Method for manufacturing blister sheet and blister packaging machine

Abstract

To provide a method for manufacturing a blister sheet etc. that can properly exert the function of a registration mark and can effectively reduce scrap generation.SOLUTION: A PTP sheet as a blister sheet is produced by punching out a PTP film 6 obtained by attaching a cover film 4 to a container film along predetermined punching lines Rp. Registration marks 7 are provided at predetermined intervals on the cover film 4, and the cover film 4 is attached to the container film so that at least a portion of the registration marks 7 is located in a triangular area TA surrounded with two curved lines Rw that are positioned to sandwich the scrap portion of the PTP film 6 that remains after the PTP sheet is obtained, and an extension line Es of the straight line Rs.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a blister sheet in which a pocket portion is filled with contents such as tablets, and a blister packaging machine for manufacturing the blister sheet.

Background Art

[0002] A blister sheet includes a container film formed with pocket portions filled with contents such as tablets, and a cover film attached to the container film so as to seal the opening side of the pocket portions. Further, the blister sheet (cover film) may be provided with a printing portion for displaying information related to the contents and the like.

[0003] A blister packaging machine for manufacturing a blister sheet includes a pocket portion forming means, a filling means, an attaching means, a punching means, and the like. The pocket portion forming means forms a plurality of pocket portions in the container film, the filling means fills the pocket portions with contents, and the attaching means attaches the cover film to the container film. Further, the punching means punches a strip-shaped blister film with the cover film attached to the container film along a punching line corresponding to the outer edge shape of the blister sheet. The punched portion in the blister film becomes the blister sheet.

[0004] In addition, registration marks (registration marks) as marks may be provided at regular intervals in a strip-shaped region located on the edge side in the width direction of the blister film and extending along the longitudinal direction of the blister film (see, for example, Patent Document 1, etc.). The registration marks are used, for example, to adjust the attachment position of the cover film to the container film. By adjusting the attachment position, a printing portion can be provided at an appropriate position on the blister sheet.

[0005] Incidentally, considering the appearance of the blister sheet as a product, it is preferable that the registration mark remains hardly or not at all on the blister sheet. In this regard, in Patent Document 1 mentioned above, the punching line is adjusted to a position that does not cover the strip-shaped region of the fixed width where the registration mark is provided, so that the registration mark does not remain on the blister sheet. Incidentally, the strip-shaped region remaining after punching is discarded as scrap.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Incidentally, in recent years, from the viewpoints of resource protection and cost reduction, it has been particularly required to reduce scrap as much as possible.

[0008] In this regard, if the width of the blister film is simply made small for reducing scrap while maintaining the size of the blister sheet as a product, the punching line will hit the registration mark. As a result, the registration mark may remain on the blister sheet, and the appearance of the blister sheet may deteriorate. On the other hand, if the size of the registration mark is made small so that the punching line does not hit the registration mark, there may be an obstacle to the detection of the registration mark, and the function of the registration mark as a mark may not be properly fulfilled.

[0009] The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing a blister sheet that can properly exhibit the function of the registration mark and can effectively reduce scrap.

Means for Solving the Problems

[0010] Hereinafter, each means suitable for solving the above object will be described separately, and the effects specific to the corresponding means will be appended as necessary.

[0011] Means 1. A method for manufacturing a blister sheet for manufacturing a blister sheet having a rectangular shape in plan view with rounded corners by attaching a strip-shaped cover film so as to close a pocket portion formed in a strip-shaped container film to form a strip-shaped blister film, and punching the blister film, comprising: An attaching step of attaching the cover film to the container film; A punching step of obtaining the blister sheet by punching the blister film with a punching line including a pair of parallel straight lines extending along the longitudinal direction of the blister film, a pair of parallel orthogonal lines extending along the width direction of the blister film, and curved lines that connect the straight lines and the orthogonal lines and correspond to the four corners of the blister sheet, and having a certain positional relationship with respect to the pocket portion. The cover film has a plurality of registration marks provided at predetermined intervals in a strip-shaped region having a certain width extending along the longitudinal direction of the blister film. In the attaching step, the registration marks are used to In the blister film after attachment, the central position of the registration marks along the longitudinal direction of the blister film coincides with the position of the orthogonal line in the longitudinal direction of the blister film. The entire registration marks are located at a portion that remains as a scrap portion after obtaining the blister sheet in the blister film. Furthermore, at least a part of the registration marks is located in a triangular region surrounded by the two curved lines having a positional relationship of sandwiching the scrap portion along the longitudinal direction of the blister film and the extension line of the straight line. In such a manner, the cover film is attached to the container film, which is a feature of the method for manufacturing a blister sheet.

[0012] According to the above-described means 1, the entire registration mark is located at a site that remains as a scrap portion in the blister film, and further, at least a part of the registration mark is located in a triangular region surrounded by two curved lines and an extension line of a straight line, so that the cover film is attached to the container film. Therefore, while more surely preventing the registration mark from remaining on the obtained blister sheet, a punching line can be made to enter between the registration marks in a strip-shaped region (region where the registration mark is provided) having a constant width extending along the longitudinal direction of the blister film. Thereby, it is possible to more surely prevent the appearance of the blister sheet from deteriorating due to the remaining of the registration mark, and it is possible to effectively reduce the scrap. In addition, since it is not necessary to make the size of the registration mark excessively small for scrap reduction, the function of the registration mark can be appropriately exhibited.

[0013] In addition, in the attaching step, (1) the central position of the registration mark and the position of the orthogonal line coincide with each other in the longitudinal direction of the blister film, (2) the entire registration mark is located at a site that remains as a scrap portion in the blister film, and (3) at least a part of the registration mark is located in a triangular region. With these as the goals, the cover film is attached to the container film. Therefore, depending on the state of the cover film (for example, meandering of the cover film), there may be a slight variation in the relative positional relationship between the registration mark and the punching line in the blister film after attachment. This is the same also in means 5 described later.

[0014] Means 2. In the attaching step, in the blister film after attachment, the relative positions of the registration mark and the orthogonal line may vary. While the central position of the registration mark along the longitudinal direction of the blister film coincides with the position of the orthogonal line in the longitudinal direction of the blister film, assuming the state where the registration mark is closest to the orthogonal line due to the variation in the relative positions of the registration mark and the orthogonal line, when the registration mark is virtually moved from one curved line side to the other curved line side along the longitudinal direction of the blister film between the two curved lines sandwiching the registration mark, the allowable width, which is the maximum movement distance of the registration mark, is defined as Lw (mm). Let the width of the registration mark along the longitudinal direction of the blister film be Lm (mm). When the allowable range regarding the displacement of the registration mark along the longitudinal direction of the blister film is δ (mm), In the attaching step, even when the registration mark is in the state closest to the orthogonal line, the registration mark is provided at a position satisfying Lw ≥ Lm + 2δ, and the cover film is attached to the container film. This is the manufacturing method of the blister sheet according to means 1.

