WO2013046402A1 - Procédé pour inspecter et système pour inspecter des filtres de cigarette - Google Patents

Procédé pour inspecter et système pour inspecter des filtres de cigarette Download PDF

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Publication number
WO2013046402A1
WO2013046402A1 PCT/JP2011/072437 JP2011072437W WO2013046402A1 WO 2013046402 A1 WO2013046402 A1 WO 2013046402A1 JP 2011072437 W JP2011072437 W JP 2011072437W WO 2013046402 A1 WO2013046402 A1 WO 2013046402A1
Authority
WO
WIPO (PCT)
Prior art keywords
center hole
tobacco filter
filter
filter according
peripheral edge
Prior art date
Application number
PCT/JP2011/072437
Other languages
English (en)
Japanese (ja)
Inventor
佐藤　潤
Original Assignee
日本たばこ産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本たばこ産業株式会社 filed Critical 日本たばこ産業株式会社
Priority to PCT/JP2011/072437 priority Critical patent/WO2013046402A1/fr
Publication of WO2013046402A1 publication Critical patent/WO2013046402A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/32—Separating, ordering, counting or examining cigarettes; Regulating the feeding of tobacco according to rod or cigarette condition
    • A24C5/34—Examining cigarettes or the rod, e.g. for regulating the feeding of tobacco; Removing defective cigarettes
    • A24C5/3412—Examining cigarettes or the rod, e.g. for regulating the feeding of tobacco; Removing defective cigarettes by means of light, radiation or electrostatic fields
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0295—Process control means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores

