JPH1129166A - Cap made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detach an outer cylinder part from a container by a single operation in which it is torn along first weak lines, by forming the first weak lines from the lower ends of opposite internal peripheral walls of the outer cylinder part, across which first and second center lines forming a specific range of central angle go to the vicinities of the upper ends of them. SOLUTION: From the lower ends of opposite internal circular walls 4 of an outer cylinder 2, across which two center lines 11 forming a central angle of 60 deg. or less go, to at least the vicinities of the upper ends of them, first weak lines 5 are formed. Here, it is preferable that the first weak lines 5 be formed in the positions which divide the cap into almost two equal parts. The first weak lines 5 take the form of groove, score, perforations, wide thin part, or the like which is tearable. They are formed on the internal circular walls 4 of the outer cylinder 2 or the external circular walls of it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin cap suitable for recycling.

[0002]

2. Description of the Related Art In the case of a synthetic resin cap having an outer cylindrical portion engaged with a container mouth, for example, a cap in which an outer cylindrical portion and an outer lid are connected by a hinge, the container (bottle) and the cap are recycled. In this case, since the outer cylinder of the cap is tightly connected to the container (bottle), it took a lot of effort to remove the cap. Therefore, in the hinged caps of Japanese Utility Model Laid-Open No. 5-34151, Japanese Utility Model Laid-Open No. 7-857, and Japanese Utility Model Laid-Open No. 7-11559, a weakening line is provided at the hinge portion along the outer cylinder portion, and the outer cylinder portion is provided from both ends of the hinge. Attempts have been made to provide two weakening lines parallel to the bottom and remove the cap from the bottle by cutting the weakening line.

[0003]

However, Japanese Utility Model Laid-Open No. 5-34151, Japanese Utility Model Laid-Open No. 7-857, and Japanese Utility Model Laid-Open No. 7-1.
In the hinged cap of No. 1559, the weakened line of the hinge portion is cut, and then the two weakened lines of the outer tube portion are cut to remove a part of the hinge portion and the outer tube portion. Must be removed from container opening. That is, in the case of this cap, two operations are required to remove the cap from the opening of the container, which is not preferable for a recycling activity having low profitability. Further, since the cap is eventually divided into two parts, there is a problem that small pieces are scattered in the work place.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to a synthetic resin cap 3 having an outer cylindrical portion 2 which is tightly engaged with a container opening 1 in order to solve the problems of the conventional cap. Outer cylinder part 2 that intersects two center lines within a central angle of 60 degrees
Are provided with the first weakening lines 5 and 5 at least from the opposed lower end to at least the vicinity of the upper end. In addition to the first weakening lines 5 and 5, the first
A second weakening line 6 similar to the first weakening lines 5, 5 is provided between the weakening lines 5 and 5, for example, at a substantially central position in the circumferential direction.
May be provided. It is preferable that the first weakening lines 5 and 5 are provided at positions where the cap is approximately bisected,
It suffices if the inner and outer peripheral walls are between the two center lines intersecting with the outer cylindrical portion 2. The weakening lines 5 and 6 may be anything that can be torn, such as a kerf, a score, a perforation, and a wide thin portion. Each of the weakening lines 5 and 6 may be provided from the lower end to the upper end of the outer cylinder portion 2 facing each other, but in consideration of the engagement force between the container mouth and the cap, the weakening lines 5 and 6 may be provided from the lower end of the inner cylinder wall 4 of the outer cylinder portion 2 facing each other. At least up to the vicinity of the upper end is preferable. Each of the weakening lines 5 and 6 may be formed on either the inner peripheral wall or the outer peripheral wall of the outer cylindrical portion 2.

Each of the weakening lines 5 and 6 is formed, for example, as one or more straight lines or curved lines upwardly extending from the lower end of the inner peripheral wall 4 of the outer cylindrical portion 2, a straight line splitting upward from the lower end in two opposite directions, or It may be formed in a curved shape that is divided into two branches in the opposite direction upward from the lower end. The first weakening lines 5 and 5 may be one or more vertical or inclined straight lines or inclined curves, and it is more preferable that the inclined angle is 45 degrees or more, since the tearing is easy and the detachment is easy.

[0006] When the outer cylinder portion 2 and the outer lid 7 are connected by a hinge 8 and the first weakening lines 5 and 5 are provided at least 30 degrees apart from both ends of the hinge 8, they are easily torn and removed. It is preferable because it is easy. Of course, the present invention can also be applied to a cap in which the outer cylinder 2 and the outer lid 7 are not connected by the hinge 8. The engagement between the cap 3 and the container opening is made by a ridge 9 provided on the inner peripheral wall 4 of the outer cylindrical portion 2 of the cap 3 and a ridge 10 provided on the outer wall of the container opening 1.
It is preferable that the present invention is usually applied to a synthetic resin cap 3 having an outer cylindrical portion 2 tightly engaged with a container opening 1 like a cap which is engaged with a cap 3. The present invention can also be applied to a case where the screw is engaged with the container opening.

[0007]

The cap according to the present invention has a first weakening line 5 extending from the lower end of the opposing inner peripheral wall 4 of the outer cylinder portion 2 intersecting the two center lines within a central angle of 60 degrees to at least near the upper end.
5 is provided, when removing the cap from the bottle mouth after the contents are exhausted, lift the outer lid or pry the lower end of the outer cylinder to tear the first weakening line and remove it in one operation. The tube can be removed from the container (bottle) opening. Specifically, when the first weakening line is torn from the lower end of the opposing inner peripheral wall 4 of the outer cylindrical portion 2 to at least the vicinity of the upper end, the remaining portion is broken by the force.