[0015] According to the above means 2, in the attaching step, even when the registration mark is in the state closest to the orthogonal line, the registration mark is provided (aiming to be provided) at a position satisfying Lw ≥ Lm + 2δ, and the cover film is attached to the container film. Therefore, due to the meandering of the cover film or the like, in the blister film after attachment, even if the registration mark is closest to the orthogonal line and is displaced by δ along the longitudinal direction of the blister film (that is, the maximum displacement within the allowable range occurs), it is possible to prevent the registration mark from being caught by the punching line. As a result, it is possible to more reliably prevent the registration mark from remaining on the blister sheet, and effectively suppress the deterioration of the appearance of the blister sheet due to the presence of the registration mark.

[0016] Means 3. The registration mark has an intermediate-side registration mark located on the intermediate side in the width direction of the blister film. The blister film is configured such that the sheet corresponding portions that become the blister sheet by the punching process are arranged along the longitudinal direction of the blister film, and a plurality of rows of the sheet corresponding portions are provided. In the attaching step, the middle-side registration mark is positioned so as to extend from the triangular region related to one of two adjacent rows of the sheet corresponding portions to the triangular region related to the other of the two rows of the sheet corresponding portions, and the cover film is attached to the container film. The method for manufacturing a blister sheet according to means 1, characterized in that.

[0017] According to the above means 3, the length of the middle-side registration mark along the width direction of the blister film can be made relatively large. Therefore, the detection of the middle-side registration mark becomes easy, and the function of the registration mark can be more appropriately exhibited.

[0018] Means 4. The registration mark has a one-end-side registration mark located on one end side in the width direction of the blister film and the other-end-side registration mark located on the other end side in the width direction of the blister film. In the attaching step, the attaching position of the cover film to the container film is adjusted by using both the one-end-side registration mark and the other-end-side registration mark. The method for manufacturing a blister sheet according to means 1, characterized in that.

[0019] In the attachment process, it is conceivable to provide a registration mark only on one end side in the width direction of the blister film and adjust the attachment position of the cover film to the container film using only this registration mark. However, in this case, if the cover film is slightly inclined with respect to the container film due to meandering of the cover film or the like (when the longitudinal direction of the cover film is slightly inclined with respect to the longitudinal direction of the container film), there is a possibility that the amount of misalignment of the cover film with respect to the container film becomes relatively large on the other end side in the width direction where the registration mark does not exist. As a result, for example, there is a possibility that problems caused by the inclination of the cover film with respect to the container film, such as the position of the printed portion on the blister film being displaced relatively greatly from the proper position, may occur.

[0020] In this regard, according to the above means 4, the attachment position of the cover film to the container film is adjusted using both the one - end - side registration mark located on one end side in the width direction of the blister film and the other - end - side registration mark located on the other end side in the width direction of the blister film. Therefore, even when the cover film is slightly inclined with respect to the container film, the amount of misalignment of the cover film with respect to the container film can be made relatively small on both the one - end side and the other - end side in the width direction. As a result, it is possible to effectively suppress the occurrence of problems caused by the inclination of the cover film with respect to the container film.

[0021] A blister packaging machine for manufacturing a blister sheet having a rectangular shape in plan view with rounded corners by attaching a strip - shaped cover film so as to close the pocket portions formed in the strip - shaped container film to form a strip - shaped blister film and then punching out the blister film, comprising: attachment means for attaching the cover film to the container film; A pair of parallel straight lines extending along the longitudinal direction of the blister film, a pair of parallel orthogonal lines extending along the width direction of the blister film, and a curved line that connects the straight line and the orthogonal line and is an arc-shaped line corresponding to the four corners of the blister sheet. The blister film is punched by a punching line having a certain positional relationship with respect to the pocket portion to obtain the blister sheet, and punching means is provided. The cover film has a plurality of registration marks located at predetermined intervals in a strip-shaped region having a constant width extending along the longitudinal direction of the blister film. The attaching means utilizes the registration marks. In the blister film after attachment, the central position of the registration mark along the longitudinal direction of the blister film coincides with the position of the orthogonal line in the longitudinal direction of the blister film. The entire registration mark is located at a site that remains as a scrap portion after obtaining the blister sheet in the blister film. Furthermore, at least a part of the registration mark is located in a triangular region surrounded by two curved lines and an extension line of the straight line in a positional relationship that sandwiches the scrap portion along the longitudinal direction of the blister film. In this way, the blister packaging machine is configured to attach the cover film to the container film.

[0022] According to the above means 5, the same operational effects as those of the above means 1 are achieved.

[0023] Means 6. In the blister film obtained by the attaching means, the relative positions of the registration mark and the orthogonal line may vary. While the central position of the registration mark along the longitudinal direction of the blister film coincides with the position of the orthogonal line in the longitudinal direction of the blister film, assuming the state where the registration mark is closest to the orthogonal line due to the variation in the relative positions of the registration mark and the orthogonal line, when the registration mark is virtually moved from one curved line side to the other curved line side along the longitudinal direction of the blister film between the two curved lines sandwiching the registration mark, the allowable width, which is the maximum movement distance of the registration mark, is defined as Lw (mm). Let the width of the registration mark along the longitudinal direction of the blister film be Lm (mm). When the allowable range regarding the misalignment of the registration mark along the longitudinal direction of the blister film is δ (mm), The attaching means is configured such that, even when the registration mark is in the state closest to the orthogonal line, the registration mark is provided at a position satisfying Lw ≧ Lm + 2δ, and the cover film is attached to the container film. The blister packaging machine according to means 5, characterized in that.

[0024] According to the above means 6, the same operational effects as those of the above means 2 are achieved.

[0025] Means 7. The registration mark has an intermediate-side registration mark located on the intermediate side in the width direction of the blister film. The blister film is configured such that the sheet corresponding portions that become the blister sheets by punching of the punching means are arranged along the longitudinal direction of the blister film, and a plurality of rows of the sheet corresponding portions are provided. The attaching means is configured such that the intermediate-side registration mark is positioned from the triangular region related to one of the two adjacent rows of the sheet corresponding portions to the triangular region related to the other of the two rows of the sheet corresponding portions, and the cover film is attached to the container film. The blister packaging machine according to means 5, characterized in that.

[0026] According to the above-mentioned means 7, the same operational effects as those of the above-mentioned means 3 are achieved.

[0027] Means 8. The registration mark has a one-end-side registration mark located on one end side in the width direction of the blister film and a the other-end-side registration mark located on the other end side in the width direction of the blister film, The attaching means is configured to be able to adjust the attaching position of the cover film to the container film by using both the one-end-side registration mark and the other-end-side registration mark, and is characterized in that it is the blister packaging machine according to means 5.

[0028] According to the above-mentioned means 8, the same operational effects as those of the above-mentioned means 4 are achieved.

