JP2005227238A - Pinhole inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pinhole inspection device capable of detecting highly accurately a pinhole defect generated when manufacturing a folding sheet for folding granule or the like in a high temperature state. <P>SOLUTION: A thermocompression bonding roller 21 is provided on a medicine filling part 2 of a folding sheet manufacturing device 1, and heat is applied to a pinhole detection device 30 positioned near the medicine filling part 2. A reflection plate 44 is provided on a light-receiving side optical path 35 in the pinhole detection device 30. The reflection plate 44 is connected to the first radiator 45 and prevents heat transfer to a light detection element 36. The light detection element 36 is covered by the second radiator 46 and releases the heat applied to the light detection element 36. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pinhole inspection apparatus, and more particularly to a pinhole inspection apparatus suitable for use in an inspection apparatus that detects a pinhole generated in a sheet when particles such as drugs are packaged in the sheet.

  Generally, chemicals such as powder, fine particles, granules (hereinafter referred to as “particles”) are packaged in a predetermined amount in a packing sheet and sold. A plurality of packaging sheets in which such chemicals are packaged are manufactured simultaneously with the chemicals being charged. The manufacturing method of this wrapping sheet will be described. First, the front sheet material and the back sheet material are sandwiched between the heat press rollers, and the pocket portion is formed by pressing the lower side of the pocket forming portion and the three sides on both sides thereof. . After putting a predetermined amount of medicine into this pocket part, the upper part of the pocket part is pressed by a hot press roller to form a packaging sheet. Thereafter, an operation such as perforation with a perforation cutter is appropriately performed.

  In manufacturing such a wrapping sheet, when a pocket portion is formed or when a drug is put in, the drug enters the portion of the sheet where heat-pressing is performed, causing a pinhole defect. May end up. When such a pinhole defect occurs, the commercial value is remarkably lowered. Therefore, it is required to reliably detect the pinhole defect. As a device for detecting a pinhole, there is a bite inspection device disclosed in Japanese Patent Laid-Open No. 3-85206. This biting inspection device detects the presence or absence of biting based on the light projected from the infrared projector and transmitted through the packaging sheet.

There is also a biting determination device disclosed in Japanese Patent Laid-Open No. 9-183422. This biting determination device captures a sheet surface with a CCD image sensor and performs biting determination by threshold processing of the obtained image signal.
JP-A-3-85206 JP-A-9-183422

  However, in the bite inspection device disclosed in Patent Document 1, pinholes are detected based on light transmitted through the packaging sheet. For this reason, the packaging sheet must be transparent and translucent, and pinhole detection cannot be performed for an opaque packaging sheet.

  The biting determination device disclosed in Patent Document 2 uses a CCD image sensor. For this reason, for example, when a pattern is applied to the seal portion of the packaging sheet and the shape thereof is complicated, the pinhole detection accuracy is low. Furthermore, the degree of reflection of light from the light source is further reduced. There is a problem that adjustment takes time, such as adjustment of the focal length of the lens.

  On the other hand, when manufacturing such a wrapping sheet or the like, a hot press roller or the like is used, so that the surroundings are in a high temperature state. Under such high temperature conditions, there is also a problem that the selection of the pinhole detection device is restricted.

  Therefore, an object of the present invention is to provide a pinhole inspection apparatus capable of detecting pinhole defects with high accuracy when producing a packaging sheet for packaging granules such as drugs under high temperature conditions. There is to do.

  The pinhole inspection apparatus according to the present invention that has solved the above-described problems is a non-transparent component manufactured by forming a pocket portion by pressing a plurality of sheets with a hot press roller, and encapsulating a package in the pocket portion. In the pinhole inspection device for inspecting the presence or absence of pinhole defects in the packaging sheet, a pinhole detection device is provided on the downstream side of the heat pressure roller with respect to the flow direction of the packaging sheet. And an optical detection element, the light source and the optical detection element are optically connected via an optical path, and transmission is possible when an XYZ orthogonal coordinate system in which the optical path is arranged along the Z axis is set. The first optical means for limiting the incident angle of light in the XZ plane and the second optical means for limiting the incident angle of light in the YZ plane that can be optically coupled to the photodetecting element are the object to be measured and the light. Between the optical path to the sensing element , Which are sequentially arranged along the Z axis, are provided with a heat shielding means for shielding heat to the light detecting element, and the light that has passed through the pinhole of the packaging sheet by irradiating the packaging sheet in the optical path with light from the light source Is detected by a photodetection element to inspect for the presence of pinhole defects.

