JP2001122302A - Pilferproof cap made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure reliable tearing of a bridge in unsealing a pilferproof cap without deteriorating easiness to release from a mold in molding and easiness to screw onto a bottle mouth in packaging. SOLUTION: Numerous locking pieces 7 arranged along a circumferential direction are formed on an internal surface of a tamper-evident(TE) band 3. A region except a base 7a of each locking piece 7 is cut along the circumferential direction and is formed to be non-flat as a radially outward protrusion. Since the base 7a of the piece 7 is flat, the piece 7 can easily deform in a direction where it overlaps on the TE band 3 when it is released from a mold or screwed. When unscrewing a cap, the piece 7 strongly supports against a flange A2 of a bottle mouth A by rib effects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pill fur proof cap made of synthetic resin.

[0002]

2. Description of the Related Art As is well known, a pill fur proof cap made of a synthetic resin is provided with a TE band (tapper evidence band) at a lower end of a screw lid having a downward opening screwed into a bottle mouth through a bridge portion which can be shredded. Connect and T
A locking piece is provided on the inner surface of the E-band so as to be able to come into contact with the flange formed at the bottle mouth from below.

When the cap is screwed in the packaging process, the locking piece passes through the bottle opening flange without any trouble due to elastic deformation. When the screw cap is unscrewed for opening, the locking piece is moved downwardly to the bottle opening flange. If the TE band cannot be lifted, the bridge is broken and the fact that the band has been opened remains.

[0004] This pill fur proof cap has the ease of screwing in that the locking piece of the TE band easily passes through the flange of the bottle mouth during the packaging process, and ensures that the locking piece is securely attached to the flange of the bottle mouth when unscrewed. It is necessary to have a certainty of bridge breakage, in which the bridge is surely cut off by holding, and ease of molding that facilitates die-cutting when manufacturing using a mold. To satisfy these conditions, TE is required.
Numerous proposals have been made for band locking pieces.

For example, Japanese Utility Model Publication No. 57-9240 discloses that a large number of locking pieces formed in a plate shape having a small width are provided at a lower end edge of a TE band at intervals in a circumferential direction. It is described that the locking pieces are formed so as to extend obliquely downward, and each of the locking pieces is bent obliquely upward by screwing the cap into the bottle mouth and locked to the flange of the bottle mouth. I have.

In Japanese Patent Publication No. Hei. 2-0023 and Japanese Patent Laid-Open Publication No. Hei 6-99999, a locking piece is formed so as to extend in a ring shape, and this is integrally connected to the lower edge of the TE band. In this case, it is described that the annular locking piece is formed so as to extend downward or diagonally downward, and then is folded back so as to extend diagonally upward.

Further, Japanese Patent Application Laid-Open No. 7-41023 discloses that
When the locking piece is formed to extend in a ring shape and is extended obliquely upward, and is integrally connected to the lower edge of the TE band, it projects radially inward from the leading edge of the locking piece. It is described that the formed tab is bent.

[0008]

As a mounting form of the locking piece, there is one in which the base of the locking piece extends in the axial direction of the TE band. In this type, the locking piece is mainly formed in the radial direction. To bend.

[0009] Although the locking piece is bent in the radial direction as described above, although it is easy to mold, it is easily deformed when a vertical force is applied. The phenomenon that the bridge is pulled up with the TE band without breaking the bridge frequently occurs due to the low resistance to tension.

[0010] On the other hand, in each of the above-mentioned prior arts, the connecting portion between the locking piece and the TE band extends in the circumferential direction (horizontal direction), and the locking piece is centered on the base thereof. Since the bottle is rotated up and down, the resistance of the bottle mouth to the flange is large, and therefore, the reliability of the bridge breaking can be improved.

In particular, when the locking piece is formed in an annular shape extending long in the circumferential direction as disclosed in JP-A-6-99999 and JP-A-7-41023, the rigidity of the locking piece is remarkably improved. The striking resistance can be significantly improved,
Further, if a tab is protruded from the locking piece as disclosed in Japanese Patent Application Laid-Open No. 7-41023, it is possible to more securely catch the bottle mouth on the flange.

