JP3938958B2 - Resin cap - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a cap excellent in sealing reliability and unsealing property, and more specifically, it can form a reliable seal and can be easily and surely opened, and also has tamper evidence (TE). Related to the cap.
[0002]
[Prior art]
Resin caps can be integrally molded, and have excellent moldability and flexibility, so they can be fixed to the container mouth by a stoppering operation and have been widely used in various forms. ing.
[0003]
Various types of resin caps that have excellent sealing properties and that can be easily removed from the container mouth without using a tool have been proposed. For example, Japanese Patent Publication No. 51-10555 Has a discontinuous ring-shaped protrusion that fits into the neck of the container and engages with the container, and has both ends firmly joined to the peripheral wall of the lid. A tamper-proof lid made of a synthetic resin integrally formed with a handle that is bent with a connecting piece that is easy to cut between the inner peripheral surface and the peripheral wall of the lid body, while bending a large portion of the inner peripheral surface and a peripheral wall of the lid body. Is described.
[0004]
Japanese Laid-Open Patent Publication No. 8-244802 according to the proposal of the present inventors discloses a cap body comprising a top plate portion and a skirt portion, and a protrusion engaging with a container mouth portion on the inner surface of the skirt portion, and the cap In the resin cap comprising a ring-shaped side wall integrally provided on the cap body so as to cover the outer surface of the skirt portion of the main body, the skirt portion of the cap body has a plurality of weakening portions (slits) extending in the axial direction. The cap main body and the outer ring group upper side wall are integrally formed through a connecting portion and a plurality of breakable bridging portions, and the cap main body skirt outer surface and the ring-shaped side wall inner surface are completely separated. The cap body skirt part outer surface and the ring-shaped side wall inner surface are cut after injection or compression molding. Put, it has also been described and is formed by separating the portion excluding the bridge or further connecting portions.
[0005]
[Problems to be solved by the invention]
The former prior art is significant as providing a plastic cap that can be opened by hand and does not require special tools such as a bottle opener, and also has an anti-fraud function. At the base part, the protrusion is not engaged with the container neck, so there is still a problem in sealing reliability, and conversely, the protrusion and container neck are kept to the extent that the sealing reliability is maintained. When the degree of engagement is increased, the opening force becomes excessively large, which causes a problem that opening is difficult.
[0006]
The latter prior art prevents the ring-shaped side wall from spreading out from the weakened part or the skirt part provided with the slit when the cap is plugged and sealed, thereby enabling reliable sealing and opening. Sometimes, the removal of the ring-shaped side wall achieves the advantage of allowing the skirt to spread outward and allowing the cap to be removed.
[0007]
However, in the production of this double-walled cap, it is necessary to manufacture the skirt portion and the ring-shaped side wall integrally by injection molding or compression molding, and to form a cut by a cutter or the like in the cap after molding, The number of processes is large, and it is still not fully satisfactory in that a cutting device is newly required.
[0008]
In addition, a gap is formed upward between the skirt portion and the ring-shaped side wall, and dust, water, etc. are likely to enter the gap. Since it penetrates into the gap and it is difficult to remove it, the presence of the cut is not desirable from the standpoint of cleanliness and hygiene.
[0009]
Accordingly, an object of the present invention is to form the skirt portion and the ring-shaped member on the outer periphery thereof so as to be separable at the time of opening without forming a cut, and at the time of plugging, a sealing structure with a sealing reliability is formed. In addition, it is an object of the present invention to provide a plastic cap that can be opened easily without using any special instrument for opening, and that has tamper evidence.
[0010]
Another object of the present invention is to facilitate the production with a small number of steps and to prevent the generation of gaps between the skirt portion and the ring-shaped member that may cause intrusion of dust and water. The member protects the cap body skirt part, and the ring-shaped member is removed when the cap is opened, so that the skirt part can be easily detached from the container mouth part, and the ring-shaped member has tamper-evident plasticity. In providing caps.
[0011]
[Means for Solving the Problems]
According to the present invention, a cap main body provided with a skirt portion and a receptacle seat for a container mouth inside the skirt portion, and a continuous body integrally provided on the cap main body so as to cover the outer surface of the skirt portion of the cap main body. In the resin cap made of a ring-shaped member, the cap body and the ring-shaped member are integrally formed of different types of resins, and are engaged with the outer peripheral portion of the container mouth portion on the inner surface side of the skirt portion of the cap body. A plurality of notches extending in the axial direction from the lower end in the axial direction at least beyond the protrusion, and spaced apart in the circumferential direction. The ring-shaped member and the ring-shaped member are bonded to each other on the back side corresponding to the protruding portion via a bonding surface that can be peeled over at least most of the circumference. And also resin cap, characterized in that it enables removal from the container mouth portion of the cap body after removal of the part is provided.
[0012]
In the present invention, it is preferable that the two different types of resins are resins having a seal strength of 1.5 kg / 15 mm width or less.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The plastic cap of the present invention comprises a cap main body skirt portion and a ring-shaped member provided so as to cover the outer surface of the skirt portion, and the inner surface side of the lower portion of the skirt portion of the cap main body is connected to the outer peripheral portion of the container mouth portion. The cap body and the ring-shaped member are provided with a plurality of notches extending in the axial direction extending from the lower end to the lower part of the skirt part and extending in the circumferential direction at the lower part of the skirt part. Are integrally formed of different types of resins, and the lower part of the skirt part of the cap body and the ring-shaped member are separated from each other on the back side corresponding to the protruding part through a joint surface that can be peeled over at least most of the circumference. The cap body can be detached from the container mouth after the at least part of the ring-shaped member is removed.
[0014]
In this type of cap, since a protrusion projecting radially inward is formed on the inner surface side of the lower part of the skirt portion of the cap body, this protrusion engages with the outer periphery of the container mouth to form a seal. This sealed state is maintained as long as the ring-shaped member exists on the outer periphery of the skirt portion.
[0015]
In addition, since a plurality of cutouts extending in the axial direction extending from the lower end to beyond the protruding portion are provided at the lower portion of the skirt portion at intervals in the circumferential direction, when the ring-shaped member is removed from the outer periphery of the skirt portion, The lower part of the skirt part can be expanded outward in the radial direction, and the cap body can be detached from the container mouth part.
[0016]
In the present invention, since the cap body and the ring-shaped member are integrally formed of different types of resins, a gap is formed between the skirt portion and the ring-shaped member until a peeling force is applied between the two members. When a peeling force is applied between the two members, the skirt part and the ring-shaped member are separated by a peelable joint surface between the two members, and the ring-shaped member is separated from the skirt. It becomes possible to remove from the outer periphery of the part.
