JP2000247347A - Resin cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin cap capable of attaining a secure tamper evident(TE) property and having both reliable sealing performance and an easy and secure easy-to-open performance. SOLUTION: This resin cap is comprised of a continuous ring-like member 2 integrally arranged at a cap main body 1 to cover an outer surface of a skirt part 4 of the cap main body 1 and having at its outer circumference a cap opening tab 15; a plurality of recesses 11 spaced apart in a circumferential direction at the skirt part of the cap main body 1 to extend in an axial direction; a connecting part between the continuous ring-like member 2 arranged at the opposite side of the cap-opening tab and the skirt part 4; a circular or arcuate cutting surface arranged between the skirt part 4 and the ring-like member 2; a plurality of breakable bridges connecting at either a lower side or an upper side than the cutting surface the skirt part 4 with the ring-like member 2; breakage guide parts 16 extending from both sides of the connecting part to a top plate part 3; and a pair of scores arranged outside an inner plug at the top plate part and connected to the breakage guide parts 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to resin caps having a combination of improved tamper-evident properties, sealing reliability and openability, and more particularly to container closures in place of conventional metal crowns. Can be used for tapping, and opening the cap irreparably destroys the cap.
The present invention relates to a cap capable of obtaining a reliable tamper-evident property (TE) and having both a reliable sealing performance and an easy and reliable easy opening performance.

[0002]

2. Description of the Related Art Resin caps can be integrally molded.
Since it has excellent moldability and flexibility, it can be fixed to the container mouth by a stoppering operation, and has been widely used in various forms.

A variety of resin caps which have excellent sealing properties and which can be easily removed from the mouth of the container without using tools have already been proposed, for example, Japanese Patent Publication No. 51-10555. Gazette (known example 1)
Discloses a synthetic resin tamper-proof lid having a handle on the outer surface of a skirt wall. The handle of the lid is formed at a distance from and surrounding the outer peripheral surface of the skirt wall, but is not a complete ring but an arc shape, and both ends of the lid are formed on the outer surface of the skirt wall. It is firmly fixed. Further, the inner surface of the handle is connected to the outer surface of the skirt wall by a plurality of easily-cut connecting pieces formed at appropriate intervals in the circumferential direction. Therefore, when the handle of the lid attached to the container is pulled up by hand, the connecting piece is cut, and the handle is connected to the skirt wall only at both ends, and by further pulling up the handle, The skirt wall is turned up from the portion where the handle is not formed (between both ends of the handle), and the lid is removed from the container.

Further, Japanese Patent Application Laid-Open No.
JP-A-221155 (known example 2) discloses a cap body comprising a top plate portion and a skirt portion, and a projection (undercut portion) provided on the inner surface of the skirt portion to engage with a container mouth portion, and the cap body. In a resin cap made of a continuous ring-shaped member integrally provided on the cap body so as to cover the outer surface of the skirt portion, a plurality of notches extending in the axial direction are formed in the skirt portion of the cap body in the circumferential direction. A skirt portion of the cap body and the ring-shaped member are separated from each other through a cut surface, and a plurality of breakable bridging portions above or below the cut surface are provided. Further, the outer surface of the cap body skirt portion and the inner surface of the ring-shaped member are in close contact with each other at the cut surface, and are formed integrally through the connecting portion. Cap, characterized in that the opening tab is formed is described.

[0005]

The above-mentioned known example 1 is to provide a plastic cap which can be opened by hand without requiring any special tool such as a bottle opener, and which also has a function of preventing fraud. Although significant, there is a problem in terms of compatibility between sealing reliability and easy opening. That is, since the above-mentioned handle is formed so as to be spaced from and surround the outer peripheral surface of the skirt wall, the handle cannot reinforce the sealing effect of the ridge. Therefore, it is necessary for the ridge to have both easy opening and sealing performance by itself, but in fact, if the opening performance is improved, the sealing reliability becomes unsatisfactory. .

In the second prior art, the outer ring-shaped member protects the bridging portion so that the plugging operation can be easily performed, and the notched portion is formed by breaking the bridging portion and removing the outer ring-shaped member. The provided skirt portion spreads outward, opening by hand is also easily performed, and also has a certain tamper-evident function, but in terms of compatibility between sealing retention and easy-opening, There is also room for improvement in terms of the tamper-evidence function.

That is, the thickness of the outer ring member is
There is a certain range in terms of compatibility between the seal holding property and the moldability. If the thickness is too large, it becomes difficult to die-cut the projection (undercut portion) on the inner surface of the skirt, while the thickness of the outer peripheral ring-shaped member is reduced. If the thickness is too small, the force for holding the container mouth portion by the projections is insufficient, and the sealing and holding properties are likely to be insufficient. In this manner, the thickness of the outer peripheral ring-shaped member is determined to be within a certain range. In this case, since the notch portion of the skirt also has the notch, the notch portion or the vicinity thereof is not included. However, there is a problem that the holding force of the container mouth portion tends to be insufficient.

[0008] If the opening has already been performed,
Since the bridging portion is broken and the ring-shaped member can be freely moved up and down, it can be known that the seal has already been opened. However, it is desired to further improve the tamper-evident property.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the prior art and to provide a resin cap having a combination of improved tamper-evident properties, sealing reliability and openability, especially a container which replaces the conventional metal crown. Can be used for tapping the mouth, and by opening the cap, the cap is irreparably broken, ensuring reliable tamper-evident properties (TE), as well as reliable sealing performance and easy and reliable An object of the present invention is to provide a cap that is compatible with easy opening performance.

[0010]

According to the present invention, a top plate portion and a skirt portion are formed, a projection engaging with a container mouth portion is formed on an inner surface of the skirt portion, and a container mouth portion is formed on an inner surface of the top plate portion. A cap body provided with an inner plug inserted into the cap body, a continuous ring-shaped member integrally provided with the cap body so as to cover an outer surface of a skirt portion of the cap body, and having an opening tab on an outer periphery, the cap body A plurality of notches provided in the skirt portion in the circumferential direction so as to extend in the axial direction, a connecting portion between the continuous ring-shaped member provided on the opposite side of the opening tab and the skirt portion, the skirt A circumferential or arcuate cut surface provided between the portion and the ring-shaped member, a plurality of breakable bridging portions connecting the skirt portion and the ring-shaped member below or above the cut surface, Communicating Breaking guide portion extending top plate portion from both sides of the parts, cap, characterized in that it consists of a pair of scores that is connected to and the break guide portion is provided on the outside of the inner plug top plate portion is provided. In the cap of the present invention, 1. Each of the scores is provided in a range where an opening angle from the center is 30 to 120 °. Notch portions are located on both sides of the connecting portion, and the upper edge of the notch portion is open to the skirt portion above the ring-shaped member, and the fracture guide portion extends from the notch portion on both sides of the connecting portion to the top plate portion. 2. extending towards 3. the fracture guide is a slit or a score; 4. The score comprises a groove which is opened on the inner surface of the top plate portion facing the top surface of the container mouth; The score, the thickness _{t 1} at the groove bottom is made of the grooves is 0.2 to 0.7 mm, 6. 6. On the inner surface of the top plate portion, a small ring-shaped projection is formed on the outer surface of the inner plug so as to engage with the top surface, outer peripheral side corner portion, or outer peripheral surface of the container mouth; Preferably, the ring-shaped member is formed with a radially outwardly projecting portion at a position corresponding to the cutout portion.

