JP2019130731A - Defect detection device of corrugated cardboard sheet, defect removal device of corrugated cardboard sheet and manufacturing device of corrugated cardboard sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distinguish a corrugated cardboard sheet having a defect due to deformation of a corrugated mountain and a corrugated cardboard sheet having a paper joint in a corrugated cardboard sheet defect detecting device, a corrugated cardboard sheet defect removing device and a corrugated cardboard sheet manufacturing apparatus. , It is possible to easily verify a defective corrugated cardboard sheet. SOLUTION: A paper splicing portion detecting device 57 for detecting a paper splicing portion of a back liner C and a paper splicing portion of a core B, a core defect detecting device 59 for detecting a shape defect of the core B, and a paper splicing portion. Judgment to distinguish between the shape defect of the core B in the paper splicing portion and the shape defect of the core B in the region excluding the paper splicing portion based on the detection result of the detection device 57 and the detection result of the core defect detection device 59. A device 60 is provided. [Selection diagram] Fig. 3

Description

  The present invention relates to a cardboard sheet defect detection device for detecting a defect in a corrugated cardboard sheet produced by laminating a front liner, a corrugated core and a back liner, and a cardboard sheet defect including the cardboard sheet defect detection device. The present invention relates to a removing device and a corrugated sheet manufacturing apparatus including the corrugated sheet defect removing device.

  A corrugating machine as a corrugated cardboard manufacturing apparatus includes a single facer that forms a single-sided cardboard sheet and a double facer that forms a double-sided cardboard sheet by bonding a front liner paper to the single-sided cardboard sheet. A single facer forms a single-sided cardboard sheet by processing the core (core) into a corrugated shape, and a back liner is laminated, and a double facer forms a double-sided cardboard sheet by sticking a front liner to the single-sided cardboard sheet. . The continuous double-sided corrugated cardboard sheet produced by the double facer is cut into a predetermined width by a slitter scorer and cut into a predetermined length by a cut-off device to form a corrugated cardboard sheet.

  In this corrugating machine, when the corrugated core is bonded to the back liner to form a single-sided corrugated cardboard sheet, the corrugated crest of the core may be deformed, and when the core is deformed, the front liner is attached to the single-sided corrugated cardboard sheet. Adhesion failure may occur during bonding, or the double-sided corrugated cardboard sheet thickness may become non-uniform, causing a defective corrugated cardboard sheet to be generated. Therefore, as a defect detection device for a corrugated cardboard sheet that detects deformation of a core in a single-sided corrugated cardboard sheet, for example, there is one described in Patent Document 1 below. The defect detection apparatus for a corrugated cardboard sheet described in Patent Document 1 irradiates light toward the center of a single-sided cardboard sheet to pick up an image of the irradiated part, and the length of the bright part and the dark part of the core in the photographed image. The quality is determined based on the quality, and the cardboard sheet determined to be defective is removed from the production line.

Japanese Unexamined Patent Publication No. 2017-133998

  By the way, the above-mentioned front liner, center core, and back liner are sheets supplied from roll paper held on a mill roll stand, and when the remaining roll paper is reduced, a new roll paper is spliced to continuously. The sheet can be fed out. However, since the sheet splice part of this sheet is a thickened part of two sheets, the sheet splice part is detected and cut during the production of the cardboard sheet, and the cardboard sheet is removed from the production line. doing. In this case, since the paper splice part is a thick sheet portion, the corrugated peak of the core is deformed during corrugation processing of the core, or adhesion failure occurs when the core and the back liner are bonded. Sometimes. Therefore, the conventional defect detection apparatus for corrugated cardboard sheets detects not only the corrugated cardboard sheet whose core is deformed but also the corrugated cardboard sheet with the spliced part as a defect and removes it from the production line.

  When forming a corrugated peak by processing the corrugated core, the cause of the deformation of the corrugated peak may be insufficient heating of the sheet or insufficient pressurization of the sheet. It is necessary to adjust the amount of pressurization. For this reason, when a corrugated sheet failure occurs due to the deformation of the corrugated mountain, it is necessary to identify the cause of the deformation of the corrugated sheet by looking at the defective portion of the corrugated sheet. However, conventional cardboard sheet defect detection devices detect not only a corrugated cardboard sheet with a deformed core but also a corrugated cardboard sheet with a splicing part as defective and remove it from the production line. . Then, it becomes difficult to find a defective corrugated cardboard sheet in which the corrugated peak is deformed, and it takes a long time to identify the cause of the deformed peak. Further, the defect detection device for corrugated cardboard records images of defective portions detected by the corrugated cardboard sheet, and it is difficult to find an image of a defective corrugated cardboard sheet in which a waveform peak is deformed from a large number of recorded images. It becomes.

  The present invention solves the above-mentioned problems, and makes it easy to verify a defective cardboard sheet by distinguishing a corrugated cardboard sheet that has become defective due to the deformation of the corrugated crest and a corrugated cardboard sheet with a paper joint. An object of the present invention is to provide a cardboard sheet defect detection apparatus, a cardboard sheet defect removal apparatus, and a corrugated sheet manufacturing apparatus that can be performed.

  In order to achieve the above object, a cardboard sheet defect detection apparatus according to the present invention is a cardboard sheet defect detection apparatus for detecting defects in a corrugated cardboard sheet having a corrugated core attached to a liner. A paper splicing part detecting device for detecting a paper splicing part and a splicing part of the core, a core fault detecting device for detecting a defective shape of the core, a detection result of the paper splicing part detecting device, and the core A determination device that distinguishes between a defective shape of the core at the spliced portion and a defective shape of the core at a region excluding the spliced portion based on a detection result of the defect detecting device. It is what.

  Therefore, based on the detection result of the liner paper splice and the core splice, and the detection result of the defective shape of the core, the middle splice at the paper splice and the region other than the paper splice are excluded. The core shape is distinguished from the defect, and the corrugated cardboard sheet that has become defective due to the deformation of the corrugated mountain can be easily verified.

  In the defect detection apparatus for corrugated cardboard sheets according to the present invention, the determination apparatus determines that a shape defect of the core in a region excluding the paper splicing portion is a defect of the corrugated cardboard sheet.

  Accordingly, since it is determined that only the shape defect of the core in the region excluding the paper splicing portion is a defect in the corrugated cardboard sheet, the defective corrugated cardboard sheet can be easily verified.

  In the defect detection device for corrugated cardboard sheets according to the present invention, the determination device stops detecting the shape defect of the core with respect to the paper splicing portion by the center defect detection device.

  Accordingly, since detection of the shape defect of the core with respect to the paper splicing portion is stopped, it is possible to detect only the shape defect at the time of processing or bonding of the core.

  In the cardboard sheet defect detection device according to the present invention, the imaging device that images the core attached to the liner, and the determination device determines that the shape of the core is defective in an area excluding the paper splicing portion. A display device capable of displaying only a center image is provided.

  Therefore, only the image of the defective shape of the core in the region excluding the paper splicing portion is displayed on the display device, and the defective corrugated cardboard sheet can be easily verified.