However, when the locking piece is formed in an annular shape, there is a problem that the screwing resistance when the cap is screwed into the bottle mouth increases. In addition, when the locking piece is formed in a posture extending obliquely upward, there is also a problem that resistance when the die is removed by so-called forcible removal is large, and the durability of the mold is low.

An object of the present invention is to provide a pill fur proof cap which has solved these problems.

[0014]

According to the present invention, there is provided a screw cap having a downward opening which is screwed into a bottle mouth having an external thread and a flange formed on an outer periphery thereof and vertically separated from each other, and a bridge portion which can be cut off at the lower end of the screw cap. In a non-cap having a TE band connected through a, a locking piece extending obliquely upward so as to be able to abut against the flange of the bottle mouth from below, on the inner peripheral surface or the lower edge of the TE band, A large number of parts are formed in a state of being scattered along the circumferential direction, and an appropriate portion of each of the locking pieces excluding the base is formed in a non-flat shape such as a radial inward or radial outward convex in plan view. The feature is that it is formed in.

In the present invention, it is preferable that each locking piece is formed to have substantially the same thickness dimension as a whole, but the thickness may be different, for example, it may be formed so as to become thicker toward the leading edge.

[0016]

According to the structure of the present invention, the locking piece is formed to have a radially inwardly convex or radially outwardly convex shape in plan view, so that the locking piece is Since the rigidity against the force from above is remarkably improved, when the cap is unscrewed from the bottle mouth, the tension resistance against the flange of the bottle mouth can be greatly improved. That is, while the locking pieces are divided into many pieces, the reliability of the bridge breaking can be ensured.

Further, since the locking piece is easily deformed when a force from the inside of the radius is applied, when the cap is screwed into the bottle mouth, it is easily deformed so as to overlap the inner surface of the TE band, and therefore, the screwing is easy. Sex is not impaired.

Further, since a large number of locking pieces are formed in a divided state, when the locking pieces are formed in a posture extending obliquely upward, the locking pieces are formed into an annular shape extending long in the circumferential direction. Compared to the case of forming, it is easier to remove the mold by separating the mold by elastically deforming the locking piece,
As a result, the durability of the mold can be improved.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings.

(1) First Embodiment (FIGS. 1 to 4) FIGS. 1 to 4 show a first embodiment, in which FIG. 1 is partially broken away from a bottle mouth A. Front view, FIG. 2
Among them, the dividing diagram (A) is a sectional view taken along the line IIA-IIA of FIG. 1, the dividing diagram (A) is a sectional view taken along the line BB of the dividing diagram (A), and FIG. It is sectional drawing.

The cap 1 has a screw lid 2 opened downward.
And a TE band (ring portion) 3 located below the screw cover 2 and the TE band 3 are integrally connected to each other by bridges 4 arranged at intervals at appropriate intervals along the circumferential direction. ing.

Although it is needless to explain, an inner screw 5 is formed on the inner peripheral surface of the screw lid 2 to be screwed with the male screw A1 formed in the bottle opening A. The inner screw 5 is divided by an appropriate number in the circumferential direction. A packing 6 is fitted in the upper end of the screw lid 2 so as to be vertically movable.

In the present embodiment, the outer diameter and the inner diameter of the TE band 3 are set to almost the same dimensions as those of the screw cap 2.
On the lower edge of the TE band 3, a large number of locking pieces 7 extending obliquely upward are formed along the circumferential direction so as to be arranged at appropriate intervals.

The locking pieces 7 are set to have substantially the same thickness as a whole, and as clearly shown in FIG. 2, the base 7a of each locking piece 7 extends horizontally along the circumferential direction. , Flat. The leading edge 7b of the locking piece 7 is curved in an inwardly convex arc shape in a plan view. For this reason, the locking piece 7 has a concave groove 7c whose groove width decreases toward the base 7a. Is formed. In addition, the concave groove 7c is an expression when viewed from above, and is expressed as a projection when viewed from below.

On the lower end surface of the TE band 3, there is formed a groove 8 which extends in a ring shape as if dug along the base 7a of the locking piece 7. Therefore, the locking piece 7 can be easily deformed downward. It is sufficient that the groove 8 is formed only at a position corresponding to the locking piece 7.

