CN110775374A - Inspection device, PTP packaging machine, and method for manufacturing PTP sheet - Google Patents

Inspection device, PTP packaging machine, and method for manufacturing PTP sheet Download PDF

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Publication number
CN110775374A
CN110775374A CN201910559355.7A CN201910559355A CN110775374A CN 110775374 A CN110775374 A CN 110775374A CN 201910559355 A CN201910559355 A CN 201910559355A CN 110775374 A CN110775374 A CN 110775374A
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China
Prior art keywords
film
imprint
light
container film
inspection
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Granted
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CN201910559355.7A
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Chinese (zh)
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CN110775374B (en
Inventor
田口幸弘
大山刚
坂井田宪彦
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CKD Corp
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CKD Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
    • B65B11/50—Enclosing articles, or quantities of material, by disposing contents between two sheets, e.g. pocketed sheets, and securing their opposed free margins
    • B65B11/52—Enclosing articles, or quantities of material, by disposing contents between two sheets, e.g. pocketed sheets, and securing their opposed free margins one sheet being rendered plastic, e.g. by heating, and forced by fluid pressure, e.g. vacuum, into engagement with the other sheet and contents, e.g. skin-, blister-, or bubble- packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Abstract

The invention provides an inspection device, a PTP packaging machine, and a method for manufacturing a PTP sheet, wherein the inspection device is capable of more suitably inspecting an imprint provided on the PTP sheet, the imprint inspection device (31) includes an illumination device (52) which is capable of projecting light onto a cover film of a PTP film (9) from the outer surface side of the container film over the container film, and an imaging device (53) which is capable of projecting the light over the container film from the outer surface side of the container film and imaging the cover film on which the light is projected, wherein an incident angle (α) of the light projected onto the PTP film (9) with respect to the outer surface of a flat portion of the container film is set to a predetermined large incident angle at which the light reflected from the imprint among the light projected onto the container film is substantially incident on the imaging device (53), and the light reflected from a normal portion of the cover film is substantially not incident on an imaging means (53), and the imprint data is obtained by reflection from the normal portion of the cover film, and the imprint data is displayed brightly, and the inspection data of the imprint is detected.

Description

Inspection device, PTP packaging machine, and method for manufacturing PTP sheet
Technical Field
The present invention relates to an inspection apparatus for performing an inspection related to an imprint provided on a PTP sheet, a PTP packaging machine including the inspection apparatus, and a method of manufacturing the PTP sheet.
Background
In general, PTP (press through pack) sheets are known as blister pack sheets used in the field of pharmaceuticals and the like.
The PTP tablet is composed of a container film in which a bag portion filled with the contents such as a tablet is formed, and a cover film attached to the container film so as to seal the opening side of the bag portion. Generally, the container film is formed of a transparent resin material or the like, and the cover film is formed using an aluminum foil or the like as a base material.
Further, identification information such as a lot number is printed on the cover film side of the PTP sheet (see, for example, patent document 1).
The PTP sheet is manufactured through steps including a bag portion forming step of forming a bag portion on a container film that is transported in a belt shape; a filling step of filling the bag with a content; an attaching step of attaching a cover film to the container film so as to seal the opening side of the bag portion; an imprint step of providing an imprint at a predetermined position of a band-shaped PTP film on which a cover film is attached to a container film; and a step of pressing the PTP film in a band shape in a unit of PTP sheet.
In the imprint step, when the imprint apparatus does not operate properly, for example, even in the case of operation, there is a risk that a PTP piece having an imprint failure such as a defective product in which the imprint cannot be formed properly, a defective product in which the imprint is not formed completely, or a defective product in which the cover film is cut may be generated due to an attachment abnormality of the punch, abrasion of the punch, temperature of the punch, or the like.
In this way, even if some defective condition occurs in the imprinting step and the PTP sheet of the non-defective product cannot be produced, there is a risk that a large amount of defective products will be produced if the worker continues the production without paying attention to the defective condition.
Thus, although not described in patent document 1, it is originally required to perform an inspection relating to the imprint such as the presence or absence of the imprint or the shape state thereof in the process of manufacturing the PTP sheet.
In contrast, there is also a method of performing an inspection involving imprint on a PTP sheet in an on-line manner after the production of the PTP sheet is completed (see, for example, patent document 2).
Documents of the prior art
Patent document
Patent document 1: JP 2002-87413 publication
Patent document 2: JP-A10-129611
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional technique of patent document 2, as shown in fig. 16, the PTP sheet 100 is irradiated with light from the cover film 101 side, and the light reflected from the cover film 101 is imaged by the imaging device 102 to perform the inspection relating to the imprint 103.
More specifically, it is set such that, of the lights L21 and L22 irradiated to the mask film 101, only the light L21 reflected by the exposed surface of the imprint 103 is incident on the imaging device 102, and the light L22 reflected by the normal portion (imprint non-formation region) of the mask film 101 is not incident on the imaging device 102.
That is, in the conventional technique of patent document 2, a configuration is adopted in which light L21 reflected by an exposed surface of the imprint 103 rubbed by a punch of the imprint apparatus directly contacting the mask sheet 101 at the time of forming the imprint 103 is imaged, thereby detecting or inspecting the imprint 103.
As described above, the cover film 101 is formed using an aluminum foil or the like as a base material, and is softer and more easily damaged than a punch or the like of an imprint apparatus. Therefore, the exposed surface of the stamp 103 rubbed by the direct contact of the convex mold may be rough, and light may be strongly scattered.
As a result, the regular reflection component toward the imaging device 102 is weakened by reflection on the exposed surface of the imprint 103, and a certain light amount required for detection or inspection of the imprint 103 cannot be obtained, and for example, if the outline of the imprint 103 is blurred, it is difficult to appropriately detect or inspect the imprint 103.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inspection apparatus and a PTP packaging machine that can more suitably perform inspection relating to the imprint provided on the PTP sheet, and a method of manufacturing the PTP sheet.
Means for solving the problems
In the following, each technical means suitable for solving the above-described problems will be described in a stepwise manner. In addition, according to needs, a special action effect is added behind the corresponding technical scheme.
The present invention according to claim 1 relates to an inspection apparatus for manufacturing a PTP sheet in which a predetermined content is received in a pocket portion formed in a translucent container film, a cover film is attached to an inner surface of a flat portion of the container film so as to close the pocket portion, and an imprint is provided at a predetermined position of the cover film attached to the inner surface of the flat portion of the container film, the inspection apparatus including:
an irradiation mechanism for irradiating a predetermined light to the cover film from the outer surface side of the container film across the container film;
an imaging unit that can image the mask film irradiated with the predetermined light by passing over the container film from an outer surface side of the container film;
an image processing unit that processes an image signal output from the imaging unit;
in the irradiation mechanism, an incident angle of the predetermined light on the outer surface of the flat portion of the container film is set to a predetermined angle at which the light incident on the container film is substantially incident on the imaging mechanism by being reflected (including 2 reflections) from one of a general portion of the cover film and the imprint and the light emitted from the container film is substantially incident on the other of the two (including 2 reflections), and the light emitted from the container film is substantially not incident on the imaging mechanism;
the image processing means includes:
an imprint detection unit that detects the imprint by determining a light/dark state of the cover film based on image data obtained from the image signal;
and an inspection means for performing an inspection related to the imprint (for example, a determination means for determining whether the imprint is good or not) based on a detection result of the imprint detection means.
The term "flat portion (flange portion) of the container film" refers to "a substantially flat portion (bag portion non-forming region) of the container film where the bag portion is not formed and the cover film is attached".
The "general portion of the mask sheet" means "a portion of the mask sheet where no imprint is provided (imprint non-formation region)".
The "container film having light permeability (container film having a property of transmitting light)" includes a "transparent container film" which has high light transmittance and is viewed through the side facing the film. Here, "transparent" is an expression indicating a material of a film having light transmittance, and is independent of the presence or absence of color. Thus, a "transparent" container film obviously includes, for example, a "colorless transparent" container film, but also includes a "colored transparent" container film.
According to claim 1, the cover film attached to the container film is irradiated with predetermined light from the outer surface side of the container film over the container film, and the cover film irradiated with the light is imaged from the outer surface side of the container film over the container film.
Here, the predetermined angle of incidence of the light on the outer surface of the flat portion of the container film is set to a predetermined angle at which the light incident on the container film is reflected from one of a normal portion of the cover film and the imprint, and the light emitted from the container film is substantially incident on the imaging means and is reflected from the other, and the light emitted from the container film is substantially not incident on the imaging means.
Thus, in the luminance image data obtained by the imaging means, one of the normal portion and the imprint of the mask film is displayed brightly, and the other is displayed darkly.
Then, by setting a predetermined threshold value in consideration of the difference between the brightness and darkness (luminance difference), it is possible to detect the imprint as a bright portion or a dark portion. As a result, it is possible to perform an imprint inspection, such as a judgment of whether or not the imprint provided on the PTP sheet is good.
For example, when light is irradiated at a large incident angle at which the incident angle is larger than "a specific angle or a specific angle range", the imprint is displayed brighter than the normal portion of the mask film in the obtained luminance image data.
On the other hand, when light is irradiated at a small incident angle at which the incident angle is smaller than the "specific angle or the specific angle range", the imprint is displayed darker in the obtained luminance image data than in the normal portion of the mask film.
