cap

Abstract

To provide a cap which can suppress occurrence of burrs.SOLUTION: A cap 20 includes a body part 50 having a top plate 30, a cylindrical body 40 extending downward from an outer peripheral edge 30e of the top plate 30, and a pedestal 46 provided below the cylindrical body 40, and a gripping part 60 for opening provided on the outer surface of the cylindrical body 40 of the body part 50. The pedestal 46 and the gripping part 60 for opening are provided at an interval in a vertical direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a cap. [Background technology]

[0002] Conventionally, cylindrical caps have been used as caps for beverage containers. In order to improve the gripping ability when opening the cap, various improvements have been made to such caps, such as increasing the outer diameter of the cap to make it easier to hold.

[0003] For example, a cap with an anti-slip device for opening on the outer peripheral surface 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 for opening 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-196383 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the cap shown in Patent Document 1, when forming the non-slip opening portion, the outer peripheral surface of the cap body formed from the primary resin may be deformed by the injection pressure or heat of the secondary resin, which may cause burrs to form along the outer edge of the non-slip opening portion and cover the outer peripheral surface of the cap body. The occurrence of such burrs may result in a decrease in product quality.

[0006] The present disclosure has been made in consideration of these points, and has an object to provide a cap that can suppress the occurrence of burrs. [Means for solving the problem]

[0007] A cap according to one embodiment of the present disclosure comprises a main body having a top plate, a cylindrical body extending downward from the outer peripheral edge of the top plate, and a base provided below the cylindrical body, and an opening grip provided on the outer surface of the cylindrical body of the main body, wherein the base and the opening grip are spaced apart in the vertical direction.

[0008] In the cap according to one embodiment of the present disclosure, the opening grip portion may include an elastomer resin.

[0009] In the cap according to one embodiment of the present disclosure, the uncapping grip portion may be spaced apart from the base over the entire circumference of the cylindrical body.

[0010] In the cap according to the embodiment of the present disclosure, a distance between an upper surface of the base and a lower surface of the opening grip portion may be 0.3 mm or more and 3.0 mm or less.

[0011] In a cap according to one embodiment of the present disclosure, in a vertical cross section, the outer surface of the uncoating grip portion may be located radially inward from the outer surface of the base, or may be located on the same plane as the outer surface of the base.

[0012] The cap according to one embodiment of the present disclosure may further include a pilfer-proof band connected to the cylindrical body. Effect of the Invention

[0013] According to the present disclosure, the occurrence of burrs can be suppressed. [Brief description of the drawings]

[0014] [Figure 1]FIG. 1 is a perspective view showing a cap according to one embodiment. [Diagram 2] FIG. 2 is a front view showing a cap according to one embodiment. [Diagram 3] FIG. 3 is a plan view showing a cap according to one embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing a cap according to one embodiment. [Diagram 5] FIG. 5 is a side view showing a main body of a cap according to one embodiment. [Figure 6A] 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. [Figure 6B] FIG. 6B is a cross-sectional view (cross-sectional view taken along line VIB-VIB in FIG. 3) showing the cap according to one embodiment. [Figure 6C] FIG. 6C is a cross-sectional view (corresponding to the portion VIC in FIG. 6A) showing a modified example of the cap according to one embodiment. [Figure 7] FIG. 7 is a cross-sectional view (cross-sectional view taken along line VII-VII in FIG. 2) showing the cap according to one embodiment. [Figure 8A] FIG. 8A is a cross-sectional view showing a first mold for making a cap according to one embodiment. [Figure 8B] FIG. 8B is a cross-sectional view of a second mold for making a cap according to one embodiment. [Figure 9A] 9A(a)-(b) are cross-sectional views showing a method for manufacturing a cap according to one embodiment. [Figure 9B] 9B(a)-(b) are cross-sectional views showing a method for manufacturing a cap according to one embodiment. [Figure 10A] 10A(a)-(b) are cross-sectional views showing a method for manufacturing a cap according to one embodiment. [Figure 10B] 10B(a)-(b) are cross-sectional views showing a method for manufacturing a cap according to one embodiment. [Figure 10C] 10C(a)-(b) are cross-sectional views showing a method for manufacturing a cap according to one embodiment. [Figure 11A] FIG. 11A is a plan view showing a modified example (first modified example) of the cap according to one embodiment. [Figure 11B] FIG. 11B is a perspective view showing a modified example (first modified example) of the cap according to one embodiment. [Figure 11C] FIG. 11C is a perspective view showing a main body of a modified example (first modified example) of the cap according to one embodiment. [Figure 12A] FIG. 12A is a plan view showing a modified example (second modified example) of the cap according to one embodiment. [Figure 12B] FIG. 12B is a perspective view showing a modified example (second modified example) of the cap according to one embodiment. [Figure 12C] FIG. 12C is a perspective view showing a main body of a modified example (second modified example) of the cap according to one embodiment. [Figure 13A] FIG. 13A is a plan view showing a modified example (third modified example) of the cap according to one embodiment. [Figure 13B] FIG. 13B is a perspective view showing a modified example (third modified example) of the cap according to one embodiment. [Figure 13C] FIG. 13C is a perspective view showing a main body of a modified example (third modified example) of the cap according to one embodiment. [Figure 14A] FIG. 14A is a plan view showing a modification (fourth modification) of the cap according to one embodiment. [Figure 14B] FIG. 14B is a perspective view showing a modification (fourth modification) of the cap according to one embodiment. [Figure 14C] FIG. 14C is a perspective view showing a main body of a modified example (fourth modified example) of the cap according to one embodiment. [Figure 15] FIG. 15 is a side view showing a main body of a modified example (fifth modified example) of the cap according to one embodiment. [Figure 16] 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 one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Figures 1 to 10C are diagrams showing an embodiment of the present disclosure.

