JP2003054597A - Pilfer-proof cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate removal of a TE band without spoiling virginity confirming function in a pilfer-proof cap leaving the TE band on an opening of a bottle. SOLUTION: A screw lid 2 and the TE band 3 are connected with each other with a narrow first bridge 4 which can be torn off. In the TE band 3, a break allowable means consisting of an upward opened slit 8 and a narrow second bridge 9 is formed. As the second bridge 9 is positioned at the bottom end of the TE band 3, there exists no possibility of expanding and deforming of the TE band 3 when capping is performed and the virginity confirming function is high. As the slit 8 looks up, even when the TE band 3 is got on the lower stage flange A2 of the pilfer-proof cap A, it is possible to lift up the end part 3a of the TE band 3 by a finger top and to simply tear off it.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pill fur proof cap made of synthetic resin. [0002] A pill fur proof cap made of a synthetic resin includes a screw cap and a tapper evidence band (hereinafter referred to as "T
Both are connected by bridges arranged at appropriate intervals along the circumferential direction. [0003] Generally, when the TE band is screwed into the bottle mouth to engage the flange of the bottle mouth from below, the bridge is broken when the screw cap is unscrewed. There are two types of pill fur proof caps: an integrated type in which the TE band is connected to the screw cap even after opening, and a separation type in which the TE band is completely separated from the screw cap and remains in the bottle mouth. . [0005] The former integrated type is excellent in recyclability of caps and bottles (containers), but is inferior in aesthetics.
The disadvantage is that the band gets in the way. In addition, there is a problem in terms of safety, for example, when an infant is playing with the cap after opening, there is a risk that his / her eyes may be cut off with the TE band. On the other hand, the latter separation type is excellent in aesthetics, easiness of recapping and safety.
When recycling the container and the TE band, there was a problem that the work of separating the TE band was troublesome (the material of the TE band is often made of PP resin or PE resin, whereas the container is often made of PET resin. It is necessary to separate them for recycling). In view of the above, it has been proposed that a TE band can be easily cut off after opening in a separation type pill fur proof cap. As an example thereof, a TE band previously divided by a slit (for example, Japanese Patent Application Laid-Open No. 57-28767,
Figure, JP-A-5-16650, JP-A-4-78154, JP-A-6-15
No. 6516, Japanese Patent Application Laid-Open No. Hei 7-12952), a thin band or a perforated cut formed in a TE band (Japanese Patent Publication No. 4-51)
No. 430), and FIG.
As disclosed in FIG. 3 of -28767, there is a type in which a slit 21 having a downward opening is formed in a TE band 20 and both sides of the slit 21 are connected by a bridge 22. Reference numeral 23 in FIG. 7 denotes a screw cap. [0009] Of the above-mentioned prior arts, the prior art is excellent in that the TE band can be easily removed from the bottle mouth, but the TE band expands and deforms upon capping. Therefore, there is a problem that a virginity confirmation function, which is an original purpose of the pill fur proof cap, is uneasy (regardless of whether or not the confirmation function is actually impaired). [0010] On the other hand, there is no problem that the TE band spreads at the time of capping, but it is difficult to visually recognize which part of the TE band has a thin portion or cut.
There is a problem in that it is difficult to hook a fingertip on a TE band, and a considerable force is required to cut a thin portion or a cut portion, which is inferior in ease of opening. On the other hand, in the case of the TE band 20, it is easy to visually recognize which part of the TE band 20 is to be cut off.
Since the bridge 22 is easily torn off, it can be said that the bridge 22 is superior in the prior art. However, if the slit 21 is opened downward and the bridge is positioned at the upper end as in the case, the TE band 20 gives an impression as if it is deformed so as to expand the hem. There is a possibility that the virginity confirmation function may be uneasy. As shown by the solid line in FIG. 7, upper and lower two-stage flanges A1 and A2 are formed in the bottle opening A, and the TE band 20 is engaged with the upper flange A1. Although there is a bottle for hanging the hanging plate B, in this type of bottle, the lower edge of the TE band is hidden by the lower flange A2, so that it is difficult to put a finger on the slit 21 of the TE band 20, so that the TE band is difficult. There is a problem that it is troublesome to tear the band 20 with a fingertip. An object of the present invention is to improve such a situation. A pill fur proof cap according to the present invention is formed under a male screw portion of a bottle mouth (a mouth portion of a container) and a male screw portion of the bottle mouth. A tapper evidence band engaged with the flange and held immovable upward. The screw cap and the tapper evidence band are connected via a plurality of fragile portions which can be shredded so as to be completely separated when the screw cap is unscrewed from the bottle mouth. At an appropriate part of the band, break allowance means including at least an upwardly opened slit and a thin bridge is formed. In the present invention, the term "slit" refers to a state in which both sides of the slit are separated from each other, and the interval is not limited. Therefore, a slit in which both surfaces sandwiching the slit are in close contact or close contact with each other is also included in the slit. In general, the screw cap and the TE band are often integrally molded, but both are manufactured separately, and hook-type engagement, bonding using an adhesive, or ultrasonic waves or the like is used. The connection may be made by welding or the like (in such a case, the engaging portion, the bonding portion, or the welding portion becomes a fragile portion). A bridge is generally used as the fragile portion. In this case, the brittle portion may be formed at the time of molding or may be formed by post-processing using a cutter. According to the present invention, in the separation type cap in which the TE band remains in the bottle mouth after opening, the bridge is T-shaped.