In particular, according to the present invention, the imprint is detected and inspected by imaging the unexposed surface side of the cover film (the surface protected by the container film). The non-exposed surface of the imprint is hard to generate a bad condition that the external surface is rough and the light scattering is strong like the exposed surface of the imprint which is rubbed by the direct contact of the convex mold of the imprint device. As a result, the imprint can be detected more appropriately, and inspection relating to the imprint can be performed more appropriately.
The "specific angle or specific angle range" is an angle or angle range (for example, 30 ° to 45 °) between the normal portion of the cover film and the imprint, which is difficult or impossible to be determined by the light and dark, and is determined by the shape (V-letter angle, etc.) of the imprint, the light transmittance of the container film, the light reflectance of the cover film, and the like. Thus, the "specific angle or specific angle range" is different for each style of article.
In addition, in the above-described aspect 1, "in the irradiation mechanism, the predetermined angle of incidence of the predetermined light on the outer surface of the flat portion of the container film is set to a predetermined angle at which the light incident on the container film is reflected from one of the general portion of the cover film and the imprint, the light emitted from the container film is substantially incident on the imaging mechanism and is reflected from the other, and the light emitted from the container film is substantially not incident on the imaging mechanism" may be said to be "the irradiation mechanism is set to a predetermined angle other than a specific angle or a specific angle range (for example, 30 ° to 45 °).
The invention according to claim 2 relates to the inspection apparatus according to claim 1, wherein:
in the irradiation mechanism, an incident angle of the predetermined light on the outer surface of the flat portion of the container film is set to a large incident angle (for example, 45 ° to 90 °) at which light reflected (including secondary reflection) from the imprint and emitted from the container film among the light incident on the container film is substantially incident on the imaging mechanism, and light reflected (including secondary reflection) from a general portion of the cover film and emitted from the container film is substantially not incident on the imaging mechanism;
the imprint inspection means is configured to detect a bright portion of the image data as the imprint.
According to claim 2, the image data obtained by the imaging means is printed brightly and displayed compared with the normal portion of the mask film. Thus, the imprint can be detected more suitably without being affected by a printed portion such as a mark, a character, or a pattern printed on the cover film, or foreign matter adhering to the outer surface of the flat portion of the container film.
The invention according to claim 3 relates to the inspection apparatus according to claim 1, wherein:
in the irradiation mechanism, an incident angle of the predetermined light on an outer surface of the flat portion of the container film is set to a small incident angle (for example, 0 ° to 30 °) at which light incident on the container film is reflected (including secondary reflection) from a general portion of the cover film and light emitted from the container film is substantially incident on the imaging mechanism, and light reflected (including secondary reflection) from the imprint and light emitted from the container film is substantially not incident on the imaging mechanism;
the imprint inspection means is configured to detect a dark portion of the image data as the imprint.
According to claim 3, the image data obtained by the imaging means is displayed brightly in the general portion of the mask film and the like, as compared with the imprint. Thus, for example, inspection of foreign matter adhering to the outer surface of the flat portion of the container film, inspection of foreign matter located between the container film and the cover film, inspection of foreign matter adhering to the contents received in the pocket portion, and the like can be performed simultaneously with the imprint inspection, and other inspections involving the PTP sheet can be performed, thereby improving inspection efficiency.
Further, by setting the incident angle of light to a small incident angle, the position (optical axis) of the irradiation mechanism can be made close to the position (optical axis) of the imaging mechanism. As a result, the enlargement of the space for installing the irradiation mechanism can be suppressed, and the inspection apparatus can be made compact.
Claim 4 relates to the inspection apparatus according to any one of claims 1 to 3, wherein the inspection mechanism includes:
a character recognition unit that recognizes a character (including a numeral, a symbol, and the like) engraved as the imprint based on a detection result of the imprint detection unit;
and a checking unit operable to check the engraved character recognized by the character recognition unit with a character stored in a predetermined storage unit in advance.
According to the above technical means 4, it is possible to check whether or not the contents of the stamp provided on the PTP sheet are suitable. Thus, even when a defect such as a lot number of a PTP sheet to be manufactured, or a difference in imprint between the contents (lot numbers) of imprints provided on PTP sheets actually manufactured occurs due to, for example, an attachment error of a punch to an imprint apparatus, the defect can be detected at an early stage by the verification. Further, based on the result of the check, an abnormality notification process, a process of stopping the production line, and the like can be performed at an early stage.
The invention according to claim 5 relates to the inspection apparatus according to any one of claims 1 to 4, comprising:
a 2 nd irradiation mechanism capable of irradiating a film body (PTP film, PTP sheet) in which the cover film is attached to the container film with predetermined light;
a 2 nd imaging means provided on the opposite side of the 2 nd irradiation means via the film body, for imaging light passing through the film body;
the image processing means includes a cut-through detection means for determining the brightness of the film body based on image data obtained from the image signal output from the 2-camera means, and detecting a cut-through penetrating the overcoat film.
For example, when the amount of punches inserted into a film body such as a PTP film is too large due to a bad condition of an imprint apparatus, there is a risk that the cover film is cut, a slit is formed in a part of the cover film, and a through portion is printed immediately.
In this case, according to claim 5, a part of the light irradiated from the 2 nd illumination means to the film body passes through the stamp penetration portion and is imaged by the 2 nd imaging means. In addition, in the image data obtained by the 2 nd imaging means, the portion where the through-hole is engraved is displayed brighter than other normal portions.
That is, when a bright portion is detected in the image data obtained by the 2 nd imaging means, it can be determined that a cut (through-cut-mark portion) is formed in the cover film.
Thus, for example, the thickness of the imprint (character) is within the appropriate range, and a defective product that cannot be detected by the reflective inspection, such as a defective product in which the imprint penetrates through the film body, can be detected more reliably. As a result, the inspection accuracy of the inspection involving the imprint can be further improved.
Here, it is preferable that the optical axis (incident angle 0 °) of the 2 nd irradiation mechanism is set in the normal direction of the film body (the outer surface of the flat portion of the container film or the general portion of the cover film), and the optical axis of the 2 nd imaging mechanism is set in the normal direction of the film body.
Technical solution 6. a PTP packaging machine including the inspection device according to any one of technical solutions 1 to 5 is related.
As in claim 6, the PTP packaging machine provided with the inspection device of claim 1 or the like has an advantage that PTP sheets (defective products) with defective imprints are eliminated in the production process of PTP sheets.
In general, a PTP packaging machine includes: a bag forming mechanism for forming a bag on a container film conveyed in a belt shape; a filling mechanism for filling the bag with a content; a mounting means for mounting a band-shaped cover film on the container film filled with the content in the bag portion so as to close the bag portion; an imprint mechanism that sets an imprint at a predetermined position on the cover film side in a band-shaped film body (PTP film) in which the cover film is attached to the container film; and a cutting mechanism for cutting the PTP sheet (including a punching mechanism for punching in sheet units) from the band-shaped film body. The PTP packaging machine may include a discharge mechanism that discharges PTP pieces that have been determined to be defective by the inspection device.
Here, a configuration may also be made wherein, in the above-described claim 6, the above-described inspection device is provided in a "subsequent step of providing the imprint by the imprint mechanism, and a previous step of dicing the PTP pieces by the dicing mechanism".
If formed in this way, a PTP sheet (defective) with defective imprint formation can be detected at an earlier stage after the imprint step. Further, the production of the PTP sheet can be stopped at an earlier stage. The number of defective products can be suppressed.
In the step prior to the separation of the PTP sheet from the band-shaped film body (PTP film), the position or orientation of the PTP sheet range constituting the inspection object is maintained constant relative to the irradiation mechanism and the imaging mechanism at the time of inspection. Thus, even when the detection or inspection of the imprint is performed, it is not necessary to adjust the position or orientation of the PTP sheet range in advance, and the inspection can be performed more easily and at higher speed. Further, the inspection accuracy can be further improved.
In addition, it is also possible to provide the inspection apparatus described above in the "subsequent step of dividing the PTP sheet by the dividing mechanism". In this case, it is possible to check whether or not a defective product is not mixed in at the final stage.
The present invention according to claim 7 relates to a method for manufacturing a PTP sheet in which a predetermined content is received in a bag portion formed in a translucent container film, and a cover film is attached to an inner surface of a flat portion of the container film so as to close the bag portion, the method comprising:
a bag forming step of forming the bag on the container film conveyed in a belt shape;
a filling step of filling the bag with the content;
a mounting step of mounting a band-shaped cover film on the container film having the contents accommodated in a bag portion so as to close the bag portion;
an imprint step of providing an imprint at a predetermined position on the cover film side in a band-shaped film body (PTP film) in which the cover film is attached to the container film;
a dicing step of dicing the PTP sheet from the band-shaped film body (including a punching step of punching in sheet units);
and an imprint inspection step of performing an inspection involving the aforementioned imprint.
According to claim 7, the same operational effects as those of claim 6 are achieved. Then, it is also possible to form a scheme in which, in the above-described technical scheme 7, the above-described imprint inspection step is performed at a "step after the imprint step and before the dicing step". In addition, a scheme may be formed in which the above-described imprint inspection step is performed at "a step after the dicing step".
The invention according to claim 8 relates to the method for manufacturing a PTP sheet according to claim 7, wherein the imprint inspection step includes:
an irradiation step of irradiating the cover film with a predetermined light from the outer surface side of the container film over the container film;
an imaging step of imaging the cover film irradiated with the predetermined light from an outer surface side of the container film over the container film;
an imprint detection step of detecting the imprint by determining a brightness of the mask film based on the image data obtained in the image pickup step;
in the irradiating step, the predetermined light incident angle on the outer surface of the flat portion of the container film is set to an angle at which the light incident on the container film is reflected (including secondary reflection) from one of a general portion of the cover film and the imprint, the light emitted from the container film is substantially incident on the imaging means, and the light emitted from the container film is reflected (including secondary reflection) from the other, and the light emitted from the container film is substantially not incident on the imaging means.
