JP3492007B2 - cap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap having an excellent opening property, and more particularly to a cap which can be easily and surely opened and which also has a tamper evidence property.

[0002]

2. Description of the Related Art A resin cap can be integrally molded, has excellent moldability, and is excellent in flexibility, so that it can be fixed to a container mouth by a tapping operation, and it has various forms in the past. Widely used. Excellent in sealing performance,
There is also known a resin cap having an excellent opening property which can be easily removed from the container mouth without using a tool. For example, Japanese Patent Publication No. 46-30352 discloses a sealing skirt and a lower outer periphery. It consisted of a hook ring provided and a retaining ring with a notch, and the hook ring was pulled to break the weakened part. A cap is described that opens with the retaining ring of the part away from the mouth of the bottle.

Further, Japanese Patent Publication No. 53-1712 discloses that
It consists of a cap member and a band-shaped body that surrounds the annular side wall of the cap member and is fixed to the cap member at the web and the end portion.The band-shaped body is grasped and the web is broken, and it is bent upward beyond the top of the cap member. , A cap that is opened by pulling the band-shaped body to lift the cap member itself is described.

[0004]

[Problems to be Solved by the Invention] These caps are
It does not require a tool such as a bottle opener to open it, and its openability is remarkably improved compared to conventional crowns, but in the former it is necessary to bend the cap and destroy the cap. In that case, a considerably large force was required, and the opening property was not yet satisfactory. Also, with the latter cap, since the cap member that fits tightly into the bottle mouth is lifted and opened with a strip without breaking, a large force is still required for opening, and the strip may be damaged before opening. There is also a risk that it may end up being unsatisfactory in terms of openability. Therefore, an object of the present invention is to provide a cap that does not require a large force at the time of opening and can be opened easily and surely.

[0005]

According to the present invention, there is provided a cap body having a top plate portion and a skirt portion, and an inner surface of the skirt portion provided with a protrusion engaging with a container mouth portion, and a skirt portion of the cap body. In a resin cap composed of a ring-shaped side wall integrally provided on the cap body so as to cover an outer surface, a plurality of weakening portions extending in the axial direction are provided on a skirt portion of the cap body, and the cap body and the The ring-shaped side wall is integrally molded through the connecting part and a plurality of rupturable bridging parts, and the outer surface of the cap body skirt excluding the connecting part and the bridging part is completely separated from the inner surface of the ring-shaped side wall. A cap is provided which is characterized by a close but tight fit.

In the present invention, the outer surface of the skirt portion of the cap body and the inner surface of the ring-shaped side wall are completely integrally formed at the beginning of molding, and no clear boundary is provided between the cap body and the ring-shaped side wall. After forming the cap, the cap body skirt outer surface and the ring-shaped side wall inner surface are formed, except for the portions to be the bridging portion and the connecting portion.
It is preferable to separate the skirt portion and the ring-shaped side wall by cutting with a cutter or the like.

[0007]

The cap of the present invention comprises a cap body skirt portion and a ring-shaped side wall provided so as to cover the outer surface of the skirt portion. By lifting the ring-shaped side wall upward, the cap body and the ring-shaped side wall are separated. The connecting bridge portion is cut. Since the cap body skirt has a weakened portion, if the ring-shaped side wall is lifted up and is no longer in contact with the cap body, the cap body can be easily detached from the container mouth, and it is extremely possible without using a tool. It can be opened easily.

In the cap of the present invention, the outer surface of the skirt portion of the cap body and the inner surface of the ring-shaped side wall portion are substantially separated from each other, but it is an important feature that the cap body is kept in close contact before opening. Before opening, the ring-shaped side wall is in close contact with the cap body, and no gap is formed between them. Therefore, even if the cap body skirt portion is provided with the weakened portion, the ring-shaped side wall fixes the cap body from the outside and prevents the cap body from expanding in the radial direction, and thus does not affect the sealing performance of the container. is there. Therefore, even if the cap of the present invention is subjected to a capping operation, the cap body is fixed by the ring-shaped side wall and does not expand in the radial direction, and the engagement between the container mouth portion and the cap can be strengthened. . Further, even if the weakened portion is formed by the score, the score is not broken.

