode.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Exemplary embodiments of the present invention will be explained in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited by the embodiments, and when there are a plurality of embodiments, the embodiments include a combination of the embodiments.

  FIG. 1 is a schematic diagram illustrating a corrugating machine as a corrugated sheet manufacturing apparatus according to the present embodiment.

  In the present embodiment, as shown in FIG. 1, a corrugating machine 10 as a corrugated cardboard sheet manufacturing apparatus firstly attaches a back liner (second liner) C1 to a corrugated core B1 to form a single-sided corrugated cardboard sheet D1. To manufacture. Next, the front liner (first liner) A is attached to the core B1 of the manufactured single-sided cardboard sheet D1 to manufacture a continuous double-sided cardboard sheet E1. Then, by cutting the continuous double-faced corrugated paperboard sheet E1 to a predetermined length, a plate-like double-faced corrugated paperboard sheet F1 can be manufactured. The corrugating machine 10 firstly manufactures the single-sided corrugated cardboard sheet D1 and also attaches the back liner (second liner) C2 to the corrugated core B2 to produce the single-sided corrugated cardboard sheet D2. Next, the back liner C2 of the single-sided cardboard sheet D2 is bonded to the center B1 of the manufactured single-sided cardboard sheet D1, and the front liner (first liner) A is bonded to the center B2 of the single-sided cardboard sheet D2. To produce a double-sided double-faced corrugated cardboard sheet E2. Then, by cutting the continuous double-sided corrugated cardboard sheet E2 to a predetermined length, a plate-shaped double-sided corrugated cardboard sheet F2 can be manufactured.

  The corrugating machine 10 includes a mill roll stand 11 for the core B1, a mill roll stand 12 for the back liner C1, a single facer 13, a bridge 14, a mill roll stand 15 for the center B2, and a mill for the back liner C2. Roll stand 16, single facer 17, bridge 18, mill roll stand 19 of front liner A, preheater 20, glue machine 21, double facer 22, rotary shear 23, slitter scorer 24, cut-off (Cutting device) 25, defective product discharging device 26, and stacker 27.

  Each of the mill roll stands 11 and 15 is provided with a roll paper in which the cores B1 and B2 are formed on both sides, respectively. Is provided. When paper is fed from one roll paper, the other roll paper is mounted and paper splicing preparation is performed. When one roll paper runs short, the other roll paper is replaced with the other roll paper. Be spliced. Therefore, paper is continuously fed downstream from each of the mill roll stands 11 and 15.

  The mill roll stands 12 and 16 are provided with roll paper on each side of which the back liners C1 and C2 are wound in a roll shape, and a splicer 28 for splicing between the roll papers. . When paper is fed from one roll paper, the other roll paper is mounted and paper splicing preparation is performed. When one roll paper runs short, the other roll paper is replaced with the other roll paper. Be spliced. Therefore, the paper is continuously fed from each of the mill roll stands 12 and 16 to the downstream side.

  The cores B1, B2 fed from the mill roll stands 11, 15 and the back liners C1, C2 fed from the mill roll stands 12, 16 are preheated by preheaters (not shown), respectively. Each preheater has a heating roll into which steam is supplied, and heats the cores B1 and B2 and the back liners C1 and C2 to a predetermined temperature by being wound around the heating roll and transported.

  The single facer 13 forms the single-sided corrugated cardboard sheet D1 by processing the heated core B1 into a wavy shape, gluing it to the top of each step, and bonding the heated back liner C1. The single facer 13 is provided with a pick-up conveyor at an obliquely upper portion on the downstream side in the transport direction, and transports the single-faced cardboard sheet D1 formed by the single facer 13 to the bridge 14. The bridge 14 absorbs the speed difference between the single facer 13 and the double facer 22, so that the single-sided cardboard sheet D1 can temporarily stay.

  The single facer 17 also processes the heated core B2 into a corrugated shape, glues it to the top of each step, and attaches the heated back liner C2 to form a single-sided cardboard sheet D2. The single facer 17 is provided with a pickup conveyor obliquely above the downstream side in the transport direction, and transports the single-faced cardboard sheet D2 formed by the single facer 17 to the bridge 18. The bridge 18 absorbs the speed difference between the single facer 17 and the double facer 22, so that the single-faced cardboard sheet D2 can temporarily stay.

  The mill roll stand 19 is provided with roll paper on each side of which a front liner A is wound in a roll shape, and a splicer 28 for splicing between the roll papers is provided. When paper is fed from one roll paper, the other roll paper is mounted and paper splicing preparation is performed. When one roll paper runs short, the other roll paper is replaced with the other roll paper. Be spliced. Therefore, paper is continuously fed from the mill roll stand 19 to the downstream side.

  The preheater 20 includes three preheating rolls 31, 32, and 33 arranged in a vertical direction. The preheating roll 31 heats the front liner A, the preheating roll 32 heats the single-sided cardboard sheet D2, and the preheating roll 33 heats the single-sided cardboard sheet D1. Each of the preheating rolls 31, 32, and 33 has a winding amount adjusting device (not shown), and is supplied with steam and heated to a predetermined temperature. D2, the preheating can be performed by winding the single-sided corrugated cardboard sheet D1.

  The glue machine 21 has glue rolls 34 and 35 arranged in a vertical direction. The gluing roll 34 performs gluing by contacting each top of the core B2 in the single-sided corrugated cardboard sheet D2 heated by the preheating roll 32. The gluing roll 35 performs gluing by contacting each top of the core B1 in the single-sided corrugated cardboard sheet D1 heated by the preheating roll 33. The single-faced cardboard sheets D1 and D2 glued by the glue machine 21 are transferred to the double facer 22 in the next step. The front liner A heated by the preheating roll 31 is also transferred to the double facer 22 through the glue machine 21.

