JP7501873B2 - cap - Google Patents

Description

This disclosure relates to a cap.

Conventionally, cylindrical caps have been used as caps for beverage containers. Various improvements have been made to such caps to improve grip when opening them, such as increasing the outer diameter of the cap to make it easier to hold.

For example, a cap with an anti-slip device on the outer periphery of the cap has been proposed as a means for improving grip when opening the cap (for example, Patent Document 1). The cap shown in Patent Document 1 has an anti-slip device with a recess on its surface, which is made of a soft thermoplastic resin elastomer and is integrated with the cap body by two-color molding when it is molded.

JP 2004-196383 A

However, if the shape of the opening anti-slip material is complex, it may be difficult to spread the resin that forms the opening anti-slip material to the desired area when forming the opening anti-slip material by two-color molding. In this case, there is a possibility that a so-called short shot will occur, in which the outer peripheral surface of the cap body that should be covered by the opening anti-slip material becomes exposed. If such a short shot occurs, there is a risk that the quality of the product will deteriorate.

This disclosure has been made with these points in mind, and aims to provide a cap that allows injected resin to spread to the desired area.

A cap according to one embodiment of the present disclosure is a cap comprising a main body having a top plate and a cylindrical body extending downward from the outer periphery of the top plate, and an opening grip provided on the outer surface of the cylindrical body of the main body, the opening grip having a thin portion and a thick portion adjacent to the thin portion in the circumferential direction of the cylindrical body, and a convex portion protruding radially outward is formed on the portion of the cylindrical body covered by the thick portion.

In a cap according to one embodiment of the present disclosure, the opening grip may include an elastomer resin.

In a cap according to one embodiment of the present disclosure, a recess recessed radially inward is formed in a portion of the cylindrical body that is covered by the opening grip, the protrusion is formed within the recess, and the vertical position of the upper end of the protrusion may be gradually higher as it moves away from the circumferential center of the recess along the circumferential direction.

In a cap according to one embodiment of the present disclosure, the protrusions may be arranged symmetrically with respect to the circumferential center.

In a cap according to one embodiment of the present disclosure, the thin-walled portion may cover the circumferential center portion, and the thick-walled portion may cover portions located on both circumferential sides of the circumferential center portion.

In a cap according to one embodiment of the present disclosure, the protrusion may include a plurality of ribs spaced apart from one another along the circumferential direction.

The cap according to one embodiment of the present disclosure may further include a pilfer-proof band connected to the cylindrical body.

According to this disclosure, injected resin can be distributed to the desired area.

FIG. 1 is a perspective view showing a cap according to one embodiment. FIG. 2 is a front view showing a cap according to one embodiment. FIG. 3 is a plan view showing a cap according to one embodiment. FIG. 4 is an exploded perspective view of a cap according to one embodiment. FIG. 5 is a side view showing a main body portion of a cap according to one embodiment. FIG. 6A is a cross-sectional view (cross-sectional view taken along line VIA-VIA in FIG. 3) showing a cap according to one embodiment. FIG. 6B is a cross-sectional view (cross-sectional view taken along line VIB-VIB in FIG. 3) showing a cap according to one embodiment. FIG. 6C is a cross-sectional view (corresponding to the VIC portion of FIG. 6A) showing a modified example of the cap according to one embodiment. FIG. 7 is a cross-sectional view (cross-sectional view taken along line VII-VII in FIG. 2) showing a cap according to an embodiment. FIG. 8A is a cross-sectional view showing a first mold for making a cap according to one embodiment. FIG. 8B is a cross-sectional view of a second mold for making a cap according to one embodiment. 9A-9B are cross-sectional views showing a method for manufacturing a cap according to one embodiment. 9B(a)-(b) are cross-sectional views illustrating a method for manufacturing a cap according to one embodiment. 10A(a)-(b) are cross-sectional views showing a method for manufacturing a cap according to one embodiment. 10B(a)-(b) are cross-sectional views illustrating a method for manufacturing a cap according to one embodiment. 10C(a)-(b) are cross-sectional views illustrating a method for manufacturing a cap according to one embodiment. FIG. 11A is a plan view illustrating a modified example (first modified example) of the cap according to one embodiment. FIG. 11B is a perspective view showing a modified example (first modified example) of the cap according to one embodiment. FIG. 11C is a perspective view illustrating a main body of a modified example (first modified example) of the cap according to one embodiment. FIG. 12A is a plan view illustrating a modified example (second modified example) of the cap according to one embodiment. FIG. 12B is a perspective view illustrating a modified example (second modified example) of the cap according to one embodiment. FIG. 12C is a perspective view of a main body of a modified example (second modified example) of the cap according to one embodiment. FIG. 13A is a plan view illustrating a modified example (third modified example) of the cap according to one embodiment. FIG. 13B is a perspective view showing a modified example (third modified example) of the cap according to one embodiment. FIG. 13C is a perspective view illustrating a main body of a modified example (third modified example) of the cap according to one embodiment. FIG. 14A is a plan view illustrating a modification (fourth modification) of the cap according to one embodiment. FIG. 14B is a perspective view illustrating a modified example (fourth modified example) of the cap according to one embodiment. FIG. 14C is a perspective view illustrating a main body of a modified example (fourth modified example) of the cap according to one embodiment. FIG. 15 is a side view showing a main body of a modified example (fifth modified example) of the cap according to one embodiment. FIG. 16 is a cross-sectional view (cross-sectional view taken along line XVI-XVI in FIG. 15) showing a modified example (fifth modified example) of the cap according to the embodiment.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Figures 1 to 10C show an embodiment of the present disclosure.

1 to 7B, the cap according to the present embodiment is outlined. The cap according to the present embodiment can be suitably used for sealing containers such as spouted containers and PET bottles. In this specification, "upper" and "lower" refer to the upper and lower sides, respectively, of the cap 20 in an upright position (FIG. 2).

As shown in Figs. 1 to 4, the cap 20 includes a main body 50 having a top plate 30 and a cylindrical body 40 extending downward from the outer periphery 30e of the top plate 30, and an opening grip 60 provided on the outer surface of the cylindrical body 40 of the main body 50. The cap 20 may further include a plurality of opening assistant parts 61 provided on the small diameter part 41 of the cylindrical body 40 of the main body 50, which will be described later, and spaced apart from each other along the circumferential direction, and a plurality of radial parts 62 provided on the top plate 30 of the main body 50 and extending radially from the center of the top plate 30. The cap 20 may further include a pilfer-proof band 70 (see Figs. 1, 2 and 4) connected to the cylindrical body 40.