[0011]

DETAILED DESCRIPTION OF THE INVENTION A cap according to the present invention comprises: A cap body comprising a top plate portion and a skirt portion, a projection portion formed on the inner surface of the skirt portion for engaging with the container mouth portion, and an inner plug inserted into the container mouth portion on the inner surface of the top plate portion; . B. a continuous ring-shaped member integrally provided with the cap body so as to cover the outer surface of the skirt portion of the cap body and having an opening tab on the outer periphery; A plurality of notches provided in the skirt portion of the cap body so as to extend in the axial direction at intervals in the circumferential direction; B. a connection between the skirt portion and the continuous ring-shaped member provided on the opposite side of the opening tab; A circumferential or arcuate cut surface provided between the skirt portion and the ring-shaped member, and a plurality of breakable bridging portions connecting the skirt portion and the ring-shaped member below or above the cut surface. F. A break guide portion extending from both sides of the connecting portion to the top plate portion,
And G. A pair of scores are provided outside the inner plug of the top plate and connected to the break guide.

Since the inner plug of the cap body of the present invention is formed on the top surface of the cap body so as to be engaged with the inner periphery of the container mouth, the inner periphery of the container mouth is sealed. A projection (undercut) that engages with the outer periphery of the container mouth is formed, and the combination thereof enables reliable holding and sealing of the cap to the container mouth.

First, by providing a plurality of notches extending in the axial direction at intervals in the circumferential direction in the skirt portion of the cap body, the skirt portion can be spread radially outward when the cap is opened. This facilitates removal of the cap body from the container opening.

In this cap, the skirt portion of the cap body and the ring-shaped member are separated via a circumferential or arcuate cut surface, but these are separated from each other by a plurality of lower or upper cut surfaces. It is formed integrally via the breakable bridging portion and the connecting portion, and the outer surface of the cap body skirt portion and the inner surface of the ring-shaped member can be in close contact with each other at the cut surface.

By bringing the skirt portion and the ring-shaped member into close contact with each other at the cut surface, the cap body skirt portion is snapped by the ring-shaped member at least in the closed state, and the skirt portion is prevented from spreading outward. Reliable sealing of the container mouth is maintained. This is particularly important in the case of the present cap in which the skirt is provided with a notch extending in the axial direction. That is, the notch in the skirt acts to weaken the state of engagement between the outer periphery of the container mouth and the projection (undercut) of the skirt, and the slack tightening force of the ring-shaped member acts on this. Thereby, the engagement state can be made firm and reliable.

Also, a plurality of breakable bridging portions and connecting portions for connecting the skirt portion of the cap body and the ring-shaped member are provided below or above the cut surface, so that the cut surface is engraved. Is prevented from adversely affecting the bridging portion or the connecting portion. Further, even at the time of plugging, the outer surface of the cap body skirt portion and the inner surface of the ring-shaped member are in close contact at the cut surface portion, so that the bridging portion which is easily broken Thus, the advantage that external force is prevented from acting on the bridge portion and the protection of the bridge portion at the time of plugging is thorough is achieved.

In addition, an opening tab projecting radially outward is formed on a part of the ring-shaped member, and a connecting portion between the skirt portion and the continuous ring-shaped member is provided on the opposite side of the opening tab. By pushing up the opening tab, a displacement occurs between the ring-shaped member and the skirt portion on the cut surface, and the bridging portion connecting the cap body and the ring-shaped member is cut by shearing force. Then, by further lifting the ring-shaped member, the connecting portion becomes a fulcrum, and an opening force is applied to the connecting portion side, and the opening progresses by an operation described later in detail. That is, since the cap body skirt portion is provided with a notch, when the ring-shaped member is removed from the skirt portion and lifted, the skirt portion is free to spread radially outward, and the connection portion side The cap body can be easily detached from the container mouth, and can be easily opened without using any tool.

If the opening has already been performed,
Since the bridging part has been broken and the ring-shaped member can be moved up and down freely, it can be known that the seal has already been opened.However, in order to further improve the tamper-evident property, as described below, Irreparable breaking of the cap with the stopper ensures reliable tamper-evident (TE).

That is, in the present invention, for this purpose, a break guide portion extending from both sides of the connecting portion to the top plate portion is provided on the skirt portion, and connected to the break guide portion outside the inner ring of the top plate portion. Score. In the present invention, since the connecting portion between the skirt portion and the continuous ring-shaped member is provided on the opposite side of the opening tab, by pushing up the opening tab, the gap between the ring-shaped member and the skirt portion at the cut surface. The gap between the cap body and the ring-shaped member is cut by the shearing force, and then the ring-shaped member is further lifted up, so that the connection portion becomes a fulcrum and is moved toward the connection portion. As described above, the opening force is applied, and the opening force applied to the connecting portion side is used for breaking the top plate by shearing.

First, when the ring-shaped member is lifted, the engagement between the skirt projection and the outer periphery of the container opening at the connection portion is released by the opening force applied to the connection portion, and the connection portion is lifted upward. At the same time, pulling out of the inner plug on the connecting portion side is also started. In this state, the skirt projection and the outer periphery of the container mouth still maintain the engaged state at the portion other than the connection portion, and therefore, a shear force is applied between the raised connection portion and the other cap body. Is generated, and this shearing force is transmitted to the score of the top plate connected thereto through the breaking guides on both sides of the connecting portion. Thus, by continuing the lifting by gripping the ring-shaped member, the shearing of the score of the top plate progressed, and it became apparent at first glance that the cap body was irreparably damaged by opening, and the tamper-evident property was significantly improved. I do.