[0016] Cap Configuration First, an overview of the cap according to the present embodiment will be described with reference to Figures 1 to 7B. 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 (Figure 2).

[0017] 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 an outer peripheral edge 30e of the top plate 30, and an uncapping 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 uncapping assistant parts 61 provided on a small diameter part 41 (to be described later) of the cylindrical body 40 of the main body 50 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 radially extending 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.

[0018] (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.

[0019] 3 and 4, the top plate 30 of the main body 50 is formed in a disk shape, and a plurality of radial portion grooves 31 are formed in the top plate 30 and radiate from the center of the top plate 30. The radial portion grooves 31 serve as flow paths for injected resin when the radial portions 62 described below are formed by injection molding.

[0020] 4, the plurality of radial grooves 31 include a pair of first portions 311 extending along the radial direction of the top plate 30, and second portions 312 having a generally fan-shaped shape and extending between the first portions 311. Among these, the groove depth of the first portions 311 is deeper than the groove depth of the second portions 312.

[0021] The shape and depth of the grooves of the first portion 311 and the second portion 312 can be changed as appropriate according to the size of the cap 20. The radial portion groove 31 may be composed of only the second portion 312.

[0022] 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.

[0023] 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 portion 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 portion 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.

[0024] 1, 2, 4, and 5, the cylindrical body 40 of the main body 50 has a small diameter portion 41 disposed below the top plate 30, a large diameter portion 42 disposed below the small diameter portion 41, and an annular groove 47 provided below the large diameter portion 42. Of these, the small diameter portion 41 is disposed in approximately the upper half of the cylindrical body 40. On the other hand, the large diameter portion 42 is disposed in approximately the lower half of the cylindrical body 40.

[0025] 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.

[0026] A plurality of auxiliary grooves 43 are formed in the small diameter portion 41 and are spaced apart from one another along the circumferential direction. The auxiliary grooves 43 serve as flow paths for injected resin when the uncapping auxiliary portion 61, which will be described later, is formed by injection molding.

[0027] 4 and 5, the auxiliary part 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 portions 432. Of these, the groove depths of the first portions 431 and the third portions 433 are deeper than the groove depth of the second portion 432.

[0028] The shape and depth of the grooves of the first portion 431 and the second portion 432 can be changed as appropriate according to the size of the cap 20. In addition, the auxiliary portion groove 43 may be composed of only the second portion 432.

[0029] 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, which will be 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, which will be described later, and the second portion 432 of the auxiliary groove 43 is connected to the second portion 442 of the grip groove 44, which will be described later. The lower ends of the plurality of auxiliary grooves 43 are connected to the corresponding gripping grooves 44, so that when forming the uncapping gripping portion 60, the injected resin that has passed through the auxiliary grooves 43 is supplied to the gripping grooves 44. This makes it possible to easily form the uncapping gripping portion 60.