(Main body)
Next, the main body 50 of the cap 20 will be described. As described above, the main body 50 has the top plate 30 and the cylindrical body 40. The main body 50 also has a pedestal 46 that is provided below the cylindrical body 40 and has a polygonal shape in a plan view. Note that the shape of the pedestal 46 may be a circle or a composite shape of a polygon and a circle in a plan view.

As shown in Figures 3 and 4, the top plate 30 of the main body 50 is formed in a disk shape, and multiple radial grooves 31 are formed in the top plate 30, spreading radially from the center of the top plate 30. These radial grooves 31 serve as flow paths for injected resin when the radial portions 62, which will be described later, are formed by injection molding.

As shown in FIG. 4, the multiple radial grooves 31 include a pair of first portions 311 extending along the radial direction of the top plate 30, and second portions 312 that extend between the first portions 311 and have a generally fan-shaped shape. Of these, the groove depth of the first portions 311 is deeper than the groove depth of the second portions 312.

The shape and depth of the grooves in the first portion 311 and the second portion 312 can be changed as appropriate depending on the size of the cap 20. The radial groove 31 may also be composed of only the second portion 312.

In this embodiment, three radial grooves 31 are formed in the top plate 30. The radial grooves 31 are arranged at approximately equal intervals along the circumferential direction of the top plate 30. The three radial grooves 31 are connected to each other at a central portion 30c located at the center of the top plate 30.

As shown in FIG. 4 and FIG. 5, the plurality of radial grooves 31 are connected to the corresponding auxiliary grooves 43, which will be described later. In this case, the first portion 311 of the radial groove 31 is connected to the first portion 431 of the auxiliary groove 43, which will be described later, and the second portion 312 of the radial groove 31 is connected to the second portion 432 of the auxiliary groove 43, which will be described later. Since the plurality of radial grooves 31 are connected to the corresponding auxiliary grooves 43, when forming the uncapping grip 60, the injected resin that has passed through the radial groove 31 is supplied to the auxiliary groove 43. Therefore, when forming the uncapping grip 60, the uncapping auxiliary portion 61 can be easily formed. The number of radial grooves 31 can be arbitrarily changed based on the number of radial portions 62 to be formed.

As shown in Figures 1, 2, 4 and 5, the cylindrical body 40 of the main body 50 has a small diameter section 41 located below the top plate 30, a large diameter section 42 located below the small diameter section 41, and an annular groove 47 provided below the large diameter section 42. Of these, the small diameter section 41 is located in approximately the upper half of the cylindrical body 40. On the other hand, the large diameter section 42 is located in approximately the lower half of the cylindrical body 40.

The small diameter portion 41 and the large diameter portion 42 each have a generally cylindrical shape with a generally uniform diameter overall, and the large diameter portion 42 has a larger diameter than the small diameter portion 41. The small diameter portion 41 and the large diameter portion 42 may have a polygonal cylindrical shape, such as a hexagonal cylindrical shape or an octagonal cylindrical shape. In this case, the small diameter portion 41 and the large diameter portion 42 may have cylindrical shapes different from each other.

The small diameter portion 41 has a plurality of auxiliary grooves 43 arranged at a distance from each other along the circumferential direction. The auxiliary grooves 43 serve as flow paths for the injected resin when the unplugging auxiliary portion 61, which will be described later, is formed by injection molding.

As shown in Figures 4 and 5, the multiple auxiliary grooves 43 include a pair of first portions 431 extending in the up-down direction, a second portion 432 extending between the first portions 431, and a third portion 433 formed in the circumferential center of the second portion 432. Of these, the groove depths of the first portion 431 and the third portion 433 are each deeper than the groove depth of the second portion 432.

The shape and depth of the grooves in the first portion 431 and the second portion 432 can be changed as appropriate depending on the size of the cap 20. The auxiliary groove 43 may also be composed of only the second portion 432.

In this embodiment, three auxiliary grooves 43 are formed in the small diameter portion 41 (see FIG. 3). The auxiliary grooves 43 are arranged at approximately equal intervals along the circumferential direction of the small diameter portion 41. As described above, the upper ends of the auxiliary grooves 43 are connected to the corresponding radial grooves 31 provided in the top plate 30. As shown in FIG. 4 and FIG. 5, the lower ends of the auxiliary grooves 43 are connected to the corresponding grip grooves 44 described later. In this case, the third portion 433 of the auxiliary groove 43 is connected to the first portion 441 of the grip groove 44 described later, and the second portion 432 of the auxiliary groove 43 is connected to the second portion 442 of the grip groove 44 described later. The lower ends of the multiple auxiliary grooves 43 are connected to the corresponding grip grooves 44, so that when forming the uncapping grip 60, the injected resin that passes through the auxiliary grooves 43 is supplied to the grip groove 44. This makes it easy to form the uncapping grip 60.

In addition, multiple knurls K for capping are formed on the small diameter portion 41. The knurls K are arranged between adjacent auxiliary grooves 43 in the circumferential direction, and in this embodiment, five knurls K are provided between each pair of adjacent auxiliary grooves 43 in the circumferential direction, for a total of 15 knurls K. However, the number of knurls K may be more or less than this.

The large diameter portion 42 of the cylindrical body 40 is formed with a plurality of grip grooves (recesses) 44 that are spaced apart from one another along the circumferential direction. The grip grooves 44 are formed in the portion of the cylindrical body 40 that is covered by the opener grip 60, which will be described later, and are recessed radially inward. The grip grooves 44 serve as a flow path for injected resin when the opener grip 60, which will be described later, is formed by injection molding.

The multiple grip grooves 44 include a first portion 441 extending in the vertical direction, a second portion 442 extending on both sides of the first portion 441 along the circumferential direction of the large diameter portion 42, and a third portion 443 extending on both sides of the second portion 442 along the circumferential direction of the large diameter portion 42 and extending in the vertical direction. Of these, the groove depth of the first portion 441 is deeper than the groove depth of the second portion 442. Also, the groove depth of the second portion 442 is deeper than the groove depth of the third portion 443, but the groove depth of the second portion 442 gradually becomes shallower as it goes downward. This allows the injected resin passing through the second portion 442 to be supplied to the third portion 443 without being retained in the second portion 442.

