JPH11165756A - Plastic cap excellent in differential disposal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic cap which is free from any troubles such that a score is mistakenly broken by general users, and excellent in classified disposal. SOLUTION: A projection-like tab 31 for tearing is provided on a horizontal flange part 7 between a first cylindrical side wall 6 and a second cylindrical side wall 8, a first score 30a for tearing is extended from an end part in the circumferential direction on one side of a root part of the tab for tearing, a second score 30b for tearing is extended to the second cylindrical side wall or the horizontal flange part, a weakened part 35 for breakage continuous to the first or second score for tearing is formed on the horizontal flange part inside the tab for tearing, and when an upper lid is closed, the tab for tearing is covered by the upper lid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic cap having excellent segregation and disposal properties, and more particularly, to a cap body fitted and fixed to a container mouth, and provided on the cap body so as to be freely opened and closed. The cap body relates to a plastic cap having a top plate capable of forming an opening for discharging contents and a cylindrical side wall extending from a peripheral edge of the top plate.

[0002]

2. Description of the Related Art Plastic caps comprising a cap body and an upper lid as described above are well known and widely used in containers for various seasonings, beverages and the like. By the way, recently,
Separation and disposal of containers and caps is required in terms of resource reuse and waste disposal. In a plastic cap of the type described above, the cylindrical side wall of the cap body is fitted and fixed to the mouth of the container by stoppering, so that it is difficult to remove it, and it is desired to improve the sorting and disposal properties.

[0003] Various plastic caps have been proposed for the purpose of improving the separation and disposal properties.
In Japanese Patent No. 35451, a tab is provided at the lower end of the outer surface of the cylindrical side wall portion of the cap main body, and continuously from the base of the tab above the engagement projection with the container opening on the inner surface of the cylindrical side wall portion. A plastic cap is disclosed that has a score that extends and extends circumferentially at a portion above the engagement projection. This cap, by holding the tab by hand and tearing the score, breaks the projection for engagement with the container mouth formed on the inner surface of the cylindrical side wall of the cap main body, without using a special tool, The cap can be easily removed from the mouth of the container by hand, and the separation and disposal properties are extremely good.

[0004]

However, in the above-mentioned prior art cap, since the general user who purchased the cap does not understand the meaning of the tab provided on the outer surface of the cylindrical side wall, the cap was immediately closed. Prior to removal, the tab was pulled and the score was broken. Once the score is broken, the cap can no longer be resealed and loses its function as a cap.

[0005] Therefore, an object of the present invention is to eliminate the problem that a score break tab is not provided on the outer surface of the cylindrical side wall, and a general user accidentally breaks the score. In addition, it is an object of the present invention to provide a plastic cap having excellent separability and disposability, which allows the cap to be removed from the container mouth by hand without using a special tool.

[0006]

According to the present invention, there is provided a cap body fitted and fixed to a container mouth, and an upper lid provided on the cap body so as to be openable and closable. In a cap having a top plate capable of forming an outlet opening and a cylindrical side wall extending from a peripheral edge of the top plate, the cylindrical side wall of the cap main body includes a first cylindrical side wall and a horizontal flange. And a second cylindrical side wall, an upper end of the first cylindrical side wall is connected to the top plate, and an upper end of the second cylindrical side wall is formed through the horizontal flange. The first cylindrical side wall is formed with a locking projection that engages with the outer surface of the container opening, and the first cylindrical side wall and the second cylindrical side wall are formed inside the first cylindrical side wall. A horizontal flange portion between the first cylindrical side wall and the first cylindrical side wall at an interval. A flaky tearing tab is provided, a first tearing score extends from or near one circumferential end of a root portion of the tearing tab, and a circumferential tear on the other side. A second tear score extends from the end or its vicinity, and the first tear score extends through the second cylindrical side wall to the lower end or near the lower end, and the second tear score extends from the end to the vicinity of the lower end. The tear score of extends to the second cylindrical side wall or horizontal flange portion,
A weakened portion for breaking is formed on the horizontal flange portion inside the tearing tab along a base portion of the tab, and the weakened portion is formed in at least one of the first and second scores for tearing. When the upper lid provided on the cap main body is closed, the tear tab is covered with the upper lid, thereby providing a plastic cap having excellent separability and disposal.

