JP6208531B2 - cap - Google Patents

Description

  The present invention relates to a cap for sealing a beverage container or the like having a screw to which the cap is screwed.

  A metal cap is used as a cap attached to a container made of steel, aluminum alloy or the like. Moreover, since it is necessary to remove the cause of a malfunction when a malfunction occurs in the cap, an identification mark is attached in advance in order to identify the mold in which the cap is molded.

For example, Patent Document 1 proposes that an identification mark be provided on a part of a knurl that is connected to the periphery of the top plate of the cap. Further, it is described that the identification mark is formed in a part of the knurled portion by changing the notch position of the knurled ridge, the number of the notches, and a combination thereof, and thereby various information amounts can be obtained. .
In this way, by attaching an identification mark to the cap in advance, when a malfunction occurs in the cap, which device (mold) produces the malfunctioned cap based on the information of the identification mark attached. It can be immediately determined whether it has been. Therefore, it is possible to immediately inspect and repair the device in which the defect is found, and to stably manufacture a cap with maintained performance.

  Moreover, although it is not a metal cap, Patent Document 2 discloses a cap made of synthetic resin with an identification mark (capping mark). In this patent document 2, a container is filled with contents in a contents filling factory, and an identification mark is given by a capping machine when the cap is attached to the container mouth. It is described that it is used for discriminating illegal products such as the above and mischievous products from genuine products.

JP 2002-104479 A Japanese Utility Model Publication No. 6-80660

As in Patent Document 1 and Patent Document 2, by attaching an identification mark to a cap, each cap can be identified by the difference in the identification mark attached to the cap.
However, in the cap described in Patent Document 1, even if the notch position of the knurled ridge is changed, the difference between the changed part and the other part is very small. It is not easy to find a change from the knurls formed in the knurl. Moreover, in order to identify the several cap shape | molded by several shaping | molding apparatuses, it is necessary to change the position of a some convex part, As a result, there exists a possibility of impairing the design property of a cap external appearance. The knurled portion is provided to make it easier to grip the cap when the cap is opened. However, changing the positions of the plurality of convex portions may impair the grip feeling felt when the cap is gripped.
Furthermore, since the method described in Patent Document 2 is a method applicable to a cap made of synthetic resin, it is difficult to apply it to a metal cap.

  The present invention has been made in view of such circumstances, and can improve the grip feeling when opening a metal cap, and can identify each molding apparatus without impairing the design of the appearance of the cap. An object of the present invention is to provide a cap capable of performing the above.

The present invention provides a cap body having a top surface portion and a cylindrical portion substantially suspended from the periphery of the top surface portion, and a plurality of alternately arranged in the circumferential direction in the vicinity of the top surface portion of the cylindrical portion. A metal cap formed with a knurl portion comprising a convex portion and a concave portion, wherein the convex portion protrudes outward in the radial direction, and the protruding height is maximum at a predetermined position in the axial direction of the cylindrical portion. And at least one of the protrusions has a shape different from the other protrusions, and the protrusions of the different shape rotate the cap body along the circumferential direction of the cylindrical portion. The convex portion and the concave portion are alternately processed at a position avoiding the overlap portion processed so that the molding start end portion at the start of molding and the molding end portion at the end of molding formed at the time of rotational molding overlap each other. It is formed.

By providing a top portion on each convex portion forming the knurl portion, the cap can be easily gripped, and a high grip feeling can be given to the user.
In the cap of the present invention, at least one of the convex portions is provided with an identification mark for each cap molding device by forming a convex portion having a different shape from the other convex portions. Since it is changed within a very small range of the convex portion forming portion, the design of the cap and the grip feeling at the time of opening are not impaired.

Thus, since the difference in the shape of the convex portion is very small, it is not easy to find the convex portion whose shape has been changed from the convex portions formed on the entire circumference of the cylindrical portion, but the cap of the present invention. In the method, the identification mark can be easily found by confirming the identification mark with reference to the overlap portion (double processed portion) formed at the time of rotational molding.
In addition, in the overlap part, the shape of the convex part is processed in an overlapping manner, so the shape tends to collapse compared to the convex part formed in other parts, but the convex part of a different shape is the overlap part Therefore, even if the shape is slightly changed, it can be clearly formed so as to be distinguished from others. Furthermore, since the convex portions having different shapes are formed so as to avoid the overlap portions, the range of the knurled portions for confirming the convex portions having the different shapes is narrowed, and the identification marks can be easily found. Therefore, by providing the identification mark at a position avoiding the overlap portion, the identification mark can be reliably recognized even if the difference in shape is slight.