The shape and depth of the grooves of the first portion 441, the second portion 442, and the third portion 443 can be changed as appropriate depending on the size of the cap 20. The grip groove 44 may be composed of only the third portion 443. Alternatively, the grip groove 44 may be composed of two portions, the third portion 443 and the first portion 441, or the third portion 443 and the second portion 442.

In this embodiment, three grip grooves 44 are formed in the large diameter portion 42 (see FIG. 3). The grip grooves 44 are arranged at approximately equal intervals along the circumferential direction of the large diameter portion 42. As described above, the upper ends of the grip grooves 44 are connected to the corresponding auxiliary grooves 43 provided in the small diameter portion 41. As shown in FIG. 4 and FIG. 5, the lower ends of the first portion 441 and the second portion 442 of the grip grooves 44 each terminate in the large diameter portion 42. In this case, the lower end of the first portion 441 is located lower than the lower end of the second portion 442. This allows the injected resin that has passed through the first portion 441 to be supplied to the third portion 443, improving the moldability of the opener grip 60.

On the other hand, the third portion 443 extends over the entire height of the large diameter portion 42. Note that the first portion 441 of the grip groove 44 may extend over the entire height of the large diameter portion 42.

The outer surface 421a between adjacent grip grooves 44 in the circumferential direction of the outer surface 42a of the large diameter portion 42 is formed in a straight line in a plan view.

The annular groove 47 provided below the large diameter portion 42 is formed around the entire circumference. This annular groove 47 serves to make the presence of burrs less noticeable even if burrs are generated due to the formation of an unintended gap between the main body portion 50 and the mold. In the region where the gripping groove 44 is provided, the depth D of the annular groove 47 (the amount of recession from the outer surface 42a radially inward, see FIG. 6C) is preferably 0.05 mm or more, and is preferably 50% or less of the thickness of the large diameter portion 42. By having the depth D be 0.05 mm or more, the mold can firmly receive the resin and suppress the generation of burrs. In addition, by having the depth D be 50% or less of the thickness of the large diameter portion 42, the thickness of the large diameter portion 42 can be suppressed from becoming too thin. In other words, the flow path of the resin forming the large diameter portion 42 can be suppressed from becoming too narrow, and the moldability of the large diameter portion 42 can be improved. In addition, by having the depth D be 50% or less of the thickness of the large diameter portion 42, the deterioration of the durability of the mold can be suppressed.

As shown in Figs. 4 and 5, a convex portion 10 that protrudes radially outward is formed in the cylindrical body 40 in a portion that is covered by a thick portion 66 of the uncapping gripping portion 60, which will be described later. This convex portion 10 is formed in the gripping portion groove (concave portion) 44 of the large diameter portion 42. In this embodiment, two convex portions 10 are formed in one gripping portion groove 44. In this way, the convex portion 10 that protrudes radially outward is formed in a portion that is covered by a thick portion 66 of the uncapping gripping portion 60, which will be described later, so that the flow of the injected resin that forms the uncapping gripping portion 60 can be controlled.

In other words, if the protrusion 10 is not formed in the portion of the uncapping grip 60 that is covered by the thick-walled portion 66 described below, the injected resin that reaches the third portion 443 from the first portion 441 and the second portion 442 of the gripping groove 44 flows vigorously toward the area where the thick-walled portion 66 is to be formed. This may result in the injected resin not reaching sufficiently the area where the thin-walled portion 65 described below of the uncapping grip 60 is to be formed.

In response to this, by forming the convex portion 10 in the portion of the uncapping grip portion 60 that is covered by the thick portion 66, the flow of the injected resin that has flowed into the area where the thick portion 66 is to be formed can be controlled. That is, the flow of the injected resin that has flowed into the area where the thick portion 66 is to be formed is impeded by the convex portion 10. The injected resin whose flow is impeded by the convex portion 10 is then guided to the area where the thin portion 65 is to be formed. This makes it easier for the injected resin that forms the uncapping grip portion 60 to spread throughout the entire grip portion groove 44. This makes it possible to suppress the occurrence of so-called short shots, in which the grip portion groove 44 is exposed from the uncapping grip portion 60.

As shown in FIG. 5, it is preferable that the vertical position of the upper end 10a of the convex portion 10 gradually becomes higher as it moves away from the circumferential center portion 440 of the grip groove 44 along the circumferential direction. As described later, the thin-walled portion 65 covers the circumferential center portion 440 of the grip groove 44, and the thick-walled portion 66 is located on both sides of the thin-walled portion 65 in the circumferential direction. For this reason, the injected resin that reaches the third portion 443 from the first portion 441 and the second portion 442 of the grip groove 44 flows vigorously from the circumferential center portion 440 of the grip groove 44 toward both sides of the circumferential center portion 440 in the circumferential direction. For this reason, the vertical position of the upper end 10a of the convex portion 10 gradually becomes higher as it moves away from the circumferential center portion 440 along the circumferential direction, thereby preventing the injected resin from flowing too far to both ends of the circumferential direction of the grip groove 44. This allows the injected resin that forms the uncapping grip 60 to spread evenly throughout the grip groove 44.

The vertical position of the lower end of the protrusion 10 may be generally uniform overall. In this case, the vertical position of the lower end of the protrusion 10 may be equal to the vertical position of the lower end of the grip groove 44.

The protrusions 10 are preferably arranged symmetrically with respect to the circumferential center portion 440. As described later, the thin-walled portion 65 covers the circumferential center portion 440 of the grip groove 44, and the thick-walled portion 66 covers the portions located on both sides of the circumferential center portion 440. Therefore, by arranging the protrusions 10 symmetrically with respect to the circumferential center portion 440, the injected resin that flows vigorously toward both sides of the circumferential center portion 440 can be evenly distributed throughout the grip groove 44. In the illustrated example, the protrusions 10 are arranged symmetrically with respect to the circumferential center portion 440. Although not shown, a single protrusion may be formed in the grip groove 44, and the single protrusion may have a shape symmetrical with respect to the circumferential center portion 440.

In this embodiment, the protrusion 10 includes a plurality of ribs 11 spaced apart from one another along the circumferential direction. In this case, the injected resin that forms the opening grip 60 flows between the plurality of ribs 11. This effectively prevents the opening grip 60 from moving along the circumferential direction relative to the main body 50 when the user rotates the cap 20 in the opening direction.

