JPH11105904A - Plastic cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to curve uniformly, prevent a large partial bend or the like, make a reverse turn smooth, and make the reverse turn and capping steady, by giving a plurality of stress-lessening parts, in which quadrangular holes and flat-quadratic-prism-shaped recesses are formed one after another in an area extending from the root of a locking ring to the peripheral edge of its front end. SOLUTION: The plastic cap 1 comprises a guarantee ring 12 continuing, via a bridge 10b, to the lower part of the cylindrical portion of a cap main body 10, and a skirtlike locking ring 12 extending downward from its peripheral edge. Also it is given a plurality of stress-lessening parts 30, in which quadrangular holes 30a and flat-quadratic-prism-shaped recesses are formed one after another in an area extending from the root 20a of the locking ring 20 to the peripheral edge 20b of the front end of it. Thus, in the peripheral edge 20b of the front end of the locking ring 20, quadrangular cuts by the flat-quadratic- prism-shaped recesses are made, and a part whose width is thinner than the width of the peripheral edge 20b of the front edge is formed. It lessens a stress applied when the locking ring 20 is turned reversely, increases the degree of freedom in curvature in reverse turn, and makes it easy to curve uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic cap for plugging a plastic container, a glass bottle, or the like, and more particularly to a plastic cap having a locking function for a security ring connected to a cap body.

[0002]

2. Description of the Related Art Conventionally, a cap made of aluminum or the like has been used as a cap for a plastic container or a glass bottle. One of the caps is to clearly indicate that the cap is to be opened. Caps with security rings connected by bridges are known.

However, the above-mentioned metal caps made of aluminum or the like have a problem that, for example, when the customer opens the cap, they may be injured by the security ring or the like. In recent years, the security ring has the same kind of function. A plastic cap provided with a locking function is known and used.

As an example of this plastic cap with a lock function, as shown in FIG.
The security ring (12) connected to the lower end of the cylindrical portion of the above (0) via a bridge (10b) and the periphery (10) of the security ring.
a) A skirt-shaped locking ring hanging from (a)
0) In the plastic cap (1) to be provided, as shown in FIG. 6 (a), two vertical slits (22) for extending from the base (20a) of the ring (20) to the peripheral edge (20b). And a plastic cap provided with a plurality of stress relaxation portions (30) on the ring (20).

[0005] Further, the stress relaxation portion (30) is provided in FIG.
As shown in (b), a stress relief portion in which a square hole (30a) and a flat wedge-shaped recess (30c) are formed in order from the base (20a) of the locking ring (20) to the peripheral edge (20b). The plastic cap (1) having (30).

In such a plastic cap with a locking function, the state of the locking ring (20) immediately after molding is, as shown in FIG.
The locking ring (20) is in a state (A), which is hung down in (a), and is turned upside down after molding, and is in a state (D) after being inverted through a horizontal state (B) in the middle of inversion. Further, after filling the contents of the container, the step of plugging the container extraction port (6) while rotating the plastic cap clockwise, that is, over the fogger with the locking ring (20) completely inverted, and thereafter, It returns slightly to the locked state (C), and rotation in the counterclockwise direction becomes impossible. When opening the plastic cap (1), when the plastic cap is rotated counterclockwise, the locked security ring (12) is connected to the bridge (10).
b), which breaks off from the cap body (10) and remains in the extraction port (6) of the container, and is a mechanism that clearly indicates that the plastic cap has been once opened. is there.

[0007]

However, in the above-mentioned conventional plastic cap with a lock function, at the stage of plugging the container extraction port (6), two semicircular arc-shaped lock rings (20) are used. In the horizontal state (B) in which the waist is too strong and the inversion is difficult, and the inversion is in progress, FIG.
As shown in (a), two vertical slits for division (22)
However, there is a problem that the two locking rings (20) subjected to (1) interfere with each other to cause an overlap (R), and it is difficult to turn over.

Further, due to problems such as the shape of the plurality of stress relief portions (30) provided on the locking ring (20),
At the time of plugging, during the reversal of the lock ring (20), as shown in FIG.
Since the stress is partially concentrated in the area, a large bend (S) occurs partially, resulting in non-uniform reversal. The bridge (10b) is broken at the time of reversal and filling, and capping failure occurs in the automatic stoppering machine. And so on.