[0017]
This eliminates the need for troublesome and troublesome operations such as forming a cut between the skirt portion and the ring-shaped member on the outer periphery of the skirt portion, and allows the cap to be manufactured with a small number of steps. Generation of gaps that may cause intrusion of dust, water, etc. can be prevented between the ring and the ring-shaped member, and a sealing structure with a reliable sealing can be formed. In addition, the cap can be easily opened and tamper evidence can be imparted to the cap. Further, the ring-shaped member protects the cap main body skirt portion when the stopper is plugged, and the ring-shaped member is removed when the cap is opened, so that the skirt portion can be easily detached from the container mouth portion.
[0018]
First, the skirt part and the ring-shaped member are joined at a peelable interface, so that the cap body skirt part is hooked by the ring-shaped member at least in the stoppered state, preventing the skirt part from spreading outward. Thus, reliable sealing performance with respect to the container mouth is maintained. This is particularly important in the case of the cap of the present invention in which the skirt is provided with a cutout extending in the axial direction. In other words, the cutout of the skirt portion acts to weaken the engagement state between the container mouth portion and the protrusion of the skirt portion, and the engagement state is strengthened by the action of the tagging force by the ring-shaped member. And it can be made sure.
[0019]
Next, at the time of opening, the ring-shaped member is pushed up or down to cause adhesive failure at the peelable interface between the skirt portion and the ring-shaped member, and the ring-shaped member is removed from the outer periphery of the lower portion of the skirt portion. The lower part of the skirt is provided with a notch that extends in the axial direction from the lower end beyond the protrusion, so that when the cap body is pulled upward, the protrusion on the inner surface of the skirt is removed from the outer periphery of the container mouth. It becomes possible to spread in the radially outward direction, and the entire cap can be removed from the container mouth.
[0020]
In the present invention, the cap is not only reliably opened as described above, but the ring-shaped member is not completely restored to the original state after the opening or the ring-shaped member is removed. As a result, the fact that opening has been performed becomes clear, and tamper evidence is imparted. In addition, since the entire cap is removed from the container opening, it is possible to separate and collect the container and the cap.
[0021]
In the present invention, the cap main body and the ring-shaped member are formed of two different types of resins, but these two different types of resins have a seal strength of 1.5 kg / 15 mm width or less when melt-bonded. It is preferable that the resin is. If this seal strength exceeds the above range, it tends to be difficult to remove the ring-shaped member by hand when the cap is opened.
[0022]
The resin may be any thermoplastic resin that can be injection-molded. For example, low-density polyethylene, linear low-density polyethylene (LLDPE), high-density polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1 -Polyolefins such as pentene or ethylene, pyropyrene, 1-butene, 4-methyl-1-pentene and other random or block copolymers, ethylene / vinyl acetate copolymers, ethylene / vinyl alcohol copolymers , Ethylene / vinyl compound copolymer such as ethylene / vinyl chloride copolymer, polystyrene, styrene resin such as acrylonitrile / styrene copolymer, ABS, α-methylstyrene / styrene copolymer, polyvinyl chloride, polychlorinated Vinylidene, vinyl chloride / vinylidene chloride copolymer, poly Polyvinyl compounds such as methyl reacrylate and polymethyl methacrylate, polyamides such as nylon 6, nylon 6-6, nylon 6-10, nylon 11 and nylon 12, thermoplastic polyesters such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate, poly Phenylene oxide or the like or a mixture thereof can be used, and a combination having no compatibility and low sealing strength is selected from these.
[0023]
An example of a combination of different types of resins is not limited to this, but one of the cap body and the ring-shaped member is composed of high-density polyethylene or a propylene-based polymer, and the other is low-density polyethylene, linear low-density polyethylene, or It is preferable to be composed of an ethylene-based copolymer in terms of the combination of the sealing performance of the cap and the ease of removal of the ring-shaped member.
[0024]
As the crystalline propylene polymer, in addition to homopolypropylene, a random or block copolymer containing 1 to 20% by weight, particularly 2 to 15% by weight of ethylene is used. These polypropylenes may have an isotactic structure or a syndiotactic structure.
[0025]
Examples of the ethylene polymer include high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene and other olefins such as propylene and butene-1. , Pentene-1, hexene-1, 4-methylpentene-1, octene-1, decene-1, etc. at least one copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, ionomer, etc. Is mentioned.
[0026]
In particular, it is desirable that one of the cap body and the ring-shaped member is made of a propylene polymer and the other is made of high-low density polyethylene.
[0027]
In the composite plastic cap of the present invention, a compatibilizer is blended in at least one of the resins in order to adjust the degree of adhesion at a plurality of resin interfaces to such an extent that accidental loss can be prevented, although it is not generally required. Can do. The compatibilizing agent is to enhance the interaction between different types of polymers, and is a block copolymer or graft copolymer having the same components as the polymers A and B to be used; A block copolymer or a graft copolymer having a third component mixed in a state; a graft copolymer of two types of polymers that are compatible only with one of the polymers A and B to be blended; and the like.
[0028]
Focusing on the function of the compatibilizer, there are two types, a non-reactive compatibilizer and a reactive compatibilizer. Examples of the former include styrene-ethylene-butadiene block copolymer, polyethylene-poly There are methyl methacrylate block copolymer, polyethylene-polystyrene block copolymer, etc., and examples of the latter include maleic anhydride-modified olefin resin, particularly maleic anhydride grafted polypropylene and polyethylene, styrene-maleic anhydride copolymer, Examples thereof include an ethylene-glycidyl methacrylate copolymer, an ethylene-acrylic acid ester-maleic anhydride copolymer, and a styrene-glycidyl methacrylate copolymer.
[0029]
These compatibilizers can be present in the resin in an amount of 0.5 to 20% by weight, in particular 2 to 10% by weight.
[0030]
In the cap of the present invention, in order to integrally mold the cap body and the ring-shaped member with different types of resins, a molding means known per se, for example, two-color injection molding or insert molding can be used.
[0031]
In the cap of the present invention, the lower part of the skirt portion of the cap body and the ring-shaped member are peeled at a height of at least 0.5 mm, preferably 1.0 to 3.0 mm on the back side of the protrusion. It is desirable to be adhesively bonded. If the width of the peelable adhesive is smaller than the above range, the ring-shaped member is likely to be accidentally dropped.