  In the cardboard sheet defect detection device of the present invention, the display device distinguishes between the image of the core defect at the paper splicing portion and the image of the core defect at an area excluding the paper splicing portion. It can be displayed.

  Therefore, it is possible to display only the image of the defective shape of the core in the region excluding the paper splicing portion by switching the display device, and the corrugated cardboard sheet that is defective can be easily verified.

  In the corrugated cardboard sheet defect detection device according to the present invention, the determination device is provided with a storage device that stores the image of the core that is determined to have a defective shape of the core in an area excluding the splicing portion. Yes.

  Accordingly, only the image of the defective shape of the core in the region excluding the paper splicing portion is stored in the storage device, and only the necessary image can be stored in the storage device, and an increase in storage capacity can be suppressed. The corrugated cardboard sheet that is defective at any time can be easily verified.

  In the cardboard sheet defect detection device according to the present invention, the determination device is provided with a notification device that notifies the occurrence of a defect only when it is determined that the shape of the center core is defective in an area excluding the paper splicing portion. Yes.

  Therefore, since the notification device notifies only when the shape defect of the core occurs in the area excluding the paper splicing portion, the operator's complexity can be eliminated.

  The defect removal device for corrugated cardboard of the present invention is a discharge device for discharging a corrugated sheet defect detection device and a double-sided cardboard sheet cut into a predetermined length including a defect portion detected by the defect detection device for the cardboard sheet. And a device.

  Therefore, the defect detection device for corrugated cardboard sheets detects the core misalignment and paper splice at the paper splicing section based on the detection results of the liner splicing section and the core splicing section of the liner, and the detection result of the core misalignment. In order to distinguish the shape defect of the core in the region excluding the portion, it is possible to easily verify the corrugated cardboard sheet that has become defective due to the deformation of the corrugated crest.

  In the defect removal apparatus for corrugated cardboard sheets according to the present invention, the discharge device includes the double-sided corrugated sheet including the defective portion of the core in the paper splicing portion and the defective portion of the core in the region excluding the splicing portion. It is characterized by being discharged separately from the double-sided corrugated cardboard sheet.

  Therefore, since the double-sided corrugated sheet including the defective portion of the core in the region excluding the paper joint is distinguished from the double-sided corrugated sheet including the defective portion of the core at the paper joint, the corrugated peak The cause of the defect can be verified by directly viewing the corrugated cardboard sheet that has become defective due to the deformation.

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

  Accordingly, the single facer manufactures a single-sided cardboard sheet by laminating the second liner to the corrugated core, and the double facer has the first liner on the center side of the single-sided cardboard sheet manufactured by the single facer. A double-sided cardboard sheet is manufactured by laminating. At this time, based on the detection results of the liner paper splicing portion and the core splicing portion, and the detection result of the defective shape of the central core, in the region excluding the core flaw shape and the paper splicing portion in the paper splicing portion. It is possible to distinguish from the shape defect of the core, and it is possible to easily verify the corrugated cardboard sheet that has become defective due to the deformation of the corrugated peak.

  According to the defect detection device for a corrugated cardboard sheet, the defect removal device for corrugated cardboard sheet, and the corrugated sheet manufacturing apparatus, the corrugated cardboard sheet which has become defective due to the deformation of the corrugated crest and the corrugated cardboard sheet having a paper splice portion are distinguished. As a result, the defective corrugated cardboard sheet can be easily verified.

FIG. 1 is a schematic view showing a corrugating machine as a corrugated board manufacturing apparatus of the present embodiment. FIG. 2 is a schematic view of the main part of a single facer equipped with the cardboard sheet defect detection device of the present embodiment. FIG. 3 is a schematic configuration diagram illustrating a defect detection device for a corrugated cardboard sheet according to the present embodiment. FIG. 4 is a side view showing an arrangement configuration of an irradiation device and an imaging device for a single-sided cardboard sheet. FIG. 5 is a schematic diagram for explaining the irradiation angle of the irradiation device with respect to the center of the single-sided cardboard sheet. FIG. 6 is a schematic diagram showing a splicer. FIG. 7 is a flowchart for explaining a defect detection method for a corrugated cardboard sheet. FIG. 8 is a time chart for explaining the output of the defect detection stop signal to the paper splicing portion. FIG. 9 is a flowchart for explaining a first modification of the cardboard sheet defect detection method. FIG. 10 is a flowchart for explaining a second modification of the defect detection method for cardboard sheets. FIG. 11 is a schematic diagram showing a display screen by the display device.

  Exemplary embodiments of a defect detection apparatus for cardboard sheets, a defect removal apparatus for cardboard sheets, and a production apparatus for cardboard sheets according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 1 is a schematic view showing a corrugating machine as a corrugated board manufacturing apparatus of the present embodiment.

  In the present embodiment, as shown in FIG. 1, a corrugating machine 10 as a corrugated sheet manufacturing apparatus firstly attaches a back liner (second liner) C1 to a corrugated core B1 to provide a single-sided corrugated sheet D1. And a back liner (second liner) C2 is bonded to the corrugated core B2 to produce a single-sided 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 continuously bonded to the center B2 of the single-sided cardboard sheet D2. The manufactured double-sided cardboard sheet E is manufactured. Then, by cutting the continuous double-sided cardboard sheet E into a predetermined length, a plate-like double-sided cardboard sheet F is manufactured.

  The corrugating machine 10 includes a mill roll stand 11 with a center core B1, a mill roll stand 12 with a back liner C1, a single facer 13, a bridge 14, a mill roll stand 15 with a center core B2, and a mill with a back liner C2. Roll stand 16, single facer 17, bridge 18, front liner A mill roll stand 19, preheater 20, glue machine 21, double facer 22, rotary 23, slitter scorer 24, and cut-off 25, a defective product discharge device 26, and a 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 and wound in a roll shape, and a splicer that performs a splicing between the roll papers. Is provided. When one roll paper is being fed, the other roll paper is loaded and ready for splicing. When one roll paper is low, the splicer is spliced with the other roll paper. Is done. Therefore, the paper is continuously fed from the mill roll stands 11 and 15 toward the downstream side.

  Further, the mill roll stands 12 and 16 are each provided with roll papers in which the back liners C1 and C2 are wound in rolls on both sides, and a splicer is provided between each roll paper. When one roll paper is being fed, the other roll paper is loaded and ready for splicing. When one roll paper is low, the splicer is spliced with the other roll paper. Is done. Therefore, the paper is continuously fed from the mill roll stands 12 and 16 toward the downstream side.

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

  The single facer 13 forms a single-sided cardboard sheet D1 by processing the heated core B1 into a corrugated shape and then gluing the heated core B1 to each step top and bonding the heated back liner C1. The single facer 13 is provided with a take-up conveyor obliquely upward on the downstream side in the conveyance direction, and conveys the single-sided cardboard sheet D1 formed by the single facer 13 to the bridge 14. Since the bridge 14 absorbs the speed difference between the single facer 13 and the double facer 22, the single-sided cardboard sheet D1 can be temporarily retained.