In the cap of the present invention, the convex portion having a different shape may be formed by disposing the top portion at a position shifted in the axial direction of the cylindrical portion as compared with the top portion of the other convex portion.
In this case, the convex portion having a different shape and the other convex portion are formed by shifting the height position of the top portion (the axial position of the cylindrical portion) using the top portion formed on the convex portion. An identification mark is provided, and the difference in the height position of the top is changed in a very small range of the convex formation part, reducing the loss of the cap design and the grip feeling when opening the cap. Can be made.

In the cap of the present invention, it is preferable that the tops of the convex portions having different shapes and the top portions of the other convex portions are displaced by more than 0.2 mm in the axial direction of the cylindrical portion.
When the amount of displacement of the height position in the axial direction of the top portion is 0.2 mm or less, it becomes difficult to easily identify the convex portions having different shapes in which the position of the top portion is changed.

In the cap of the present invention, the number of the convex portions having different shapes may be 1/4 or less of the number of the convex portions constituting the knurl portion.
In the knurl part formed in the cylindrical part of the cap, when the number of convex parts having different shapes is increased, the hook part is deformed at the time of molding, which tends to cause molding defects. In this case, since the liner may come off from the deformed hook portion and the locking performance of the hook portion may be impaired, the number of convex portions having different shapes is preferably ¼ or less of the whole.

In the cap according to the aspect of the invention, it is preferable that the top portion is disposed below the maximum pushing portion in which the concave portion is pushed inward in the radial direction in the axial direction of the cylindrical portion.
The knurled part is formed in the vicinity of the top surface part of the cylindrical part, but when the top position of the convex part is above the maximum pushing part of the concave part, the top part is capped when the cap is capped (drawn) into the container. It becomes easy to deform | transform and it becomes difficult to identify as a recognition mark. Therefore, by arranging the top of each convex part below the maximum push-in part, it is possible to avoid deformation of the top when capping the cap into the container, so that the recognition mark can be recognized well. .

  According to the present invention, it is possible to easily grasp a metal cap and improve grip feeling when opening the cap, and it is possible to identify each molding apparatus without impairing the design of the cap appearance. Become.

It is a fragmentary sectional view showing the cap of the embodiment of the present invention. It is a figure explaining the knurler which processes the cylindrical part of a cap. It is the elements on larger scale of the knurler shown in FIG. It is the elements on larger scale of the knurler shown in FIG. 2, and is a figure explaining convex part shaping | molding. It is sectional drawing which follows the CC line shown in FIG. It is the elements on larger scale of the knurler shown in FIG. 2, and is a figure explaining recessed part shaping | molding. FIGS. 7A and 7B are cross-sectional views of a main part taken along line DD shown in FIG. 6, in which FIG. 6A shows the time of forming a recess other than the hook portion, and FIG. It is sectional drawing explaining the convex part of a different shape which changed the position of the top part. It is a fragmentary sectional view showing the cap of other embodiments of the present invention. It is a fragmentary sectional view which shows the bottle can to which the cap was attached. It is an image of the terminal trace formed in a slit.

Hereinafter, embodiments of a cap according to the present invention will be described with reference to the drawings.
As shown in FIG. 10, the cap 1 of this embodiment is a pill fur proof cap (also called a PP cap) that is attached to a cap 21 of a bottle can 2 made of aluminum or aluminum alloy (made of metal) having a diameter of 38 mm, for example. Will be called.)

  The cap 1 is formed by molding a plate of aluminum or aluminum alloy into a cup shape, and includes a top surface portion 41 and a cylindrical portion 42 that is substantially suspended from the periphery of the top surface portion 41 as shown in FIG. It has a cap body 4 and a liner 5 provided on the inner surface of the cap body 4.

