JP2022155018A - cap - Google Patents

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

The present disclosure relates to caps.

BACKGROUND ART Conventionally, cylindrical caps have been used as caps for beverage containers. In order to improve the grip when opening the cap, such a cap has been devised in various ways, such as increasing the outer diameter of the cap to make the cap easier to grip.

For example, as means for improving the grip when opening the cap, a cap has been proposed in which a non-slip for opening is provided on the outer peripheral surface of the cap (for example, Patent Document 1). The cap shown in Patent Document 1 is provided with a non-slip for opening that has a recessed portion on its surface. It is integrated when molding the cap body.

Japanese Patent Application Laid-Open No. 2004-196383

However, in the cap shown in Patent Document 1, when the anti-slip for opening is formed, the outer peripheral surface of the cap body formed of the primary side resin is deformed by the injection pressure, heat, etc. of the secondary side resin. As a result, burrs covering the outer peripheral surface of the cap body may occur along the outer edge of the anti-slip for opening. The occurrence of such burrs degrades product quality.

The present disclosure has been made in consideration of such points, and an object thereof is to provide a cap capable of suppressing the generation of burrs.

A cap according to an embodiment of the present disclosure includes a body portion having a top plate, a tubular body extending downward from an outer peripheral edge of the top plate, and a pedestal provided below the tubular body; and an unplugging grip provided on the outer surface of the cylindrical body of the cap, wherein the pedestal and the unplugging grip are spaced apart in the vertical direction.

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

In the cap according to one embodiment of the present disclosure, the opening grip may be spaced apart from the pedestal over the entire circumference of the cylindrical body.

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

In the cap according to one embodiment of the present disclosure, 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 flush with the outer surface of the base. may be located.

A cap according to an embodiment of the present disclosure may further include a pilfer proof band connected to the tubular body.

According to the present disclosure, it is possible to suppress the occurrence of burrs.

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

An embodiment of the present disclosure will be described below with reference to the drawings. 1 to 10C are diagrams illustrating one embodiment of the present disclosure.

Configuration of Cap First, the outline of the cap according to the present embodiment will be described with reference to FIGS. 1 to 7B. The cap according to the present embodiment can be suitably used, for example, when closing a spout-equipped container or a container such as a PET bottle. In this specification, the terms "upper" and "lower" respectively refer to the upper and lower sides when the cap 20 is erected (FIG. 2).

As shown in FIGS. 1 to 4, the cap 20 includes a body portion 50 having a top plate 30 and a tubular body 40 extending downward from an outer peripheral edge 30e of the top plate 30, and the tubular body 40 of the body portion 50. and an opening grip portion 60 provided on the outer surface of the cap. In addition, the cap 20 includes a plurality of opening assisting portions 61 provided on a small diameter portion 41 (described later) of the cylindrical body 40 of the body portion 50 and spaced apart from each other along the circumferential direction. A plurality of radial portions 62 provided on the top plate 30 and radially extending from the center of the top plate 30 may be further provided. Additionally, the cap 20 may also include a pilfer proof band 70 (see FIGS. 1, 2 and 4) connected to the tubular body 40. As shown in FIG.

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

As shown in FIGS. 3 and 4, the top plate 30 of the main body 50 is formed in a disc shape, and the top plate 30 has a plurality of radial grooves 31 extending radially from the center of the top plate 30 . formed. The radial portion groove 31 serves as a flow path for injected resin when the radial portion 62, which will be described later, is formed by injection molding.

As shown in FIG. 4 , the plurality of radial portion grooves 31 are composed of a pair of first portions 311 extending along the radial direction of the top plate 30 and a first portion extending between the first portions 311 and having a generally fan shape. 2 parts 312 . Among these, the depth of the groove of the first portion 311 is deeper than the depth of the groove of the second portion 312 .

Note that the shape and depth of the grooves of the first portion 311 and the second portion 312 can be appropriately changed according to the size of the cap 20 . Alternatively, the radial portion groove 31 may be composed of only the second portion 312 .

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

Further, as shown in FIGS. 4 and 5, the plurality of radial portion grooves 31 are connected to corresponding auxiliary portion grooves 43, which will be described later. In this case, the first portion 311 of the radial portion groove 31 is connected to the later-described first portion 431 of the auxiliary portion groove 43 , and the second portion 312 of the radial portion groove 31 is connected to the auxiliary portion groove 43 . is connected to a second portion 432 which will be described later. Since the plurality of radial grooves 31 are connected to the corresponding auxiliary grooves 43, the injected resin that has passed through the radial grooves 31 is used as an auxiliary It is configured to be supplied to the part groove 43 . Therefore, when forming the opening gripping portion 60, the opening assisting portion 61 can be easily formed. The number of radial portion grooves 31 can be arbitrarily changed based on the number of radial portions 62 to be formed.

As shown in FIGS. 1, 2, 4 and 5, the cylindrical body 40 of the body portion 50 includes a small diameter portion 41 arranged below the top plate 30 and a large diameter portion 41 arranged below the small diameter portion 41. It has a diameter portion 42 and an annular groove 47 provided below the large diameter portion 42 . Among them, the small diameter portion 41 is arranged in a substantially upper half region of the cylindrical body 40 . On the other hand, the large-diameter portion 42 is arranged at a substantially lower half position of the cylindrical body 40 .

The small-diameter portion 41 and the large-diameter portion 42 each have a substantially cylindrical shape with a substantially uniform diameter as a whole, 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 tubular shape such as a hexagonal tubular shape or an octagonal tubular shape. In this case, the small diameter portion 41 and the large diameter portion 42 may have different cylindrical shapes.

