JP4428106B2 - Pinhole inspection device for skiving line of liquid paper container - Google Patents

Description

  The present invention relates to a pinhole inspection device in a skive processing line of a liquid paper container formed of a composite sheet in which a paperboard is used as a base material layer and synthetic resin layers capable of heat-sealing and sealing are laminated on both front and back surfaces.

  In general, as a liquid paper container, there is a rectangular tube-shaped liquid paper container called a paper pack for hermetically wrapping liquids such as milk, juices, and alcoholic beverages. There is a rectangular cylindrical liquid paper container formed of a composite sheet in which a synthetic resin layer that can be attached and sealed is laminated and a plastic film or aluminum foil is laminated as an intermediate layer.

  In general, a packaging material for producing a rectangular tube-shaped liquid paper container is a blank sheet using a composite sheet, for example, polyethylene, or a surface that becomes the inner surface of the container on both sides of the blank sheet that becomes the inner and outer surfaces of the container In addition, a packaging material in which polyethylene (polyethylene terephthalate) and polyethylene are laminated on the outer surface is used.

  As the intermediate layer of the blank sheet, for example, a synthetic resin film such as nylon or polyethylene terephthalate, or an aluminum foil is used.

  In general, as shown in FIG. 6 (a), the blank sheet S used for box making of a rectangular tube-shaped liquid paper container is formed by folding the four side wall plates 1, 2, 3, 4 and the sticking plate 5 respectively. A cylindrical body A (rectangular tubular body) that is provided continuously through the bottom wall, a bottom surface B that is provided continuously through a crease on the lower side of each of the four side wall plates, and an upper side of each of the four side wall plates. And an upper surface portion C continuously provided through a fold, and a synthetic resin layer such as polyethylene or polyethylene terephthalate that can be heat-sealed is provided on the front and back surfaces thereof.

  In the body A shown in FIG. 6A, the four side wall plates 1, 2, 3, 4 and the sticking plate 5 are connected in series via parallel folds a.

  In addition, the bottom surface portion B has a bottom plate 21, a lower folded isosceles triangular plate 22 having an apex angle of 90 °, and a folding plate 22a, 22b, a bottom plate 23 on the lower isosceles side of the triangular plate 22, respectively. A lower folded isosceles triangular plate 24 having an apex angle of 90 °, folding plates 24a and 24b on the lower isosceles side of the triangular plate 24; 23a and 24c are connected through folds c, i, j, k, and m, respectively.

  Further, the upper surface portion C has a cover plate 11 in order on the upper side of each of the four side wall plates, a joint-attached outer plate 11a on the upper side of the cover plate 11, an upper folded isosceles triangular plate 12 having apex angles of 45 ° to 90 °, and the triangular plate. Folding plates 12a and 12a on the upper side of the twelve sides, adhesive inner plates 12b and 12b on the upper side of the folding plate 12a, the cover plate 13, the gluing sticking outer plate 13a on the upper side of the cover plate 13 and apex angles of 45 ° to 90 ° The upper folded isosceles triangular plate 14 and the isosceles upper side of the triangular plate 14 are the folding plates 14a and 14a and the inner plates 14b and 14b on the upper side of the folding plate 14a are formed with folds b, e, f, g and h, respectively. It is connected through.

When a rectangular tube-shaped liquid paper container is produced using the blank sheet S, the rear outer edge (shaded area) of the sticking plate 5 on the side wall plate 4 side of the blank sheet S shown in FIG. Each of the paperboard base material layer S and the both sides of the paper sheet base material S laminated on the front and back surfaces, as shown in the enlarged side sectional view of the blank sheet S shown in FIG. A thin portion E region having a thickness t of T / 2 is formed with respect to the total thickness T of the blank sheet S formed by a composite sheet composed of the synthetic resin layers S1 and S2, and the four side wall plates 1 and 2 shown in FIG. 3, 4, and the sticking plate 5 are each folded into a rectangular tube shape through the crease a, and as shown in the enlarged side sectional view of the blank sheet in FIG. The thin part E region of the plate 5 is folded in half through the crease d, and the end portion (near the crease d) that becomes the liquid contact surface Next, a liquid-resistant edge protector is formed by the synthetic resin layer S2.

  Then, among the four side wall plates 1, 2, 3, and 4 bent into a rectangular tube shape, the adhesive plate 5 is overlapped on the inner surface of the side wall plate 1, and the resin layer on the inner surface is overlapped with hot air or the like. The body A is formed by heat-melting and pasting with pressure and forming a blank sheet into a rectangular tubular body.

  Subsequently, the folded isosceles triangular plates 22 and 24 having an apex angle of 90 ° formed into a rectangular tube on the lower side of the trunk A are folded inwardly of the rectangular tube through the fold. The bottom plates 21 and 23 are folded flat inward through the folds, and the folded and stuck inner plates 22c, 23a and 24c are overlapped and folded outward, and the folded and stuck inner plates 22c, Since the bottom plate 21 is flatly overlapped on the bottom plate 23 from the upper side of 23a and 24c, and the bottom plates 21 and 23 are not pressed from both the inner and outer surfaces of the overlapping, the overlapping inner surface resin is heated by hot air or the like. Then, by melting and pressing and sticking in a hermetically sealed state, a flat bottom surface portion B of the container is formed at the lower portion of the body portion A as shown in FIG.