  The double facer 22 has an upstream heating section 36 and a downstream cooling section 37 along the running line of each single-faced cardboard sheet D1, D2 and the front liner A. The single-sided corrugated cardboard sheets D1 and D2 and the front liner A glued by the glue machine 21 are carried between the pressure belt and the hot plate in the heating section 36, and are integrally cooled while overlapping each other. Transported to section 37. During this transfer, the single-faced corrugated cardboard sheets D1 and D2 and the front liner A are heated while being pressurized to be bonded to each other to form a continuous double-faced corrugated cardboard sheet E2, which is then naturally cooled while being conveyed. When manufacturing the double-faced corrugated cardboard sheet E1, since the single-sided corrugated cardboard sheet D2 is not manufactured, the single-sided corrugated cardboard sheet D1 and the front liner A are heated while being pressed, so that the two-sided corrugated cardboard sheets E1 are bonded to each other and continuous. Becomes

  The double-faced cardboard sheet E2 (double-faced cardboard sheet E1) manufactured by the double facer 22 is transferred to the rotary shear 23. This rotary shear 23 cuts the full width or partial cut of the double-faced corrugated cardboard sheet E2 in the width direction when the lamination is stabilized in the initial stage of operation. The slitter scorer 24 cuts the wide double-sided double-faced corrugated cardboard sheet E2 along the transport direction so as to have a predetermined width, and processes a ruled line extending in the transport direction. The slitter scorer 24 includes a first slitter scorer unit 38 and a second slitter scorer unit 39 which are arranged along the conveying direction of the double-sided corrugated cardboard sheet E2 and have substantially the same structure. The wide double-faced corrugated cardboard sheet E2 is cut by the slitter scorer 24 to form a double-faced double-faced corrugated cardboard sheet E2.

  The cut-off 25 cuts the double-sided corrugated cardboard sheet E2 cut in the conveying direction by the slitter scorer 24 along the width direction to form a plate-shaped double-sided corrugated cardboard sheet F2 (double-sided corrugated cardboard sheet F1) having a predetermined length. To form. The defective product discharge device 26 discharges the double-sided double-faced corrugated paperboard sheet F2 detected as a defective product from the transport line. Factors that cause defective products include, for example, poor splicing, deformation of the core, scratches, dirt, and adhesion of glue residue. The stacker 27 is for stacking the double-sided double-faced corrugated cardboard sheet F2 determined as a non-defective product and discharging it as a product outside the machine.

  Note that, as described above, the corrugating machine 10 of the present embodiment can manufacture the plate-shaped double-sided corrugated cardboard sheet F1 and the plate-shaped double-sided corrugated cardboard sheet F2. However, the cutting process and the cutting process described below are almost the same operation process. Therefore, in the following description, the continuous double-sided corrugated cardboard sheet E1 and the continuous double-sided corrugated cardboard sheet E2 are represented as a continuous double-sided corrugated cardboard sheet E, and the plate-shaped double-sided corrugated cardboard sheet F1 and the plate-shaped double-sided corrugated cardboard sheet F2 are referred to as plate-shaped. Expressed as a double-faced cardboard sheet F.

  Here, the sheet defect removing apparatus of the present embodiment will be described. The corrugating machine 10 finally forms the plate-like double-faced corrugated paperboard sheet F by cutting the double-faced corrugated paperboard sheet E having the continuous cutoff 25 to a predetermined cutting length. The sheet defect removing device discharges the plate-shaped double-faced corrugated cardboard sheet F including the defective portion detected in the manufacturing process of the plate-shaped double-faced corrugated cardboard sheet F as a defective product from the transport line by the defective product discharging device 26. However, in the defective product discharging device 26, the discharge allowable length of the plate-shaped double-faced corrugated cardboard sheet F is set for reasons such as structure or arrangement space, and the plate-shaped double-faced corrugated cardboard sheet longer than the discharge allowable length. F cannot be discharged. Therefore, in the present embodiment, the double-faced corrugated cardboard sheet E including the defective portion is cut into a plurality of sheets shorter than the discharge allowable length and discharged.

  Hereinafter, the sheet defect removing apparatus of the present embodiment will be described in detail. FIG. 2 is a configuration diagram illustrating a sheet defect removing device according to the present embodiment, and FIG. 3 is a schematic diagram illustrating a defective product discharging device.

  As shown in FIG. 2, a sheet defect removing apparatus 50 of the present embodiment is a plate-shaped double-faced corrugated cardboard formed by bonding a front liner A, corrugated cores B1, B2 and back liners C1, C2. This is to remove defective products of the sheet F (F1, F2). The sheet defect removing device 50 includes a cutoff 25 as a cutting device, a paper spliced portion detecting device 51 (51a, 51b, 51c, 51d, 51e) as a defect detecting device, and a single-stage defect detecting device 52 (52a, 52b). , A quality inspection device 53 (53a, 53b), a failure detection switch 54 (54a, 54b), a defective product discharging device 26, a control device 55, and a cutoff control device 56.

  As shown in FIG. 3, the cutoff 25 cuts the double-faced cardboard sheet E along the width direction to form a plate-shaped double-faced cardboard sheet F having a predetermined cutting length. The cutoff 25 has a conveyor 61 and a pair of upper and lower cutting rolls 62 and 63. Therefore, the cut-off 25 forms the plate-shaped double-faced corrugated paperboard sheet F by cutting the double-faced corrugated paperboard sheet E transported by the transport conveyor 61 by the pair of upper and lower cutting rolls 62 and 63. The defective product discharging device 26 discharges a plate-shaped double-faced corrugated cardboard sheet F including a defective portion from the transport line. The defective product discharging device 26 includes a first transport conveyor 64, a second transport conveyor 65, a first discharge conveyor 66, a second discharge conveyor 67, and a distribution roll 68.

  The first transport conveyor 64 has a horizontal transport section 64a and a downward transport section 64b, and receives and transports a plate-shaped double-faced cardboard sheet F cut at the cutoff 25. The second transport conveyor 65 is arranged continuously downstream of the horizontal transport section 64a in the first transport conveyor 64, and receives and transports a plate-shaped double-faced cardboard sheet F transported as a non-defective product. The first discharge conveyor 66 is arranged continuously downstream of the downward conveying portion 64b of the first conveying conveyor 64, and receives and conveys a plate-shaped double-faced cardboard sheet F0 discharged as a defective product. The second discharge conveyor 67 is arranged continuously downstream of the first discharge conveyor 66, and receives and transports a plate-shaped double-faced corrugated cardboard sheet F0 discharged as a defective product. In the present embodiment, the second discharge conveyor 67 conveys and discharges the plate-shaped double-faced corrugated cardboard sheet F0 along a horizontal direction intersecting the conveyance line of the plate-shaped double-faced corrugated cardboard sheet F.

  The distribution roll 68 is disposed above the first transport conveyor 64 between the horizontal transport section 64a and the downward transport section 64b. The distribution roll 68 is vertically movable. Therefore, when the plate-shaped double-faced corrugated cardboard sheet F determined to be non-defective is conveyed, the distribution roll 68 is made to stand by at the rising position, so that the non-defective plate-shaped double-faced corrugated cardboard sheet F is transported from the horizontal conveying section 64a to the second conveying section 64a. It is transported to the transport conveyor 65. On the other hand, when the plate-shaped double-faced corrugated cardboard sheet F determined to be defective is conveyed, the distribution roll 68 is lowered to move the defective plate-shaped double-faced corrugated cardboard sheet F0 from the horizontal conveying section 64a to the downward conveying section. 64b, and discharged using the first discharge conveyor 66 and the second discharge conveyor 67.