A plurality of auxiliary portion grooves 43 are formed in the small diameter portion 41 so as to be spaced apart from each other in the circumferential direction. The auxiliary portion groove 43 serves as a flow path for injected resin when an opening auxiliary portion 61, which will be described later, is formed by injection molding.

As shown in FIGS. 4 and 5, the plurality of auxiliary grooves 43 are composed of a pair of first portions 431 extending along the vertical direction, second portions 432 extending between the first portions 431, and second portions 432 extending between the first portions 431. and a third portion 433 formed circumferentially centrally of portion 432 . Among these, the depth of the grooves of the first portion 431 and the third portion 433 is deeper than the depth of the groove of the second portion 432 .

The shape and depth of the grooves of the first portion 431 and the second portion 432 can be appropriately changed according to the size of the cap 20 . Further, the auxiliary portion groove 43 may be composed of only the second portion 432 .

In this embodiment, three auxiliary portion grooves 43 are formed in the small diameter portion 41 (see FIG. 3). Each of the auxiliary portion grooves 43 is arranged at approximately equal intervals along the circumferential direction of the small diameter portion 41 . Further, as described above, the upper ends of the plurality of auxiliary portion grooves 43 are connected to the corresponding radial portion grooves 31 provided in the top plate 30 . Further, as shown in FIGS. 4 and 5, the lower ends of the plurality of auxiliary portion grooves 43 are connected to corresponding grip portion grooves 44, which will be described later. In this case, the third portion 433 of the auxiliary portion groove 43 is connected to a first portion 441 of the gripping portion groove 44 , which will be described later, and the second portion 432 of the auxiliary portion groove 43 is connected to the gripping portion groove 44 . is connected to a second portion 442 which will be described later. Since the lower ends of the plurality of auxiliary portion grooves 43 are connected to the corresponding gripping portion grooves 44, the injection resin that has passed through the auxiliary portion grooves 43 when forming the plug opening gripping portion 60 is , to the grip groove 44 . Therefore, the opening gripping portion 60 can be easily formed.

A plurality of knurls K for capping are formed in the small diameter portion 41 . The knurls K are arranged between the auxiliary portion grooves 43 adjacent in the circumferential direction. 15 in total are provided. 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 grooves (concave portions) 44 for gripping portions spaced apart from each other in the circumferential direction. The gripping groove 44 is formed in a portion of the cylindrical body 40 that is covered with the plug-opening gripping portion 60 described later, and is recessed radially inward. The gripping groove 44 serves as a flow path for injected resin when the opening gripping portion 60, which will be described later, is formed by injection molding.

The plurality of gripping grooves 44 are composed of 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 the large diameter portion 42 . It includes a third portion 443 that extends along both sides of the second portion 442 in the circumferential direction and extends along 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 downward. . As a result, the injected resin passing through the second portion 442 can be supplied to the third portion 443 without remaining 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 appropriately changed according to the size of the cap 20 . Alternatively, the groove for gripping portion 44 may be composed of only the third portion 443 . Alternatively, the grip groove 44 may be composed of two parts, the third part 443 and the first part 441 , or two parts, the third part 443 and the second part 442 .

In this embodiment, the large-diameter portion 42 is formed with three grooves 44 for gripping portions (see FIG. 3). Each gripping groove 44 is arranged at approximately equal intervals along the circumferential direction of the large diameter portion 42 . Further, as described above, the upper ends of the plurality of gripping portion grooves 44 are connected to the corresponding auxiliary portion grooves 43 provided in the small diameter portion 41 . Further, as shown in FIGS. 4 and 5 , the lower ends of the first portion 441 and the second portion 442 of the plurality of grooves 44 for gripping portion terminate at the large diameter portion 42 respectively. In this case, the lower end of the first portion 441 is positioned below the lower end of the second portion 442 . As a result, the injected resin that has passed through the first portion 441 can be supplied to the third portion 443, and the moldability of the opening grip portion 60 can be improved.

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

Of the outer surface 42a of the large-diameter portion 42, the outer surface 421a between the gripping grooves 44 adjacent to each other in the circumferential direction is formed linearly in plan view.

An annular groove 47 provided below the large-diameter portion 42 is formed over the entire circumference. The annular groove 47 plays a role of making the presence of burrs inconspicuous even when burrs are generated due to an unintended gap being formed between the body portion 50 and the mold. In the region where the groove for gripping portion 44 is provided, the depth D of the annular groove 47 (the amount of recession inward in the radial direction from the outer surface 42a; see FIG. 6C) is preferably 0.05 mm or more. It is preferably 50% or less of the thickness of the portion 42 . When the depth D is 0.05 mm or more, the mold can firmly receive the resin and suppress the occurrence of burrs. Moreover, since the depth D is 50% or less of the thickness of the large-diameter portion 42, it is possible to prevent the thickness of the large-diameter portion 42 from becoming too thin. That is, it is possible to prevent the passage 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. Moreover, since the depth D is 50% or less of the thickness of the large-diameter portion 42, it is possible to suppress deterioration in the durability of the mold.

Here, as shown in FIGS. 4 and 5, in the portion of the cylindrical body 40 that is covered with a later-described thick portion 66 of the gripping portion 60 for opening, the convex portion 10 projecting radially outward is formed. formed. The convex portion 10 is formed in a groove (concave portion) 44 for a grasping portion of the large diameter portion 42 . In the present embodiment, two protrusions 10 are formed in one gripping groove 44 . In this way, the convex portion 10 protruding radially outward is formed in a portion of the gripping portion 60 for opening that is covered with a thick portion 66, which will be described later, thereby forming the gripping portion 60 for opening. The injection resin flow can be controlled.