[0029] In addition, the technical matters related to the above-mentioned respective means may be appropriately combined. Therefore, for example, the technical matters related to the above-mentioned means 3 or 4 may be combined with the technical matters related to the above-mentioned means 2. Also, for example, the technical matters related to the above-mentioned means 7 or 8 may be combined with the technical matters related to the above-mentioned means 6.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0031] Hereinafter, an embodiment will be described with reference to the drawings. First, the configuration of the PTP sheet as the "blister sheet" will be described in detail.

[0032] As shown in FIGS. 1 and 2, the PTP sheet 1 has a container film 3 provided with a plurality of pocket portions 2 and a cover film 4 attached to the container film 3 so as to close the pocket portions 2.

[0033] The container film 3 is made of transparent or translucent polypropylene (PP) or polyvinyl chloride (PVC) and has light transmissivity. Note that the material of the container film 3 may be appropriately changed.

[0034] On the other hand, the cover film 4 is made of thin aluminum (aluminum foil) (for example, about 15 to 20 μm). In the present embodiment, the cover film 4 is made of, for example, an aluminum foil with a sealant made of a predetermined resin or the like applied to the surface.

[0035] Also, on the surface of the cover film 4 opposite to the pocket portion 2 (i.e., the back surface of the PTP sheet 1), a printing portion 8 composed of information such as a barcode is provided (see FIG. 3). In the present embodiment, the printing portion 8 is located at the uppermost portion (tag portion) of the PTP sheet 1 where the pocket portion 2 is not formed, but the position of the printing portion 8 may be changed as appropriate (for example, the printing portion 8 may be provided at a position corresponding to each pocket portion 2). Note that the printing portion 8 is not limited to code information such as a barcode, and may be characters, numbers, figures, or the like.

[0036] The PTP sheet 1 is formed in a rectangular shape in plan view with rounded corners at its four corners. On the PTP sheet 1, two rows of pocket rows each composed of three pocket portions 2 arranged along the long side direction are formed in the short side direction. That is, a total of six pocket portions 2 are formed. One tablet 5 as the "contents" is accommodated in each pocket portion 2.

[0037] The PTP sheet 1 is manufactured by punching a strip-shaped PTP film 6 (see FIG. 4) formed from a strip-shaped container film 3 and a strip-shaped cover film 4 into a sheet shape. In the present embodiment, the PTP film 6 corresponds to a "blister film".

[0038] As shown in FIG. 4, in the PTP film 6, sheet corresponding portions 101, which are portions that become the PTP sheet 1 by punching of a sheet punching device 37 described later, are arranged along the longitudinal direction of the blister film, and a plurality of (two rows in the present embodiment) rows of the sheet corresponding portions 101 are provided.

[0039] Furthermore, registration marks 7 are pre-printed on the strip-shaped cover film 4 constituting the PTP film 6.

[0040] The registration marks 7 are rectangular in plan view, and a plurality of them are provided at equal intervals along the longitudinal direction of the PTP film 6. The registration marks 7 are printed on the surface of the cover film 4 opposite to the pocket portion 2 and have a certain positional relationship with the printing portion 8.

[0041] In addition, in the present embodiment, as the registration marks 7, a left registration mark 7a, a right registration mark 7b, and a center registration mark 7c are provided.

[0042] The left registration mark 7a is located on one edge side in the width direction of the PTP film 6, and is provided in a strip-shaped region LA having a constant width extending in the longitudinal direction of the PTP film 6 at one end side in the width direction of the PTP film 6. The right registration mark 7b is located on the other end side in the width direction of the PTP film 6, and is provided in a strip-shaped region RA having a constant width extending in the longitudinal direction of the PTP film 6 at the other end side in the width direction of the PTP film 6. The center registration mark 7c is located on the center side in the width direction of the PTP film 6, and is provided in a strip-shaped region CA having a constant width extending in the longitudinal direction of the PTP film 6 at the center side in the width direction of the PTP film 6. For the sake of illustration, in FIG. 4 and the like, scatter patterns are attached to the regions LA, RA, and CA. In the present embodiment, the left registration mark 7a constitutes the "one-end-side registration mark", the right registration mark 7b constitutes the "other-end-side registration mark", and the center registration mark 7c constitutes the "intermediate-side registration mark".

[0043] Next, a schematic configuration of the PTP packaging machine 10 for manufacturing the above PTP sheet 1 will be described. In the present embodiment, the PTP packaging machine 10 corresponds to a "blister packaging machine".

[0044] As shown in FIG. 5, at the most upstream side of the PTP packaging machine 10, the raw sheet of the strip-shaped container film 3 is wound in a roll shape. The leading end side of the container film 3 wound in a roll shape is guided by a guide roll 13. The container film 3 is mounted on an intermittent feed roll 14 on the downstream side of the guide roll 13. The intermittent feed roll 14 is connected to a motor that rotates intermittently, and intermittently conveys the container film 3.

[0045] Between the guide roll 13 and the intermittent feed roll 14, a heating device 15 and a pocket forming device 16 are disposed in this order along the transport path of the container film 3. Then, after the container film 3 is heated by the heating device 15 and becomes relatively flexible, a plurality of pockets 2 are formed at predetermined positions in the container film 3 by the pocket forming device 16. The pockets 2 are formed during intervals between transport operations of the container film 3 by the intermittent feed roll 14.

[0046] The container film 3 sent out from the intermittent feed roll 14 is wrapped around a tension roll 18 and a guide roll 19 in that order. The tension roll 18 pulls the container film 3 toward the tension side by elastic force, preventing the container film 3 from slackening due to differences in the conveying operations between the intermittent feed roll 14 and a film receiving roll 24 (described later), thereby keeping the container film 3 in a constantly tensed state.

[0047] Between the guide roll 19 and a sealing device 23 (particularly a film receiving roll 24) described later, a filling device 21 and an inspection device 22 are disposed in this order along the transport path of the container film 3.

[0048] The filling device 21 fills each pocket 2 with tablets 5, for example, by opening a shutter at predetermined intervals to allow the tablets 5 to fall freely. The inspection device 22 inspects, for example, whether the tablets 5 are securely filled in each pocket 2, whether there are any abnormalities in the tablets 5, and whether there is any foreign matter mixed into the pocket 2.

[0049] Downstream of the guide roll 19, the container film 3 is transported toward a sealing device 23. In this embodiment, the sealing device 23 constitutes the "attaching means." The sealing device 23 includes a film receiving roll 24, a heating roll 25, and a position adjustment device 26. The position adjustment device 26 will be described later.

[0050] The film receiving roll 24 is provided with a recess 24a for accommodating the pocket portion 2 of the container film 3 and is connected to a motor that rotates at a constant speed. When the motor operates with the pocket portion 2 accommodated in the recess 24a, the film receiving roll 24 conveys the container film 3 continuously and at a constant speed.