In the present invention, no tab for tearing the score is formed on the outer surface of the cylindrical side wall of the cap body, and when the upper lid is closed, the tear tab is covered by the upper lid. Invisible from the outside. Therefore, there is no risk that a person who purchases such a cap may break the score by holding the tearing tab before removing the top lid. Moreover, if the top lid is removed, the contents are left in the container because it is exactly the same as the conventional cap in that the opening for pouring is formed in the top plate of the cap body and the contents are poured out. In this state, the average user hardly breaks the score with the tearing tab.

[0008] The cap of the present invention, with the upper lid removed, pushes the tearing tab outward with a claw, for example, and then pulls the tab by pulling the tab to pull out the second cylindrical shape from the base of the tab. Two extending scores (first and second) extending to the side wall or horizontal flange
Of the container body, the cap body fixed to the container mouth can be easily removed, and the container body such as a bottle can be discarded separately, that is, discarded. Further, in the present invention, a weakened portion for breaking such as a score, a perforation or a slit is formed in the horizontal flange portion inside the tearing tab along the base portion of the tab. For this reason, by pushing down the tearing tab or pulling it by hand,
Stress concentrates on both circumferential ends of the base of the tear tab, and thus the tearing of the two tear scores extending from the stress concentrated portion starts smoothly. The tearing of these scores, once started, proceeds easily thereafter, so that the tearing operation can be easily performed. In this case, if the tearing tab is formed in an arc shape along the first cylindrical side wall, the tearing tab is in an extended state by being pushed down, so that the tearing tab is provided at both ends of the root of the tearing tab. The continuous score is broken or weakened, and the initiation of tearing can be performed more easily. As described above, in the present invention, in order to easily perform the tearing operation of the score, various shapes of the score and the shape of the tearing tab can be selected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to specific examples shown in the accompanying drawings. FIG. 1 is a view showing a basic structure of a cap body used for a plastic cap employed in the present invention. In FIG. 1, (A) is a top view, (B) is a side view, and (C) is It is a bottom view. FIG. 2 is a side sectional view of the cap body of FIG.
3 is a side sectional view showing a plastic cap using the cap body of FIG. 1, that is, a cap body with an upper lid screwed together with a container opening, and FIG. 4 is a side view of the plastic cap of FIG. 3. Further, FIG. 5 shows an enlarged example of the weakened portion for breaking formed on the horizontal flange portion inside the tearing tab (on the side of the first cylindrical side wall).

As shown in FIGS. 1 to 4, the plastic cap of the present invention comprises a cap body 1 and an upper cover 2, and the cap body 1 is, as shown in FIG. It is fitted and fixed to the container mouth 50 by tapping.

The cap body 1 includes a top plate 5 and a top plate 5.
A first cylindrical side wall 6 extending from a peripheral edge of the first cylindrical side wall, a horizontal flange 7 connected to a lower end of the first cylindrical side wall 6, and a second cylindrical side wall 8 extending downward from a distal end portion of the horizontal flange.
(Especially, see FIG. 2). An annular projection 9 is formed integrally with the upper end of the first cylindrical side wall 6, and a thread 9 a for engaging and holding the upper lid 2 is formed on the outer surface of the annular projection 9. I have. On the inner surface of the top plate 5,
An inner ring 10 is formed, and a container opening 5 is provided in a space between the inner ring 10 and the first cylindrical side wall 6.
0 is fitted at the upper end. In addition, a locking projection 11 is formed on the inner surface of the lower end of the first cylindrical side wall 6, and the projection 11 is engaged with the outer surface of the container opening 50, so that the cap body 1 It is firmly fixed to the mouth 50. A score 12 for forming a content liquid discharge opening is formed further inside the inner ring 10, and a tab ring 13 is formed on an outer surface side of a portion defined by the score 12. . That is, the tab ring 13
The score 12 is broken, and an opening for discharging the content liquid is formed in the top plate 5.

The score 12 is provided on the outer surface of the top plate 5.
Are formed so as to surround. The circumferential projections 15 serve as a guide for the liquid to be poured out, and the circumferential projections 15 allow the liquid to be smoothly poured out from the content liquid outlet formed by the breakage of the score 12.

As shown in FIG. 3 in particular, a screw 20 is formed on the inner surface of the upper cover 2, and the screw 20 is screwed with a screw 9 a formed on the outer surface of the annular projection 9. By doing so, the upper lid 2 is screwed to the cap body 1. Therefore, the upper lid 2 is fixed to a portion above the horizontal flange 7. An annular projection 21 is formed on the inner surface of the upper lid 2 so that the annular projection 21 can be in close contact with the inner surface of the circumferential projection 15 formed on the top plate 5 of the cap body 1. This annular projection 2
Due to the close contact between the projections 1 and the circumferential projections 15, the sealing performance after the opening for discharging the content liquid is formed in the top plate 5 of the cap body 1 is ensured.