That is, when the protrusion 10 is not formed in the portion covered with the later-described thick portion 66 of the gripping portion 60 for opening, the first portion 441 and the second portion 442 to the third portion 443 of the groove 44 for gripping portion 44 are formed. The injected resin that has reached the point flows vigorously toward the area where the thick portion 66 is formed. As a result, there is a possibility that the injection resin will not be sufficiently distributed in the area where the later-described thin portion 65 of the cap-opening grip portion 60 is formed.

On the other hand, since the convex portion 10 is formed in the portion covered with the thick portion 66 of the opening grip portion 60, the flow of the injected resin flowing into the area where the thick portion 66 is formed is suppressed. can be controlled. 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 . Then, the injected resin whose flow is obstructed by the convex portion 10 is guided to the region where the thin portion 65 is formed. This makes it easier for the injected resin forming the opening gripping portion 60 to spread over the entire gripping portion groove 44 . Therefore, it is possible to suppress the occurrence of a so-called short shot in which the groove for gripping portion 44 is exposed from the gripping portion for opening 60 .

As shown in FIG. 5, the vertical position of the upper end 10a of the projection 10 gradually increases along the circumferential direction away from the circumferential central portion 440 of the groove 44 for the gripping portion. preferable. As will be described later, the thin portion 65 covers the circumferential central portion 440 of the gripping portion groove 44 , and the thick portions 66 are positioned on both sides of the thin portion 65 in the circumferential direction. Therefore, the injected resin that has reached the third portion 443 from the first portion 441 and the second portion 442 of the groove 44 for the gripping portion flows from the center portion 440 in the circumferential direction of the groove 44 for gripping portion to the center portion 440 in the circumferential direction. flows vigorously toward both sides in the circumferential direction of the For this reason, the vertical position of the upper end 10a of the projection 10 gradually increases as it moves away from the circumferential central portion 440 along the circumferential direction, so that the groove 44 for the gripping portion increases in the circumferential direction. It is possible to prevent the injected resin from flowing too much to both ends. Therefore, the injection resin forming the opening gripping portion 60 can be spread evenly over the entire gripping portion groove 44 .

In addition, the vertical position of the lower end of the convex portion 10 may be substantially uniform as a whole. In this case, the vertical position of the lower end of the convex portion 10 may be equal to the vertical position of the lower end of the grip portion groove 44 .

The convex portions 10 are preferably arranged symmetrically with respect to the circumferential central portion 440 . As will be described later, the thin portion 65 covers the circumferential central portion 440 of the grip portion groove 44 , and the thick portion 66 covers portions located on both sides of the circumferential central portion 440 in the circumferential direction. . For this reason, since the protrusions 10 are arranged symmetrically with respect to the circumferential center portion 440, the injected resin that vigorously flows toward both sides of the circumferential center portion 440 in the circumferential direction is caused to flow into the grip portion grooves. 44 can be distributed evenly. In the illustrated example, each convex portion 10 is arranged symmetrically with respect to the circumferential central portion 440 . Although not shown, a single convex portion may be formed in the gripping groove 44 and the single convex portion may have a symmetrical shape with respect to the center portion 440 in the circumferential direction.

In this embodiment, the protrusion 10 includes a plurality of ribs 11 spaced apart from each other in the circumferential direction. In this case, the injection resin that forms the opening grip portion 60 flows between the plurality of ribs 11 . Therefore, when the user rotates the cap 20 in the opening direction, it is possible to effectively prevent the opening grip portion 60 from moving in the circumferential direction with respect to the main body portion 50 . .

In the illustrated example, one protrusion 10 includes three ribs 11 . That is, one convex portion 10 includes a first rib 11a, a second rib 11b farther from the circumferential center portion 440 than the first rib 11a, and a second rib 11b farther from the circumferential center portion 440 than the second rib 11b. 3 ribs 11c. As described above, the vertical position of the upper end 10a of the convex portion 10 may gradually increase from the circumferential central portion 440 of the grip portion groove 44 along the circumferential direction. Further, as described above, the vertical positions of the lower ends of the projections 10 may be substantially uniform as a whole. For this reason, each rib 11 may gradually increase in length (vertical distance) from the circumferential central portion 440 of the gripping groove 44 along the circumferential direction. . That is, the length (L2) of the second rib 11b is longer than the length (L1) of the first rib 11a, and the length (L3) of the third rib 11c is longer than the length (L2) of the second rib 11b. may be longer (L1<L2<L3). In addition, one convex portion may include one or two ribs 11 , or may include four or more ribs 11 .

By the way, the ratio (L3/L2) between the length (L3) of the third rib 11c and the length (L2) of the second rib 11b is the length (L2) of the second rib 11b and the length (L2) of the first rib 11a. (L3/L2)≧(L2/L1)). As described above, the convex portion 10 (rib 11) plays a role of blocking the flow of the injected resin that has flowed into the region where the thick portion 66 is formed, so that the injected resin spreads over the entire grip portion groove 44. play a role in facilitating This makes it easier for the injected resin forming the opening gripping portion 60 to spread over the entire gripping portion groove 44 . Therefore, it is possible to further suppress the occurrence of a so-called short shot, in which the groove for gripping portion 44 is exposed from the gripping portion for opening 60 .

In addition, as shown in FIGS. 6A and 6B, a plug portion 32 protruding downward is provided in a substantially central portion of the inner surface of the top plate 30 described above. Further, 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). Further, a threaded portion 45 is formed on the inner surface of the large-diameter portion 42 of the cylindrical body 40 described above to be screwed to the threaded portion of the mouth portion of the container (not shown).