[0032]
The peelable adhesive surface is generally (1) located on a cylindrical surface, but (2) the peelable adhesive surface is a ring-shaped member having a smaller inner diameter and an outer diameter downward. May be located on a tapered surface formed between the outer peripheral portion of the skirt portion with a smaller diameter, or conversely (3) the peelable adhesive surface has a ring-shaped member with a smaller inner diameter upward, You may be located on the taper surface formed between the outer peripheral part of the skirt part where an outer diameter becomes small. In the case of (1) above, the removal direction of the ring-shaped member is not particularly limited, but in the case of (2) above, the ring-shaped member is pushed downward, and in the case of (3) above. The ring-shaped member can be easily removed by pushing the ring-shaped member upward.
[0033]
In one preferred embodiment of the present invention, the peelable adhesive surface is located on the cylindrical surface, and the outer surface of the skirt portion and the inner surface of the ring-shaped member are provided on one side and on the other side. The ring-shaped member is prevented from accidental dropping by engaging with the minute recess.
[0034]
In the present invention, it is possible to form a push-down or push-up tab protruding in the radially outward direction on a part of the ring-shaped member, thereby easily removing the ring-shaped member and starting the removal. The position of can be specified.
[0035]
In addition, the ring-shaped member can be peel-bonded over the entire circumference of the lower part of the skirt, and the ring-shaped member can be locked to the cap body on the opposite side of the tab so as not to be peeled and can be peeled off at other portions. It can also be glued. In the latter case, the used cap main body and the ring-shaped member can be disposed of in an integrated manner, which is convenient.
[0036]
Furthermore, a weakening portion or a tear start portion extending in the height direction may be provided on a part of the periphery of the ring-shaped member, and a tear tab may be provided in the vicinity of the weakening portion or the tear start portion. The peel strength at the peelable adhesive surface is large for the shear stress parallel to the adhesive surface and is relatively small for the peeling force perpendicular to the adhesive surface. According to the aspect, even when the strength of the peelable adhesive surface is quite high, it is possible to peel the adhesive member in the direction perpendicular to the adhesive surface, and the ring-shaped member can be easily detached.
[0037]
In the present invention, the notch portion provided in the lower part of the skirt portion of the cap body can be formed with a resin-filled protrusion that constitutes a ring-shaped member that fills at least a portion thereof. And the rotation with respect to the skirt part of a ring-shaped member is suppressed, and it is effective in preventing accidental drop-off of a ring-shaped member. In this case, the removal of the ring-shaped member is performed by shifting the ring-shaped member in the axial direction or by the above-described peeling.
[0038]
In the above case, the inner surface of the lower part of the skirt part of the cap main body and the inner surface of the filling protrusion part may be flush with each other, or the inner surface of the lower part of the skirt part may recede in the radially outward direction. In the latter case, it is preferable in terms of operability in the stoppering operation and cap removal.
[0039]
Moreover, the notch part provided in the skirt part lower part of the cap main body may be formed so that a space | interval is wide on the inner surface side and a space | interval is narrow on the outer surface side. In this aspect, removal of the ring-shaped member in the radially outward direction from the skirt portion is suppressed, which is effective for preventing the ring-shaped member from accidentally falling off. In this case, the ring-shaped member is removed by shifting the ring-shaped member in the axial direction.
[0040]
The present invention can be applied to various plastic caps. In one aspect of the present invention, a resin crown having a top surface portion is provided. In this case, an inner ring that engages with the inner peripheral side of the container mouth portion is formed on the top surface portion from the viewpoint of continuous sealing.
[0041]
According to another aspect of the present invention, the cap body includes an inner cylinder portion having a diameter smaller than the diameter of the skirt portion, an outer lid engaging screw portion provided on the outer surface of the inner cylinder portion, and an inner cylinder portion. There is provided a cap with an inside plug provided with a planned opening portion provided inside, a weakening portion that defines the planned opening portion, and a tab for opening provided in the planned opening portion.
[0042]
According to still another aspect of the present invention, the cap main body includes an inner cylinder portion serving as a spout having a diameter smaller than the diameter of the skirt portion, a planned opening portion provided inside the inner cylinder portion, and a planned opening portion. A cap with an inner stopper provided with an opening tab provided in the planned opening portion, and a ring-shaped member connected to the hinge and the hinge via the hinge so as to be openable and closable. A resin cap is provided that includes a lockable outer lid.
[0043]
【Example】
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[Example 1]
The bottom view (FIG. 1) which shows one Example (plastic crown) of the cap of this invention, AA 'sectional drawing (FIG. 2) of FIG. 1, the partial enlarged view (FIG. 3) of AA' cross section, and a lower surface In the partially enlarged view (FIG. 4), the cap of the present invention roughly comprises a cap main body 1 and a ring-shaped member 2 continuous. The cap body 1 includes a top surface portion 3 that is integrally formed of resin and a skirt portion 4 that hangs down from the outer periphery thereof.
[0044]
As best shown in FIG. 2, a protrusion 5 is formed on the inner periphery of the skirt portion 4 to engage with a recess (not shown) on the outer peripheral side of the container mouth (not shown). The mouth portion is brought into close contact with the bin mouth receiving seat 8 of the top surface portion 3 so as to be sealed. Further, in this specific example, the top surface portion 3 is formed with an inner ring 6 that engages with the inner peripheral side of the container mouth portion, and is sealed on the inner peripheral side of the container mouth portion. In addition, in order to seal the container mouth portion, a soft resin may be provided on the inner surface of the top surface portion corresponding to the container mouth portion by compression, injection or the like, or a separately formed sheet-like packing may be inserted. May be provided.
[0045]
The ring-shaped member 2 is formed of a resin separate from the cap body 1 and is provided so as to cover at least the lower part of the outer surface of the skirt portion 4 in the form of a continuous ring. The skirt portion 4 of the cap body 1 covered with the ring-shaped member 2 is provided with a plurality of notches 7 extending in the axial direction from the lower end 9 through the protrusion 5 to the upper end 10 at intervals in the circumferential direction. The lower part 4 a of the skirt part 4 is a large number of pieces separated by the notches 7. The skirt portion 4 and the ring-shaped member 2 of the cap body 1 are integrated via a cylindrical surface-like peelable adhesive surface 11.
[0046]
Further, a part of the ring-shaped member 2 is formed with an opening tab 12 projecting outward in the radial direction, and when opening the cap, the ring-shaped member 2 can be pushed up or down by grasping this tab. Yes. As shown in FIG. 4, a rib 13 extending in the radial direction is formed on the opening tab 13 to reinforce the opening tab 12 and clearly indicate the position thereof.
