JP2000302146A - Cap made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap in which sure tamper evidence(TE) is obtained and, furthermore, reliable tight-seal performance and simple, sure easy-unseal performance are compatible. SOLUTION: A cap 1 comprises a continuous ringlike member provided integrally on a cap main body so as to cover the external face of the skirt 5 of the cap main body 2 and having on its periphery a tab 16 for unsealing, notches 12 provided in the skirt of the cap main body at intervals in its circumferential direction so as to extend in its axial direction, and a connecting part 15 for the continuous ringlike member and skirt provided opposite the tab for unsealing. The cap 1 further comprises a cut face 13 in the form of a circle or circular arc provided between the skirt and ringlike member, and breakable bridges 14 connecting in positions higher or lower than the cut face the skirt and ringlike member. At least the ringlike member 3 of the cap is colored, and by whitening the ringlike member in a position continuing to the connecting part, the evidence of unsealing is shown.

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 the color change of cap members as well as the breaking of bridges. It can be seen at a glance whether or not it has been subjected to the opening operation due to the change, and the reliable tamper-evident property (TE property), the reliable sealing performance and the easy and reliable easy opening performance are compatible. About the cap.

[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 prior art 2, the ring-shaped member protects the bridging portion to facilitate the plugging operation, and the notch is provided by breaking the bridging portion to remove the ring-shaped member. The skirt part spreads outward and can be easily opened by hand, and it also has a tamper-evident function. There is still room for improvement.

That is, when the ring-shaped member is pulled upward to break the bridging portion to perform the opening operation, and then the cap is attached to the container again and the ring-shaped member is returned to the original state, it is not necessarily required. There is a problem that it cannot be shown that the package has been clearly opened. In addition, the thickness of the ring-shaped member has a certain range with respect to the compatibility between the seal holding property and the moldability. If the thickness is too large, it is difficult to remove the protrusion (undercut) on the inner surface of the skirt. On the other hand, if the thickness of the ring-shaped member is too thin, the force for holding the container mouth portion by the projections becomes insufficient, and the sealing and holding properties tend to be insufficient. In this manner, the thickness of the ring-shaped member is determined to be within a certain range. In this case, the notch of the skirt has a notch, and the protrusion is also notched. However, there is a problem that the holding force of the container mouth tends to be insufficient.

Accordingly, it is an object of the present invention to overcome the problems of the prior art described above and to replace resin caps, especially conventional metal crowns, having a combination of improved tamper-evident properties, sealing reliability and openability. It can be used for stoppering the container mouth, and it can be seen at a glance that the cap has been subjected to the opening operation by the change in the color of the cap member along with the breakage of the bridging part, and a reliable tamper-evident property ( T
An object of the present invention is to provide a cap that achieves E) and has both a reliable sealing performance and an easy and reliable easy opening performance.

[0009]

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 a sealing engagement portion, 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 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 From a plurality of breakable bridging portions connecting the skirt portion and the ring-shaped member at a lower side or an upper side of the cut surface in a circumferential or arc shape provided between the portion and the ring-shaped member. Consisting cap There are, at least the ring-shaped member of the cap is colored, resin cap, characterized in that the tamper-evident by whitening of the ring-shaped member at a position connecting to the connecting portion is to be performed is provided.

[0010]

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 engaging with the container mouth portion is formed on the inner surface of the skirt portion, and a sealing engagement portion with the container mouth portion is provided 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. And a functional feature that, at least when the ring-shaped member is colored and subjected to an opening operation, the position connected to the connecting portion of the ring-shaped member is whitened. It has an important feature in that it has features.

Further, in the cap of the present invention, G. the sealing engagement portion on the inner surface of the top plate is an inner plug inserted into the container mouth; It is particularly preferable that the ring-shaped member is provided with a projection projecting radially outward at a position corresponding to the notch provided in the skirt.

In the cap body of the present invention, an inner plug engaged with the inner peripheral side of the container opening is formed as a sealing engagement portion with the container opening provided on the inner surface of the top plate portion, so that the inner periphery of the container opening is formed. Side, while the inner surface of the skirt is formed with a projection (undercut) that engages the outer periphery of the container mouth, and a combination of these secures the cap to the container mouth. And hermetically sealed.