As shown in FIG. 1, the cylindrical portion 42 of the cap body 4 includes a knurl portion 13 including a plurality of convex portions 11 and concave portions 12 that are alternately arranged in the vicinity of the top surface portion 41 at intervals in the circumferential direction. The slits 43, the upper groove portions 44, the panel portions 45, and the like that are intermittently formed in the circumferential direction at the lower end portion of the cylindrical portion 42 are formed by rotational molding (roll forming).
In the rotational molding, the knurler 6 as shown in FIG. 2 is used to move the inner spindle 62 on the movable side mounted with the cap body 4 while rolling along the outer peripheral surface of the outer tool 61 on the fixed side. Molding is performed by sandwiching the cylindrical portion 42 of the cap body 4 between the inner spindle 62 and the inner spindle 62.

Further, as shown in FIG. 1, the cylindrical portion 42 of the cap body 4 is configured such that the upper portion 46 and the lower portion 47 are vertically divided through slits 43 that are intermittently formed in the lower end portion thereof in the circumferential direction. The cylinder upper part 46 and the cylinder lower part 47 are connected to each other by a plurality of bridges 43 a formed between adjacent slits 43.
Then, the convex portion 11 and the concave portion 12 form a knurl portion 13 having an uneven surface on the outer peripheral surface of the cylindrical portion 42 (cylinder upper portion 46). Can be increased. As shown in FIGS. 1 and 5, the convex portion 11 protrudes outward in the radial direction, and has a shape having a top portion 11 a having a maximum protruding height at a predetermined position in the axial direction of the cylindrical portion 42. The The cap 1 can be firmly gripped by biting into the hand when the top portion 11a is opened, so that a high grip feeling can be given to the user. Therefore, the cap 1 can be gripped without sliding the hand, and the user can easily open the cap.

  Moreover, in the cap 1, the identification mark which distinguishes the installation in which the cap 1 is shape | molded by using the top part 11a formed in this convex part 11 is provided. As shown in FIGS. 1 and 8, at least one of the plurality of convex portions 11 provided with the identification mark is a distance H between the top portion 11a of the other convex portion 11 and the height position (axial position of the cylindrical portion 42). By forming the top portion 11 a by shifting, a convex portion having a shape different from that of the other convex portions 11 is formed and provided. Details of this identification mark will be described later.

Further, the top portions 11a formed on these convex portions 11 are adjacent to the upper groove portion 44 adjacent to the lower side of the maximum pushing portion 12a in which the concave portion 12 is pushed inward in the radial direction in the axial direction of the cylindrical portion 42. Is disposed in the upper region F by 1.5 mm.
A hook portion 15 having an opening 14 formed by cutting the concave portion 12 in the circumferential direction is appropriately formed in a part of the concave portion 12, and the liner 5 is capped by being locked to the hook portion 15. It is provided on the inner surface of the main body 4.
Further, the hook portion 15 is formed by pushing a lower portion of the cut formed along the circumferential direction of the cylindrical portion 42 inward in the radial direction, and protrudes in a mountain shape (V-shape) inward in the radial direction. Has been. And the opening part 14 is formed by the notch opening.

As shown in FIG. 1, the upper end surface of the hook portion 15 is formed at a position separated from the inner surface of the top surface portion 41 by at least the thickness of the liner 5. The liner 5 is attached to the cap body 4 by being disposed between the upper end surface of the hook portion 15 and the inner surface of the top surface portion 41.
The opening 14 functions as a vent hole for releasing the gas inside the bottle can 2 to the outside when the cap 1 is rotated while breaking the bridge 43a. In addition, the thickness of the liner 5, the outer diameter of the sliding layer 51 constituting the liner 5, the outer diameter of the sealing layer 52, and the like are determined according to the dimensions of the cap body 4.

The liner 5 is formed so as to come into contact with the base 21 when the bottle can 2 is closed by the cap 1 and to seal the inside of the bottle can 2, and is disposed on the inner surface side of the top surface portion 41 of the cap body 4. Has been.
The sliding layer 51 constituting the liner 5 is formed in a disk shape from polypropylene or the like. The sealing layer 52 is formed of an elastomer resin that is softer than the sliding layer 51 and has a sealing function.