In the illustrated example, one protrusion 10 includes three ribs 11. That is, one protrusion 10 includes a first rib 11a, a second rib 11b farther from the circumferential center 440 than the first rib 11a, and a third rib 11c farther from the circumferential center 440 than the second rib 11b. As described above, the vertical position of the upper end 10a of the protrusion 10 may be gradually higher as it moves away from the circumferential center 440 of the grip groove 44 along the circumferential direction. Also, as described above, the vertical position of the lower end of the protrusion 10 may be approximately uniform as a whole. For this reason, the length (vertical distance) of each rib 11 may be gradually longer as it moves away from the circumferential center 440 of the grip groove 44 along the circumferential direction. That is, the length (L2) of the second rib 11b may be longer than the length (L1) of the first rib 11a, and the length (L3) of the third rib 11c may be longer than the length (L2) of the second rib 11b (L1<L2<L3). Note that one convex portion may include one or two ribs 11, or may include four or more ribs 11.

The ratio (L3/L2) of the length (L3) of the third rib 11c to the length (L2) of the second rib 11b is preferably equal to or greater than the ratio (L2/L1) of the length (L2) of the second rib 11b to the length (L1) of the first rib 11a ((L3/L2) ≧ (L2/L1)). As described above, the protrusion 10 (rib 11) plays a role in impeding the flow of the injected resin that has flowed into the area where the thick portion 66 is formed, and plays a role in making it easier for the injected resin to spread throughout the entire grip groove 44. This makes it easier for the injected resin that forms the uncapping grip 60 to spread throughout the entire grip groove 44. This further suppresses the occurrence of so-called short shots, in which the grip groove 44 is exposed from the uncapping grip 60.

As shown in Figures 6A and 6B, a downwardly protruding plug portion 32 is provided at approximately the center of the inner surface of the top plate 30 described above. An annular undercut 33 is provided at the tip of the plug portion 32, and the annular undercut 33 is configured to fit into the mouth of a container (not shown). Furthermore, a threaded portion 45 is formed on the inner surface of the large diameter portion 42 of the cylindrical body 40 described above, which screws into the threaded portion of the mouth of a container (not shown).

(Grip for opening)
Next, the opening grip portion 60 of the cap 20 will be described.

As shown in Figures 1 to 3, the uncapping grip 60 is provided on the outer surface 42a of the large diameter portion 42 of the cylindrical body 40. In this case, as described above, the large diameter portion 42 is located in approximately the lower half of the cylindrical body 40. Therefore, the uncapping grip 60 provided on the large diameter portion 42 is located in approximately the lower half of the cap 20. In this way, by providing the uncapping grip 60 on the large diameter portion 42, it is possible to make it easier for the user to grip the uncapping grip 60, and the grip of the cap 20 can be improved.

The uncapping grips 60 are spaced apart from one another along the circumferential direction of the cylindrical body 40, as shown in FIG. 3. This allows the amount of resin used to form the uncapping grips 60 to be reduced, thereby reducing the manufacturing cost of the cap 20. In this embodiment, three uncapping grips 60 are provided, and each uncapping grip 60 is arranged at approximately equal intervals along the circumferential direction of the large diameter portion 42. In addition, the outer surface 421a of the large diameter portion 42 of the cylindrical body 40 is exposed between the uncapping grips 60 adjacent to one another in the circumferential direction.

The number of uncapping grips 60 arranged is arbitrary, and each uncapping grip 60 may be arranged so as to be equally spaced at approximately 45° intervals in a plan view, or may be arranged so as to be equally spaced at approximately 72° intervals. In addition, the recessed portion 60b does not have to be provided on both circumferential sides of the first protrusion 60c of the uncapping grip 60.

3, each of the opening grips 60 has a first protrusion 60c located at the corner of a polygon (in this case, a regular hexagon) in a plan view and protruding radially outward, a recessed portion 60b located on both sides of the first protrusion 60c in the circumferential direction and recessed radially inward, and a second protrusion 60d located on both sides of the recessed portion 60b in the circumferential direction. The outer surface 60a of the outer surface of such an opening grip, where the first protrusion 60c, the recessed portion 60b, and the second protrusion 60d are not formed, is formed linearly in a plan view. In addition, the outer surface 60a adjacent to the outer surface 421a of the large diameter portion 42 exposed between the opening grips 60 adjacent to each other in the circumferential direction is formed to be located on the same plane as the outer surface 421a. As a result, the portion of the cap 20 where the opening grip 60 is formed in the vertical direction has a polygonal (in this case, regular hexagonal) outline in a plan view.

The first protrusion 60c has a greater height (radial distance) than the second protrusion 60d. In this way, the opening grip 60 has the first protrusion 60c and the second protrusion 60d, which improves the user's finger grip when opening the cap 20. These three opening grips 60 are each connected to an opening assistance part 61.

As described above, the opening grip 60 is provided on the outer surface 42a of the large diameter portion 42 of the cylindrical body 40, so that when the user opens the cap 20, the user's fingers can be improved in gripping the opening grip 60, and the grip of the cap 20 can be improved. That is, when the user opens the cap 20, the user's fingers first abut against the outer surface 42a of the large diameter portion 42 of the cylindrical body 40 exposed between the adjacent opening grips 60 or between the opening grips 60. Then, when the user rotates the cap 20 in the opening direction, the user's fingers hook on the first protrusion 60c and the second protrusion 60d of the opening grip 60. In this way, the user's fingers hook on the first protrusion 60c and the second protrusion 60d of the opening grip 60, and the grip of the cap 20 can be improved. This makes it easier to apply force to the cap 20 in the opening direction, making it easier to open the cap 20.

As shown in Figures 1 and 2, the opening grip 60 is provided so as to cover the entire outer surface 42a of the large diameter portion 42 of the cylindrical body 40 in the height direction. This allows the user's fingers to reliably contact the opening grip 60 when opening the cap 20, further improving the grip of the user's fingers on the opening grip 60.

7, the opener grip 60 has a thin wall portion 65 and a thick wall portion 66 adjacent to the thin wall portion 65 in the circumferential direction of the cylindrical body 40. The thin wall portion 65 covers the circumferential center portion 440 of the grip groove 44. On the other hand, the thick wall portion 66 covers the portions located on both sides of the circumferential center portion 440. That is, the thick wall portion 66 is located on both sides of the circumferential direction of the thin wall portion 65. Here, in this specification, the "thin wall portion" means a region whose thickness (the radial distance from the outer surface 42a of the large diameter portion 42 at the third portion 443 of the grip groove 44) is less than 0.8 mm. Also, the "thick wall portion" means a region whose thickness (the radial distance from the outer surface 42a of the large diameter portion 42 at the third portion 443 of the grip groove 44) is 0.8 mm or more.