  Further, the single facer 17 forms the one-sided cardboard sheet D2 by processing the heated core B2 into a corrugated shape and then gluing it to the tops of the steps and bonding the heated back liner C2. The single facer 17 is provided with a take-up conveyor obliquely upward on the downstream side in the conveyance direction, and conveys the single-sided cardboard sheet D2 formed by the single facer 17 to the bridge 18. Since the bridge 18 absorbs the speed difference between the single facer 17 and the double facer 22, the single-sided cardboard sheet D2 can be temporarily retained.

  The mill roll stand 19 is provided with roll paper on which the front liner A is wound in rolls on both sides, and a splicer is provided between each roll paper. When one roll paper is being fed, the other roll paper is loaded and ready for splicing. When one roll paper is low, the splicer is spliced with the other roll paper. Is done. Therefore, the paper is continuously fed from the mill roll stand 19 toward the downstream side.

  In the preheater 20, three preheating rolls 31, 32, and 33 are arranged in the vertical direction. The preheating roll 31 is for heating the front liner A, the preheating roll 32 is for heating the single-sided cardboard sheet D2, and the preheating roll 33 is for heating the single-sided cardboard sheet D1. Each preheating roll 31, 32, 33 has a winding amount adjusting device (not shown), is supplied with steam and heated to a predetermined temperature, and has a front liner A and a single-sided cardboard sheet on its peripheral surface. D2 can be preheated by winding the single-sided cardboard sheet D1.

  In the glue machine 21, the pasting rolls 34 and 35 are arranged side by side in the vertical direction. The gluing roll 34 is for gluing by contacting each top of the step of the core B2 in the single-sided cardboard sheet D2 heated by the preheating roll 32. The gluing roll 35 is for gluing in contact with each top of the step of the core B1 in the single-sided cardboard sheet D1 heated by the preheating roll 33. The single-sided cardboard sheets D1 and D2 glued by the glue machine 21 are transferred to the double facer 22 of the next process. Further, 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 a heating section 36 on the upstream side and a cooling section 37 on the downstream side along the traveling lines of the single-sided cardboard sheets D1 and 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 by the heating section 36, and are cooled together in an overlapping state. It is transported towards section 37. During this transfer, the single-sided cardboard sheets D1 and D2 and the front liner A are heated while being pressurized, so that they are bonded together to form a continuous double-sided cardboard sheet E, and then naturally cooled while being conveyed.

  The double-sided cardboard sheet E manufactured by the double facer 22 is transferred to the slitter scorer 24. The slitter scorer 24 cuts a wide double-sided corrugated cardboard sheet E 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 is composed of a first slitter scorer unit 38 and a second slitter scorer unit 39 having substantially the same structure arranged along the conveyance direction of the double-sided cardboard sheet E. The wide double-sided cardboard sheet E is cut by the slitter scorer 24 to form a double-sided cardboard sheet E having a predetermined width.

  The cut-off 25 is formed by cutting the double-sided cardboard sheet E cut in the transport direction by the slitter scorer 24 along the width direction into a plate-like double-sided cardboard sheet F having a predetermined length. The defective product discharge device 26 discharges the double-sided corrugated cardboard sheet F determined as a defective product by a defect detection device, which will be described later, from the conveyance line. The stacker 27 stacks the double-sided corrugated cardboard sheets F determined to be non-defective products and discharges them as products to the outside of the machine.

  Here, the defect detection apparatus for corrugated cardboard according to the present embodiment will be described. FIG. 2 is a schematic view of the main part of a single facer equipped with the cardboard sheet defect detection device of the present embodiment.

  In the present embodiment, as shown in FIG. 2, the cardboard sheet defect detection device 40 is provided between the bridge 18 and the preheater 20. The cardboard sheet defect detection device 40 includes a first defect detection device 40A that detects defects in the single-sided cardboard sheet D1 (B1, C1) and a second defect detection device that detects defects in the single-sided cardboard sheet D2 (B2, C2). 40B, which is substantially the same configuration. The single-sided cardboard sheet D1 conveyed from the bridge 14 side is guided by the guide rollers 41a, 42a, 43a to reach the first defect detection device 40A, and is guided by the guide rollers 44a, 45a, 46a, 47a to the preheater 20 side. Be transported. The single-sided cardboard sheet D2 conveyed from the bridge 18 side is guided by the guide rollers 41b, 42b, 43b to reach the second defect detection device 40B, and is guided by the guide rollers 44b, 45b, 46b to the preheater 20 side. Be transported.

  Support plates 49 and 50 are fixed to the frame 48, guide rollers 43a and 43b are rotatably supported on the support plate 49, and guide rollers 44a, 44b, 45a, 45b, 46a, 46b, and 47a are supported on the support plate 50. It is supported rotatably. Further, imaging devices 52 a and 52 b described later are supported by the support plate 49, and irradiation devices 51 a and 51 b described later are supported by the support plate 50. Hereinafter, the defect detection device 40 (40A, 40B) for cardboard sheets will be described in detail.

  FIG. 3 is a schematic configuration diagram illustrating a defect detection device for a corrugated cardboard sheet according to the present embodiment.

  As shown in FIG. 3, the cardboard sheet defect detection device 40 (40A, 40B) is a single-sided cardboard sheet D (conveyed by guide rollers 43, 44, 45, 46 with the corrugated core B facing outside. D1 and D2) are detected. In addition to the guide rollers 43, 44, 45, 46, the cardboard sheet defect detection device 40 includes an irradiation device 51 (51 a, 51 b), an imaging device 52 (52 a, 52 b), a control device 53, and a notification device 54. And a display device 55 and a storage device 56. The control device 53 includes a paper splice detection device 57, a shadow image processing device 58, a center defect detection device 59, and a determination device 60. Further, the cardboard sheet defect removing device 90 includes the cardboard sheet defect detecting device 40 and the defective product discharging device 26. Specifically, the defect removal device 90 for corrugated cardboard includes a defect position specifying device 61 and a tracking device 62 that constitute the control device 53.

  The cardboard sheet defect detection device 40 and the cardboard sheet defect removal device 90 will be described in detail below.

  The guide rollers 43, 44, 45, 46 can be driven or driven and can guide and convey the single-sided cardboard sheet D at the outer peripheral portion. The single-sided cardboard sheet D is formed by bonding the corrugated core B to the back liner C, and the guide roller 43 guides the single-sided cardboard sheet D with the corrugated core B facing outside. doing.

  The irradiation device 51 irradiates parallel light toward the core B at an irradiation angle inclined by a predetermined angle set in advance with respect to the perpendicular of the single-sided cardboard sheet D. The imaging device 52 images the irradiation part (shadow) of the parallel light in the core B. The shadow image processing device 58 defines a bright portion and a dark portion along the conveyance direction of the single-sided cardboard sheet D based on the captured image picked up by the image pickup device 52. The center defect detection device 59 detects a shape defect of the center B based on the length of the bright part and the length of the dark part defined by the shadow image processing device 58.