According to claim 8, the same effects as those of claim 1 are achieved.
Drawings
FIG. 1(a) is a perspective view showing the outside of a PTP sheet, and FIG. 1(b) is a perspective view showing the inside of the PTP sheet;
FIG. 2 is an enlarged partial cross-sectional view of a PTP tablet;
FIG. 3 is a perspective view showing a PTP membrane;
fig. 4 is a schematic diagram showing the general structure of the PTP packaging machine;
FIG. 5 is a cross-sectional view of a portion of an X-Z plane of an imprint apparatus mainly showing a basic mechanism section;
FIG. 6 is a cross-sectional view of a portion of the imprint apparatus shown mainly in the X-Z plane of the pressing mechanism;
FIG. 7 is a cross-sectional view of a Y-Z plane portion of the imprint apparatus mainly showing a pressing mechanism portion;
fig. 8 is a partially enlarged sectional view of the imprint apparatus showing the elastic mechanism portion;
fig. 9 is a partially enlarged sectional view showing an imprint apparatus of a punch or the like;
fig. 10 is a schematic view showing an electrical configuration of the imprint inspection apparatus;
FIG. 11 is a schematic view showing a configuration of an imprint inspection apparatus;
fig. 12 is a schematic diagram for explaining an optical path of light irradiated from the illumination device;
FIG. 13 is a flowchart showing an inspection flow;
FIG. 14 is a schematic view showing a configuration of an imprint inspection apparatus according to another embodiment;
fig. 15 is a schematic view for explaining an optical path of light irradiated from the illumination device according to another embodiment;
fig. 16 is a schematic diagram showing a configuration of a conventional inspection apparatus.
Detailed Description
An embodiment will be described below with reference to the drawings. First, the structure of the PTP sheet will be specifically explained.
As shown in fig. 1(a), 1(b) and 2, the PTP sheet 1 includes: a container film 3, the container film 3 having a plurality of bag portions 2; and a cover film 4, wherein the cover film 4 is attached to the inner surface of the flat portion 3a of the container film 3 so as to seal the bag portion 2.
The container film 3 of the present embodiment is formed of a colorless and transparent thermoplastic resin material such as PP (polypropylene), PVC (polyvinyl chloride), or the like, and has light transmittance.
On the other hand, the cover film 4 is made of an opaque material such as an aluminum foil (aluminum laminate sheet) provided on the outer surface with a sealant made of, for example, a polypropylene resin, and has no light transmittance.
The PTP sheet 1 has a substantially rectangular shape in plan view. In the PTP sheet 1, 2 rows of pockets are formed in the sheet transverse direction, each row of pockets being constituted by 5 pocket portions 2 arranged in the sheet longitudinal direction. That is, a total of 10 bag portions 2 are formed. In each pocket 2, tablets 5 as contents are received one at a time.
A plurality of slits 7 for slitting are formed in the container film 3 of the PTP sheet 1 in such a manner that: the PTP sheet 1 may be cut in units of 2 small sheets 6 of the pouch portion 2. Each slit 7 for splitting is formed in the sheet transverse direction of the PTP sheet 1.
Further, a tab portion 8 is provided at one end portion in the sheet longitudinal direction of the PTP sheet 1. As shown in fig. 1(b), an imprint K is provided on the label portion 8 on the cover film 4 side.
In the present embodiment, a lot number "ABC 001" as identification information composed of a combination of 6 characters (including numbers) is provided as the stamp K. Obviously, the scheme of the engraving such as the number of characters or contents of the engraving K is not limited to this. For example, a recipe may be provided as the imprint K instead of or in addition to the lot number, the date of manufacture, the time of use, or the like.
As shown in fig. 1(a), the mark K can be seen from the container film 3 side in a state of being inverted from the inside to the outside through the transparent container film 3.
The characters ("a", "B", "C", "0" and "1") constituting the stamp K are each formed by a groove portion having a V-shaped cross section and engraved on the cover film 4 side.
The PTP sheet 1 (see fig. 1) is manufactured by: a band-shaped PTP film 9 (see fig. 3) as a film body including the band-shaped container film 3 and the band-shaped cover film 4 is punched in a sheet shape.
Next, the general structure of the PTP packaging machine 10 for producing the PTP sheet 1 will be described with reference to fig. 4.
As shown in fig. 4, a raw material roll of the band-like container film 3 is wound in a roll shape on the most upstream side of the PTP packaging machine 10. The projecting end side of the container film 3 wound in a roll shape is guided to the guide roller 13. The container film 3 is wound around the intermittent transfer roller 14 on the downstream side of the guide roller 13. The intermittent conveyance roller 14 is connected to a motor that rotates intermittently, and conveys the container film 3 intermittently.
Between the guide roller 13 and the intermittent conveyance roller 14, a heater 15 and a bag former 16 are provided in this order along the conveyance path of the container film 3. Further, the container film 3 is heated by the heater 15, the container film 3 is in a relatively soft state, and the bag portion forming device 16 forms a plurality of bag portions 2 at predetermined positions of the container film 3 (bag portion forming step). The heater 15 and the bag former 16 constitute a bag forming mechanism of the present embodiment. The bag portion 2 is formed at the time of the interval between the conveying operations of the container film 3 by the intermittent conveying roller 14.
The container film 3 fed out from the intermittent feed roller 14 is wound around a tension roller 18, a guide roller 19, and a film receiving roller 20 in this order. Since the film receiving roller 20 is connected to a motor that rotates to some extent, the container film 3 is conveyed continuously and at a certain speed. The tension roller 18 is in a state of stretching the container film 3 toward the side tensioned by the elastic force, and prevents the container film 3 from being deflected due to the difference in the conveying operation between the intermittent conveying roller 14 and the film receiving roller 20, thereby constantly maintaining the container film 3 in a tensioned state.
Between the guide roller 19 and the film receiving roller 20, a tablet filler 21 and a tablet inspection device 22 are provided in this order along the transport path of the container film 3.
The tablet filling device 21 functions as a filling mechanism for automatically filling the bag 2 with the tablets 5. The tablet filling device 21 drops the tablets 5 by opening the shutter at predetermined intervals in synchronization with the conveying operation of the container film 3 by the film receiving roller 20, and fills the bags 2 with the tablets 5 in accordance with the opening operation of the shutter (filling step).
The tablet inspection device 22 is used to perform an inspection mainly relating to a tablet failure, such as whether or not the tablet 5 is reliably filled in the bag portion 2, whether or not there is an abnormality in the tablet 5, whether or not foreign matter is mixed in the bag portion 2, and the like.
On the other hand, the raw material roll of the cover film 4 formed in a band shape is wound in a roll shape on the most upstream side.
The protruding end of the cover film 4 wound in a roll shape is guided to the heating roller 25 by the guide roller 24. The heating roller 25 is brought into pressure contact with the film receiving roller 20, and the container film 3 and the cover film 4 are fed between the rollers 2, 20 and 25.
The cover film 4 is bonded to the container film 3 by passing the container film 3 and the cover film 4 between the 2 rollers 20 and 25 in a heat-pressure bonded state, and the bag portion 2 is closed by the cover film 4 (mounting step). Thereby, the PTP film 9 in a belt shape in which the tablet 5 is received in the bag portion 2 is manufactured. Thus, a firm seal is achieved. The film receiving roller 20 and the heating roller 25 constitute the mounting mechanism of the present embodiment.
The PTP film 9 fed out from the film receiving roller 20 is wound around the tension roller 27 and the intermittent conveyance roller 28 in this order. Since the intermittent conveyance roller 28 is connected to a motor that rotates in an intermittent manner, the PTP film 9 is conveyed in an intermittent manner. The tension roller 27 is in a state of tensioning the PTP film 9 toward the side tensioned by the elastic force, and prevents the PTP film 9 from being flexed due to the difference in the conveying operation between the film receiving roller 20 and the intermittent conveying roller 28, and constantly holds the PTP film 9 in a tensioned state.
The PTP film 9 fed out from the intermittent conveyance roller 28 is wound around the tension roller 33 and the intermittent conveyance roller 34 in this order. Since the intermittent conveyance roller 34 is connected to a motor that rotates in an intermittent manner, the PTP film 9 is conveyed in an intermittent manner. The tension roller 33 is in a state of stretching the PTP film 9 toward the side tensioned by the elastic force, and prevents the PTP film 9 from being bent between the intermittent conveyance rollers 28, 34.
Between the intermittent conveyance roller 28 and the tension roller 33, a slit former 29, an imprint apparatus 30, and an imprint inspection apparatus 31 are provided in this order along the conveyance path of the PTP film 9.
The bag former 29 functions as a slit forming mechanism for forming the slit 7 for slitting at a predetermined position of the container film 3 of the PTP film 9.
The imprint apparatus 30 has a function of providing the above-described imprint K at a predetermined position on the cover film 4 side of the PTP film 9 (in the present embodiment, a position corresponding to the label portion 8 in the PTP sheet 1 after punching).
The imprint inspection device 31 is used to perform an inspection concerning the imprint K, whether or not the imprint K or the like is appropriately provided on the PTP film 9.