Since the TE band is located below the upper end surface of the E band, it is possible to prevent or suppress the TE band from expanding and deforming at the time of capping, or the user from thinking that the TE band is expanding and deforming. As a result, it is possible to prevent the original function of the pill fur proof cap, which is a virginity confirmation function, from being impaired, or to prevent the user from thinking that the pill fur proof cap is impaired. And, since the slit is open at least upward, even if the lower end surface of the TE band is hidden by the lower flange of the bottle mouth, the fingertip can be easily hooked to the location of the slit to cause the bottle. The TE band can be easily removed from the mouth. Next, embodiments of the present invention will be described with reference to the drawings. (1) First Embodiment (FIGS. 1 to 5) FIGS. 1 to 5 show a first embodiment. 1A is a front view of a bottle (container) such as a PET bottle in a state separated from a bottle mouth A (a state before use), and FIG.
2 is a partially cutaway front view in a capped state (used state), FIG. 2 is a plan sectional view taken along the line II-II of FIG. 1, FIG. 3 is a partial perspective view, and FIG. The bottle mouth A is provided with a male thread portion A4 having a thread A3 formed on the outer periphery, and a small-diameter upper flange A1 and a large-diameter lower flange A2 are formed below the male thread portion A4. [0026] 1. Configuration of Cap The pill fur proof cap 1 includes a screw lid 2 that opens downward and a TE band 3 that is located below the screw lid 2, and both of them have a plurality (at appropriate intervals along the circumferential direction). (Eight) of the first bridges 4. A large-diameter annular recess 5 is formed in the upper inner peripheral surface of the screw lid 2, and a packing 6 is mounted on the recess. This packing 6 is in a state in which it can move relative to the screw cap 2 by a certain dimension in the up and down direction so that the bottle mouth A is kept sealed until the group of the first bridges 4 is broken at the time of opening. I have. The TE band 3 is formed in a tapered shape that spreads slightly downward, and has an inner periphery at its lower end that extends diagonally upward so as to be able to project from below and engage with the upper flange A1 of the bottle opening A. A large number of stop pieces 7 are formed along the circumferential direction. In this case, as shown in FIG. 3 (B), the locking piece 7 is formed in a concave shape upward at a gentle angle. This is because, while increasing the tension force on the upper flange A1 by the rib effect, the upper flange A1 can be easily passed over by being deformed flat during capping. The TE band 3 is provided with a break permitting means comprising a set of one slit 8 opened only upward in a front view and a thin second bridge 9. [0031] When the cap 1 is screwed into the bottle mouth A, the locking piece 7 of the TE band 3 is elastically deformed during the screwing and rides over the upper flange A1. 7 engages with the upper flange A1 from below. In this case, both ends 3a sandwiching the slit 8
Are connected by the second bridge 9 at their lower ends, so that the TE band 3 can be prevented from expanding and deforming.
In addition, since the second bridge 9 is not broken and the sealed state can be visually recognized, it is possible to give a sense of security to a user (a maker of beverages, a store, a consumer, etc.). When the screw cap 2 is unscrewed, only the screw cap 2 rises in a state where the TE band 3 is held so as not to be able to come out upward, so that each first bridge 4 is broken and opened.
After the opening, the TE band 3 remains in the bottle opening A, so that the TE band 3 does not interfere with the resealing and does not impair the beauty. Since the second bridge 9 is formed at the lower end of the TE band 3, even if the TE band 3 is covered with the lower flange A2 from below, as shown by the dashed line in FIG. When the fingertip F is applied to the corner of one of the ends 3a of the band 3 with the slit 8 interposed therebetween and raised toward the user, the second bridge 9 can be easily torn apart. Therefore, labor in recycling the bottle and the TE band 3 can be reduced. [0035] FIG. 5A shows a part of an injection molding die apparatus for manufacturing a cap. The die apparatus includes a screw lid 2 and a TE.