  The stacker 27 is for stacking the plate-shaped double-faced corrugated cardboard sheets F determined to be non-defective and discharging the products outside the machine. The stacker 27 has a plurality of conveyors 69, 70, 71 and a stacking stand (not shown). The non-defective plate-shaped double-faced corrugated cardboard sheets F are sent to the stacker 27, stacked and conveyed by the conveyors 69, 70, 71, and then stacked on the stacking table.

  Further, the corrugating machine 10 of the present embodiment can manufacture a plate-shaped double-faced corrugated cardboard sheet F using a preprint liner. The preprint liner has a predetermined pattern, character, or the like printed on the surface in advance, and the preprint liner is used as the front liner A. The front liner A (preprint liner) has not only pictures and characters but also a cutting mark indicating a cutting position printed on the surface. Therefore, the mark detection device 75 is disposed upstream of the cutoff 25 in the transport direction of the plate-shaped double-faced corrugated cardboard sheet F. The mark detection device 75 includes a support base 76 and a mark sensor 77 mounted on the support base 76. The front liner A is located on the lower surface side of the plate-shaped double-faced corrugated cardboard sheet F to be conveyed, and the cutting mark is printed on the front surface (lower surface). Is arranged to face the lower surface side.

  Here, the spliced portion detection device 51 (51a, 51b, 51c, 51d, 51e), the single-stage defect detection device 52 (52a, 52b), and the quality inspection device 53 (53a, 53b) as the above-described defect detection device. And the failure detection switch 54 (54a, 54b) will be described. As shown in FIG. 2 and FIG. 3, the spliced portion detecting device 51 is disposed on the splicer 28, and the splicer 28 is formed of paper of the front liner A, the core B (B1, B2), and the back liner C (C1, C2). The splicing is detected, and a sheet splicing signal is output to the control device 55. Based on the splicing signal input from the splicing portion detection device 51, the control device 55 controls the conveying speed of the front liner A, the core B, and the back liner C, the conveying distance from the splicing position to the cutoff 25, and From this, the time required for the paper spliced portion as the defective portion to reach the cutoff 25 is calculated. Further, the control device 55 similarly calculates the arrival time from the cutoff 25 to the defective product discharging device 26.

  The single-stage failure detection device 52 is disposed in the preheater 20 or the glue machine 21. The single-stage defect detection device 52 detects the deformation of the core B in the single-sided cardboard sheet D formed by attaching the corrugated core B to the back liner C. The one-stage defect detection device 52 includes, for example, an imaging device, and compares the captured image of the core B which is a good product with the captured image of the core B being conveyed, which is captured by the imaging device. The quality of the single-faced cardboard sheet D is determined by detecting the deformation of B. The single-stage defect detection device 52 outputs a pass / fail judgment signal of the single-sided cardboard sheet D to the control device 55. The control unit 55 cuts the defective portion based on the transport speed of the single-sided corrugated cardboard sheet D and the transport distance from the single-stage defect detection device 52 to the cutoff 25 based on the pass / fail judgment signal input from the single-stage defect detection device 52. The time to reach OFF 25 is calculated. Further, the control device 55 similarly calculates the arrival time from the cutoff 25 to the defective product discharging device 26.

  The quality inspection device 53 is disposed above and below the plate-shaped double-faced corrugated cardboard sheet F to be conveyed between the slitter scorer 24 and the cutoff 25. The quality inspection device 53 includes, for example, an imaging device, and inspects the shape and dimensions of the plate-shaped double-faced corrugated cardboard sheet F and the printing state when a preprint liner is used, based on an image captured by the imaging device. Specifically, by comparing a non-defective plate-shaped double-faced corrugated cardboard sheet F with a photographed image of the plate-shaped double-faced corrugated cardboard sheet F being conveyed captured by the imaging device, the plate-shaped double-faced corrugated cardboard sheet F is compared. Is determined. Based on the pass / fail judgment signal input from the quality inspection device 53, the control device 55 determines the defective portion based on the transport speed of the plate-shaped double-faced corrugated cardboard sheet F and the transport distance from the quality inspection device 53 to the cutoff 25. The time to reach the cutoff 25 is calculated. Further, the control device 55 similarly calculates the arrival time from the cutoff 25 to the defective product discharging device 26.

  The failure detection switch 54 is disposed around the slitter scorer 24 and the cutoff 25. The defect detection switch 54 is operable by an operator, and is operated when a defective portion (for example, a scratch, dirt, or adhesive residue) is found on the double-faced cardboard sheets E and F being conveyed by the operator. The control device 55 calculates the time required for the defective portion to reach the cutoff 25 in the same manner as described above, based on the defective portion detection signal input from the defect detection switch 54. Further, the control device 55 similarly calculates the arrival time from the cutoff 25 to the defective product discharging device 26.

  The control device 55 activates the defective product discharging device 26 in accordance with the detection results of the paper spliced portion detection device 51, the single-stage defect detection device 52, the quality inspection device 53, and the defect detection switch 54 as the defect detection devices. In this case, the control device 55 is configured to output a splicing signal from the splicing portion detection device 51, a pass / fail judgment signal from the one-stage defect detection device 52 or the quality inspection device 53, and a defective portion detection signal from the defect detection switch 54, The time required for the defective portion to reach the cutoff 25 is calculated. Further, the control device 55 calculates the arrival time from the cutoff 25 to the defective product discharging device 26. Therefore, when the defective portion reaches the defective product discharging device 26, the control device 55 operates the defective product discharging device 26 to discharge the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion to the outside from the transport line.

  When the length L of the plate-shaped double-faced corrugated cardboard sheet F0 is longer than the allowable discharge length Ld of the defective product discharging device 26, the control device 55 outputs the continuous double-sided corrugated cardboard sheet E including the defective portion to the allowable discharge length. The cutoff 25 is controlled so as to cut to a length shorter than Ld. That is, the defective product discharging device 26 sends the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion from the first transport conveyor 64 to the first discharge conveyor 66 by the distribution roll 68, and orthogonally intersects the transport line with the first discharge conveyor 66. And discharged to the outside by the second discharge conveyor 67. The second discharge conveyor 67 conveys the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion in the direction perpendicular to the paper surface of FIG. 3, and has a discharge allowable length Ld set in the width direction. Therefore, if the cut length L of the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion due to the cut-off 25 is longer than the discharge allowable length Ld, the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion by the second discharge conveyor 67 as it is. Cannot be discharged outside. In the present embodiment, the continuous double-faced corrugated cardboard sheet E including the defective portion is cut into a length shorter than the allowable discharge length Ld. That is, the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion longer than the discharge allowable length Ld is cut into a plurality of sheets by the cutoff 25 and discharged.