The PTP film 9 fed from the intermittent transport roller 34 is wound around the tension roller 35 and the continuous transport roller 36 in this order on the downstream side thereof. Between the intermittent conveyance roller 34 and the tension roller 35, a sheet punch 37 is provided along the conveyance path of the PTP film 9.
The sheet punch 37 includes a function as a sheet punching mechanism (a slitting mechanism) that punches the outer edge of the PTP film 9 in units of PTP sheets 1. In the present embodiment, the PTP sheet 1 is pressed in the Z-axis direction, which is the vertical direction, in such a manner that: the sheet width direction is along the X-axis direction which is the transport direction (film transport direction) of the PTP film 9, and the sheet length direction is along the Y-axis direction (film width direction) which is the width direction (film width direction) of the PTP film 9 orthogonal to the film transport direction (X-axis direction) (see fig. 1, 3, 4, and the like).
The PTP pieces 1 punched by the piece punch 37 are transported by the conveyor 39 and temporarily stored in the finished product hopper 40 (cutting step). However, the PTP sheet 1 determined as a defective product by the tablet inspection device 22 and the imprint inspection device 31 is not fed to the product hopper 40, but is discharged individually by a defective sheet discharge mechanism that is a discharge mechanism not shown in the drawings.
A cutter 41 is provided downstream of the continuous feed roller 36. The unnecessary film portion 42 constituting the surplus material portion (scrap portion) remaining in a band shape after the punching by the sheet punch 37 is guided to the tension roller 35 and the continuous feed roller 36, and then guided to the cutter 41. The continuous transport roller 36 is pressed by the driven roller, and performs a transport operation while sandwiching the unnecessary film portion 42. The cutter 41 has a function of cutting the unnecessary film portion 42 to a predetermined size and performing waste disposal. The waste is stored in the waste hopper 43 and then separately discarded.
The rollers 14, 20, 28, 33, 34, etc. are in a positional relationship in which the roller surfaces face the bag 2, but since the concave portion for receiving the bag 2 is formed on the surface of the intermittent conveyance roller 14, etc., the bag 2 is not crushed. Further, the bag portion 2 is received in each concave portion of the intermittent conveyance roller 14 or the like and the conveyance operation is performed, whereby the intermittent conveyance operation or the continuous conveyance operation is reliably performed.
The PTP packaging machine 10 includes a management controller that controls driving of various devices such as the bag former 16, the tablet stuffer 21, the imprint device 30, and the tablet punch 37, and controlling driving of various rollers such as the gap transport roller 14 (see fig. 10), although specific illustration thereof is omitted.
The management controller includes: a CPU as an arithmetic means, a ROM for storing various programs, and a RAM for temporarily storing various data such as arithmetic data and input/output data.
The management controller stores various product information relating to the PTP sheet 1 to be manufactured, such as the product information and lot number of the tablet 5, in the RAM. The product information may be set manually in advance by an input operation of an operator, or may be received from a host computer of a factory or the like and automatically set.
Further, a stacking device, a transfer device, a packaging device, and the like, which are not shown in the drawings, are provided in this order on the downstream side of the PTP packaging machine 10. The PTP sheets 1 in parallel received in the product hopper 40 are wrapped in a group of, for example, 2, and then stacked in a plurality of groups in a stacking device. The aggregate of the plurality of PTP sheets 1 stacked up is transferred to a packaging device while being bundled by a transfer device, and pillow-packed in the packaging device.
The general structure of the PTP packaging machine 10 is as described above, and the structure of the above described imprint apparatus 30 and imprint inspection apparatus 31 will be specifically described below with reference to the drawings.
First, the imprint apparatus 30 will be described with reference to the drawings. Fig. 5 is an X-Z top cross-sectional view of the imprint apparatus 30 taken along an X-Z plane including the X-axis direction and the Z-axis direction, and is a top cross-sectional view mainly showing a basic mechanism portion 140 of the imprint apparatus 30.
As shown in fig. 5, the basic mechanism section 140 of the imprint apparatus 30 includes a predetermined crank mechanism 141 and a movable base plate 142, and the movable base plate 142 is provided so as to be movable up and down by the crank mechanism 141. More specifically, a bracket 143 is fixed to a lower middle portion of the movable base plate 142 in a hanging manner, and the crank mechanism 141 is provided on the bracket 143.
The crank mechanism 141 includes a drive shaft 144A rotationally driven by a motor not shown in the drawing; a rotating plate 144B provided on the front end of the driving shaft 144A; an eccentric shaft 145 provided eccentrically to the rotating plate 144B (drive shaft 144A); and a connecting arm 146, the connecting arm 146 connecting between the eccentric shaft 145 and the bracket 143.
A plurality of rods 147 are provided in a suspended state on the movable base plate 142. These rods 147 pass through a reel 148 fixed via a bearing mechanism not shown in the drawings. Thus, if the drive shaft 144A rotates, the eccentric shaft 145 rotates about the drive shaft 144A, and the connecting arm 146 moves up and down. At this time, since the movement of the lever 147 only in the Z-axis direction is allowed, the movable plate 142 moves up and down in the Z-axis direction.
Further, the basic mechanism portion 140 of the imprint apparatus 30 is provided with a top plate 155, and the top plate 155 is immovably fixed above the movable substrate 142. A support plate 156 is fixed to a lower portion of the top plate 155. The bottom surface of the support plate 156 is a flat surface. Further, between the support plate 156 and the movable base plate 142, the PTP film 9 with the bag portion 2 facing downward is intermittently conveyed rightward in the X-axis direction in fig. 5.
Stoppers 157 (see fig. 7) are erected at both ends in the width direction (Y-axis direction) of the movable substrate 142. Thus, when the movable base 142 moves upward, the stopper 157 abuts against the support plate 156, and the upward movement of the movable base 142 by a predetermined amount or more is restricted.
A pressing mechanism 159 (see fig. 6 and 7) is provided at one end in the width direction (Y-axis direction) of the basic mechanism 140. Fig. 6 is a partial cross-sectional view of the imprint apparatus 30 mainly showing the pressing mechanism 159, taken along the X-Z plane, and fig. 7 is a partial cross-sectional view of the imprint apparatus 30 mainly showing the pressing mechanism 159, taken along the Y-Z plane.
The pressing mechanism 159 is a mechanism for pressing the punch 158 from the cover film 4 side of the PTP film 9 to apply the above-described imprint K to the cover film 4 side of the PTP film 9.
More specifically, a hole 162 is formed at one end in the width direction of the support plate 156 and the top plate 155, and the pressing mechanism 159 is provided so as to be movable up and down inside the hole 162.
On the other hand, a pressure receiving portion 161 is provided at one end portion in the width direction of the movable substrate 142 so as to face the pressurizing mechanism 159, and the pressure receiving portion 161 receives the pressure from the pressurizing mechanism 159 on the container film 3 side.
The pressure receiving portion 161 is provided slightly lower than the front end of the stopper 157. The structure is as follows: when the stopper 157 abuts against the support plate 156 when the movable base 142 moves upward, a gap of the thickness of the PTP film 9 is generated between the support plate 156 and the pressure receiving portion 161 at the periphery of the lower opening portion of the hole portion 162.
As shown in fig. 6 and 7, the pressing mechanism 159 includes a bracket 163 standing on the top plate 155. An air cylinder 164 constituting a pressure adjusting mechanism is provided above the bracket 163. At the lower portion of the cylinder 164, a rod 165 is provided in a retractable manner. A support arm 166 is fixed to the bottom end of the rod 165. A heating block 167 constituting a heating mechanism is provided on the support arm 166. A punch holder 168 is provided at a lower portion of the heating block 167.
The punch holder 168 is configured to hold a plurality of (up to 10) punches 158. However, since the imprint K (lot number "ABC 001") provided on the PTP sheet 1 of the present embodiment is 6 characters, only 6 punch holding portions among the punch holding portions that hold 10 positions of 10 punches 158 are used, and the remaining 4 punch holding portions are not used.
In the present embodiment, the 6 punches 158 corresponding to the characters ("a", "B", "C", "0", and "1") constituting the imprint K are held by the punch holder 168 in a predetermined order. A cap 169 is attached and fixed to the punch holder 168 to fix the punches 158.
Further, when the imprint apparatus 30 is operated, the cylinder 164 is driven, and the rod 165 protrudes downward. As a result, as shown by the two-dot chain line in fig. 6 and 7, the heater block 167 and the like enter the hole 162, and the tip of the punch 158 protrudes below the bottom surface of the support plate 156 (see fig. 9).
On the other hand, when the imprint apparatus 30 is not in operation, the rod 165 is provided inside the cylinder 164. Thereby, as shown by solid lines in fig. 6 and 7, the punch 158 and the like are held at the waiting position.
Further, on the other end side in the width direction of the support plate 156 (the side opposite to the pressing mechanism 159 in the Y-axis direction), an elastic mechanism 173 constituting a pressing force equalizing mechanism is provided so as to face the stopper 157 on the other end side.
More specifically, a recess 174 is formed in the support plate 156, and a coil spring 175 is provided inside the recess 174. A protruding piece 176 is provided at the bottom end of the coil spring 175. In addition, normally, the projecting piece 176 projects slightly downward from the bottom surface of the support plate 156 (see fig. 7).
On the other hand, as shown in fig. 8, when the movable substrate 142 moves upward, the pressing force exceeds the biasing force of the coil spring 175, and the protruding piece 176 is hidden in the recessed portion 174 against the biasing force.
