JP4116147B2 - Can lid without score - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a can lid, and more particularly to a can lid that is provided at an opening of a beverage can and has no score for forming a drinking mouth portion.
[0002]
[Prior art]
Conventionally, metal cans represented by aluminum cans are widely used as cans for various beverages. The can lid of such a beverage can is fixed to the can mouth portion by winding, the drinking mouth portion is partitioned by a score of a predetermined shape, and a metal tab is formed in the portion partitioned by the score Most are riveted structures.
That is, when the tab is lifted by hand or pushed into the can, the score is broken to form a drinking mouth and drink the beverage in the can.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventionally known can lid, when the score is broken to form a drinking mouth, there is a problem that metal powder such as aluminum is generated, and this metal powder falls into the can and is mixed. It is not desirable for hygiene. In particular, when the can lid is formed of a soft material such as aluminum, the tendency of metal powder to be generated is large, which is not preferable for hygiene purposes.
Further, when the drinking mouth is formed by breaking the score, a sharp cut is formed, which may cause discomfort when the score is broken or when drinking.
[0004]
Accordingly, an object of the present invention is to provide a can lid which can form a drinking mouth without providing a score, and can effectively prevent generation of metal powder due to score breakage and formation of a sharp cut. .
[0005]
[Means for Solving the Problems]
According to the present invention, a plate-shaped metal lid body that is fastened and fixed to the can mouth portion and provided with a drinking mouth portion, a resin stopper for closing the drinking mouth portion of the lid body, and the resin It consists of a resin ring holder that is detachably attached to the stopper,
A curl portion is formed at the periphery of the drinking mouth of the metal lid,
The resin plug body includes a flat plate portion and a circumferential protrusion formed on the upper surface of the flat plate portion and inside the outer peripheral edge of the flat plate portion. Has a flange part,
A locking ridge is formed on the outer surface of the upper end of the circumferential protrusion, and a plurality of notches extending downward are formed at regular intervals in the circumferential direction at the upper end of the circumferential protrusion.
The resin plug is fitted into the drinking port portion from below so that the curled portion and the outer surface of the circumferential protrusion face each other, and in this state, the curled portion and the locking protrusion are engaged, The curled portion is held between the locking protrusion and the upper surface of the flange portion of the flat plate portion,
The ring holder includes a substrate, a peripheral side wall rising from the outer peripheral edge of the substrate, and a grip portion provided on the upper surface of the substrate, and the ring holder is in close contact with the outer surface of the peripheral side wall and the inner surface of the peripheral protrusion. Thus, a can lid is provided which is detachably fitted into a circumferential projection of the resin plug.
[0006]
In the can lid of the present invention, the resin stopper is fitted and fixed to a drinking mouth portion formed in advance on the metal lid body, and the drinking mouth portion is easily opened by pressing down to drink. be able to. Therefore, since the drinking mouth is not formed by the breaking of the score, there is no possibility of producing metal powder such as aluminum, which is extremely excellent in terms of hygiene.
In addition, since the curl portion is formed at the periphery of the drinking mouth portion formed on the metal lid, there is no sharp portion, so there is no possibility of causing discomfort to the general user at the time of drinking etc. Absent.
Further, a ring holder is fitted in the circumferential projection of the resin plug fitted in the drinking mouth, and this circumferential projection is pressed outward by the circumferential side wall of the ring holder. Is pressed against the curled part. As a result, the resin plug is firmly fitted and fixed to the drinking mouth, and sufficient sealing performance is secured. In this case, the opening of the drinking mouth part by pushing in the resin plug is performed after pulling the grip part and removing the ring holder.