  The paper splicing part detection device 57 detects the paper splicing part of the back liner C and the paper splicing part of the core B. Based on the detection result of the paper splicing portion detection device 57 and the detection result of the core flaw detection device 59, the determination device 60 determines the shape of the core B at the paper splicing portion and the core B in the region excluding the paper splicing portion. The shape defect of the core B in the region excluding the paper splice is determined to be a defect of the single-sided cardboard sheet D.

  Further, the notification device 54 notifies the determination result of the determination device 60, the display device 55 displays the determination result of the determination device 60, and the storage device 56 is a core defect detection device. The determination value used by 59, the determination result of the determination device 60, and the like are stored.

  The defect position specifying device 61 is for specifying a defect position in the single-sided cardboard sheet D detected by the cardboard sheet defect detection device 40. The tracking device 62 tracks the defective position in the single-sided cardboard sheet D specified by the defective position specifying device 61. The control device 53 operates the defective product discharge device 26 based on the tracking result of the tracking device 62.

  FIG. 4 is a side view showing the arrangement of the irradiation device and the imaging device for the single-sided cardboard sheet, and FIG. 5 is a schematic diagram for explaining the irradiation angle of the irradiation device with respect to the center of the single-sided cardboard sheet.

  As shown in FIGS. 3 and 4, the irradiation device 51 is disposed at a position separated from the guide roller 45 by a predetermined distance, and is fixed to the device main body (support plate 50) by a mounting bracket 72. Further, the irradiation device 51 is disposed so as to face the peripheral surface of the guide roller 45 so as to correspond to the axial length of the guide roller 45, and by the outer peripheral surface of the guide roller 45, that is, the guide roller 45. Parallel light can be irradiated toward the region of the full width of the single-sided cardboard sheet D to be guided. This parallel light is light that travels straight in parallel with each other, particularly when the guide roller 45 is viewed from the axial direction, without radiating the optical axes radiated toward the guide roller 45. In addition, the irradiation apparatus 51 is comprised by one irradiation device or several irradiation devices.

  The imaging device 52 is disposed at a position separated from the guide roller 45 by a predetermined distance, and is fixed to the device main body (support plate 49) by a mounting bracket 72. Further, the imaging device 52 is disposed so as to face the intermediate position in the axial direction of the guide roller 45, and the outer peripheral surface of the guide roller 45, that is, the region of the entire width of the single-sided cardboard sheet D guided by the guide roller 45. An image can be taken. The imaging device 52 is one line camera or a plurality of line cameras, and images an irradiation part at a mountain in the core B having a waveform shape. In this case, the imaging device 52 can capture an image of one pixel along the conveyance direction of the single-sided cardboard sheet D and a plurality of pixels along the width direction of the single-sided cardboard sheet D. Therefore, in the imaging device 52, the imaging interval is set according to the conveyance speed of the single-sided cardboard sheet D or the pitch of the peaks of the core B.

  In the present embodiment, the imaging device (line camera) 52 is arranged on the perpendicular line of the single-sided cardboard sheet D, that is, on the line along the radial direction passing through the center of the guide roller 43. The sheet D is arranged on a line having an angle (irradiation angle) inclined by a predetermined angle with respect to a perpendicular line (a line along the radial direction passing through the center of the guide roller 43).

  As shown in FIG. 5, the single-sided cardboard sheet D has a corrugated core B attached to the back liner C, the back liner C contacts the guide roller 43, and the core B is exposed to the outside. Are transported. The single-sided corrugated cardboard sheet D is supported by the guide roller 45 and travels in an arc shape, but here it will be described as traveling linearly. A perpendicular line L1 of the single-sided cardboard sheet D is defined along the radial direction through the center of the guide roller 45 and the peak portion Ba of the peak of the center core B. The irradiation angle θ1 of the parallel light S by the irradiation device 51 is an angle with respect to the perpendicular line L1, and is set to an angle θ1 that is larger than the angle θ from the perpendicular line L1 to the inclined line L2 along the slope of the mountain of the core B. The peak of the core B is composed of a first curved portion Bb having a convex shape outward from the peak portion Ba to the skirt portion, and a second curved portion Bc having a concave shape on the outer side. It is a tangent to the position on the most skirt side in one curve portion Bb. Since the irradiation angle θ1 of the parallel light S by the irradiation device 51 is set to an angle θ1 that is larger than the angle θ from the perpendicular line L1 to the inclined line L2, a shadow of a mountain can be generated by the irradiation light.

  Then, as shown in FIG. 4, the irradiation device 51 irradiates parallel light toward the core B at a predetermined irradiation angle θ <b> 1, and the imaging device 52 images the irradiation part on the mountain in the core B. Therefore, a boundary line is clearly formed between the bright part W and the dark part G, and the length of the bright part W and the length of the dark part G can be defined with high accuracy.

  As shown in FIG. 3, the shadow image processing device 58 defines the bright portion W and the dark portion G from the shadow of each mountain of the center core B from the captured image of the imaging device 52. In this case, the imaging device (line camera) 52 causes the shadow of one peak in the corrugated core B to be one pixel along the conveyance direction of the single-sided cardboard sheet D and along the width direction of the single-sided cardboard sheet D. Are captured as a multi-pixel image. Therefore, the shaded image processing device 58 combines a plurality of images of 1 pixel × multiple pixels along the conveyance direction of the single-sided cardboard sheet D, so that a plurality of continuous bright portions W in a predetermined length of the single-sided cardboard sheet D are obtained. And dark part G is defined.

  In this case, the shadow image processing device 58 applies all of the imaging data of the bright portion W and the dark portion G in the width direction of the single-sided cardboard sheet D in the image of the bright portion W and the dark portion G having a predetermined length of the single-sided cardboard sheet D. Addition defines the bright part W and the dark part G. Note that in the image of the bright part W or dark part G having a predetermined length of the single-sided cardboard sheet D, only a part of the image data of the bright part W or dark part G is added in the width direction of the single-sided cardboard sheet D to obtain the bright part W. Or the dark part G may be defined.

  The center defect detecting device 59 determines the shape defect of the center B based on the length of the bright portion W and the length of the dark portion G defined by the shadow image processing device 58. In this embodiment, the core defect detection device 59 determines the shape defect of the core B by comparing the ratio of the length of the bright part W to the length of the dark part G and the determination value. However, this determination method is not limited to the above-described configuration. For example, the length of the bright portion W and the bright portion determination value are compared to determine the shape defect of the core B, or the length of the dark portion G and the dark portion determination value are compared to determine the shape defect of the core B. Alternatively, the shape defect of the core B may be determined by comparing both the length of the bright portion W and the length of the dark portion G with each determination value. That is, when the single-sided cardboard sheet D is conveyed, the bright part W and the dark part G are continuously defined, and the center defect detecting device 59 continuously determines the shape defect of the center B.