In the present invention, first and second two tearing scores 30a and 30b are provided on the second cylindrical side wall 8, and the upright protruding piece-like tearing tab is provided on the horizontal flange 7. 31 are provided. That is, FIGS. 1A and 1B
As shown in (1), both the first tear score 30a and the second tear score 30b extend to both circumferential ends of the root portion of the tear tab 31 or to the vicinity thereof. The first tear score 30 a is inclined toward the second tear score 30 b and extends to the lower end of the second cylindrical side wall 8. Also the second
The score 30b extends circumferentially on the wall surface of the second cylindrical side wall 8. That is, by pushing down the tearing tab 31 and pulling it, the first score 30a is broken and the second cylindrical side wall 8 is divided, but at the same time, the breaking of the second score 30b progresses to some extent. I do. Therefore, the score 30b is torn by pulling in the circumferential direction while holding the tearing tab 31 by hand. As a result, the lower portion of the horizontal flange 7 is exposed to the outside, so that the cap body 1 can be easily removed from the container opening 50.

Although not shown, several ribs may be formed on the inner surface (on the side of the first cylindrical side wall 6) and / or the outer surface of the upper portion of the tearing tab 31.
By forming such a rib, the nail can be hooked on the tearing tab 31 or the tab 31 can be easily picked, and the tearing operation of the scores 30a and 30b can be performed more easily.

The horizontal flange 7 inside the tear tab 31 (on the side of the first cylindrical side wall 6) is provided with a tear tab 3
A weakened portion for breaking 35 is formed along the base portion of No. 1. Both ends of the break weakening portion 35 are connected to the first and second scores 30a and 30b, respectively. Therefore, when the tearing tab 31 is pushed down and pulled, the pulling force is equal to the first and second scores 30.
Since the concentration is at the ends of a and 30b, the tearing of these scores can be easily started. In addition, score 30
In order to easily start the tearing of a and 30b, the weakened portion for breaking 35 is preferably a slit or a perforation.
The tearing of 0a, 30b can be started. In order to prevent deformation and breakage of the horizontal flange 7 when the cap main body 1 is plugged, breakage of the scores 30a and 30b, and the like, it is most preferable that the break weakening portion 35 is a score.

Referring to FIG. 1 (A), tear tab 3
1 is spaced apart from the first cylindrical side wall 6 and
Is preferably formed in an arc shape along. Tab 3
By making the shape of 1 into an arc shape and pushing it down,
Since both ends are stretched, stress concentrates on both ends of the base of the tearing tab 31, and as a result, the tearing from the weakened portion for breaking 35 to the first and second scores 30a and 30b starts smoothly.

The length of the second tearing score 30b extending circumferentially is as long as the cap body 1 can be easily removed from the container opening 50 when the tearing is completed. It is optional and extends, for example, over substantially the entire circumference of the second cylindrical side wall 8, and in some cases, the second score 30b may intersect the first score 30a. However, in general, as shown in FIG. 1A, the second tearing score 30b is generally formed by a portion (about the second cylindrical side wall 8) of about 270 degrees of the second cylindrical side wall 8. Preferably, it is formed over about ３ of the entire circumference of the side wall 8. That is, when the second tearing score 30b is formed over substantially the entire circumference of the second cylindrical side wall 8, when the score 30b is broken, the second cylindrical side wall 8 is completely separated from the cap main body 1. As shown in Fig. 1 (A)
If the score 30b is formed as shown in FIG.
0b, the second cylindrical side wall 8 remains in the cap body 1
Since the second cylindrical side wall 8 is pulled up, the second cylindrical side wall 8 can be easily removed from the container opening 50 integrally with the cap body 1 by pulling up the divided second cylindrical side wall 8. Further, the first score 30a is not necessarily the second cylindrical side wall 8
Need not extend to the lower end of the first score 30
The first score 30a can be terminated near the lower end of the second cylindrical side wall 8 as long as the second cylindrical side wall 8 can be completely torn and divided along a.