Next, details of the identification mark formed on the cap 1 of the present embodiment will be described.
The cap 1 is provided with an identification mark that identifies the equipment of each cap using the top 11a formed on the convex portion 11 of the knurled portion 13.
Specifically, for example, as shown in FIG. 1, among the plurality of convex portions 11 provided along the circumferential direction of the cylindrical portion 42, at least one convex portion 11 and another convex portion 11 and a height position (cylindrical) The cap 1 is provided with an identification mark by shifting the position of the portion 42 in the axial direction) to form the top portion 11a.

At this time, as shown in FIG. 1 or 8, the top 11 a of each convex portion 11 is a region from a position below the maximum pushing portion 12 a of the concave portion 12 to a position 1.5 mm above the upper groove portion 44. Formed in F. Further, if the displacement amount of the height position of the top portion 11a in the axial direction is 0.2 mm or less, it becomes difficult to easily identify the convex portions 11 having different shapes in which the height position of the top portion 11a is shifted. The top portion 11a whose direction position is shifted is formed at a position that is shifted by at least more than 0.2 mm from the position where the top portion 11a of the other convex portion 11 is formed.
In addition, the number of convex portions 11 having different shapes is desirably ¼ or less of the number of convex portions 11 constituting the knurled portion 13. If the number of the convex portions 11 having different shapes increases, the hook portion 15 is deformed during molding and the molding is liable to be caused. Therefore, the liner 5 is detached from the deformed hook portion 15, and the locking performance of the hook portion 15 is improved. There is a risk of damage. Further, the molding failure of the hook portion 15 may affect the vent performance of the opening portion 14 as a vent hole.

Even when the top portion 11a of the convex portion 11 is formed on the top surface portion 41 side above the maximum push-in portion 12a, the hook portion 15 is easily deformed during molding, which may cause molding failure. The liner 5 may come off from 15 and the locking performance of the hook portion 15 may be impaired. Further, the molding failure of the hook portion 15 may affect the vent performance of the opening portion 14 as a vent hole. Furthermore, when capping the cap 1 into the bottle can 2, the top 11a may be deformed, and the visibility as an identification mark may be impaired.
On the other hand, if the top portion 11a is to be formed closer to the upper groove portion 44 than 1.5 mm, it is difficult to form the top portion 11a by sufficiently projecting, and the grip feeling of the knurled portion 13 may be impaired. At the same time, the top 11a may be deformed by contact with the mold during capping, and the visibility as an identification mark may be impaired.

  The identification mark using the top portion 11a is formed with the formation position of the convex portion 11 having the top portion 11a shifted in the axial direction so that a different identification mark is given for each molding apparatus for forming the cap 1, and the position thereof. It is given by changing the combination of the top portions 11a of the projections 11 in the plurality of projections 11 by changing the number of arrangements. As described above, a plurality of types of identification marks are provided according to the arrangement pattern of the convex portions 11 having the top portions 11a whose height positions are shifted.

Moreover, the shape formed in cylindrical parts 42, such as the convex part 11 and the recessed part 12 which have these top parts 11a, is formed by rotational molding as mentioned above.
For example, in the knurler 6 shown in FIGS. 2 and 3, the cap main body 4 is rotated together with the inner spindle 62 by rotating the inner spindle 62 with the cap main body 4 clockwise while being pressed against the outer tool 61. The cylindrical portion 42 is sandwiched and molded between the outer tool 61 and the inner spindle 62. At this time, in order to process the entire circumference of the cylindrical portion 42 without leaving a gap, the molding start end portion at the start of molding and the molding end portion at the end of molding are overlapped, and the cylindrical portion 42 of the cap body 4 is processed. In part, an overlap part (double processed part) processed in a double manner is formed.