  The center B of the single-sided corrugated cardboard sheet D is set with a standard value (design value of the height of the corrugation and pitch) according to the specifications (size, type of flute, etc.) of the double-sided corrugated cardboard sheet F to be manufactured. Has been. When the irradiation angle θ1 of the parallel light S in the irradiation device 51 is set to a predetermined angle, a determination reference value is set in advance by experiments or the like according to the shape of the peak of the core B in the single-sided cardboard sheet D set to the standard value. To do. Although this determination reference value may be used as the determination value, it is desirable to set the determination reference range of the double-sided corrugated cardboard sheet F that is determined to be non-defective by taking into account manufacturing errors and detection errors. Therefore, in this embodiment, the determination area is set by adding a predetermined margin to the determination reference value. That is, if the ratio between the bright part W and the dark part G obtained by processing by the shadow image processing device 58 is within the determination area, the single-sided cardboard sheet D is determined to be non-defective, and if it is not within the determination area, the single-sided cardboard sheet D is determined. Judged as defective. In the case where a defect is determined based on the length of the bright portion W or the length of the dark portion G, a determination region for the length of the bright portion W or the length of the dark portion G is set.

  The determination value (determination area) is set for each type of single-sided cardboard sheet D (type of center core B) and stored in the storage device 56. The single-sided corrugated cardboard sheet D differs in the length of the bright part W and the length of the dark part G because the shape of the shadow is different particularly when the shape (height and pitch) of the core B is different. Therefore, a plurality of types of determination values (determination areas) corresponding to the shape of the core B are set.

  By the way, the corrugating machine 10 described above manufactures a single-sided cardboard sheet D by laminating the back liner C to the corrugated core B, and the double-sided by laminating the front liner A to the core B of the single-sided cardboard sheet D. Corrugated cardboard sheet E is manufactured. In this case, the core B and the back liner C are sheets supplied from the roll paper held by the mill roll stands 11 and 12, and when the remaining roll paper is reduced, a new roll paper is spliced by the splicer. Thus, the sheet can be continuously fed out.

  FIG. 6 is a schematic diagram showing a splicer.

  As shown in FIG. 6, the stand 71 has a pair of roll support arms 72a and 72b supported on both sides, and roll papers B01 and B02 are rotatably supported at the tip portions of the roll support arms 72a and 72b. The roll papers B01 and B02 are obtained by winding cores B11 and B12 having a predetermined length in a roll shape.

  The splicer 70 is configured such that a pair of introduction rolls 74a and 74b, a pair of knives 75a and 75b, and a pair of crimping bars 76a and 76b are sequentially arranged on the header 73 from below to above. In the splicer 70, a nip roll 77 and an acceleration roll 78 are disposed so as to face each other above the pair of crimping bars 76a and 76b. In this case, the introduction rolls 74a and 74b, the knives 75a and 75b, and the crimping bars 76a and 76b are provided so as to be close to and away from each other. A nip roll 77 is provided so as to be able to approach and separate from the acceleration roll 78. In the header 73, a dancer roll 79 and a fixed roll 80 are disposed above the nip roll 77 and the acceleration roll 78. The dancer roll 79 is movable along the horizontal direction according to the tension of the cores B11 and B12.

  Therefore, when the core B11 is fed out from the roll paper B01, the core B11 passes between the introduction rolls 74a and 74b, and then passes between the knives 75a and 75b and between the crimping bars 76a and 76b, and from the acceleration roll 78. The paper is fed via a fixed roll 80 via a dancer roll 79. When the splicer 70 performs splicing, the feeding of the core B11 from the roll paper B01 is stopped, and the splicing is performed by attaching the core B12 fed out from the standby roll paper B02. Accelerate to speed.

  That is, the core B12 is fed out from the roll paper B02 and mounted on the pressure bar 76b, and the feeding speed of the core B11 from the roll paper B01 is reduced. Then, the dancer roll 79 starts to move to the left in FIG. Then, the feeding of the core B11 from the roll paper B01 is stopped, and the crimping bars 76a and 76b are brought close to each other so that the core B12 from the roll paper B02 is pressed against and adhered to the core B11 from the roll paper B01. . At the same time, the core B11 from the roll paper B01 is cut by moving the knife 75a forward.

  During this paper splicing operation, the dancer roll 79 moves to keep the tension of the core B12 from the roll paper B02 constant, while continuing to release the staying core B11. When the core B11 from the roll paper B01 is cut and the core B12 is fed out from the roll paper B02, the nip roll 77 comes into contact with the acceleration roll 78 and the rotation speed of the acceleration roll 78 increases. Thus, the discharge of the staying core B11 is completed, and the dancer roll 79 starts to move rightward in FIG. 6 and returns to the original position.

  The core B11 from the roll paper B01 and the core B12 from the roll paper B02 are overlapped with each other by a predetermined length to form a paper splicing portion. Since this paper splicing portion is a portion where the two cores B11 and B12 are overlapped and thickened, it cannot be made into a product. Therefore, during the manufacture of the double-sided corrugated cardboard sheet F, this paper splice is detected and cut, and the corrugated cardboard sheet is removed from the production line.

  However, since the paper spliced portion is thicker than the other areas of the core B, the corrugated crest is deformed during corrugation processing of the core B, or the core B and the back liner C are bonded. Sometimes adhesion failure occurs. The above-described defect detection device 40 for the corrugated cardboard sheet assumes that the shape of the crest of the core B is deformed when the shape of the crest of the core B in the single-faced cardboard sheet D is different from a preset shape. The sheet D is determined as a defective product. Therefore, not only the single-sided cardboard sheet D whose shape is deformed in the core B but also the single-sided cardboard sheet D having a paper splice is determined to be defective in shape, and the two are discharged in a mixed state. Then, when the defect of the single-sided corrugated cardboard sheet D occurs due to the deformation of the corrugated peak, it becomes difficult for the operator to find the defective double-sided corrugated cardboard sheet F whose corrugated peak is deformed.

  The defect detection device 40 for a corrugated cardboard sheet according to the present embodiment distinguishes a single-sided cardboard sheet D, which has become defective due to the deformation of a corrugated crest, from a single-sided cardboard sheet D having a splicing portion. D is easily verified.

  As shown in FIG. 3, the cardboard sheet defect detection device 40 includes the paper splice portion detection device 57, the center defect detection device 59, and the determination device 60 as described above. Based on the detection result of the paper splicing portion detection device 57 and the detection result of the core flaw detection device 59, the determination device 60 determines the shape of the core B at the paper splicing portion and the core B in the region excluding the paper splicing portion. The shape defect of the core B in the region excluding the paper splicing portion is determined to be the defect of the single-sided cardboard sheet D.

  Here, the paper splice detection device 57 detects a paper splice of the back liner C and a paper splice of the core B. In this case, as shown in FIG. 6, the splicer 70 bonds the center core B11 and the center core B12 to form a paper joint, and then cuts one of the center cores B11 and B12. In the paper splicing portion detection device 57, the transport distance (transport time) from the position where the splicer 70 bonds the core B11 and the core B12 to the position where the imaging device 52 images is known in advance. The timing to reach the imaging position of the core B is output to the determination device 60. Although not shown in the drawing, the same applies to the splicer for splicing the back liner C.