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. Thereby, the cap body can be easily removed from the container mouth.

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 tightened 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 expand in a radially outward direction, and the connection portion side The cap body can easily be detached from the container mouth, and can be easily opened without using any tools.

If the opening has already been performed,
Since the bridging portion has been broken and the ring-shaped member can be freely moved up and down, it can be known that this has already been opened.In the present invention, however, in order to further improve the tamper-evident property, As described above, when the colored ring-shaped member is subjected to an opening operation, it is whitened to clearly show that the member has already been opened at a glance, thereby ensuring a reliable tamper-evident property (TE).
Gender).

That is, in the present invention, since the connecting portion between the skirt portion and the continuous ring-shaped member is provided on the side opposite to the opening tab, the connecting portion becomes the fulcrum by lifting the ring-shaped member upward. Accordingly, an opening force is applied to the connecting portion side, and a strain is generated by stress at a position where the ring-shaped member is connected to the connecting portion due to the opening force. When this stress reaches the yield point or more, plastic deformation occurs, and the strain becomes permanent and whitens. Therefore, when at least the ring-shaped member is colored, the whitened portion becomes conspicuous, and the tamper-evident property of the cap is improved together with the breakage of the bridging portion.

In the present invention, the object can be achieved if the ring-shaped member which causes permanent deformation due to the opening force is colored. However, the entire cap may be colored. It can be easily prepared by blending a color pigment described later with the resin to be formed. Thus, by continuing lifting by gripping the ring-shaped member, the ring-shaped member is whitened at a position where the ring-shaped member is connected, and it becomes apparent at a glance that the opening operation has been performed, and the tamper-evident property is remarkable. To improve.

On the inner surface of the top plate of the cap according to the present invention, a small ring-shaped projection is formed outside the inner plug, which engages with the top surface of the container mouth, the outer corner, or the outer surface. Is preferred in terms of sealing performance. 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 plate portion, while a projection engaging 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 opening is an engagement in which the outer peripheral surface of the inner plug and the inner peripheral surface of the container opening are pressed against each other in the radial direction, but are provided outside the inner plug. In the ring-shaped small protrusion, the top surface of the container mouth, the outer peripheral side corner or the outer peripheral surface, and the ring-shaped small protrusion 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, since the sealing is performed on the top surface of the container mouth or on the outer peripheral side thereof, there is an 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 opening are pressed against each other in the axial direction, the ring-shaped projection is naturally compressed and deformed. Has the effect of providing cushioning. Further, the ring-shaped groove formed between the small ring-shaped projection and the inner plug prevents the deformation of one of them from adversely affecting the other, and maintains the sealing function of each of them independently. There is also.

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. That is, the thickness of the ring-shaped member has a certain range with respect to the compatibility between the sealing property and the moldability. If the thickness is too large, it is difficult to remove the protrusion (undercut portion) on the inner surface of the skirt. On the other hand, if the thickness of the ring-shaped member is too thin, there is a problem that the force for holding the container mouth portion by the protrusion (undercut portion) becomes insufficient, and the sealing and retaining property tends to be insufficient. When the thickness of the ring-shaped member is set to a constant thickness as a whole in a range in which the die-cutting is easily performed, the cutout portion of the skirt also has a cutout portion. Tends to have insufficient holding force at the mouth of the container.

According to this aspect of the present invention, the radially outwardly projecting portion is formed at the position corresponding to the skirt cutout portion of the ring-shaped member, so that 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 tagging 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 after the bridging portion is broken, the cap is removed from the container mouth using the connecting portion as an operation point. It is required that whitening occurs at a position connected to the connecting portion. However, in a state where the bridging portion is broken, it is required that the bridging portion has a mechanical strength that can withstand the opening force. On the other hand, when the cap is formed by injection molding, compression molding, or the like, in the ring-shaped member, the portion corresponding to the skirt cutout portion becomes a resin weld portion, and the mechanical strength of this portion tends to be insufficient. There is also a tendency. 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 of the ring-shaped member, the portion corresponding to this protrusion becomes thick. In addition, the reinforcement of the weld portion is also performed, which has an 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, and the ring-shaped member provided with the opening tab is provided with a ring-shaped portion 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 according to 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
By inserting an instrument or the like into the skirt portion and opening the bridge portion without breaking it, it is possible to prevent 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, a load or the like is applied to the bridging portion when the empty cap is loaded, and Can be prevented.