The biasing force of the coil spring 175 according to the present embodiment is preset in such a manner that: the load moment of the pressing mechanism portion 159 provided on the opposite side end portion is appropriately adjusted to uniformly apply the pressing force at least in the width direction of the PTP film 9 and to adjust the pressing force from the punch 158.
The structure of imprint inspection apparatus 31 will be specifically described below with reference to the drawings. Fig. 10 is a block diagram showing an electrical configuration of the imprint inspection apparatus 31, and fig. 11 is a schematic diagram showing a configuration of the imprint inspection apparatus 31.
As shown in fig. 10 and 11, the imprint inspection apparatus 31 includes an illumination apparatus 52 as an irradiation mechanism, and the illumination apparatus 52 irradiates a predetermined light to the PTP film 9; an imaging device (camera) 53 as an imaging means, the imaging device 53 imaging the PTP film 9 irradiated with the light; and a control processing device 54, wherein the control processing device 54 performs various controls, image processing, arithmetic processing, and the like in the imprint inspection device 31 such as drive control of the illumination device 52 and the imaging device 53.
In the present embodiment, the illumination device 52 is a ring-shaped ring lamp that can emit light from all directions.
The illumination device 52 is provided so as to be capable of projecting a predetermined light from below the cover film 4 obliquely across the container film 3 located on the bottom surface side of the PTP film 9. In the present embodiment, the light source is configured to be capable of emitting diffuse white light (visible light).
More specifically, in the illumination device 52, the incidence α of light with respect to the outer surface of the flat portion 3a of the container film 3, that is, the angle α between the optical axis (irradiation direction) JA at each position in the circumferential direction of itself and the normal direction of the outer surface of the flat portion 3a of the container film 3 is set at a large incidence angle of 70 °.
The imaging device 53 is provided directly below the PTP film 9, and an optical axis JB thereof is set in a vertical direction (Z-axis direction) which is a normal direction of the outer surface of the flat portion 3a of the container film 3. The imaging device 53 is configured to be able to image a predetermined inspection range predetermined from the PTP film 9 with respect to the container film 3. In the present embodiment, a predetermined range including the tag portion 8 among the range corresponding to 1 PTP slice 1 constituting the inspection target is set as the inspection range.
In the present embodiment, the imaging device 53 employs a CCD camera. Obviously, the present invention is not limited to this, and a CMOS camera may be used.
Thus, the PTP film 9 is irradiated with light irradiated from the illumination device 52, and reflected light reflected by the PTP film 9 (reflected light mainly transmitted through the container film 3 and reflected by the cover film 4) is subjected to 2-dimensional imaging by the imaging device 53.
Here, the image data (luminance image data) captured by the imaging device 53 is converted into a digital signal (image signal) inside the imaging device 53, and then input to the control processing device 54 as a digital signal.
Next, the control processing device 54 performs shading (shading) compensation processing on the obtained image data, and then stores the shading compensated image data in an image data storage device 74 described later. In addition, in the shading compensation process, since it is difficult to uniformly illuminate the entire predetermined inspection range of the PTP film 9 by the illumination device 52, the shading compensation process is performed so as to compensate for the brightness variation due to the brightness of light and dark due to the difference in the position. Obviously, a scheme without shading compensation may also be performed.
Then, the control processing device 54 performs image processing and arithmetic processing as described later on the basis of the image data. The control processing device 54 constitutes the image processing means of the present embodiment.
Here, the configuration of the control processing device 54 will be described with reference to fig. 10. The control processing device 54 includes a CPU and an input/output interface 71 (hereinafter referred to as "CPU or the like 71") for controlling the entire imprint inspection device 31; an input device 72 as an "input mechanism" constituted by a keyboard, a mouse, a touch panel, or the like; a display device 73 having a display screen such as a CRT or a liquid crystal as a "display means"; an image data storage device 74 for storing various image data; an operation result storage device 75 for storing various operation results and the like; a setting data storage device 76 for storing various information in advance, and the like. The devices 72 to 76 are electrically connected to a CPU 71.
The CPU or the like 71 is connected to the management controller of the PTP packing machine 10 so as to transmit and receive various signals and various information. Thus, for example, a control signal for operating the defective sheet discharge mechanism can be output to the management controller of the PTP packaging machine 10, or product information such as a lot number can be obtained from the management controller of the PTP packaging machine 10.
The image data storage device 74 is used to store luminance image data and the like obtained by the imaging device 53. In the inspection, the image data subjected to the matching processing, the binarized image data subjected to the binarization processing, and the like are similarly stored in the image data storage device 74.
The operation result storage device 75 stores inspection result data, statistical data obtained by processing the inspection result data in a probabilistic manner, and the like. These inspection result data and statistical data can be appropriately displayed on the display device 73.
The setting data storage device 76 stores, for example, the contents (lot numbers) of the imprints K including design data for specifying the shapes, sizes, and the like of the PTP sheet 1, the bag portion 2, and the tablet 5, various thresholds used for imprint inspection, non-defective data, and the like.
The following describes the production process of the PTP sheet 1. In particular, in the PTP packaging machine 10, the main steps of the present invention after the cover film 4 is attached to the container film 3 will be described.
The PTP film 9 after the cover film 4 is attached to the container film 3 is first fed to the slit forming step by the slit former 29. In this slit forming step, the slit 7 for slitting is formed at a predetermined position of the PTP film 9 in accordance with the movement of the movable die (reference numeral omitted) of the slit former 29 from the standby position to the working position.
If the slit forming step is finished, the PTP film 9 is intermittently transported, and the PTP film 9 is transferred to the embossing step by the embossing device 30. In this imprint step, the imprint K is applied to a position corresponding to the label portion 8 in the PTP sheet 1 after punching. The following specifically explains the process.
In this imprint step, first, if the PTP film 9 that is intermittently transported is stopped, the movable substrate 142 of the imprint inspection device 30 moves upward.
Then, the stopper 157 abuts against the bottom surface of the support plate 156, and the upward movement of the movable base plate 142 by a predetermined amount or more is restricted. At the same time, the pressure receiving portion 161 is in a state of supporting the PTP film 9 from below at a position below the lower opening portion of the hole portion 162 (see fig. 9).
Then, the pressing mechanism 159 enters the hole 162, and the tip of the punch 158 protrudes from the bottom surface of the support plate 156. Thereby, the protruding portion of the punch 158 enters the PTP film 9 from the cover film 4 side, and the portion corresponding to the protruding portion of the punch 158 is recessed and plastically deformed. As a result, the above-mentioned imprint K is formed on the PTP film 9.
At this time, since the punch 158 is heated by conduction heat from the heating block 167, smooth penetration into the PTP film 9 can be promoted, and the imprint K can be formed with more excellent accuracy.
The pressure receiving portion 161 of the present embodiment is made of stainless steel having low thermal conductivity, and is configured to be less susceptible to thermal conduction. This can prevent the container film 3 on the opposite side from being significantly softened when the imprint K is formed. Further, it is possible to suppress a problem that the imprint K is crushed and cannot be recognized.
If the formation of the imprint K is finished as described above, the movable substrate 142 returns to the original position, and the imprint step is finished.
When the imprint step is completed, the PTP film 9 is intermittently transported to the imprint inspection step by the imprint inspection apparatus 31.
Here, the flow of the imprint inspection step will be specifically described with reference to the flow of fig. 13 and the like. The inspection flow of the imprint inspection step shown in fig. 13 is a process that is repeatedly performed every time the PTP film 9 is conveyed at predetermined intervals.
If the PTP film 9 that is intermittently transported is once stopped, the control processing device 54 performs the image pickup processing (step S1).
Specifically, the control processing device 54 drives and controls the illumination device 52 and the imaging device 53 based on a signal from an encoder, not shown, provided in the PTP packaging machine 10, and irradiates light from the illumination device 52 to a predetermined inspection range on the container film 3 side of the PTP film 9 that has been stopped (irradiation step), and also images the inspection range irradiated with the light by the imaging device 53 (imaging step).
The control processing device 54 acquires the luminance image data imaged by the imaging device 53 into the image data storage device 74. This makes it possible to obtain luminance image data of the inspection range in the PTP slice 1 of 1 slice constituting the inspection target.
Here, as shown in fig. 12, the light L01 to L03 incident on the container film 3 are finally reflected by the inclined surface (non-exposed surface) of the stamp mark K on the container film 3 side by being irradiated from the illumination device 52 toward the PTP film 9, and the light L02, L03 emitted from the outer surface of the flat portion 3a of the container film 3 is incident on the imaging device 53.
In the present embodiment, the light beams L02 and L03 incident on the container film 3 are once reflected by other parts such as a normal part of the cover film 4, and then reflected twice by the inclined surface of the imprint K, and finally emitted from the outer surface of the flat part 3a of the container film 3 (see fig. 12).
On the other hand, the light L01 reflected by the normal portion (imprint non-formation region) of the cover film 4 and emitted from the outer surface of the flat portion 3a of the container film 3 as it is does not enter the imaging device 53.
The container film 3 is formed of a resin material having a refractive index higher than a predetermined refractive index of air. Then, when light irradiated from the illumination device 52 enters the container film 3, the light is refracted when it exits the container film 3 again, and the traveling direction changes.
Then, since the light mainly reflected from the stamp K is captured by the imaging device 53, luminance image data in which the stamp K is displayed brightly compared with other portions or parts is obtained.
Next, the control processing device 54 performs binarization processing on the luminance image data obtained in step S1 (step S2).
Specifically, the luminance image data is converted into binary image data in which the field equal to or larger than the threshold value δ is "1 (bright)" and the field smaller than the threshold value δ is "0 (dark)" based on a predetermined threshold value δ stored in advance in the setting data storage device 76.