In the present invention, providing a score connected to the break guide on the outer side of the inner ring of the top plate and breaking the score when the cap is opened can improve the easy opening property. Has also helped. That is, as already pointed out, the inner plug engaged with the inner peripheral side of the container mouth and the projection (undercut) provided on the inner surface of the skirt and engaged with the outer periphery of the container mouth cooperate with each other. Thus, the cap can be securely held and hermetically held in the container mouth, but the two are cut off at the score and the cooperative relationship between them is cut off, so that the skirt remaining and held in the container mouth is cut off. It is easy to remove the projection.

According to the present invention, by providing a score that is sheared when the plug is opened between the inner plug and the engaging projection (undercut portion), reliable sealing performance and easy and reliable ease are provided. The advantage that it is possible to achieve both the opening performance and the opening performance is also achieved. Generally, in a resin cap having an inner plug and an engagement projection (undercut), it is difficult to open the cap when the sealing performance is enhanced, and conversely, when the opening performance is enhanced, the sealing performance tends to be reduced. Although it was difficult to balance both, in the present invention, by providing a score between the two, by keeping the score as it is when sealing, by opening the score by shearing the score , Both functions can be satisfied.

In the present invention, each score provided on the top plate has an opening angle (α) from the center of 30 to 120.
, Particularly preferably in the range of 70 to 115 °. When the opening angle (α) is within the above range, the score can be smoothly torn, and most of the top plate portion is torn, so that the opening clear function is sufficient.

In the present invention, the notch is located on both sides of the connecting portion, and the upper edge of the notch is open to the skirt above the ring-shaped member. It is advantageous for the break guide to extend from the notch towards the top plate in order to effectively transfer the tearing force to the score of the top plate. That is, the notches located on both sides of the connecting portion facilitate lifting of the connecting portion when the plug is opened, and the break guides extend from the notches on both sides of the connecting portion. It also acts as a starting point. That is, when the fracture guide is a complete cutting line such as a slit, the lifting of the connecting part and the skirt part connected thereto proceeds easily, but the notch is also formed when the fracture guide is a score. As a starting point, the shearing of the score is started, and the top plate score is effectively broken by lifting the connecting portion and the skirt portion connected thereto.

On the inner surface of the top plate portion of the cap of the present invention, a small ring-shaped projection engaging with the top surface, outer peripheral side corner portion or outer peripheral surface of the container mouth portion is formed outside the inner plug. Is preferred in terms of sealing performance. The position where the small protrusion is provided may be a position between the inner plug and the top plate score or a position outside the top plate score. In the cap of the present invention, as already pointed out, an inner plug to be inserted into the container mouth portion is formed on the top surface portion, while a projection portion that engages with the outer periphery of the container mouth portion is provided on the skirt portion, so that the cap is provided. It is possible to hold the container at the mouth and maintain the sealing property. However, the sealing engagement between the inner plug and the container mouth portion is an engagement in which the outer peripheral surface of the inner plug and the inner peripheral surface of the container mouth portion are pressed against each other in the radial direction, but a ring-shaped member provided outside the inner plug. In the small projection, the top surface of the container mouth, the outer peripheral side corner or the outer peripheral surface, and the ring-shaped small projection can be sealed and engaged in the axial direction of the container. With this type of cap of the present invention, two types of sealing engagements having different directions are thus possible, and sealing reliability is improved. Furthermore,
The sealing on the top surface of the container mouth or on the outer peripheral side therefrom has the additional advantage that the top surface of the container mouth is maintained in excellent hygiene.

In the above cap with a ring-shaped small projection,
It is preferable that a ring-shaped groove is formed inside and / or outside the small protrusion. Since the small ring-shaped projection and the container mouth are pressed against each other in the axial direction, the ring-shaped projection is naturally compressed and deformed. However, the inner and / or outer grooves allow this compression deformation, and the ring-shaped projection is formed. Has the effect of providing cushioning. Also, the ring-shaped groove formed between the small ring-shaped protrusion and the inner plug prevents the deformation of one of them from adversely affecting the other, and maintains each sealing function independently. There is also action.

In the present invention, it is preferable to form a radially outward projection on the ring-shaped member at a position corresponding to the notch of the skirt. In other words, the thickness of the outer peripheral ring-shaped member has a certain range with respect to compatibility between the seal holding property and the moldability. If the thickness is too large, the protrusion (undercut portion) on the inner surface of the skirt portion may be die-cut. On the other hand, if the thickness of the outer peripheral ring-shaped member is too small, there is a problem that the force for holding the container mouth portion by the projection (undercut portion) becomes insufficient, and the sealing retention tends to be insufficient. . When the thickness of the outer peripheral ring-shaped member is set to a constant thickness as a whole in a range in which die cutting is easily performed,
In the notch of the skirt, since the protrusion is also notched, there is a tendency that the holding force of the container opening at or near this notch is insufficient.

According to this aspect of the present invention, since the radially outwardly projecting portion is formed at a position corresponding to the skirt cutout portion of the ring-shaped member, the portion corresponding to this projecting portion becomes thicker, The advantage is achieved that the holding force of the container mouth at or near the cutout of the skirt can be maintained at a sufficient level. That is, the protruding portion of the skirt is divided by the cutout portion, and the circumferential end of the divided protruding portion is most likely to expand in the radially outward direction, but is formed by the thick portion (outward protruding portion) of the ring-shaped member. The clamping force acts on this circumferential end, so that a satisfactory holding force is achieved when closing. In addition, since the radially outward projecting portion is provided at a position corresponding to the skirt cutout portion, the advantage that the projecting portion (undercut portion) on the inner surface of the skirt portion can be easily die-cut is also achieved. Things.

In the cap of the present invention, as already pointed out, the ring-shaped member serves as a gripping piece, and the top plate is opened from the connecting portion side by breaking the score. Therefore, the ring-shaped member in a state where the bridging portion is broken is required to have mechanical strength that is not defeated by the opening force. On the other hand, when the cap is formed by injection molding, in the ring-shaped member, a portion corresponding to the skirt cutout portion becomes a resin weld portion, and there is also a tendency that the mechanical strength of this portion tends to be insufficient. . In the cap of this type according to the present invention, as described above, since the protrusion in the radial direction is formed at the position corresponding to the skirt cutout portion of the ring-shaped member, the portion corresponding to this protrusion becomes thick. ,
The reinforcement of the weld portion is also provided, which has the additional advantage that the opening operation can be performed without failure.