  When the bottom surface portion B is formed, a predetermined amount of liquid content is filled from the opening side of the upper surface portion C on the upper side of the body portion A, and then the upper folded isosceles triangular plates 12, 14 having apex angles of 45 ° to 90 °. The folding plates 12a and 12a and the folding plates 14a and 14a connected to them are folded inward, and the lid plates 11 and 13 are folded inward through the folds so that they are overlapped with each other. The joint-pasting outer plates 11a and 13a and the pasting inner plates 12b, 12b, 14b, and 14b are brought into a jointed state as shown in FIG. 8 (a), and the overlapping is performed as shown in FIG. 8 (b). While the resin on the inner surface is heated and melted with hot air or the like, it is sealed from both sides of the outer plates 11a and 13a by sealing bars 27 and 28 of the pressure sealing means 26 from both sides in the direction of the arrows. Top part C by sticking to the state Is formed, and a rectangular tubular liquid paper container is made.

  Here, when the apex angle of the upper folded isosceles triangular plates 12 and 14 is an angle of 45 ° or more and less than 90 °, the lid plates 11 and 13 are butted against each other, as shown in FIG. A container having a top surface portion C of a govel top type (a slanted roof type) is formed. On the other hand, in the case of an angle of 90 °, the lid plates 11 and 13 are folded flat in a horizontal state. A container (not shown) having a flat top type upper surface portion C is formed.

The known patent documents are described below.
Prior art of JP-A-10-72028

  By the way, the blank sheet S used for box making of the rectangular tube-shaped liquid paper container has a crease a at the rear outer edge (hatched area) of the sticking plate 5 on the side wall plate 4 side of the blank sheet S shown in FIG. When the thin portion E is cut by cutting means (skiving means) in parallel to form a thin portion E as shown in FIG. 7A, the cutting pressure, cutting speed, etc. of the cutting means, Due to subtle variations in the processing conditions such as the material of the blank sheet S composed of the base material layer S and the synthetic resin layers S1 and S2, fine pins are applied to the paperboard base material layer S and the synthetic resin layer S2 on the surface of the thin portion E region. Holes (air-permeable holes, holes that easily generate air permeability) are easily generated.

In particular, when a pinhole is generated in the vicinity of the fold d of the thin portion E and in the vicinity thereof, the fold d
When the sheet is folded and edge protected, there may be a problem that the inner surface liquid resistance of the end of the blank sheet S on the fold line d side of the container after box making is lowered. It is necessary to accurately and accurately inspect the presence / absence of pinholes along the part of the crease d in the part E.

  The present invention accurately and efficiently detects the presence or absence of pinholes along the crease d in the skived thin portion E of the blank sheet S used for box-shaped liquid paper container boxing. There is to be able to do it.

  The invention according to claim 1 of the present invention has a predetermined width along the outer end portion of the sticking plate 5 serving as the cylindrical end portion of the blank sheet S used for box making of the cylindrical liquid paper container that is transported and moved. An adhesive application means 30 for applying an adhesive to the thin portion E formed by skiving, a folding means 60 for folding the thin portion E 180 degrees from a flat state at a fold d passing through the center thereof; Between the light projecting means 41 and the blank sheet S, which are disposed to be opposed to each other in the vertical direction of the sheet S with a right-angle bent part bent at a substantially right angle at a fold d of the thin-walled part E in the middle of folding by the bending means 60. A pinhole detecting means 40 comprising an image receiving means 42 having a linear optical image receiving field in a linear line direction perpendicular to the conveying movement direction, and at the bent portion of the thin portion E of the blank sheet S that is conveyed and moved Through the generated pinhole Pinhole inspection in a skive processing line of a liquid paper container characterized in that the occurrence of pinholes is detected by receiving and detecting the irradiation light of the light projecting means 41 as an image by the image receiving means 42 Device.

  According to a second aspect of the present invention, in the pinhole inspection device in the skive processing line for the liquid paper container according to the first aspect, the tubular liquid paper container can be boxed before the adhesive application means 30. A liquid paper container comprising a cutting means 50 that forms a thin portion E by skiving to a predetermined width along an outer end portion of a sticking plate 5 serving as a cylindrical end portion of a blank sheet S to be used. It is a pinhole inspection device in the skive processing line.

The invention according to claim 3 of the present invention is the pinhole inspection device in the skive processing line of the liquid paper container according to claim 1 or 2, wherein the image receiving means 42 of the pinhole detection means 40 is formed of the thin portion E. By detecting the irradiation light of the light projecting means 41 that has passed through the pinhole generated in the bent portion as an image, a pinhole occurrence detection signal is immediately transmitted, and the transport units 51 and 61 receive it as a stop signal. Based on the signal, the conveying sections 51 and 61 are temporarily stopped to stop the conveyance of the blank sheet S. During the stop, the blank sheet S in which pinholes are generated is removed and reset, by releasing the stop operation by, restarts the detection of pinholes reconveying is operated by transporting moves the blank sheet S to the conveying section 51 and 61 A pinhole inspection apparatus according skived lines of the liquid feed container, characterized in that the way.

  The invention according to claim 4 of the present invention is the pinhole inspection device in the skive processing line of the liquid paper container according to any one of claims 1 to 3, wherein the image receiving means 42 of the pinhole detection means 40 is provided. A pinhole inspection device in a skive processing line for a liquid paper container, which is a CCD line sensor or a linear CCD camera.