Definitions

  • the present invention relates to an inspection system suitable for inspection for a cigarette filter, particularly a center hole filter, and an inspection method thereof.
  • a center hole filter (hereinafter referred to as CH filter) is known (for example, see Patent Document 1 below).
  • the CH filter is formed into a rod shape by thermoforming, and has a center hole penetrating the CH filter on its axis.
  • the CH filter is suitable for appropriately adjusting the ratio of cigarette smoke to the amount of air when cigarette is smoked, that is, the filtration efficiency of cigarette smoke by the CH filter. .
  • the center hole is at the suction end of the filter cigarette, that is, the end face of the CH filter. Exposed outside.
  • appearance defects such as irregularities on the inner peripheral surface of the center hole and deformation of the center hole greatly affect the quality of the filter cigarette. Therefore, the center hole appearance defect is important in guaranteeing the quality of the filter cigarette. It becomes the inspection object.
  • the inspection of the appearance defect is conventionally performed by an inspector periodically removing the CH filter from the production line and visually checking the extracted CH filter.
  • Such an off-line visual inspection by an inspector may cause variations in inspection accuracy due to the inspection skill of each individual inspector, and a large amount of defective CH filters may be manufactured.
  • an object of the present invention is to provide an inspection system and an inspection method for the above-described CH filter.
  • an inspection system for a tobacco filter according to the present invention which is disposed in a transfer path for transferring a hollow tobacco filter having a center hole, images the end surface of the tobacco filter, and A camera for generating an image, an image processing device for processing an end face image and detecting a peripheral edge of the center hole, and whether or not an appearance defect of an inner peripheral surface in the center hole is within an allowable range based on the detected peripheral edge And a determination device for determining whether or not.
  • the image processing device detects the outer periphery and the inner periphery of the end face as edge point distribution rings, respectively, and the determination device determines the center hole based on the deviation of the distribution ring from the reference line indicating the reference shape of the center hole. Includes a calculation section that calculates the non-smooth amount of the inner peripheral surface as an appearance defect, and a determination section that determines whether or not the non-smooth amount is within an allowable range.
  • the image processing apparatus assumes large and small search circles each having a diameter larger than the large and small prescribed diameters for the outer periphery and the inner periphery, and responds based on scanning within the search circle. Detect edge points of distribution ring.
  • the calculation section calculates a value obtained by multiplying the sum of the distances between the defect edge points that deviate from the reference line beyond the allowable range and the reference line by the number of defect edge points as a non-smooth amount.
  • the calculation section can further calculate the non-roundness of the distribution ring as an appearance defect. In this case, the calculation section calculates the non-roundness based on the difference between the maximum diameter and the minimum diameter of the distribution ring.
  • the present invention further provides an inspection system implemented by the above-described inspection system. Furthermore, further objects and advantages of the present invention will become apparent from the following description.
  • the appearance defect of the center hole is automatically inspected during the cigarette filter transfer process. Therefore, when a defective cigarette filter is detected, the defect from the transfer path is detected. It is possible to eliminate defective tobacco filters. Therefore, a defective cigarette filter is not used in the manufacture of filter cigarettes. In addition, if the defect of the cigarette filter is fed back to the cigarette filter manufacturing machine, it greatly helps to further improve the reliability of the manufacturing machine.
  • the CH filter F as an inspection object of the present invention has a rod shape and has a center hole CH on its axis.
  • this type of CH filter is obtained by thermoforming a web-like filter fiber material having thermoplasticity into a rod shape.
  • FIG. 2 schematically shows a CH filter F manufacturing machine.
  • the manufacturing machine includes a thermoforming device 10, which includes a mandrel and a mold that surrounds the mandrel.
  • the mandrel and the mold are not shown, but both the mandrel and the mold can be heated.
  • the filter fiber material is supplied to the thermoforming apparatus 10 and is formed into a hollow continuous rod R as it passes between the mandrel and the mold.
  • the mandrel and the forming die thermoform the inner peripheral surface and the outer peripheral surface of the continuous rod R, respectively.
  • the formed continuous rod R is sent from the thermoforming device 10 toward the cutting device 12, which cuts the continuous rod R into individual CH filters F, while passing these CH filters F along the delivery line DL. Transmit intermittently.
  • the delivered CH filter F is received by the transfer path TL, and then transferred to the subsequent boxing machine or filter cigarette manufacturing machine on the transfer path TL.
  • the transfer path TL includes a catcher drum 14 at the start thereof, and the catcher drum 14 is disposed downstream of the cutting device 12.
  • the catcher drum 14 has an axis parallel to the delivery line DL, and can rotate around this axis.
  • the catcher drum 14 includes a number of receiving seats 16, and these receiving seats 16 are arranged on the outer peripheral surface of the catcher drum 14 at equal intervals. While the catcher drum 14 is rotating, each receiving seat 16 sequentially passes through the delivery line DL described above. Specifically, each receiving seat 16 receives one CH filter F sent from the cutting device 12 when passing through the sending line DL, and holds the received CH filter F by suction in the circumferential direction of the catcher drum 14. Transport to. That is, the catcher drum 14 converts the transfer direction of the CH filter F into a direction orthogonal to the axial direction of the CH filter F.
  • the inspection camera 18 is arranged in the transfer path TL described above. Specifically, the inspection camera (CCD camera) 18 is positioned in the vicinity of the catcher drum 14 and sequentially photographs the end face of the CH filter F transferred along the outer peripheral surface of the catcher drum 14. Further, a ring light 20 as a light source is disposed between the inspection camera 18 and the catch drum 14, and the ring light 20 uniformly illuminates the end face of the CH filter F passing through the inspection camera 18.
  • a trigger sensor 22 is disposed upstream of the inspection camera 18 when viewed in the transfer direction of the CH filter F on the catcher drum 14.
  • the trigger sensor 22 optically detects passage of the CH filter F, and transmits a trigger signal to the inspection camera 18 at a timing when the detected CH filter F passes the inspection camera 18. Therefore, the inspection camera 18 can capture the end face of the CH filter F passing through the inspection camera 18 by performing an imaging operation at the timing when the trigger signal is received, and transmits the captured end face image as an electrical signal. To do.
  • the inspection camera 18 is electrically connected to the image processing device 24, and the image processing device 24 receives an electrical signal transmitted from the inspection camera 18, that is, an end face image, and outputs the end face image to the end face image.
  • Predetermined image processing is performed.
  • the image processing device 24 has software for performing edge detection processing on the end face image, and extracts the outer peripheral edge of the CH filter F and the inner peripheral edge of the center hole CH. The extraction here will be specifically described with reference to FIGS.
  • FIG. 3 shows an end face image P of the CH filter F arranged at the center of the display screen 26.