In the present invention, the opening tab is provided on the outer periphery of the ring-shaped member. The portion of the ring-shaped member provided with the opening tab is provided inside the tab and below the ring-shaped member. It is preferable to provide a cutout from the inner surface side of the member, from the viewpoint of moldability, that is, to facilitate die cutting. That is, the opening tab is provided so as to protrude radially outward from the ring-shaped member in order to improve the engagement with the finger. However, when this tab portion becomes thicker, the skirt protrusion (underside) located inside the opening tab is provided. Cut part)
It becomes difficult to remove the mold. In the present invention, since the cutout portion is provided from the inner surface side of the ring-shaped member inside the tab and below the ring-shaped member, the cutout portion is formed as a skirt projection (undercut portion) at the time of die cutting. , And the mold can be easily removed. Also, by forming a plurality of ribs on the outer surface of the opening tab,
The strength of the opening tab can be reinforced and its position can be specified.

In the cap of the present invention, the cap body skirt portion and the ring-shaped member are integrally formed by injection or compression molding, and then a cut is made between them to form a bridging portion and a connecting portion. It can be formed by separating the parts to be removed, and is manufactured by using a mold composed of a normal core and a cavity, so that the molding operation is also easy.

In the cap of the present invention, the lower end of the ring-shaped member can be positioned below the lower end of the skirt portion of the cap body. Concealed by
It is possible to prevent the bridge portion from being opened without breaking the bridge portion by inserting an instrument or the like into the skirt portion, thereby improving the tamper-evident property.

Further, the lower end of the ring-shaped member and the lower end of the skirt portion of the cap body may be provided so as to be located on the same horizontal plane. In this case, when the empty cap is loaded, a load or the like is applied to the bridging portion and the breakage occurs. Can be prevented.

Further, a partially weakened portion can be formed in the upper or lower portion of the connecting portion, so that when a device or the like is inserted into the connecting portion and illegal opening is attempted, a ring-shaped portion is formed. The member is opened outward, the engagement of the device is easily released, and the tamper-evident property is improved.

In the cap of the present invention, the inner plug can be relatively long on the tab side and relatively short on the connecting portion side, so that the inner plug has an inclined edge. That is, although it has already been pointed out that the opening of the cap body is performed from the connecting portion side by lifting the ring-shaped member, when opening from the connecting portion side, leakage (gas release) from the shorter inner plug is performed. ) Is effectively performed, so that blowing of contents, that is, blow-off is effectively prevented.

Also, a gas barrier material can be insert-molded on the top surface of the inner surface of the inner plug, thereby preventing gas from permeating through the plastic cap wall and improving the storage stability of the contents.

Further, in the cap according to the present invention, the entire periphery or an intermittent plug protruding upward can be formed on the outer peripheral portion of the top surface portion, whereby the containers with the caps plugged can be mutually connected. When loaded, especially when the contents are carbon dioxide beverages, the domed top surface is pressed by the internal pressure, preventing the engagement projections of the skirt from spreading outward in the radial direction. Can be increased.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. In the accompanying drawings, FIG. 1 is a partially sectional side view of an embodiment of the cap of the present invention, FIG. 2 is a bottom view of the cap of FIG. 1, and FIG. 3 is a front view of an opening tab of the cap of FIG. FIG. 4 is an enlarged cross-sectional view of a gate portion of the cap of FIG. 1, and FIG. 5 is a sectional view of the cap of FIG.
FIG. 6 is an enlarged cross-sectional view showing the cap of FIG. 1 in a cross section taken along the line CC ′ in FIG. 2, and FIG.
FIG. 2 shows a state in which the cap of FIG.
8 is a cross-sectional view taken along the line BB ′ of FIG. 1, FIG. 8 is a cross-sectional view taken along the line CC ′ of FIG. 2 with the cap of FIG. FIG. 10 is an explanatory view showing an opened state of the cap of FIG. 10, FIG. 10 is a partially sectional side view of another embodiment of the cap of the present invention, FIG. 11 is a bottom view of the cap of FIG. 10, and FIG. FIG. 13 is an enlarged cross-sectional view showing the cap of FIG. 10 along the line BB ′ of FIG. 11, FIG. 13 is an enlarged cross-sectional view of the cap of FIG. 10 along the line CC ′ of FIG. 11, and FIG. FIG. 15 is a cross-sectional view taken along the line BB ′ of FIG. 11 in a state where the cap is attached to the container mouth, and FIG. 15 is a state in which the cap of FIG. '' Is a sectional view shown in section,
FIG. 16 is a side sectional view of still another embodiment of the cap of the present invention, and FIG. 17 is a bottom view of the cap of FIG.
FIG. 18 is an enlarged cross-sectional view showing the cap of FIG. 16 taken along the line BB ′ of FIG. 17, and FIG.
FIG. 7 is an enlarged sectional view taken along the line CC ′ of FIG.

[Embodiment 1] In FIGS. 1 to 8, the cap of the present invention roughly comprises a cap body 1 and a continuous ring-shaped member 2. The cap body 1 includes a top surface portion 3 and a skirt portion 4 hanging from the outer periphery thereof.

As best shown in FIGS. 7 and 8, a projection 7 is formed on the inner periphery of the skirt portion 4 to engage with the lower surface of the projection 6 on the outer peripheral side of the container mouth portion 5. 5 is brought into close contact with the inner surface of the top surface portion 3 to perform sealing. An inner plug 8 that engages with the inner peripheral surface 9 of the container opening 5 is formed on the top surface 3. In this specific example, a radially outward projection 10 is formed on the outer peripheral surface of the inner plug 8, and the inner plug 8 is pressed against and engaged with the inner peripheral surface 9 of the container mouth 5 to further ensure sealing. It has become.

The ring-shaped member 2 is provided so as to cover 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 11 extending in the axial direction from below to the middle of the skirt portion at intervals in the circumferential direction. The notch 11 is provided so that the upper edge thereof is located above the protrusion 7 of the skirt portion, so that when the ring-shaped member 2 is removed, the notch 11 extends radially outward of the protrusion 7. This is preferable for facilitating spreading and improving easy-opening properties. For this reason, in the specific example shown in the drawings, the cutout portion 11 is opened at a part of the skirt portion 4 in the height direction. . In this cap, the contents attached to the outer periphery of the mouth at the time of filling the contents can be passed through the cutout portion 11 to be washed and removed, and the hot water shower liquid in the sterilization step can be effectively passed, The advantage of increasing the thermal conductivity to the container mouth is obtained.