  The invention according to claim 5 of the present invention is the pinhole inspection device in the skive processing line of the liquid paper container according to any one of claims 1 to 4, wherein the light projecting means 41 of the pinhole detecting means 40 is provided. A pinhole inspection apparatus for a liquid paper container skive processing line, which is a fiber light guide type halogen light source.

The invention according to claim 6 of the present invention is the pinhole inspection device in the skive processing line of the liquid paper container according to any one of claims 1 to 5, wherein the light projecting means 41 of the pinhole detecting means 40 A pinhole inspection apparatus in a skiving line of a liquid paper container, wherein a projected light beam diameter φ is 5 mm and a line-shaped image receiving field width f of the image receiving means 42 is 85 mm.

  The invention according to claim 7 of the present invention is linearly conveyed by the folding means 60 in the pinhole inspection apparatus in the skive processing line of the liquid paper container according to any one of claims 1 to 6. At least in the installation position of the light projection means 41 and the image receiving means 42 of the pinhole detection means 40 and the front and back positions thereof in the folding path of the thin portion E bent at a substantially right angle of the blank sheet S. The guide plate 45 that horizontally guides the horizontal surface of the bent portion and the guide plate 46 that vertically guides the vertical surface of the thin portion E of the blank sheet S that is conveyed to the thin sheet E are installed at predetermined intervals. Is a pinhole inspection device in a skive processing line for a liquid paper container.

  The invention according to claim 8 of the present invention is the pinhole inspection device in the skive processing line of the liquid paper container according to claim 7, wherein the guide horizontally guides the horizontal surface of the bent portion in the thin portion E of the blank sheet S. A line-shaped image receiving field in a linear line direction perpendicular to the conveyance movement direction of the blank sheet S is widened at a portion corresponding to the opposed installation of the light projecting means 41 and the image receiving means 42 of the pinhole detecting means 40 at the front edge of the plate 45. A pinhole inspection device in a skive processing line of a liquid paper container, characterized in that a semicircular light receiving cutout 45a having a radius of 2.5 mm is provided.

  The pinhole inspection apparatus in the skive processing line of the liquid paper container of the present invention is along the outer end of the sticking plate 5 at the cylindrical end of the blank sheet S used for box making of the cylindrical liquid paper container. The thin portion E having a predetermined width formed by skiving by the cutting means is introduced into the adhesive applying means 30, and the adhesive is applied to the skived surface of the thin portion E and then introduced into the bending means 60. Then, the pinhole detecting means 40 while linearly transporting the bent portion of the thin portion E of the blank sheet S bent at a substantially right angle by the bent plate 62 at the fold d passing through the central portion of the thin portion E. , The light beam of the light projecting means 41 installed on one side across the bent portion bent at a right angle of the thin portion E is irradiated to the bent portion of the thin portion E, and the thin portion E The irradiation light beam that has passed through the pinhole generated in the bent part of The pinhole is light-transmitted by using the image receiving means 42 (CCD type line sensor or linear type CCD camera) having an optical image receiving field in the linear line direction orthogonal to the conveying movement direction of the placed blank sheet S. By detecting as a point (for example, a light spot image or a light image in which light spots are continuous), the occurrence of pinholes in the blank sheet S is detected.

  As described above, the apparatus according to the present invention receives the irradiation light beam that has passed through the pinhole generated at the folding portion d of the thin portion E as a light spot image or an image that is a light image by the image receiving means 42. In order to detect the occurrence of a pinhole, even if the amount of light transmitted through the pinhole that is bent through the fold d of the thin portion E is very small, it is not detected because it is captured as an image. In other words, it is possible to accurately and efficiently detect the pinhole without overlooking the occurrence of the pinhole.

Further, the apparatus of the present invention receives an image by an image receiving means (CCD line sensor or linear CCD camera) having an optical image receiving field in a linear line direction (transport width direction) orthogonal to the transport movement direction of the blank sheet S. Since the pinhole is detected using the means 42, even when the transport position of the blank sheet S is slightly changed in the transport width direction orthogonal to the transport direction, the pinhole is not detected and the light spot ( Detection as a light image or a light point image), the detection accuracy with respect to the conveyance accuracy of the blank sheet S can be improved, and accurate pinhole detection is possible.

  Further, in the apparatus of the present invention, the image receiving means 42 immediately detects the irradiation light of the light projecting means 41 that has passed through the pinhole generated in the bent portion of the thin portion E as an image, so that the pinhole occurrence detection signal is immediately detected. The blank sheet conveyance unit of the adhesive application unit 30 and the bending unit 60 receives the signal as a stop signal, temporarily stops the conveyance unit based on the signal, and the blank sheet S The conveyance movement can be stopped, and during the stop, the blank sheet S in which the pinhole is generated can be extracted and removed as a defective product, and the stop operation is canceled by the reset means. The conveyance unit is re-conveyed, the blank sheet S is conveyed and moved, and the pinhole detection operation can be resumed.