  In the pinhole inspection apparatus according to the present invention, when the light irradiated from the light source passes through the pinhole formed in the packaging sheet, the light is irradiated along the Z direction. At this time, since the traveling direction of the noise light other than the light transmitted through the pinhole is inclined with respect to the Z axis, the coupling of the noise light to the light detection element is limited by the first and second optical means. For this reason, this detector does not necessarily require a strict closed space between the object to be measured and the detector at the time of detection, and can easily detect a pinhole. Therefore, by using this pinhole inspection apparatus, it is possible to detect with high accuracy pinhole defects that occur when manufacturing a packaging sheet for packaging granules such as drugs.

  By the way, the pinhole detection device is used in a relatively high heat environment in the vicinity of a hot-pressing roller or the like. However, when this pinhole detection device is used under a high temperature condition, the detection accuracy is lowered, or the light detection element. There is a problem that the deterioration of the In this regard, the pinhole inspection apparatus according to the present invention is provided with a heat shielding means for shielding heat to the light detection element. For this reason, since the heat resistance with respect to a photon detection element can be improved, degradation of a photon detection element etc., a fall of detection accuracy, etc. can be prevented.

  Here, it is preferable to use a photomultiplier tube as the photodetecting element. By using a photomultiplier tube, light that has passed through the pinhole can be detected with high accuracy, and the pinhole detection accuracy can be increased. Moreover, the photomultiplier tube which is not high in heat resistance can be suitably protected from heat.

  In addition, a first radiator that radiates heat of the optical path and a second radiator that radiates heat to the light detection element are provided, and a heat insulating material is interposed between the first radiator and the second radiator. It can also be set as an aspect.

  In addition to the heat directly applied from the heat source, the light detecting element is supplied with heat transmitted through the optical path. The heat from the heat source is radiated by the second radiator, and the heat through the optical path is radiated from the first radiator and interposed with a heat insulating material so that it does not communicate with the second radiator. Yes. For this reason, since the heat given to a photon detection element can be decreased, a photon detection element can be protected from heat more suitably.

  Furthermore, a perforation cutter for attaching a perforation to the packaging sheet is provided on the downstream side in the conveying direction of the packaging sheet in the heat pressure roller, and the optical path is arranged on the heat pressure roller side of the perforation cutter. It can also be done.

  This type of packaging sheet may be perforated so that it can be easily separated when used one by one. After such a perforation is applied, pinhole detection becomes difficult. Therefore, it is preferable to dispose the pinhole detection device closer to the heat pressure roller than the perforation cutter with a perforation. In addition, close contact with the heat pressure roller will greatly receive heat from the heat pressure roller, but by providing a heat shielding means, the light detection element and the like can be suitably protected from heat. Can do.

  It can also be set as the aspect whose light irradiated from a light source is light which has red or an infrared wavelength.

  Causes of pinholes in the packaging sheet include scratches on the pressure roller, adhering dust, holes caused by overheating, and holes present in the aluminum foil of the laminate film itself. Etc. often bite into the heat-sealed part and break the packaging sheet. Therefore, it is conceivable that such powder remains in the place where the pinhole is generated, and the powder blocks the pinhole so that the pinhole cannot be detected. In this regard, by using light having a red or infrared wavelength as light emitted from the light source, this light passes through the powder, so that pinholes can be detected with high accuracy.

  Furthermore, it can be set as the aspect whose to-be-packaged object is a granule. Since the possibility that a pinhole defect will arise when the to-be-packaged object is a granule becomes high, this pinhole test | inspection apparatus can be used suitably. Here, the “granule” referred to in the present invention includes powders, granules, granules and the like used for medicines.