  3 to 8, the reference numeral 63 attached to the inner spindle 62 is a top forming part for forming the convex portion 11 and the top 11a, and the reference numeral 65 attached to the outer tool 61 is attached to the inner spindle 62. A recessed portion forming portion for forming the recessed portion 12 between the receiving portion 64 and a reference numeral 66 is a groove forming portion for forming the upper groove portion 44. As shown in FIG. 4, when the top molding portion 63 of the inner spindle 62 is at a position facing the outer tool 61, the top molding portion 63 is a relief portion of the outer tool 61 as shown in FIG. 5. 67 is pushed. At that time, both sides of the portion pushed by the top molding portion 63 of the cylindrical portion 42 are pressed by the concave molding portions 65 on both sides of the relief portion 67 as shown in FIG. The projecting convex portion 11 and the top portion 11a having the maximum projecting height in the axial direction of the cylindrical portion 42 are formed.

  On the other hand, as shown in FIGS. 6 and 7A, when the relief portion 64 of the inner spindle 62 is at a position facing the outer tool 61, the relief portion 64 of the inner spindle 62 and the recess formation of the outer tool 61 are formed. The part 65 faces. Then, the recess forming portion 65 is pushed into the escape portion 64 of the inner spindle 62. At this time, as shown in FIG. 6, both sides of the portion pushed by the recessed portion forming portion 65 of the cylindrical portion 42 are pressed by the top forming portions 63 on both sides of the relief portion 64, thereby projecting inward in the radial direction. The recess 12 is formed.

  In addition, the outer tool 61 is provided with a hook forming part 68 for forming the recessed part 12 having the hook part 15 as shown in FIG. The cylindrical portion 42 is pushed inward in the radial direction by the hook portion forming portion 68 at a position where the relief portion 64 of the inner spindle 62 and the hook portion forming portion 68 of the outer tool 61 face each other, so that the hook portion 15 is Molded.

  Subsequently, in the processing of the cylindrical portion 42, as shown in FIG. 3, each top molding portion 63 of the inner spindle 62 is placed in the outer order in ascending order of the numbers <1> to <26> attached to each top molding portion 63. By rotating and moving so as to face the tool 61, the shape of each convex portion 11 and the top portion 11 a is formed and the concave portion 12 is formed, and the convex portion 11 and the concave portion 12 are formed along the circumferential direction of the cylindrical portion 42. Alternately. Then, when the inner spindle 62 rotates to a position where the top forming portion 63 of the reference numeral <26> faces the outer tool 61, the processed cylindrical portion 42 becomes the reference numerals <1> to <7> and the reference numeral <20>. It is processed twice by the top forming part 63 shown by <26>. Thus, the entire circumference of the cylindrical portion 42 is processed without leaving a gap, and an overlap portion is formed in a region A indicated by the symbols <1> to <7> and the symbols <20> to <26>. .

  The convex part 11 which comprises an identification mark is arrange | positioned in the position which avoided this overlap part (area | region A), and in FIG. 3, five convex parts arrange | positioned in the area | region B shown by code | symbol <13>-<17>. It is comprised by the part 11. And in the five convex parts 11 formed in this area | region B, a different identification mark is comprised by the combination of the height position of each top part 11a.

Table 1 shows an example of identification marks formed by the five convex portions 11. The identification mark described in Table 1 is an example in the case where nine types of identification marks for identifying caps formed by nine different molds (knurlers) are configured by five convex portions 11. Reference numerals <13> to <17> in Table 1 correspond to reference signs <13> to <17> shown in FIG. In this case, as shown in FIG. 8, the apex portion 11 a of the convex portion 11 indicated by “A” has a height position in the axial direction that is the top surface portion 41 as compared with the convex portion 11 of the other portion indicated by the two-dot chain line. The distance H is shifted to the side. Moreover, it shows that the top part 11a of the convex part 11 shown by "-" is arrange | positioned in the same height position as the convex part 11 of the other part shown with a dashed-two dotted line.
For example, in the head # 1, the height position of the top portion 11a processed by the top forming portion 63 indicated by the reference numeral <13> is “A”, and the portions corresponding to the reference signs <14> to <17> are “−”. Therefore, it can be seen that only the top portion 11a at the position of <13> is arranged so as to be shifted as compared with the convex portion 11 of the other portion.