  The apparatus of the present invention can increase the intensity (illuminance, light quantity) of the light source by using a light source with a small diameter φ of the projected light beam such as a fiber light guide type halogen light source for the light projecting means 41. The diameter of the pinhole generated in the bent portion that is bent through the fold d of the thin portion E is extremely small (for example, about 0. 0 of the minimum diameter that can be visually recognized that light is transmitted). Even if it is about 3 mm to about 0.1 mm), the intensity (illuminance, light quantity) of the transmitted light can be strengthened and captured as an image reliably, so it is not undetected and without overlooking the occurrence of pinholes It can be detected accurately, accurately and efficiently.

  Further, the apparatus of the present invention has a radius in a portion corresponding to the opposed installation of the light projecting means 41 and the image receiving means 42 at the front edge of the guide plate 45 that horizontally guides the horizontal surface of the bent portion in the thin portion E of the blank sheet S. By providing a semicircular light receiving cutout 45a of about 2.5 mm, the light flux diameter φ of the light projected by the light projecting means 41 is 5 mm, and is orthogonal to the conveyance direction of the blank sheet S of the image receiving means 42. When the presence or absence of a pinhole is detected by setting the optical image viewing field width in the transport width direction to about 85 mm, not only the pinhole generated in the portion along the fold line d of the thin portion E, It is possible to detect a pinhole generated in a bent portion in a portion about 2.5 mm apart on both sides of the fold d as a center line, and the intensity of transmitted light after passing through a fine pinhole ( Time, along with increasing the amount of light) in the image detectable sufficient strength, it is possible to expand the pinhole detection region of the bent portion of the thin portion E of a blank sheet S.

  An embodiment of a pinhole inspection apparatus in a skive processing line for a liquid paper container of the present invention will be described in detail below.

  As shown in the side view of FIG. 1 (a) and the plan view of FIG. 1 (b), the apparatus of the present invention includes a folding means 60 and is used for box making of a cylindrical liquid paper container ( A cutting means 50 (a cutting rotary roller type cutting means and the like will be described later with reference to FIG. 5) along the outer end portion (shaded area) of the sticking plate 5 that becomes the cylindrical end portion of the cylindrical body A of FIG. Thus, a thin portion E having a predetermined width of the blank sheet S formed in advance by skiving (cutting) is folded 180 ° from a flat state (see FIG. 7A) through a right angle state (FIG. 7 ( b) (see FIG. 5), and a folding means 60 that folds back to the center of the thin portion E. The blank sheet S is folded at a right angle by a folding plate (described later in FIG. 5). Are sequentially conveyed in a horizontal direction linearly one by one.

The bending means 60 is provided with a horizontal conveyance table portion for horizontally placing the blank sheet S, and a conveyance roller portion for conveying the blank sheet S on the horizontal conveyance table portion, and the conveyance roller portion is opposed vertically. The blank sheet S is linearly conveyed by a plurality of pairs of rollers. Note that the blank sheet conveying method of the bending means 60 is not particularly limited in the present invention. For example, in addition to the conveying roller method described above, for example, a feeding claw that feeds and conveys the rear end portion of the blank sheet S May be a pushing claw method or the like attached at equal intervals to an endless chain that performs intermittent transfer.

  As shown in FIG. 1 (a), a pinhole detection means 40 is installed in the linear conveyance path of the blank sheet S, and the pinhole detection means 40 is a fold of the thin portion E of the blank sheet S. The light projecting means 41, which is fixedly fixed at a fixed position, is vertically opposed to the upper and lower sides of the sheet S across a bent portion bent at a right angle by d, and perpendicular to the conveyance movement direction of the blank sheet S. An image receiving means 42 such as a CCD line sensor or a linear CCD camera having an optical image receiving field (detection field) in a straight line direction is provided. An obstacle that blocks light is provided between the light projecting means 41 and the image receiving means 42. There is no state.

  As shown in FIG. 1 (a), the optical axes O of the light projecting means 41 and the image receiving means 42 coincide with each other and pass at least through the fold d of the bent portion bent at a right angle of the thin portion E. In addition, the optical axis angle θ of the light projecting means 41 (the angle of the thin portion E with respect to the horizontal plane) is not particularly limited in the present invention, but for example, 30 ° to 60 °. A degree of 45 ° is appropriate. Note that the optical axis O of the image receiving means 42 such as a CCD line sensor or a linear CCD camera having an optical image receiving field in the straight line direction is a sensor at the center of a plurality of sensors arranged in the straight line direction of the means 42. The optical axis passes through the center of the optical axis, and the optical axis of the condensing lens system disposed on the sensor front surface of the means 42.

  One of the light projecting means 41 and the image receiving means 42 by the linear CCD camera that are installed opposite to each other across a bent portion that is bent at a substantially right angle by the fold d of the thin portion E of the blank sheet S. The light means 41 narrows down the diameter of the projected light beam as much as possible. For example, the diameter φ of the projected light beam is set to 5 mm, and the width f of the optical image field of the other image receiving means 42 is set to 85 mm. Yes.

  The light projecting means 41 irradiates a detection light beam toward a bent portion bent at a right angle of the thin part E of the blank sheet S being conveyed at a fixed position, and the image receiving means 42 is at a fixed position. With a linear CCD camera, the transmitted light that has passed through the pinhole generated in the bent portion of the thin portion E is detected as an image, and the occurrence of the pinhole in the bent portion is detected.

  The pinhole inspection apparatus in the skive processing line of the liquid paper container of the present invention can be installed separately from the adhesive application means 30 and the cutting means 50 for forming the thin portion E on the blank sheet S. However, if necessary, the adhesive applying means 30 and the bending means 60 are installed in-line after the cutting means 50 so that the thin portion E can be cut and pinhole-inspected in-line. It may be.