Further, a partially weakened portion can be formed in the upper or lower portion of the connecting portion, and when an unauthorized device is to be opened by inserting a device or the like into the connecting portion, a ring-shaped portion is formed. The member is opened outward, the engagement of the device is easily released, or the weakened portion is deformed or broken, or whitened, thereby clearly indicating that the device is improperly handled at a glance, thereby improving the tamper-evident property.

In the cap of the present invention, the inner plug is 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.

Further, in the cap according to the present invention, the entire periphery or an intermittent plug projecting upward can be formed on the outer peripheral portion of the top plate 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 plate is pushed by the internal pressure, preventing the engaging projections of the skirt from spreading radially outward, and ensuring sealing reliability. Can be increased.

In the cap of the present invention, for example, in an embodiment described later, an inner plug is formed integrally with the cap body as a sealing engagement portion of the cap top plate portion. It may be formed of a separately applied liner. In this case, a low-density polyethylene, an ethylene-based copolymer, various rubbers or thermoplastic elastomers and the like can be formed into an appropriate shape by compression or injection molding. Further, an acrylic resin plastisol, a vinyl chloride resin plastisol, or the like can be formed by using an existing spin lining method or the like.

Further, a gas barrier material can be provided on the top plate on the inner surface side of the inner plug by insert molding or the like, thereby preventing gas permeation through the plastic cap wall and preserving the contents. Performance can be improved. Examples of the gas barrier material include a metal foil such as an aluminum foil, an ethylene-vinyl alcohol copolymer, a vinyl chloride resin, a vinylidene chloride resin, a nylon resin, and a gas barrier resin such as a gas barrier polyester.

An oxygen-absorbing layer may be provided on the top plate instead of 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.

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.

In the present invention, the resin is mixed with a coloring pigment to form a cap. In order to make the whitening of the ring-shaped member conspicuous, it is desirable that the coloring pigment is blended at a ratio of 2 to 10% by weight based on the resin used. Examples of the color pigment that can be blended include, but are not limited to, the following.

Black pigment: carbon black, acetylene black, lamp black, aniline black. Yellow pigment: yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral fast yellow, nickel titanium yellow, navels yellow, naphthol yellow S, Hanza yellow G, Hanza yellow 10G, benzidine yellow G, benzidine yellow GR, quinoline yellow Rake, permanent yellow NCG, tartrazine rake. Orange pigment: red-mouthed lead, molybdenum orange, permanent orange GTR, pyrazolone orange, vulcan orange, induslen brilliant orange RK, benzidine orange G, induslen brilliant orange G
K. Red pigment: Bengala, cadmium red, lead red, cadmium mercury sulfide, permanent red 4R, lysole red, pyrazolone red, watching red calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, alizarin lake,
Brilliant Carmine 3B. Purple pigment: manganese purple, fast violet B, methyl violet lake. Blue pigment: Navy blue, cobalt blue, alkali lake, Victoria blue lake, phthalocyanine blue, metal-free phthalocyanine blue, partially chlorinated phthalocyanine blue, fast sky blue, indaslen blue B
C. Green pigments: chrome green, chromium oxide, pigment green B, malachite green lake, final yellow green G.

The plastic cap of the present invention is produced by using a resin mixed with the above-mentioned coloring pigment and usually in a state where the cap body and the ring-shaped member are integrated by injection molding, compression molding or the like. The cutting surface (separation surface) between the skirt portion and the ring-shaped member may be formed at the time of forming the cap body, but usually, a cutting process is performed after the cap body is formed by cutting with a cutter or the like. Formed by For this reason, the cap of the present invention uses a mold composed of a normal core and a cavity,
The advantage is that it can be manufactured efficiently in a short time, the accuracy of each part of the cap is high, and the occurrence of defective products is small.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. (Embodiment 1) FIG. 1 shows an embodiment of a cap according to the present invention, wherein (A) is a partially sectional side view, (B) is a bottom view, and (C).
FIG. 3 is a front view of the opening tab as viewed from the direction of arrow A in FIG. FIG. 2 is a sectional view taken along the line BB of FIG. 1B, and FIG. 3 is a partially enlarged sectional view of FIG. FIG. 4 is similar to FIG.
B of FIG. 1B in a state where the cap of FIG.
FIG. 5 is a cross-sectional view taken along line C-B of FIG.
It is a C line sectional view. FIG. 6 is a view for explaining the relationship between the opening angle of the projection of the ring-shaped member and the cutout of the skirt, and FIG. 7 is a view for explaining the operation of opening the cap of FIG. It is.