As shown in FIG. 2, the base 46 of the main body 50 and the uncapping grip 60 are spaced apart in the vertical direction. This makes it possible to prevent burrs from forming on the lower surface 60e of the uncapping grip 60.

That is, when the base 46 of the main body 50 and the uncapping grip 60 are in contact with each other in the vertical direction, the injected resin forming the uncapping grip 60 is injected onto the base 46. On the other hand, the main body 50 having the base 46 is made of a synthetic resin material as described below. For this reason, when the uncapping grip 60 is formed by the injected resin, for example, the base 46 may be deformed by the injection pressure or heat, resulting in the formation of an unintended gap between the base 46 and the mold. In this case, the injected resin forming the uncapping grip 60 may get into the gap, causing burrs to form on the uncapping grip 60, covering the outer surface 46a of the base 46.

In contrast, in this embodiment, the base 46 of the main body 50 and the uncapping grip 60 are spaced apart in the vertical direction. In this case, as described later, the injected resin forming the uncapping grip 60 is injected onto the mold (specifically, onto the slide 83 of the second mold 80B described later, see FIG. 8B) rather than onto the base 46. That is, the injected resin forming the uncapping grip 60 is received by the mold. Therefore, even if an unintended gap is formed between the base 46 and the mold, the injected resin forming the uncapping grip 60 is received by the mold, so that the injected resin can be prevented from entering the gap. Therefore, it is possible to prevent the generation of burrs covering the outer surface 46a of the base 46 on the uncapping grip 60.

In this case, it is preferable that the uncapping grip 60 is spaced apart from the base 46 around the entire circumference of the cylindrical body 40. This makes it possible to prevent burrs from forming on the uncapping grip 60, covering the outer surface 46a of the base 46, around the entire circumference.

In addition, it is preferable that the distance L4 between the upper surface 46b of the base 46 and the lower surface 60e of the uncapping grip 60 is 0.3 mm or more and 3.0 mm or less. By making the distance L4 0.3 mm or more, when the cap 20 is manufactured, the thickness (vertical distance) of the protrusion 83b of the slide 83 described later, which is disposed between the upper surface 46b of the base 46 and the lower surface 60e of the uncapping grip 60, is 0.3 mm or more. This improves the durability of the protrusion 83b. In addition, by making the distance L4 3.0 mm or less, it is possible to prevent the design of the cap 20 from being deteriorated.

Furthermore, in a vertical cross section, it is preferable that the outer surface 60f of the uncapping grip 60 is located radially inward from the outer surface 46a of the base 46 or is located on the same plane as the outer surface of the base 46. This makes it possible to prevent the user's fingers from coming into contact with the underside 60e of the uncapping grip 60 when the user lifts a container (not shown). This makes it possible to prevent unintended forces from being applied to the uncapping grip 60, and to prevent the uncapping grip 60 from being peeled off from the main body 50.

(Opening aid)
Next, the uncorking assistant 61 will be described. As described above, the uncorking assistant 61 is provided on the small diameter portion 41 of the cylindrical body 40 of the main body 50. As described above, the small diameter portion 41 is disposed in approximately the upper half of the cylindrical body 40. Therefore, each uncorking assistant 61 provided on the small diameter portion 41 is disposed in approximately the upper half of the cap 20. In this way, by providing the uncorking assistant 61 on the small diameter portion 41, when the user uncorks the cap 20, the user's fingers come into contact with the uncorking assistant 61. This can further improve the grip of the user's fingers on the cap 20.

3, in this embodiment, the small diameter portion 41 is provided with three uncap assisting portions 61. The uncap assisting portions 61 are provided at positions corresponding to the above-mentioned auxiliary portion grooves 43, and the uncap assisting portions 61 are arranged so as to be equally spaced at approximately 120° intervals in a plan view. As shown in FIGS. 1 and 2, the uncap assisting portions 61 extend in the vertical and circumferential directions. The upper ends of the uncap assisting portions 61 are connected to the corresponding radial portions 62 provided on the top plate 30. The lower ends of the uncap assisting portions 61 are connected to the corresponding uncapping gripping portions 60 as described above. The uncap assisting portions 61 are provided by injection resin passing through the auxiliary portion grooves 43 when forming the uncapping gripping portions 60, as described later.

(Radial section)
Next, the radial portion 62 will be described. As described above, the radial portion 62 is provided on the top plate 30 of the main body 50. As shown in FIG. 1 to FIG. 3, in this embodiment, three radial portions 62 are provided on the top plate 30. The radial portions 62 are provided at positions corresponding to the above-mentioned radial portion grooves 31, and each has a substantially fan-shaped shape. The radial portions 62 are arranged so as to be equally spaced at approximately 120° intervals in a plan view. The three radial portions 62 are connected to each other at a central portion 62c located at the center of the top plate 30. Also, as described above, the multiple radial portions 62 are each connected to the corresponding uncapping assistant portion 61. The radial portions 62 are provided by injected resin passing through the radial portion grooves 31 when forming the uncapping grip portion 60, as described later. In the illustrated example, each radial portion 62 has a substantially fan-shaped shape, but this is not limited thereto. For example, although not shown, each of the radial portions 62 may have a substantially rectangular shape. In addition, although the three radial portions 62 are connected to each other at the central portion 62c, this is not limited thereto. For example, although not shown, the radial portions 62 may be connected to each other without providing the central portion 62c.

(Pilfer proof band)
Next, the pilfer-proof band will be described. As shown in Figures 2, 6A and 6B, the pilfer-proof band 70 is connected to the lower end of the cylindrical body 40 via a plurality of bridges 71 connected to the base 46. At least one of the bridges 71 is breakable. The pilfer-proof band 70 has a plurality of ring segments 70a that are divided in the circumferential direction. In this case, the ring segments 70a adjacent to each other in the circumferential direction are connected to each other by a breakable connecting member 72.

Because the cap 20 is provided with the pilfer-proof band 70 described above, it is possible to determine whether or not the cap 20 has been tampered with by checking whether the bridge 71 has been broken or whether or not the connecting member 72 has been broken.