  The image receiving means 42 of the pinhole inspection apparatus in the skive processing line of the liquid paper container of the present invention is a light projecting means that has passed through the pinhole generated in the bent portion of the thin portion E of the blank sheet S being transported. When the irradiation light beam 41 is detected as an image, a pinhole occurrence detection signal is immediately transmitted.

  And the conveyance part of the bending means 60 which is conveying the said blank sheet S can receive the pinhole generation | occurrence | production detection signal from the image receiving means 42 as a stop signal once.

  Then, the conveying section of the bending means 60 temporarily stops based on the stop signal to stop the conveyance movement of the blank sheet S, and during the stop, the blank sheet in which the pinhole is generated S is extracted and removed.

  Then, the conveyance unit of the bending unit 60 that is stopped is released from the stop operation by the reset unit (reset button operation), starts the re-conveying operation, conveys and moves the blank sheet S, and detects the pinhole. Let it resume.

  At least the installation position of the light projecting means 41 and the image receiving means 42 and the front and rear positions thereof in the conveyance path of the thin portion E of the blank sheet S conveyed linearly by the bending means 60 are shown in FIG. ), A plan view of FIG. 2B, and a partial perspective view of FIGS. 3A to 3B, the thin portion of the blank sheet S conveyed linearly by the bending means 60 The guide plate 45 that horizontally guides the horizontal surface of the bent portion at E and the guide plate 46 that guides the vertical surface in the vertical direction do not block the light path by the optical axis O of the light projecting means 41 and the image receiving means 42. Thus, it is installed with a predetermined interval w.

  As shown in FIGS. 3A to 3B, the front edge of the guide plate 45 is linearly formed parallel to the linear conveyance direction of the blank sheet S, and FIG. As shown in (b), a part of the front end edge has a semicircle having a radius of about 2.5 mm in a portion corresponding to the optical path by the optical axis O of the light projecting means 41 and the image receiving means 42 disposed opposite to each other. A light receiving cutout 45a may be provided.

  As shown in FIG. 5 (a), a skive processing device 50 (cutting device) is connected to the preceding stage of the adhesive application device 30 of the pinhole inspection device of the present invention, and the pin of the skive processing line is online. Hall inspection can be performed.

  As shown in FIG. 5 (a), the skive (cutting) processing device 50 includes, for example, a plurality of upper and lower conveying rolls 51 and 51 (conveying unit), and an upper and lower opposing pressing roll 52 and cutting roll 53 ( The roll peripheral surface is provided with a fine uneven cutting surface), and the blank sheet S is introduced between the opposed conveying rolls 51 and 51 (conveying unit) and conveyed forward, By introducing between the cutting rolls 53, the back surface of the outer end portion (shaded area shown in FIG. 6) of the sticking plate 5 formed on one end portion of the blank sheet S is blanked by the transport rolls 51 and 51 (transport portion). The thin portion E is formed by cutting by the rotation of the cutting roll 53 that rotates in the same direction as the conveying direction at a higher speed than the conveying speed of the sheet S.

  As shown in FIG. 5A, the folding device 60 (bending means) is formed in advance by a skive (cutting) process while conveying the blank sheets S one by one linearly in the horizontal direction in the conveying unit. Further, the thin part E having a predetermined width of the blank sheet S was folded 180 ° through a fold line d passing through the center of the thin part E from a flat state (see FIG. 7A) through a right angle state. It is folded back to the state (see FIG. 7B), and a right-angle folding means 60A provided with a folding guide plate 62 that bends the thin portion E at a right angle at a fold line d, and a U character at a fold line d. Folding means 60B provided with a folding guide plate 64 that is folded back into a shape. In this way, the blank sheets S are folded and conveyed one by one in a straight line in the horizontal direction.

  The right-angle folding means 60 </ b> A includes a plurality of pairs of upper and lower conveying rolls 61, 61 (conveying unit), and a thin portion E provided on one side with respect to the conveying direction and formed on the sticking plate 5 of the blank sheet S. 1 and a folding plate 62 that bends at a right angle at a crease d, and the thin portion E of the blank sheet S is folded at a right angle on the slope 63 of the folding plate 62 as shown in FIG. It is.

The folding means 60B includes a plurality of pairs of upper and lower conveying rolls 61 and 61 (conveying unit) and a thin portion E of the blank sheet S that is provided on one side with respect to the conveying direction and is bent substantially at a right angle. And a folding plate 64 for folding the thin portion E inwardly at the crease d and folding the thin portion E, and the thin portion E of the blank sheet S is inward along the slope of the folding plate 64 And folded back flatly as shown in FIG. 7 (b).

  As shown in FIG. 5A, the conveyance path of the conveyance introduction portion of the blank sheet S after the right-angle folding along the fold line d by the right-angle folding means 60A constituting the bending means 60 of the apparatus of the present invention is The first photosensor (PHs1), the pinhole detection means 40, and the second photosensor (PHs2) are installed. The first photosensor (PHs1) and the second photosensor (PHs2) are either a transmitted light detection method having a light projecting part and a light receiving part on the front and back sides of the blank sheet S, or the front and back sides of the blank sheet S, respectively. Any of the reflected light detection methods including a light projecting unit and a light receiving unit on one side may be used.