In FIGS. 1 to 5, the cap of the present invention, which is designated as a whole by 1, generally comprises a cap body 2 and a continuous ring-shaped member 3. The cap body 2
It comprises a top plate portion 4 and a skirt portion 5 hanging from the outer periphery thereof.

As is apparent from FIGS. 5 and 6, a projection 8 is formed on the inner periphery of the skirt portion 5 so as to engage with the lower surface of the projection 7 on the outer peripheral side of the container opening 6. 6 is brought into close contact with the inner surface of the top plate portion 4 to perform sealing. In addition, an inner plug 9 that engages with the inner peripheral surface 10 of the container opening 6 is formed on the top plate 4. In this specific example, a radially outward projection 11 is formed on the outer peripheral surface of the inner plug 9, and the inner plug 9 is pressed against and engaged with the inner peripheral surface 10 of the container opening 6, so that the sealing is further ensured. It has become.

The ring-shaped member 3 is provided so as to cover the outer surface of the skirt portion 5 in the form of a continuous ring. The skirt portion 5 of the cap body 2 covered with the ring-shaped member 3 is provided with a plurality of notches 12 extending in the axial direction from the lower end to the middle of the skirt portion at intervals in the circumferential direction. The notch portion 12 is provided such that its upper edge is located above the protrusion 8 of the skirt portion, so that when the ring-shaped member 3 is pulled up, the cutout portion 12 extends radially outward of the protrusion 8. This is preferable for facilitating the spread of the material and improving the easy-opening property. In this cap, the contents attached to the outer periphery of the mouth at the time of filling the contents are passed through the cutout portion 12 to have an advantage of being able to be washed and removed. The advantage of increasing the thermal conductivity to the container mouth is obtained.

The skirt portion 5 and the ring-shaped member 3 of the cap body 2 are separated from each other through an arcuate or circumferential cut surface 13, and the skirt portion 5 and the ring-shaped member 3 are separated from the cut surface. A plurality of rupturable bridging portions 14 below the lower portion 13 and a rupturable connecting portion 15 are integrally formed.

The outer surface of the cap body skirt portion 5 and the inner surface of the ring-shaped member 3 correspond to the cut surface 13 when the cap body 2 is plugged into the container opening 6 (FIGS. 2 and 3). Are in close contact with each other.

Further, an opening tab 16 is formed on a part of the ring-shaped member 3 so as to protrude in a radially outward direction. Has become. On the other hand, a connecting portion 15 between the skirt portion 5 and the ring-shaped member 3 is provided on the opposite side of the opening tab 16. The cut surface 13 may be an arc shape or a circumferential shape (circumferential shape). In this specific example, the cut surface 13 is circumferential, and as shown in FIG. Is filled with the resin below the lower edge of the bridging portion 14 to form an unbreakable connecting portion. On the other hand, in the case where the cut surface 13 is formed in an arc shape except for the connecting portion 15, as in the case described above, consideration for filling the resin deeply is unnecessary. Of course, when the cut surface 13 is formed in an arc shape, the cap needs to be positioned at the time of the cutting process. On the other hand, when the cut surface is formed in the circumferential shape, the positioning is not required at the time of cutting. The processing method is selected in consideration of the advantages and disadvantages.