Thus, binary image data is obtained in which the portion with the imprint K (imprint forming region) is "1 (bright)" and the other portion (imprint non-forming region) such as a normal portion of the overcoat film 4 is "0 (dark)".
When the conversion into the binarized image data is completed, the control processing unit 54 stores the binarized image data in the image data storage unit 74.
Then, the control processing means 54 performs block processing on the binarized image data obtained in step S2 (step S3).
In this block processing, processing for specifying each connected component for "0 (dark)" and "1 (light)" of the binarized image data, and label application processing for applying a label to the corresponding connected component are performed. Here, the occupied area of each of the connection portions specified is represented by the number of bits corresponding to the pixel of the imaging device 53.
Next, the control processing device 54 performs imprint formation area designation processing (step S4). Specifically, the control processing device 54 first specifies the position of the bag portion 2 of the binarized image data using design data or the like stored in advance in the setting data storage device 76.
Obviously, it is not limited to this, and a scheme may be formed in which the position of the pocket 2 or the tablet 5 in the binarized image data is specified from the luminance image data obtained in step S1.
Next, the control processing device 54 performs a check frame setting process for setting a check frame on the binarized image data.
Specifically, in the inspection frame setting process, in the width direction (Y-axis direction) of the PTP film 9, an inspection frame is set in a predetermined range in the transport direction (X-axis direction) of the PTP film 9 with respect to the region between the width-direction end edge of the PTP film 9 on the side where the tab portion 8 is formed and the bag portion 2 adjacent thereto. In the present embodiment, a check box is set for each character ("a", "B", "C", "0", and "1") constituting the imprint K. At the same time, matching processing is performed for the region outside the inspection box outside the inspection object.
Note that, instead of setting the check frame based on the bag portion 2, the check frame may be set based on the position of the tablet 5 specified from the luminance image data obtained in step S1.
Thereafter, the control processing device 54 specifies a region (imprint forming region) corresponding to a connected component of "1 (clear)" of each character of the imprint K in each inspection frame.
Then, the imprint detection step of the present embodiment is configured by a series of processing in steps S2 to S4, and the imprint detection means is configured by the function of the image processor 54 that performs the series of processing.
Then, the control processing device 54 performs pattern matching processing of the imprint forming regions in the respective inspection frames designated in step S4 and non-defective product data stored in advance in association with the imprint forming regions (step S5). The processing is performed by a known pattern matching method, and the shape data of each character created from image data obtained by imaging an imprint K provided in advance on the PTP plate 1 of the non-defective product is stored as the non-defective product data.
Next, the control processing device 54 performs a process of determining whether each character of the stamp mark K is good or not, based on the result of the pattern matching process performed in step S5 (step S6). The function of the control processing device 54 performing this processing constitutes the inspection means (determination means) of the present embodiment.
Specifically, it is determined whether or not the matching rate of the pattern matching process performed in step S5 is within a predetermined allowable range. Thus, for example, it is possible to determine whether or not the characters of the imprint K are flattened and cannot be interpreted because the degree of entrance of the punch 158 is large; whether the entering degree of the male die 158 is small, the characters of the imprint K rub and cannot be read, and whether the size of the characters of the imprint K is suitable or not.
The determination process is performed for each check box (6 characters included in the stamp K). When all the 6 characters included in the stamp mark K are within the allowable range, the control processing device 54 determines the non-defective product in step S7, stores the result in the calculation result storage device 75, and ends the inspection program.
On the other hand, if the number of characters is not within the allowable range even in the case of 1 of the 6 characters, the failure determination is performed in step S8, the result is stored in the calculation result storage device 75, and the content is output to the management controller or the like of the PTP packaging machine 10, and the inspection program is ended.
If the imprint inspection step is ended, the PTP film 9 is conveyed in an intermittent manner, and goes to a sheet punching step of punching by the sheet punch 37. In the sheet punching step, the movable die (no reference numeral) of the sheet punch 37 moves from the waiting position to the working position, thereby punching the outer edge of the PTP film 9 in units of PTP sheets 1. As a result, the PTP sheet 1 is separated from the PTP membrane 9, and the PTP sheet 1 shown in FIG. 1 can be obtained.
As described above in detail, according to the present embodiment, by providing the imprint inspection device 31, the inspection of the imprint K applied to the PTP sheet 1 can be performed in the manufacturing process (on-line) of the PTP sheet 1.
Here, the imprint inspection apparatus 31 is configured in such a manner that: the inspection range (corresponding position of the label portion 8) of the cover film 4 in the PTP film 9 is irradiated with light from the outer surface side of the container film 3 over the container film 3, and the inspection range of the cover film 4 irradiated with the light is imaged by the imaging device 53 over the container film 3 from the outer surface side of the container film 3, whereby luminance image data of the inspection range is obtained.
In the imprint inspection apparatus 31, the incidence angle (the angle between the optical axis JA at each position in the circumferential direction of the illuminator 52 and the normal direction of the outer surface of the flat portion 3a of the container film 3) α of the light irradiated from the illuminator 52 onto the PTP film 9 with respect to the outer surface of the flat portion 3a of the container film 3 is set to a large incidence angle of 70 °, the light incident on the container film 3 at the large incidence angle is reflected (including secondary reflection) from the imprint K, the light emitted from the container film 3 is substantially incident on the imaging device 53 and is reflected (including secondary reflection) from the general portion of the cover film 4, and the light emitted from the container film 3 is substantially not incident on the imaging device 53.
Thus, according to the imprint inspection apparatus 31, luminance image data in which the imprint K is brightly displayed can be obtained compared with other portions such as a general portion of the overcoat film 4. Further, by performing binarization processing on the luminance image data obtained in this manner based on a predetermined threshold value δ, the mark K can be detected as a bright portion, and inspection relating to the mark K can be performed.
In particular, according to the present embodiment, the imprint K is detected and inspected by imaging the unexposed surface side (the surface protected by the container film 3) of the cover film 4. The unexposed surface of the stamp K is less likely to be scratched by direct contact with the punch 158 of the imprint apparatus 30, and thus has a rough outer surface and strong light scattering. As a result, the imprint K can be detected more appropriately, and the inspection relating to the imprint K can be performed more appropriately.
Furthermore, in the imprint inspection apparatus 31, since the luminance image data in which the imprint K is brightly displayed and other portions such as the general portion of the cover film 4 are darkly displayed is obtained by setting the incident angle α of the light irradiated from the illumination device 52 to a large incident angle of 70 °, the imprint inspection apparatus can more suitably detect the imprint K without being affected by the print portion such as the mark, character, or pattern printed on the cover film 4 or the foreign matter attached to the outer surface of the flat portion 3a of the container film 3.
In the present embodiment, the imprint inspection step is performed after the end of the imprint step and in a step preceding the sheet pressing step. Thus, the PTP sheet 1 (defective) having a defective imprint can be detected at an earlier stage after the imprint step. Further, the production of the PTP sheet 1 can be stopped at an earlier stage, and the number of defective products can be suppressed.
In the step prior to pressing the PTP sheet 1 from the PTP film 9 in the form of a belt, the position or orientation of the inspection range corresponding to the PTP sheet 1 constituting the inspection object is maintained constant with respect to the imprint inspection device 31 (the illumination device 52 and the imaging device 53) at the time of inspection. Thus, when detecting or inspecting the imprint K, it is not necessary to adjust the position or orientation of the PTP sheet 1 in advance, and inspection can be performed more easily and at higher speed. Further, the inspection accuracy can be further improved.
The present invention is not limited to the description of the above embodiments, and may be implemented as follows, for example. Obviously, other application examples not listed below, and modified examples are of course possible.
(a) Although the above embodiment is embodied in the case where the content is the tablet 5, the type, shape, and the like of the content are not particularly limited, and the content may be, for example, food, electronic components, and the like.
(b) The material of the container film 3 or the cover film 4 is not limited to the above embodiment, and other materials may be used.
For example, in the above embodiment, the container film 3 is formed of a transparent, colorless thermoplastic resin material having optical transparency. The present invention is not limited to this, and the container film 3 may be formed of a transparent material having a light-transmitting color.
In the above embodiment, the overcoat film 4 is formed by laminating aluminum films, but the present invention is not limited to this, and a structure in which the overcoat film is formed of an opaque material (including a type formed of a single aluminum material) having aluminum as a base material and an opaque material having a metal material as a base material may be formed.
(c) The arrangement, number, shape, and the like of the bag portions 2, the small pieces 6, the slits 7 for slitting, and the like in the PTP sheet 1 are not limited to the above-described embodiments. For example, PTP sheets 1 having various arrangements and numbers, such as a type having 3 rows and 12 pockets, may be used.
Further, the slit 7 for cutting may be omitted, or a needle hole may be formed instead of the slit 7 for cutting.
(d) In the above embodiment, although the PTP sheets 1 are produced one at a time in the width direction of the PTP film 9, 2 or 3 or more sheets may be produced simultaneously in the width direction.
In the imprint apparatus 30 for simultaneously manufacturing 2 sheets in the width direction, even when the pressing mechanism 159 is provided at both ends in the width direction of the base mechanism 140 and the elastic mechanism 173 and the like as in the above-described embodiment are omitted, load balance can be obtained and the influence on the imprint formation can be reduced.
(e) The structure of the irradiation mechanism is not limited to the above embodiment. For example, in the above embodiment, the illumination device 52 is a ring-shaped ring lamp that can emit light from all directions.