As described above, the locking projection 11 is formed inside the lower end of the first cylindrical side wall 6, and the locking projection 11 is formed on the first cylindrical side wall. 6 can be formed over the entire circumference, but usually, FIG.
As shown in (C), it is preferable that the second score 30b is not formed at the position of the end point. FIG.
In (C), the part where the locking projection 11 is interrupted is referred to as 11.
Indicated by a. That is, after the score 30b is torn, the cap main body 1 is removed from the container opening 50 by pulling up the broken second cylindrical side wall 8 upward.
At this time, if there is no locking projection 11 engaged with the container mouth 50 at the end point of the score 30b, the first cylindrical side wall 6 can be easily turned up. It is. A plurality of such portions 11a where the locking projections 11 are interrupted can be formed.
In (C), the locking projection 11 can be similarly interrupted on the opposite side of the portion 11a.

In the present invention, a concave portion 40 is formed at the lower end of the upper lid 2 so that the upper lid 2 is connected to the cap body 1.
When screwed into
It is located within. That is, as clearly shown in FIG. 4, when the top lid 2 is closed, the tear tab 3
1 is completely invisible from the outside. Therefore, there is no possibility that a general user tears the scores 30a and 30b by the tearing tab 31 before opening the upper lid 2. Further, when the cap is distributed, there is no possibility that the scores 30a and 30b are broken due to the tearing tab 31 being hooked.

In addition, according to the present invention, the shape of the weakening portion for breaking 35, the shape of the tearing tab 31, or the arrangement of the two tearing scores 30a and 30b are variously changed, so that the tearing of these scores can be performed. Can be easily performed.

FIG. 5 particularly shows an example of the shape of the weakening portion 35 for breaking. In FIG. 5A, the tearing tab 31 is used.
Weakening portion 35 provided on the horizontal flange 7 inside the
Is a slit. That is, the slit 35 extends along the inner root of the tearing tab 31, and both ends 35 a, 35 a thereof are connected to the tearing tab 31.
Are bent outward along the circumferential end of the second cylindrical side wall 8, and the leading end thereof is connected to two tearing scores 30a and 30b formed on the second cylindrical side wall 8. FIG. 5 (B)
This is an example in which the weakening portion for break 35 is scored. The score 35 extends along the inner root of the tearing tab 31 just like the slit 35 of FIG. 5A, and both ends 35a, 35a are circumferential ends of the tearing tab 31. , And are connected to two tearing scores 30a and 30b formed on the second cylindrical side wall 8 at the ends. FIG. 5C is an example in which the weakened portion for breaking 35 is formed by a slit and a score. That is, the breaking weakened portion 35 is formed by a slit 35x extending along the inner root of the tearing tab 31 and a score 35y extending outward along the circumferential end of the tearing tab 31. Is formed. The slit 35x and the score 35y are integrally connected, and at the tip of the score 35, are connected to two tearing scores 30a and 30b formed on the second cylindrical side wall 8. FIG.
(D) is an example in which the second tear score 30 b is formed on the horizontal flange 7. In this example, the breaking weakening portion 35 is formed by a slit, and the slit 35
Extends along the inner base of the tearing tab 31, and one end 35 a thereof is bent outward along the circumferential end of the tearing tab 31, as in FIG. The leading end is connected to the tear score 30a formed on the second cylindrical side wall 8. Also slit 3
5 is bent outward along the circumferential end of the tear-off tab 31, while the horizontal flange 7
Ends at the center of the horizontal flange 7
It is connected to the second tear score 30b formed above. In the case where the breaking weakening portion 35 is formed as a slit, the slit is preferably linear, but may be wide such that an opening is formed.

FIGS. 6 to 8 show the main parts of the cap body in which the shape of the tearing tab 31 is particularly changed.

FIG. 6 shows that two tear scores 30a and 30 are formed by turning the tear tab 31 in the circumferential direction.
4 shows an embodiment in which the start of tearing of b is performed. In this embodiment, the extension portion 60 is formed on one side surface (the first score 30a side) of the tearing tab 31, and the extension portion 60 is formed.
Are free from the horizontal flange 7.
That is, the lower end of the extension portion 60 and the horizontal flange 7 are separated from each other and can be turned up freely. Therefore, by turning the tearing tab 31 in the circumferential direction, the tearing of the first tearing score 30a and the score 35 is easily started, and then the tearing of the second tearing score 30b is also easily started. In this case, if the extension 60 is turned up during the use of the cap (that is, before the disposal), the upper lid 2 cannot be closed, so the extension 60 is locked to the horizontal flange 7. Therefore, the lower end of the extension portion 60 and the horizontal flange 7 can be partially or entirely connected by a score. Also, instead of providing a score between the two, the lower end of the extension 60 may be fixed to the horizontal flange 7 by a breakable bridge. The back side of the extension 60 (the first cylindrical side wall 6 side)
Preferably, a rib extending in the vertical direction is formed on the front side. That is, by forming such ribs, the extension portion 60 can be easily turned by hooking a claw.