[0008]

FIG. 1 shows a synthetic resin cap 3 according to a first embodiment of the present invention.
2 is a cap 3 in which a ridge 9 provided on the inner peripheral wall 4 of the outer cylindrical portion 2 and a ridge 10 provided on the outer wall of the container mouth 1 are tightly engaged with each other. As described above, the outer cylinder portion 2 is provided from the lower end to the at least the vicinity of the upper end of the opposing inner peripheral wall 4 of the outer cylinder portion 2 intersecting the two center lines 11 and 11 within the central angle of 60 degrees. The first weakening lines 5 and 5 of the first embodiment are cut grooves as shown in an enlarged manner in FIG. More specifically, the first weakening lines 5 and 5 of the first embodiment are provided vertically from the lower end of the opposed inner peripheral wall 4 of the outer cylindrical portion 2 intersecting with one center line to at least the vicinity of the upper end. Is provided at a position about 90 degrees in the circumferential direction from the position.

FIG. 4 shows a second embodiment of the present invention, in which two first weakening lines 5 and 5 are provided in parallel.

FIG. 5 shows a third embodiment of the present invention, in which first weakening lines 5 and 5 are provided on the outer peripheral wall of the outer cylindrical portion 2 of the cap 3, and the positions thereof are as shown in FIG. 1st of 1
Although the positions of the weakened lines 5 and 5 are different, the weakened lines 5 and 5 are provided from the opposed lower end to the vicinity of the upper end of the outer cylindrical portion 2 that intersects two center lines within a central angle of 60 degrees.

FIGS. 6 and 7 show Embodiments 4 to 6,
In Example 4 in FIG. 6, the first weakening lines 5 and 5 are one or more inclined straight lines, and the inclination angle θ is 45 degrees or more.
By setting the inclination angle θ in this manner, it becomes easy to tear when detached. In the fifth embodiment shown in FIG. 7A, the weakening lines 5 and 5 are formed in the form of inclined straight lines that are bifurcated in the opposite direction upward from the lower end of the inner peripheral wall 4 of the outer cylindrical portion 2. With such a bifurcated structure, the first tear causes a tear in one weakened line, and the subsequent tear causes a tear in the other weakened line, making it easier to remove.
In Embodiment 6 of FIG. 7B, each weakening line 5
The inner peripheral wall 4 is formed in an upwardly convex inclined curve shape that is bifurcated in the opposite direction upward from the lower end of the inner peripheral wall 4.

FIG. 8 shows a seventh embodiment.
In addition to the first weakening lines 5 and 5 of the first embodiment, the first weakening lines 5 and 5 are provided at substantially the center in the circumferential direction between the first weakening lines 5 and 5 of the inner peripheral wall 4 of the outer cylindrical portion 2. A second weakening line 6 similar to that described above is provided to further facilitate removal.

[Brief description of the drawings]

FIG. 1 is a sectional view of a synthetic resin cap according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a part of FIG. 1 in section;

FIG. 3 is a cross-sectional view of a main part showing a shape of a first weakening line according to the first embodiment.

FIG. 4 is a sectional view of a main part of a synthetic resin cap according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a synthetic resin cap according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a synthetic resin cap according to a fourth embodiment of the present invention.

FIG. 7 is a view showing Examples 5 and 6 of the synthetic resin cap of the present invention.
FIG.

FIG. 8 is a plan view of a synthetic resin cap according to a seventh embodiment of the present invention.

[Explanation of symbols]

1 ... container opening, 2 ... outer cylinder, 3 ... synthetic resin cap, 4 ... inner peripheral wall, 5 ... first weakening line, 6 ... second weakening line, 7 ……… Outer lid, 8 ……
... hinge, 9 ... ridge, 10 ... ridge.

Claims (6)

[Claims] 1. A synthetic resin cap (3) having an outer cylindrical portion (2) engaged with a container opening (1), wherein the cap (3) has a central angle of 60 degrees or less.
A cap provided with first weakening lines 5 and 5 from the opposing lower end of the outer cylinder portion 2 intersecting the center line of the book to at least the vicinity of the upper end. 2. The cap according to claim 1, wherein in addition to the first weakening lines, a second weakening line similar to the first weakening lines is provided between the first weakening lines. . 3. Each of the weakening lines 5 and 6 is one or more vertical straight lines, inclined straight lines, inclined curved lines from the lower end of the inner peripheral wall 4 of the outer cylindrical portion 2, and straight lines that branch upward from the lower end in two opposite directions. The cap according to claim 1, wherein the cap is formed in a shape or a curved shape that is bifurcated in an opposite direction upward from a lower end. 4. The cap according to claim 1, wherein the first weakening lines 5 and 5 are one or more inclined straight lines or inclined curves, and the inclination angle is 45 degrees or more. 5. The outer cylinder part 2 and the outer lid 7 are connected by a hinge 8, and the first weakening lines 5 and 5 are provided at least 30 degrees apart from both ends of the hinge 8.
Any one of caps 4 to 4. 6. An engagement between the cap 3 and the container opening 1 is achieved by a ridge 9 provided on the inner peripheral wall 4 of the outer cylindrical portion 2 of the cap 3.
The cap according to any one of claims 1 to 5, wherein the cap is engaged with a ridge 10 provided on an outer wall of the container mouth 1.