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

As shown in FIGS. 1 to 3 , the opening handle 60 is provided on the outer surface 42 a of the large diameter portion 42 of the cylindrical body 40 . In this case, as described above, the large-diameter portion 42 is arranged in the substantially lower half region of the tubular body 40 . For this reason, the opening gripping portion 60 provided on the large diameter portion 42 is arranged in a substantially lower half region of the cap 20 . By providing the opening grip 60 on the large-diameter portion 42 in this way, the user can easily grip the opening grip 60, and the grip of the cap 20 can be improved. .

As shown in FIG. 3, the opening grips 60 are spaced apart from each other along the circumferential direction of the tubular body 40 . As a result, the amount of resin used to form the opening grip portion 60 can be reduced, and the manufacturing cost of the cap 20 can be reduced. In this embodiment, three unplugging grips 60 are provided, and the respective unplugging grips 60 are arranged at approximately equal intervals along the circumference 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 opening gripping portions 60 adjacent to each other in the circumferential direction.

The number of unplugging grips 60 to be arranged is arbitrary. You may arrange|position so that it may become equipartition every 72 degrees. Further, the depressions 60b may not be provided on both circumferential sides of the first projection 60c of the opening grip 60. As shown in FIG.

In addition, as shown in FIG. 3 , each of the capping grips 60 includes a corner portion of a polygon (in this case, a regular hexagon) in a plan view and protruding radially outward. 1 projection 60c, recessed portions 60b arranged on both sides in the circumferential direction of the first projection 60c and recessed radially inward, and second projections 60d arranged on both sides in the circumferential direction of the recessed portion 60b. is doing. Out of the outer surface of such a grip for opening, the outer surface 60a of the portion where the above-described first projection 60c, recessed portion 60b, and second projection 60d are not formed is linearly formed in plan view. . In addition, the outer surface 60a adjacent to the outer surface 421a of the large-diameter portion 42 exposed from between the opening gripping portions 60 adjacent to each other in the circumferential direction is positioned on the same plane as the outer surface 421a. is formed in As a result, the portion of the cap 20 in which the opening gripping portion 60 is formed in the vertical direction has a polygonal (regular hexagonal in this case) outline in plan view.

The first protrusion 60c has a higher height (radial distance) than the second protrusion 60d. As described above, the opening grip part 60 has the first protrusion 60c and the second protrusion 60d, so that the user's finger gripping ability when opening the cap 20 can be improved. . The three unplugging grips 60 are each connected to an unplugging assisting portion 61 .

As described above, the opening gripping portion 60 is provided on the outer surface 42a of the large diameter portion 42 of the tubular body 40, so that the opening gripping portion 60 can be easily opened by the user when opening the cap 20. It is possible to improve the gripping property of the user's finger on the cap 20, and improve the gripping property of the cap 20. - 特許庁That is, when the user opens the cap 20 , the user's fingers first move the opening grips 60 adjacent to each other and the cylindrical body 40 exposed between the opening grips 60 . It abuts on the outer surface 42 a of the large diameter portion 42 . Then, when the user rotates the cap 20 in the unplugging direction, the user's fingers are caught on the first projection 60c and the second projection 60d of the gripping portion 60 for opening. In this manner, since the user's fingers are caught on the first projection 60c and the second projection 60d of the unplugging grip portion 60, the user's finger gripping property on the unplugging grip portion 60 can be improved. and the grip of the cap 20 can be improved. Therefore, force in the opening direction can be easily applied to the cap 20, and the cap 20 can be easily opened.

As shown in FIGS. 1 and 2, the opening handle 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. As a result, when the user opens the cap 20, the user's finger reliably abuts the opening grip portion 60, further improving the user's finger grip on the opening grip portion 60. can be made

As shown in FIG. 7 , the opening grip 60 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 . The thin portion 65 covers the circumferential central portion 440 of the groove 44 for gripping portion. On the other hand, the thick portion 66 covers portions located on both sides of the circumferential center portion 440 in the circumferential direction. That is, the thick portion 66 is located on both sides of the thin portion 65 in the circumferential direction. Here, in this specification, the “thin portion” means that the thickness (of the outer surface 42a of the large diameter portion 42, the radial distance from the outer surface 42a in the third portion 443 of the groove 44 for the gripping portion) is 0.8 mm. means the area of less than In addition, the “thick portion” means a region having a thickness (of the outer surface 42a of the large-diameter portion 42, the radial distance from the outer surface 42a of the third portion 443 of the grip portion groove 44) of 0.8 mm or more. do.

Here, as shown in FIG. 2, the pedestal 46 of the main body part 50 and the opening grip part 60 are spaced apart in the vertical direction. As a result, it is possible to suppress the generation of burrs on the lower surface 60 e of the opening grip portion 60 .

That is, when the pedestal 46 of the main body 50 and the opening gripping portion 60 are in contact with each other in the vertical direction, the injected resin forming the unplugging gripping portion 60 is injected onto the pedestal 46 . On the other hand, the body portion 50 having the pedestal 46 is made of a synthetic resin material as will be described later. For this reason, when forming the plug-opening grip part 60 with injected resin, for example, the pedestal 46 is deformed by injection pressure, heat, or the like, and an unintended gap is formed between the pedestal 46 and the mold. there is a possibility. In this case, the injected resin forming the opening grip portion 60 may enter the gap, and burrs covering the outer surface 46 a of the base 46 may be generated in the opening grip portion 60 .