  As shown in FIG. 5A, the pinhole detection means 40 has an optical axis O of the detection means that coincides with the detection line O in the conveyance path after being folded at right angles by the right angle folding means 60 </ b> A in the bending means 60. It is installed as follows.

  Further, as shown in FIG. 5A, the first photosensor (PHs1) has a sensor optical axis of the detection line O in the conveyance path after being folded at right angles by the right angle folding means 60A in the bending means 60. As shown in FIG. 5A, the second photosensor (PHs2) is installed so as to coincide with the immediately preceding sensor installation line O1, and the optical axis of the sensor is formed by the right-angle folding means 60A in the folding means 60. It is installed so as to coincide with the sensor installation line O2 immediately after the detection line O in the conveyance path after being folded at a right angle.

  The separation distances L1 and L2 between the detection line O on which the pinhole detection means 40 is installed and the sensor installation lines O1 and O2, respectively, are the front end in the conveyance direction of the blank sheet S to be detected by the pinhole detection means 40 and In order to prevent the occurrence of undetected rear end portions, it is desirable that they are as close as possible, but for example, about 1 mm to 7.5 mm, or about 1 mm to 10 mm is appropriate.

  The inspection operation by the apparatus of the present invention will be described below based on the block diagram of the pinhole inspection apparatus shown in FIGS. 5A and 5B. The adhesive application means 30 (the application roll 31 and the pressure roll 32 are preliminarily described. The blank sheet S in which the adhesive is applied to the skive surface (cut surface) of the thin portion E of the blank sheet S by the application roll 31 or the adhesive application nozzle portion (not shown) of the adhesive supply tank 33)) is folded. When the front end of the blank sheet S reaches the first photosensor (PHs1) after being introduced into the bending means 60 and conveyed by the conveying section of the bending means 60, the first photosensor (PHs1) detects the front end of the blank sheet S body, and the first signal for starting sheet introduction is a sequencer 70 (a CPU or personal computer equipped with a sequencer or sequence program). Originating in Yuta, etc.).

  Subsequently, in the blank sheet S that continues to move, the thin-walled portion E formed on the sticking plate 5 at one end thereof is a right-angle folding means 60A in the folding means 60 along the fold line d at the center. The bent portion 62 is bent at a right angle while passing through the inclined surface 63 of the bent plate 62, and a bent portion is formed in the thin portion E.

  Subsequently, when the front end portion of the blank sheet S reaches the second photosensor (PHs2) at the rear stage, the second photosensor (PHs2) detects the front end portion of the blank sheet S, and starts the sheet introduction. Two signals are continuously transmitted to the sequencer 70 that has already received the first signal for starting sheet introduction, and the bent portion (fold d) of the thin portion E bent at a right angle is a pinhole detecting means. 40 is reached.

That is, in the case where the first photosensor (PHs1) and the second photosensor (PHs2) are, for example, a transmitted light detection system having a light projecting portion and a light receiving portion on both front and back sides of the blank sheet S, the blank sheet When the front end of S reaches the first photosensor (PHs1) and the second photosensor (PHs2), respectively, the first photosensor (PHs1) and the second photosensor (PHs2) emit light respectively. The detection light from the light receiving portion to the light receiving portion is shielded by the sheet S, and each light receiving portion does not receive the detection light from the light projecting portion and transmits a non-detection signal 0 and a NOT circuit (0 [=] 1, 1 [=] 0), the detection signal 1 for detecting the sheet front end portion of the blank sheet S main body is transmitted to the AND circuit as a sheet introduction start first signal and a sheet introduction start second signal, respectively. 1 × 1 = 1 It transmits a signal (detection signal 1). While both the first photosensor (PHs1) and the second photosensor (PHs2) are not detecting the blank sheet S, the first photosensor (PHs1) and the second photosensor (PHs1) The photosensors (PHs2) of the photosensors (PHs2) detect the detection light from the light projecting parts, respectively, and send the detection signal 1 and the non-detection signal 0 is ANDed via the NOT circuit (1 [=] 0). The AND circuit transmits a signal of 0 × 0 = 0 (non-detection signal 0).

  Alternatively, when the first photosensor (PHs1) and the second photosensor (PHs2) are of a transmitted light detection system, the front end portion of the blank sheet S is respectively connected to the first photosensor (PHs1) and the first photosensor (PHs1). When the light reaches the second photosensor (PHs2), the detection light from the light projecting portion to the light receiving portion of each of the first photosensor (PHs1) and the second photosensor (PHs2) is blocked by the sheet S. The light receiving unit does not receive the detection light from the light projecting unit, transmits a non-detection signal 0, and the non-detection signal 0 which detects the sheet front end portion of the blank sheet S main body is a sheet introduction start first signal and a sheet, respectively. The signal is transmitted to the NAND circuit as the introduction start second signal, and the NAND circuit transmits a signal of 0 × 0 [=] 1 (detection signal 1). While both the first photosensor (PHs1) and the second photosensor (PHs2) are not detecting the blank sheet S, the first photosensor (PHs1) and the second photosensor (PHs1) Of the photosensors (PHs2) of the photosensors (PHs2), the light receiving sections detect the detection lights, transmit detection signals 1 and transmit them to the NAND circuit, and the NAND circuit outputs a signal of 1 × 1 [=] 0 ( A non-detection signal 0) is transmitted.