  Here, the operation of the cutoff 25 in the preprint cutting mode will be described. FIG. 4 is a schematic diagram illustrating a normal cutoff operation in the preprint cutting mode, and FIG. 5 is a schematic diagram illustrating a cutoff operation when a defective portion occurs in the preprint cutting mode.

  As shown in FIGS. 2 and 4, the preprint cutting mode is a method in which a plate-shaped double-faced corrugated cardboard sheet F is used as a front liner A using a preprint liner on which a cutting mark M is printed on the surface together with a pattern or character. This is the manufacturing mode. In the preprint cutting mode, the mark detecting device 75 detects the cutting mark M printed on the lower surface side of the plate-shaped double-faced corrugated cardboard sheet F by the mark sensor 77 and sends a mark detection signal to the cut-off control device 56. Is output. Based on the mark detection signal, the cutoff control device 56 determines a cutting mark of the continuous double-faced cardboard sheet E based on the transport speed of the continuous double-faced cardboard sheet E and the transport distance from the mark detection device 75 to the cutoff 25. The time required for M to reach the cutting position by the cutoff 25 is calculated, and the cutting position is controlled at the position of the cutting mark M by controlling the rotational direction position of the knife cylinder that cuts the double-faced cardboard sheet F.

  When manufacturing the plate-shaped double-faced corrugated paperboard sheet F having the length L, the cut length by the cutoff 25 is the first cut length L. When the cutting length is the first cutting length L, the continuous double-faced corrugated cardboard sheet E is printed with the cutting mark M for each first cutting length L. Therefore, the cutoff control device 56 activates the cutoff 25 at a predetermined timing based on the mark detection signal from the mark detection device 75, and cuts (cuts) the continuous double-faced cardboard sheet E at the position of the cutting mark M. Line CL). Note that when the mark detection device 75 cannot detect the cutting mark M, the cutoff control device 56 knows the length of the first cutting length L in advance, so that the cutoff control device 56 prevents The cutoff 25 is operated at a length obtained by adding the margin length Lm to the cutting length L, and the continuous double-faced corrugated cardboard sheet E is cut.

  On the other hand, as shown in FIGS. 2 and 5, for example, when the defective portion Pf as a paper seam of the continuous double-faced corrugated cardboard sheet E reaches the cutoff 25, the control device 55 The defective product discharging device 26 is operated based on the paper splicing signal to discharge the plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion Pf from the transport line. At this time, when the length of the plate-shaped double-faced corrugated cardboard sheet F is longer than the discharge allowable length Ld, the control device 55 changes the cutting length from the first cutting length L to half of the first cutting length L (an integer n). It is changed to the second cutting length L / 2, which is (1/1). Here, the integer is a natural number, excluding “0”.

  For example, when the first cut length L is 1700 mm and the discharge allowable length Ld is 1600 mm, the defective product discharging device 26 discharges a plate-shaped double-faced corrugated cardboard sheet F0 having a length of 1700 mm from the transport line. Can not. At this time, the cutting length is changed from the first cutting length L to the second cutting length L / 2. Since the half of the first cutting length L (1700 mm) is 850 mm, which is equal to or less than the discharge allowable length Ld, the second cutting length is set to one half of the first cutting length L. When the first cut length L is 3600 mm and the discharge allowable length Ld is 1600 mm, one third of the first cut length L (1700 mm) is 1200 mm and is equal to or less than the discharge allowable length Ld. Therefore, the second cut length is set to one third of the first cut length L.

  Therefore, the cutoff control device 56 operates the cutoff 25 at a predetermined timing based on the mark detection signal from the mark detection device 75 and the paper splice signal from the paper splice portion detection device 51. That is, when the defective portion Pf reaches the cutoff 25, the control device 55 instructs the cutoff control device 56 to change the first cut length L (1700 mm) to the second cut length L / 2 (850 mm). I do. The cut-off control device 56 operates the cut-off 25 and at a position separated by a second cutting length L / 2 (850 mm) from the position of the cutting mark M obtained by cutting the double-faced corrugated cardboard sheet E where the cut-off 25 is continuous. An attempt is made to cut a continuous double-faced cardboard sheet E. Here, in the preprint cutting mode, basically, the double-faced corrugated cardboard sheet E in which the cutoff 25 is continuous at the position of the cutting mark M is cut. However, since there is no cutting mark M at the position of the second cutting length L / 2 (850 mm), the cut-off control device 56 has a margin Lm in the second cutting length L / 2 to avoid not cutting. The cut-off 25 is operated at the length (860 mm) to which (for example, 10 mm) is added, and the continuous double-faced corrugated cardboard sheet E is cut.

  Thereafter, the controller 55 cuts again at the cutting mark M in the preprint mode, so that the length of the defective portion n times the second cutting length (twice when the second cutting length L / 2) is used. If the sheet is not continuously conveyed, the cutting length of the continuous double-faced cardboard sheet E is changed from the second cutting length L / 2 to the first cutting length L. Then, the cutoff control device 56 activates the cutoff 25 at a predetermined timing based on the mark detection signal from the mark detection device 75, and cuts (cuts) the continuous double-faced corrugated cardboard sheet E at the position of the cutting mark M. Line CL). In this case, since the continuous double-faced corrugated cardboard sheet E is cut at a position (860 mm) away from the cutting mark M by the second cutting length L / 2 + the extra length Lm, the cutting length at this time is , The length obtained by subtracting the margin length Lm (for example, 10 mm) from the second cut length L / 2 (840 mm).

  In addition, the sheet defect removing apparatus 50 of the present embodiment can support not only the above-described preprint cutting mode but also a normal cutting mode. Hereinafter, a method for removing a sheet defect according to the present embodiment will be described. FIG. 6 is a time chart showing the operation of the defect removing device when switching from the normal cutting mode to the preprint cutting mode, FIG. 7 is a time chart showing the operation of the defect removing device in the preprint cutting mode, and FIG. 6 is a time chart illustrating an operation of the defect removing device when switching from a preprint cutting mode to a normal cutting mode.