An inner mold (male / core) 10 for molding the inner surface of the band 3;
An outer mold (female mold) 11 for molding the outer surface of the screw lid 2 and a split mold 12 for molding the outer surfaces of the TE band 3 and the first bridge 4
And a stripper plate 13 for protrusion. As shown in FIG. 2, the split mold 12 is divided into two parts, and a narrow first bridge molding cavity 14 is formed between the split mold 12 and the inner mold 10. Then, as shown in FIG. 5A, the slit 8 of the TE band 3 forms an inward projection 12a at an intermediate portion of one split mold 12 and blocks the resin with the inward projection 12a. It is formed. Further, the second bridge 9 has the inward projection 12
The second bridge-forming cavity 15 is formed between the lower end of a and the inner mold 10. Since the slit 8 and the second bridge 9 are located between the adjacent locking pieces 7, the slit 8 and the second bridge 9 do not interfere with the locking piece 7. Therefore, the second bridge 9 can be formed at the lower end of the TE band 3. In this type of mold apparatus, a gate for injecting the molten resin into the cavity is generally provided at the center of the upper end of the outer mold 11 or at the center of the upper end of the inner mold 10. The molten resin is transferred from the narrow first bridge forming cavity 14 to the TE band forming cavity 16.
Flow into Since the pressure of the resin in the narrow first bridge forming cavity 14 is reduced and the cross-sectional area of the second bridge forming cavity 15 is small, the resin is formed in the entire second bridge forming cavity 15. There is a phenomenon that the flow of the resin becomes unstable in the second bridge forming cavity 15, for example, the resin is filled or not filled. As a result, as shown in FIG. 2 and FIGS. 5B and 5C, the second bridge 9 is completely formed with the same width as the second bridge forming cavity 15, or the second bridge 9 is formed. Or smaller than the width of the cavity 15. When the flow of the resin is incomplete, the second bridge 9 shifts inward or outward in the radial direction due to a difference in the situation. However, when the inventors of the present invention conducted experiments, it was found that the second bridge 9 did not break during capping even when the resin flow was incomplete as shown in FIG. 5C, for example. Rather, it has been found that there is an advantage that the shredder after opening can be easily performed. That is, by setting the cross-sectional area of the second bridge molding cavity 15 to be somewhat large in anticipation of the uncertainty of the flow of the resin, the flow of the resin becomes complete or incomplete. Even if it is loose, the second bridge 9 can be formed so as not to be broken at the time of capping and to be easily broken after opening. Although the above description has been made as to injection molding,
The same applies to pressure molding (compression molding). (2) Another Embodiment (FIG. 6) FIG. 6 shows another embodiment (modification). In (A), the second bridge 9 is formed at an intermediate height of the TE band 3. In other words, the slit 8 on the front
Are opened upward and downward. In the embodiment shown in (B), the second bridge 9 is arranged at the lower end, and the slit 8 is formed in a V-shape. In the embodiment shown in (C), the slit 8 is inclined with respect to the axis of the cap. As can be easily guessed from these (B) and (C), the slit 8 may have any shape. Further, a plurality of second bridges 9 may be provided. (3) Others The present invention can be variously embodied in addition to the above embodiment. For example, various types of locking means for locking the TE band to the bottle mouth can be adopted. Further, it is also possible to provide a plurality of separation permitting means composed of pairs of slits and bridges along the circumferential direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a first embodiment before use and a partially broken front view during use. FIG. 2 is a cross-sectional plan view taken along the line II-II of FIG. 1, showing a manufacturing mold indicated by a lower layer line. FIG. 3 is a partial perspective view. FIG. 4 is a diagram showing an operation. FIG. 5A is a cross-sectional view showing a part of a manufacturing apparatus, and FIG.
(C) is a top view which shows the dispersion | variation in shaping | molding of a 2nd bridge. FIG. 6 is a diagram showing another embodiment. FIG. 7 is a diagram showing a conventional example. BRIEF DESCRIPTION OF THE DRAWINGS 1 pill fur proof cap 2 screw cap 3 TE band 3a TE band end 4 second bridge 7 locking piece 8 slit constituting break permitting means 9 second bridge constituting break permitting means

Claims (1)

Claims: 1. A screw cap which is screwed into a male screw portion of a bottle mouth (mouth portion of a container), and which cannot be moved upward by engaging with a flange formed below the male screw portion of the bottle mouth. The screw cap and the tapper evidence band are connected to each other through a plurality of fragile parts that can be shredded so that the screw cap is completely separated when the screw cap is unscrewed from the bottle mouth. A pill fur proof cap, wherein a break permitting means including at least an upwardly opened slit and a thin bridge is formed at an appropriate portion of the tapper evidence band.