  On the other hand, the present invention that has solved the above problems is a pinhole inspection apparatus that inspects for the presence or absence of pinhole defects in an opaque laminated sheet produced by melt lamination or heat fusion lamination. A pinhole detection device is provided on the downstream side of the heat pressure roller. The pinhole detection device includes a light source and a light detection element, and the light source and the light detection element are optically connected via an optical path. When an XYZ orthogonal coordinate system in which the optical path is arranged along the Z axis is set, the first optical means for limiting the incident angle of light in the transmissive XZ plane can be optically coupled to the light detection element Second optical means for limiting the incident angle of light in the YZ plane is sequentially arranged along the Z axis between the optical path between the object to be measured and the light detection element, and shields heat from the light detection element. Heat shielding hand The opaque laminated sheet in the optical path is irradiated with light from the light source, and the light passing through the pinhole of the opaque laminated sheet is detected by the light detecting element, thereby inspecting the presence or absence of the pinhole defect. .

  As described above, since the heat resistance of the light detection element can be improved even in the pinhole defect apparatus for inspecting the presence or absence of the pinhole defect in the opaque laminated sheet manufactured by melt lamination or heat fusion lamination, the light detection element It is possible to prevent degradation such as deterioration of detection accuracy and the like.

  According to the present invention, there is provided a pinhole inspection apparatus capable of detecting pinhole defects generated when manufacturing a packaging sheet for packaging a powder such as a drug under high temperature conditions with high accuracy. Can do.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a schematic configuration diagram of a side view of a packaging sheet manufacturing apparatus provided with a pinhole inspection apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of a main part of the packaging sheet manufacturing apparatus.

  As shown in FIG. 1 and FIG. 2, the packaging sheet manufacturing apparatus M according to the present embodiment includes a sheet conveyance unit 1, a medicine filling unit 2, a pinhole inspection unit (pinhole inspection device) 3, a cutting unit 4, and An unloading unit 5 is provided.

  The sheet conveying unit 1 includes a first conveying roller 11 and a second conveying roller 12. The first transport roller 11 changes the transport direction of the front sheet film 13 sent out from the film delivery device and feeds it in the direction of the medicine filling unit 2. Further, the second transport roller 12 changes the transport direction of the back sheet film 14 sent out from the film delivery device, and feeds it in the direction of the medicine filling unit 2. As these sheet films 13 and 14, an opaque material, for example, a laminate film manufactured by laminating aluminum foil with plastic is used.

  A medicine filling unit 2 is provided below the sheet conveying unit 1. The medicine filling unit 2 is provided with a heat pressing roller 21. The hot press roller 21 includes a first roller 22 and a second roller 23. The first roller 22 and the second roller 23 are set to a temperature at which they are welded by contacting the sheet films 13 and 14, for example, about 150 ° C.

  When the sheet films 13 and 14 pass between the first roller 22 and the second roller 23, the sheet films 13 and 14 are thermocompression bonded. In the heat pressing roller 21, the lower side and both sides of the sheet film 13, 14 where the pocket portion is formed are heat pressed to form the pocket portion 16. Thereafter, a drug composed of granules is put into the pocket portion, and the upper side of the pocket portion 16 is heat-welded by the heat-pressure-welding roller 21. Further, a portion that is heat-pressed around the pocket portion 16 becomes a seal portion 17. These pocket portion 16 and seal portion 17 constitute a packaging sheet 18.

  Further, a medicine supply nozzle 24 is provided above the hot press roller 21. From the medicine supply nozzle 24, a powdery medicine C is intermittently ejected by a predetermined amount. From the medicine supply nozzle 24, a predetermined amount of medicine C is put into the pocket portion 16 in which the upper side formed by the hot press roller 21 is open. After a predetermined amount of the medicine C is put into the pocket portion 16, the upper side of the pocket portion 16 is hot-pressed by the heat pressure roller 21 to form the seal portion 17.

  A pinhole inspection unit 3 for performing a bite inspection of the packaging sheet 18 is formed at a position near the downstream side in the flow direction of the medicine filling unit 2 and where the packaging sheet 18 is carried out. The pinhole inspection unit 3 is provided with a pinhole detection device 30 serving as a biting inspection device.

  The pinhole detection device 30 includes a light projecting unit 31 and a light receiving unit 32. The light projecting unit 31 is provided with a light source 33 and a light projecting side optical path 34. The light source 33 is a projector that emits red light or infrared light, and the irradiated light is projected onto the light receiving unit 32 through the light projecting side optical path 34.