[0047]
A plurality of cutouts 7 extending in the axial direction provided in the skirt portion 4 of the cap body 1 are arranged so that the skirt portion 4 extends radially outward when the cap is opened (when the ring-shaped member 2 is removed). The engagement between the mouth outer periphery concave portion and the skirt portion inward projection 5 is released, and the cap body 1 can be easily detached from the container mouth portion. It is determined appropriately from the viewpoint.
[0048]
In the cap of the present invention, the number of notches 7 provided in the skirt portion 1 varies depending on the diameter of the cap and the like, but generally the pitch between the notches 7 in the circumferential direction is 3 to 20 mm, particularly in the range of 5 to 10 mm. The width of the notch 7 in the circumferential direction is preferably in the range of 0.5 to 3.0 mm, particularly 0.8 to 1.5 mm. Further, the axial dimension of the notch 7 is indispensable to extend past the protrusion 5, and is generally in the range of 0.5 to 10.0 mm, particularly 1.0 to 3.0 mm.
[0049]
The cap body skirt portion 4 is tagged by the ring-shaped member 2 at least in the stoppered state by bringing the skirt portion 4 and the ring-shaped member 2 made of different types of resin into close contact with each other at the part of the peelable adhesive surface 11. Thus, the skirt portion 4 is prevented from spreading outward, and a reliable sealing performance against the container mouth portion is maintained. In the case of the cap of the present invention in which the skirt portion 4 is provided with a notch 7 extending in the axial direction, this close state is particularly important. That is, the notch 7 of the skirt portion 4 acts to weaken the engagement state between the concave portion on the outer periphery of the container mouth portion and the projection portion 5 of the skirt portion 4, but the tagging force by the ring-shaped member 2 acts. Thus, the engaged state can be made strong and reliable.
[0050]
The cap of the present invention can be produced by a molding method known per se called so-called two-color molding (multicolor molding). In the explanatory view (FIG. 5) for explaining the molding principle, this molding apparatus is provided with a primary side injection device 50 and a secondary side injection device 51, and a stationary platen provided with cavity molds 52A and 52B at the tips. 53 and a movable platen 56 having core molds 54A and 54B at the tip and having a mold reversing device 55. The primary side injection device 50 and the cavity mold 52A are connected via a runner 57A, and the secondary side injection device 51 and the cavity mold 52B are connected via a runner 57B. The cavity mold 52A is for molding the cap body 1, while the cavity mold 52B is for forming the ring-shaped member 2 integrally with the cap body 1.
[0051]
In FIG. 5A for explaining the first step (injection), the mold 52A and the mold 54A are clamped, and the first resin is injected from the primary-side injection device 50 into the mold. As a result, the cap body is molded. On the other hand, the mold 52B and the mold 54B are clamped with the cap body 1 mounted, and the second resin is injected from the secondary-side injection device 51 into the mold. A ring-shaped member is formed.
[0052]
In FIG. 5B for explaining the second step (mold opening), the submarine gate of the cavity 52A is cut when the mold is opened, and at least one of the platens 55 and 56 is retracted to perform mold opening. The cap body 1 remains held by the core mold 54B, and only the runner portion 58 is protruded, while the product 59 in which the cap body and the ring-shaped member are integrally formed is protruded together with the runner portion.
[0053]
In FIG. 5C for explaining the third step (reversing), the reversing device 55 of the movable platen 56 is driven, and the core mold 54A holding the cap body 1 and the empty core mold 54B are reversed.
[0054]
In FIG. 5D for explaining the fourth step (clamping), the mold 52B and the mold 54A are clamped in a state where the cap body 1 is mounted, and the mold 52A and the mold 54B are molds. After that, the first and subsequent steps are repeated.
[0055]
An insert molding method can be used instead of the above two-color molding method. In this case, the cap body is molded in advance by injection molding or the like, and the molded cap body is inserted into a mold to form a ring-shaped member. What is necessary is just to shape | mold around the cap main body skirt part.
[0056]
According to the above two-color molding method or insert molding method, a resin different from the resin constituting the cap body is injected around the skirt portion 4 of the cap body 1, and a molten resin is injected. While being closely attached to the skirt portion 4 under the pressure, the ring-shaped member 2 is itself molded. According to the present invention, since the ring-shaped member 2 is fused to the skirt portion 4 under pressure, a gap that causes intrusion of dust or water is generated between the skirt portion and the ring-shaped member. Can be prevented, and a sealing structure with sealing reliability can be formed.
[0057]
Returning to FIGS. 1 to 4 again, at the time of opening, the opening tab 12 is pushed down or pushed up so that the peeling progresses at the peelable adhesive interface 11 between the skirt portion 4 and the ring-like member 2, while the ring-like member 2. Is removed from the skirt 4. As a result, the lower piece 4a of the skirt portion 4 divided by the notch 7 can expand radially outward, and the engagement between the protrusion 5 and the outer peripheral portion of the container is released by pulling up the cap body 1. Then, the cap body 1 is removed from the container mouth. Although the ring-shaped member 2 and the skirt portion 4 are fused at the interface 11, since both resins are not compatible or poorly compatible, the separation between the two easily proceeds.
[0058]
[Example 2]
The bottom view (FIG. 6) which shows the other Example (plastic crown) of the cap of this invention, AA 'sectional drawing (FIG. 7) of FIG. 6, the partial expanded view (FIG. 8) of AA' cross section, and In the partially enlarged view of the lower surface (FIG. 9), the cap of the second embodiment is roughly the same as the cap of the first embodiment, and the common parts are indicated by common reference numerals. The outer periphery of the lower portion 4a of the skirt portion of the cap body 1 has a tapered shape in which the outer diameter decreases downward, the inner periphery of the ring-shaped member 2 has a tapered shape in which the inner diameter decreases downward, and both peelable adhesive surfaces 11a are tapered. It is characterized by the shape.
[0059]
In this type of cap, not only the component force in the vertical direction but also the component force in the horizontal direction acts on the taper-like peelable adhesive surface 11a at the time of peeling. There is an advantage that the ring-shaped member 2 can be peeled off more easily than the cap 1.
Moreover, since the skirt part lower part 4a and the ring-shaped member 2 mesh with each other in the direction of plugging (downward), there is also an advantage that the protrusion 5 can be reliably engaged with the outer periphery of the container mouth during plugging.
