JP2004268952A - Unsealing history indicating band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unsealing history indicating band capable of enhancing the quality assurance function of the content in a container with a small bridge-breakage angle. <P>SOLUTION: The unsealing history indicating band has a circumferential shape, and is provided on a lower end of a skirt part of a screw-fitting type cap via a breakable bridge. A plurality of flap pieces directing inwardly and upwardly or horizontally are provided on an inner surface of the band in a circumferential manner at predetermined intervals. Each flap piece is formed in a shape so that the length of a center part 17b in the circumferential direction at a tip part of each flap piece from the inner surface of the band is larger than the length of both end parts 17a in the circumferential direction from the inner surface of the band. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an opening history indicating band provided on a screw-attachable cap.
[0002]
[Prior art]
A screw mounting type cap mounted on a container mouth by screw engagement is widely used for various applications. In addition, in order to guarantee the quality of the contents of the container and prevent tampering, a band indicating the opening history (hereinafter sometimes referred to as a TE band) is attached to almost all screw-mounted caps. As a band, a band in which a plurality of inward and upwardly directed flap pieces are provided circumferentially at predetermined intervals on an inner surface of the band is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-104480 (FIGS. 1 and 2)
[0004]
In a cap having a TE band as described above, the cap rises when the cap screwed to the container mouth is turned in the opening direction, but the tip of the flap piece of the TE band is Abutment on the lower surface of the locking projection, the rise of the TE band is limited, and by rotating the cap, the bridge connecting the cap and the TE band is broken, and as a result, the bridge is removed from the container opening. The TE band will be separated from the removed cap. That is, the fact that the TE band has been separated from the cap clearly indicates that the cap has been opened from the container opening.
[0005]
[Problems to be solved by the invention]
In the TE band applied to the screw-attachable cap described above, in order to secure an excellent opening history indicating function, a cap turning angle (hereinafter simply referred to as a bridge cutting angle) until a bridge connecting the TE band and the cap is broken. Needs to be reduced. That is, since the cap rises along the container opening at the same time as the cap starts turning in the opening direction, the large bridge breaking angle means that the cap is raised until the bridge is broken and the TE band is separated from the cap. It means that the distance is long. If this rising distance is long, the seal of the container opening by the cap is opened before the bridge is broken, and it is determined that the seal is not opened based on the fact that the TE band is not separated from the cap. This is because the reliability of the quality assurance function of the contents of the container is reduced.
[0006]
Conventionally, in order to reduce the angle at which the bridge of the TE band is cut, attempts have been made to form a bridge connecting the TE band with a resin having low elongation or to easily break the bridge itself. In the TE band as shown in (1), there is a limit in reducing the bridge break angle, and at present, it is desired to further reduce the bridge break angle.
[0007]
Therefore, an object of the present invention is to provide an opening history indicating band having a small bridge breaking angle and an improved quality assurance function of container contents.
[0008]
[Means for Solving the Problems]
The present inventors have studied in detail the bridge breaking angle of the opening history clear band provided with the flap piece, and as a result, the tip shape has a large effect on the bridge breaking angle, the flap piece, the center of the tip portion, The present inventors have found that the bridging angle can be reduced by shaping the band so that the length from the inner surface of the band is longer than the length of the both end portions from the inner surface of the band.
[0009]
That is, according to the present invention, in a circumferential opening history indicating band provided in the lower end of the skirt portion of the screw-mounted cap via a breakable bridge,
On the inner surface of the band, a plurality of flap pieces that are directed inward and upward or in the horizontal direction are provided circumferentially at predetermined intervals. Is formed in a shape in which the length from the inner side of the band is longer than the length from the inner surface of the band at both ends in the circumferential direction.
[0010]
In the opening history indicating band (referred to as TE band) of the present invention, the length of the tip end of each flap piece from the band inner surface at the center in the circumferential direction is 0.1 mm smaller than the length from the band inner surface at both ends in the circumferential direction. It is preferably set to be 1 to 0.7 mm longer.
[0011]
The screw mounting cap with the TE band is integrally formed with the TE band by injection molding or compression molding. At this time, the flap pieces of the TE band are directed inward and downward or horizontally. The flap pieces in the downward direction are turned upward by predetermined post-processing or at the time of capping (attachment to the container mouth), and the horizontal flap pieces are deformed upward at the time of capping. Further, the flap piece, as clearly shown in FIG. 2 of Patent Document 1 described above (in FIG. 2, 6 is a flap piece), extends from the circumferential surface of the inner surface of the cap over the entire width direction. It is formed in a shape that makes the uniformity. However, in a flap piece of such a shape, the folded line when turned upside down is not an arc-shaped curve along the circumferential surface of the inner surface of the cap, but a straight line connecting both ends of the flap piece. As a result, the center portion of the tip of the flap piece has a concave shape from both ends of the tip.