  Note that the spliced portion formed by adhering the core B11 and the core B12 by the splicer 70 is provided with a detected portion, and a detection sensor is provided upstream of the position where the imaging device 52 captures an image. ing. The paper splicing part detection device 57 outputs the timing at which the paper splicing part reaches the imaging position of the core B to the determination device 60 by detecting the detected part provided in the paper splicing part by the detection sensor. May be. Here, the detected part is, for example, a metallic double-sided tape or a printed mark.

  The center defect detection device 59 detects the shape defect of the center B by comparing the ratio of the length of the bright portion W and the length of the dark portion G defined by the shadow image processing device 58 with the determination value. At this time, the core defect detection device 59 detects the shape defect of the core B from the single-sided cardboard sheet D in which the core B is deformed and the single-sided cardboard sheet D in which the core B is deformed by the paper splice. . Therefore, the determination device 60 stops the detection of the shape defect of the core B with respect to the paper spliced portion by the center defect detection device 59. Then, the center defect detecting device 59 detects only the single-sided cardboard sheet D in which the center B is deformed as a shape defect in the center B, and detects the one-sided cardboard sheet D in which the center B is deformed by the paper joint. It is not detected as a shape defect of the core B.

  Then, the display device 55 displays only the image of the core B determined by the determination device 60 as the shape defect of the core B in the area excluding the paper splicing portion. Further, the storage device 56 stores only the image of the core B determined by the determination device 60 as the shape defect of the core B in the area excluding the paper splicing portion. And the alerting | reporting apparatus 54 alert | reports generation | occurrence | production of a defect only when the determination apparatus 60 determines with the shape defect of the core B in the area | region except a paper splice part. Here, the notification is lighting of a lamp or issuing a warning.

  Here, the processing of the cardboard sheet defect determination method performed by the control device 53 will be described in detail. FIG. 7 is a flowchart for explaining a defect detection method for corrugated cardboard sheets, and FIG. 8 is a time chart for explaining the output of a defect detection stop signal to the paper splicing portion.

  As illustrated in FIG. 7, in step S <b> 11, the determination device 60 determines whether the image capturing device 52 captures the core B of the single-sided cardboard sheet D based on the detection signal from the paper splicing portion detection device 57. Determine whether there is a part. Here, if it is determined that there is a paper splice at the imaging position of the core B (Yes), the determination device 60 outputs a defect detection stop signal to the core defect detection device 59 in step S12. Then, the detection of the shape defect of the core B by the core defect detection device 59 is stopped. Specifically, the operation of the imaging device 52 and the processing of the shadow image processing device 58 are stopped.

  As shown in FIG. 8, the passage period Ta is set by securing a margin before and after the length of the paper splicing portion in the detection signal of the paper splicing portion. The detection stop period Tb is set for the defect detection stop signal by securing a margin before and after the passage period Ta. Therefore, at time t1, a failure detection stop signal is output from the determination device 60 to the core failure detection device 59, and from time t2 when the detection stop period Tb has elapsed, the determination device 60 sends a signal to the core failure detection device 59. The output of the defect detection stop signal is stopped. Then, during the detection stop period Tb, the determination device 60 stops outputting the defect detection signal to the core defect detection device 59, and the operation of the core defect detection device 59 stops.

  On the other hand, if it is determined in step S11 that there is no paper splice at the imaging position of the core B (No), the determination device 60 sends a defect detection signal to the core defect detection device 59 in step S13. In step S14, the core defect detection device 59 detects the shape defect of the core B. That is, the shadow image of the core B captured by the imaging device 52 is projected. That is, in a shaded image in which a plurality of images of 1 pixel × multiple pixels are captured and arranged in the transport direction, the imaging data of the bright portion W and the dark portion G are added in the width direction of the single-sided cardboard sheet D, and the added luminance is calculated. . In step S15, noise is removed by smoothing the added luminance in the transport direction. In step S16, the difference is obtained by taking the difference in the added luminance of the pixels adjacent in the transport direction. In step S17, since the difference value is large at the edges of the bright part W and the dark part G, a peak value at which the difference value is large is extracted. In step S18, the length of the bright part W and the length of the dark part G are calculated.

In step S19, the ratio (step ratio) between the length W1 of the bright part W and the length G1 of the dark part G is calculated as follows.
Step density ratio = dark part G length G1 / light part W length W1
In step S20, the ratio between the length W1 of the bright portion W and the length G1 of the dark portion G, that is, the step ratio is compared with the determination region, and it is determined whether the step ratio is within the determination region. To do.

  If it is determined in step S21 that the step ratio is within the determination region (Yes), the shape of the core B is determined to be good, and the process proceeds to step S21, where one peak of the core B is a non-defective product. It is determined that it is normal. On the other hand, if it is determined in step S20 that the step ratio is not within the determination region (No), the process proceeds to step S22 because the core B has a deformed shape. In step S22, it is determined that one peak of the core B is defective. In step S23, the notification device 54 issues an alarm (lamp or alarm sound). In step S24, the display device is displayed. 55 displays an image of the defective product on the display, and the storage device 56 stores this image.

  In this case, the display device 55 displays the image of the single-sided cardboard sheet D imaged by the imaging device 52, and displays the position of the peak of the core B determined as defective with a circle. Then, the storage device 56 stores an image of the core B determined to be defective. In step S25, the defective product discharging apparatus 26 discharges the defective double-sided corrugated cardboard sheet F including the defective peaks from the conveyance line to the outside.

  At this time, as shown in FIG. 3, the defective product discharge device 26 is not only the double-sided cardboard sheet F determined to be defective by the cardboard sheet defect detection device 40 but also the paper detected by the paper splice detection device 57. The defective double-sided corrugated cardboard sheet F including the joint portion is also discharged to the outside from the transport line. In the defective product discharge device 26, a storage portion 26a and a shredder 26b are connected. The control device 53 stores the double-sided corrugated cardboard sheet F determined to be defective by the cardboard sheet defect detection device 40 in the storage unit 26a, and detects a plurality of defects including the paper splicing portion detected by the paper splicing portion detection device 57. The double-sided cardboard sheet F is sent to the shredder 26b and cut. The operator can visually recognize the double-sided corrugated cardboard sheet F that is stored in the storage unit 26a and is determined to have a shape defect of the core B.

  In addition, the process of the defect determination method by the defect detection apparatus 40 of the corrugated cardboard sheet according to the present embodiment is not limited to the one described above. FIG. 9 is a flowchart for explaining a first modification of the cardboard sheet defect detection method, FIG. 10 is a flowchart for explaining a second modification of the cardboard sheet defect detection method, and FIG. 11 is a display device. It is the schematic showing the display screen by.