The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a security ring (10) connected to a lower portion of a cylindrical portion of a cap body (10) via a bridge (10b). 12) A plastic cap with a locking function, comprising a skirt-shaped locking ring (20) hanging from the periphery (10a) of (12).
When the locking ring (20) is turned over, or after filling the container with the contents, the plastic ring is rotated while plugging the container extraction port (6). An object of the present invention is to provide a plastic cap (1) which can be smoothly and uniformly turned over and which can be easily plugged without occurrence of overlapping or large partial bending at a portion (22).

[0010]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided a method for connecting a cap body (10) below a tubular portion of a cap body (10) via a bridge (10b). In a plastic cap (1) provided with a security ring (12) and a skirt-shaped locking ring (20) that hangs down from the circumference (10a) of the security ring, a tip edge from the base (20a) of the locking ring (20). A plastic cap (1) characterized by being provided with a plurality of stress relaxation portions (30) in which a square hole and a flat rectangular column are formed in order over (20b).

According to the invention of claim 2, the locking ring (20) has four 90 ° split vertical slits (2) extending from the base (20a) to the peripheral edge (20b).
The plastic cap (1) according to claim 1, wherein the plastic cap (1) is applied.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, FIG. 1 is a side view and a side cross-sectional view showing a state in which a locking ring of a plastic cap of the present invention before molding and closing a container is hung on the periphery of a security ring, and FIG. FIG. 7 is a side view and a side cross-sectional view showing a locked state where the side view is reversed.
3 (a) and 3 (b) are top views showing the state of the locking ring of the plastic cap of the present invention. FIGS. 3 (c) and 3 (d) show the stress applied to the locking ring. It is an enlarged view explaining the state of a relaxation part.

As shown in FIG. 1, the plastic cap of the present invention has a security ring (12) connected via a bridge (10b) below the cylindrical portion of the cap body (10).
And a plastic cap having a skirt-shaped locking ring (20) hanging down from the periphery of the security ring (12), as shown in FIG. 3 (c), from the base (20a) of the locking ring (20) to the tip. Perimeter (20
b) a plurality of stress relaxation portions (30) in which a square hole (30a) and a flat square columnar recess (30b) are formed in order.
2, the locking ring (20) is locked by turning the locking ring (20) upside down and plugging the container extraction opening (6) as shown in FIG. is there.

The stress relaxing portion (30) having the above-mentioned shape.
Is applied to the locking ring (20), and as shown in FIG.
Can be cut into a rectangular shape by a flat quadrangular pyramid-shaped concave portion (30b) at the distal end edge (20b) of the, and a width portion (H) thinner than the width (W) of the distal end edge (20b) can be formed. The stress at the time of reversal is relaxed, the degree of freedom in bending at the time of reversal is increased, and it becomes easy to bend evenly. Can be stably performed.

The number of the stress relief portions (30) varies depending on the size of the plastic cap, and is not particularly limited.
In the case of the plastic cap (1) having a diameter of 32.5 mm, the locking ring (20) is divided into four parts.
About 3 to 5 pieces per sheet, a total of about 12 to 20 pieces is a preferable number.

As shown in FIG. 3A, the locking ring (20) is provided with four vertical slits (22) extending from the base (20a) to the peripheral edge (20b). Plastic cap
At the time of inversion and after filling the contents of the container, when the plastic cap is rotated clockwise when plugging the container extraction opening, the waist of the four-part locking ring (20) is softened, and FIG. As shown in (b), in the horizontal state during the reversal, the locking rings (20) do not interfere with each other, no overlap or the like occurs, and the reversal can be performed smoothly, and the reversal and plugging can be performed stably. .

Further, by providing the locking ring (20) with a square hole (30a), a flat quadrangular pyramid-shaped concave portion (30b) and four vertical slits for division (22), the amount of resin used can be reduced. It is possible to provide a plastic cap that is superior in economy and environmental performance (waste problem, etc.).

The plastic cap having the lock function is manufactured by appropriately selecting from an injection molding method or a compression molding method, and the resin used is appropriately selected from high-density polyethylene, polypropylene, or the like. is there.