In this way, by forming the top portion 11a by shifting the height position (the axial direction position of the cylindrical portion 42) of the other projection portion 11 in at least one of the plurality of projection portions 11 provided, a plurality of types of projection portions 11 are formed. An identification mark can be provided.
Moreover, as the convex part 11 which has a shape different from the other convex part 11, as shown in FIG. 9, the circumferential direction of the cylindrical part 42 other than the shape which shifted the position of the top part 11a like the said embodiment. Convex ridges 11B along the axial direction of the cylindrical portion 42 in the direction orthogonal to the ridges 11A can be formed with respect to the other convex portions formed by the convex ridges 11A along. In this case, in any of the ridges 11A and 11B, the protruding height is a shape having a maximum at a predetermined position in the axial direction of the cylindrical portion 42, but the top of each of the ridges 11A and 11B is Since it can arrange | position in the same position of an axial direction, an identification mark can be provided, without impairing the design of a cap, and the grip feeling at the time of opening.
In addition, the shape of the convex part made into the shape different from another convex part is not limited to the shape of the said embodiment, Other shapes can also be used.

  And the position of the overlap part formed in the cylindrical part 42 can be judged clearly by the termination | terminus trace 48 formed in the slit 43 of the cylindrical part 42, for example, as shown in FIG. In this case, a group of convex portions 11 constituting an identification mark is formed at a position away from the end mark 48 by a certain distance, and manufactured by each facility according to the position and arrangement order of the top portions 11a of the convex portions 11. Cap information can be identified. On the other hand, the identification mark can be easily confirmed by confirming a position separated by a predetermined distance on the basis of the end mark 48 formed at the time of this rotational molding.

Then, the cap 1 formed in this way is capped in a state where the cap 1 is put on the cap part 21 of the bottle can 2, so that the cap 1 is attached while being wound around the cap part 21. The attached bottle can 3 is manufactured.
The capping process of the cap 1 is performed using a capping device including a pressure block, a screw roller, a skirt roller, and the like. That is, the top surface portion 41 of the cap body 4 placed on the base portion 21 is pressed toward the bottom of the bottle can 2 by a pressure block (not shown), and in this state, the drawing of the cap 1 is performed by the pressure block. A stepped portion 58 is formed on the shoulder.

  Further, in this state, the cap-side screw portion 56 is formed by a screw roller (not shown), and the pilfer proof portion 57 is wound around the bulging portion 22 of the base portion 21 by a skirt roller (not shown), thereby performing capping processing. Is done. In this case, the cap part 21 of the bottle can 2 to which the cap 1 (cap body 4) is attached is formed with a bottle-side screw part 23 and a bulging part 22, and the cap 1 covered here is The cap-side screw portion 56 and the pill fur proof portion 57 are plastically deformed so as to follow the shapes of the bottle-side screw portion 23, the bulging portion 22, and the like. As a result, the cap 1 is attached to the base portion 21 of the bottle can 2, the bottle can 2 is sealed, and the bottle can 3 with the cap is manufactured. At this time, the liner 5 is disposed inside the top surface portion 41 of the cap body 4 as described above, and the opening of the bottle can 2 is sealed by the liner 5.

In the bottle can 3 with the cap configured as described above, when the cap 1 is rotated to open the cap 1, the top 11 a is provided on each convex portion 11 forming the knurled portion 13. It can be easily gripped, and a high grip feeling can be given to the user.
Further, the cap 1 is provided with a cap identification mark by forming a convex portion having a shape different from that of the other convex portion 11 in at least one of the convex portions 11, and the defect is determined by the information of the attached identification mark. It is possible to immediately identify whether the generated cap is made by the equipment (Knurler). Moreover, since the difference in the shape of the identification mark is changed within a very small range of the convex portion forming portion, each cap can be identified without impairing the design of the cap and the grip feeling at the time of opening.

In addition, the difference in the shape of the convex part forming the identification mark is very slight, but by checking the identification mark with reference to the overlap part (double processed part) formed at the time of rotational molding, A convex part whose shape has been changed can be easily found from among the convex parts formed on the circumference.
In addition, in the overlap part, the shape of the convex part is processed in an overlapping manner, so the shape tends to collapse compared to the convex part formed in other parts, but the convex part of a different shape is the overlap part Therefore, even if the shape is slightly changed, it can be clearly formed so as to be distinguished from others. Furthermore, since the convex portions having different shapes are formed so as to avoid the overlap portions, the range of the knurled portions for confirming the convex portions having the different shapes is narrowed, and the identification marks can be easily found. Therefore, by providing the identification mark at a position avoiding the overlap portion, the identification mark can be reliably recognized even if the difference in shape is slight.