[0051] On the other hand, the original roll of the cover film 4 formed in a strip shape is wound in a roll shape on the most upstream side. The leading end of the cover film 4 wound in a roll shape is guided by a guide roll 27 toward the position adjusting device 26 and the heating roll 25. In addition, registration marks 7 and a printing portion 8 are provided in advance on the cover film 4 drawn out from the original roll, and the interval between the central positions of the registration marks 7 along the longitudinal direction of the cover film 4 is slightly smaller than the width of one PTP sheet 1.

[0052] The heating roll 25 can be pressed against the film receiving roll 24, and the container film 3 and the cover film 4 are fed between the two rolls 24 and 25. When the container film 3 and the cover film 4 pass between the two rolls 24 and 25 in a heat-pressed state, the cover film 4 is attached to the container film 3, and the pocket portion 2 is closed by the cover film 4. Thereby, a strip-shaped PTP film 6 in which the tablets 5 are accommodated in each pocket portion 2 is manufactured. In the present embodiment, the step of attaching the cover film 4 to the container film 3 by the sealing device 23 (particularly the film receiving roll 24 and the heating roll 25) corresponds to the "attachment step". Although details will be described later, due to the function of the position adjusting device 26, the obtained PTP film 6 is provided with the registration marks 7 and the printing portion 8 in an appropriate relative positional relationship with respect to the pocket portion 2.

[0053] The PTP film 6 sent out from the film receiving roll 24 is mounted in the order of the tension roll 28 and the intermittent feed roll 29. Since the intermittent feed roll 29 is connected to a motor that rotates intermittently, the PTP film 6 is conveyed intermittently. The tension roll 28 is in a state of pulling the PTP film 6 toward the side that tensions it by elastic force, preventing the slack of the PTP film 6 due to the difference in the conveying operations between the film receiving roll 24 and the intermittent feed roll 29 and keeping the PTP film 6 in a constantly tensioned state.

[0054] The PTP film 6 sent out from the intermittent feed roll 29 is mounted in the order of the tension roll 31 and the intermittent feed roll 32. Since the intermittent feed roll 32 is connected to a motor that rotates intermittently, the PTP film 6 is conveyed intermittently. The tension roll 31 is in a state of pulling the PTP film 6 toward the side that tensions it by elastic force, preventing the slack of the PTP film 6 between the intermittent feed rolls 29 and 32.

[0055] Between the intermittent feed roll 29 and the tension roll 31, along the conveyance path of the PTP film 6, a slit forming device 33 and a printing device 34 are arranged in order. The slit forming device 33 has a function of forming a separating slit at a predetermined position of the PTP film 6. The printing device 34 has a function of attaching a print at a predetermined position of the PTP film 6. In addition, in FIG. 1 and the like, the illustration of the separating slit and the print is omitted.

[0056] The PTP film 6 sent out from the intermittent feed roll 32 is mounted in the order of the tension roll 35 and the continuous feed roll 36 on its downstream side. Between the intermittent feed roll 32 and the tension roll 35, a sheet punching device 37 is arranged along the conveyance path of the PTP film 6.

[0057] The sheet punching device 37 has a function of punching the outer edge of the PTP film 6 in units of the PTP sheet 1, that is, a function of separating the PTP sheet 1 from the PTP film 6. In the present embodiment, the sheet punching device 37 constitutes the "punching means". Further, the process of punching the PTP film 6 by the sheet punching device 37 corresponds to the "punching process".

[0058] The sheet punching device 37 is set to punch the PTP film 6 at a rounded rectangular punching line Rp (see FIG. 6. Note that the printing unit 8 is not shown in FIG. 6 etc.) corresponding to the outer edge of the sheet corresponding portion 101. By punching the PTP film 6, the PTP sheet 1 is obtained. However, the punching line Rp is the punching position when the PTP film 6 is punched at a regular position without displacement, that is, the punching position in design (ideal punching position).

[0059] The punching line Rp has a fixed positional relationship with respect to the pocket portion 2, and is composed of a pair of parallel straight lines Rs extending along the longitudinal direction of the PTP film 6, a pair of parallel orthogonal lines Rc extending in the width direction of the PTP film 6, and four curved lines Rw connecting the straight lines Rs and the orthogonal lines Rc, which are lines corresponding to the four corners of the PTP sheet 1. In the present embodiment, the sheet punching device 37 is set to punch the PTP film 6 at the punching line Rp related to the sheet corresponding portions 101 for two sheets arranged in the width direction of the PTP film 6 by one punching operation. Therefore, two PTP sheets 1 are obtained by one punching operation of the sheet punching device 37.

[0060] The PTP sheet 1 obtained by the sheet punching device 37 is conveyed by the conveyor 39 and temporarily stored in the hopper 40 for finished products. However, when a defective determination is made by the inspection device 22, the PTP sheet 1 related to this defective determination is not sent to the hopper 40 for finished products, but is separately discharged by a defective sheet discharging mechanism (not shown).

[0061] A cutting device 41 is disposed downstream of the continuous feed roll 36. After being punched by the sheet punching device 37, the scrap portion 42 remaining is guided by the tension roll 35 and the continuous feed roll 36 and then led to the cutting device 41. The cutting device 41 cuts the scrap portion 42 into a predetermined size. The cut scrap portion 42 is stored in the scrap hopper 43 and then separately disposed of.

[0062] Next, the position adjusting device 26 will be described. The position adjusting device 26 has a function of stretching the cover film 4 in order to adjust the attachment position of the cover film 4 with respect to the container film 3 along the longitudinal direction of both films 3 and 4. As shown in FIG. 8, the position adjusting device 26 includes a step roller 51, a stretching sensor 52, a stretching device 53, a tension device 54, a post-stretching sensor 55, a position detection encoder 56, and a control device 57.

[0063] The step roller 51 is for applying a tension T1 to the cover film 4 in a direction opposite to its conveyance direction. The step roller 51 includes a pair of support rollers 51a and a weight roller 51b around which the cover film 4 positioned between these support rollers 51a is hung. The weight roller 51b is configured to be movable in the vertical direction and has a function of pulling the cover film 4 downward by its own weight. By this function, a tension T1 in a direction opposite to the conveyance direction of the cover film 4 is applied.

[0064] The stretching sensor 52 is provided downstream of the step roller 51 and detects the registration marks 7 provided on the cover film 4. In the present embodiment, the stretching sensor 52 is configured to be able to detect all of the left registration mark 7a, the right registration mark 7b, and the center registration mark 7c. The detection result by the stretching sensor 52 is sent to the control device 57.

[0065] The stretching device 53 is provided on the downstream side of the stretching sensor 52 and is for stretching the cover film 4 along its longitudinal direction. The stretching device 53 includes a feeding roller 53a that feeds the cover film 4 toward the downstream side (the side of the film receiving roller 24 and the heating roller 25), and a stretching roller 53b that is located on the upstream side of the feeding roller 53a and stretches the cover film 4 between the feeding roller 53a and itself. In the present embodiment, the feeding roller 53a is driven by a feeding servo motor 53c, and the stretching roller 53b is driven by a stretching servo motor 53d. Both servo motors 53c and 53d are controlled by the control device 57.