The skirt portion 4 and the ring-shaped member 2 of the cap body 1 are separated from each other through an arcuate or circumferential cut surface 12, and the skirt portion 4 and the ring-shaped member 2 are separated from the cut surface. It is formed integrally with a plurality of rupturable bridging portions 13 below 12 and a non-breakable connecting portion 14.

The outer surface of the cap body skirt portion 4 and the inner surface of the ring-shaped member 2 correspond to the cut surface 12 when the cap body 1 is plugged into the container mouth 5 (FIGS. 7 and 8). They are in close contact with each other.

Further, an opening tab 15 is formed on a part of the ring-shaped member 2 so as to protrude in a radially outward direction, so that when opening the stopper, the part is gripped and the ring-shaped member 2 can be pushed up. Has become. On the other hand, the connecting portion 14 between the skirt portion 4 and the ring-shaped member 2 is provided on the opposite side of the opening tab 15. The cut surface 12 may be arc-shaped or circumferential (circumferential). In this specific example, the cut surface 12 is circumferential and, as shown in FIG. Is filled with resin below the lower edge of the bridging portion 13 to form a non-breakable connecting portion. On the other hand, when the cut surface 12 is formed in an arc shape excluding the connecting portion 14, it is not necessary to consider that the resin is deeply filled as in the case described above. Of course, when the cut surface 12 is formed in an arc shape, it is necessary to position the cap at the time of the cutting process. On the other hand, when the cut surface is formed in a circumferential shape, the positioning is unnecessary at the time of cutting. The processing method is selected in consideration of the advantages and disadvantages.

In the present invention, as shown in FIGS. 1 and 2, the skirt portion 4 of the cap body is provided with break guide portions 16 and 16 (slits) extending from both sides of the connecting portion 14 to the top plate portion 3, It is a remarkable feature that a pair of scores 17, 17 connected to the breaking guide portion 16 is provided on the outer side of the inner plug 8 of the top plate portion 3, and the cap is irreparably broken by opening the cap. It is possible to impart a clear and reliable tamper-evident property (TE), and to achieve both a reliable sealing performance and an easy and reliable easy-opening performance.

At the time of opening, the engagement between the skirt projection 7 and the outer periphery 6 of the container at the connecting portion is released by the opening force applied to the connecting portion 14 by lifting the ring-shaped member 2. The connecting portion 14 is lifted upward, and at the same time, pulling out of the inner plug 8 on the connecting portion side is started. In this state, the skirt portion protrusion 7 and the outer periphery 6 of the container mouth still maintain the engaged state in the portion other than the connection portion 14, and therefore, the gap between the raised connection portion 14 and the other cap body is not maintained. Generates a shearing force, and this shearing force is transmitted to the score 17 of the top plate connected thereto through the breaking guides 16 on both sides of the connecting portion. Thus, as shown in FIG. 9, by continuing to lift the ring-shaped member 2 by gripping, the shearing of the scores 17, 17 of the top plate portion 3 progresses, and the cap body becomes the top plate portion 3 with the inner plug.
a and the skirt portion 4a with the protruding portion, it is apparent at first glance that the irreparable damage has occurred, and the tamper-evident property is significantly improved. Further, the cap body is divided into a top plate 3a with an inner plug and a skirt 4a with a projection, and the inner plug 8 has already been pulled out. The disengagement with the outer periphery 6 of the container mouth is also easily performed.

In the cap of this embodiment, as shown best in FIG. 2, notches 11, 11 are located on both sides of the connecting portion 14, and as shown in FIG. The upper edge of the portion 11 is open to the skirt at a position above the ring-shaped member 2, and furthermore, the fracture guides 16, 16 extend toward the top plate 3 from the notches 11, 11 on both sides of the connecting portion. . In this embodiment, the break guides 16 are formed as slits, that is, complete cut lines. In this configuration, the engagement between the skirt projecting portion 7 and the outer periphery 6 of the container mouth on the connecting portion side, and the connecting portion 1
The breaking guide 16 is preferably a slit, since the lifting of the upper portion 4 is selectively and easily performed, and the score 17 of the top plate portion is easily sheared. This slit extends to the top plate portion, and its tip is the cut start side end (connection portion side end) 1 of the score 17 of the top plate portion.
9 is preferably formed in a positional relationship that overlaps with 9.

Of course, the breaking guide 16 can be scored under the condition that the shearing is easily performed. In this case, too, the notch 11 becomes the starting point of the tearing, and the shearing of the score is started. The breaking of the top plate score 17 due to the lifting of the connecting portion 14 and the skirt portion connected thereto is effectively performed.

In this embodiment, the score 17 provided on the top plate portion is formed of a groove which is opened on the inner surface of the top plate portion facing the top surface 18 of the container mouth (see FIG. 8). In the case of this embodiment, the cross-sectional shape of the groove is trapezoidal, but may be any shape such as U-shaped, V-shaped, semi-circular, semi-elliptical.

The score in the top plate portion 17, it is preferable that the thickness _{t 1} at the groove bottom is made of the grooves is 0.2 to 0.7 mm, in particular 0.3 to 0.5 mm. If the thickness is less than the above range, the score tends to be broken at the time of plugging, and if the thickness is more than the above range, the shearing force becomes too high, which is likely to cause poor opening.

The score 17 provided on the top plate portion is provided in the form of an arc having a diameter larger than the outer diameter of the inner plug 8, and the opening angle (α) from the center thereof is preferably in the range described above. I have. As shown in FIG. 2, the end 20 of the score 17 at the end of the tearing extends outwardly from the arc by a small distance, that is, toward the opening tab side, in order to smoothly pull out the inner plug. preferable.

On the inner surface of the top plate portion 3 of the cap of this embodiment, a ring-shaped small projection 21 which engages with the top surface of the container opening outside the inner plug 8 and the outer peripheral surface of the container opening. A ring-shaped small protrusion 22 is formed. The outermost small protrusion 22 engages with the outer peripheral surface of the container mouth to correctly position the top surface 18 of the container mouth.
Of course, the small projections 22 may have a sealing function.
On the other hand, the other small protrusion 21 provided inside the small protrusion 22 extends downward, and the top surface 1
8 and the cap are engaged in the axial direction to perform sealing at the top surface. As shown in FIGS. 6 and 8, the axial small protrusion 21 is provided adjacent to the inside of the score 17, and between the small protrusion 21 and the inner plug 8 is provided.
A groove 23 is formed circumferentially to allow the small protrusion 21 to be compressed and deformed during sealing, and to maintain the small protrusion 21 and the inner plug 8 independently.