[0030] Further, a plurality of knurls K for capping are formed on the small diameter portion 41. The knurls K are disposed between the auxiliary part grooves 43 adjacent in the circumferential direction, and in this embodiment, a total of 15 knurls K are provided between each of the auxiliary part grooves 43 adjacent in the circumferential direction. However, the number of knurls K may be more or less than this.

[0031] A plurality of grip grooves (recesses) 44 are formed in the large diameter portion 42 of the cylindrical body 40 and are spaced apart from one another along the circumferential direction. The grip grooves 44 are formed in a portion of the cylindrical body 40 that is covered by the uncapping grip 60 described below, and are recessed radially inward. The grip grooves 44 serve as a flow path for injected resin when the uncapping grip 60 described below is formed by injection molding.

[0032] The plurality of 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. Among these, the depth of the groove of the first portion 441 is deeper than the depth of the groove of the second portion 442. Also, the depth of the groove of the second portion 442 is deeper than the depth of the groove of the third portion 443, but the depth of the groove of the second portion 442 gradually becomes shallower toward the bottom. 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.

[0033] The shape and depth of the grooves of the first portion 441, the second portion 442, and the third portion 443 can be appropriately changed according to the size of the cap 20. The grip portion groove 44 may be composed of only the third portion 443. Alternatively, the grip portion 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.

[0034] 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 at 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, thereby improving the moldability of the uncapping grip portion 60.

[0035] On the other hand, the third portion 443 extends over the entire height direction of the large diameter portion 42. Note that, in the grip portion groove 44, the first portion 441 may extend over the entire height direction of the large diameter portion 42.

[0036] Of the outer surface 42a of the large diameter portion 42, an outer surface 421a between the grip portion grooves 44 adjacent to each other in the circumferential direction is formed in a straight line in a plan view.

[0037] In addition, the annular groove 47 provided below the large diameter portion 42 is formed over 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 grip portion groove 44 is provided, the depth D of the annular groove 47 (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 making the depth D 0.05 mm or more, the mold can firmly receive the resin and suppress the generation of burrs. In addition, by making the depth D 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, it is possible to suppress the flow path of the resin forming the large diameter portion 42 from becoming too narrow, and the moldability of the large diameter portion 42 can be improved. In addition, by making the depth D 50% or less of the thickness of the large diameter portion 42, it is possible to suppress a decrease in the durability of the mold.

[0038] Here, as shown in Figures 4 and 5, a convex portion 10 that protrudes radially outward is formed in a portion of the cylindrical body 40 that is covered by a thick-walled portion 66 of the uncapping gripping portion 60, which will be described later. This convex portion 10 is formed in a gripping portion groove (recess) 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, by forming the convex portion 10 that protrudes radially outward in a portion of the uncapping gripping portion 60 that is covered by a thick-walled portion 66, which will be described later, it is possible to control the flow of the injected resin that forms the uncapping gripping portion 60.

[0039] That is, 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 later, the injected resin that reaches the third portion 443 of the grip groove 44 from the first portion 441 and the second portion 442 flows vigorously toward the region where the thick-walled portion 66 is to be formed. This may result in the injected resin not reaching sufficiently the region of the uncapping grip 60 where the thin-walled portion 65 described later is to be formed.

[0040] In response to this, by forming the convex portion 10 in the portion of the uncapping grip portion 60 covered by the thick portion 66, the flow of the injected resin flowing into the region where the thick portion 66 is to be formed can be controlled. That is, the flow of the injected resin flowing into the region where the thick portion 66 is to be formed is impeded by the convex portion 10. Then, the injected resin whose flow is impeded by the convex portion 10 is guided to the region where the thin portion 65 is to be formed. This makes it easier for the injected resin forming the uncapping grip portion 60 to spread throughout the entire grip portion groove 44. This makes it possible to suppress the occurrence of a so-called short shot, in which the grip portion groove 44 is exposed from the uncapping grip portion 60.

[0041] As shown in FIG. 5, it is preferable that 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 along the circumferential direction. As described later, the thin-walled portion 65 covers the circumferential center 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 440 of the grip groove 44 toward both sides of the circumferential center 440 in the circumferential direction. For this reason, the vertical position of the upper end 10a of the protrusion 10 gradually becomes higher as it moves away from the circumferential center 440 along the circumferential direction, so that it is possible to prevent the injected resin from flowing too far to both ends of the circumferential direction of the grip groove 44. Therefore, the injected resin for forming the uncapping grip portion 60 can be spread evenly throughout the entire grip portion groove 44 .