Since the width of each of the locking pieces 7 is small, the base 7a of each of the locking pieces 7 is close to a straight line in plan view. It can be easily bent up and down around the center. In addition, each locking piece 7
In other words, the TE band 3 can be easily deformed into a state in which the TE band 3 is crushed flat.

Since the locking pieces 7 can be easily bent and easily crushed and deformed, the screw cap 2 is screwed into the bottle mouth after filling the contents into the container in the packaging step. As shown by the dashed line in FIG. 2B, each locking piece 7 abuts on the flange A2 of the bottle mouth A and is easily deformed. Therefore, a situation in which the TE band 3 cannot rotate and the bridge 4 is broken does not occur, and the cap 1 can be securely screwed into the bottle opening A and mounted.

When the cap 1 is unscrewed for opening, the leading edge of each locking piece 7 comes into contact with the flange A2 of the bottle opening A from below. As shown by a white arrow B, a force acting to crush the locking piece 7 in a direction opposite to the extending direction of the locking piece 7 acts on the locking piece 7. Because of the rib effect, that is, since the section coefficient of the locking piece 7 with respect to an external force from the direction of the white arrow B increases, each locking piece 7
Are strong against external force from the direction of the white arrow B and are not easily deformed.

For this reason, when the cap 1 is unscrewed and opened, each locking piece 7 securely projects against the flange A2 of the bottle opening A, and the bridge 4 is securely cut.

If the locking piece 7 is simply a flat plate, the locking piece 7 is lowered below the flange A2 in the bottle opening A by screwing during packaging.
Is deformed so as to bend in a direction overlapping with the inner surface of the TE band 3, and the restoration to the original posture is insufficient.
There is a possibility that the engagement of the locking piece 7 with the flange A2 becomes insufficient.

On the other hand, in the present invention, the locking piece 7 is
Since the restoring force for returning to the original posture becomes large even if it is deformed during screwing in packaging, it is possible to surely catch the locking pieces 7 on the flange A2 of the bottle opening A.

Next, an example of an apparatus for forming the cap 1 will be described with reference to FIG. As shown in FIG. 4A, the molding apparatus includes a first mold 11 for forming the outer surface of the screw cap 2 and a second mold 12 for forming the inner surface of the cap 1. And a third mold 13 for forming the lower surface of the locking piece 7 and the groove 8, a stripper plate 16, and a fourth mold 14 for forming the bridge 4.

The second mold 12 is slidably fitted to the third mold 13, and the third mold 13 is fitted to the stripper plate 16. A projecting pin 17 is slidably fitted in the second mold 12. The first mold 11 to the third mold 13 are the cap 1
The fourth mold 14 is movable in the axial direction of
It is a split type that moves in the direction perpendicular to the axial direction of
In addition, TE band 3 at the inner periphery of stripper plate 16
The lower end is supported.

As shown in FIG. 3A, with each mold 11... Advanced, molten resin is injected into the cavity from the gate 18 of the first mold 11, and after the resin is solidified, First,
The first mold 11, the third mold 13, and the fourth mold 14 are retracted to the state shown in the drawing (B), and then the second mold is kept with the protruding pin 17 kept in contact with the screw lid 2. The mold 12 is retracted. Then, the second mold 12 is pulled out of the cap 1 by forcible removal for elastically deforming the screw lid 2 and the locking piece 7.

In this case, since the locking pieces 7 are separated into a large number, the resistance of the die is smaller than that of the case where the locking pieces 7 are annular.
Can be prevented or significantly suppressed, and the durability of the mold can be improved. Further, since the locking piece 7 has a curved cross-sectional shape, the elastic restoring force after the die is released is large,
It is easy to return to the posture extending obliquely upward.

Note that, even if the return deformation of the locking pieces 7 is insufficient due to deformation at the time of die removal, each locking piece 7 is pushed in the direction of the screw cap 2 when the packing 6 is inserted. At the time of use, the posture can be extended obliquely upward.

In the second mold 12, the inner surface of the screw cap 2 is formed, and the inner surface of the TE band 3 and the upper surface of the locking piece 7 are formed by a fifth mold 15 shown by a dashed line in the drawing A. (In that case, the fifth mold 15 is retracted and then the second mold 12 is retracted, so that the resistance of the die cutting can be reduced).