In the present invention, as is clearly shown in FIGS. 1 and 2, the outer circumferential surface of the ring-shaped member 2 is provided at the position corresponding to the cutout portion 11 of the skirt portion in the radially outward direction.
Is preferably formed. By forming the protruding portion 24 on the ring-shaped member 2, it is possible to achieve both the sealing retention and the moldability (removability), that is, to remove the protruding portion (undercut portion) 7 on the inner surface of the skirt portion. The protrusion (undercut portion) 7
Thus, the force for holding the container opening 5 can be set to a sufficient level, and the sealing and holding properties can be improved.

Projection 24 of ring-shaped member 2 outward in diameter
Is preferably formed exactly at a position corresponding to the skirt notch 11, and the tip (ridge line) 25 of the projection 24 is positioned at the center of the skirt notch 11 as shown in FIG. 2. It is preferably located on a radial line passing through.

In the specific example shown in the drawing, the radially outward projection 24 provided on the ring-shaped member 2 has a horizontal sectional shape close to an equilateral triangle, which is the simplest shape. The cross-sectional shape of the portion is not limited to this, and may have an arbitrary cross-sectional shape such as a trapezoid, a rectangle, a semicircle, a semiellipse, and a sine wave shape.

The thickness d of the ring-shaped member at the projection 24
₁ is relative to the thickness d ₀ of the ring-shaped member other than the protrusions.
The ratio d ₁ / d ₀ is generally between 1.2 and 1.8, in particular 1.3.
It is preferably in the range of 1.5 to 1.5. On the other hand, the thickness d
₀ varies depending on the type of resin material constituting the cap, the size of the cap, the size of the protrusion of the skirt, and the like, but generally ranges from 0.7 to 1.7 mm, particularly from 0.9 to 1.3 mm. Preferably, there is.

When the thickness ratio d ₁ / d ₀ is smaller than the above range or larger than the above range, it tends to be difficult to achieve both the seal holding property and the moldability (mold release property). On the other hand, if these characteristics are within the above range, it is possible to achieve both of these characteristics. The thickness d ₀ is the smaller than the above range, there is a tendency for the holding force is insufficient to the container mouth portion of the cap, whereas large as demolding than the above range tends to become difficult.

Further, an opening angle (an angle from the center) of the protrusion 24 of the ring-shaped member from one skirt to the other skirt.
theta _1, to the opening angle theta ₀ in outermost from one end edge of the cutout portion 11 of the skirt portion to the other edge, the ratio of θ _{1 /} θ ₀ is generally 1.5 to 3. 0, especially in the range of 1.8 to 2.5. On the other hand, the above θ
₀ varies depending on the type of the resin material constituting the cap, the size of the cap, the circumferential dimension of the skirt protrusion, and the like, but is generally preferably in the range of 2 to 10 °, particularly preferably 3 to 8 °. .

Regardless of whether the opening angle ratio θ ₁ / θ ₀ is smaller or larger than the above range, it tends to be difficult to achieve both the seal holding property and the moldability (mold release property). On the other hand, if they are within the above range, these characteristics can be compatible. Also, the opening angle θ
_{If 0} is smaller than the above range, the holding force on the container mouth tends to be excessive, and the easy-opening performance tends to be reduced, or the mold tends to be difficult to remove. There is a tendency that the holding power to the seal decreases and the sealing performance decreases.

In the cap of the present invention, as shown in FIG. 9, the ring-shaped member 2 serves as a gripping piece and is opened from the side of the connecting portion 14, so that the bridging portion 13 is broken. The ring-shaped member 2 is required to have a mechanical strength that can withstand the opening force. On the other hand, as already pointed out, when the cap is formed by injection molding, the ring-shaped member 2
In the part, the part corresponding to the skirt cutout part 11 becomes a resin welded part, and the mechanical strength of this part tends to be insufficient. In the cap of this type according to the present invention, as described above, since the projection 24 is formed in the radial direction at the position corresponding to the skirt cutout 11 of the ring-shaped member 2, the portion corresponding to the projection 24 is formed. However, as described above, the wall thickness is increased, the weld portion is reinforced, and the opening operation is performed without failure.

In the present invention, the opening tab 15 is provided on the outer periphery of the ring-shaped member 2. As shown in FIG. 5, the opening tab 15 is provided on the portion of the ring-shaped member 2 provided with the opening tab 15. The provision of the cutout portion 27 from the inner surface side of the ring-shaped member 2 further inside and below the ring-shaped member 2 facilitates the die cutting of the skirt protrusion (undercut portion) 7. Preferred. The opening tab 15 is provided so as to protrude radially outward from the ring-shaped member 2 in order to improve the engagement with the finger. However, when the tab is thickened, a skirt projection (underside) located inside the opening tab is provided. It becomes difficult to die-cut the cut portion 7. Opening tab 1
The notch 27 from the inner surface of the ring-shaped member 2 is provided inside the opening tab 15 and below the ring-shaped member 2 in the portion of the ring-shaped member 2 provided with 5. The portion 27 serves as a relief for the skirt projection (undercut portion) 7 when the die is cut, and the die can be easily cut.

In the cap of the present embodiment, a lower horizontal rib 28 and a large number of vertical ribs 2 are provided above the horizontal ribs at small circumferential intervals on the outer periphery of the opening tab 15.
9 is provided to reinforce the strength of the opening tab 15 and to clearly indicate the position thereof, to improve the hooking of the finger at the time of opening, and to facilitate the gripping by the finger.

The plurality of cutouts 11 extending in the axial direction provided on the skirt 4 of the cap body 1 allow the skirt 4 to spread radially outward when the plug is opened (in a state where the ring-shaped member 2 is removed). As a result, the engagement between the lower surface of the outer peripheral projection 6 of the container mouth and the inward projection 7 of the skirt is released, and the cap body 1 can be easily removed from the container mouth 5. The number of installations and the circumferential interval are appropriately determined from these viewpoints.

In the cap of the present invention, the skirt portion 4
Although the number of the notches 11 provided in the hole varies depending on the diameter of the cap and the like, generally, the number of the notches 11 is 2 to 2
It is preferable that the number is 0, especially 8 to 12.

By bringing the skirt portion 4 and the ring-shaped member 2 into close contact with each other at the cut surface 12, the cap body skirt portion 4 is loosely tightened by the ring-shaped member 2 at least in a plugged state, and the skirt portion 4 is moved outward. Is prevented from spreading to the outside, and reliable sealing performance with respect to the container mouth is maintained. In the case of the cap according to the invention in which the skirt 4 is provided with a notch 11 extending in the axial direction, this close contact is particularly important. That is, the notch 11 of the skirt portion 4 acts to weaken the engagement state between the lower surface of the projection 6 on the outer periphery of the container mouth and the projection 7 of the skirt portion 4. Acts, the engagement state can be made firm and reliable.