[0066] The tension device 54 includes a first tension roller 54a provided on the downstream side of the feeding roller 53a, a second tension roller 54b provided on the upstream side of the stretching roller 53b, and a sliding portion 54c that supports both tension rollers 54a and 54b while maintaining a constant interval between these tension rollers 54a and 54b.

[0067] The sliding portion 54c slides on the rail 54d due to the balance of the tensions acting in opposite directions on the upstream side and the downstream side. Specifically, on the upstream side of the stretching roller 53b, a tension T1 acts on the cover film 4, while on the downstream side of the feeding roller 53a, as the cover film 4 is conveyed by the film receiving roller 24 and the heating roller 25, a tension T2 in the same direction as the conveying direction acts on the cover film 4. Therefore, when the tension T1 is greater than the tension T2, the sliding portion 54c slides on the rail 54d toward the upstream side (right direction in FIG. 8) in the conveying direction of the cover film 4, and when the tension T1 is smaller than the tension T2, it slides toward the downstream side (left direction in FIG. 8) in the conveying direction. Accordingly, when the length of the cover film 4 fed out from the feeding roller 53a is greater than the length of the cover film 4 sent by the film receiving roller 24 and the heating roller 25, due to the action of the tension T1, the sliding portion 54c slides toward the upstream side (right direction in FIG. 8) in the conveying direction of the cover film 4. On the other hand, when the length of the cover film 4 fed out from the feeding roller 53a is smaller than the length of the cover film 4 sent by the film receiving roller 24 and the heating roller 25, due to the action of the tension T2, the sliding portion 54c slides toward the downstream side (left direction in FIG. 8) in the conveying direction of the cover film 4.

[0068] Also, a predetermined rack 54e is integrally attached to the sliding portion 54c, and a pinion 54f is meshed with the rack 54e. Thereby, the pinion 54f rotates due to the position change of the sliding portion 54c. And the rotation angle of the pinion 54f is sent from the tension encoder 54g to the control device 57 as the position information of the sliding portion 54c.

[0069] The post-stretching sensor 55 is provided on the downstream side of the first tension roller 54a, and like the stretching sensor 52, detects all of the left registration mark 7a, the right registration mark 7b, and the center registration mark 7c. The detection result by the post-stretching sensor 55 is sent to the control device 57.

[0070] The position detection encoder 56 is provided corresponding to the film receiving roll 24, and outputs the position information of the container film 3 at the timing when the stretching sensor 52 detects the registration mark 7 and at the timing when the post-stretching sensor 55 detects the registration mark 7 to the control device 57. In the present embodiment, the position detection encoder 56 outputs the rotation amount (i.e., the rotation position) from a predetermined reference position of the film receiving roll 24 as the position information of the container film 3. Note that, instead of the rotation amount, a configuration may be adopted to output the rotation angle.

[0071] The control device 57 is responsible for controlling the operations of the respective devices in the position adjustment device 26. The control device 57 is composed of a computer system including a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a ROM (Read Only Memory) that stores various programs and fixed value data, etc., a RAM (Random Access Memory) in which various data are temporarily stored when executing various arithmetic processes, and peripheral circuits thereof.

[0072] The control device 57 uses the registration mark 7 to control the stretching of the cover film 4, thereby adjusting the attachment position of the cover film 4 to the container film 3 along the longitudinal direction of both films 3 and 4. In the present embodiment, the control device 57 uses the registration mark 7 so that, as shown in FIG. 6, in the PTP film 6 after attachment, the central position of the registration mark 7 (each registration mark 7a, 7b, 7c) along the longitudinal direction of the PTP film 6 and the position of the orthogonal line Rc coincide in the longitudinal direction of the PTP film 6 (aiming for coincidence), and attaches the cover film 4 to the container film 3. As a result, the relative positions of the pocket portion 2 and the registration mark 7 along the longitudinal direction of the PTP film 6 can be adjusted, and thus, the relative positions of the punching line Rp (orthogonal line Rc) and the registration mark 7, which are in a certain positional relationship with the pocket portion 2, can also be adjusted.

[0073] In this embodiment, the control device 57 controls the stretching of the cover film 4 by controlling the operations of the feeding roller 53a and the stretching roller 53b via the feeding servo motor 53c and the stretching servo motor 53d.

[0074] Next, each control of the feeding roller 53a and the stretching roller 53b performed by the control device 57 will be described with reference to FIGS. 9 and 10. FIGS. 9 and 10 are block diagrams showing control blocks related to stretching control in the position adjusting device 26.

[0075] First, the control of the feeding roller 53a will be described. When the position information K regarding the position of the sliding portion 54c is input from the tension encoder 54g to the control device 57, in block a, the control device 57 calculates a speed component FK obtained by multiplying the position information K by a coefficient F.

[0076] Next, in block b, the control device 57 obtains the sum V + FK of the basic speed V of the PTP packaging machine 10 and the speed component FK. Then, the control device 57 controls the operation of the feeding roller 53a via the feeding servo motor 53c so as to operate at the rotational speed V + FK.

[0077] In this embodiment, when the tension T2 is smaller than the tension T1 and the sliding portion 54c moves to the upstream side (right direction in FIG. 8) in the conveyance direction of the cover film 4, the output value K becomes relatively small. Therefore, the rotational speed V + FK of the feeding roller 53a also becomes relatively small, and the amount of the cover film 4 fed out by the feeding roller 53a becomes small. As a result, the tension T2 increases, and the sliding portion 54c moves to the downstream side (left direction in FIG. 8) in the conveyance direction of the cover film 4.

[0078] On the other hand, when the tension T2 becomes greater than the tension T1 and the sliding portion 54c moves downstream in the conveyance direction of the cover film 4 (leftward in FIG. 8), the output value K becomes relatively large. Therefore, the rotational speed V+FK of the pay-out roller 53a also becomes relatively large, and the amount of pay-out of the cover film 4 by the pay-out roller 53a becomes large. As a result, the tension T2 decreases, and the sliding portion 54c moves upstream in the conveyance direction of the cover film 4 (rightward in FIG. 8).

[0079] Therefore, the control device 57 controls the operation of the pay-out roller 53a so that the sliding portion 54c stays at a substantially constant position, that is, so that the position information K takes a substantially constant value.

[0080] Next, the control of the stretching roller 53b will be described. The control device 57 calculates, in block c, a rotational speed [G(V+FK)] obtained by multiplying the stretching ratio G by the rotational angle V+FK, and controls the stretching roller 53b via a stretching servo motor 53d so as to operate at the rotational speed [G(V+FK)]. According to the stretching ratio G, the amount of stretching of the cover film 4 changes, and as a result, the relative positions of the punching line Rp and the registration mark 7 on the PTP film 6 change. Incidentally, instead of the stretching ratio G, a decrease amount G' of the rotational speed for stretching the cover film 4 at a predetermined stretching ratio may be calculated, and the stretching roller 53b may be controlled so as to operate at the rotational speed (V+FK-G').