In FIG. 7 for explaining the opening operation,
At the time of opening, by lifting the ring-shaped member 3, first the bridging portion is broken, and after the bridging portion is broken,
An opening force is applied to a position 17 (hereinafter, referred to as both ends in the connecting portion circumferential direction) connected to the connecting portion 15. Due to this opening force, the engagement between the skirt projection 8 and the outer periphery 6 of the container mouth at the connection portion is released, the connection portion 15 is lifted upward, and the pulling out of the inner plug 9 at the connection portion also starts. The opening operation is completed. In the present invention, since the opening force contributing to unsealing is to bend the ring-shaped member with the connecting portion circumferential end portions 17 serving as fulcrums, by continuing to lift the ring-shaped member 3, both ends of the connecting portion circumferential direction are kept. The portion 17 undergoes plastic deformation and whitens, but at least the ring-shaped member 3
Is colored, such whitening is noticeable,
It is obvious that the package has been opened, and the tamper-evident property is significantly improved.

On the inner surface of the top plate 4 of the cap according to the present embodiment, a small ring-shaped projection 18 which engages with the top surface of the container opening outside the inner plug 9 and the outer peripheral surface of the container opening. A ring-shaped small projection 19 is formed. The outermost small projection 19 engages with the outer peripheral surface of the container mouth to correctly position the top surface 20 of the container mouth.
Of course, the small projection 19 may have a sealing function.
On the other hand, the other small projection 18 provided inside the small projection 19 extends downward, and the top surface 2
0 and the cap are engaged in the axial direction to seal at the top. As shown in FIG. 3, between the small projection 18 and the inner plug 9, compression deformation of the small projection 18 is allowed during sealing.
Are formed circumferentially to maintain と and 独立 independently.

In the present invention, as clearly shown in FIGS. 1 to 5, a radially outward projection 22 is formed on the outer peripheral surface of the ring-shaped member 3 at a position corresponding to the notch 12 of the skirt. It is preferable to keep it. By forming the protruding portion 22 on the ring-shaped member 3, it is possible to achieve both the sealing retention and the moldability (removability), that is, to remove the protruding portion (undercut portion) 8 on the inner surface of the skirt portion. While making this easy, the force for holding the container mouth 6 by the projections (undercut portions) 8 can be set to a sufficient level to improve the sealing and holding performance.

Projection 22 of ring-shaped member 3 toward the outside of diameter
Is preferably formed accurately at a position corresponding to the skirt notch 12, and the tip (ridge line) 23 of the protrusion 22 is, as shown in FIG. Is preferably located on a radial line passing through the center of the circle.

In the specific example shown in the drawings, the outwardly projecting portion 22 provided on the ring-shaped member 3 has a horizontal cross-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 22
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.

[0054] Also as shown in FIG. 6, theta ₁ (an angle from the center) the opening angle to the other hem 24b from one foot 24a of the protrusion 22 in the ring member, the cutout portion 12 of the skirt For the outermost opening angle θ ₀ from one edge 25a to the other edge 25b, θ ₁ / θ
The ratio of ₀ is generally from 1.5 to 3.0, in particular from 1.8 to 2.
It is better to be in the range of 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 projection, and the like, but is generally in the range of 2 to 10 °, particularly 3 to 8 °. Preferably, there is.

When the opening angle ratio θ ₁ / θ ₀ is smaller than the above range or larger than the above range, it tends to be difficult to achieve both the sealing retention and the moldability (removability). 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 present invention, the opening tab 16 is provided on the outer periphery of the ring-shaped member 3. As shown in FIG. 2, the opening tab 16 is provided on the portion of the ring-shaped member 3 provided with the opening tab 16. The provision of the cutout portion 26 from the inner surface side of the ring-shaped member 3 on the inner side and below the ring-shaped member 3 facilitates the die cutting of the skirt projection (undercut portion) 8. Preferred. The opening tab 16 is provided so as to protrude radially outward from the ring-shaped member 3 in order to improve the engagement with the finger. However, when this tab portion becomes thicker, the skirt projection (underside) located inside the opening tab is provided. It becomes difficult to remove the die of the cut portion 8. Opening tab 1
In the portion of the ring-shaped member 3 provided with 6, a notch 26 from the inner surface side of the ring-shaped member 3 is provided inside the opening tab 16 and below the ring-shaped member 3. When the portion 26 is cut out, the skirt protrusion (undercut portion) 8 escapes, so that the die can be easily cut out.