(2) Other Embodiments (FIGS. 5 to 7) FIGS. 5 to 7 show other embodiments. In the second embodiment shown in FIG. 5, the TE band 3 is arranged outside the screw lid 2 in the radial direction. In this example, the first mold 11 uses T
The outer surface of the E-band 3 is also formed, and the bridge 4 is formed by the second mold 12. In this example, since the split fourth mold 14 as shown in FIG. 4 is not required, there is an advantage that the structure of the molding apparatus can be simplified.

In this example, the tip of the locking piece 7 is hooked at the upper end of the third mold 13, so that the locking piece 7 is moved downward to some extent by the retreat of the third mold 13. This has the advantage that the die-cutting resistance when the second mold 12 is retracted can be reduced. When the inner peripheral surface of the TE band 3 is formed in a tapered shape whose diameter increases downward,
Die removal resistance can be further reduced.

FIG. 6 shows a third example of another embodiment of the locking piece 7.
1 shows an embodiment. In the example shown in FIG. 5A, flat portions remain on both ends of the leading edge 7b of the locking piece 7 across the concave groove 7c. As shown by the one-dot chain line in FIG. 5A, if a hole 19 is provided at the base 7a of the locking piece 7, the resistance at the time of die removal can be further reduced.

In the example shown in FIG. 5B, an upward projection 7d is formed on the locking piece 7 so that the front edge 7b is formed to be inwardly convex. In this case, flat portions remain on both sides of the leading edge 7b across the projection 7d.
The entirety of b may be curved convexly outward.

In the example shown in FIG. 5C, the leading edge of the locking piece 7 is formed in a mountain shape and is formed to be convex toward the inside of the radius (the shape may be convex toward the outside of the radius). ). In the example shown in the drawing (D), ribs 7e are formed on both side edges along the extending direction of the locking piece 7.

The number of the ribs 7e is not limited to two, but may be three or more as shown by an alternate long and short dash line, or may be one. Preferably, the rib 7e is formed to be inclined with respect to the main body of the locking piece 7 (because the rib 7e is easily deformed when screwed).

The provision of the ribs 7e as shown in FIG.
The present invention can also be applied to a case where the locking piece 7 is formed in an annular shape extending in the circumferential direction (in this case, the locking piece 7 does not need to be completely continuous along the entire circumference of the TE band 3 and is divided into three parts. Or it is preferable to divide it into an appropriate number such as four.)

(3) Others The present invention can be variously embodied in addition to the above embodiment. For example, the bridge 4 is not limited to being formed at the time of molding, but may be formed by cutting a peripheral wall of the screw lid 2 with a cutter.

The present invention is also applicable to a case in which the screw cap and the TE band are formed separately and integrated by means such as fitting or bonding. Further, the locking piece may be formed obliquely downward or horizontally and horizontally, and may be bent obliquely upward in a later step.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a cap according to a first embodiment.

2A is a sectional view taken along the line IIA-IIA of FIG. 1, and FIG. 2B is a sectional view of FIG.
It is BB sectional drawing.

FIG. 3 is a front sectional view in a state of being screwed into a bottle mouth.

FIG. 4 is a sectional view of a molding apparatus.

FIG. 5 is a partial sectional view of the second embodiment.

FIG. 6 is a diagram showing a third embodiment.

[Explanation of symbols]

 A Bottle mouth A2 Flange 1 Cap 2 Screw lid 3 TE band 4 Bridge 7 Locking piece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E084 AA04 AA12 BA01 CA01 CC03 DA01 DB05 DB12 DC03 FA09 FB01 GA04 GB04 GB08 HA10 HB03 HD01 HD04 KA13 LA05 LA17

Claims (1)

[Claims] 1. A screw cap having a downward opening which is screwed into a bottle mouth having a male screw and a flange formed on an outer periphery thereof and vertically separated from each other, and a TE band connected to a lower end of the screw cap via a bridge portion which can be shredded. A locking piece extending obliquely upward so as to be able to abut against the flange of the bottle mouth from below is arranged on the inner peripheral surface or lower end edge of the TE band, in a row along the circumferential direction. A large number of parts are formed in a state, and appropriate portions except for the base of each of the locking pieces are formed in a non-flat shape such as a convex inward in a radial direction or a convex in a radially outward direction in plan view, made of synthetic resin. Pill fur proof cap.