[0012]
Therefore, in the conventional TE band, at the time of opening, both ends of the tip of the flap piece first contact the lower surface of the band locking projection of the container mouth, and then the center of the tip contacts. However, since the effective force point for causing the bridge break is located at the center of the tip of the flap piece, the effective point of force for the bridge break is formed in the flap piece having a concave center portion at the tip. Need for unnecessary rotation, which hinders the reduction of the bridge break angle. Furthermore, when capping the cap provided with such a TE band, the center of the tip of the flap piece passes over the band locking projection of the container mouth, and finally both ends of the tip of the flap piece are attached to the band of the container mouth. It will get over the locking projection. Therefore, a predetermined clearance is provided between both end portions of the flap piece tip and the lower surface of the band locking convex portion of the container mouth, and the height difference between the both end portions of the flap piece tip and the center portion is reduced by the bridge break. Therefore, the clearance becomes useless, and also in this point, it is prevented that the bridge cutting angle is reduced.
[0013]
However, according to the present invention, since the length from the center of the band at the center of the tip portion is longer than the length from the inner surface of the band at both ends, the tip of the flap piece is formed. The length from the folding line can be made equal at both end portions and the center portion. For example, both end portions and the center portion of the flap piece tip portion are located on the horizontal line, and as a result, the effective force point for breaking the bridge is cut. Are formed immediately, and the formation of useless clearance can be avoided, so that the bridge breaking angle can be reduced, for example, about 30 degrees. The length of both ends or the center of the flap piece tip from the inner surface of the band refers to the shortest distance from the both ends and the center to the connection between the flap piece and the inner surface of the band.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a side cross-sectional view of a screw mounting cap provided with a TE band of the present invention;
FIG. 2 is a bottom view of the cap of FIG.
FIG. 3 is a view for explaining the shape of a flap piece of the TE band provided on the cap of FIG.
FIG. 4 is a side cross-sectional view of a screw mounting cap provided with a conventionally known TE band,
FIG. 5 is a bottom view of the cap of FIG.
FIG. 6 is a diagram for explaining the state of the flap pieces at the time of opening.
[0015]
1 and 2, the screw-attachable cap according to the present invention roughly includes a cap body 1 and a circumferential-opening history indicating band (TE band) 2 having a circular shape.
The cap body 1 includes a top plate portion 5 and a skirt portion 6 hanging from a peripheral portion of the top plate portion 5.
[0016]
An inner ring 7 extending downward at a distance from the skirt portion 6 is formed on the inner surface of the top plate portion 5, and an outer ring 8 and a small ring are formed at a portion between the inner ring 7 and the skirt portion 6. A projection 9 is formed. A screw 10 is formed on the inner surface of the skirt 6, and the screw 10 is engaged with a screw formed on the outer surface of the container mouth. That is, the screw 10 on the inner surface of the skirt portion 6 and the screw on the outer surface of the container opening are screw-engaged, so that the cap body 1 is attached to the container opening. When the cap body 1 is attached to the container opening, the upper end of the container opening enters the space between the inner ring 7 and the outer ring 8, and the upper end surface is formed on the inner surface of the top plate 5. The small projections 9 are pressed against each other, thereby ensuring a good seal.
[0017]
The TE band 2 is connected to the lower end of the skirt portion 6 of the cap body 1 by a bridge 15, and a plurality of flap pieces 17 are provided on the inner surface of the TE band 2 at circumferential intervals.
[0018]
As is clearly shown in FIG. 1, the flap pieces 17 are directed upward or horizontally inside the cap, but are directed downward or horizontally inside the cap at the time of molding. 17 is turned upside down during post-processing or capping after molding, and the flap pieces 17 oriented in the horizontal direction are deformed upward during capping. As a result, a folding line 20 is formed at the base of the flap piece 17. As shown in FIG. 2, the folding line 20 is different from an arc-shaped curve along the inner peripheral surface of the band 2. However, it will be understood that it is a straight line (chord) connecting both end portions of the base of the flap piece 17.
[0019]
Referring to FIG. 3, in TE band 2 of the present invention, lengths (L) of both ends 17 a of the flap pieces 17 from the inner peripheral surface of band 2 are set to be equal to each other. However, the length (X) of the center portion 17b of the tip portion from the inner peripheral surface of the band 2 is formed to be longer than the length (L). Therefore, when the flap piece 17 is turned upward as shown in FIG. 2, both end portions 17 a, 17 a and the center portion 17 b of the tip portion form a straight line substantially parallel to the turning line 20, and Will be located above.
[0020]
For example, in a conventionally known TE band, for example, as shown in FIGS. 4 and 5, both ends 17a, 17a of the tip portion of the flap piece 17 and the length of the center portion 17b from the inner peripheral surface of the band 2 are set to be equal. Was. In other words, since both ends 17a, 17a and the center portion 17b are located on concentric circles, when the flap piece 17 is folded and turned upward, the interval between the tip center portion 17b and the folding line 20 becomes short. , The tip center portion 17b is in a recessed state.