In the embodiment shown in FIG. 7, tearing of the score is started by pushing the tearing tab 31 downward. In this embodiment, the tearing tab 31 has a trapezoidal shape, with a short upper end and a long lower end.
The first tearing score 30a extends almost along the axial direction of the cap to the lower end of the second cylindrical side wall 8, and is connected to the tearing tab 31 connected to the score 30a.
Side 31a is substantially vertical and the tear tab 31
The other side surface 31b is a gentle slope, and a ring-shaped tearing score 30b extends to the lower end thereof.
Is extending. That is, when the tearing tab 31 is pushed in, the force concentrates on the ends of the scores 30a and 35, and the tearing of the scores 30a and 35 starts easily. When the tearing starts, the tearing tab 31
The score 30a can be easily torn to the lower end by turning it outward, and then the circumferential second tearing score 30b can be easily torn by pulling in the circumferential direction. In this case, the side surface 31a of the tab 31 may be slightly inclined.

The embodiment of FIG. 8 shows two tear scores 3
FIG. 8 shows an example in which each of 0a and 30b extends almost along the axial direction of the cap to the lower end of the second cylindrical side wall 8.
Inside, (A) is a top view of the cap body, (B) is a side view,
(C) It is a bottom view. In this example, the tearing tab 31
By pushing it down and pulling it down
The tear scores 30a and 30b of the book are torn at the same time, and this portion is peeled off. Therefore, the cap body 1 can be easily removed from the container opening 50 by turning up the lower end of the exposed first cylindrical side wall 6.

In this embodiment, as shown, it is preferable to provide two tearing tabs 31 at positions symmetrical with respect to the cap. Thereby, removal of the cap main body 1 from the container opening 50 can be performed more easily. Further, in the portion where the tear tab 31 is formed, it is preferable that the locking projection 11 provided inside the lower end of the first cylindrical side wall 6 is interrupted. In this way, two tearing scores 30
After peeling off the portion between a and 30b, the first cylindrical side wall 6 can be easily turned up from the lower end. In any of the above-described embodiments shown in FIGS. 6 to 8, a weakened portion for breaking 35 should be formed entirely on the back side (the side of the first cylindrical side wall 6) of the root portion of the tearing tab 31. For example, it is preferable that the weakened portion for breaking 35 is formed in any of the shapes shown in FIGS. By forming such a weakened portion for breaking 35,
This is because the tearing tab 31 can be easily turned, pushed or pushed down in the circumferential direction, and the tearing of the score can be easily started.

In all of the above-described specific examples, the caps in which the upper lid 2 is screwed to the cap body 1 have been described as examples, but these can also be applied to hinge caps. 9 is a top view of the hinge cap with its upper lid opened, FIG. 10 is a bottom view of the hinge cap of FIG. 9, FIG. 11 is a side sectional view of the hinge cap of FIG. 9, and FIG. 9 is a side sectional view showing a section taken along the line AA of FIG. 9 in a state in which the upper lid of the hinge cap 9 is closed.
FIG. 7 is a side cross-sectional view showing a BB cross section in a state where an upper lid of the hinge cap is closed.

In this hinge cap, the upper lid 2 is hinged to the cap body 1 (80), and the upper lid 2 is opened and closed by turning about the hinge coupling portion 80 as a fulcrum. In such a hinge cap, the structure of the cap body 1 has basically the same structure as that of the screw-type cap shown in FIG. Hereinafter, the structure of the cap body 1 will be briefly described. That is, the first cylindrical side wall 6 extends downward from the peripheral edge of the top plate portion 5, a horizontal flange 7 is formed at the lower end of the cylindrical side wall 6, and the second cylindrical side wall 8 extends from the horizontal flange 7. Is extending. An annular projection 9 is connected to the upper end of the first cylindrical side wall 6, and a projection 9 a for engaging and holding the upper lid 2 is formed on the outer surface of the annular projection 9. Further, a locking projection 11 is formed on the inner surface of the lower end of the first cylindrical side wall 6.
An inner ring 10 is provided on the inner surface of the top plate 5,
A score 12 for forming a content liquid discharge opening is formed inside the inner ring 10, and the outer surface of the top plate portion 5 surrounds the score 12 for guiding the liquid to be discharged. A circumferential projection 15 is provided, and a tab ring 13 for tearing the score 12 to form an opening is formed.