Further, a plurality of breakable bridging portions 13 for connecting the skirt portion 4 of the cap body and the ring-shaped member 2 and a non-breakable connecting portion 14 are provided below or above the cut surface 12. Therefore, the engraving of the cut surface 12 is
And the connecting portion 14 is prevented from being adversely affected. Further, even when plugging, the outer surface of the cap body skirt portion 4 and the inner surface of the ring-shaped member 2 are in close contact with each other at the cut surface 12, so that the bridging is easily broken. The external force is prevented from acting on the portion 13, and the bridging portion 13 is completely protected at the time of plugging.

In the present invention, the close contact state between the cap body skirt portion 4 and the ring-shaped member 2 through the cut surface and the formation of the bridging portion 13 and the connecting portion 14 are performed by integrally injecting or compressing both. The cutting is performed by making a cut between the two with a cutter or the like to separate the portion excluding the bridging portion 13 and the connecting portion 14. For this reason, the cap of the present invention has the advantages that it can be manufactured efficiently and in a short time using a normal mold including a core and a cavity, and that the accuracy of each part of the cap is high and the occurrence of defective products is small.

The number of the bridging portions 13 provided between the cap body skirt portion 4 and the ring-shaped member 2 is such that at least one skirt piece 4b between the adjacent notches 11, 11 and the ring-shaped member 2 are provided. It is preferable that they are connected via the bridging portion 13. In addition, the position where the bridging portion 13 is provided can also be changed in various ways. For example, as shown in FIG. 2, one can be provided at an intermediate position of the skirt piece 4b, or two can be provided at both ends of the skirt piece 4b. it can. In short, any structure may be used as long as breakage of the bridging portion is prevented at the time of tapping and breakage is easily performed at the time of opening, and the position and number thereof are not particularly limited. The cross-sectional area of the bridging portion 13 in the direction of the cut surface 12 is 0.1
To 0.8 mm ² , particularly preferably 0.2 to 0.4 mm ² .

In the cap of the present invention, it is desirable to form a small circular recess 30 in the center of the outer surface of the top surface 3 of the cap body. When the cap is manufactured by injection molding, a residue of the gate remains in the center of the outer surface of the top surface, which hinders the smooth flow of the cap, causes dust to be generated when the cap is moved and agitated, and causes a finger touch on the cap. May cause discomfort when touched,
If the small recess 30 is provided in the center of the outer surface of the top surface, the tip of the remaining gate can be stopped in the recess 30, and the above-mentioned disadvantage can be prevented.

As the resin used for molding the cap, various plastics such as low-, medium- or high-density polyethylene, linear low-density polyethylene, polypropylene,
Thermoplastic polyester, polyamide, styrene resin,
ABS resin and the like.

The plastic cap of the present invention is manufactured using the above-mentioned resin, usually by integrating the cap body and the ring-shaped member by injection molding, compression molding or the like.
The cut surface is usually formed by performing a cutting process after this molding step. The cutting surface (separation surface) between the skirt portion 4 and the peripheral ring 2 may be formed when the cap body is formed by injection molding, compression molding, or the like, but cutting is performed after the formation of the cap body. May be formed.

Many modifications are possible with the cap of the present invention. In the case of this embodiment, the inner plug 8 of the cap top surface 3 is formed integrally with the cap body, but this inner plug may be formed of a liner provided separately from the cap body. In this case, low density polyethylene, ethylene copolymer, various rubbers or thermoplastic elastomers, acrylic resin plastisol, vinyl chloride resin plastisol, or the like can be used.

Further, a gas barrier material can be provided on the inner top surface of the inner plug 8 by insert molding or the like, thereby preventing gas from permeating through the plastic cap wall and allowing the contents to pass through. Preservability can be improved. As a gas barrier material,
Examples include metal foils such as aluminum foil, ethylene-vinyl alcohol copolymer, vinyl chloride resin, vinylidene chloride resin, nylon resin, and gas barrier resins such as gas barrier polyester.

An oxygen-absorbing layer can be provided on the top surface in place of the gas barrier material or together with the gas barrier material. As the oxygen-absorbing layer, for example, a layer in which an iron-based oxygen absorbent is dispersed in a resin can be used.

[Embodiment 2] The basic structure of the cap shown in FIGS. 10, 11, 12, and 13 is the same as that shown in Embodiment 1. In this cap, on the inner surface of the top plate 3, a ring-shaped small protrusion 22 that engages with the outer peripheral surface of the container opening 15 is formed outside the inner plug 8 in the same manner as in the first embodiment. The ring-shaped small protrusion 21 that engages with the top surface of the container mouth used in the first embodiment is omitted. As shown in FIGS. 14 and 15, the cap has a straight short cylindrical portion 31 at the upper part of the outer periphery of the container mouth 5.
And a bulging portion 32 extending outward in the radial direction below the bulging portion 32. The small ring-shaped protruding portion 22 engages from the short cylindrical portion 31 of the container mouth to the base or corner of the bulging portion 32. Thereby, sealing is performed.

[Embodiment 3] The basic structure of the cap shown in FIGS. 16, 17, 18 and 19 is the same as that of Embodiment 1.
Is the same as that shown in FIG. In this cap, on the inner surface of the top plate portion 3, on the outer side of the inner plug 8, there is provided a smooth curved surface 33 which engages with the top surface or the outer peripheral corner surface of the container mouth.
Are formed, and the ring-shaped small protrusions 22 and the ring-shaped small protrusions 21 used in the first embodiment are omitted, and the simplest sealing structure is obtained. Curved surface 33
And the sealing engagement between the top surface or the outer peripheral corner surface of the container mouth,
This is performed by engaging the projection 7 of the skirt with the lower surface of the outer peripheral projection 6 of the container mouth. Also, in this cap, the break guide 16 is composed of a score as shown in FIG. The groove shape and dimensions of this score are almost the same as those described in the first embodiment.