[0081] Here, a method for calculating the elongation rate G will be described with reference to FIG. 10. First, in block d, the control device 57 acquires, at the timing when the registration mark 7 of the cover film 4 is detected by the stretching sensor 52, the rotation amount A of the film receiving roll 24 as the position information of the container film 3 output from the position detection encoder 56. In the present embodiment, since three registration marks 7a, 7b, and 7c are detected by the stretching sensor 52, the control device 57 acquires a total of three rotation amounts of the film receiving roll 24 at the timings when they are detected. Then, the control device 57 uses the average value or the median value of these rotation amounts as the rotation amount A. The rotation amount A is information indicating the position of the cover film 4 upstream of the stretching device 53.

[0082] Also, in block e, the control device 57 acquires, at the timing when the registration mark 7 of the cover film 4 is detected by the post-stretching sensor 55, the rotation amount B of the film receiving roll 24 as the position information of the container film 3 output from the position detection encoder 56. In the present embodiment, since three registration marks 7a, 7b, and 7c are detected by the post-stretching sensor 55, the control device 57 acquires a total of three rotation amounts of the film receiving roll 24 at the timings when they are detected. Then, the control device 57 uses the average value of these rotation amounts as the rotation amount B. The rotation amount B is information indicating the position of the cover film 4 downstream of the stretching device 53.

[0083] Furthermore, in block f, the control device 57 calculates the difference P - B between the rotation amount B acquired in block e and a predetermined target position P. This difference P - B corresponds to the magnitude of the deviation in the cover film 4 downstream of the stretching device 53. The target position P corresponds to the rotation amount of the film receiving roll 24 when it is assumed that there is no deviation in the cover film 4 downstream of the stretching device 53.

[0084] Next, in block g, the control device 57 calculates a feedback amount [C(P - B)] by multiplying the calculated difference P - B by a feedback coefficient C.

[0085] Furthermore, in block h, the control device 57 obtains the corrected target position [Q + C(P - B)] by adding the calculated feedback amount [C(P - B)] to the predetermined target position Q. Here, the target position Q corresponds to the rotation amount of the film receiving roll 24 when it is assumed that there is no deviation in the cover film 4 upstream of the stretching device 53.

[0086] Thereafter, in block i, the control device 57 calculates the difference [Q + C(P - B) - A] between the rotation amount A obtained in block d and the corrected target position [Q + C(P - B)] obtained in block h. This difference [Q + C(P - B) - A] corresponds to the magnitude of the deviation in the cover film 4 upstream of the stretching device 53.

[0087] Finally, in block j, the control device 57 calculates the stretching ratio G by multiplying the difference obtained in block i by a predetermined coefficient E. Therefore, the stretching ratio G can be expressed as E[Q + C(P - B) - A].

[0088] When the stretching ratio G is calculated, as described above, the control device 57 controls the stretching roller 53b using the calculated stretching ratio G, and decelerates the stretching roller 53b with respect to the pay - out roller 53a to stretch the cover film 4. By stretching the cover film 4, as shown in FIGS. 6 and 7, the central position of the registration mark 7 along the longitudinal direction of the PTP film 6 and the position of the orthogonal line Rc can be made to generally coincide in the longitudinal direction of the PTP film 6.

[0089] Also, while the control device 57 performs the above - described control, by appropriately setting the size, shape, etc. of the registration mark 7 and the punching line Rp, the entire registration mark 7 is positioned (aimed to be positioned) at the portion remaining as the scrap portion 42 in the PTP film 6, and the cover film 4 is attached to the container film 3.

[0090] Furthermore, by the control device 57 performing the control as described above, etc., a part of the registration mark 7 is positioned in a triangular region TA (the region hatched in FIGS. 6, 7, etc.) surrounded by two curved lines Rw in a positional relationship of sandwiching the scrap portion 42 along the longitudinal direction of the PTP film 6 and an extension line Es of the straight line Rs, and the cover film 4 is attached to the container film 3.

[0091] In addition, by the control device 57 performing the control as described above, etc., the center registration mark 7c is positioned from a triangular region TA related to one of the columns of two adjacent sheet corresponding portions 101 to a triangular region TA related to the other of the columns of these two sheet corresponding portions 101, and the cover film 4 is attached to the container film 3.

[0092] Incidentally, in the step of attaching the cover film 4 to the container film 3 (i.e., the "attachment step"), due to the meandering of the cover film 4 or the like, the relative positions of the registration mark 7 and the punching line Rp (orthogonal line Rc) on the PTP film 6 after attachment may vary slightly. Therefore, for example, as shown in FIG. 7, when the cover film 4 is attached to the container film 3 with the attachment position shifted in the width direction of both films 3 and 4, the relative positions of the registration mark 7 and the punching line Rp (orthogonal line Rc) along the width direction of the PTP film 6 may vary on the PTP film 6 after attachment. Also, as described above, the attachment of the cover film 4 to the container film 3 is performed such that (aiming for them to be) the central position of the registration mark 7 and the position of the orthogonal line Rc coincide in the longitudinal direction of the PTP film 6, but due to the influence of the meandering of the cover film 4 or the like, the relative positions of the registration mark 7 and the punching line Rp along the longitudinal direction of the PTP film 6 may vary.

[0093] In this regard, in the present embodiment, while the control device 57 performs the above-described control, the sizes, shapes, etc. of the registration mark 7 and the punching line Rp are appropriately set, so that the cover film 4 is attached to the container film 3 in anticipation of the above-described variation in the relative position. More specifically, even when the registration mark 7 is in a state closest to the orthogonal line Rc within the allowable range, the registration mark 7 is provided at a position that satisfies Lw≧Lm + 2δ (aiming to be provided), and the cover film 4 is attached to the container film 3.

[0094] Here, Lw (mm) is a numerical value assuming a state where the central position of the registration mark 7 along the longitudinal direction of the PTP film 6 coincides with the position of the orthogonal line Rc along the longitudinal direction of the PTP film 6, while the registration mark 7 and the punching line Rp (orthogonal line Rc) are in a state where the registration mark 7 is closest to the orthogonal line Rc due to the position variation. Lw (mm) corresponds to the margin from the registration mark 7 to the curved line Rw along the longitudinal direction of the PTP film 6 in this state, and in the present embodiment, it is referred to as the allowable width. The allowable width Lw is the maximum movement distance of the registration mark 7 when the registration mark 7 is virtually moved from one curved line Rw side to the other curved line Rw side along the longitudinal direction of the PTP film 6 between the two curved lines Rw sandwiching the registration mark 7 in this state.

[0095] Lm (mm) is the width of the registration mark 7 along the longitudinal direction of the PTP film 6. In terms of more reliably detecting the registration mark 7, it is preferable that the width Lm of the registration mark 7 is 1 mm or more, and more preferably 2 mm or more.