  The sheet defect removing method of the present embodiment is a method of forming a continuous double-faced corrugated cardboard sheet E formed by laminating liners A and C on both sides of a corrugated core B to a predetermined length along a width direction. Cutting to a length L, detecting a defective portion Pf of the double-faced corrugated cardboard sheets E and F, and including the defective portion Pf when the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the allowable discharge length Ld. A step of cutting the continuous double-faced corrugated cardboard sheet E to a length shorter than the discharge allowable length Ld, and a step of discharging the plate-shaped double-faced corrugated cardboard sheet F0 cut to a length shorter than the discharge allowable length Ld from the transport line. Having.

  The control device 55 has a normal cutting mode for operating the cutoff 25 based on the first cutting length and a preprint cutting mode for operating the cutoff 25 based on the cutting mark M, and is switchable. I have. Here, the normal cutting mode is a mode in which a plate-like double-faced corrugated cardboard sheet F is manufactured using a normal liner having no surface pattern, characters, or cutting marks M printed thereon as the front liner A. In the normal cutting mode, the control device 55 inputs the first cutting length of the plate-shaped double-faced corrugated cardboard sheet F, and cuts from the transport speed of the continuous double-faced corrugated cardboard sheet E based on the first cutting length. Calculate the position.

  As shown in FIGS. 2 and 6, when switching from the normal cutting mode to the preprint cutting mode, the front liner A is spliced from the plain normal liner to the printed preprint liner. The portion becomes a defective portion Pf, and a plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion Pf is generated. In the following description, it is assumed that the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the allowable discharge length Ld.

  When the cutting mode is the normal cutting mode, since the preprint cutting mode signal is OFF and the first cutting length L1 of the plate-shaped double-faced corrugated cardboard sheet F, the cutoff 25 is activated for each first cutting length L1. I do. At this time, a cut completion signal is output from the cutoff 25 to the cutoff control device 56 at the timing when the double-faced corrugated cardboard sheet E having the continuous cutoff 25 is cut. The control device 55 knows when the defective portion (paper spliced portion) Pf reaches the cutoff 25, and one cycle before the timing when the defective portion Pf reaches the cutoff 25, and has a predetermined length. The cutting length is switched from the first cutting length L1 to the second cutting length LW (L1 / 2) over the range La. Note that one cycle is a length at which the cutoff 25 cuts one plate-shaped double-faced corrugated cardboard sheet F with the first cutting length L1.

  Then, after cutting the continuous double-faced corrugated cardboard sheet E by the first cutting length L1, the cutoff 25 is switched from the first cutting length L1 to the second cutting length LW, and the continuous double-faced corrugated cardboard sheet E having the defective portion Pf is cut. At a second cutting length LW over a predetermined length range La. That is, the cutoff 25 cuts the continuous double-faced corrugated cardboard sheet E at the first cutting length L1, then cuts the double-faced corrugated cardboard sheet E to the second cut length LW1 (L1 / 2 + Lm) and the second cut length LW2 (L1 / 2− Lm), the second cut length LW1 (L1 / 2 + Lm), and the second cut length LW2 (L1 / 2-Lm). Here, the cutting mode is switched to the preprint cutting mode, and the preprint cutting mode signal is turned on.

  In this preprint cutting mode, the cutoff 25 operates at the position of the cutting mark M to cut the continuous double-faced corrugated cardboard sheet E. However, the continuous double-faced corrugated cardboard sheet E does not have the cutting mark M from the position cut by the first cutting length L1 to the position of the second cutting length LW1. Therefore, the cutoff control device 56 operates the cutoff 25 at the position of the second cutting length LW1 obtained by adding the margin length Lm to the second cutting length LW, and cuts the continuous double-faced cardboard sheet E. Thereafter, the cutoff controller 56 operates the cutoff 25 at the position of the cutting mark M to cut the continuous double-faced corrugated cardboard sheet E. The cutting length at this time is the second cutting length LW2 obtained by subtracting the margin length Lm from the second cutting length LW. After switching the cutting length from the first cutting length L1 to the second cutting length LW, the control device 55 operates the defective product discharging device 26 to turn on the defective product discharging process.

  Thereafter, the continuous double-faced corrugated cardboard sheet E is conveyed, and the cutting length is switched from the second cutting length LW to the first cutting length L2 one cycle before reaching the predetermined length range La. Then, the cutoff control device 56 operates the cutoff 25 at the position of the cutting mark M to cut the continuous double-faced corrugated cardboard sheet E by the first cutting length L2. After switching the cutting length from the second cutting length LW to the first cutting length L2, the control device 55 stops the operation of the defective product discharging device 26 and turns off the defective product discharging process.

  As shown in FIGS. 2 and 7, in the preprint cutting mode, when the splicing signal is transmitted from the splicing portion detection device 51, the pass / fail judgment signal is transmitted from the one-stage defect detection device 52 or the quality inspection device 53. At the time, when a defective portion detection signal is transmitted from the defective detection switch 54, a plate-shaped double-faced cardboard sheet F0 including the defective portion Pf is generated.

  When the cutting mode is the preprint cutting mode, the preprint cutting mode signal is ON, the first cutting length L2 of the plate-shaped double-faced corrugated cardboard sheet F is set, and the cutoff 25 operates at the position of the cutting mark M. To cut the continuous double-faced cardboard sheet E. At this time, a cut completion signal is output from the cutoff control device 56 to the control device 55 at the timing when the double-faced corrugated cardboard sheet E having the continuous cutoff 25 is cut. The controller 55 knows when the defective portion Pf reaches the cutoff 25, and cuts over a predetermined length range Lb one cycle before the timing when the defective portion Pf reaches the cutoff 25. The length is switched from the first cut length L2 to the second cut length LW (L2 / 2).

  Then, after cutting the continuous double-faced corrugated cardboard sheet E at the position of the cutting mark M (first cutting length L2), the cutoff 25 is switched from the second cutting length L2 to the second cutting length LW, and the defective portion Pf Is cut at a second cutting length LW over a predetermined length range Lb. That is, the cut-off 25 cuts the continuous double-faced corrugated cardboard sheet E at the first cut length L2, and then cuts the double-faced corrugated cardboard sheet E with the second cut length LW1 (L1 / 2 + Lm) and the second cut length LW2 (L1 / 2- Lm), the second cut length LW1 (L1 / 2 + Lm), and the second cut length LW2 (L1 / 2-Lm).