  On the other hand, the light receiving unit 32 is provided with a light receiving side optical path 35 which is an optical path of the present invention in which one side surface on the light projecting unit 31 side is opened. A light detection element 36 is provided on a surface opposite to the opening surface of the light receiving side optical path, and the light source 33 and the light detection element 36 are optically connected via optical paths 34 and 35. The light projecting side optical path 34 and the light receiving side optical path 35 are arranged along the Z direction when an XYZ orthogonal coordinate system is set as shown in FIG. As the light detection element 36, a photomultiplier tube (PMT) having high sensitivity can be preferably used.

  The packaging sheet 18 carried out from the medicine filling unit 2 is conveyed along the opening end surface of the light receiving side optical path 35, and the light emitted from the light source 33 of the light projecting unit 31 irradiates the packaging sheet 18, In a state where there is no wrapping sheet 18, it is arranged so as to reach the light receiving part 32. A protective glass 37 is provided on the opening end face of the light-receiving side optical path 35.

  FIG. 3 is a partially broken perspective view of a light receiving portion in the pinhole detection device, and FIG. 4 is a side sectional view of the light receiving portion in the pinhole detection device.

  As shown in FIGS. 3 and 4, light control films 38 and 39, which are the first optical means of the present invention, are provided inside the light receiving side optical path 35 in the light receiving unit 32. The light control films 38 and 39 are provided with louvers, and these louvers are arranged such that the longitudinal direction thereof is along the Y direction. The light control films 38 and 39 limit the incident angle in the X direction in the XZ plane. The light control films 38 and 39 are supported by a protective glass 37 and a filter 40, respectively. The protective glass 37 seals the opening of the light receiving side optical path 35 and suppresses the introduction of dust or the like into the light receiving side optical path 35. Further, as the filter 40, a glass plate or a band pass filter that selectively transmits the light emitted from the light source 33 can be used.

  Further, in the light receiving side optical path 35, a condensing lens (cylindrical lens) 41, which is the second optical means of the present invention, and a light receiving region (incident light) that is disposed at the condensing position of the condensing lens 41 is limited. Opening) 42 is formed. In the YX plane, the light incident along the Z axis is condensed on the light receiving region 42 by the condenser lens 41, but the light incident on the condenser lens 41 with a large inclination from the Z axis is incident on the light receiving region 42. Since light is not condensed, the light incident angle in the YZ plane is limited. A photodiode can be used in place of the light receiving region 42.

  The light receiving region 42 in the present embodiment is configured by one end of an optical fiber 43 provided on the light detection element 36 side with respect to the light receiving region 42. The other end of the optical fiber 43 is optically coupled to the light detection element 36. Since the optical fiber 43 can limit the incident light beam diameter and can transmit light to any position, the number of the light detecting elements 36 coupled to the optical fiber 43 is smaller than that in the case where the photodiode is directly arranged. Can be made.

  The light-receiving side optical path 35 and the light detecting element 36 are provided with a reflector 44, a first radiator 45, a second radiator 46, and heat insulating materials 47 and 48, respectively, which are heat shielding means of the present invention. . The reflection plate 44 is disposed so as to cover the light receiving side optical path 35, and prevents heat applied to the light receiving side optical path from entering the light receiving side optical path 35. Further, the inside of the light receiving side optical path 35 is darkened by the reflecting plate 44, and the reflecting plate 44 also functions as a dark box.

  The first radiator 45 is provided at the end of the light receiving side optical path 35 on the side of the light detecting element 36 and mainly plays a role of releasing heat in the light receiving side optical path 35. The first radiator 45 is formed in a state where the reflection plate 44 extends rearward (on the light detection element side), and releases heat from the extended portion. Further, the extending portion is disposed outside the first radiator 45 that covers the light detecting element 36, and heat that moves along the outside of the light receiving side optical path 35 is transmitted to the light detecting element 36. It is preventing.

  Further, the second radiator 46 is provided so as to cover the light detection element 36, and releases heat transmitted from the inside of the light receiving side optical path 35 without passing through the reflector 44 and the first radiator 45. Playing a role.