[0096] δ (mm) is the allowable range regarding the positional deviation of the registration mark 7 with respect to the pocket portion 2 (orthogonal line Rc) along the longitudinal direction of the PTP film 6. The allowable range is appropriately set according to the variety of the PTP sheet 1 and the like.

[0097] By satisfying Lw≧Lm + 2δ, the registration mark 7 is closest to the orthogonal line Rc, and the displacement amount of the registration mark 7 with respect to the pocket portion 2 (orthogonal line Rc) along the longitudinal direction of the PTP film 6 is maximized within the allowable range δ. Even in the case where the cover film 4 is attached to the container film 3 in such a state, in the PTP film 6 after attachment, the registration mark 7 does not fall on the punching line Rp. That is, even when the cover film 4 is attached to the container film 3 in a state where the displacement amount in the width direction and the displacement amount in the longitudinal direction are both maximized within the allowable range, in the PTP film 6 after attachment, the registration mark 7 does not fall on the punching line Rp.

[0098] As described in detail above, according to the present embodiment, the entire registration mark 7 is located at a portion that remains as the scrap portion 42 in the PTP film 6, and further, a part of the registration mark 7 is located in the triangular region TA, and the cover film 4 is attached to the container film 3. Therefore, while more surely preventing the registration mark 7 from remaining on the obtained PTP sheet 1, the punching line Rp can be made to enter between the registration marks 7 in the strip-shaped regions LA, CA, RA. As a result, it is possible to more surely prevent the appearance of the PTP sheet 1 from deteriorating due to the remaining of the registration mark 7, and to effectively reduce the scrap (scrap portion 42). In addition, since it is not necessary to make the size of the registration mark 7 excessively small for scrap reduction, the function of the registration mark 7 can be appropriately exhibited.

[0099] Furthermore, in the step of attaching the cover film 4 to the container film 3 (attachment step), even when the registration mark 7 is in the state closest to the orthogonal line Rc, the registration mark 7 is provided at a position satisfying Lw≧Lm+2δ, and the cover film 4 is attached to the container film 3. Therefore, even if, due to the meandering of the cover film 4 or the like, in the PTP film 6 after attachment, the registration mark 7 happens to be in the state closest to the orthogonal line Rc and is displaced by δ along the longitudinal direction of the PTP film 6 (that is, the maximum displacement within the allowable range has occurred), it is possible to prevent the registration mark 7 from overlapping the punching line Rp. As a result, it is possible to more reliably prevent the registration mark 7 from remaining on the PTP sheet 1, and it is possible to effectively suppress the deterioration of the appearance of the PTP sheet 1 due to the presence of the registration mark 7.

[0100] Furthermore, according to the present embodiment, the length of the center registration mark 7c along the width direction of the PTP film 6 can be made relatively large. Therefore, the detection of the center registration mark 7c becomes easy, and the function of the center registration mark 7c can be more appropriately exerted.

[0101] In addition, using both the left registration mark 7a located on one end side in the width direction of the PTP film 6 and the right registration mark 7b located on the other end side in the width direction of the PTP film 6, the attachment position of the cover film 4 to the container film 3 is adjusted. Therefore, even when the cover film 4 is slightly inclined with respect to the container film 3, the amount of displacement of the cover film 4 with respect to the container film 3 can be made relatively small on both the one end side and the other end side in the width direction. As a result, it is possible to effectively suppress the occurrence of problems (for example, displacement of the printing portion 8, etc.) caused by the inclination of the cover film 4 with respect to the container film 3.

[0102] Note that the present invention is not limited to the description of the above embodiment, and for example, it may be implemented as follows. Of course, other application examples and modification examples not illustrated below are also naturally possible.

[0103] (a) In the above-described embodiment, the printing section 8 and the registration mark 7 are provided in advance on the cover film 4. Instead, the printing section 8 and the registration mark 7 may be printed on the conveyed cover film 4 by a printing device provided along the conveyance path of the cover film 4.

[0104] (b) In the above-described embodiment, the PTP film 6 is configured such that a plurality (two columns) of columns of the sheet corresponding portion 101 are provided. Instead, as shown in FIG. 11, the PTP film 6 may have only one column of the sheet corresponding portion 101. Of course, the PTP film 6 may have three or more columns of the sheet corresponding portion 101.

[0105] (c) In the above-described embodiment, the left registration mark 7a, the right registration mark 7b, and the center registration mark 7c are provided as the registration mark 7, but only one or two of these registration marks 7a, 7b, 7c may be provided.

[0106] (d) In the above-described embodiment, the straight line Rs is set so as to be separated from the edge in the width direction of the PTP film 6. Therefore, after the PTP film 6 is punched, strip-shaped scrap portions 42 extending in the longitudinal direction of the PTP film 6 remain at positions corresponding to both ends in the width direction of the PTP film 6.

[0107] On the other hand, as shown in FIG. 12, the punching line Rp may be set so that the widthwise edge of the PTP film 6 coincides with the straight line Rs. In this case, the amount of the scrap portion 42 can be further reduced, which is more advantageous in terms of resource protection and cost reduction. When the widthwise edge of the PTP film 6 coincides with the straight line Rs, the entire registration mark 7 (left registration mark 7a or right registration mark 7b) provided on the widthwise edge side of the PTP film 6 will be located within the triangular region TA. Therefore, depending on the size of the triangular region TA, the registration mark 7 may be relatively short, and as a result, it may be difficult to detect the registration mark 7. Therefore, in terms of enabling appropriate detection of the registration mark 7, it is preferable to provide a center registration mark 7c in addition to or instead of the registration mark 7 (left registration mark 7a or right registration mark 7b) on the widthwise edge side of the PTP film 6.

[0108] (e) In the above embodiment, the case where the content is the tablet 5 is exemplified, but the type, shape, etc. of the content are not particularly limited, and for example, the content may be different from the tablet 5 such as food or electronic components.

[0109] (f) The configuration of the PTP sheet 1 to be manufactured is not limited to the above embodiment. For example, the arrangement and number of the pocket portions 2 per unit of the PTP sheet 1 are not limited to the above embodiment at all.

[0110] (g) In the above embodiment, the PTP sheet 1 is cited as the "blister sheet", but the technical idea of the present invention may be applied to blister sheets other than the PTP sheet 1.

[0111] (h) The method for adjusting the attachment position of the cover film 4 to the container film 3 is not limited to those exemplified in the above embodiment, and may be appropriately changed. Therefore, for example, the methods described in Japanese Patent Application Laid-Open No. 2010-105688 or Japanese Patent Application Laid-Open No. 2007-69950 may be adopted.