  However, the continuous double-faced corrugated cardboard sheet E does not have the cutting mark M at the position of the second cutting length LW from the position cut by the first cutting length L2. Therefore, the cutoff control device 56 operates the cutoff 25 at the position of the second cutting length LW1 obtained by adding the margin length Lm to the second cutting length LW, and cuts the continuous double-faced cardboard sheet E. Thereafter, the cutoff controller 56 operates the cutoff 25 at the position of the cutting mark M to cut the continuous double-faced corrugated cardboard sheet E. The cutting length at this time is the second cutting length LW2 obtained by subtracting the margin length Lm from the second cutting length LW. Similarly, the cut-off control device 56 determines the position of the second cut length LW1 obtained by adding the margin Lm to the second cut length LW, and the margin Lm from the second cut length LW for the continuous double-faced corrugated cardboard sheet E. The cut-off 25 is operated at the position of the second cutting length LW2 from which is subtracted, and the continuous double-faced corrugated cardboard sheet E is cut. After switching the cutting length from the first cutting length L2 to the second cutting length LW1, the control device 55 operates the defective product discharging device 26 to turn on the defective product discharging process.

  Thereafter, the continuous double-faced corrugated cardboard sheet E is conveyed, and the cutting length is switched from the second cutting length LW to the first cutting length L2 one cycle before reaching the predetermined length range Lb. Then, the cutoff control device 56 operates the cutoff 25 at the position of the cutting mark M to cut the continuous double-faced corrugated cardboard sheet E by the first cutting length L2. After switching the cutting length from the second cutting length LW to the first cutting length L2, the control device 55 stops the operation of the defective product discharging device 26 and turns off the defective product discharging process. In this case, the control device 55 switches the cutting to the normal cutting after cutting the defective portion, and the length (LW × n × m: m is the length of the defective portion Pf) of n times the second cutting length. The cutoff 25 operates again at the position of the cutting mark M by performing cutting (an integer obtained by rounding up a quotient obtained by dividing the range Lb by the first cutting length L).

  Further, as shown in FIGS. 2 and 8, when switching from the preprint cutting mode to the normal cutting mode, the front liner A is spliced from the printed preprint liner to the plain normal liner. The spliced portion becomes a defective portion Pf, and a plate-shaped double-faced corrugated cardboard sheet F0 including the defective portion Pf is generated.

  When the cutting mode is the preprint cutting mode, the preprint cutting mode signal is ON, the first cutting length L2 of the plate-shaped double-faced corrugated cardboard sheet F is set, and the cutoff 25 operates at the position of the cutting mark M. To cut the continuous double-faced cardboard sheet E. At this time, a cut completion signal is output from the cutoff control device 56 to the control device 55 at the timing when the double-faced corrugated cardboard sheet E having the continuous cutoff 25 is cut. The controller 55 knows the time when the defective portion Pf reaches the cutoff 25, and cuts over a predetermined length range Lc one cycle before the time when the defective portion Pf reaches the cutoff 25. The length is switched from the first cutting length L2 to the second cutting length LW (L2 / 2), the cutting mode is switched to the normal cutting mode, and the preprint cutting mode signal is turned off.

  Then, after cutting the continuous double-faced corrugated cardboard sheet E at the position of the cutting mark M (first cutting length L2), the cutoff 25 is switched from the first cutting length L2 to the second cutting length LW, and the defective portion Pf Is cut at a second cutting length LW over a predetermined length range Lc. That is, the cut-off 25 cuts the continuous double-faced corrugated cardboard sheet E at the first cut length L2, and then cuts the double-faced corrugated cardboard sheet E with the second cut length LW (L2 / 2) and the second cut length LW (L2 / 2). Disconnect with Here, since the cutting mode is the normal cutting mode, the cutoff control device 56 activates the cutoff 25 when the first cutting length L2 is switched to the second cutting length LW, and the continuous double-faced corrugated cardboard sheet is cut. E is cut twice with the second cutting length LW. After switching the cutting length from the first cutting length L2 to the second cutting length LW, the control device 55 operates the defective product discharging device 26 to turn on the defective product discharging process.

  Thereafter, the continuous double-faced corrugated cardboard sheet E is conveyed, and the cutting length is switched from the second cutting length LW to the first cutting length L3 one cycle before reaching the predetermined length range Lc. Then, the cutoff control device 56 operates the cutoff 25 for each first cutting length L3 to cut the continuous double-faced corrugated cardboard sheet E at the first cutting length L3. After switching the cutting length from the second cutting length LW to the first cutting length L3, the controller 55 stops the operation of the defective product discharging device 26 and turns off the defective product discharging process.

  As described above, in the sheet defect removing apparatus of the present embodiment, the cutoff (cutting device) 25 that cuts the continuous double-faced corrugated cardboard sheet E along the width direction, and the defective portion Pf of the double-faced corrugated cardboard sheets E and F Part detecting device 51, a single-stage defect detecting device 52, a quality inspection device 53, a defect detecting switch 54, and a plate-shaped double-faced corrugated cardboard sheet F including a defective portion Pf are discharged from the transport line. The defective discharge device 26 and the defective discharge device 26 are operated in accordance with the detection result of the defect detection device, and the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the allowable discharge length Ld of the defective discharge device 26. A control device 55 and a cutoff control device for controlling the cutoff 25 so that the double-faced corrugated cardboard sheet F including the defective portion Pf is sometimes cut to a length shorter than the allowable discharge length Ld. And a 56.

  Accordingly, the control device 55 activates the cutoff 25 when the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the allowable discharge length Ld of the defective product discharge device 26, and the double-faced corrugated cardboard sheet E including the defective portion Pf. Is cut to a length shorter than the allowable discharge length Ld. Then, the double-faced corrugated cardboard sheet F0 including the defective portion Pf becomes shorter than the discharge allowable length Ld, and the double-faced corrugated cardboard sheet F0 including the defective portion Pf can be properly discharged from the transport line by the defective product discharging device 26. As a result, regardless of the length of the double-faced corrugated paperboard sheet F, the defective double-faced corrugated paperboard sheet F0 can be properly removed from the transport line to improve the working efficiency.

  In the sheet defect removing device of the present embodiment, when the length of the plate-shaped double-faced corrugated cardboard sheet F is longer than the allowable discharge length Ld, the control device 55 moves the double-faced corrugated cardboard sheet F including the defective portion Pf to a predetermined length L. The cut-off 25 is operated so as to cut to a length shorter than the allowable discharge length Ld over the above length ranges La, Lb, Lc. Therefore, the double-faced corrugated cardboard sheet F including the defective portion Pf is cut into a short length over the length range La, Lb, Lc that is equal to or longer than the predetermined length L. Can be discharged from

  In the sheet defect removing apparatus of the present embodiment, the cut-off 25 cuts the continuous double-faced corrugated cardboard sheet E to a predetermined first cutting length L set in advance in the width direction to form a plate-shaped double-faced corrugated cardboard sheet. When the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the discharge allowable length Ld, the controller 55 sets the cut length of the double-faced corrugated cardboard sheet F including the defective portion Pf to the first cut. The length is changed to the second cut length L / n, which is an integer fraction of the length L. Therefore, the cut-off 25 cuts the continuous double-faced cardboard sheet E to the first cutting length L to form a plate-like double-faced cardboard sheet F, and the continuous double-faced cardboard sheet E has a defective portion Pf, and When the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the discharge allowable length Ld, the cutting length is changed to the second cutting length L / n shorter than the first cutting length L. Therefore, the double-faced corrugated cardboard sheet F0 including the defective portion Pf is cut shorter than the discharge allowable length Ld, and can be easily discharged by the defective product discharge device 26.