On the other hand, in the present embodiment, the pedestal 46 of the main body part 50 and the opening grip part 60 are spaced apart in the vertical direction. In this case, as will be described later, the injected resin forming the opening grip portion 60 is not placed on the pedestal 46, but on the mold (specifically, on the slide 83 of the second mold 80B described later, FIG. 8B). reference). That is, the injection resin forming the opening grip portion 60 is received by the mold. Therefore, even if an unintended gap is formed between the pedestal 46 and the mold, the injected resin forming the opening gripping portion 60 is received by the mold, so that the injected resin is released. It is possible to suppress entry into the gap. Therefore, it is possible to suppress the occurrence of burrs covering the outer surface 46 a of the base 46 on the opening grip portion 60 .

In this case, it is preferable that the opening grip part 60 is spaced apart from the pedestal 46 over the entire circumference of the cylindrical body 40 . As a result, burrs that cover the outer surface 46a of the base 46 can be suppressed over the entire circumference of the cap-opening grasping portion 60 .

Moreover, the distance L4 between the upper surface 46b of the base 46 and the lower surface 60e of the opening grip portion 60 is preferably 0.3 mm or more and 3.0 mm or less. Since the distance L4 is 0.3 mm or more, when the cap 20 is manufactured, the projecting portion of the slide 83, which will be described later, is arranged between the upper surface 46b of the pedestal 46 and the lower surface 60e of the opening grip portion 60. The thickness (vertical distance) of 83b is 0.3 mm or more. Therefore, the durability of the projecting portion 83b is improved. In addition, since the distance L4 is 3.0 mm or less, it is possible to prevent the design of the cap 20 from deteriorating.

Furthermore, in the vertical cross section, the outer surface 60f of the opening gripping portion 60 is preferably positioned radially inwardly of the outer surface 46a of the base 46, or positioned on the same plane as the outer surface of the base 46. . This can prevent the user's fingers from contacting the lower surface 60 e of the opening grip 60 when the user lifts the container (not shown). Therefore, it is possible to prevent unintended force from being applied to the grip part 60 for unplugging, and it is possible to prevent the grip part 60 for unplugging from being peeled off from the main body part 50 . .

(Opening assistance part)
Next, the opening assistance part 61 will be described. As described above, the opening assisting portion 61 is provided in the small diameter portion 41 of the cylindrical body 40 of the main body portion 50 . As described above, the small diameter portion 41 is arranged in the substantially upper half region of the tubular body 40 . Therefore, each of the opening assisting portions 61 provided in the small diameter portion 41 is arranged in the substantially upper half region of the cap 20 . Since the small diameter portion 41 is provided with the opening assisting portion 61 in this way, when the user opens the cap 20 , the finger of the user comes into contact with the opening assisting portion 61 . As a result, it is possible to further improve the user's finger grip on the cap 20 .

Further, as shown in FIG. 3, in the present embodiment, the small-diameter portion 41 is provided with three opening assisting portions 61 . The unplugging assisting portions 61 are provided at positions corresponding to the above-described assisting grooves 43, and the respective unplugging assisting portions 61 are arranged so as to be equidistantly distributed by about 120° in plan view. there is In addition, as shown in FIGS. 1 and 2, the opening assisting portion 61 spreads along the vertical direction and the circumferential direction. Upper ends of the plurality of opening assisting portions 61 are connected to corresponding radial portions 62 provided on the top plate 30 . Further, the lower ends of the plurality of unplugging assisting portions 61 are connected to the corresponding unplugging grasping portions 60, respectively, as described above. As will be described later, the unplugging assisting portion 61 is provided by injection resin that passes through the assisting portion groove 43 when forming the unplugging gripping portion 60 .

(Radial part)
Next, the radial portion 62 will be described. As described above, the radial portion 62 is provided on the top plate 30 of the body portion 50 . As shown in FIGS. 1 to 3, the top plate 30 is provided with three radial portions 62 in this embodiment. The radial portions 62 are provided at positions corresponding to the radial portion grooves 31 described above, and each have a substantially sector shape. Each radial portion 62 is arranged so as to be evenly distributed about 120° in 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. As shown in FIG. Moreover, as described above, the plurality of radial portions 62 are connected to the corresponding opening assisting portions 61 respectively. As will be described later, the radial portion 62 is provided by injection resin that passes through the radial portion groove 31 when forming the cap-opening grip portion 60 . In addition, in the illustrated example, each radial portion 62 has a substantially fan shape, but the present invention is not limited to this. For example, although not shown, each radial portion 62 may have a substantially rectangular shape. Moreover, although the three radial portions 62 are connected to each other at the central portion 62c, the present invention is not limited to this. 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 FIGS. 2, 6A and 6B, the pilfer proof band 70 is connected to the lower end of the tubular body 40 via a plurality of bridges 71 coupled to the pedestal 46 . At least one of the plurality of bridges 71 is breakable. The pilfer proof band 70 also has a plurality of ring divisions 70a divided in the circumferential direction. In this case, ring segments 70a adjacent to each other in the circumferential direction are connected to each other by breakable connecting members 72 .

By checking whether the bridge 71 is ruptured or whether the connecting member 72 is ruptured, the cap 20 can be secured by checking whether the bridge 71 is broken or not because the cap 20 is provided with the Pilfer proof band 70 described above. It is possible to determine whether unauthorized opening of the package has occurred.

A plurality of seat portions 73 are formed on the upper end of the pilfer proof band 70 so as to overlap the polygonal first projections 60c of the opening grip portion 60 of the cap 20 in the circumferential direction. As a result, deformation of the pilfer proof band 70 can be suppressed when the cap 20 is released from the second mold 80B described later by the cylindrical dispensing part 84 described later, and the cap 20 can be smoothly released. can be modeled.