The upper cover 2 of the hinge cap includes a top surface 65 and a skirt wall 66 connected to a peripheral portion of the top surface 65. The skirt wall 66 has a tip (the upper cover shown in FIG. 11). 2, the upper end portion is set to have a length such that it comes into contact with the horizontal flange 7 when the upper lid 2 is closed. At the end of the skirt wall 66, a tab 6 for opening is located at a position opposite to the hinge connection portion 80.
7 are provided. On the inner surface of the top surface 65, a pair of annular protrusions 68, 68 are provided. This annular projection 68,
Reference numeral 68 is formed so as to fit with the upper end of the peripheral projection 15 for guiding the liquid to be discharged provided on the cap body 1 when the upper lid 2 is closed. That is, the fitting of the two ensures the sealing performance when the pouring opening is formed in the top plate 5 of the cap body 1. Further, an annular projection 69 for locking is formed on the inner surface of the skirt wall 66. When the upper lid 2 is closed, the annular projection 69 engages with the aforementioned projection 9a, so that the upper lid 2 is firmly fixed.

The hinge connecting portion 80 connects the upper end of the second cylindrical side wall 8 of the cap body 1 and the tip of the skirt wall 66 of the upper lid 2 as shown in FIG. 11, for example. Although formed, the connection position is not limited to this portion. For example, in some cases, the first cylindrical side wall 6 and the skirt wall 66 can be hingedly connected, or a part of the second cylindrical side wall 8 can be protruded upward from the horizontal flange 7, and the protruding portion can be formed. Hingedly on the skirt wall 66 with the horizontal flange 7 and the first cylindrical side wall 6
And the second cylindrical side wall may form an integrated base, which may be hinged to the skirt wall 66.
In these cases, the hinge connection portion projects from the horizontal flange 7, and thus corresponds to the protrusion or base of the first cylindrical side wall 6 on which the hinge connection portion 80 is formed when the upper lid 2 is closed. The length of the skirt wall 66 where
It is necessary to make the length of the skirt wall 66 corresponding to the horizontal flange 7 shorter. Therefore, the skirt wall 66 has a shape having a step. Further, in these embodiments, since the fulcrum of the rotation of the upper lid 2 is formed in a portion close to the peripheral projection 15 for guiding the liquid to be discharged, as compared with the example of FIG. The length of the annular projections 68 can be increased, which is advantageous in terms of sealing performance.

Further, the hinge connecting portion 80 may have a structure known per se. For example, as shown in FIG. 9, a pair of connecting portions 80a and a hinge band 8 provided therebetween are provided.
0b. That is, the upper cover 2 turns around the connecting portion 80a, and the turning is controlled by the hinge band 80b. For example, when the upper lid 2 is turned in the opening direction, the hinge band 8 is turned at a certain angle or more.
0b is in a fully extended state, and when it turns further, the hinge band 80b is in a state of being bent again. That is, FIG.
As shown in FIG. 1, when the upper cover 2 is completely opened, the hinge band 80b is in a bent state. Therefore, when closing the upper lid 2, the hinge band 80b must be fully extended, and external force is required.
Therefore, as long as no external force is applied, the upper lid 2 is maintained in a completely opened state as shown in FIG.

In the hinge cap having the above structure,
A tear tab 31 is formed on the horizontal flange 7, and the first and second tear scores 30 a and 30 b and the break weakening portion 35 are provided as described with reference to FIGS. 1 to 8. In the portion where the tear tab 31 is formed, the locking projection 11 on the inner surface of the first cylindrical side wall 6 is interrupted. In the hinge cap according to the present embodiment, as shown in FIGS.
The tear score 30a of the second tear score 30a extends obliquely to the lower end of the second cylindrical side wall 8, and the second tear score 30a
b extends circumferentially around the second cylindrical side wall 8. In addition, the skirt wall 66 of the upper lid 2 has a recess 70 formed by making a part thinner (see FIGS. 9 and 11). That is, the concave portion 70 extends upward from the lower end of the skirt wall 66,
When the upper lid 2 is closed, it is formed at a position corresponding to the tearing tab 31. That is, when the upper lid 2 is closed, the tear tab 31 is accommodated in the recess 70. Thereby, even if the tearing tab 31 is formed, the opening and closing of the upper lid 2 can be performed smoothly.