  In the sheet defect removing device of the present embodiment, the control device 55 cuts the double-faced corrugated cardboard sheet E including the defective portion Pf by the second cutting length L / n by an integer, and then cuts the second cutting length L / n from the second cutting length L / n. Change to one cutting length L. Therefore, after the double-faced corrugated cardboard sheet E including the defective portion Pf is cut shorter than the discharge allowable length Ld and discharged, the second cut length L / n is returned to the first cut length L. Therefore, the cut-off 25 can cut the continuous double-faced corrugated cardboard sheet E to a predetermined first cutting length L to continuously form the plate-shaped double-faced corrugated cardboard sheet F.

  In the sheet defect removing apparatus of the present embodiment, the controller 55 changes the first cutting length L to the second cutting length L / n, and then, when there is no defective portion Pf in the double-faced corrugated cardboard sheet F, performs the second cutting. The length L / n is changed to the first cutting length L. Therefore, after the double-faced corrugated paperboard sheet F0 including the defective portion Pf is cut short and discharged, when the double-faced corrugated paperboard sheet F has no defective portion Pf, the double cut length L / n is returned to the first cut length L. Therefore, the cut-off 25 can cut the continuous double-faced corrugated cardboard sheet E to a predetermined first cutting length L to continuously form the plate-shaped double-faced corrugated cardboard sheet F.

  In the sheet defect removing apparatus of the present embodiment, the front liner A is a preprint liner on which a cutting mark M indicating a cutting position is printed on the surface, and detects the cutting mark M upstream of the cutoff 25. A mark detecting device 75 is provided, and when the cutting mark M is not present at the position of the second cutting length L / n, the control device 55 determines a position obtained by adding a preset margin length Lm to the second cutting length L / n. The cut-off 25 is activated. Therefore, the control device 55 changes the first cut length L to the second cut length L / n when the double-faced corrugated cardboard sheet F is at the defective portion Pf and the length L is longer than the discharge allowable length Ld. Since there is no cutting mark M at the position of the second cutting length L / n, the double-faced corrugated cardboard sheet F including the defective portion Pf is cut at a position obtained by adding the margin length Lm to the second cutting length L / n. Therefore, the double-faced corrugated cardboard sheet F0 including the defective portion Pf is cut shorter than the discharge allowable length Ld, and can be easily discharged by the defective product discharge device 26.

  In the sheet defect removing apparatus of the present embodiment, the control device 55 controls the operation of the cutoff 25 based on the first cutting length L in the normal cutting mode and the operation of the cutoff 25 based on the cutting mark M. It has a preprint cutting mode to be controlled, and changes from the first cutting length L to the second cutting length L / n when switching between the normal cutting mode and the preprint cutting mode. Therefore, the control device 55 changes the first cutting length L to the second cutting length L / n when switching from the normal cutting mode to the preprint cutting mode or when switching from the preprint cutting mode to the normal cutting mode. Therefore, the double-faced corrugated cardboard sheet F0 including the paper spliced portion generated at the time of mode switching can be cut short, and can be properly discharged by the defective product discharging device 26.

  In the sheet defect removing apparatus of the present embodiment, the defective portion Pf is at least one of a paper spliced portion, a core deformed portion, a defective printing portion, a scratch, and a stain. Therefore, the double-faced corrugated cardboard sheet F including the defective portion Pf such as the paper spliced portion, the core deformed portion, or the defective printing portion can be cut appropriately and discharged.

  Further, in the method of removing defective cardboard sheets according to the present embodiment, a double-faced cardboard sheet E formed by laminating liners A and C on both sides of a corrugated core B is preset along the width direction. Cutting the defective portion Pf to a predetermined length L, detecting a defective portion Pf of the double-faced corrugated cardboard sheet, and removing the defective portion Pf when the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the discharge allowable length Ld. And a step of discharging the plate-shaped double-faced corrugated cardboard sheet F0 cut to a length shorter than the discharge allowable length Ld from the transport line. .

  Accordingly, the control device 55 activates the cutoff 25 when the length L of the plate-shaped double-faced corrugated cardboard sheet F is longer than the allowable discharge length Ld of the defective product discharge device 26, and the double-faced corrugated cardboard sheet E including the defective portion Pf. Is cut to a length shorter than the allowable discharge length Ld. Then, the double-faced corrugated cardboard sheet E including the defective portion Pf becomes shorter than the discharge allowable length Ld, and a person capable of properly discharging the double-faced corrugated cardboard sheet F including the defective portion Pf from the transport line by the defective product discharging device 26 can be obtained. As a result, regardless of the length of the double-faced corrugated paperboard sheet F, the defective double-faced corrugated paperboard sheet F0 can be properly removed from the transport line to improve the working efficiency.

  In addition, in the corrugated cardboard sheet manufacturing apparatus of the present embodiment, the single facers 13 and 17 for manufacturing the single-sided corrugated cardboard sheet D by bonding the back liner C to the corrugated core B and the single facer 13 , 17 are provided with a double facer 22 for bonding the front liner A to the core B side of the single-faced cardboard sheet D to produce a double-faced cardboard sheet E, and a sheet defect removing device 50.

  Accordingly, the single facers 13 and 17 produce the single-faced corrugated cardboard sheet D by laminating the back liner C to the corrugated core B, and the double facer 22 constitutes the single-faced corrugated cardboard sheet produced by the single facers 13 and 17. The front liner A is attached to the core B side of D to produce a double-faced cardboard sheet E, and the cutoff 25 cuts the double-faced cardboard sheet E into a predetermined length along the width direction. At this time, the control device 55 discharges the double-faced corrugated cardboard sheet F including the defective portion Pf from the transport line by the defective product discharge device 26. When the length is longer than the permissible length Ld, the cutoff 25 is operated to cut the double-faced corrugated cardboard sheet E including the defective portion Pf into a length shorter than the permissible discharge length Ld. Then, the double-faced corrugated cardboard sheet F0 including the defective portion Pf becomes shorter than the discharge allowable length Ld, and the double-faced corrugated cardboard sheet F0 including the defective portion Pf can be properly discharged from the transport line by the defective product discharging device 26. As a result, regardless of the length of the double-faced corrugated paperboard sheet F, the defective double-faced corrugated paperboard sheet F0 can be properly removed from the transport line to improve the working efficiency.