[0007]
In the present invention, the upper end of the circumferential protrusion of the resin plug body has a locking protrusion that engages with the curl portion in a fitted state, and a plurality of notches that extend downward at intervals in the circumferential direction. It is important that the part is formed. That is, when the drinking mouth is opened by pushing the resin stopper, the drinking mouth is closed again by this stopper when there is a large amount of beverage in the can or when the can is tilted for drinking. There is a fear. However, if the locking ridge and the notch are formed as described above, the upper end of the locking ridge is brought into contact with the curled portion, so that the fitting of the outer plug body into the drinking mouth portion is prevented, And the flow path of the drink which passes a drinking mouth part by a notch part is ensured. Therefore, drinking can be performed without any inconvenience.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below based on specific examples shown in the accompanying drawings.
1 is a side sectional view showing a can lid of the present invention together with a can mouth portion, FIG. 2 is a plan view thereof, and FIG. 3 is a drinking mouth in the can lid of FIG. FIG. 4 is a side cross-sectional view showing a state when the portion is opened and drinking, and FIG. 4 is an enlarged view of a fitting portion between the resin stopper and the curl portion of the can lid of FIG.
[0009]
1 and 2, the can lid includes a metal lid 1, a resin stopper 2, and a resin ring holder 3.
[0010]
The metal lid 1 is fastened and fixed to the opening of the metal can 50, and further includes a drinking portion 5 formed in a portion near the peripheral edge. As shown in the figure, a curling portion 6 is formed on the peripheral edge of the drinking mouth portion 5 by curling.
[0011]
The resin plug 2 is formed of a flat plate portion 10 and a circumferential protrusion 11 formed on the upper surface of the flat plate portion 10. Further, a flange portion 12 is formed on the outer portion of the circumferential projection 11 of the flat plate portion 10, and a band portion 13 extends from the flange portion 12, and the tip portion of the band portion 13 is formed of the metal lid 1. It is fixed with a rivet 16 on the back side. That is, the resin plug body 2 has a structure that is swingably supported on the back surface of the metal lid body 1.
[0012]
The resin ring holder 3 includes a substrate 20, a peripheral side wall 21 rising from the outer periphery of the substrate, and a gripping portion (pull ring) 22 provided on the upper surface of the substrate.
[0013]
As is apparent from FIG. 1, the resin plug 2 is fitted into the drinking mouth 5 of the metal lid 1 from below, and the ring holder 3 is a resin stopper fitted into the drinking mouth 5. The two circumferential projections 11 are fitted. That is, when opening the mouthpiece 5, the pull ring 22 is pulled by hand to remove the ring holder 3 from the circumferential protrusion 11, and then the resin plug 2 is pushed in.
[0014]
In the present invention, a locking protrusion 30 is provided on the outer surface of the upper end portion of the circumferential projection 11 of the resin plug body 2, and further, a notch portion 31 extending downward is provided at the upper end portion. Are formed at appropriate intervals in the circumferential direction.
Referring to FIG. 3, the outer diameter D of the locking protrusion 30 is set to be slightly larger than the inner diameter d of the curled portion 6. Therefore, in the state where the resin plug body 2 is fitted in the drinking mouth portion 5 as shown in FIG. 1, the curl portion 6 and the locking protrusion 30 are engaged with each other. It is effectively prevented from falling into 50.
[0015]
Further, as shown in FIG. 3, in the state where the resin plug body 2 is pushed down and the drinking mouth portion 5 is opened, the metal lid body 1 is swingably supported. When there is a large amount of beverage in the can 50 or when the can 50 is tilted for drinking, the drinking mouth portion 5 may be closed again due to the swinging of the plug body 2. However, due to the presence of the locking ridge 30 as described above, the locking ridge 30 abuts on the lower side of the curled portion 6, so that the trouble of entering the drinking mouth portion 5 is effectively prevented. . Further, since a notch 31 is formed at the upper end of the circumferential protrusion 11 on which the locking protrusion 30 is formed, the locking protrusion 30 is in contact with the lower side of the curled portion 6. However, since the beverage flows through the notch 31, it can be drunk as it is.
[0016]
The distance between the lower end of the notch 31 and the upper surface of the flat plate portion 10 needs to be at least as long as the axial length of the curled portion 6. This is because if the cutout portion 31 extends to the vicinity of the upper surface of the flat plate portion 10, the sealing performance when the resin stopper 2 is fitted into the drinking mouth portion 5 may be impaired.