  In the first modified example of the defect detection method for corrugated cardboard sheets, as shown in FIG. 9, in step S31, the imaging device 52 projects a shadow image of the center core B, and an image of 1 pixel × multiple pixels in the transport direction. The image data of the bright part W and the dark part G is added in the width direction of the single-sided cardboard sheet D in the shaded images arranged and photographed, and the added luminance is calculated. In step S32, noise is removed by smoothing the added luminance in the transport direction. In step S33, the difference is obtained by taking the difference in the added luminance of pixels adjacent in the transport direction. In step S34, since the difference value becomes large at the edges of the bright part W and the dark part G, a peak value at which the difference value becomes large is extracted. In step S35, the length of the bright part W and the length of the dark part G are calculated.

  In step S36, the ratio (step ratio) between the length W1 of the bright part W and the length G1 of the dark part G is calculated. In step S37, the ratio between the length W1 of the bright part W and the length G1 of the dark part G, that is, the step ratio is compared with the determination area, and it is determined whether the step ratio is within the determination area. To do. Here, if it is determined that the step ratio is within the determination region (Yes), it is determined that the shape of the core B is good, and the process proceeds to step S38, where one mountain of the core B is a non-defective product. It is judged as normal. On the other hand, if it is determined (No) that the step ratio is not within the determination region, the process proceeds to step S39 on the assumption that the core B has a deformed shape. In step S39, it is determined that one peak of the core B is defective.

  In step S <b> 40, the determination device 60 determines, based on the detection signal from the paper splicing portion detection device 57, whether the core B that has been abnormally determined to have a bad waveform peak is a paper splicing portion. Here, if it is determined that there is a paper splice at the imaging position of the core B (Yes), this routine is exited without doing anything. On the other hand, if it is determined (No) that there is no paper splicing part at the imaging position of the core B, the notification device 54 issues an alarm (lamp or alarm sound) in step S41, and the display device 55 in step S42. Displays an image of the defective product on the display, and the storage device 56 stores this image. In step S43, the defective product discharge device 26 discharges the defective double-sided corrugated cardboard sheet F including the defective peaks from the conveyance line to the outside.

  Further, in the second modification of the defect detection method for corrugated cardboard sheets, as shown in FIG. 10, steps S51 to S57 are the same as steps S31 to S37 of the first modification described above. Is omitted. In step S57, the ratio between the length W1 of the bright part W and the length G1 of the dark part G, that is, the step ratio is compared with the determination area, and it is determined that the step ratio is within the determination area (Yes). Then, it is determined that the shape of the core B is good and the process proceeds to step S58 to determine normality. On the other hand, if it is determined that the step ratio is not within the determination region (No), the center core B is determined to be deformed, and the process proceeds to step S59 to determine abnormality.

  In step S60, the determination device 60 determines, based on the detection signal from the paper splicing portion detection device 57, whether the core B that has been abnormally determined to have a bad waveform peak is a paper splicing portion, A process of dividing the shape defect of the core B and the paper splicing portion is executed. That is, it is discriminated whether the imaging of the core B determined to be abnormal is a paper splice or not. In step S61, when the core B determined to be abnormal is not a paper splice, the notification device 54 issues an alarm (lamp or alarm sound). In step S62, the display device 55 displays a defective product on the display. The image is displayed, and the storage device 56 stores this image. In step S63, the defective double-sided corrugated cardboard sheet F including defective peaks is discharged from the conveyance line to the outside by the defective product discharge device 26.

  As illustrated in FIG. 11, the display device 55 includes a list display unit 101 and a defective image display unit 102 on a screen. The list display unit 101 displays the image of the core B determined to be abnormal by the determination device 60 with the number, the date of occurrence, the time of occurrence, the content of the abnormality, and the file name. In this case, the contents of the abnormality include a shape defect of the core B, a shape defect of the core B due to the paper splicing portion, and others. The display device 55 includes, as selection switches, a shape defect switch 111 that displays a list of only the shape defects of the core B, a paper splice switch 112 that displays only the shape defects of the core B due to the paper splice, and other shapes. Other switches 113 for displaying only defects and all switches 114 for displaying all shape defects are provided.

  The defective image display unit 102 displays the image of the core B selected from the list display unit 101, and can display the defective portion 120 in the image of the core B. The defective image display unit 102 is provided with an enlargement switch 115 for enlarging the defective portion 120 and a reduction switch 116 for reducing. The operator can confirm the cause of the occurrence by checking the defective portion 120 in the image of the core B determined to be defective in shape by operating the display device 55 during or after the manufacture of the cardboard sheet.

  As described above, in the cardboard sheet defect detection device according to the present embodiment, the paper splice portion detection device 57 that detects the splice portion of the back liner C and the splice portion of the core B, and the shape failure of the core B Based on the detection results of the center defect detection device 59, the paper splice detection device 57, and the detection result of the center flaw detection device 59, the shape defect of the core B at the paper splice and the paper splice are excluded. A determination device 60 that distinguishes the shape defect of the core B in the region is provided.

  Therefore, based on the detection result of the paper joint portion of the back liner C and the core B, and the detection result of the shape failure of the core B, the shape defect and the paper joint portion of the core B at the paper joint portion are detected. The shape defect of the core B in the excluded region is distinguished, and the double-sided corrugated cardboard sheet F that has become defective due to the deformation of the corrugated crest can be easily verified.

  In the corrugated cardboard sheet defect detection device of the present embodiment, the determination device 60 determines that the shape defect of the core B in the region excluding the paper splice is a defect of the double-sided cardboard sheet F. Therefore, it is possible to easily verify the defect of the defective double-sided corrugated cardboard sheet F.

  In the cardboard sheet defect detection device according to the present embodiment, the determination device 60 stops detecting the shape defect of the core B with respect to the paper spliced portion by the core defect detection device 59. Therefore, it is possible to detect only a shape defect during processing or bonding of the core B.

  In the defect detection device for a corrugated cardboard sheet according to the present embodiment, the imaging device 52 that images the core B attached to the back liner C and the determination device 60 determine that the core B has a shape defect in an area excluding the paper splicing portion. A display device 55 capable of displaying only the image of the center core B is provided. Therefore, only the image of the shape defect of the core B in the region excluding the paper splicing portion is displayed on the display device, and the double-sided cardboard sheet F that is defective can be easily verified.

  In the defect detection device for corrugated cardboard sheets of this embodiment, the display device 55 distinguishes and displays a defective image of the core B at the paper splicing portion and a defective image of the core B in the region excluding the paper splicing portion. It is possible. Therefore, the display device 55 can be switched to display only the image of the shape defect of the core B in the area excluding the paper splicing portion, and the defective double-sided cardboard sheet F can be easily verified.

  In the cardboard sheet defect detection device according to the present embodiment, a storage device 56 is provided for storing an image of the core B determined by the determination device 60 as a shape defect of the core B in an area excluding the paper splicing portion. Therefore, it is possible to store only necessary images in the storage device 56 to suppress an increase in storage capacity, and it is possible to easily verify a defective double-sided cardboard sheet F at any time.

  In the cardboard sheet defect detection device according to the present embodiment, a notification device 54 that notifies the occurrence of a defect is provided only when the determination device 60 determines that the shape of the core B is defective in the region other than the paper splicing portion. Therefore, since the notification device 54 notifies only when the shape defect of the core B occurs in the region excluding the paper splicing portion, it is possible to eliminate the trouble of the operator.