  • hatching is added to the end face image P, while distortions of the outer peripheral edge OE and the inner peripheral edge IE in the end face image P are exaggerated.
  • search circles C I and C O inside and outside are drawn on the display screen 26, and these search circles C I and C O both have a diameter centered on the reference position O at the center of the display 26.
  • the diameter of the inner search circle C I is sufficiently larger than the predetermined diameter of the inner peripheral edge IE, smaller than the specified diameter of the outer peripheral edge OE, contrast, the diameter of the outer search circle C O peripheral edge OE Is sufficiently larger than the prescribed outer diameter.
  • the positions of the inner peripheral edge IE and the outer peripheral edge OE existing on the line SL are detected.
  • the position detection here is performed based on the difference between the pixel density of the background on the display screen 26 and the pixel density of the end face image P.
  • the position detection of the inner peripheral edge IE and the outer peripheral edge OE described above is repeated over the entire circumference of the end face image P while the scanning line SL is shifted by a predetermined angle in the circumferential direction of the end face image P.
  • the inner peripheral edge IE or the outer peripheral edge OE is represented by a distribution ring of edge points EP as shown in FIG.
  • the search circles C I and C O described above minimize the scanning range of the inner peripheral edge IE and the outer peripheral edge OE, and greatly contribute to efficient detection of the edge point EP. .
  • the above-described image processing device 24 is electrically connected to the determination device 28, and transfers the inner and outer distribution rings representing the inner peripheral edge IE and the outer peripheral edge OE to the determination device 28.
  • the determination device 28 has software for determining the quality of the center hole CH based on the transferred distribution ring, and the determination procedure here becomes clear from the inspection routines shown in FIGS.
  • Steps S1 and S2 shown in FIG. 5 are included in the software of the image processing device 24 described above, and the software of the determination device 28 includes steps after step S3.
  • the center hole CH is shown based on the least square method from each edge point EP (see FIG. 4) representing the positions of the inner peripheral edge IE and the outer peripheral edge OE as viewed in XY coordinates centered on the reference position O.
  • An estimated inner circle and an estimated outer circle indicating the outer periphery of the CH filter F are calculated.
  • step S4 the radius and center of each of the estimated inner circle and the estimated outer circle, and the center distance between the center of the estimated inner circle and the center of the estimated outer circle are calculated (step S4).
  • the estimated inner circle and the estimated outer circle are denoted by reference symbols IC and OC, respectively, and the radius and center of the estimated inner circle and the estimated outer edge are denoted by R I and R O and the centers O I and O O.
  • reference symbol ⁇ D indicates the center-to-center distance.
  • step S5 whether the diameter of the estimated outside circle OC obtained from the radius R O is in the allowable range (step S5), and the diameter of the estimation within a circle IC obtained from the radius R I allowed It is sequentially determined whether or not it is within the range (step S6) and whether or not the center-to-center distance ⁇ D is within the allowable range (step S7).
  • step S8 shown in FIG. 6 is performed, and in this step S8, a failure indicating that the CH filter F to be inspected is defective.
  • a signal is output, and the failure signal here includes the degree of failure and the location of the failure.
  • the failure signal can be used to adjust the outer diameter of the CH filter F to be manufactured and the diameter of the center hole CH with respect to the manufacture of the CH filter F by the thermoforming apparatus 10 described above, while the transfer path TL. Therefore, it can be used to eliminate defective CH filter F.
  • the inspection regarding the outer diameter and inner diameter of the CH filter F and the positional deviation of the center hole CH is performed online, and the defective CH filter F can be excluded from the transfer path TL. Therefore, the defective CH filter F is not supplied to the aforementioned boxing machine or filter cigarette manufacturing machine. As a result, manufacture of a filter cigarette including a defective CH filter F is reliably avoided.
  • step S9 the model wheel of the center hole CH, that is, the reference model line is read.
  • the reference model line is a reference circle. Based on this reference circle, the smoothness of the inner peripheral surface of the center hole CH is detected (step S10).
  • FIG. 8 a region SA in which the reference circle BC and the distribution ring DR are separated from each other is shown as a line, and this region SA indicates a recess in the inner peripheral surface of the center hole CH.
  • the difference between the reference circle BC and the edge point EP on this line segment A distance ⁇ L is calculated.
  • Such a difference distance ⁇ L is calculated for all edge points EP.
  • a difference distance ⁇ L O outside the allowable range is extracted from the obtained difference distance ⁇ L, and this difference distance ⁇ L O indicates the degree of defects related to smoothness. Therefore, the maximum value of the difference distance ⁇ L O indicates, for example, the maximum defect level of the area SA.
  • the area SA shown in FIG. 8 is a bump-like defect protruding from the inner peripheral surface of the center hole CH, but is recessed from the inner peripheral surface of the center hole CH as shown in FIG. 9A.
  • step S12 the maximum diameter and the minimum diameter of the distribution ring DR of the edge point EP are calculated (step S12). Specifically, with respect to a plurality of pairs of edge points EP spaced apart in the diameter direction of the search circle C 1 across the center of the search circle C 1 , that is, the reference position O, the separation distance between the paired edge points EP. Are respectively calculated. As shown in FIG. 10, the maximum and minimum separation distances among the separation distances are determined as the maximum diameter LD and the minimum diameter SD.
  • the situation in which the determination result in step S14 is false indicates that the distribution ring DR, that is, the center hole CH is not a circle but an ellipse.
  • the above-described step S8 is performed from step S14, and a failure signal is output.
  • step S14 when the determination result of step S14 is true, the steps after step S1 are repeatedly performed to check the next CH filter F.
  • steps after Step S9 described above an appearance defect of the center hole CH is inspected for non-smoothness and non-roundness of the inner peripheral surface of the center hole CH, and the CH filter F having the appearance defect is also removed from the transfer path TL. Since it can be eliminated, the production of defective filter cigarettes due to appearance defects is also reliably avoided.
  • the inspection routine is performed. After outputting the failure signal in step S8, the inspection of the CH filter F that is the inspection object is terminated, so that the inspection routine is not performed wastefully.
  • the failure signal can indicate a failure location of the CH filter F, it is useful for manufacturing management of the CH filter F.
  • the present invention is not limited to the inspection system and inspection method of the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention.
  • thermoforming apparatus 12 cutting device 14 catcher drum 18 camera 20 ring light 24 image processing apparatus 28 determines device F CH filter O reference position O I, O O center R I, R O radius P end face image BC reference circle C I, C o Search circle CH Center hole DL Transmission line DR Distribution ring EP Edge point IC Estimated inner circle IE Inner edge OC Estimated outer circle OE Outer edge SL Scan line TL Transfer path ⁇ D Center distance ⁇ L Difference distance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Toxicology (AREA)
  • Image Analysis (AREA)