[0042] The vertical positions of the lower ends of the protrusions 10 may be generally uniform as a whole. In this case, the vertical positions of the lower ends of the protrusions 10 may be equal to the vertical positions of the lower ends of the grip grooves 44.

[0043] 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, since the protrusions 10 are arranged 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 illustrated, 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.

[0044] 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 forming 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.

[0045] In the illustrated example, one convex portion 10 includes three ribs 11. That is, one convex portion 10 includes a first rib 11a, a second rib 11b that is farther from the circumferential center portion 440 than the first rib 11a, and a third rib 11c that is farther from the circumferential center portion 440 than the second rib 11b. As described above, the vertical position of the upper end 10a of the convex portion 10 may gradually increase as it moves away from the circumferential center portion 440 of the groove 44 for the gripping portion along the circumferential direction. Also, as described above, the vertical position of the lower end of the convex portion 10 may be substantially uniform as a whole. For this reason, each rib 11 may gradually increase in length (vertical distance) as it moves away from the circumferential center portion 440 of the groove 44 for the gripping portion 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.

[0046] Incidentally, 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 convex portion 10 (rib 11) serves to obstruct the flow of the injection resin that has flowed into the region where the thick portion 66 is formed, and serves to make it easier for the injection resin to spread throughout the groove 44 for the gripping portion. Thereby, the injection resin forming the gripping portion 60 for opening the plug can spread more easily throughout the groove 44 for the gripping portion. For this reason, it is possible to further suppress the occurrence of a so-called short shot in which the groove 44 for the gripping portion is exposed from the gripping portion 60 for opening the plug.

[0047] 6A and 6B, a downwardly protruding plug portion 32 is provided at the approximate center of the inner surface of the top plate 30. 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, which screws into the threaded portion of the mouth of a container (not shown).

[0048] (Grip for opening) Next, the opening grip portion 60 of the cap 20 will be described.

[0049] 1 to 3, the uncapping grip portion 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 portion 60 provided on the large diameter portion 42 is located in approximately the lower half of the cap 20. By providing the uncapping grip portion 60 on the large diameter portion 42 in this manner, it is possible to make it easier for the user to grip the uncapping grip portion 60, and the gripping ability of the cap 20 can be improved.

[0050] As shown in Fig. 3, the uncapping gripping portions 60 are spaced apart from one another along the circumferential direction of the cylindrical body 40. This allows a reduction in the amount of resin used to form the uncapping gripping portions 60, thereby reducing the manufacturing cost of the cap 20. In this embodiment, three uncapping gripping portions 60 are provided, and the uncapping gripping portions 60 are arranged at approximately equal intervals along the circumferential direction of the large diameter portion 42. Furthermore, the outer surface 421a of the large diameter portion 42 of the cylindrical body 40 is exposed between the uncapping gripping portions 60 adjacent to one another in the circumferential direction.

[0051] The number of uncapping grips 60 to be arranged is arbitrary, and the uncapping grips 60 may be arranged at equal intervals of about 45° in a plan view, or may be arranged at equal intervals of about 72°. Also, the recesses 60b do not have to be provided on both circumferential sides of the first protrusion 60c of the uncapping grip 60.

[0052] 3, each of the uncapping grips 60 has a first protrusion 60c located at a corner of a polygon (in this case, a regular hexagon) in a plan view and protruding outward in the radial direction, a recessed portion 60b located on both sides of the first protrusion 60c in the circumferential direction and recessed inward in the radial direction, and a second protrusion 60d located on both sides of the recessed portion 60b in the circumferential direction. Among the outer surfaces of such uncapping grips, the outer surface 60a of the portion where the above-mentioned first protrusion 60c, the recessed portion 60b, and the second protrusion 60d are not formed is formed in a straight line in a plan view. Among the outer surfaces 60a, the outer surface 60a adjacent to the outer surface 421a of the large diameter portion 42 exposed between the uncapping 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 portion 60 is formed in the up-down direction has a polygonal outline (in this case, a regular hexagonal shape) in plan view.

[0053] The first protrusion 60c has a height (radial distance) greater than the second protrusion 60d. In this manner, the uncapping grip portion 60 has the first protrusion 60c and the second protrusion 60d, which improves the user's finger grip when uncapping the cap 20. The three uncapping grip portions 60 are each connected to an uncapping assistant portion 61.