  The heat insulating materials 47 and 48 are disposed inside the light receiving side optical path 35 and between the first radiator 45 and the second radiator 46, respectively. The heat insulating material 47 provided in the light receiving side optical path 35 protects the light control films 38 and 39, the filter 40 and the like provided in the light receiving side optical path 35 from heat. Moreover, the heat insulating material 48 interposed between the first radiator 45 and the second radiator 46 mainly suppresses the heat radiated from the first radiator 45 from being transmitted to the second radiator 46. doing.

  Furthermore, a space 48A is formed between the reflecting plate 44 and the heat insulating material 48, and cooling air circulates in the space 48A. Since the cooling air is circulated in the space 48 </ b> A, it is possible to effectively cool the light detection element 36 and thermally separate the light detection element 36 and the reflection plate 44.

  On the other hand, a reflecting plate 49 is also provided in the light projecting side optical path 34 in the light projecting unit 31, and heat shielding is performed in the light projecting side optical path 34. Further, the light source 33 is provided with a radiator 50, which releases heat generated from the light source 33 and prevents heat from entering the light source 33.

  A cutting part 4 is formed below the pinhole inspection part 3. The cutting unit 4 is provided with a perforation cutter 51 and a cutting cutter 52. In the perforation cutter 51, perforations are continuously formed between the pocket portions 16 arranged in the width direction of the packaging sheet so that the user can easily separate the packaging sheet 18 for each pocket portion 16. doing. Further, the packaging sheet 18 is provided with a predetermined number of pocket portions 16 in the width direction, for example, the number of pocket portions 16 to be packaged for sale. The cutting cutter 52 cuts the packaging sheet 18 having the number of pocket portions 16 to be enclosed. An unloading unit 5 is provided at a position below the cutting unit 4. The conveyor unit 5 is provided with a conveyor 53, which conveys the packaging sheet 18 cut by the cutting cutter 52 to a position where a post-process is performed.

  The manufacturing procedure of the packaging sheet by the packaging sheet manufacturing apparatus which concerns on this embodiment which has the above structure, and the test procedure of the pinhole defect in the pinhole test | inspection part 3 are demonstrated.

  Production of the packing sheet is performed as follows. First, in the sheet transport unit 1, the two sheet films 13 and 14 are transported to the medicine filling unit 2. In the medicine filling part 2, the two sheet films 13, 14 are brought into heat contact with each other by the heat pressure roller 21 to form the pocket part 16. Thereafter, a predetermined amount of powdery medicine is ejected from the medicine supply nozzle 24 and the pocket medicine 16 is filled with the powdery medicine. When the medicine is filled, the upper side of the pocket portion 16 is hot-pressed to enclose the medicine in the pocket portion 16.

  After the medicine is sealed in the pocket portion 16, the pinhole inspection unit 3 performs a biting inspection on the packaging sheet 18. The biting inspection in the pinhole inspection unit 3 will be described in detail later.

  Then, a perforation is made between the pocket portions 16 in the packaging sheet 18 by the perforation cutter 51. Thereafter, the packaging sheet 18 is cut by the cutting cutter 52 so as to be the number of pocket portions 16 to be boxed at the time of sale, and is conveyed toward the subsequent process by the carry-out portion 5.

  Next, the biting inspection by the pinhole detection device 30 in the pinhole inspection unit 3 will be described.

  In the pinhole detection device 30, the packaging sheet 18 that is thermally pressed is continuously conveyed between the light projecting side optical path 34 and the light receiving side optical path 35. From the light source 33, the packaging sheet 18 is irradiated with red light or infrared light through the light projection side optical path 34. Here, when no pinhole defect is generated in the packaging sheet 18, since the packaging sheet 18 is made of opaque aluminum, light is blocked by the packaging sheet 18, and red light from the light source 33 or Infrared light does not reach the light receiving unit 32.

  Further, when a pinhole defect has occurred in the packaging sheet 18, the light emitted from the light source 33 passes through the pinhole and reaches the light receiving unit 32. In the light receiving unit 32, the light that has passed through the light receiving side optical path 35 reaches the light detecting element 36. The size of the pinhole caused by the pinhole defect can be detected based on the size of the output of the light detection element 36.