In such a hinge cap of the present invention,
As is clear from FIG. 9, it is preferable that the tearing tab 31 is formed at a position apart from the symmetric position (P) of the hinge connecting portion 80. That is, at the symmetrical position (P) of the hinge connecting portion 80 or in the vicinity thereof, when the upper lid 2 is closed, the swing of the tip of the upper lid skirt wall 66 is large. Therefore, if the tearing tab 31 is formed at or near the symmetrical position (P), a disadvantage that the tip of the skirt wall 66 hits the tearing tab 31 is likely to occur. However, the farther away from the symmetrical position (P) of the hinge connection portion 80, the less the swing of the tip of the skirt wall 66 is, so the above-mentioned inconvenience can be effectively prevented. In particular, in the case of the hinge cap, if the skirt wall 66 once comes into contact with the tearing tab 31 and the tab 31 is deformed, the stopper 31 may be brought into contact even after the stopper is closed. There is. Therefore, it is extremely important to prevent the tip of the skirt wall 66 from coming into contact with the tearing tab 31 when closing.

In order to effectively prevent the contact between the skirt wall 66 and the tearing tab 31 as described above, the center α of the tearing tab 31 and the center O of the cap usually vary depending on the size of the cap. And a straight line connecting the center β of the hinge connecting portion 80 and the center O of the cap is preferably 135 degrees or less, particularly 90 degrees or less. That is, as the angle θ is smaller, when the upper lid 2 is closed, the tab 31
Is formed, so that the contact between the tab 31 and the skirt wall 66 at the time of plugging can be effectively prevented. However, when the tearing tab 31 is too close to the hinge connecting portion 80, it is difficult to tear from the tab 31. Therefore, the tab 31 is formed at a position away from the connecting portion 80 to such an extent that the tearing is not difficult. It is necessary to keep.

In the hinge cap, it is desirable that the second tear score 30 b extending circumferentially around the second cylindrical side wall 8 does not pass through the hinge connecting portion 80. In FIG. 9, the end point of the score 30 b is the position indicated by Q, and does not extend to the hinge connection portion 80. That is, when the first and second scores 30a and 30b are torn by holding the tearing tab 31 and then the cap body 1 is removed from the container mouth 50, the hinge connecting portion 80 is used.
If is left without being torn, the cap body 1 can be more easily removed by pulling up the torn second cylindrical side wall or the upper lid 2 by hand. Further, as described above, the tearing tab 31 is connected to the symmetrical position (P) of the hinge connecting portion 80.
If the angle θ is formed in the above-described range, the length of the second tearing score 30b extending circumferentially around the second cylindrical side wall 8 is made as long as possible. There is an advantage that can be. Tear tab 3
1 is formed at or near the symmetrical position (P), the length of the second tearing score 30b is at most １ ／ of the entire circumference of the cap if the hinge connecting portion 80 is left. It is about. On the other hand, if the tearing tab 31 is formed in a portion near the hinge connecting portion 80, the second tearing score 30b can be set longer than の of the entire circumference of the cap, and the cap body 1 can be removed. This is extremely advantageous in performing.

In the hinge cap described above, FIG.
Needless to say, various changes shown in FIGS.

[0038]

According to the present invention, since the score tearing tab is hidden by the upper lid and cannot be seen from the outside, the score is broken by accidentally pulling the tab before the general user opens the upper lid. There is no trouble of getting it. Further, since the two scores formed on the second cylindrical side wall can be easily torn, the cap body can be easily removed from the container opening without using any special tool, Very good separation and disposal.

[Brief description of the drawings]

FIG. 1 is a top view, a side view, and a bottom view showing a cap body of a screw-type plastic cap of the present invention.

FIG. 2 is a side sectional view of the cap body of FIG. 1;

FIG. 3 is a side sectional view showing a state where an upper lid is attached to the cap body of FIG. 2;

FIG. 4 is a side view of the cap shown in FIG. 3;

FIG. 5 is a partially enlarged view showing various examples of the shape of the breaking weakening portion.

FIG. 6 is a diagram showing another example of a tearing tab.

FIG. 7 is a view showing still another example of a tearing tab.