For example, the configuration may be such that a pair of illuminating devices are provided at a predetermined interval in the transport direction (X-axis direction) of the PTP film 9 and/or a pair of illuminating devices are provided at a predetermined interval in the film width direction (Y-axis direction) of the PTP film 9.
(f) In the illumination device 52 of the above embodiment, the incident angle α of light with respect to the outer surface of the flat portion 3a of the container film 3 is set at a large incident angle of 70 °.
Not limited to this, the incident angle α of the light on the outer surface of the flat portion 3a of the container film 3 may be set to be a large incident angle (for example, any one of 45 ° to 90 °) at which the light reflected from the imprint K and emitted from the container film 3 among the light incident on the container film 3 substantially enters the imaging device 53 and is reflected from the general portion of the overcoat film 4 and the light emitted from the container film 3 substantially does not enter the imaging device 53.
(g) Instead of the above-described embodiment, a configuration may be adopted in which the incident angle α of the light on the outer surface of the flat portion 3a of the container film 3 is set to be reflected from the general portion of the cover film 4 among the light incident on the container film 3, the light emitted from the container film 3 is substantially incident on the imaging device 53 and is reflected from the imprint K, and the light emitted from the container film 3 is substantially not incident on a predetermined small incident angle (for example, any of 0 ° to 30 °) of the imaging device 53.
For example, in the imprint inspection apparatus 31 shown in fig. 14, the light irradiated from the illumination device 52 to the PTP film 9 is configured such that the incident angle (the angle between the optical axis JA at each position in the circumferential direction of the illumination device 52 and the normal direction of the outer surface of the flat portion 3a of the container film 3) α with respect to the outer surface of the flat portion 3a of the container film 3 is set to a small incident angle of 20 °.
In this case, as shown in fig. 15, the light L11, which is irradiated from the illumination device 52 toward the PTP film 9 and reflected by the inclined surface (non-exposed surface) of the seal K on the container film 3 side out of the light L11 and the light L12 incident on the container film 3, does not enter the imaging device 53. On the other hand, the light L12 reflected by the normal portion (imprint non-formation region) of the cover film 4 and emitted from the outer surface of the flat portion 3a of the container film 3 as it is enters the imaging device 53.
Then, since the light reflected from the normal portion of the overcoat film 4 is mainly imaged by the imaging device 53, luminance image data in which the imprint K is displayed locally darker than other portions is obtained.
Further, as shown in fig. 14, by setting the light incident angle α to a small incident angle, the position (optical axis) of the illumination device 52 can be made close to the position (optical axis) of the imaging device 53, and as a result, the expansion of the space in which the illumination device 52 is provided can be suppressed, and the imprint inspection apparatus 31 can be made compact.
(h) The configuration may be such that the 1 st illumination device for irradiating light at a large incident angle and the 2 nd illumination device for irradiating light at a small incident angle are provided with a mechanism for switching between the two (large incident angle irradiation light and small incident angle irradiation light).
Under the condition of this configuration, a configuration may be made wherein the inspection concerning the imprint K is performed based on the luminance image data in which the imprint K is displayed brighter than other portions and the luminance image data in which the imprint K is displayed darker than other portions, by performing the 1 st imaging process of irradiating light from the 1 st illumination device and imaging the PTP film 9 (imprint K) and the 2 nd imaging process of irradiating light from the 2 nd illumination device and imaging the PTP film 9 (imprint K) at different timings. This improves the inspection accuracy.
(i) In the above embodiment, the illumination device 52 is configured to emit white light (visible light). The present invention is not limited to this, and other light (including infrared light and ultraviolet light) such as various monochromatic light having different wavelengths may be irradiated. Preferably, the PTP films 9 are different in material from each other in the container film 3 and the cover film 4, and are irradiated with light for easily detecting the imprint K.
For example, when the container film 3 is formed of a colorless and transparent thermoplastic resin material such as PP or PVC, the container film 3 may be easily irradiated with light (for example, infrared light).
In the above embodiment, the illumination device 52 is configured to emit diffused light. The structure is not limited to this, and a structure for irradiating parallel light may be formed. Since the light and shade are more clear by using the parallel light than in the case of using the diffused light, the imprint K can be easily detected. Further, if a configuration is adopted in which only the specular reflection light (specular reflection portion of the reflection light) of the parallel light reflected from the imprint K is incident on the imaging device 53, the influence of the scattered light (scattering portion) of the parallel light reflected by the general portion of the cover film 4 or the outer surface of the flat portion 3a of the container film 3 is suppressed, and the imprint K can be detected more clearly and easily.
(j) The inspection contents and the inspection method relating to the imprint K are not limited to the above-described embodiments.
For example, in the above embodiment, it is determined whether the thickness of the character of the stamp mark K is appropriate by a known pattern matching method. The method may be, for example, a method of determining whether the thickness of the character of the imprint K is appropriate by another method, or a method of checking the positional relationship between the pocket 2 and the imprint K, the inclination of the imprint K with respect to the pocket 2, or the like.
In the above embodiment, the check frame is set for each character constituting the stamp mark K, but the present invention is not limited to this, and a check frame surrounding the entire stamp mark K (character string) may be set. Obviously, it is also possible to perform imprint inspection without setting an inspection frame.
In the imprint inspection, for example, a character recognition process for recognizing the characters ("a", "B", "C", "0", "1") engraved as the imprint K is performed by a known pattern matching method, and a collation process for collating the character string "ABC 001" of the imprint K recognized by the character recognition process with the lot number "ABC 001" stored in the setting data storage device 76 as the storage means is performed.
With this scheme, it can be checked whether the contents of the stamp K attached to the PTP sheet 1 are proper. Thus, even when a defect occurs in which the lot number of the PTP sheet 1 to be manufactured differs depending on, for example, an attachment error of the punch 158 in the imprint apparatus 30, and the content (lot number) of the imprint K attached to the PTP sheet 1 to be actually manufactured differs, the defect can be found early by the check. Further, based on the result of the check, it is possible to perform an abnormality notification process, a process of stopping the production line, and the like at an early stage.
The "character recognition means" of the present embodiment is configured by the function of the control processing device 54 that performs the character recognition processing, and the "collation means" of the present embodiment is configured by the function of the control processing device 54 that performs the collation processing.
(k) The imprint inspection apparatus 31 of the above embodiment is configured to include only a reflective inspection mechanism including the illumination device 52 and the imaging device 53. Not only this, but the imprint inspection apparatus 31 may also be configured to have a light-transmission type inspection mechanism.
Through setting up the inspection mechanism of printing opacity formula, the defective work that the detectable seal K runs through top facing film 4.
For example, a configuration may be made in which a 2 nd illumination device as a 2 nd illumination mechanism is provided on the lower side (container film 3 side) of the PTP film 9, and a 2 nd imaging device as a 2 nd imaging mechanism is provided on the upper side (cover film 4 side) of the PTP film 9.
Here, the optical axis of the 2 nd illumination device and the optical axis of the 2 nd imaging device are set in the vertical direction (Z-axis direction) which is the normal direction of the outer surface of the flat portion 3a of the container film 3 and the normal direction of the general portion of the cover film 4.
For example, when the entry of the stamp mark K formed on the PTP film 9 is too deep due to a bad situation of the stamp device 30, the cover film 4 may be cut, a slit may be formed in a part of the cover film 4, and a penetrating portion may be printed immediately.
In this case, according to the light transmission type inspection mechanism, the light passing through the stamp penetration portion among the light irradiated from the 2 nd illumination device to the PTP film 9 is imaged by the 2 nd imaging device. On the other hand, the other light does not pass through the stamp penetration portion. Then, in the image data obtained by the 2 nd imaging device, the portion where the through-hole is engraved is displayed brighter than other normal portions.
That is, the control processing device 54 can determine that a slit (a through-engraved portion) is formed in the overcoat film 4 when the brightness of the PTP film 9 is determined based on the image data obtained by the 2 nd imaging device to detect the brightness. Then, the imprint through-portion detection mechanism of the present embodiment is configured by the processing function of the control processing device 54.
Thus, for example, in the above embodiment, although the thickness of the characters of the imprint K is within an appropriate range, a defective product in which the imprint K penetrates the overcoat film 4, or the like, can be detected more reliably, and such a defective product cannot be detected by the reflective inspection means. As a result, the inspection accuracy relating to the inspection of the imprint K can be further improved.
As described in (g) above, when the incident angle α of the light emitted from the illumination device 52 is set to a small incident angle, the 2 nd illumination device may be omitted and the illumination device 53 may also serve as the 2 nd illumination means.
In place of the above configuration, a configuration may be adopted in which the 2 nd imaging device is provided below the PTP film 9 (on the container film 3 side) and the 2 nd illumination device is provided above the PTP film 9 (on the cover film 4 side). In this configuration, the 2 nd imaging device may be omitted, and the imaging device 53 may also serve as the 2 nd imaging means.
It is to be understood that the various light-transmission type inspection means (light-transmission type inspection means including the 2 nd illumination device, the 2 nd imaging device, and the like) may be provided as a separate inspection device without being integrated with the imprint inspection device 31 (reflected light type inspection means including the illumination device 52 and the imaging device 53) of the above embodiment. That is, in the manufacturing process of the PTP sheet 1, the imprint inspection step by the reflective inspection means and the imprint inspection step by the transmissive inspection means may be performed in separate steps (different steps).