[0019]

As described above, the present invention has the following effects. That is, in a plastic cap having a skirt-shaped locking ring that hangs from the periphery of the security ring of the security ring connected to the lower end of the cylindrical portion of the cap body via a bridge, a square shape is formed from the base of the locking ring to the peripheral edge of the tip. Since a plurality of stress relieving portions in which the hole and the flat quadrangular prism-shaped concave portion are formed in order are applied, at the time of reversing and when plugging after filling the contents, the stress at the time of reversing the locking ring is relieved, and it is easy to bend evenly. As a result, large partial bends and the like as in the prior art are eliminated, and smooth inversion is performed, so that inversion and plugging can be performed stably.

Further, since the locking ring is provided with four vertical slits extending from the base of the locking ring to the periphery of the tip, after filling the contents into the container, the plastic cap is rotated and then plugged into the container extraction opening. When the lock ring is turned over, the lock ring divided into four parts can be softened at the waist, and the lock rings do not interfere with each other, so that there is no overlap, etc. Can be performed more stably, and a plastic cap free from occurrence of defective capping in an automatic stoppering machine at the time of reversal can be obtained.

Further, by providing a triangular hole, a triangular pyramid-shaped concave portion, and four vertical slits for division on the locking ring, the amount of resin used can be reduced, and the economy and environmental performance (waste) can be reduced. Problems, etc.) can be used as the plastic cap.

Therefore, the present invention exhibits an excellent practical effect in a plastic cap with a lock function having a lock ring for checking whether or not a cap such as a plastic container has been opened once.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view and a side sectional view showing a state in which a locking ring of a plastic cap according to an embodiment of the present invention before molding and closing a container is hung on a cap body.

FIGS. 2A and 2B are a side view and a side sectional view showing a state in which a locking ring is inverted in a plastic cap according to an embodiment of the present invention.

FIGS. 3A and 3B are views for explaining a locking ring provided in the plastic cap of the present invention, and FIG. 3A is a bottom view thereof. (B) is a bottom view of the horizontal state during the inversion. (C) is an enlarged perspective view of the state of the stress relieving portion applied thereto as viewed from the inside of the locking ring. (D)
FIG. 3 is an enlarged sectional view as viewed from the periphery of the tip.

FIG. 4 is a side sectional view for explaining an inverted state of a locking ring provided on a plastic cap according to the present invention.

FIG. 5 is a side view and a side sectional view for explaining one embodiment of a conventional plastic cap with a lock function according to the present invention.

FIG. 6 illustrates an example of a conventional locking ring of a plastic cap with a locking function according to the present invention, and FIG. 6 (a) is a bottom view illustrating a dividing vertical slit thereof. (B) is an enlarged perspective view explaining the stress relaxation part seen from the inside of the lock ring.

FIG. 7 illustrates an example of a conventional locking ring of a plastic cap with a locking function according to the present invention, and FIG. 7 (a) is a bottom view illustrating a state of a vertical slit for division when inverted. is there. (B) is a perspective view explaining the state of partial bending at the time of the inversion.

[Explanation of symbols]

 1 plastic cap 6 container extraction opening 8 packing 10 cap body 12 guarantee ring 10a perimeter of guarantee ring 10b bridge 10c horizontal score 20 locking ring 20a {Root of locking ring 20b} Peripheral edge of locking ring 22} Vertical slit 30 for splitting 30} Stress relief portion 30a {Square shaped hole 30b} Flat square pillar-shaped recess 30c {Flat wedge shaped recess A}状態 Hanging on the periphery of the cylindrical part B 水平 Horizontal state during inversion C ‥‥ Locked state D ‥‥ Completely inverted state H ‥‥ Thin width around the tip edge of the locking ring W ‥‥ Width of the tip edge R ‥‥ Overlap of the lock ring S ‥‥ Bend

Claims (2)

[Claims] 1. A plastic cap having a security ring connected to a lower end of a cylindrical portion of a cap body via a bridge and a skirt-shaped locking ring hanging from a peripheral edge of the security ring. A plastic cap characterized by applying a plurality of stress relaxation portions in which a square hole and a flat rectangular column-shaped concave portion are formed in order around the distal end edge. 2. The plastic cap according to claim 1, wherein the locking ring is provided with four vertical slits for 90 ° division extending from the base to the peripheral edge of the tip.