FIG. 8 is a top view, a side view, and a bottom view of a cap body in another embodiment of the screw-type plastic cap of the present invention.

FIG. 9 is a top view of the present invention in a state where an upper cover of a hinge cap is opened.

FIG. 10 is a bottom view of the hinge cap of FIG. 9;

FIG. 11 is a side sectional view of the hinge cap of FIG. 9;

FIG. 12 is a side sectional view showing an AA section in a state where an upper lid of the hinge cap of FIG. 9 is closed.

FIG. 13 is a side sectional view showing a BB section in a state where an upper lid of the hinge cap of FIG. 9 is closed.

[Explanation of symbols]

 1: Cap body 2: Top lid 5: Top plate 6: First cylindrical side wall 7: Horizontal flange 9: Annular protrusion 11: Locking protrusion 30a: First tear score 30b: Second tear score 31 : Tear tab 35: weakened part for breaking 66: skirt wall of upper lid 70: thin concave part 80: hinge connecting part

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masao Yashimoda 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Inside the Hiratsuka Plant of Crown Cork Co., Ltd. (72) Inventor Yoichi Tsujiguchi 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Nippon Crow (72) Inventor Yasunori Yamazaki 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Inside Hiratsuka Plant

Claims (13)

[Claims] 1. A cap body fitted and fixed to a container mouth, and an upper lid provided on the cap body so as to be openable and closable, wherein the cap body has a top plate capable of forming an opening for discharging contents. In a cap having a cylindrical side wall extending from a peripheral portion of the top plate portion, the cylindrical side wall of the cap body includes a first cylindrical side wall, a horizontal flange portion, and a second cylindrical side wall. Composed of the first
The upper end of the cylindrical side wall is connected to the top plate,
The upper end of the cylindrical side wall of the second through the horizontal flange portion
The first cylindrical side wall has a locking projection formed on the inner side of the first cylindrical side wall to engage with the outer surface of the container opening. On the horizontal flange portion between the cylindrical side wall and the first cylindrical side wall, a protruding piece-like tearing tab is provided upright at a distance from the first cylindrical side wall, and one side of a root portion of the tearing tab is provided. A first tear score extends from the circumferential end or the vicinity thereof, and a second tear score extends from the other circumferential end or the vicinity thereof. The score for use extends through the second cylindrical side wall to the lower end or near the lower end thereof, and the score for tearing extends to the second cylindrical side wall or the horizontal flange portion. Break along the base of the tab on the horizontal flange inside the tab A weakening portion is formed, the weakening portion is connected to at least one of the first and second tear scores, and when the upper lid provided on the cap body is closed, the tear tab is A plastic cap that is covered with an upper lid and has excellent separability. 2. The plastic cap according to claim 1, wherein an annular projection provided with a thread for engaging and supporting the upper lid is provided on a peripheral portion of the top plate portion of the cap body. 3. The plastic cap according to claim 1, wherein the tear tab is formed in an arc shape along the first cylindrical side wall. 4. The plastic cap according to claim 1, wherein the breaking weakening portion is a score, a slit or a perforation. 5. The plastic cap according to claim 4, wherein the breakage weakening portion is formed on both sides in the circumferential direction of the tearing tab following the inside of the tearing tab. 6. The plastic cap of claim 1, wherein the second tear score extends circumferentially around the second cylindrical side wall. 7. The plastic cap according to claim 1, wherein the first tear score is inclined toward the second tear score and extends to the lower end of the second cylindrical side wall or the vicinity thereof. 8. The plastic cap according to claim 1, wherein each of the first and second tear scores extends along an axial direction of the cap. 9. The two tearing tabs are provided at positions symmetrical with respect to the center of the cap.
The plastic cap described in 1. 10. The plastic cap according to claim 1, wherein an upper lid is hingedly connected to the cylindrical side wall. 11. The tear tab is formed such that an angle between a straight line connecting the center of the tear tab to the center of the cap and a straight line connecting the center of the hinge connecting portion to the center of the cap is within 135 degrees. Item 11. A plastic cap according to item 10. 12. The plastic cap according to claim 11, wherein the second score extends circumferentially from a side of the tearing tab opposite to the hinge connection portion on a horizontal flange portion or a second cylindrical side wall. . 13. The upper lid comprises a top surface and a skirt wall extending from a peripheral portion thereof, and a portion of the skirt wall corresponding to the tearing tab in a state where the upper lid is closed,
The plastic cap according to claim 10, wherein a concave portion is formed.