  In the above-described embodiment, the defective product discharge device 26 includes the first transport conveyor 64, the second transport conveyor 65, the first discharge conveyor 66, the second discharge conveyor 67, and the distribution roll 68. However, the present invention is not limited to this configuration. For example, a defective storage basket or the like may be provided instead of the second discharge conveyor 67.

  Further, in the above-described embodiment, the cutting device is the cutoff 25, but is not limited to this configuration. For example, a cutting device may be provided separately from the cutoff 25.

  In the above-described embodiment, the corrugating machine 10 manufactures the double-sided corrugated cardboard sheet by laminating the single-sided corrugated cardboard sheet D1, the single-sided corrugated cardboard sheet D2, and the front liner A. However, the single-sided corrugated cardboard sheet D2 (D1) A double-sided corrugated cardboard sheet may be manufactured by laminating the sheet liner A with the front liner A.

  In the above-described embodiment, the control device of the present invention is configured by the control device 55 and the cutoff control device 56. However, a single control device may be provided by sharing functions.

10 Corrugating machine (corrugated sheet manufacturing equipment)
11, 12, 15, 16, 19 Mill roll stand 13, 17 Single facer 14, 18 Bridge 20 Preheater 21 Glue machine 22 Double facer 23 Rotary shear 24 Slitter corer 25 Cut-off (cutting device)
26 defective product discharge device 27 stacker 28 splicer 50 sheet defect removing device 51 (51a, 51b, 51c, 51d) paper splicing portion detecting device (defective detecting device)
52 (52a, 52b) Single-stage failure detection device (failure detection device)
53 (53a, 53b) Quality inspection device (defective detection device)
54 (54a, 54b) failure detection switch (failure detection device)
55 control device 61 transport conveyor 62, 63 cutting roll 64 first transport conveyor 65 second transport conveyor 66 first discharge conveyor 67 second discharge conveyor 68 distribution roll 75 mark detection device 77 mark sensor A front liner (first liner)
B1, B2 Core C1, C2 Back liner (second liner)
D1, D2 Single-sided cardboard sheet E, E1 Continuous double-sided cardboard sheet E, E2 Continuous double-sided cardboard sheet F, F1 Plate-shaped double-sided cardboard sheet F, F2 Plate-shaped double-sided corrugated cardboard sheet F0 Double-sided corrugated cardboard L First cut length L / n (L / 2) Second cut length Lm Margin length Ld Allowable discharge length Pf Defective part

Claims (10)

In a sheet defect removing device for removing a defective corrugated cardboard sheet having a predetermined length formed by laminating a first liner, a corrugated core, and a second liner,
A cutting device for cutting the cardboard sheet along the width direction,
A defect detection device for detecting a defective portion of the cardboard sheet;
A defective product discharging device that discharges a plate-like corrugated cardboard sheet including the defective portion from a transport line,
Activating the defective product discharging device according to the detection result of the defective detection device and, when the length of the plate-shaped corrugated cardboard sheet is longer than the allowable discharge length of the defective product discharging device, removing the corrugated cardboard sheet including the defective portion. A control device for controlling the cutting device so as to cut to a length shorter than the discharge allowable length,
An apparatus for removing defective sheets, comprising:   When the length of the plate-shaped corrugated cardboard sheet is longer than the discharge allowable length, the control device cuts the corrugated cardboard sheet including the defective portion into a length shorter than the discharge allowable length over a length range equal to or longer than the predetermined length. The sheet defect removing apparatus according to claim 1, wherein the cutting apparatus is controlled to perform the cutting operation.   The cutting device forms a plate-shaped corrugated cardboard sheet by cutting a continuous corrugated cardboard sheet to a predetermined first cutting length set in advance in the width direction, and the control device includes a plate-shaped corrugated cardboard sheet. When the length of the corrugated cardboard sheet is longer than the discharge allowable length, the cut length of the corrugated cardboard sheet including the defective portion is changed to a second cut length that is an integer fraction of the first cut length. The sheet removing apparatus according to claim 1 or 2.   The method according to claim 3, wherein the control device changes the second cut length to the first cut length after cutting the corrugated cardboard sheet including the defective portion by the second cut length by the integer. The sheet removing device described in the above.   After changing the first cut length to the second cut length, the control device changes the second cut length to the first cut length when the cardboard sheet does not have the defective portion. The sheet defect removing device according to claim 3.   The first liner is provided with a cutting mark indicating a cutting position on a surface thereof, and a mark detecting device that detects the cutting mark is provided upstream of the cutting device in the conveying direction of the corrugated cardboard sheet. The control device includes: The method according to claim 3, wherein when the cutting mark is not present at the position of the second cutting length, the operation of the cutting device is controlled at a position obtained by adding a preset margin length to the second cutting length. The sheet defect removing device according to claim 5.   The control device has a normal cutting mode that controls the operation of the cutting device based on a first cutting length, and a preprint cutting mode that operates to control the operation of the cutting device based on the cutting mark. The apparatus according to claim 6, wherein the first cutting length is changed to the second cutting length when switching between the normal cutting mode and the preprint cutting mode.   8. The method according to claim 1, wherein the defective portion is at least one of a paper spliced portion, a core deformed portion, a defective print portion, a flaw, a stain, and an adhesive residue. 9. 3. The sheet defect removing device according to claim 1. A step of cutting a corrugated cardboard sheet formed by laminating a liner on both sides of the corrugated core to a predetermined length set in advance in the width direction,
A step of detecting a defective portion of the cardboard sheet;
A step of cutting the cardboard sheet including the defective portion into a length shorter than the discharge allowable length when the length of the plate-like corrugated cardboard sheet is longer than the discharge allowable length,
Discharging a plate-shaped corrugated cardboard sheet cut to a length shorter than the discharge allowable length from a transport line,
A method for removing a defective sheet, comprising: A single facer for manufacturing a single-sided cardboard sheet by laminating a second liner to the corrugated core;
A double facer for manufacturing a corrugated cardboard sheet by laminating a first liner to a center side of the single-sided corrugated cardboard sheet;
A sheet defect removing device according to any one of claims 1 to 8,
An apparatus for manufacturing a corrugated cardboard sheet, comprising:

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