[0017]
In addition, with reference to FIG. 4 showing an enlarged fitting portion between the resin plug body 2 and the curled portion 6, in a state where the resinous plug body 2 is fitted in the drinking mouth portion 5, The engaging protrusion 30 is engaged with the lower side of the upper end of the circumferential protrusion 11 described above, and the curled portion 6 is sandwiched between the engaging protrusion 30 and the flange portion 12. Further, as shown in FIG. 4, it is preferable to form a concave portion 40 having a shape along the outer surface of the curled portion 6 from the circumferential protrusion 11 to the flange portion 12. As a result, the locking protrusion 30 and the curled portion 6 of the plug body 2 fitted in the drinking mouth portion 5 are firmly engaged, so that the plug body 2 is stably held and sufficient sealing performance is secured. can do.
[0018]
In addition, it is preferable to form a plurality of minute protrusions 41 on the recess 40, particularly on the surface located on the flange portion 12 side. By forming such minute projections 41, stress concentrates on the curled portion 6 and the tips of the minute projections 41, so that a sufficiently high sealing performance can be ensured. In particular, in the case where the beverage in the can has an internal pressure like carbonated beverages such as cola, it is possible to ensure remarkably high sealing performance. Further, in place of such a small protrusion 41, a sealing material made of a soft resin separate from the plug body 2 can be provided.
[0019]
Further, in the present invention, it is preferable that the curled portion 6 is curled upward as clearly shown particularly in FIG. This is because the tip portion 6a to which the coating material is not applied may come into contact with the can content liquid and change the content liquid.
Further, it is desirable that the tip end portion 6a of the curled portion 6 is rounded inward so as not to be exposed to the outside. This is because if the tip portion 6a is exposed to the outside, the user may feel uncomfortable during drinking.
[0020]
Further, according to the present invention, as shown in FIG. 1, the ring holder 3 is fitted into the circumferential protrusion 11 of the resin stopper 2 fitted into the drinking mouth portion 5. That is, the outer diameter of the circumferential side wall 21 of the ring holder 3 is set to be equal to or slightly larger than the inner diameter of the circumferential protrusion 11. Therefore, when the ring holder 3 is fitted into the circumferential projection 11, the outer surface of the circumferential side wall 21 and the inner surface of the circumferential projection 11 are in close contact, and the circumferential projection 11 is slightly expanded outward. As a result, the outer surface of the circumferential protrusion 11 is pressed against the curled portion 6 and the resin stopper 2 is firmly fixed, and at the same time, the sealing performance is further improved.
[0021]
In order to manufacture the can lid of the present invention, the resin stopper 2 and the ring holder 3 are formed by injection molding or the like, and the metal stopper 1 is formed by punching and curling the resin stopper 2. Rivet to Next, the resin stopper 2 is pushed up and fitted into the drinking mouth 5, and then easily manufactured by fitting the ring holder 3 into the circumferential protrusion 11 of the resin stopper 2 to open the beverage can. The metal lid 1 is practically provided by being fastened and fixed to the part. Further, after the ring holder 3 is fitted into the plug body 2, the ring holder-attached plug body can be fitted into the drinking mouth portion 5 of the metal lid 1.
[0022]
In this can lid, the material for forming the resin stopper 2 and the ring holder 3 is not limited to this. For example, polyethylene, polypropylene, propylene-ethylene copolymer, propylene-butene 1 copolymer, etc. Various plastics such as olefin resin, acrylonitrile-styrene-butadiene (ABS) resin, impact-resistant styrene resin, acrylic resin, and nylon resin are used, and high-density polyethylene, polypropylene, and the like are particularly preferably used.