In addition, a plurality of seats 73 are formed at the upper end of the pilfer-proof band 70, which are positioned in the circumferential direction so as to overlap with the polygonal first protrusions 60c of the opening gripper 60 of the cap 20. This makes it possible to suppress deformation of the pilfer-proof band 70 when the cap 20 is released from the second mold 80B (described later) by the cylindrical release part 84 (described later), allowing the cap 20 to be released smoothly.

Incidentally, of the above-mentioned cap 20, the main body 50, the pilfer-proof band 70, the bridge 71 and the connecting member 72 of the cap 20 can be integrally manufactured by injection molding a synthetic resin material. In this case, for example, PP (polypropylene), PE (polyethylene), etc. can be used as the material.

In addition, the above-mentioned uncapping grip 60, uncapping assistant 61, and radial portion 62 may contain an elastomer resin. By containing an elastomer resin in the uncapping grip 60, uncapping assistant 61, and radial portion 62, the anti-slip function of the cap 20 can be improved. In this case, the uncapping grip 60, uncapping assistant 61, and radial portion 62 may be made of the same material. By making the uncapping grip 60, uncapping assistant 61, and radial portion 62 of the same material, the uncapping grip 60, uncapping assistant 61, and radial portion 62 can be easily formed, and the productivity of the cap 20 can be improved. In this case, the elastomer resin may be a conventionally known thermoplastic elastomer, such as a styrene-based elastomer, an olefin-based elastomer, a urethane-based elastomer, a polyester-based elastomer, or a polyamide-based elastomer. These thermoplastic elastomers may be used alone or in combination of two or more.

Next, a first mold 80A and a second mold 80B for producing the cap 20 by injection molding a synthetic resin material will be described with reference to Figs . 8A and 8B.

As shown in FIG. 8A, the first mold 80A has a first cavity mold 81A for producing the main body 50 of the cap 20, a first core 82a and a second core 82b housed in the first cavity mold 81A, a pair of slides 83, and a cylindrical ejection part 84. Among these, the first cavity mold 81A has protrusions 31a, 43a, and 44a formed therein that correspond to the radial part groove 31, the auxiliary part groove 43, and the grip part groove 44 of the main body 50, respectively.

In addition, a gate (injection port) 81a for injecting injection resin is formed in the first cavity mold 81A at a position corresponding to the center of the top plate 30 of the main body 50. In this case, with the first core 82a and the second core 82b housed in the first cavity mold 81A, injection resin (e.g., polypropylene, polyethylene) is injected into the space formed by the first cavity mold 81A and the first core 82a and the second core 82b, thereby producing the main body 50 of the cap 20. In addition, a pair of slides 83 are formed with recesses 83a corresponding to the pilfer-proof bands 70.

On the other hand, as shown in FIG. 8B, the second mold 80B has a second cavity mold 81B for producing the uncapping grip portion 60, uncapping assist portion 61 and radial portion 62 of the cap 20, and the above-mentioned first core 82a and second core 82b, the above-mentioned pair of slides 83 and the above-mentioned cylindrical dispensing part 84 housed within the second cavity mold 81B.

Here, the space formed by the second cavity mold 81B and the first core 82a and the second core 82b is wider than the space formed by the first cavity mold 81A and the first core 82a and the second core 82b described above. Specifically, a space is formed between the main body 50 produced by the first mold 80A and the second cavity mold 81B. In this case, a gap is formed between the radial part groove 31, the auxiliary part groove 43, and the grip part groove 44 of the main body 50 and the second cavity mold 81B. Therefore, it is configured so that the uncapping grip part 60, the uncapping auxiliary part 61, and the radial part 62 can be formed on the outer circumferential surface of the main body 50 produced by the first mold 80A.

In addition, a gate (injection port) 81b for injecting the injection resin is formed in the second cavity mold 81B at a position corresponding to the center of the top plate 30 of the main body 50. In this case, the manufactured main body 50 and the first core 82a and the second core 82b are housed in the second cavity mold 81B, and the injection resin (e.g., elastomer resin) is injected into the space between the manufactured main body 50 and the second cavity mold 81B to form the opening grip 60, the opening auxiliary portion 61, and the radial portion 62 of the cap 20. Although not shown, the second cavity mold 81B has recesses and protrusions corresponding to the first protrusion 60c and the recess 60b of the opening grip 60.

The upper ends of the pair of slides 83 each have a protrusion 83b that protrudes radially inward. The protrusion 83b serves to receive the injected resin that forms the cap-opening grip 60.

Next, the operation of this embodiment will be described. Here, the manufacturing method of the cap 20 will be described with reference to Figures 9A to 10C.

Method for Manufacturing Cap First, a first mold 80A having a first cavity mold 81A, a first core 82a, a second core 82b, a pair of slides 83, and a cylindrical ejection part 84 is prepared.

Next, as shown in FIG. 9A(a), the first core 82a and the second core 82b are housed in the first cavity mold 81A, and the pair of slides 83 and the cylindrical delivery part 84 are attached. In this way, as shown in FIG. 9A(b), the first cavity mold 81A, the first core 82a, the second core 82b, the pair of slides 83, and the cylindrical delivery part 84 are clamped together.

Next, as shown in FIG. 9B(a), the injection resin is injected into the first mold 80A. At this time, the injection resin is injected from the gate 81a into the space formed by the first cavity mold 81A and the first and second cores 82a and 82b. For example, polypropylene or polyethylene can be used as the injection resin.

The injected resin penetrates between the first cavity mold 81A and the pair of slides 83 and the first core 82a and second core 82b, and the body 50 of the cap 20 and the pilfer-proof band 70 are molded by this injected resin. At this time, the first cavity mold 81A is formed with protrusions 31a, 43a, and 44a that respectively correspond to the radial portion groove 31, auxiliary portion groove 43, and grip portion groove 44 of the body 50 (see FIG. 8A). As a result, the radial portion groove 31, auxiliary portion groove 43, and grip portion groove 44 are respectively formed in the body 50.

Then, as shown in FIG. 9B(b), the first cavity mold 81A of the first mold 80A is removed from the fabricated main body 50.

Next, the second cavity mold 81B of the second mold 80B is prepared. Then, as shown in FIG. 10A(a), the second cavity mold 81B is attached to the prepared main body 50. In this way, as shown in FIG. 10A(b), the second cavity mold 81B, the first core 82a, the second core 82b, the pair of slides 83, and the cylindrical delivery part 84 are clamped together.