The cap of the present invention is first formed as a primary molding in which the cap body and the ring-shaped side wall are completely integrated without a clear boundary, and then the ring-shaped side wall separated from the cap body is separated from the primary molding. To be formed, a notch is formed so as to form a portion that should become the outer surface of the skirt portion and the inner surface of the ring-shaped side wall. This cut is a connecting part (a part that does not make a cut) and a bridging part that can be broken (a part that connects the ring-shaped side wall to the cap body)
In the final molded product, the cap body and the ring-shaped side wall maintain their integrity with the cap body at these portions.

Moreover, since the outer surface of the skirt portion and the inner surface of the ring-shaped side wall are not notched as in the case where a groove is formed, they are merely notched so that they are completely separated. Nevertheless, it is possible to maintain a close contact with each other. Furthermore, in the cap of the present invention, when the ring-shaped side wall is pulled up for opening, the bridging portion connecting the ring-shaped side wall and the cap body is broken,
It cannot be resealed and has tamper-evidence that it can be seen at a glance that it has been opened.

[0011]

The present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 showing an example of the present invention, (A) of FIG. 1 is a side view of a state in which a cap is fitted into a container mouth, (B) is a plan view of the cap, and (C) is a bottom surface of the cap. Each of the figures is shown, and FIG. 2 is a cross-sectional view of a main part (a part in which a slit is provided in the cap body) in a state where the cap is fitted in the container mouth part. FIG. 3 is a diagram for explaining an opening operation of the cap shown in FIG. Whole 1
The cap of the present invention, which is represented by, is generally composed of a cap body 2 and a ring-shaped side wall 3. The cap body 2 comprises a top plate portion 4 and a skirt portion 5. The inner surface of the top plate portion 4 is an inner ring 6 for maintaining hermeticity, and the inner surface of the skirt portion 5 is fitted with a bead 8 of a container mouth portion 7. The projection 9 for fixing the cap and the skirt portion 5 are provided with a plurality of slits 10 extending upward from the lower end.

The skirt portion 5 of the cap body 2 is formed with a connecting portion 11 in which the ring-shaped side wall 3 is completely integrated. The connecting portion 11 prevents the ring-shaped side wall from being completely separated from the cap main body, and has a role of a fulcrum in the opening operation described later. Further, a plurality of bridging portions 12 that connect the ring-shaped side wall 3 to the cap body 2 in a breakable manner are provided at intervals. The outer surface of the cap body skirt portion 5 and the inner surface of the ring-shaped side wall 3 are in close contact with each other, but as shown in FIG.
Separated in 3. The cut surface 13 is cut and divided so as to penetrate to the lower portion in the circumferential direction except the connecting portion 11 and in the axial direction except the bridge portion 12. In this cut surface 13, the inner surface of the ring-shaped side wall 3 and the outer surface of the skirt are in close contact with each other, and no gap is formed.

On the other hand, since the ring-shaped side wall 3 is fixed so as to restrain the skirt portion 5, the bead 8 of the container mouth portion 7 is fixed.
It is possible to strengthen the engagement between the protrusion 9 of the cap and the protrusion 9. Portion 14 of the ring-shaped side wall 3 facing the connecting portion 11
(Hereinafter, it is referred to as an opening start portion) has a shape that projects slightly above other portions, and it is understood that the lower end of this portion should be grasped as a clue when opening.