  Here, in the light-receiving side optical path 35 in the pinhole detection device 30, light control films 38 and 39, a condensing lens 41, and a light-receiving region 42 that limits the incident light beam diameter are sequentially arranged along the Z-axis. The light control films 38 and 39 limit the incident angle of light in the transmissive XZ plane, and the condenser lens 41 and the light receiving region 42 are in the YZ plane that can be optically coupled to the light detection element 36. The incident angle of light is limited.

  The light that has passed through the pinhole generated in the packaging sheet 18 along the Z-axis direction is coupled to the light detection element 36, but the traveling direction of noise light other than the light that has passed through the pinhole is on the Z-axis. It is leaning against. Therefore, the coupling of noise light to the light detection element 36 is limited by the action of the light control films 38 and 39, the condenser lens 41 and the light receiving region 42. Therefore, when performing pinhole detection, a pinhole can be reliably detected even if a gap or the like is generated in the light receiving side optical path 35 without requiring a closed space. Therefore, pinhole inspection can be performed with high accuracy.

  In the present embodiment, red light or infrared light is used as light emitted from the light source. Since the red light or infrared light passes through the powdery medicine and reaches the light detecting element 36, for example, even if the medicine is buried in the place where the pinhole defect occurs, the accuracy is more accurate. Pinholes can be detected well.

  By the way, if the inspection of the pinhole defect is performed after the perforation is formed, the perforation becomes an opening, and there is a concern that the accuracy of the pinhole inspection is lowered. For this reason, it is preferable that the pinhole detection device 30 is disposed at a position closer to the hot press roller 21 than the perforation cutter 51. As described above, when the pinhole detection device 30 is provided at a position close to the hot press roller 21, the heat problem of the hot press roller 21 occurs.

  Since it is necessary to heat-contact the sheet films 13 and 14 in the heat press roller 21, the temperature is high, for example, about 150 degreeC normally. As described above, when the pinhole detection device 30 is arranged in the vicinity of the hot press roller 21 having a high temperature of about 150 degrees, the pinhole detector 30 is affected by the heat from the hot press roller 21, and the reflection plate 44 has 60. It is about -90 degreeC. In particular, when a photomultiplier tube is used as the photodetecting element 36 provided in the light receiving unit 32 of the pinhole detector 30, the photomultiplier tube has low heat resistance, so that the lifetime of the photomultiplier tube is long. There is a risk of lowering or inducing false detection.

  With respect to this problem, the pinhole detection device 30 according to the present embodiment is provided with a reflection plate 44, radiators 45 and 46, and heat insulating materials 47 and 48 as heat shielding means of the light receiving unit 32. The action of heat shielding by these heat shielding means will be described with reference to FIG. FIG. 5 is a diagram schematically illustrating the heat flow of the light receiving unit in the pinhole detection device.

  As shown in FIG. 5, the heat F <b> 1 from the hot pressing roller 21 is mainly directed to the reflection plate 44 in the light receiving side optical path 35. The heat F <b> 1 is reflected by the reflection plate 44 and is prevented from being transmitted into the light receiving side optical path 35. Even though the light is reflected by the reflecting plate 44, a part of the light enters the light receiving side optical path 35. With respect to such heat, since the heat insulating material 47 is provided in the light receiving side optical path 35, the light control films 38 and 39, the filter 40, the condenser lens 41, provided in the light receiving side optical path 35, Further, deformation of the optical fiber 43 and the like due to heat is prevented.

  A first radiator 45 is connected to the reflection plate 44. A part of the heat F2 other than the heat reflected by the reflecting plate 44 is absorbed by the reflecting plate 44 itself. Here, if a heat insulating material or the like is disposed in the reflecting plate 44 with a cut, the temperature of the light detection element 36 can be reduced, but the inside of the light receiving side optical path 35 cannot be thermally diffused and is stored. Will become even higher temperature. Therefore, the reflecting plate 44 is connected to the first radiator 45. Since the reflection plate 44 is thus connected to the first radiator 45, the heat F <b> 2 absorbed by the reflection plate 44 is released to the outside through the first radiator 45. Since the first radiator 45 is insulated from the second radiator 46 and the light detection element 36, the heat F2 can be prevented from being transmitted to the light detection element 36.