[0054] 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 easily hooked on 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 come into contact with the adjacent opening grips 60 or the outer surface 42a of the large diameter portion 42 of the cylindrical body 40 exposed between the opening grips 60. Then, when the user rotates the cap 20 in the opening direction, the user's fingers are hooked on the first protrusion 60c and the second protrusion 60d of the opening grip 60. In this way, the user's fingers are hooked on the first protrusion 60c and the second protrusion 60d of the opening grip 60, so that the user's fingers can be easily hooked on 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 possible to open the cap 20 with ease.

[0055] 1 and 2, the uncapping 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 uncapping grip 60 when uncapping the cap 20, further improving the ease with which the user's fingers can be gripped on the uncapping grip 60.

[0056] As shown in FIG. 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 having a thickness (a radial distance from the outer surface 42a of the grip groove 44 at the third portion 443 of the grip groove 44 of the outer surface 42a of the large diameter portion 42) of less than 0.8 mm. In addition, the "thick wall portion" means a region having a thickness (a radial distance from the outer surface 42a of the large diameter portion 42 at the third portion 443 of the grip groove 44) of 0.8 mm or more.

[0057] 2, the base 46 of the main body 50 and the uncapping grip 60 are provided with a gap therebetween in the vertical direction, which makes it possible to prevent burrs from being formed on the lower surface 60e of the uncapping grip 60.

[0058] 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 later. 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, and an unintended gap may be formed between the base 46 and the mold. In this case, the injected resin forming the uncapping grip 60 may enter the gap, and burrs may be generated on the uncapping grip 60, covering the outer surface 46a of the base 46.

[0059] In contrast, in this embodiment, the base 46 of the main body 50 and the uncapping grip 60 are provided with a gap therebetween 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.

[0060] In this case, it is preferable that the uncapping grip portion 60 is separated from the base 46 over the entire circumference of the cylindrical body 40. This makes it possible to prevent the generation of burrs that cover the outer surface 46a of the base 46 on the uncapping grip portion 60 over the entire circumference.

[0061] In addition, the distance L4 between the upper surface 46b of the base 46 and the lower surface 60e of the uncapping grip 60 is preferably 0.3 mm or more and 3.0 mm or less. When the distance L4 is 0.3 mm or more, the thickness (vertical distance) of the protruding portion 83b of the slide 83 described below, which is disposed between the upper surface 46b of the base 46 and the lower surface 60e of the uncapping grip 60, becomes 0.3 mm or more when the cap 20 is manufactured. This improves the durability of the protruding portion 83b. In addition, when the distance L4 is 3.0 mm or less, the design of the cap 20 can be prevented from being deteriorated.

[0062] Furthermore, in the 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 can prevent the user's fingers from coming into contact with the lower surface 60e of the uncapping grip 60 when the user lifts up a container (not shown). This can prevent unintended force from being applied to the uncapping grip 60, and can prevent the uncapping grip 60 from being peeled off from the main body 50.

[0063] (Opening aid) Next, the uncap assistant 61 will be described. As described above, the uncap 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 uncap 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 uncap assistant 61 on the small diameter portion 41, when the user uncaps the cap 20, the user's fingers come into contact with the uncap assistant 61. This can further improve the grip of the user's fingers on the cap 20.

[0064] As shown in FIG. 3, in this embodiment, the small diameter portion 41 is provided with three uncap assistants 61. The uncap assistants 61 are provided at positions corresponding to the above-mentioned grooves 43 for the assistants, and the uncap assistants 61 are arranged so as to be equally spaced at intervals of about 120° in a plan view. As shown in FIG. 1 and FIG. 2, the uncap assistants 61 extend in the vertical direction and the circumferential direction. The upper ends of the uncap assistants 61 are connected to the corresponding radial portions 62 provided on the top plate 30. The lower ends of the uncap assistants 61 are connected to the corresponding uncap grips 60 as described above. The uncap assistants 61 are provided by injection resin passing through the grooves 43 for the assistants when forming the uncap grips 60, as described later.

[0065] (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 Figs. 1 to 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 the 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 radial portion 62 may have a substantially rectangular shape. In addition, the three radial portions 62 are connected to each other at the central portion 62c, but 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.

[0066] (Pilfer Proof Band) Next, the pilfer-proof band will be described. As shown in Fig. 2, Fig. 6A and Fig. 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 plurality of 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.