Further, in the cap of this embodiment, FIG.
(C) As is clearer, on the outer periphery of the opening tab 16,
A lower horizontal rib 27 and a large number of vertical ribs 28 provided at a small interval in the circumferential direction above the horizontal rib to reinforce the strength of the opening tab 16 and to clearly indicate its position, At the time of opening, the hooking of the finger is improved so that the finger can be easily gripped.

Due to the presence of a plurality of notches 12 extending in the axial direction provided on the skirt portion 5 of the cap body 2,
In a state where the bridging portion 14 is broken and the ring-shaped member 3 is connected to the cap body 2 only by the connecting portion 15, the skirt portion 5 can expand in the radially outward direction, and thereby the outer periphery of the container mouth portion The engagement between the lower surface of the projection 7 and the inward projection 8 of the skirt is released, and the container opening 6 of the cap body 2 is released.
Therefore, the number of cutouts 12 and the circumferential intervals are appropriately determined from these viewpoints.

In the cap of the present invention, the skirt 5
Although the number of the notches 12 provided in the hole varies depending on the diameter of the cap or the like, generally, the number of the notches 12 is two to two.
It is preferable that the number is 0, especially 8 to 12.

The number of the bridging portions 14 provided between the cap body skirt portion 5 and the ring-shaped member 3 is such that at least one skirt piece 5a between the adjacent notches 12 and 12 and the ring-shaped member 3 are provided. Are preferably connected via the bridging portion 14. Further, the position at which the bridging portion 14 is provided can also be changed variously, for example, as shown in FIG.
In the specific example shown in (1), one is provided at the intermediate position of the skirt piece 5a, but is not limited to this, and two pieces can be provided at both ends of the skirt piece 5a. 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 part 14 in the direction of the cut surface 13 is 0.1 to 0.8 mm ² per piece, and particularly 0.1 to 0.8 mm ² .
It is preferably in the range of ² to 0.4 mm ² .

In the cap of the present invention, as shown in FIGS. 2 and 3, it is desirable to form a small circular recess 29 in the center of the outer surface of the top plate 4 of the cap body. When the cap is manufactured by injection molding, a residue of the gate remains at the center of the outer surface of the top plate, which hinders the smooth flow of the cap, causes dust to be generated when the cap is moved and agitated, and causes a finger on the cap. However, if the small recess 29 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 29. Disadvantages can be prevented.

(Embodiment 2) FIGS. 8 to 11 are diagrams for explaining another embodiment of the present invention. That is, FIG. 8 is a partially enlarged cross-sectional view corresponding to the cross section taken along the line BB of FIG. 1B, and FIG. 9 similarly corresponds to the cross section taken along the line CC of FIG. 1B. It is a partially enlarged cross section of the cross section. FIG. 10 is a cross-sectional view of a state applied to the container mouth in a cross section corresponding to a cross section taken along line BB of FIG.
FIG. 11 is a cross-sectional view of a state applied to the container mouth similarly in a cross section corresponding to the cross section taken along line CC of FIG. 1 (B).

The cap shown in FIGS.
The basic configuration is almost the same as the cap shown in
This cap has a different shape of the mouth of the container to be applied, and in the first embodiment, the projection 18 and the groove 21 are provided on the inner surface of the top plate 3 outside the inner plug 9, but the projection and the groove are omitted. Example 1 is that the container mouth top surface 20 is in direct contact with the inner surface of the top plate.
It is different. This cap is used for a container having a straight short cylindrical portion 30 at the upper part of the outer periphery of the container mouth portion 6 and a bulging portion 31 extending radially outward therebelow. Bulging part 3 from the short cylindrical part 30
The seal is achieved by engaging over the base or the corner of the unit.

[0064]