By the way, of the cap 20 described above, the body portion 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. As a material in this case, for example, PP (polypropylene), PE (polyethylene), or the like can be used.

Further, the above-described unplugging grip portion 60, the unplugging assisting portion 61, and the radial portion 62 may contain an elastomer resin. By including the elastomer resin in the opening gripping portion 60, the opening assisting portion 61, and the radial portion 62, the anti-slip function of the cap 20 can be improved. Further, in this case, the unplugging grip portion 60, the unplugging assisting portion 61, and the radial portion 62 may be made of the same material. Since the gripping portion 60 for unplugging, the assisting portion 61 for unplugging, and the radial portion 62 are made of the same material, the gripping portion 60 for unplugging, the assisting portion 61 for unplugging, and the radial portion 62 are easily formed. The productivity of the cap 20 can be improved. In this case, the elastomer resin includes conventionally known thermoplastic elastomers such as styrene-based elastomers, olefin-based elastomers, urethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers. Moreover, one type of these thermoplastic elastomers may be used alone, or two or more types may be used in combination.

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

As shown in FIG. 8A, the first mold 80A includes a first cavity-equipped mold 81A for manufacturing the main body portion 50 of the cap 20 and a first core 82a housed in the first cavity-equipped mold 81A. and a second core 82b, a pair of slides 83, and a cylindrical dispensing part 84. As shown in FIG. Of these, the first cavity mold 81A is formed with projections 31a, 43a, and 44a corresponding to the radial portion groove 31, the auxiliary portion groove 43, and the grip portion groove 44 of the main body portion 50, respectively. .

A gate (injection port) 81a for injecting injection resin is formed at a position corresponding to the center of the top plate 30 of the main body 50 in the first cavity mold 81A. In this case, with the first core 82a and the second core 82b housed in the first cavity mold 81A, the first cavity mold 81A and the first core 82a and the second core 82b The body portion 50 of the cap 20 is manufactured by injecting an injection resin (for example, polypropylene or polyethylene) into the space. Further, the pair of slides 83 are formed with recessed portions 83 a corresponding to the pilfer proof bands 70 .

On the other hand, as shown in FIG. 8B, the second mold 80B includes a second cavity-equipped mold 81B for manufacturing the opening gripping portion 60, the opening assisting portion 61, and the radial portion 62 of the cap 20; It has the above-described first core 82a and second core 82b, the above-described pair of slides 83, and the above-described tubular dispensing part 84, which are accommodated in the two-cavity mold 81B.

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

A gate (injection port) 81b for injecting injection resin is formed at a position corresponding to the center of the top plate 30 of the main body 50 in the second cavity mold 81B. In this case, the manufactured main body portion 50, the manufactured main body portion 50, the first core 82a, and the second core 82b are housed in the second cavity-equipped mold 81B, and the second cavity-equipped mold 81B. By injecting injection resin (e.g., elastomer resin) into the space between 81B, opening gripping portion 60, opening assisting portion 61, and radial portion 62 of cap 20 are formed. . Although not shown, the mold 81B with the second cavity is formed with depressions and projections corresponding to the first projections 60c and the depressions 60b of the opening gripper 60. As shown in FIG.

In addition, projecting portions 83b projecting radially inward are formed at the upper ends of the pair of slides 83, respectively. The protruding portion 83b plays a role of receiving the injected resin that forms the gripping portion 60 for opening.

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

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. .

Next, as shown in FIG. 9A(a), the first core 82a and the second core 82b are accommodated in the first cavity mold 81A, and the pair of slides 83 and the cylindrical dispensing part 84 are placed. Mounting. In this way, as shown in FIG. 9A(b), a mold 81A with a first cavity, a first core 82a, a second core 82b, a pair of slides 83, and a cylindrical dispensing part 84 are assembled. Mold clamped.

Next, as shown in FIG. 9B(a), 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 mold 81A with the first cavity and the first core 82a and the second core 82b. As the injection resin, for example, polypropylene and polyethylene can be used.

The injected injection resin enters between the mold 81A with the first cavity and the pair of slides 83, and the first core 82a and the second core 82b. A proof band 70 is molded. At this time, projections 31a, 43a, and 44a corresponding to the radial portion groove 31, the auxiliary portion groove 43, and the grip portion groove 44 of the main body portion 50 are formed in the first cavity mold 81A. (See Figure 8A). As a result, the radial portion groove 31 , the auxiliary portion groove 43 , and the grip portion groove 44 are formed in the body portion 50 .

Then, as shown in FIG. 9B(b), of the first mold 80A, the mold 81A with the first cavity is removed from the main body portion 50 that has been produced.

Next, a mold 81B with a second cavity for the second mold 80B is prepared. Next, as shown in FIG. 10A(a), a mold 81B with a second cavity is attached to the main body portion 50 thus produced. In this way, as shown in FIG. 10A(b), a mold 81B with a second cavity, a first core 82a, a second core 82b, a pair of slides 83, and a tubular dispensing part 84 are assembled. Mold clamped.

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 mold 81B with the second cavity and the main body portion 50 . As the injection resin, for example, an elastomer resin can be used.

The injected injection resin enters between the second cavity mold 81B and the body portion 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 portion 50 attached to the second core 82b and the second cavity mold 81B. In this case, a gap is formed between the radial portion groove 31, the auxiliary portion groove 43, and the grip portion groove 44 of the body portion 50 attached to the second core 82b, and the second cavity mold 81B. It is Therefore, the injected resin spreads radially on the top plate 30 from the center of the top plate 30 through the radial portion grooves 31 and reaches the auxiliary portion grooves 43 . Then, the injected resin that has reached the auxiliary portion groove 43 reaches the grip portion groove 44 . After that, the injected resin that has reached the gripping groove 44 spreads between the large-diameter portion 42 of the cylindrical body 40 of the main body 50, the mold 81B with the second cavity, and the pair of slides 83, and is used for opening. A gripping portion 60, an opening assisting portion 61 and a radial portion 62 are formed.