Moreover, as a metal raw material which forms the metal-made cover body 1, light metals, such as surface untreated steel (black plate), surface treated steel, and aluminum, are used suitably. As surface-treated steel, chemical treatment such as phosphoric acid treatment and chromic acid treatment, chemical treatment such as electrolytic chromic acid treatment, electrolytic plating treatment such as electrolytic tin plating, electrolytic galvanization and electrolytic chrome plating, molten aluminum And those subjected to hot dip plating such as hot dip tin plating and hot dip tin plating. Of these, aluminum and aluminum alloys are particularly suitable. The inner surface of the metal lid 1 is preferably painted with an appropriate protective paint.
[0023]
In the above-described specific example, the band portion 13 extending from the flange portion 12 is fixed to the back surface of the metal lid 1 with the rivet 16, but it is not always necessary to fix the band portion 13 with the rivet or the like. . However, when the plug 2 is not fixed to the lid 1, the fleet may be reversed when drinking, and therefore it is preferable to provide a plurality of protrusions on the outer peripheral portion of the lower surface of the flange portion 12. Of course, it is necessary to set a virtual circle formed by the outermost peripheral portion of the plurality of protrusions to be larger than the inner diameter of the curled portion.
[0024]
【The invention's effect】
In the can lid of the present invention, the drinking mouth is formed in advance on the metal lid, and the score is not broken in order to form the drinking mouth. Therefore, there is no generation of metal powder due to score breakage and it is extremely hygienic.
Further, since the curled portion is formed at the peripheral portion of the drinking mouth that is formed in advance, the sharp metal end portion is not formed, and there is no possibility that the user may feel uncomfortable.
Further, a resin stopper is fitted and fixed to the drinking hole formed in advance, and the drinking hole can be easily opened by pushing the stopper.
The can lid of the present invention is particularly useful as a can lid for aluminum beverage cans filled with carbonated beverages such as cola.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a can lid of the present invention together with a can mouth portion.
2 is a plan view of the can lid of FIG. 1. FIG.
3 is a side cross-sectional view showing a state when the resin lid is pushed down to open the drinking mouth part and drink in the can lid of FIG. 1. FIG.
4 is an enlarged view showing a fitting portion between a resin plug body and a curled portion of the can lid of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Metal lid body 2 ... Resin plug body 3 ... Ring holder 5 ... Drinking mouth part 6 ... Curling part 10 ... Flat plate part 11 ... Circumferential protrusion 12 ... Flange part 13 ... Band part 20 ... Substrate 21 ... Circumferential side wall 30 ... Locking protrusion 31 ... Notch 40 ... Recess 41 ... Micro projection 50 ... Metal can

Claims (3)

A plate-shaped metal lid that is fastened to the can mouth portion and provided with a drinking mouth portion, a resin plug body for closing the drinking mouth portion of the lid body, and detachable from the resin stopper body It consists of a resin ring holder provided,
A curl portion is formed at the periphery of the drinking mouth of the metal lid,
The resin plug body includes a flat plate portion and a circumferential protrusion formed on the upper surface of the flat plate portion and inside the outer peripheral edge of the flat plate portion. Has a flange part,
A locking ridge is formed on the outer surface of the upper end of the circumferential protrusion, and a plurality of notches extending downward are formed at regular intervals in the circumferential direction at the upper end of the circumferential protrusion.
The resin plug is fitted into the drinking port portion from below so that the curled portion and the outer surface of the circumferential protrusion face each other, and in this state, the curled portion and the locking protrusion are engaged, The curled portion is held between the locking protrusion and the upper surface of the flange portion of the flat plate portion,
The ring holder is composed of a substrate, a peripheral side wall rising from the outer periphery of the substrate, and a grip portion provided on the upper surface of the substrate. The ring holder is in close contact with the outer surface of the peripheral side wall and the inner surface of the peripheral protrusion. Thus, the can lid is detachably fitted in the circumferential protrusion of the resin plug. 2. The can lid according to claim 1, wherein the flat plate portion of the resin stopper is swingably held via a band portion riveted to the back surface of the metal lid. The can lid according to claim 1, wherein a concave portion having a curved shape along the curled portion is formed from the circumferential protrusion to the flange portion.

Images