(l) In the above embodiment, in order to achieve a strong seal, a structure may be adopted in which a mesh-like ridge is formed on the outer surface of the heating roller 25, the cover film 4 is attached to the container film 3, and at this time, a seal seam is formed on the cover film 4 by strong pressure bonding, although this is not particularly given.
Even when the seal seams are formed in the cover film 4, the seal seams are regularly or periodically repeated in a grid pattern, and therefore, in the case of detecting the imprint K or the like, the influence thereof can be reduced relatively easily and effectively by image processing or the like.
(m) in the above-described embodiment, a scheme is formed in which the imprint inspection step is performed in a step subsequent to the imprint step and in a step preceding to the sheet punching step. However, without being limited thereto, a scheme may be formed in which imprint inspection is performed on the PTP sheet 1 conveyed by the conveyor 39 in a subsequent step of punching the PTP sheet 1 from the PTP film 9.
In this case, instead of the configuration in which the imprint inspection device 31 is provided inside the PTP packaging machine 10 (on-line), the imprint inspection device 31 may be provided as a device for inspecting the PTP sheet 1 by an on-line method separately from the PTP packaging machine 10. In this case, the imprint inspection apparatus 31 may be provided with a transport mechanism capable of transporting the PTP sheet 1.
However, in the case of performing the inspection in an on-line manner, since the position and orientation of the PTP sheet 1 constituting the inspection target are not constant with respect to the imprint inspection apparatus 31, it is necessary to adjust the position and orientation of the PTP sheet 1 in advance when the imprint K is detected or inspected. As a result, there is a risk of a reduction in inspection speed and inspection accuracy.
In recent years, in the field of manufacturing PTP sheets 1, etc., various inspections are required to be speeded up along with the speeding up of production speed. For example, when the PTP packaging machine 10 is subjected to inspection, it is sometimes required to handle 100 or more tablets 5 per second.
Therefore, in order to improve productivity, it is preferable to perform inspection on line.
(n) in the case where, as described in (m), a scheme is formed for performing imprint inspection of the PTP sheet 1 conveyed by the conveyor 39 in the subsequent step of pressing the PTP sheet 1 from the PTP film 9, a scheme may be formed in which not only the imprint inspection by the imprint inspection device 31 (reflective light type inspection means) of the above embodiment but also the imprint inspection by the transmissive light type inspection means as described in (k) above is performed.
For example, the belt member of the conveyor 39 is formed by the light-transmitting member, and the slit (the passing-through portion) can be detected in the cover film 4 formed on the PTP sheet 1 by providing an irradiation mechanism capable of irradiating the PTP sheet 1 with predetermined light from the lower side of the conveyor 39 and by imaging the light passing through the PTP sheet 1 by an imaging device provided above.
(o) in the above embodiment, when the brightness of the general portion of the cover film 4 or the imprint K is determined, the process of binarizing the luminance image data is performed, but the present invention is not limited to this, and a scheme of determining the brightness of the imprint K or the like by measuring the luminance, performing the multi-valued process, the difference process, or the like may be used.
(p) may be a scheme in which imprint inspection is performed by the imprint inspection apparatus 31 described above, and other inspections are performed simultaneously. That is, the imprint inspection apparatus 31 may be configured to also serve as an inspection apparatus for detecting an abnormality other than the imprint formation failure.
For example, inspection of foreign matter adhering to the outer surface of the flat portion 3a of the container film 3, inspection of foreign matter located between the container film 3 and the cover film 4, inspection of foreign matter adhering to the tablet 5 received in the pocket 2, and the like may be performed simultaneously with the imprint inspection.
Here, for example, in a case where the illumination device 52 irradiates light at a large incident angle, since the imprint K is displayed more brightly than other portions such as a general portion of the overcoat film 4 with respect to the image data obtained by the imaging device 53, a plurality of different threshold values such as a threshold value for foreign matter detection are set by the threshold value for imprint detection, and binarization processing is performed, so that the foreign matter is detected as the foreign matter, differently from the imprint K.
On the other hand, in the case where the illumination device 52 irradiates light at a small incident angle, the imprint K is displayed darker than other portions such as a general portion of the overcoat film 4 with respect to the image data obtained by the imaging device 53, and therefore, other dark portions excluding the dark portions corresponding to the imprint K by, for example, mask processing can be detected as foreign substances.
Description of reference numerals:
reference numeral 1 denotes a PTP slice;
reference numeral 2 denotes a bag portion;
reference numeral 3 denotes a container film;
reference numeral 3a denotes a flat portion;
reference numeral 4 denotes a mask film;
reference numeral 5 denotes a tablet;
reference numeral 8 denotes a label portion;
reference numeral 9 denotes a PTP membrane;
reference numeral 10 denotes a PTP packaging machine;
reference numeral 30 denotes an imprint apparatus;
reference numeral 31 denotes an imprint inspection apparatus;
reference numeral 52 denotes a lighting device;
reference numeral 53 denotes an image pickup device;
reference numeral 54 denotes a control processing device;
reference numeral 74 denotes an image data storage device;
reference numeral 76 denotes a setting data storage device;
reference numeral 158 denotes a male die;
symbol K represents engraving;
symbol α denotes the angle of incidence.

Claims (8)

1. An inspection apparatus for manufacturing a PTP sheet in which a predetermined content is received in a bag portion formed in a translucent container film, a cover film is attached to an inner surface of a flat portion of the container film so as to close the bag portion, and an imprint is provided at a predetermined position of the cover film attached to the inner surface of the flat portion of the container film, the inspection apparatus comprising:
an irradiation mechanism which can cross the container film from the outer surface side of the container film and irradiate the cover film with predetermined light;
an imaging unit that can image the mask film irradiated with the predetermined light by passing over the container film from an outer surface side of the container film;
an image processing unit that processes an image signal output from the imaging unit;
in the irradiation mechanism, an incident angle of the predetermined light on an outer surface of the flat portion of the container film is set to a predetermined angle at which light reflected from one of a general portion of the cover film and the imprint and emitted from the container film among the light incident on the container film is substantially incident on the imaging mechanism and reflected from the other, and light emitted from the container film is substantially not incident on the imaging mechanism;
the image processing means includes:
an imprint detection unit capable of detecting the imprint by determining a light/dark state of the cover film based on image data obtained from the image signal;
and an inspection unit capable of performing an inspection related to the imprint based on a detection result of the imprint detection unit.
2. The inspection apparatus according to claim 1, wherein:
in the irradiation mechanism, an incident angle of the predetermined light on an outer surface of the flat portion of the container film is set to a large incident angle at which light reflected from the imprint and emitted from the container film among the light incident on the container film substantially enters the imaging mechanism and is reflected from a general portion of the cover film and light emitted from the container film substantially does not enter the imaging mechanism;
the imprint inspection means is configured to detect a bright portion of the image data as the imprint.
3. The inspection apparatus according to claim 1, wherein:
in the irradiation mechanism, an incident angle of the predetermined light on an outer surface of the flat portion of the container film is set to a small incident angle at which light reflected from a general portion of the cover film and emitted from the container film among the light incident on the container film substantially enters the imaging mechanism and light reflected from the imprint and emitted from the container film substantially does not enter the imaging mechanism;
the imprint inspection means is configured to detect a dark portion of the image data as the imprint.
4. The inspection apparatus according to any one of claims 1 to 3, wherein the inspection mechanism includes:
a character recognition unit configured to recognize an engraved character as the imprint based on a detection result of the imprint detection unit;
and a checking means for checking the engraved character recognized by the character recognition means with a character stored in a predetermined storage means in advance.
5. An inspection apparatus according to any one of claims 1 to 4, characterized in that it comprises:
a 2 nd irradiation mechanism capable of irradiating a film body in which the cover film is attached to the container film with a predetermined light;
a 2 nd imaging unit which is provided on the opposite side of the 2 nd irradiation unit via the film body and is capable of imaging light passing through the film body;
the image processing means includes a cut-through detection means capable of detecting a cut-through penetrating the overcoat film by determining the brightness of the film body based on image data obtained from the image signal output from the 2-camera means.
6. A PTP packaging machine comprising an inspection apparatus according to any one of claims 1 to 5.
7. A method for manufacturing a PTP sheet, wherein a cover film is attached to an inner surface of a flat portion of a container film so as to close a pocket portion formed in the container film having light permeability, and a predetermined content is received in the pocket portion, the method comprising:
a bag portion forming step of forming the bag portion on the container film conveyed in a belt shape;
a filling step of filling the bag with the content;
a mounting step of mounting a band-shaped cover film on the container film having the contents accommodated in a bag portion so as to close the bag portion;
an imprint step of providing an imprint at a predetermined position on the cover film side in a band-shaped film body in which the cover film is attached to the container film;
a cutting step of cutting the PTP sheet from the band-shaped film body;
and an imprint inspection step of performing an inspection involving the aforementioned imprint.
8. The method of manufacturing a PTP sheet according to claim 7, characterized in that the imprint inspection step includes:
an irradiation step of irradiating the cover film with a predetermined light from the outer surface side of the container film across the container film;
an imaging step of imaging the cover film irradiated with the predetermined light from an outer surface side of the container film over the container film;
an imprint detection step of detecting the imprint by determining a brightness of the mask film based on the image data obtained in the image pickup step;
in the irradiating step, the predetermined light incident angle on the outer surface of the flat portion of the container film is set to an angle at which the light incident on the container film is reflected from one of the normal portion of the cover film and the imprint, the light emitted from the container film is substantially incident on the imaging means and reflected from the other, and the light emitted from the container film is substantially not incident on the imaging means.
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