[0067] Because the cap 20 is provided with the pilfer-proof band 70 described above, it is possible to determine whether or not tampering with the cap 20 has occurred by checking whether the bridge 71 has been broken or by checking whether or not the connecting member 72 has been broken.

[0068] Furthermore, a plurality of seats 73 are formed at the upper end of the pill-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 pill-proof band 70 when the cap 20 is released from a second mold 80B (described later) by a cylindrical release part 84 (described later), allowing the cap 20 to be released smoothly.

[0069] Incidentally, among the above-mentioned cap 20, the main body 50 of the cap 20, the pilfer-proof band 70, the bridge 71 and the connecting member 72 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.

[0070] The uncapper grip 60, the uncapper assistant 61, and the radial portion 62 may contain an elastomer resin. The uncapper grip 60, the uncapper assistant 61, and the radial portion 62 contain an elastomer resin, thereby improving the anti-slip function of the cap 20. In this case, the uncapper grip 60, the uncapper assistant 61, and the radial portion 62 may be made of the same material. The uncapper grip 60, the uncapper assistant 61, and the radial portion 62 are made of the same material, thereby making it possible to easily form the uncapper grip 60, the uncapper assistant 61, and the radial portion 62, and thus improving the productivity of the cap 20. In this case, examples of the elastomer resin include conventionally known thermoplastic elastomers, such as styrene-based elastomers, olefin-based elastomers, urethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers. Moreover, these thermoplastic elastomers may be used alone or in combination of two or more.

[0071] Mold Configuration 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.

[0072] 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 dispensing 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.

[0073] In addition, a gate (injection port) 81a for injecting an 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, in a state in which the first core 82a and the second core 82b are accommodated in the first cavity mold 81A, an injection resin (e.g., polypropylene, polyethylene) is injected into a 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 recess 83a corresponding to the pilfer-proof band 70 is formed in the pair of slides 83.

[0074] On the other hand, as shown in Figure 8B, the second mold 80B has a second cavity mold 81B for producing the uncapping gripping portion 60, the uncapping auxiliary portion 61 and the 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, which are housed within the second cavity mold 81B.

[0075] 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.

[0076] In addition, a gate (injection port) 81b for injecting an 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, in a state in which the manufactured main body 50, the first core 82a, and the second core 82b are accommodated in the second cavity mold 81B, an injection resin (e.g., an elastomer resin) is injected into the space between the manufactured main body 50 and the second cavity mold 81B to form the uncapping grip 60, the uncapping assistant 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 protrusions 60c and the recesses 60b of the uncapping grip 60.

[0077] Further, a protruding portion 83b protruding radially inward is formed on the upper end of each of the pair of slides 83. This protruding portion 83b serves to receive the injected resin that forms the opening grip portion 60.

[0078] Next, the operation of this embodiment will be described below. Here, a method for manufacturing the cap 20 will be described with reference to Figures 9A to 10C.

[0079] Cap manufacturing method 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 dispensing part 84 is prepared.

[0080] 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 dispensing 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 dispensing part 84 are clamped together.

[0081] 9B(a), an 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, the first core 82a, and the second core 82b. For example, polypropylene or polyethylene can be used as the injection resin.

[0082] The injected resin penetrates between the first cavity mold 81A and the pair of slides 83 and the first core 82a and the second core 82b, and the injected resin forms the main body 50 of the cap 20 and the pillfer-proof band 70. At this time, the first cavity mold 81A has protrusions 31a, 43a, and 44a that respectively correspond to the radial portion groove 31, the auxiliary portion groove 43, and the grip portion groove 44 of the main body 50 (see FIG. 8A). As a result, the radial portion groove 31, the auxiliary portion groove 43, and the grip portion groove 44 are respectively formed in the main body 50.

[0083] Then, as shown in FIG. 9B(b), the first cavity mold 81A of the first mold 80A is removed from the manufactured main body portion 50.

[0084] Next, the second cavity mold 81B of the second mold 80B is prepared. Next, as shown in Fig. 10A(a), the second cavity mold 81B is attached to the manufactured 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.

[0085] 10B(a), an 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. As the injection resin, for example, an elastomer resin can be used.