Further, when the ring-shaped member 2 is removed by pushing up the opening tab 12, even if some resistance is required for peeling off the ring-shaped member 2, it becomes more difficult to return to the original state after opening, and the opening is performed. The facts that have been revealed are further clarified, and the tamper evidence is further improved.
[0060]
[Example 3]
The bottom view (FIG. 10) which shows further another Example (plastic crown) of the cap of this invention, AA 'sectional drawing (FIG. 11) of FIG. 10, The elements on larger scale of AA' section (FIG. 12) In the partial enlarged view of the lower surface (FIG. 13), the cap of Example 3 is roughly the same as the cap of Example 1, and the common parts are indicated by common reference numerals. The outer periphery of the lower portion 4a of the skirt portion of the cap body 1 is tapered to increase the outer diameter downward, the inner periphery of the ring-shaped member 2 is tapered to increase the inner diameter downward, and both peelable adhesive surfaces 11b are tapered. It is characterized by the shape.
[0061]
In this type of cap, not only vertical component force but also horizontal component force acts on the taper-like peelable adhesive surface 11b at the time of peeling. There is an advantage that the ring-shaped member 2 can be peeled off more easily than the cap 1.
[0062]
[Example 4]
The bottom view (FIG. 14) which shows another Example (plastic crown) of the cap of this invention, AA 'sectional drawing (FIG. 15) of FIG. 14, the partial expanded view (FIG. 16) of AA' section, In the partially enlarged view of the lower surface (FIG. 17), the cap of this Example 4 is roughly the same as the cap of Example 1, and the common parts are indicated by common reference numerals, A feature is that a ring-shaped member forming resin filling projection 15 is provided at a portion corresponding to the notch groove 7 of the skirt portion of the cap body 1 of the first embodiment.
[0063]
More specifically, as shown in FIG. 15, the lower portion 4 a of the skirt portion 4 has a small-diameter portion 17 whose outer diameter is smaller than that of the upper portion via the step portion 16. Further, in the cap of Example 1, the upper end 10 of the notch 7 was flat, but in the cap of Example 5, as shown best in FIG. 18 and a high inner peripheral portion 19 are formed through a stepped portion 20. It is natural that the filling protrusion 15 is integrated with the ring-shaped member 2, but the protrusion 15 meshes with and is in close contact with the stepped portion 16 and the small diameter portion 17 of the skirt portion 4. The outer peripheral portion 18, the inner peripheral portion 19, and the stepped portion 20 are also meshed with and closely attached to each other. In this example, it should be understood that the circumferential width of the protrusion 18 and thus the circumferential width of the notch is constant in the radial direction. It will be understood from the drawing that the inner peripheral surface and the lower end surface of the filling protrusion 15 are in the same surface position as that of the skirt portion lower portion 4a.
[0064]
The cap of this example has a significant hygiene advantage over the cap of Example 1. In the cap of Example 1, the notch 7 is exposed outside the cap, and the container neck communicates with the outside through the notch 7. For this reason, it cannot be avoided that dust and moisture in the outside air adhere to the neck of the container. Of course, even if dirt or moisture adheres to the neck of the container, the sanitary characteristics of the contents are not impaired, but consumers who like cleanliness may dislike it. In the cap of the present embodiment, the notch is closed by the projection 15, so that the container neck can be prevented from being soiled.
[0065]
In the specific example shown in the drawing, all of the notches in the skirt portion lower portion 4a of the cap body 1 are filled with the constituent resin of the ring-shaped member 2, but the notch 7 in FIG. 1 is prevented from being exposed to the outside. For this purpose, it is understood that the constituent resin of the ring-shaped member 2 may be partially filled from the upper surface 10 of the notch 7 to the upper surface of the ring-shaped member 2 or a lower portion than the upper surface. It should be.
[0066]
In addition, in the cap of this example, the above-described meshing prevents the ring-shaped member 2 from spreading outward in the radial direction and prevents the ring-shaped member 2 from shifting upward, so that the containers after plugging can be Even if they collide with each other, the ring-shaped member 2 is not displaced, and the sealing performance is stably maintained. In this type of cap, the ring-shaped member 2 can be easily pulled down by pushing down the opening tab 12.
[0067]
[Example 5]
The bottom view (FIG. 18) which shows another Example (plastic crown) of the cap of this invention, AA 'cross section of FIG. 18 (FIG. 19), The elements on larger scale of AA' cross section (FIG. 20) And in the partially enlarged view of the lower surface (FIG. 21), the cap of the present invention is roughly the same as the cap of Example 4, and the common parts are indicated by common reference numerals. It is a feature that the ring-shaped member forming resin filling protrusions 15a of Example 4 are provided in the form of tenons (wedges).
[0068]
In the cap of this embodiment, the tenon-like protrusion 15a meshes with the tenon-like notch of the skirt portion lower part 4a, and the ring-like member 2 is more effectively prevented from spreading in the radially outward direction.
[0069]
[Example 6]
The bottom view (FIG. 22) which shows the other Example (plastic crown) of the cap of this invention, AA 'sectional drawing (FIG. 23) of FIG. 22, the partial expanded view (FIG. 24) of AA' section, In the partially enlarged view of the lower surface (FIG. 25), this cap is roughly the same as the cap of the first embodiment, and the common portion is indicated by a common reference numeral, but the ring-shaped member 2 On the other hand, a projecting portion 22 extending in the center direction of the diameter is formed in the lower portion on the opposite side of the tab 12, and this projecting portion 22 is bonded to the lower end surface of the skirt portion lower portion 4a via the adhesive interface 21. Is a feature.
[0070]
This type of cap has the advantage that the container mouth of the cap can be removed in one motion. That is, when the tab 12 is pushed up and most of the ring-shaped member 2 is peeled off from the skirt portion lower portion 4a, when the ring-shaped member 2 is further lifted upward, the protruding portion 22 serves as a fulcrum, and the skirt portion lower portion 4a While expanding in the direction, the protrusion 5 is disengaged from the outer periphery of the container mouth, and the cap body 1 together with the ring-shaped member 2 is removed from the container mouth. Thus, the cap of this example is excellent in opening performance.