To open the cap of the present invention, first, as shown in FIG. 3, the opening start portion 14 is pulled up in the direction of arrow A in FIG. When the ring-shaped side wall is pulled upward, rupture starts from the bridging portion 12 near the opening start portion,
When the breaking of the bridging portion 12 is completed up to the vicinity of the connecting portion 11, the division between the ring-shaped side wall 3 and the cap body 2 does not proceed any further. At this point, the cap main body can be removed from the container opening by pulling the opening start portion 14 in the direction of arrow B in FIG. As described above, since the skirt portion 5 is restrained from the surroundings by the ring-shaped side wall 3,
Even if the skirt portion 5 is provided with a plurality of slits 10 extending upward from the lower end, it does not have any influence on the fitting of the cap. However, when the ring-shaped side wall 3 is removed, the ring-shaped side wall 3 causes The restraint on the skirt portion is released, and the skirt portion 5 can be expanded in the radial direction. For this reason, the cap 1 can be easily removed from the container opening 7 by pulling the ring-shaped side wall 3.

To mold the cap of the present invention, first, the cap body and the ring-shaped side wall are completely integrally molded by injection molding, compression molding or the like. At this time, slits and the like are simultaneously formed in the cap body. Next, a cut is made from the direction of the top plate of the cap with a cutter or the like so as to form the outer surface of the skirt and the inner surface of the ring-shaped side wall (cut surface 13 shown in FIG. 2). In the axial direction, it is easy to open by notching through the part that forms the bridge part, penetrating the other parts, and making a notch so as to leave the connecting part in the circumferential direction. However, the integrity of the ring-shaped side wall and the cap body is maintained before unsealing, and the ring-shaped side wall is in close contact with the skirt and is restrained so that the skirt does not expand in the radial direction even though they are separated. Is possible.

The cap of the present invention is not limited to the examples described in the above embodiments, but various modifications can be made. For example, the weakened portion provided on the cap body skirt portion is not limited to the slits that are completely broken as described above, and may be a score, a combination of slits and scores, or any other member that can be easily broken when opened. be able to. As the resin used for molding, various plastics such as high-density polyethylene, polypropylene,
Thermoplastic polyester, polyamide, styrene resin,
It can be made of ABS resin or the like. Further, in order to provide the container with hermeticity, a conventionally known liner made of an olefin resin, vinyl chloride plastisol, or the like is used on the inner surface of the top plate of the cap body.

[0017]

According to the present invention, the cap body and the ring-shaped side wall, which are completely integrally molded, are separated by making a notch after molding, and the cap body skirt outer surface except for the connecting portion and the bridging portion. The inner surface of the ring-shaped side wall and the inner surface of the ring-shaped side wall are substantially separated from each other, but by completely adhering to each other before opening, it is possible to strengthen the engagement between the bead of the container mouth and the protrusion of the cap. Moreover, it is possible to provide a cap that can be easily and surely opened without using a tool and that also exhibits TE property.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a cap of the present invention.

FIG. 2 is a cross-sectional view of a main part of the cap of the present invention shown in FIG.

FIG. 3 is a view for explaining an opening operation of the cap of the present invention shown in FIG.

[Explanation of sign]

1 cap 2 cap body 3 Ring-shaped side wall 5 Skirt part 10 slits 11 Connection 12 Bridge section 13 cut surface

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 41/48 B65D 41/60

Claims (3)

(57) [Claims] 1. A cap body comprising a top plate portion and a skirt portion, and a projection provided on the inner surface of the skirt for engaging with a container mouth, and a cap body integrated with the cap body so as to cover the outer surface of the skirt portion. In the resin cap including the ring-shaped side wall provided in the, the skirt portion of the cap body is provided with a plurality of weakened portions extending in the axial direction, and the cap body and the ring-shaped side wall have a connecting portion and a plurality of weakened portions. The outer surface of the cap body skirt excluding the connecting portion and the bridging portion and the inner surface of the ring-shaped side wall are completely separated but are in close contact with each other, while being integrally molded via the rupturable bridging portion. Characteristic cap. 2. The outer surface of the skirt portion of the cap body and the inner surface of the ring-shaped side wall are formed by making a cut after injection or compression molding and separating the portion excluding the bridging portion and the connecting portion. The cap described in 1. 3. The cap according to claim 1, wherein the weakened portion is a slit.