[0086] 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 on the top plate 30 from the center of the top plate 30 through the radial part groove 31 and reaches the auxiliary part groove 43. The injected resin that reaches the auxiliary part groove 43 reaches the grip part groove 44. Thereafter, the injected resin that reaches the groove 44 for the gripping portion spreads between the large diameter portion 42 of the cylindrical body 40 of the main body 50, the second cavity mold 81B and a pair of slides 83, forming the gripping portion for uncapping 60, the uncapping auxiliary portion 61 and the radial portion 62.

[0087] Here, a convex portion 10 is formed in the grip portion groove 44 of the large diameter portion 42. As a result, the flow of the injected resin that has flowed into the region of the grip portion groove 44 where the thick portion 66 is formed is obstructed by the convex portion 10. Then, the injected resin whose flow is obstructed by the convex portion 10 is guided to the region of the grip portion 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 portion groove 44. This makes it possible to suppress the occurrence of a so-called short shot, in which the grip portion groove 44 is exposed from the uncapping grip portion 60.

[0088] Furthermore, the injected resin forming the uncapping grip portion 60 is received by the protruding portion 83b of the slide 83. Therefore, even if an unintended gap is formed between the annular groove 47 and the slide 83 and the injected resin forming the uncapping grip portion 60 gets into the gap, the burrs are contained within the annular groove 47. Therefore, it is possible to prevent the generation of burrs on the uncapping grip portion 60 that cover the outer surface 46a of the base 46.

[0089] In this manner, the cap 20 is obtained in 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 are slid in directions away from each other.

[0090] Next, the first core 82a and the second core 82b are removed from the cap 20, as shown in FIG. 10C(a).

[0091] The cap 20 is then 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.

[0092] Here, the opening grip 60 is provided on the outer surface 42a of the large diameter portion 42 of the cylindrical body 40 (see Figs. 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 or the second protrusion 60d of the opening grip 60. In this way, the user's fingers get caught on the first protrusion 60c or the second protrusion 60d of the opening grip 60, thereby improving the grip of the cap 20. This makes it easier to apply force to the cap 20 in the opening direction, making it possible to open the cap 20 with ease.

[0093] As described above, according to the present embodiment, the cap 20 includes the top plate 30, the cylindrical body 40 extending downward from the outer peripheral edge 30e of the top plate 30, the main body 50 having the pedestal 46 provided below the cylindrical body 40, and the uncapping grip 60 provided on the outer surface 42a of the cylindrical body 40 of the main body 50. The pedestal 46 and the uncapping grip 60 are provided at an interval in the vertical direction. This makes it possible to suppress the occurrence of burrs on the lower surface 60e of the uncapping grip 60. That is, the injected resin forming the uncapping grip 60 is received by the protruding portion 83b of the slide 83 of the second mold 80B. Therefore, even 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 are contained within the annular groove 47. Therefore, the occurrence of burrs on the uncapping grip 60 that cover the outer surface 46a of the base 46 can be suppressed.

[0094] Furthermore, according to this embodiment, the uncapping grip 60 contains an elastomer resin, which improves the anti-slip function of the cap 20. This makes it possible to easily uncap the cap 20.

[0095] Furthermore, according to this embodiment, the uncapping grip 60 is separated from the base 46 over 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, over the entire circumference.

[0096] Furthermore, according to this embodiment, in a vertical cross section, 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 up a container (not shown). This makes it possible to prevent unintended force from being applied to the uncapping grip 60, and to prevent the uncapping grip 60 from being peeled off from the main body 50.

[0097] In the above-described embodiment, an example in which the pillfer-proof band 70 is connected via a plurality of bridges 71 has been described, but the present invention is not limited to this. For example, although not shown in the drawings, the pillfer-proof band 70 may be connected to the cylindrical body 40 via a single bridge 71.

[0098] In the above-described embodiment, the pilfer-proof band 70 has a plurality of ring segments 70a that are divided in the circumferential direction, but the present invention is not limited to this. For example, although not shown, the pilfer-proof band 70 may be composed of a single member.

[0099] In the above-described embodiment, the protrusion 10 protruding radially outward is formed on the portion of the cylindrical body 40 that is covered by the thick-walled portion 66 of the opening grip portion 60, but the present invention is not limited to this. For example, although not shown, the protrusion 10 does not necessarily have to be formed.

[0100] Variations 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.