Moreover, since the top of each convex part is arranged below the maximum pushing part where the concave part is pushed inward in the radial direction in the axial direction of the cylindrical part, when capping the cap into the container Therefore, the recognition mark can be recognized well.
In the above embodiment, a plurality of types of identification marks are configured by changing the shape of the plurality of convex portions. However, since the overlapping portion is used as a reference, there is only one convex portion having a different shape. However, it is possible to identify a plurality of types of caps by changing the formation position of the convex portion whose shape has been changed in the circumferential direction of the cylindrical portion.

Next, a bottle can with a cap was produced using the cap of the present embodiment, a sensory test of cap opening was performed, and liner dropout (hook removal) at the time of opening and the visibility of the identification mark were evaluated. .
Each bottle can is an aluminum bottle can having a base portion with a 38 mm diameter, and a cap mounted on each bottle can is formed by using a cylindrical portion formed with 24 convex portions of a knurl portion. The mark was composed of ten convex portions counted from a position separated by a predetermined distance corresponding to two convex portions from the terminal trace formed in the slit of the overlapping portion among the convex portions. Note that seven convex portions are formed in the overlap portion. Table 2 shows the conditions for forming the convex portions of each cap.

In Examples 1 to 6 and Comparative Examples 1, 2, 4, and 5, as shown in FIG. 1, among ten convex portions used as identification marks, several convex portions constituting convex portions having different shapes are used. Parts (numbers shown in Table 2) were produced by shifting the position of the top to the top surface side by a distance H. The tops of the other convex parts are arranged at a position shifted by 3.5 mm from the top surface part of the cap toward the opening side, and the “distance H” in Table 2 is the top part whose position is shifted from the top part of these other convex parts. And the distance between the axial directions.
For the cap used in the test, the maximum pushing position of the concave portion is set to 2.5 mm from the cap top surface portion, and the upper groove portion is set to 5.0 mm from the cap top surface portion. It is set as the range of 3.5 mm or less exceeding 2.5 mm from a surface part.
Further, in Example 7 and Comparative Example 3, as shown in FIG. 9, among the ten convex portions used as the identification marks, several convex portions constituting the convex portions having different shapes are replaced with the cylindrical portion. It formed by the protruding line | wire along an axial direction, and the other convex part and the convex part of a different shape arrange | positioned the height of the top part in the same position of the axial direction of a cylindrical part.

  Then, the evaluation of the liner dropping at the time of opening was performed by producing bottle caps with caps equipped with caps and visually evaluating the caps opened for the respective bottle cans. Then, the number of hook parts from which the liner has come off and the number of bottle cans from which the hook has come off (hereinafter referred to as the number of cans from which the hook has come off) are examined to determine whether the hooks have come off. did.

The “hook off frequency” was calculated by the following equation.
Detachment frequency of hook = (number of hook parts removed × number of cans with hook release) ÷ number of cans For example, the number of evaluated cans is 30 cans, 2 hook parts come off with 2 cans, and 3 cans with 3 cans When one hook part comes off and four hook parts come off with three cans, it is calculated as follows.
((2 hooks × 2 cans) + (3 hooks × 3 cans) + (4 hooks × 3 cans)) ÷ 30 cans = 0.83 (frequency of hook removal)

  In addition, the “good / bad judgment” is “X” when there is a risk of liner dropping when the “hook off frequency” is 1.0 or more, and when it is 0.4 or more and less than 1.0, the liner does not drop. Was evaluated as “◯” because there was no problem of liner drop-off. In this example, 100 cans were evaluated at a low temperature of 5 ° C.

  The visibility of the identification mark was evaluated by visually evaluating the cap that was opened. The evaluation of the visibility of the identification mark evaluates the ease of identification of the identification mark, and when the identification mark is confirmed with reference to the overlap portion, the convex portion with the top position shifted is easily identified. “○” was evaluated as possible, and “×” was evaluated as being difficult to identify. These results are shown in Table 2.