  In the case where the first photosensor (PHs1) and the second photosensor (PHs2) are of a reflected light detection system provided with a light projecting portion and a light receiving portion on either the front or back side of the blank sheet S, for example. When the front end of the blank sheet S reaches the first photosensor (PHs1) and the second photosensor (PHs2), respectively, the first photosensor (PHs1) and the second photosensor (PHs2) The detection light from the respective light projecting parts is reflected by the sheet S surface, the light receiving parts receive the reflected light, and the detection signal 1 for detecting the sheet front end part of the blank sheet S main body is the start of sheet introduction. 1 signal and a sheet introduction start second signal are transmitted to the AND circuit, and the AND circuit transmits a signal of 1 × 1 = 1 (detection signal 1). While both the first photosensor (PHs1) and the second photosensor (PHs2) are not detecting the blank sheet S, the first photosensor (PHs1) and the second photosensor (PHs1) The detection light from each light projecting part of the photosensor (PHs2) is not reflected by the sheet S surface, each light receiving part does not receive the reflected light, a non-detection signal 0 is transmitted to the AND circuit, A signal of 0 × 0 = 0 (non-detection signal 0) is transmitted.

  When the sequencer 70 continuously receives both the first signal and the second signal of the sheet introduction start, the AND circuit of the sequencer 70 is turned on by both the first signal and the second signal. Thus, an inspection start operation signal is transmitted to the light projecting means 41 and the image receiving means 42 of the pinhole detecting means 40, the light projecting means 41 starts irradiation of the inspection light, and the image receiving means 42 receives the image receiving operation (or Start image receiving operation and video recording operation).

The thin portion E of the blank sheet S that has reached the pinhole detecting means 40 is introduced between the light projecting means 41 and the image receiving means 42 of the pinhole detecting means 40, and the image receiving means 42 is thinly transported. When the bent portion of the portion E is received as an image (moving image) along the bent portion, and a pinhole is generated in the thin portion E, the bent portion E is displayed as an image (for example, a point-like light image). As an image.

  The received image is immediately transmitted from the image receiving means 42 to the sequencer 70, and the image received by the inspection sequence processing program is scanned, and the contrast value of the image is measured and calculated, and collation analysis ( The presence / absence of a pinhole is detected by comparing with and analyzing the pinhole occurrence threshold. The detection result is temporarily stored in the sequencer 70.

  Subsequently, when the rear end of the blank sheet S continuously conveyed by the conveying unit of the bending means 60 passes through the first photosensor (PHs2) in the preceding stage, the first photosensor (PHs1) The continuous transmission of the first signal for starting sheet introduction of S is stopped, and only the second signal for starting sheet introduction detected and transmitted by the second photosensor (PHs2) at the subsequent stage is continuously transmitted, The AND circuit of the sequencer 70 is turned off by the signal, and the sequencer 70 transmits an inspection end signal notifying the end of the pinhole inspection of the blank sheet S and the end of the detection sequence processing, and the light projecting means 41 emits the inspection light. The image receiving means 42 stops the image receiving operation (or the image receiving operation and the video recording operation).

  The sequencer 70 immediately sends the inspection end signal to the cutting means 50, the adhesive application means 30, and the bending means 60 that are connected in-line when the detection result indicates that a pinhole is generated. A transport stop command signal is transmitted to temporarily stop the transport portions of the respective means 50, 30, 60. When the detection result indicates that no pinhole is generated, the respective transport means 50, 30, 60 are continuously transported. The blank sheet S folded at right angles is introduced into the overfolding means 60B, and the thin portion E is folded flat as shown in FIG. A blank sheet S with edge protection applied to the outer end portion of the portion 5 is formed and carried out.

  The input of data such as inspection condition setting data to the sequencer 70 and the output of detected image data and inspection result data from the sequencer 70 are input / output means 80 (input keyboard (mouse), etc.). Device, output device such as a display screen or a printer).

  When the conveying portions of the respective means 50, 30, 60 are temporarily stopped, the nip pressures of the plurality of opposed conveying rollers 61, 61 (conveying portions) of the bending means 60 are released, and the pinhole The generated blank sheet S is extracted from the bending means 60 and removed. Further, in the case of the feeding claw method, the blank sheet S in which pinholes are generated is extracted and removed from between the feeding claws.

(A) is the partial side view explaining an example of the pinhole inspection apparatus in the skive processing line of the liquid paper container of this invention, (b) is the partial top view. (A) is the partial side view explaining the other example of the pinhole inspection apparatus in the skive processing line of the liquid paper container of this invention, (b) is the partial top view. (A)-(b) is a perspective view explaining an example of the guide plate used for the pinhole inspection apparatus in the skive processing line of the liquid paper container of this invention. (A)-(b) is a perspective view explaining the other example of the guide plate used for the pinhole inspection apparatus in the skive processing line of the liquid paper container of this invention. (A) is the whole side view of the pinhole inspection apparatus in the skive processing line of the liquid paper container of this invention, (b) is the block diagram of the apparatus. The expanded view explaining the blank sheet | seat of a common liquid paper container. (A)-(b) is a side cross section explaining edge protection of the blank sheet | seat of a common liquid paper container. (A) is a whole perspective view explaining a general liquid paper container, (b) is a schematic side view explaining its hermetic seal.