[0071]
[Example 7]
The bottom view (FIG. 26) which shows other Example (plastic crown) of the cap of this invention, AA 'sectional drawing (FIG. 27) of FIG. 26, The elements on larger scale of AA' section (FIG. 28) In addition, in the partial enlarged view of the lower surface (FIG. 29), the cap of the present embodiment is roughly the same as the cap of the first embodiment, and common portions are indicated by common reference numerals. A circumferential micro-groove 23 is provided at substantially the center of the skirt portion lower portion 4a to be the peelable adhesive surface 11c, and a micro-projection 24 corresponding to the inner peripheral surface of the corresponding ring-shaped member 2 is formed to engage both. It is a feature.
[0072]
In this embodiment, since the skirt portion 4 and the ring-shaped member lower portion 2a are bonded at the interface 11c and are also meshed with the minute irregularities 23 and 24, a certain amount of external force acts on the ring-shaped member. In addition, there is an effect that accidental disconnection of the ring-shaped member 2 is prevented. Further, even when the adhesive force between the skirt portion 4 and the ring-shaped member 2 is low, there is an advantage that both are reliably engaged to prevent accidental dropout.
[0073]
According to the present invention, the cap body has an inner cylinder part having a diameter smaller than the diameter of the skirt part, an outer lid engaging screw part provided on the outer surface of the inner cylinder part, and an opening provided on the inner side of the inner cylinder part. The present invention can also be applied to a cap with a plug provided with a planned portion, a weakening portion that defines the planned opening portion, and an opening tab provided in the planned opening portion.
[0074]
[Example 8]
In a side sectional view (FIG. 30) and a bottom view (FIG. 31) showing an embodiment of the cap with an inner stopper, the cap roughly comprises a cap body 1, a ring-shaped member 2 and an outer lid 30. .
[0075]
In the pouring cap of this embodiment, the cap body 1 includes a skirt portion (outer cylinder) 4 that engages with the outer periphery of the bottle mouth portion, a top plate portion 3, and an inner ring (inner cylinder) that engages with the inner periphery of the bottle mouth portion. ) 6, a bottle seat receiving seat 8, a projection 5 provided on the inner surface side of the skirt portion lower portion 4a, and a notch 7 extending in the axial direction from the lower end 9 of the cap skirt portion 4 past the projection 5. The point and the ring-shaped member 2 are the same as those shown in Examples 1 to 7 in that the ring-shaped member 2 is in close contact with the skirt portion lower portion 4a via the peelable adhesive surface 11, but the following points are obtained. Has a different configuration.
[0076]
In this pouring cap, the inner ring 6 and the skirt portion 4 are connected by an annular connecting portion 31, and the inner ring 6 extends through the connecting portion 31 in the axial direction and extends in the axial direction. 32 is formed. A locking screw 33 with the outer lid 30 is formed on the outer periphery of the cylindrical extension portion 32. The upper end of the cylindrical extension part 32 is connected in the middle of the height direction of the inner cylinder part 34 for pouring with a small diameter. The lower end of the inner cylinder part 34 is connected to the top plate part (mouth wall) 3, and the upper end of the inner cylinder part 34 is a dropper 35 that opens outward.
[0077]
The pouring cap 1 according to the present embodiment includes a planned opening portion 36 provided on the mouth wall 3, a weakening portion 37 that defines the periphery of the planned opening portion, and an opening gripping portion 38 provided in the planned opening portion. By pulling up the opening gripping portion 38, the weakened portion 37 is broken to remove the planned opening portion 36 to form a pouring opening for contents.
[0078]
The outer lid 30 includes a top plate portion 39 and a skirt portion 40, and a locking screw 41 is formed on the inner surface of the skirt portion, and a grip knurling 42 is formed on the outer surface. An inner ring 43 that engages with the inner surface of the pour-out inner cylinder portion 34 is formed on the inner surface side of the top plate portion 39.
[0079]
When taking out the contents, the outer lid 30 is turned, the outer lid 30 is removed from the cap body 1 and, as already described, the opening gripping portion 38 is pulled up to break the weakened portion 37 and open the planned opening portion. 36 is removed, and a predetermined amount of content is poured out. Resealing with the outer lid 30 may be performed after use. When the used container is discarded, the ring-shaped member 2 is pushed up or pushed down to be detached by peeling at the peelable adhesive surface 11 and the cap body 1 is pulled up from the neck of the container. Thus, the container and the cap can be disposed of separately.
[0080]
[Example 9]
In a side sectional view (FIG. 32), a bottom view (FIG. 33), and a front view (FIG. 34) showing another embodiment of the cap with an inner plug, this cap has the same configuration as the cap of the embodiment 8. Compared to the cap of Example 8, the following features are additionally provided.
[0081]
A part of the outer periphery of the ring-shaped member 2 is provided with a peeling start tab 43 that protrudes upward from the upper part of the ring-shaped member. It will be understood that a gap 45 into which a nail can be inserted is formed between the peeling start tab 43 and the skirt portion 4. On the outer periphery of the ring-shaped member 2, a tear guide groove 44 extending downward along one edge of the peeling start tab 43 is provided. In the groove 44, the ring-shaped member 2 is thinned, and the ring-shaped member can be easily torn along the groove 44.
[0082]
When discarding the used container, the peeling start tab 43 provided on the ring-shaped member 2 is pulled out in the radially outward direction. As a result, the ring-shaped member 2 is torn at the portion of the groove 44, and peeling from the skirt portion lower portion 4a is started from the torn end of the ring-shaped member 2. In this case, the peeling on the peelable adhesive surface 11 is a peeling in the direction of about 90 degrees, so that there is an advantage that the peeling easily proceeds even when the adhesive strength on the adhesive surface is somewhat high.
[0083]
In FIG. 35 showing another modification of the cap of the ninth embodiment, instead of providing a tear guide groove on the outer periphery, a tear guide groove 44a may be provided on the inner periphery. Of course, in the cap of the present invention, the tearing start portion provided in the ring-shaped member 2 is not limited to the groove or perforation, and may be any weak portion as long as the tearing is easily performed. .
[0084]
The present invention, the cap body is an inner cylinder part serving as a spout with a diameter smaller than the diameter of the skirt part, an opening planned part provided on the inner side of the inner cylinder part, a weakening part that defines the opening planned part, A cap with an inner stopper provided with an opening tab provided in a planned opening portion, wherein a ring-shaped member is hinged and can be opened and closed via the hinge, and can be locked to the skirt portion. It is applicable also to what is equipped with.