[0101] (First Modification) 11A and 11B show the cap 20 according to the first modified example. In FIG. 11A and FIG. 11B, the large diameter portion 42 and the uncapping grip portion 60 of the cap 20 have a rectangular outline in a plan view. In this modified example, two uncapping grip portions 60, two uncapping assistant portions 61, and two radial portions 62 are provided. In this modified example, as shown in FIG. 11C, two radial portion grooves 31, two assistant portion grooves 43, and two grip portion grooves 44 are provided. In FIG. 11A to FIG. 11C, the knurling K and the first portions 311, 431, 441, etc. are omitted for clarity of the drawings.

[0102] (Second Modification) 12A and 12B show the cap 20 according to the second modified example. 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 addition, 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 modified example. In addition, in this modified example, the uncapping grip portion 60, the uncapping auxiliary portion 61, and the radial portion 62 are provided in four pieces each. Furthermore, in this modified example, as shown in FIG. 12C, the radial portion groove 31, the auxiliary portion groove 43, and the grip groove 44 are provided in four pieces each. In addition, in order to clarify the drawings, the knurling K and the first portions 311, 431, 441, etc. are omitted from the illustrations in FIGS. 12A to 12C.

[0103] (Third Modification) 13A and 13B show the cap 20 according to the third modified example. In FIG. 13A and FIG. 13B, as in the second modified example, 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 modified example, the uncapping grip portion 60, the uncapping auxiliary portion 61, and the radial portion 62 are provided in three pieces each. Furthermore, in this modified example, 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.

[0104] (Fourth Modification) 14A and 14B show the cap 20 according to the fourth modified example. In FIG. 14A and FIG. 14B, as in the second modified example, 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 outline in a plan view. In this modified example, six uncapping grip portions 60, six uncapping auxiliary portions 61, and six radial portions 62 are provided. In addition, in this modified example, six radial portion grooves 31, six auxiliary portion grooves 43, and six grip grooves 44 are provided, as shown in FIG. 14C. In addition, in order to clarify the drawings, the knurling K and the first portions 311, 431, 441, etc. are omitted in FIGS. 14A to 14C.

[0105] (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 portion 60 to spread throughout the entire grip portion groove 44.

[0106] In the above-mentioned first to fifth modified examples, it is possible to prevent burrs from occurring on the lower surface 60e of the uncapping grip portion 60. Furthermore, it is possible to make it easier for the injected resin forming the uncapping grip portion 60 to spread throughout the grip portion groove 44, and it is possible to prevent the uncapping grip portion 60 from exposing the grip portion groove 44, which is known as a short shot.

[0107] It is also possible to combine the multiple components disclosed in the above embodiment and each modification as necessary. Alternatively, some components may be deleted from all the components shown in the above embodiment and each modification. [Explanation of symbols]

[0108] 20 Cap 30 Tabletop 30e Outer rim 40 Cylindrical body 46 Pedestal 46a Exterior 46b Top surface 50 Main body 60 Opening grip 60e bottom 60f external surface 70 Pilfer Proof Band

Claims

1. A main body portion which is an injection molded body having a top plate, a cylindrical body extending downward from an outer peripheral edge of the top plate, and a base provided below the cylindrical body; and an opening grip portion which is an injection molded body provided on the outer surface of the cylindrical body of the main body portion, The base and the opening grip are provided at an interval in the up-down direction, The distance between the upper surface of the base and the lower surface of the uncoating grip is 0.3 mm or more and 3.0 mm or less, A cap, wherein an annular groove recessed radially inward is formed in the cylindrical body between the base and the opening grip portion.

2. The cap of claim 1 further comprising a pilfer-proof band coupled to the base.

3. A main body portion which is an injection molded body having a top plate, a cylindrical body extending downward from an outer peripheral edge of the top plate, and a base provided below the cylindrical body; An opening grip portion which is an injection molded body provided on the outer surface of the cylindrical body of the main body portion; a pilfer-proof band connected to the base, The base and the opening grip are provided at an interval in the up-down direction, A cap, wherein an annular groove recessed radially inward is formed in the cylindrical body between the base and the opening grip portion.

4. The cap according to claim 1 , wherein the opening grip portion comprises an elastomer resin.

5. The cap according to claim 1 , wherein the opening grip portion is spaced apart from the base over an entire circumference of the cylindrical body.

6. The cap according to claim 1 , wherein in a vertical cross section, the outer surface of the opening grip portion is located radially inward from the outer surface of the base or is located on the same plane as the outer surface of the base.

Images