As can be seen from the results in Table 2, the convex portions having different shapes constituting the identification mark can be formed by changing the position of the top portion or changing the direction of the ridges forming the convex portions. Even a shape changed within a very small range can be reliably identified.
In addition, even when the shape of the convex portion is changed in order to form the identification mark, the risk of the liner falling off is suppressed and good results are obtained for the caps of Examples 1 to 7 in which the shape change is made slight. Could get.
On the other hand, for the cap of Comparative Example 1, since the distance H was set to 0.5 mm, the top part whose position was changed could be easily identified, but the number of convex parts having the top part whose position was changed is , More than ¼ of the total (10), and a tendency to easily cause the liner to come off the hook was confirmed. In addition, it was confirmed that the caps of Comparative Example 3 and Comparative Example 5 in which seven convex portions having different shapes are formed tend to easily cause the liner to come off the hook.
Moreover, about the cap of the comparative example 2 which made the distance H 0.2mm, it was difficult to identify the top part of the convex part of a different shape easily, and resulted in a fall of visibility. Furthermore, with respect to the caps of Comparative Examples 4 and 5 in which the distance H is set to 1 mm, the top portion whose position has been changed is disposed at a position outside the formation region F, and is deformed at the time of capping processing, resulting in reduced visibility. became.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the said embodiment, although the cap with a cap and a cap with which a bottle can was equipped was demonstrated, the container of the container with a cap said by this invention is not limited to a bottle can, A bottle can In addition, containers such as glass bottles and PET bottles are also included.
Moreover, in the said embodiment, when changing the height position of a top part, it produces by shifting the top part of the convex part of a different shape from the position in which the top part of the other convex part was formed to the top | upper surface part side. However, it can also be produced by shifting toward the lower end side of the cylindrical part instead of the top side.

DESCRIPTION OF SYMBOLS 1 Cap 2 Bottle can 3 Cap bottle can 4 Cap main body 5 Liner 6 Knurler 11 Convex part 11a Top part 11A, 11B Convex line 12 Concave part 12a Maximum pushing part 13 Knurl part 14 Opening part 15 Hook part 21 Cap part 22 Swelling part 23 Bottle side screw part 41 Top surface part 42 Cylindrical part 43 Slit 43a Bridge 44 Upper groove part 45 Panel part 46 Cylinder upper part 47 Cylinder lower part 48 Termination trace 51 Sliding layer 52 Sealing layer 56 Cap side screw part 57 Pilfer proof part 58 Step part 61 Outer tool 62 Inner spindle 63 Top forming part 64 Relief part 65 Recessed part forming part 66 Groove forming part 67 Relief part 68 Hook part forming part

Claims (5)

A plurality of convex portions and concave portions that are alternately arranged in the circumferential direction in the vicinity of the top surface portion of the cylindrical portion on a cap body that includes a top surface portion and a cylindrical portion that is substantially suspended from the periphery of the top surface portion. A cap made of metal formed with a knurled portion, wherein the convex portion protrudes outward in the radial direction, and has a top portion whose protruding height is maximum at a predetermined position in the axial direction of the cylindrical portion. And at least one of the convex portions has a shape different from that of the other convex portions, and the convex portion having the different shape is formed by rotating the cap body along a circumferential direction of the cylindrical portion. parts and said recess is formed at a position avoiding the processed overlap portion to overlap and the molded end of the end molding and molding the starting end of the molding starts to be formed during rotational molding to be processed alternately Cap characterized by that.   The convex portion having the different shape is formed by disposing the top portion at a position shifted in the axial direction of the cylindrical portion as compared with the top portion of another convex portion. Cap.   The top part of the convex part of the said different shape and the top part of the said other convex part are the arrangement | positioning shifted | deviated more than 0.2 mm in the axial direction of the said cylindrical part, It is characterized by the above-mentioned. Cap.   4. The cap according to claim 1, wherein the number of convex portions having different shapes is equal to or less than ¼ of the number of convex portions constituting the knurl portion. 5.   The top portion is arranged below the maximum pushing portion in which the concave portion is pushed most radially inward in the axial direction of the cylindrical portion. Cap according to item.