[0085]
[Example 10]
Side cross-section (FIG. 36), top view (FIG. 37), bottom view (FIG. 38) and side view (FIG. 39) showing an embodiment of this type of cap with a cap according to the present invention, and the outer lid being closed In the front view (FIG. 40), the rear view (FIG. 41), and the side view (FIG. 42) showing the rough structure of the cap main body 1, the ring-shaped member 2, and the outer lid 30, it is almost the same as that shown in the eighth embodiment. The ring-shaped member 2 and the outer lid 30 are formed integrally with a hinge 45, and the outer lid 30 can be opened and closed via the hinge. Yes.
[0086]
The planned opening portion 36 of the cap body 1 is formed in a concave shape in order to keep the height of the opening gripping portion 38 low, and the cylindrical extension portion 34 also enables turning for opening and closing the outer lid. Therefore, a portion close to the hinge 45 is a stepped portion 46 having a low height. Further, an engaging projection 47 for engagement with the outer lid 30 is formed on the upper portion of the connecting portion 31 between the skirt portion 4 and the inner ring 6.
[0087]
On the other hand, an engagement recess 48 that engages with the engagement protrusion 47 of the cap body 1 is formed at the end of the skirt portion 40 of the outer lid 30. Further, a tab 49 for opening and closing the outer lid is formed on the opposite side of the hinge 45 of the outer lid 30.
[0088]
The hinge 45 that connects the ring-shaped member 2 and the outer lid 30 has a relatively wide width. However, the connecting pieces 60 and 60 having a small width are provided on both sides of the hinge 45 at a small interval from both ends of the hinge. Is provided. That is, recesses 61 are formed on the outer periphery of the ring-shaped member 2, while recesses 62 are also formed on the outer periphery of the outer lid 30, and these recesses 61, A connecting piece 60 is formed so as to connect between 62. In the structure of the connecting piece 60 as described above, tension is generated in the connecting piece 60 at a stage where the outer lid 30 is almost completely opened (FIG. 39), and at the position shown in FIG. 39 or a position close thereto. The outer lid 30 is stably held (the outer lid is prevented from shaking).
[0089]
In the state where the outer lid 30 is closed, the ring-shaped member 2 corresponding to the opening / closing tab 49 of the outer lid is formed with a recess 63 for facilitating gripping of the tab.
[0090]
In order to open the cap with the inner plug, the opening / closing tab 49 of the outer lid is lifted upward, the outer lid 30 is opened, and then the opening gripping portion 38 is pulled up to break the weakened portion 37 and open the opening. The planned portion 36 is removed, and a predetermined amount of content is poured out. After use, the outer lid 30 is tightened to engage the engaging projection 47 of the cap body 1 with the engaging recess 48 of the outer lid 30 to lock the outer lid. At this time, the inner ring 43 of the outer lid is engaged with the inner surface of the cylindrical extension 34 of the cap body 1 to perform resealing. When the used container is discarded, the ring-like member 2 is pushed up or pushed down together with the outer lid 30 to release the cap main body 1 by peeling off at the peelable adhesive surface 11 as in the above-described example. The container and the cap can be separated and discarded by pulling up from the container neck.
[0091]
【The invention's effect】
In the plastic cap of the present invention, the cap main body skirt portion and the ring-shaped member provided so as to cover the outer surface of the skirt portion are configured as described above, and the cap main body and the ring-shaped member are each of various types. Formed integrally with different resins, the lower part of the skirt part of the cap body and the ring-shaped member are connected via a joining surface that can be peeled over at least most of the circumference on the back side corresponding to the protrusions for engagement with the outer peripheral part of the container Thus, after removing at least a part of the ring-shaped member, the cap body can be detached from the container opening.
[0092]
The effects of the cap of the present invention are summarized as follows.
1. The skirt portion and the ring-shaped member on the outer periphery thereof can be formed so as to be separable without opening of a cut and when opened.
2. This eliminates the need for troublesome and troublesome operations such as forming cuts, and enables the production of caps with low productivity and high productivity.
3. Between the skirt portion and the ring-shaped member, the occurrence of a gap that causes intrusion of dust or water is prevented, and the hygienic characteristics are excellent.
4). At least in the stoppering state, the cap main body skirt portion is hooked by the ring-shaped member, and the skirt portion is prevented from spreading outward, and a reliable sealing performance against the container mouth portion is maintained.
5). When the ring-shaped member is removed from the outer periphery of the skirt part, the lower part of the skirt part can be expanded in the radial direction, and can be easily opened without using a special instrument, and from the container mouth part of the cap body. Can be easily removed.
6). After opening, a gap is formed between the skirt portion and the ring-shaped member, or the fact that the ring-shaped member is removed reveals the fact that the opening has been performed, and imparts tamper evidence.
7). In addition, since the entire cap is removed from the container opening, it is possible to separate and collect and discard the container and the cap.
[Brief description of the drawings]
FIG. 1 is a bottom view showing a cap (plastic crown) according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the cap of FIG. 1 along AA ′.
FIG. 3 is a partially enlarged view of the AA ′ cross section of the cap of FIG. 1;
4 is a partially enlarged view of the lower surface of the cap of FIG. 1. FIG.
FIG. 5 is an explanatory diagram for explaining a principle of forming a cap according to the present invention.
FIG. 6 is a bottom view showing a cap (plastic crown) of Example 2 of the present invention.
7 is a cross-sectional view of the cap of FIG. 6 along AA ′.
FIG. 8 is a partially enlarged view of the AA ′ cross section of the cap of FIG. 6;
9 is a partially enlarged view of the lower surface of the cap of FIG. 6. FIG.
FIG. 10 is a bottom view showing a cap (plastic crown) of Example 3 of the present invention.
11 is a cross-sectional view of the cap of FIG. 10 along AA ′.
12 is a partial enlarged view of the AA ′ cross section of the cap of FIG. 10;
13 is a partially enlarged view of the lower surface of the cap of FIG.
FIG. 14 is a bottom view showing a cap (plastic crown) of Example 4 of the present invention.
15 is a cross-sectional view of the cap of FIG. 4 along AA ′.
16 is a partial enlarged view of the AA ′ cross section of the cap of FIG. 4;
17 is a partially enlarged view of the lower surface of the cap of FIG. 4;
FIG. 18 is a bottom view showing a cap (plastic crown) of Example 5 of the present invention.
FIG. 19 is a cross-sectional view of the cap of FIG. 18 taken along the line AA ′.
20 is a partially enlarged view of the AA ′ cross section of the cap of FIG. 18;
21 is a partially enlarged view of the lower surface of the cap of FIG.
FIG. 22 is a bottom view showing a cap (plastic crown) of Example 6 of the present invention.
23 is a cross-sectional view of the cap of FIG. 22 along AA ′.