Explanation of Reference Numerals

[0112] 1…PTP sheet (blister sheet), 2…pocket part, 3…container film, 4…cover film, 6…PTP film (blister film), 7…registration mark, 7a…left registration mark (one-end side registration mark), 7b…right registration mark (the other-end side registration mark), 7c…center registration mark (intermediate side registration mark), 10…PTP packaging machine (blister packaging machine), 23…sealing device (attachment means), 37…sheet punching device (punching means), 101…sheet corresponding part, Es…extension line, Rc…orthogonal line, Rp…punching line, Rs…straight line, Rw…curved line, TA…triangular region.

Claims

1. A method for manufacturing a blister sheet for manufacturing a blister sheet having a rectangular shape in plan view with rounded corners by attaching a strip-shaped cover film so as to close a pocket portion formed in the container film to form a strip-shaped blister film and punching the blister film, comprising: An attaching step of attaching the cover film to the container film; A punching step of obtaining the blister sheet by punching the blister film with a punching line that includes a pair of parallel straight lines extending along the longitudinal direction of the blister film, a pair of parallel orthogonal lines extending along the width direction of the blister film, and a curved line that connects the straight line and the orthogonal line and is an arc-shaped line corresponding to the four corners of the blister sheet, and having a certain positional relationship with respect to the pocket portion; The cover film has a plurality of registration marks provided at predetermined intervals in a strip-shaped region having a certain width extending along the longitudinal direction of the blister film; In the attaching step, the registration marks are used; In the blister film after attachment, the central position of the registration marks along the longitudinal direction of the blister film coincides with the position of the orthogonal line in the longitudinal direction of the blister film; The entire registration marks are located at a portion that remains as a scrap portion after obtaining the blister sheet in the blister film; Furthermore, at least a part of the registration marks is located in a triangular region surrounded by the two curved lines and the extension line of the straight line in a positional relationship that sandwiches the scrap portion along the longitudinal direction of the blister film; The method for manufacturing a blister sheet is characterized in that the cover film is attached to the container film in such a manner.

2. In the attaching step, in the blister film after attachment, the relative positions of the registration marks and the orthogonal line may vary. The central position of the registration mark along the longitudinal direction of the blister film and the position of the orthogonal line coincide in the longitudinal direction of the blister film. On the other hand, assuming the state where the registration mark is closest to the orthogonal line due to the variation in the relative positions of the registration mark and the orthogonal line, when the registration mark is virtually moved from one curved line side to the other curved line side along the longitudinal direction of the blister film between the two curved lines sandwiching the registration mark, the allowable width, which is the maximum movement distance of the registration mark, is defined as Lw (mm). The width of the registration mark along the longitudinal direction of the blister film is defined as Lm (mm). When the allowable range regarding the displacement of the registration mark along the longitudinal direction of the blister film is defined as δ (mm), In the attaching step, even when the registration mark is in the state closest to the orthogonal line, the registration mark is provided at a position satisfying Lw ≥ Lm + 2δ, and the cover film is attached to the container film. The method for manufacturing a blister sheet according to claim 1, characterized in that.

3. The registration mark has an intermediate-side registration mark located on the intermediate side in the width direction of the blister film. The blister film is configured such that the sheet corresponding portions that become the blister sheet by the punching step are arranged along the longitudinal direction of the blister film, and a plurality of rows of the sheet corresponding portions are provided. In the attaching step, the intermediate-side registration mark is positioned from the triangular region related to one of the two adjacent rows of the sheet corresponding portions to the triangular region related to the other of the two rows of the sheet corresponding portions, and the cover film is attached to the container film. The method for manufacturing a blister sheet according to claim 1, characterized in that.

4. The registration mark has an end-side registration mark located on one end side in the width direction of the blister film and another end-side registration mark located on the other end side in the width direction of the blister film. In the attaching step, the attaching position of the cover film to the container film is adjusted using both the end-side registration mark and the other end-side registration mark. The method for manufacturing a blister sheet according to claim 1, characterized in that.

5. A blister packaging machine for manufacturing a blister sheet having a rectangular shape in plan view with rounded corners by attaching a strip-shaped cover film so as to close a pocket portion formed in a strip-shaped container film and punching the blister film, comprising: attaching means for attaching the cover film to the container film; punching means for obtaining the blister sheet by punching the blister film along a punching line which is composed of a pair of parallel straight lines extending along the longitudinal direction of the blister film, a pair of parallel orthogonal lines extending along the width direction of the blister film, and curved lines which connect the straight lines and the orthogonal lines and correspond to the four corners of the blister sheet and which have a fixed positional relationship with respect to the pocket portion; the cover film has a plurality of registration marks located at predetermined intervals in a strip-shaped region having a fixed width extending along the longitudinal direction of the blister film; the attaching means utilizes the registration marks; in the blister film after attachment, the central position of the registration marks along the longitudinal direction of the blister film coincides with the position of the orthogonal lines in the longitudinal direction of the blister film; the entire registration marks are located at a portion which remains as a scrap portion after the blister sheet is obtained from the blister film; further, at least a part of the registration marks is located in a triangular region surrounded by the two curved lines and the extension line of the straight line which have a positional relationship of sandwiching the scrap portion along the longitudinal direction of the blister film; the blister packaging machine is configured to attach the cover film to the container film in such a manner.

6. In the blister film obtained by the attaching means, the relative positions of the registration marks and the orthogonal lines may vary. The central position of the registration mark along the longitudinal direction of the blister film and the position of the orthogonal line coincide in the longitudinal direction of the blister film. On the other hand, assuming the state where the registration mark is closest to the orthogonal line due to the variation in the relative positions of the registration mark and the orthogonal line, when the registration mark is virtually moved from one curved line side to the other curved line side along the longitudinal direction of the blister film between the two curved lines sandwiching the registration mark, the allowable width, which is the maximum movement distance of the registration mark, is defined as Lw (mm). The width of the registration mark along the longitudinal direction of the blister film is defined as Lm (mm). When the allowable range regarding the displacement of the registration mark along the longitudinal direction of the blister film is defined as δ (mm), The attaching means is configured such that, even when the registration mark is in the state closest to the orthogonal line, the registration mark is provided at a position satisfying Lw ≥ Lm + 2δ, and the cover film is attached to the container film. The blister packaging machine according to claim 5, characterized in that.

7. The registration mark has an intermediate-side registration mark located on the intermediate side in the width direction of the blister film. The blister film is configured such that the sheet corresponding portions that become the blister sheets by punching of the punching means are arranged along the longitudinal direction of the blister film, and a plurality of rows of the sheet corresponding portions are provided. The attaching means is configured such that the intermediate-side registration mark is positioned from the triangular region related to one of the two adjacent rows of the sheet corresponding portions to the triangular region related to the other of the two rows of the sheet corresponding portions, and the cover film is attached to the container film. The blister packaging machine according to claim 5, characterized in that.

8. The registration mark has an end-side registration mark located on one end side in the width direction of the blister film and the other end-side registration mark located on the other end side in the width direction of the blister film. The attaching means is configured to be able to adjust the attaching position of the cover film to the container film by using both the end-side registration mark and the other end-side registration mark. The blister packaging machine according to claim 5, characterized in that.

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