Here, the convex portion 10 is formed in the groove 44 for gripping portion of the large diameter portion 42 . As a result, the projection 10 obstructs the flow of the injected resin that has flowed into the region of the groove 44 for gripping portion where the thick portion 66 is formed. 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 injection resin forming the opening gripping portion 60 spreads over the entire gripping portion groove 44 . Therefore, it is possible to suppress the occurrence of a so-called short shot in which the groove for gripping portion 44 is exposed from the gripping portion for opening 60 .

In addition, the injection resin forming the opening grip portion 60 is received by the projecting portion 83b of the slide 83. As shown in FIG. Therefore, when an unintended gap is formed between the annular groove 47 and the slide 83, even if the injected resin forming the opening grip part 60 enters the gap, the burr is formed in an annular shape. It fits inside the groove 47 . Therefore, it is possible to suppress the occurrence of burrs covering the outer surface 46 a of the base 46 on the opening grip portion 60 .

Thus, the cap 20 is obtained within the second mold 80B. Next, as shown in FIG. 10B(b), of the second mold 80B, the mold 81B with the second cavity is removed from the manufactured cap 20. Next, as shown in FIG. At this time, the first core 82a is moved away from the second core 82b, and the pair of slides 83 are slid away from each other.

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

The cap 20 is then ejected by pressing the tubular dispensing part 84 against the cap 20 . Thus, the cap 20 including the body portion 50 and the opening grip portion 60 provided on the outer surface 42a of the cylindrical body 40 of the body portion 50 is obtained.

Here, an unplugging grasping portion 60 is provided on the outer surface 42a of the large diameter portion 42 of the cylindrical body 40 (see FIGS. 1 to 3). As a result, when the user opens the cap 20 , it is possible to improve the ease with which the user's finger can reach the opening grip portion 60 . That is, when the user opens the cap 20 , the user's fingers first move the opening grips 60 adjacent to each other and the cylindrical body 40 exposed between the opening grips 60 . It abuts on the outer surface 42 a of the large diameter portion 42 . Then, when the user rotates the cap 20 in the unplugging direction, the user's fingers are caught on the first projection 60c and the second projection 60d of the gripping portion 60 for opening. In this manner, since the user's fingers are caught on the first projection 60c and the second projection 60d of the unplugging grip portion 60, the user's finger gripping property on the unplugging grip portion 60 can be improved. and the grip of the cap 20 can be improved. Therefore, force in the opening direction can be easily applied to the cap 20, and the cap 20 can be easily opened.

As described above, according to the present embodiment, the cap 20 includes the top plate 30, the tubular body 40 extending downward from the outer peripheral edge 30e of the top plate 30, and the pedestal 46 provided below the tubular body 40. and an opening gripping portion 60 provided on the outer surface 42a of the cylindrical body 40 of the main body portion 50. In addition, the pedestal 46 and the opening handle 60 are spaced apart in the vertical direction. As a result, it is possible to suppress the generation of burrs on the lower surface 60 e of the opening grip portion 60 . That is, the injected resin forming the opening gripping portion 60 is received by the protruding portion 83b of the slide 83 of the second mold 80B. Therefore, when an unintended gap is formed between the annular groove 47 and the slide 83, even if the injected resin forming the opening grip part 60 enters the gap, the burr is formed in an annular shape. It fits inside the groove 47 . Therefore, it is possible to suppress the occurrence of burrs covering the outer surface 46 a of the base 46 on the opening grip portion 60 .

Further, according to the present embodiment, the opening grip portion 60 contains an elastomer resin. Thereby, the anti-slip function of the cap 20 can be improved. Therefore, the cap 20 can be easily opened.

Further, according to the present embodiment, the unplugging grip part 60 is separated from the pedestal 46 over the entire circumference of the tubular body 40 . As a result, burrs that cover the outer surface 46a of the base 46 can be suppressed over the entire circumference of the cap-opening grasping portion 60 .

Furthermore, according to the present embodiment, in the vertical cross section, the outer surface 60f of the opening grip portion 60 is located radially inward of the outer surface 46a of the base 46, or is flush with the outer surface of the base 46. located in This can prevent the user's fingers from contacting the lower surface 60 e of the opening grip 60 when the user lifts the container (not shown). Therefore, it is possible to prevent unintended force from being applied to the grip part 60 for unplugging, and it is possible to prevent the grip part 60 for unplugging from being peeled off from the main body part 50 . .

In addition, in the present embodiment described above, an example in which the pilfer 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, the pilfer proof band 70 may be connected to the tubular body 40 via a single bridge 71 .

Further, in the present embodiment described above, an example has been described in which the pilfer proof band 70 has a plurality of split ring bodies 70a that are split in the circumferential direction, but the present invention is not limited to this. For example, although not shown, it may be composed of a single member.

Further, in the present embodiment described above, an example in which the convex portion 10 protruding radially outward is formed in a portion of the cylindrical body 40 that is covered with the thick portion 66 of the opening grip portion 60. has been described, but it is not limited to this. For example, although not shown, the convex portion 10 may not be formed.