24 is a partially enlarged view of the AA ′ cross section of the cap of FIG. 22;
25 is a partially enlarged view of the lower surface of the cap of FIG.
FIG. 26 is a bottom view showing a cap (plastic crown) of Example 7 of the present invention.
27 is a cross-sectional view of the cap of FIG. 26 along AA ′.
28 is a partially enlarged view of the AA ′ cross section of the cap of FIG. 26. FIG.
FIG. 29 is a partially enlarged view of the lower surface of the cap of FIG.
FIG. 30 is a side sectional view showing a cap (cap with inner stopper) according to an eighth embodiment of the present invention.
31 is a bottom view of the cap of FIG. 30. FIG.
FIG. 32 is a side sectional view showing a cap (cap with inner stopper) of Example 9 of the present invention.
33 is a bottom view of the cap of FIG. 32. FIG.
34 is a front view of the cap of FIG. 32. FIG.
35 is a front view showing a modification of the cap of FIG. 34. FIG.
FIG. 36 is a side cross-sectional view showing a cap (cap with inner stopper) according to a tenth embodiment of the present invention with the outer lid opened.
37 is a top view of the cap of FIG. 36. FIG.
38 is a bottom view of the cap of FIG. 36. FIG.
39 is a side view of the cap of FIG. 36. FIG.
FIG. 40 is a front view showing a cap (cap with inner stopper) of Example 10 of the present invention with the outer lid closed.
41 is a rear view of the cap of FIG. 40. FIG.
42 is a side view of the cap of FIG. 40. FIG.
[Explanation of symbols]
1 Cap body
2 Ring-shaped member
3 Top plate
4 Skirt (outer cylinder)
4a Lower skirt
5 Protrusions
6 Inner ring (inner cylinder)
7 Notch
9 Bottom
10 Top
11a, 11b, 11c peelable adhesive surface
12 Opening tab
13 Ribs
15 Filling projection
16 steps
17 Small diameter part
18 outer periphery
19 Inner circumference
20 steps
21 Adhesive interface
22 Overhang part
23 Micro groove
24 microprotrusions
30 outer lid
31 connections
32 cylindrical extension
33 Locking screw
34 Inner tube
35 drops
36 Planned opening
37 Weakening part
38 Opening grip
39 Top plate
40 Skirt
41 Locking screw
42 Knurl for gripping
43 Inner Ring
44 groove
45 Air gap
46 steps
47 Protrusion for engagement
48 Recess for engagement
49 Open / close tab
50 Primary injection device
51 Secondary injection device
52A, 52B Cavity mold
53 Fixed Platen
54A, 54B Core mold
55 Mold reversing device
56 Movable platen
57A, 57B Runner
58 runner club
59 products
60 connecting pieces
61 recess
62 recess
63 recess

Claims (15)

  Resin made of a cap body having a skirt portion and a receptacle seat for the container mouth inside the skirt portion, and a continuous ring-shaped member integrally provided on the cap body so as to cover the outer surface of the skirt portion of the cap body In the cap, the cap main body and the ring-shaped member are integrally formed of different types of resins, and a protrusion that engages with the outer peripheral portion of the container mouth is formed on the inner surface side of the skirt portion of the cap main body. The skirt portion of the cap body is provided with a plurality of notches extending in the axial direction from the lower end in the axial direction at least in the circumferential direction, and the skirt portion of the cap body, the ring-shaped member, Is bonded to the back side corresponding to the protruding portion via a bonding surface that can be peeled over at least most of the circumference, and removes at least a part of the ring-shaped member. Resin cap, characterized in that the removal from the container mouth portion of the cap body is made possible after.   One of the cap body and the ring-shaped member is made of high-density polyethylene or a propylene-based polymer, and the other is made of low-density polyethylene, linear low-density polyethylene, or an ethylene-based copolymer. The resin cap according to 1. Cap one body and the ring-shaped member is composed of a propylene polymer, resin cap according to claim 1, wherein the other is characterized in that it consists of high-density polyethylene.   The resin cap according to claim 1, wherein the cap body is a resin crown having a top surface portion.   An inner cylinder part having a diameter smaller than the diameter of the skirt part, a screw part for engaging an outer lid provided on the outer surface of the inner cylinder part, a planned opening part provided on the inner side of the inner cylinder part, The resin cap according to claim 1, wherein the cap is a cap with an inner plug provided with a weakening portion that defines the planned opening portion and a tab for opening provided in the planned opening portion.   The cap body has an inner cylinder portion serving as a spout with a diameter smaller than the diameter of the skirt portion, a planned opening portion provided inside the inner cylinder portion, a weakening portion that defines the planned opening portion, and a planned opening portion. A cap with an inner stopper provided with a tab for opening provided, and a ring-shaped member including a hinge and an outer lid that is connected to the skirt portion so as to be openable and closable and can be locked to the skirt portion. The resin cap according to claim 1, wherein:   2. The resin-made resin according to claim 1, wherein the peelable adhesive surface is located on a tapered surface formed between a ring-shaped member whose inner diameter decreases downward and an outer peripheral portion of the skirt portion whose outer diameter decreases downward. cap.   2. The resin-made resin according to claim 1, wherein the peelable adhesive surface is located on a tapered surface formed between the ring-shaped member whose inner diameter decreases upward and the outer periphery of the skirt portion whose outer diameter decreases upward. cap.   The peelable adhesive surface is engaged with the outer surface of the skirt portion and the inner surface of the ring-shaped member via a minute protrusion provided on one side and a minute concave portion provided on the other side. The resin cap according to 1.   The resin cap according to claim 1, wherein a tab for pushing down or pushing up is formed on a part of the ring-shaped member.   The resin cap according to claim 1, wherein the ring-shaped member is peelably bonded over the entire circumference. The resin cap according to claim 10, wherein the ring-shaped member is non-detachably locked to the cap body on the opposite side of the tab and is peelably bonded to other portions.   The ring-shaped member has a weakening portion or a tearing start portion extending in a height direction in a part of a circumference, and a tearing tab adjacent to the weakening portion or the tearing start portion. The resin cap according to 1.   2. A resin-filled projection that forms at least a part of the ring-shaped member is formed in a notch provided in the outer peripheral portion of the skirt portion of the cap body. Resin cap. 15. The resin cap according to claim 14 , wherein the notch portion provided in the outer peripheral portion of the skirt portion of the cap body is formed with a wide interval on the inner surface side and a narrow interval on the outer surface side.

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