  Further, a slight amount of heat also enters the light receiving side optical path 35. This heat F3 becomes heat F4 that is transmitted in the direction of the light detection element 36 through the light receiving side optical path 35. The photodetecting element 36 is covered with a second radiator 46 against the heat F4. Since the second heat radiator 46 can release the heat F4 transmitted in the direction of the light detection element 36 to the outside, the heat detection for the light detection element 36 can be achieved.

  As described above, in the pinhole detection device 30 according to the present embodiment, heat transfer to the light detection element 36 is suitably prevented by the heat shielding means. Therefore, as a result, it is possible to suitably prevent deterioration of the light detection element 36 and a decrease in detection accuracy due to heat.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the one in which the medicine is enclosed in the packaging sheet is targeted. However, when the powder other than the medicine is enclosed in the packaging sheet, the pinhole inspection apparatus according to the present invention can be used. it can. Moreover, it can use similarly for the packaging sheets other than powder.

  The pinhole inspection apparatus according to the present invention can also be used as a pinhole inspection apparatus that inspects for the presence or absence of pinhole defects in an opaque laminated sheet manufactured by melt lamination or heat fusion lamination. What detects the presence or absence of a pinhole defect in such an opaque laminated sheet will be described with reference to FIG. FIG. 6 is a schematic configuration diagram in a side view of an opaque laminated sheet manufacturing apparatus provided with a pinhole inspection apparatus according to an embodiment of the present invention. In this opaque laminated sheet manufacturing apparatus, an inner core layer is formed inside an outer layer film, and these are formed by heat-sealing.

  As shown in FIG. 6, the opaque laminated sheet manufacturing apparatus 60 according to the present embodiment includes a die 61, and a core layer forming solvent 62 that forms a core layer flows down from the die 61. In addition, a first roll 63 and a pressing roll 64 are provided below the die 61, and the core layer forming solvent 62 is located on or near the pressure contact between the first roll 63 and the pressing roll 64. It is flowing down.

  Furthermore, outer layer films 65 and 65 that form a surface layer are supplied to the pressure contact between the first roll 63 and the pressing roll 64, and the core layer forming solvent 62 is provided between the outer layer films 65 and 65. Is flowing down. The outer layer films 65 and 65 are welded by the sensible heat of the core layer forming solvent 62 that flows down between them.

  Thus, the outer layer films 65, 65 pass between the second roll 66 and the third roll 67 with the core layer forming solvent 62 interposed therebetween. During this time, the core layer forming solvent 62 is cooled and solidified, whereby the outer layer films 65 and 65 are welded to form an opaque laminated sheet 68. The formed opaque sheet 68 passes through the third roll 67 and is wound up by a winding device or the like that is completed and provided separately.

  Further, the pinhole detection device 30 described in the above embodiment is provided in the vicinity of the first roll 63 and the die 61. When a pinhole is generated in the outer layer films 65, 65 by the pinhole detection device 30, the pinhole can be detected. In addition, although the vicinity of the first roll 63 and the die 61 is at a high temperature, the pinhole detection device 30 has a reflection plate 44, radiators 45 and 46, and a heat insulating material 47 as heat shielding means for the light receiving unit 32. , 48 are provided. For this reason, it is possible to suitably prevent the light detection element 36 from being deteriorated due to heat and the detection accuracy from being lowered.

  The pinhole inspection apparatus of the present invention can be used when manufacturing such an opaque laminated sheet by melt lamination or heat fusion lamination. Examples of the melt lamination or heat fusion lamination include an extrusion lamination method and a thermocompression bonding method, and the pinhole inspection apparatus of the present invention can be applied to these methods. In addition to this, for example, one of the outer layer films 65 may be an aluminum film, and polyethylene may be used for the die 61 so that it can be applied to a manufacturing process for manufacturing a general aluminum laminate film.