Next, as shown in FIG. 10B(a), injection resin is injected into the second mold 80B. At this time, the injection resin is injected from the gate 81b into the space between the second mold with cavity 81B and the main body 50. For example, an elastomer resin can be used as the injection resin.

The injected resin penetrates between the second cavity mold 81B and the main body 50. Here, the space between the second cavity mold 81B and the second core 82b is wider than the space between the first cavity mold 81A and the second core 82b. That is, a space is formed between the main body 50 attached to the second core 82b and the second cavity mold 81B. In this case, a gap is formed between the radial part groove 31, the auxiliary part groove 43, and the grip part groove 44 of the main body 50 attached to the second core 82b and the second cavity mold 81B. For this reason, the injected resin spreads radially from the center of the top plate 30 through the radial part groove 31 on the top plate 30 and reaches the auxiliary part groove 43. Then, the injected resin that reaches the auxiliary part groove 43 reaches the grip part groove 44. The injected resin then reaches the gripping groove 44 and spreads between the large diameter portion 42 of the cylindrical body 40 of the main body 50, the second cavity mold 81B, and the pair of slides 83, forming the uncapping gripping portion 60, uncapping assistance portion 61, and radial portion 62.

Here, a convex portion 10 is formed in the grip groove 44 of the large diameter portion 42. As a result, the flow of injected resin that flows into the region of the grip groove 44 where the thick portion 66 is formed is obstructed by the convex portion 10. The injected resin whose flow is obstructed by the convex portion 10 is then guided to the region of the grip groove 44 where the thin portion 65 is formed. As a result, the injected resin that forms the uncapping grip portion 60 spreads throughout the entire grip groove 44. This makes it possible to suppress the occurrence of a so-called short shot, in which the grip groove 44 is exposed from the uncapping grip portion 60.

The injected resin forming the uncapping grip 60 is received by the protruding portion 83b of the slide 83. Therefore, if an unintended gap is formed between the annular groove 47 and the slide 83, and the injected resin forming the uncapping grip 60 gets into the gap, the burrs will be contained within the annular groove 47. This makes it possible to prevent the occurrence of burrs on the uncapping grip 60 that would cover the outer surface 46a of the base 46.

In this manner, the cap 20 is obtained within the second mold 80B. Next, as shown in FIG. 10B(b), the second cavity mold 81B of the second mold 80B is removed from the produced cap 20. At this time, the first core 82a moves away from the second core 82b, and the pair of slides 83 slide in directions away from each other.

Next, as shown in FIG. 10C (a), the first core 82a and the second core 82b are removed from the cap 20.

Then, the cap 20 is removed by pressing the cylindrical dispensing part 84 against the cap 20. In this manner, the cap 20 is obtained, which includes the main body 50 and the opening grip 60 provided on the outer surface 42a of the cylindrical body 40 of the main body 50.

Here, the opening grip 60 is provided on the outer surface 42a of the large diameter portion 42 of the cylindrical body 40 (see Figures 1 to 3). This improves the grip of the user's fingers on the opening grip 60 when the user opens the cap 20. That is, when the user opens the cap 20, the user's fingers first come into contact with the outer surface 42a of the large diameter portion 42 of the cylindrical body 40 exposed between the adjacent opening grips 60 or between the opening grips 60. Then, when the user rotates the cap 20 in the opening direction, the user's fingers get caught on the first protrusion 60c and the second protrusion 60d of the opening grip 60. In this way, the user's fingers get caught on the first protrusion 60c and the second protrusion 60d of the opening grip 60, improving the grip of the cap 20. This makes it easier to apply force to the cap 20 in the opening direction, making it easier to open the cap 20.

As described above, according to this embodiment, the cap 20 includes a main body 50 having a top plate 30 and a cylindrical body 40 extending downward from the outer peripheral edge 30e of the top plate 30, and an opening grip 60 provided on the outer surface 42a of the cylindrical body 40 of the main body 50. The opening grip 60 also has a thin portion 65 and a thick portion 66 adjacent to the thin portion 65 in the circumferential direction of the cylindrical body 40. Furthermore, a convex portion 10 that protrudes radially outward is formed in the part of the cylindrical body 40 that is covered by the thick portion 66. This makes it possible to control the flow of the injected resin that has flowed into the area where the thick portion 66 is formed. That is, the flow of the injected resin that has flowed into the area where the thick portion 66 is formed is obstructed by the convex portion 10. The injected resin whose flow is obstructed by the convex portion 10 is guided to the area where the thin portion 65 is formed. This allows the injected resin that forms the uncapping grip 60 to spread throughout the desired area (i.e., the entire grip groove 44). This prevents the grip groove 44 from being exposed from the uncapping grip 60, which is known as a short shot.

In addition, according to this embodiment, the opening grip 60 contains an elastomer resin. This improves the anti-slip function of the cap 20. This makes it easier to open the cap 20.

In addition, according to this embodiment, the vertical position of the upper end 10a of the protrusion 10 gradually becomes higher as it moves away from the circumferential center 440 of the grip groove 44 in the circumferential direction. This makes it possible to prevent the injected resin from flowing too far to both circumferential ends of the grip groove 44. This allows the injected resin that forms the uncapping grip 60 to be evenly distributed throughout the entire grip groove 44.

In addition, according to this embodiment, the protrusions 10 are arranged symmetrically with respect to the circumferential center portion 440. The thin-walled portions 65 cover the circumferential center portion 440 of the grip groove 44, and the thick-walled portions 66 cover the portions located on both circumferential sides of the circumferential center portion 440. Therefore, by arranging the protrusions 10 symmetrically with respect to the circumferential center portion 440, the injected resin that flows vigorously toward both circumferential sides of the circumferential center portion 440 can be distributed evenly throughout the entire grip groove 44.

Furthermore, according to this embodiment, the protrusion 10 includes a plurality of ribs 11 arranged at a distance from one another along the circumferential direction. In this case, the injected resin forming the opening grip 60 flows between the plurality of ribs 11. Therefore, when the user rotates the cap 20 in the opening direction, the opening grip 60 can be effectively prevented from moving along the circumferential direction relative to the main body 50.

In the above-described embodiment, an example in which the pilfer-proof band 70 is connected via multiple bridges 71 has been described, but this is not limited to the above. For example, although not shown, the pilfer-proof band 70 may be connected to the cylindrical body 40 via a single bridge 71.