Modifications Next, various modifications of the cap will be described with reference to FIGS. 11A to 16. FIG. 11A to 16 are diagrams showing various modifications of the cap or the body of the cap. In FIGS. 11A to 16, the same parts as those shown in FIGS. 1 to 10C are denoted by the same reference numerals, and detailed description thereof is omitted.

(First modification)
11A and 11B show a cap 20 according to a first variant. In FIGS. 11A and 11B, the large-diameter portion 42 and the opening grip portion 60 of the cap 20 have square outlines in plan view. Further, in this modified example, two each of the unplugging grasping portions 60, the unplugging assisting portions 61, and the radial portions 62 are provided. Furthermore, in this modified example, as shown in FIG. 11C, two each of radial portion grooves 31, auxiliary portion grooves 43, and grip portion grooves 44 are provided. 11A to 11C, the knurls K, the first portions 311, 431, 441, etc. are omitted for clarity.

(Second modification)
Figures 12A and 12B show a cap 20 according to a second variant. 12A and 12B, the thick portion 66 covers the circumferential central portion 440 of the groove for gripping portion 44, and the thin portions 65 are located on both sides of the thick portion 66 in the circumferential direction. 12A and 12B, similarly to the first modified example, the large-diameter portion 42 and the opening grip portion 60 of the cap 20 have square outlines in plan view. In addition, in this modification, each of the opening gripping portions 60, the opening assisting portions 61, and the radial portions 62 is provided four each. Furthermore, in this modification, as shown in FIG. 12C, each of the radial portion grooves 31, the auxiliary portion grooves 43, and the grip portion grooves 44 is provided four each. 12A to 12C, the knurls K, the first portions 311, 431, 441, etc. are omitted for clarity.

(Third modification)
Figures 13A and 13B show a cap 20 according to a third variant. 13A and 13B, similarly to the second modification, the thick portion 66 covers the circumferential center portion 440 of the groove for gripping portion 44, and the thin portion 65 covers both sides of the thick portion 66 in the circumferential direction. located in 13A and 13B, the large-diameter portion 42 and the opening grip portion 60 of the cap 20 have triangular contours in plan view. Further, in this modified example, three each of the unplugging grasping portions 60, the unplugging assisting portions 61, and the radial portions 62 are provided. Furthermore, in this modification, as shown in FIG. 13C, each of the radial portion grooves 31, the auxiliary portion grooves 43, and the grip portion grooves 44 is provided three each. 13A to 13C, the knurls K, the first portions 311, 431, 441, etc. are omitted for clarity.

(Fourth modification)
Figures 14A and 14B show a cap 20 according to a fourth variant. 14A and 14B, similarly to the second modification, the thick portion 66 covers the circumferential center portion 440 of the groove for gripping portion 44, and the thin portion 65 covers both sides of the thick portion 66 in the circumferential direction. located in 14A and 14B, the large-diameter portion 42 and the opening grip portion 60 of the cap 20 have hexagonal contours in plan view. Further, in this modified example, six each of the opening gripping portions 60, the opening assisting portions 61, and the radial portions 62 are provided. Furthermore, in this modification, as shown in FIG. 14C, each of the radial portion grooves 31, the auxiliary portion grooves 43, and the grip portion grooves 44 is provided six each. 14A to 14C, the knurls K, the first portions 311, 431, 441, etc. are omitted for clarity.

(Fifth modification)
15 and 16 show the body portion 50 of the cap 20 according to the fifth modification. In FIG. 15, the convex portion 10 is formed in a trapezoidal shape when viewed from the front. A tapered portion 12 is formed around the convex portion 10 . As shown in FIG. 16, the tapered portion 12 is formed so that the thickness thereof gradually decreases as the distance from the convex portion 10 increases. This prevents the projection 10 from excessively obstructing the flow of the injected resin. Therefore, the injection resin forming the gripping portion 60 for opening can be easily spread over the entire gripping portion groove 44 .

Also in the above-described first to fifth modifications, it is possible to suppress the formation of burrs on the lower surface 60e of the opening grip portion 60. As shown in FIG. In addition, the injection resin forming the opening grip portion 60 can be easily distributed throughout the grip portion groove 44, and the grip portion groove 44 is exposed from the unplugging grip portion 60, which is a so-called short circuit. It is possible to suppress the occurrence of shots.

It is also possible to appropriately combine a plurality of constituent elements disclosed in the above embodiments and modifications as necessary. Alternatively, some constituent elements may be deleted from all the constituent elements shown in the above embodiments and modifications.

20 Cap 30 Top Plate 30e Peripheral Edge 40 Cylindrical Body 46 Pedestal 46a Outer Surface 46b Upper Surface 50 Body Part 60 Grip for Opening 60e Lower Surface 60f Outer Surface 70 Pilfer Proof Band

Claims (6)

a body portion having a top plate, a tubular body extending downward from the outer peripheral edge of the top plate, and a pedestal provided below the tubular body;
a plug-opening grip provided on the outer surface of the cylindrical body of the main body,
The cap, wherein the pedestal and the opening gripping portion are spaced apart in a vertical direction. 2. The cap according to claim 1, wherein said opening handle includes an elastomer resin. 3. The cap according to claim 1 or 2, wherein said opening gripper is spaced apart from said pedestal over the entire circumference of said cylindrical body. 4. The cap according to any one of claims 1 to 3, wherein the distance between the upper surface of said base and the lower surface of said opening grip is 0.3 mm or more and 3.0 mm or less. 5. Any one of claims 1 to 4, wherein, in a vertical cross section, an outer surface of said opening gripper is located radially inwardly of, or flush with, an outer surface of said base. 1. The cap according to item 1. 6. The cap of any one of claims 1-5, further comprising a pilfer proof band connected to the tubular body.

Images