It is the schematic block diagram which looked at the side of the packaging sheet manufacturing apparatus which provided the pinhole inspection apparatus which concerns on embodiment of this invention. It is a principal part perspective view of the packaging sheet manufacturing apparatus which provided the pinhole inspection apparatus which concerns on embodiment of this invention. It is a partially broken perspective view of the light-receiving part in a pinhole detection apparatus. It is a sectional side view of the light-receiving part in a pinhole detection apparatus. It is a figure which shows typically the heat flow of the light-receiving part in a pinhole detection apparatus. It is the schematic block diagram which looked at the opaque laminated sheet manufacturing apparatus provided with the pinhole inspection apparatus which concerns on embodiment of this invention by the side view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sheet conveyance part, 2 ... Drug filling part, 3 ... Pinhole test | inspection part, 4 ... Cutting part, 5 ... Unloading part, 11 ... First conveyance roller, 12 ... Second conveyance roller, 13 ... Front sheet film, 14 ... Back sheet film, 16 ... Pocket part, 17 ... Seal part, 18 ... Packing sheet, 21 ... Heat-pressing roller, 22 ... First roller, 23 ... Second roller, 24 ... Drug injection nozzle, 30 ... Pinhole detection Device: 31 ... Projection unit, 32 ... Light reception unit, 33 ... Light source, 34 ... Light emission side optical path, 35 ... Light reception side optical path, 36 ... Photodetection element, 37 ... Protective glass, 38, 39 ... Light control film, 40 DESCRIPTION OF SYMBOLS ... Filter, 41 ... Condensing lens, 42 ... Light-receiving area, 43 ... Optical fiber, 44, 49 ... Reflector, 45 ... First heat radiator, 46 ... Second heat radiator, 47, 48 ... Heat insulation material, 50 ... Heat radiation 51, perforation cutter, 52 Cutting cutter, 53 ... conveyer, F1 to F4 ... heat, M ... packing sheet manufacturing apparatus.

Claims (7)

A pinhole inspection device that inspects the presence or absence of pinhole defects in an opaque packaging sheet manufactured by forming a pocket portion by pressing a plurality of sheets with a heat pressure roller and enclosing the packaged material in the pocket portion. In
With respect to the flow direction of the packaging sheet, a pinhole detection device is provided on the downstream side of the heat pressure roller,
The pinhole detection device includes a light source and a light detection element, and the light source and the light detection element are optically connected via an optical path,
When an XYZ orthogonal coordinate system in which the optical path is arranged along the Z axis is set, first optical means for limiting the incident angle of light in the transmissive XZ plane can be optically coupled to the light detection element Second optical means for limiting the incident angle of light in the YZ plane is sequentially disposed along the Z axis between the optical path between the object to be measured and the light detection element,
A heat shielding means for shielding heat to the light detection element is provided;
The package sheet in the optical path is irradiated with light from the light source, and the light detecting element detects the light that has passed through the pinhole of the package sheet, thereby detecting whether or not there is a pinhole defect. Pinhole inspection device.   The pinhole inspection apparatus according to claim 1, wherein a photomultiplier tube is used as the photodetecting element. A first radiator that radiates heat of the optical path, and a second radiator that radiates heat to the light detection element,
The pinhole inspection apparatus according to claim 1 or 2, wherein a heat insulating material is interposed between the first radiator and the second radiator. A perforation cutter for attaching a perforation to the packaging sheet is provided on the downstream side in the conveyance direction of the packaging sheet in the heat pressure roller,
The pinhole inspection apparatus according to any one of claims 1 to 3, wherein the optical path is disposed closer to the hot pressing roller side than the perforation cutter.   The pinhole inspection apparatus according to claim 1, wherein light emitted from the light source is light having a red or infrared wavelength.   The pinhole inspection apparatus according to any one of claims 1 to 5, wherein the package is a granule. In a pinhole inspection apparatus for inspecting the presence or absence of pinhole defects in an opaque laminated sheet produced by melt lamination or heat fusion lamination,
With respect to the flow direction of the opaque laminated sheet, a pinhole detection device is provided on the downstream side of the heat pressure roller,
The pinhole detection device includes a light source and a light detection element, and the light source and the light detection element are optically connected via an optical path,
When an XYZ orthogonal coordinate system in which the optical path is arranged along the Z axis is set, first optical means for limiting the incident angle of light in the transmissive XZ plane can be optically coupled to the light detection element Second optical means for limiting the incident angle of light in the YZ plane is sequentially disposed along the Z axis between the optical path between the object to be measured and the light detection element,
A heat shielding means for shielding heat to the light detection element is provided;
The opaque laminated sheet in the optical path is irradiated with light from the light source, and the light detecting element detects the light that has passed through the pinhole of the opaque laminated sheet, thereby detecting the presence of a pinhole defect. Pinhole inspection device.

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