  Further, in the cardboard sheet defect removing apparatus according to the present embodiment, the cardboard sheet defect detecting apparatus 40 and the double-sided cardboard cut into a predetermined length including the defective portion detected by the cardboard sheet defect detecting apparatus 40. A defective product discharge device 26 for discharging the sheet F is provided.

  Accordingly, the cardboard sheet defect detection device 40 is configured to detect the core B at the paper splice portion based on the detection result of the paper splice portion of the back liner C and the paper splice portion of the core B and the detection result of the shape defect of the core B. And the defective shape of the core B in the region excluding the paper splicing portion, and only the double-sided corrugated cardboard sheet F that has become defective due to the deformation of the corrugated crest is discharged by the defective product discharge device 26. It is possible to easily verify the double-sided corrugated cardboard sheet F that has become a defective product.

  In the defective removal device for corrugated cardboard sheets according to the present embodiment, the defective product discharge device 26 is configured to remove the double-sided corrugated cardboard sheet F including the defective portion of the central core B at the paper joint and the core B in the region excluding the paper joint. The double-sided cardboard sheet F including the defective portion is distinguished and discharged. Accordingly, the double-sided cardboard sheet F including the defective portion of the core B in the region excluding the paper splicing portion is distinguished from the double-sided cardboard sheet F including the defective portion of the core B at the paper splicing portion and discharged. For this reason, the cause of the defect can be verified by directly viewing the double-sided corrugated cardboard sheet F that has become defective due to the deformation of the corrugated peaks.

  In the corrugated sheet manufacturing apparatus of the present embodiment, the single facer 17 that manufactures the single-sided corrugated sheet D by bonding the back liner C to the corrugated core B and the single facer 17 is used. A double facer 22 for manufacturing a double-sided cardboard sheet E by bonding a front liner A to the center B side of the single-sided cardboard sheet D to be produced, and a defect removal device 90 for the cardboard sheet are provided.

  Accordingly, the single facer 17 manufactures the single-sided cardboard sheet D by bonding the back liner C to the corrugated core B, and the double facer 22 applies the front liner A to the core B side of the single-sided cardboard sheet D. In addition, a double-sided cardboard sheet E is manufactured. At this time, the defect detection device 40 for the corrugated cardboard sheet uses the detection result of the paper splicing portion of the back liner C and the splicing portion of the core B, and the core at the paper splicing portion based on the detection result of the shape defect of the core B. The shape defect of B and the shape defect of the core B in the region excluding the paper splice will be distinguished, and only the double-sided corrugated cardboard sheet F that has become defective due to the deformation of the corrugated crest will be discharged by the defective product discharge device 26. It is possible to easily verify the double-sided corrugated cardboard sheet F that has become a defective product.

  In the above-described embodiment, the core defect detection device includes the irradiation device 51, the imaging device 52, and the shadow image processing device 58, and irradiates the core B with the light by irradiating light. The configuration is such that the shape defect of the core B is determined based on the length of the bright portion W and the length of the dark portion G of the core B in the captured image. However, the present invention is not limited to this configuration. . For example, the shape defect of the core B may be determined using a height sensor or the like as the core defect detection device.

  In the above-described embodiment, the corrugating machine 10 manufactures a double-sided cardboard sheet in which the single-sided cardboard sheet D1, the single-sided cardboard sheet D2, and the front liner A are bonded together. However, the single-sided cardboard sheet D2 (D1) It is good also as what manufactures the double-sided cardboard sheet | seat which bonded the front liner A.

10 Corrugating machine (corrugated cardboard 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 scorer 25 Cut-off 26 Defective product ejector 27 Stacker 40 Corrugated cardboard sheet Detection device 40A First failure detection device 40B Second failure detection device 43, 44, 45, 46 Guide roller 51 Irradiation device 52 Imaging device 53 Control device 54 Notification device 55 Display device 56 Storage device 57 Paper splice detection device 58 Shadow image Processing device 59 Core defect detection device 60 Judgment device 61 Defect position identification device 62 Tracking device 70 Splicer 90 Corrugated sheet defect removal device A Table liner (first liner)
B Core C Back liner (second liner)
D Single-sided cardboard sheet E, F Double-sided cardboard sheet W Bright part G Dark part

Claims (10)

In the cardboard sheet defect detection device for detecting defects in the cardboard sheet with the corrugated core attached to the liner,
A paper splice detection device for detecting the paper splice of the liner and the core splice;
A core defect detection device for detecting the shape defect of the core;
Based on the detection result of the paper splicing part detection device and the detection result of the core flaw detection device, the shape failure of the core at the paper splicing part and the shape failure of the core in the region excluding the paper splicing part A determination device for distinguishing between
A defect detection device for cardboard sheets, comprising:   The cardboard sheet defect detection apparatus according to claim 1, wherein the determination apparatus determines that a shape defect of the core in a region excluding the paper splicing portion is a defect of the cardboard sheet.   The cardboard sheet defect detection device according to claim 1, wherein the determination device stops detecting the shape defect of the core with respect to the paper splicing portion by the core defect detection device.   An imaging device for imaging the core attached to the liner, and a display device capable of displaying only the image of the core determined by the determination device as a shape defect of the core in an area excluding the paper splicing portion. The defect detection device for a corrugated cardboard sheet according to any one of claims 1 to 3, wherein the cardboard sheet defect detection device is provided.   The display device is capable of distinguishing and displaying the image of the defective core at the paper splicing portion and the image of the defective core at a region excluding the splicing portion. 5. A defect detection apparatus for corrugated cardboard sheets according to 4.   6. The storage device according to claim 1, wherein the determination device includes a storage device that stores an image of the core that is determined to have a shape defect of the core in an area excluding the splicing portion. The defect detection apparatus for cardboard sheets according to one item.   7. The notification device according to claim 1, wherein the determination device is provided with a notification device that notifies the occurrence of a defect only when the shape of the core is determined to be defective in an area excluding the splicing portion. The defect detection apparatus for cardboard sheets according to one item. A defect detection apparatus for cardboard sheets according to any one of claims 1 to 7,
A discharge device for discharging the double-sided cardboard sheet cut into a predetermined length including the defective portion detected by the defect detection device for the cardboard sheet;
A defect removal apparatus for corrugated cardboard sheets, comprising:   The discharge device distinguishes and discharges the double-sided cardboard sheet including the defective portion of the core in the paper splicing portion and the double-sided cardboard sheet including the defective portion of the core in the region excluding the paper splicing portion. The defect removal apparatus for corrugated cardboard sheets according to claim 8. A single facer for producing a single-sided cardboard sheet by laminating a second liner to a corrugated core;
A double facer for producing a double-sided cardboard sheet by bonding a first liner to the core side of the single-sided cardboard sheet;
The defect removal apparatus for cardboard sheets according to claim 8 or 9,
An apparatus for manufacturing a corrugated cardboard sheet.

Images