Abstract

L'invention porte sur un procédé pour inspecter et sur un système pour inspecter des filtres de cigarette, l'objet de l'inspection étant des filtres de cigarette creux (F) ayant un trou central (CH), une image de la surface d'extrémité d'un filtre de cigarette (F) étant prise par une caméra (18), générant une image de surface d'extrémité (P), pendant le processus de transport du filtre de cigarette (F), le bord périphérique du trou central (CH) étant détecté à l'aide d'un traitement d'image de l'image de surface d'extrémité (P), après quoi il est déterminé si oui ou non des défauts d'aspect de la surface périphérique interne du trou central rentrent à l'intérieur d'une plage admise sur la base du bord périphérique détecté.
PCT/JP2011/072437 2011-09-29 2011-09-29 Procédé pour inspecter et système pour inspecter des filtres de cigarette WO2013046402A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/072437 WO2013046402A1 (fr) 2011-09-29 2011-09-29 Procédé pour inspecter et système pour inspecter des filtres de cigarette

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Application Number Priority Date Filing Date Title
PCT/JP2011/072437 WO2013046402A1 (fr) 2011-09-29 2011-09-29 Procédé pour inspecter et système pour inspecter des filtres de cigarette

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9402416B2 (en) 2012-10-23 2016-08-02 Essentra Filter Products Development Co. Pte. Ltd. Detection system
JP2018112454A (ja) * 2017-01-11 2018-07-19 株式会社アセット・ウィッツ 管材の内面自動検査装置及び管材内面の自動検査方法
JP2018205098A (ja) * 2017-06-02 2018-12-27 株式会社アセット・ウィッツ 管材内面自動検査装置
WO2023174857A1 (fr) * 2022-03-14 2023-09-21 Philip Morris Products S.A. Procédé de contrôle d'une zone de ventilation d'un article de génération d'aérosol pour des défauts de fabrication

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523158A (ja) * 1991-07-17 1993-02-02 Daicel Chem Ind Ltd シガレツトフイルター
JPH08210826A (ja) * 1994-09-30 1996-08-20 Philip Morris Prod Inc 実質的に円形の物体の外観を検査する方法および装置
JP2001292757A (ja) * 2000-04-12 2001-10-23 Japan Tobacco Inc シガレット検査装置
JP2005134294A (ja) * 2003-10-31 2005-05-26 Daido Steel Co Ltd 円筒状部品の形状検査方法および形状検査装置
WO2011117984A1 (fr) * 2010-03-24 2011-09-29 日本たばこ産業株式会社 Procédé et dispositif d'inspection de filtre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523158A (ja) * 1991-07-17 1993-02-02 Daicel Chem Ind Ltd シガレツトフイルター
JPH08210826A (ja) * 1994-09-30 1996-08-20 Philip Morris Prod Inc 実質的に円形の物体の外観を検査する方法および装置
JP2001292757A (ja) * 2000-04-12 2001-10-23 Japan Tobacco Inc シガレット検査装置
JP2005134294A (ja) * 2003-10-31 2005-05-26 Daido Steel Co Ltd 円筒状部品の形状検査方法および形状検査装置
WO2011117984A1 (fr) * 2010-03-24 2011-09-29 日本たばこ産業株式会社 Procédé et dispositif d'inspection de filtre

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9402416B2 (en) 2012-10-23 2016-08-02 Essentra Filter Products Development Co. Pte. Ltd. Detection system
US9867395B2 (en) 2012-10-23 2018-01-16 Essentra Filter Products Development Co. Pte. Ltd. Detection system
JP2018112454A (ja) * 2017-01-11 2018-07-19 株式会社アセット・ウィッツ 管材の内面自動検査装置及び管材内面の自動検査方法
JP2018205098A (ja) * 2017-06-02 2018-12-27 株式会社アセット・ウィッツ 管材内面自動検査装置
WO2023174857A1 (fr) * 2022-03-14 2023-09-21 Philip Morris Products S.A. Procédé de contrôle d'une zone de ventilation d'un article de génération d'aérosol pour des défauts de fabrication

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