[0021]
The difference in the shape of the flap pieces 17 as described above causes a difference in the bridge break angle.
That is, referring to FIG. 6, when a cap provided with a conventionally known TE band 2 is screwed to the container mouth 50 and closed, and then the cap is opened, the cap is first shown in FIG. 6 (a). As described above, by the rotation of the cap body 1, both ends of the tip of the flap piece 17 come into contact with the lower side of the band locking projection 52 of the container mouth 50. In this state, the center of the tip of the flap piece 17 is not in contact with the lower side of the band locking projection 52 as shown in FIG. 6B. Therefore, at this stage, an effective force point for causing a bridge break has not yet been formed, and until the center portion of the tip of the flap piece 17 contacts the lower side of the band locking projection 52 to form an effective force point. Further, the cap body 1 has to be rotated, and the bridge breaking angle becomes large.
[0022]
However, in the cap provided with the TE band 2 of the present invention shown in FIGS. 1 to 3, both ends 17 a, 17 a of the tip of the flap piece 17 are positioned below the band locking projection 52 by the rotation of the cap body 1. At the same time, the tip center portion 17b also comes into contact with the lower side of the band locking convex portion 52 to be in the state shown in FIG. 6A, and no further rotation is required to form the effective force point. Therefore, according to the present invention, it is possible to reduce the bridge breaking angle.
[0023]
Further, in the example of the present invention shown in FIGS. 1 to 3, no useless clearance is formed, which is also advantageous in reducing the bridge breaking angle.
For example, in the conventional caps shown in FIGS. 4 and 5, at the time of capping, after the center portion 17b of the tip of the flap piece 17 has passed over the band locking projection 52 of the container mouth 50, both end portions 17a of the tip of the flap piece 17 are formed. , 17a get over the band locking projection 52. Therefore, when the cap is attached to the container mouth 50, a predetermined clearance is provided between the both end portions 17 a, 17 a of the flap piece 17 and the lower surface of the band locking projection 52. The height difference between the both end portions 17a and the center portion 17b is a useless clearance for breaking the bridge, and this point is also a factor that makes it impossible to reduce the bridge breaking angle. However, in the present invention, since there is substantially no height difference between the both end portions 17a and the center portion 17b of the flap piece 17, the above-mentioned useless clearance is not formed. This is extremely advantageous in reducing the size.
[0024]
In the present invention described above, it is most preferable that both end portions 17a, 17a and the center portion 17b of the front end portion of the flap piece 17 are located on a straight line. Set the length from the inner peripheral surface of. For example, the difference (XL) in the length between the central portion 17b and both end portions 17a differs depending on the inner diameter of the cap body 1, the circumferential width of the flap piece 17, and the like, but is applied to a normal beverage bottle or the like. In this case, the length of the center portion 17b of the flap piece 17 from the inner surface of the band 2 is preferably set to be 0.1 to 0.7 mm longer than the length of the both end portions 17a from the inner surface of the band 2. For example, when X-L is about 0.3 mm, the bridge breaking angle can be reduced by about 30 degrees.
[0025]
The cap provided with the TE band 2 of the present invention described above can be made of various plastics, for example, low-, medium- or high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyester, polyamide, styrene resin, and ΔS resin. The flap pieces 17 of the TE band 2 are turned upward during post-processing and capping after the molding, as described above.
[0026]
【The invention's effect】
According to the present invention, the bridge cutting angle is reduced by forming the flap pieces into a shape in which the length from the center of the band at the center of the tip portion is longer than the length from the band inner surface at both ends. As a result, it was possible to provide an opening history clear band having an improved quality assurance function of the contents of the container.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a screw mounting type cap provided with a TE band of the present invention.
FIG. 2 is a bottom view of the cap of FIG. 1;
FIG. 3 is a view for explaining a shape of a flap piece of a TE band provided on the cap of FIG. 1;
FIG. 4 is a side sectional view of a screw mounting type cap provided with a conventionally known TE band.
FIG. 5 is a bottom view of the cap of FIG. 4;
FIG. 6 is a view for explaining a state of a flap piece at the time of opening.
[Explanation of symbols]
1: Cap body 2: TE band 6: Skirt part 15: Bridge 17: Flap piece 52: Locking convex part

Claims (2)

In a circumferential opening history indicating band provided through a breakable bridge at the lower end of the skirt portion of the screw mounting type cap,
On the inner surface of the band, a plurality of flap pieces that are directed inward and upward or in the horizontal direction are provided circumferentially at predetermined intervals. The opening history indicating band is characterized in that the opening length is formed to be longer than the length from the inner surface of the band at both ends in the circumferential direction. 2. The length of the front end of each flap piece from the band inner surface at the circumferential center portion is set to be 0.1 to 0.7 mm longer than the length from the band inner surface at both circumferential end portions. Opening history clear band.

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