[0077]

According to the present invention, A.I. B. a cap body having a projection formed on the inner surface of the skirt to engage with the outer periphery of the container mouth, and an inner plug provided on the inner surface of the top plate to be inserted into the container mouth; B. a continuous ring-shaped member provided to cover the outer surface of the skirt portion and having an opening tab on the outer periphery; A plurality of notches provided in the skirt portion of the cap body at intervals in the circumferential direction so as to extend in the axial direction; A connecting portion provided on the opposite side of the opening tab; F. a circumferential cut surface provided between the skirt portion and the ring-shaped member; In a cap comprising a plurality of breakable bridging portions connecting a skirt portion and a ring-shaped member, a break guide portion extending from both sides of the connecting portion to a top plate portion is formed, and a cap is formed on an outer side of an inner plug of the top plate portion. By forming a pair of scores connected to the breaking guide portion, the inner plug and the skirt portion with the projection are separated at the time of opening, and the cap is irreparably damaged, so that the cap is reliably and at first glance. Clear tamper-evident properties (TE) are obtained. In addition, this cap has the advantage that both reliable sealing performance and easy and reliable easy-opening performance are compatible, and is widely used for sealing by stoppering containers instead of the conventional metal crown. be able to. Further, in the present invention, since the radially outwardly projecting portion is provided at a position corresponding to the notch portion of the ring-shaped member, it is easy to die-cut the projecting portion (undercut portion) on the inner surface of the skirt portion. In addition, the holding force of the container opening at or near the cutout portion of the skirt is also maintained at a sufficient level, and the ring-shaped member used as the opening piece is given strength that is not defeated by the opening force. The operation and effect described above are achieved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of one embodiment of a cap of the present invention.

FIG. 2 is a bottom view of the cap of FIG. 1;

FIG. 3 is a front view of an opening tab of the cap of FIG. 1;

FIG. 4 is an enlarged sectional view of a gate portion of the cap of FIG. 1;

FIG. 5 is an enlarged cross-sectional view showing the cap of FIG. 1 in a BB ′ cross-section of FIG. 2;

FIG. 6 is an enlarged cross-sectional view showing the cap of FIG. 1 in a cross section taken along the line CC ′ of FIG. 2;

FIG. 7 is a cross-sectional view showing a state in which the cap of FIG. 1 is attached to a container mouth and a cross section taken along the line BB ′ of FIG. 2;

8 is a cross-sectional view showing a state in which the cap of FIG. 1 is attached to a container mouth and a cross section taken along the line CC ′ of FIG. 2;

FIG. 9 is an explanatory view showing an opened state of the cap of FIG. 1;

FIG. 10 is a partial cross-sectional side view of another embodiment of the cap of the present invention.

FIG. 11 is a bottom view of the cap of FIG. 10;

FIG. 12 is an enlarged cross-sectional view showing the cap of FIG. 10 along the line BB ′ of FIG. 11;

FIG. 13 is an enlarged cross-sectional view showing the cap of FIG. 10 in a cross section taken along the line CC ′ of FIG. 11;

14 is a cross-sectional view showing a state in which the cap of FIG. 10 is attached to a container mouth and a cross section taken along line BB ′ of FIG. 11;

FIG. 15 is a cross-sectional view showing a state in which the cap of FIG. 10 is attached to a container mouth and a cross section taken along the line CC ′ of FIG. 11;

FIG. 16 is a side sectional view of still another embodiment of the cap of the present invention.

FIG. 17 is a bottom view of the cap of FIG.

FIG. 18 is an enlarged cross-sectional view showing the cap of FIG. 16 in a BB ′ cross-section of FIG. 17;

19 is an enlarged cross-sectional view showing the cap of FIG. 16 in a cross section taken along the line CC ′ of FIG. 17;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap main body 2 Ring-shaped member 3 Top plate (top surface) part 4 Skirt part 5 Container mouth part 6 Container outer peripheral concave part 7 Projection part 8 Inner ring 9 Container mouth inner peripheral surface 10 Inner ring protrusion part 11 Notch 12 Cut surface 13 Bridge Entangled part 14 Connection part 15 Unsealing tab 16 Break guide part 17 Top plate score 18 Container mouth top surface 19 Score tearing start end 20 Score tearing end end 21 Top surface engaging small protrusion 22 Outer surface engaging Small protrusion 23 Groove 24 Ring-shaped member protrusion 27 Opening tab notch

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuo Kumada 2-12 Nagatoro, Hiratsuka-shi, Kanagawa F-term in Hiratsuka Plant, Japan Crown Cork Co., Ltd. 3E084 AA04 AA12 BA01 CA01 CB01 CC03 DA01 DB01 DB09 DC03 EA04 EC03 FA09 FC04 GB17 LA02 LA06 LB02

Claims (8)

[Claims] 1. A top plate portion and a skirt portion, wherein a projection engaging with a container mouth is formed on an inner surface of the skirt, and an inner plug inserted into the container mouth is provided on an inner surface of the top plate. A cap body, a continuous ring-shaped member integrally provided with the cap body so as to cover an outer surface of a skirt portion of the cap body, and having an opening tab on an outer periphery;
A plurality of notches provided in the skirt portion of the cap body at intervals in the circumferential direction so as to extend in the axial direction, and a connection between the skirt portion and a continuous ring-shaped member provided on the opposite side of the opening tab; Section, a circumferential or arc-shaped cut surface provided between the skirt portion and the ring-shaped member, and a plurality of breakable bridges connecting the skirt portion and the ring-shaped member below or above the cut surface. A cap comprising a pair of scores provided outside the inner plug of the top plate portion and connected to the break guide portion, the breaking guide portion extending from both sides of the entanglement portion and the connecting portion to the top plate portion. 2. The cap according to claim 1, wherein each of the scores is provided in a range where an opening angle from the center is 30 to 120 °. 3. A notch portion is located on both sides of the connecting portion, and an upper edge of the notching portion opens to the skirt portion above the ring-shaped member, and is cut from the notches on both sides of the connecting portion. The cap according to claim 1, wherein the guide portion extends toward the top plate portion. 4. The cap according to claim 1, wherein the break guide is a slit or a score. 5. The cap according to claim 1, wherein the score comprises a groove which is opened on the inner surface of the top plate portion facing the top surface of the container mouth. 6. The score is the thickness t _{1 at the} groove bottom.
6. The cap according to claim 5, wherein the cap comprises a groove having a diameter of 0.2 to 0.7 mm. 7. An inner surface of the top plate portion is formed with a small ring-shaped projection on the outer surface of the inner plug, which is engaged with a top surface, an outer peripheral side corner portion, or an outer peripheral surface of the container mouth. The cap according to any one of claims 1 to 6, wherein 8. The cap according to claim 1, wherein a projection outward in a radial direction is formed on the ring-shaped member at a position corresponding to the notch.