According to the present invention, a top plate portion and a skirt portion are formed, and a projection is formed on the inner surface of the skirt portion so as to engage with the container mouth portion, and is inserted into the container mouth portion on the inner surface of the top plate portion. A cap body provided with an inner plug, a continuous ring-shaped member integrally provided with the cap body so as to cover an outer surface of the skirt portion of the cap body, and having an opening tab on an outer periphery; and a skirt portion of the cap body. A plurality of notches provided at intervals in the circumferential direction so as to extend in the axial direction; a connecting portion between the continuous ring-shaped member and the skirt portion provided on the opposite side of the opening tab; a skirt portion and a ring-shaped portion A cap comprising a circumferential or arcuate cut surface provided between the members and a plurality of breakable bridging portions connecting the skirt portion and the ring-shaped member below or above the cut surface. Therefore, at least the ring-shaped member of the cap is colored, and the opening is clearly indicated by whitening of the ring-shaped member at a position where the ring-shaped member is connected to the connecting portion, so that the tamper-evident property is surely and apparently apparent ( TE) is 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, by providing a radially outward projection at a position corresponding to the notch of the ring-shaped member, it is easy to die-cut the projection (undercut) on the inner surface of the skirt. In addition, the holding force of the container opening at or near the cutout portion of the skirt is maintained at a sufficient level, and the ring-shaped member used as an opening piece is given a strength that is not inferior to the opening force. The effect is achieved.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a cap of the present invention;
(A) is a partial cross-sectional side view, (B) is a bottom view, and (C) is a front view of an opening tab.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a partially enlarged sectional view of FIG. 2;

4 is a cross-sectional view taken along the line BB of FIG. 1B in a state where the cap shown in FIG. 1 is fitted to a container mouth.

FIG. 5 is a cross-sectional view taken along the line CC of FIG. 1B in a state where the cap shown in FIG. 1 is fitted to a container mouth.

FIG. 6 is a view for explaining the relationship between the opening angle of the projection of the ring-shaped member and the cutout of the skirt.

FIG. 7 is a view for explaining the cap opening operation of the present invention.

FIG. 8 is a partially enlarged cross-sectional view corresponding to a cross section taken along line BB of FIG. 1B of another embodiment of the present invention.

9 is a partially enlarged cross-sectional view corresponding to a cross section taken along line CC of FIG. 1B of another embodiment of the present invention.

FIG. 10 is a cross-sectional view corresponding to a cross section taken along line BB of FIG. 1B of another embodiment of the present invention, in a state applied to a container mouth.

FIG. 11 is a cross-sectional view of another embodiment of the present invention in a state corresponding to a cross-section taken along line CC of FIG. 1B, applied to a container mouth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Cap main body 3 Ring-shaped member 4 Top plate (top surface) part 5 Skirt part 6 Container mouth part 7 Container outer peripheral concave part 8 Projection part 9 Inner ring 10 Container inner part inner peripheral surface 11 Inner ring protrusion part 12 Notch 13 Cut surface DESCRIPTION OF SYMBOLS 14 Bridge part 15 Connecting part 16 Tab for opening 17 Both ends in the circumferential direction of connecting part 18 Top surface of container mouth 19 Small projection for top surface 20 Top surface of container mouth 21 Groove 22 Ring-shaped member protrusion

Continued on the front page (72) Inventor Mitsuo Kumada 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Prefecture F-term in Hiratsuka Plant, Japan Crown Cork Co., Ltd. 3E084 AA04 AA12 AB01 BA01 CA01 CC03 DA01 DB05 DB09 DB13 DC03 EA04 EB03 EC03 FA09 FC07 FC08 GA08 GB08 GB12 GB13 GB17 HA03 HB02 HC03 HD01 KA13 KA15

Claims (3)

[Claims] 1. A top plate portion and a skirt portion, wherein a projection is formed on the inner surface of the skirt portion to engage with the container opening, and a sealing engagement portion with the container opening is provided on the inner surface of the top plate. A cap body, 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 an outer periphery thereof, so as to extend in the axial direction on the skirt portion of the cap body. A plurality of notches provided at intervals in the circumferential direction, a connecting portion between the continuous ring-shaped member and the skirt portion provided on the opposite side of the opening tab, provided between the skirt portion and the ring-shaped member A cap formed of a plurality of breakable bridging portions connecting the skirt portion and the ring-shaped member below or above the cut surface in a circumferential or arcuate shape, wherein at least The resin cap is characterized in that the ring-shaped member is colored and the ring-shaped member is clearly opened at a position where the ring-shaped member is connected to the connecting portion. 2. The container according to claim 1, wherein the sealing engagement portion comprises an inner plug inserted into the container mouth.
The resin cap described. 3. The resin cap according to claim 1, wherein the ring-shaped member is provided with a radially outward projection at a position corresponding to the notch.