In the above embodiment, an example has been described in which the pilfer-proof band 70 has multiple ring segments 70a that are divided in the circumferential direction, but this is not limited to this. For example, although not shown, it may be composed of a single member.

Next, various modified examples of the cap will be described with reference to Figures 11A to 16. Figures 11A to 16 are diagrams showing various modified examples of the cap or the main body of the cap. In Figures 11A to 16, the same parts as those shown in Figures 1 to 10C are given the same reference numerals and detailed description will be omitted.

(First Modification)
11A and 11B show the cap 20 according to the first modified example. In Fig. 11A and 11B, the large diameter portion 42 and the uncapping gripping portion 60 of the cap 20 have a rectangular outline in a plan view. In this modified example, two uncapping gripping portions 60, two uncapping auxiliary portions 61, and two radial portions 62 are provided. In this modified example, as shown in Fig. 11C, two radial portion grooves 31, two auxiliary portion grooves 43, and two gripping portion grooves 44 are provided. In Fig. 11A to 11C, the knurling K and the first portions 311, 431, 441, etc. are omitted in order to clarify the drawings.

(Second Modification)
12A and 12B show the cap 20 according to the second modification. In FIG. 12A and FIG. 12B, the thick portion 66 covers the circumferential center portion 440 of the grip groove 44, and the thin portion 65 is located on both sides of the thick portion 66 in the circumferential direction. In FIG. 12A and FIG. 12B, the large diameter portion 42 and the uncapping grip portion 60 of the cap 20 have a rectangular outline in a plan view, as in the first modification. In this modification, the uncapping grip portion 60, the uncapping auxiliary portion 61, and the radial portion 62 are each provided in four pieces. In this modification, as shown in FIG. 12C, the radial portion groove 31, the auxiliary portion groove 43, and the grip groove 44 are each provided in four pieces. In FIG. 12A to FIG. 12C, the knurling K and the first portions 311, 431, 441, etc. are omitted in order to clarify the drawings.

(Third Modification)
13A and 13B show the cap 20 according to the third modification. In FIG. 13A and FIG. 13B, as in the second modification, the thick portion 66 covers the circumferential center portion 440 of the grip groove 44, and the thin portion 65 is located on both sides of the thick portion 66 in the circumferential direction. In addition, in FIG. 13A and FIG. 13B, the large diameter portion 42 and the uncapping grip portion 60 of the cap 20 have a triangular outline in a plan view. In addition, in this modification, the uncapping grip portion 60, the uncapping auxiliary portion 61, and the radial portion 62 are provided in three pieces each. Furthermore, in this modification, as shown in FIG. 13C, the radial portion groove 31, the auxiliary portion groove 43, and the grip groove 44 are provided in three pieces each. In addition, in FIG. 13A to FIG. 13C, the knurling K and the first portions 311, 431, 441, etc. are omitted from the illustration in order to clarify the drawings.

(Fourth Modification)
14A and 14B show the cap 20 according to the fourth modification. In FIG. 14A and FIG. 14B, as in the second modification, the thick portion 66 covers the circumferential center portion 440 of the grip groove 44, and the thin portion 65 is located on both sides of the thick portion 66 in the circumferential direction. In addition, in FIG. 14A and FIG. 14B, the large diameter portion 42 and the uncapping grip portion 60 of the cap 20 have a hexagonal contour in a plan view. In addition, in this modification, six uncapping grip portions 60, six uncapping auxiliary portions 61, and six radial portions 62 are provided. Furthermore, in this modification, as shown in FIG. 14C, six radial portion grooves 31, six auxiliary portion grooves 43, and six grip grooves 44 are provided. In addition, in FIG. 14A to FIG. 14C, the knurling K and the first portions 311, 431, 441, etc. are omitted from the illustration in order to clarify the drawings.

(Fifth Modification)
15 and 16 show the main body 50 of the cap 20 according to the fifth modified example. In FIG. 15, the protrusion 10 is formed in a trapezoidal shape when viewed from the front. A tapered portion 12 is formed around the protrusion 10. As shown in FIG. 16, the tapered portion 12 is formed so that the thickness gradually decreases as it moves away from the protrusion 10. This prevents the protrusion 10 from excessively interfering with the flow of the injected resin. This makes it easier for the injected resin forming the opening grip 60 to spread throughout the entire grip groove 44.

In the first to fifth modified examples described above, the occurrence of burrs on the underside 60e of the uncapping grip portion 60 can also be suppressed. In addition, the injected resin forming the uncapping grip portion 60 can be easily spread throughout the entire grip portion groove 44, and the occurrence of a so-called short shot, in which the grip portion groove 44 is exposed from the uncapping grip portion 60, can be suppressed.

The multiple components disclosed in the above embodiment and each modified example may be combined as needed. Alternatively, some components may be deleted from all the components shown in the above embodiment and each modified example.

REFERENCE SIGNS LIST 10: convex portion 10a: upper end 11: rib 20: cap 30: top plate 30e: outer periphery 40: cylindrical body 44: gripping groove 50: main body 60: gripping portion for opening 65: thin portion 66: thick portion 70: pilfer-proof band 440: circumferential center

Claims (7)

A main body portion having a top plate and a cylindrical body extending downward from an outer periphery of the top plate;
and an opening grip portion provided on an outer surface of the cylindrical body of the main body portion,
The unscrewing grip portion has a thin-walled portion and a thick-walled portion adjacent to the thin-walled portion in the circumferential direction of the cylindrical body,
A cap, wherein a convex portion protruding radially outward is formed on a portion of the cylindrical body that is covered by the thick-walled portion. The cap according to claim 1, wherein the opening grip portion includes an elastomer resin. The cap according to claim 1 or 2, wherein a recess is formed in the cylindrical body in a portion covered by the opening grip, the protrusion is formed within the recess, and the vertical position of the upper end of the protrusion gradually increases as it moves away from the circumferential center of the recess in the circumferential direction. The cap according to claim 3, wherein the protrusions are arranged symmetrically with respect to the circumferential center. The cap according to claim 3 or 4, wherein the thin-walled portion covers the circumferential center portion, and the thick-walled portion covers portions located on both sides of the circumferential center portion. The cap according to any one of claims 1 to 5, wherein the protrusion includes a plurality of ribs spaced apart from one another along the circumferential direction. The cap according to any one of claims 1 to 6, further comprising a pilfer-proof band connected to the tubular body.

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