Explanation of symbols

S ... Blank sheet E ... Thin part d ... Thin part crease 5 ... Sticking plate
DESCRIPTION OF SYMBOLS 30 ... Adhesive application means 40 ... Pinhole detection means 41 ... Light projection means
42 ... Image receiving means 45 ... Horizontal guide plate 46 ... Vertical guide plate
DESCRIPTION OF SYMBOLS 50 ... Cutting means 51 ... Conveying part 53 ... Cutting roll 60 ... Bending means 60A ... Right angle folding means 60B ... Folding means 61 ... Conveying part 62 ... Right angle bending guide plate 63 ... Inclined surface 64 ... Folding guide plate 70 ... Sequencer 80 ... Input / output means
PHs1 ... 1st photo sensor PHs2 ... 2nd photo sensor

Claims (8)

  Adhered to a thin portion E formed by skiving to a predetermined width along the outer end portion of the sticking plate 5 which is a cylindrical end portion of the blank sheet S used for making a transporting and moving cylindrical liquid paper container. An adhesive application means 30 for applying an agent; a folding means 60 for folding the thin portion E 180 degrees from a flat state at a fold d passing through the center thereof; and the thin portion E in the middle of folding by the folding means 60 The light projecting means 41 installed on the sheet S so as to be spaced apart from each other and sandwiching the right-angle bent portion bent at a substantially right angle at the fold line d, and the straight line direction perpendicular to the conveyance movement direction of the blank sheet S And a pinhole detecting means 40 including an image receiving means 42 having a shaped optical image receiving field, and a light projecting means 41 that transmits a pinhole generated in a bent portion of the thin portion E of the blank sheet S that is conveyed and moved. Before irradiating light Image receiving means 42 pinhole inspection apparatus according skived lines of the liquid feed container, characterized in that so as to detect the occurrence of pinholes by detecting and receiving an image by.   The pinhole inspection apparatus in the skive processing line of the liquid paper container of Claim 1 WHEREIN: The cylindrical edge part of the blank sheet S used for box making of a cylindrical liquid paper container in the front | former stage of the said adhesive application means 30; A pinhole inspection device in a skiving line of a liquid paper container, comprising a cutting means 50 for skiving to a predetermined width along the outer end of the sticking plate 5 to form a thin portion E. 3. The pinhole inspection apparatus in a skive processing line for a liquid paper container according to claim 1 or 2, wherein the image receiving means 42 of the pinhole detection means 40 is a projection through which a pinhole generated in a bent portion of the thin portion E is transmitted. By detecting the irradiation light beam of the light means 41 as an image, a pinhole occurrence detection signal is immediately transmitted, and the transporting units 51 and 61 receive it as a stop signal, and based on the signal, the transporting units 51 and 61 Is temporarily stopped to stop the conveyance of the blank sheet S, and while the sheet is stopped, the blank sheet S in which pinholes are generated is extracted and removed, and the stop unit is released by the reset means, thereby the conveyance unit 51 and 61 is re-conveyed operated by liquid feeding, characterized in that so as to resume the detection of pinholes by conveying movement blank sheet S Vessel pinhole inspection apparatus according skived lines.   4. A pinhole inspection apparatus for a skiving line for a liquid paper container according to any one of claims 1 to 3, wherein the image receiving means 42 of the pinhole detection means 40 is a CCD line sensor or a linear CCD camera. Pinhole inspection device for liquid paper container skive processing line.   5. The pinhole inspection device in a skive processing line for a liquid paper container according to claim 1, wherein the light projecting means 41 of the pinhole detecting means 40 is a fiber light guide type halogen light source. Pinhole inspection device in skive processing line for liquid paper containers.   6. The pinhole inspection device in a skive processing line for a liquid paper container according to claim 1, wherein a light projection beam diameter φ of a light projection means 41 of the pinhole detection means 40 is 5 mm, and the image A pinhole inspection apparatus in a skive processing line of a liquid paper container, wherein the line-shaped optical image receiving field width f of the image receiving means is 85 mm. 7. A pinhole inspection apparatus in a skive processing line for a liquid paper container according to any one of claims 1 to 6, wherein the thinned portion E is bent at a right angle of the blank sheet S conveyed linearly by the bending means 60. In the thin portion E of the blank sheet S that is linearly conveyed to at least the installation position of the light projection means 41 and the image receiving means 42 of the pinhole detection means 40 and the front and rear positions thereof in the conveyance path of the bent portion of A pinhole inspection in a skiving line of a liquid paper container, characterized in that a guide plate 45 that horizontally guides a horizontal plane of the bent portion and a guide plate 46 that vertically guides a vertical plane are arranged at a predetermined interval from each other. apparatus.   8. A pinhole inspection device in a skive processing line for a liquid paper container according to claim 7, wherein the pinhole detecting means 40 at the front end edge of the guide plate 45 that horizontally guides the horizontal surface of the bent portion in the thin portion E of the blank sheet S. A half of a 2.5 mm radius for expanding a substantially linear optical image receiving field in a straight line direction perpendicular to the conveyance movement direction of the blank sheet S is provided in a portion corresponding to the opposing installation of the light projecting unit 41 and the image receiving unit 42. A pinhole inspection apparatus in a skive processing line for a liquid paper container, wherein a circular light receiving cutout 45a is provided.

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