JPH09216646A - Pilfer-proof cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep surely a sealed state even if a screw cap is twisted back accidentally or by mischief within a range which does not allow unsealing. SOLUTION: An inner stopper 10 which exactly fits inside the inner circumferential face of a bottle mouth A1 is formed in a packing 9. A vertical length L2 the inner stopper 10 engages with the bottle mouth A1 is set greater than the ascending stroke L1 of a screw cap 1 which is required for unsealing. When the screw cap 1 is twisted back within a range which does not allow unsealing, the inner stopper 10 of the packing 9 is kept engaged with the bottle mouth A1, therefore in the case where pressure in the bottle A is reduced by a hot filling method, the state of the pressure reduction is maintained and a sealed state can be kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pill fur proof cap capable of confirming unauthorized opening at the distribution stage of products.

[0002]

2. Description of the Related Art This type of pill fur proof cap is roughly classified into a screw lid made of a metal plate and a synthetic resin one. Of these, a pill fur proof cap made of synthetic resin is shown in FIG. This is shown in A). This pill fur proof cap 20 has a downward opening screw lid 21 that is detachably fitted to the bottle mouth A1 and a ring portion (TE) connected to the lower end edge of the screw lid 21 via a brittle portion 22 such as a bridge. Band: Tapper Evidence Band))
23, the ring portion 23 is locked to the lower surface of the flange portion A2 formed in the bottle mouth A1 from below, so that when the screw lid 21 is unscrewed after sealing, the fragile portion 2
2 is cut into pieces and opened.

On the inner surface of the upper portion of the screw lid 21, a flat plate-like packing 24 for sealing between the top plate portion of the screw lid 21 and the upper surface of the bottle mouth A1 is attached so as not to fall off. Then, in the step of packaging the liquid B such as a beverage in the bottle (container) A made of various materials such as a PET bottle, as shown in FIG.
First, the inside of the bottle A is filled with the liquid B from the nozzle 25, and then the pill fur proof caps 20 which are aligned and conveyed are sequentially fitted into the bottle mouth A1. It is done in the process of screwing.

In this case, when the liquid is heated to, for example, 80 ° C. and filled in the bottle A, and the liquid B is cooled to room temperature, the internal pressure of the bottle A becomes equal to or lower than the atmospheric pressure. By keeping the inside in a depressurized state, the packing 24 is kept in close contact with the top surface of the bottle mouth A1, and thus the inside of the bottle A is kept in a sealed state. Alternatively, the hot filling method) is generally performed (the inside of the bottle A may be kept in a reduced pressure state by packaging in a reduced pressure chamber).

[0005]

By the way, the screw lid 21 is used.
The fragile part 22 is not cut off immediately after unscrewing,
Flange A2 and ring (TE band) 2 of bottle mouth A1
Since there is a play between the screw portion 21 and the ring portion 23 and the fragile portion 22, the fragile portion 22 cannot be cut unless the screw lid 21 is unscrewed up to a certain dimension L1. Therefore, for example, at the distribution stage such as at a store, the screw lid 2 is not opened due to mischief or carelessness.
1 may be unscrewed and left as it is, or unscrewed to a state where it cannot be opened and then screwed back into the original state.

In the conventional pill fur proof cap 20, however, if the screw lid 21 is unscrewed back even slightly, the seal by the packing 24 is released, so that air intrudes from the outside into the bottle mouth A1 in the depressurized state. And bottle mouth A1
The pressure difference between the inside and outside will be eliminated. When the screw lid 21 is unscrewed to the state where the fragile portion 22 is not broken, the inside and outside of the bottle mouth A1 are in communication with each other, so that the bottle mouth A1 is substantially unsealed even if it is unopened. It is in the same state as described above, which causes inconvenience such as deterioration of the liquid B. Further, even when the screw lid 21 is screwed into the original state, the depressurized state inside the bottle A is released, so that the sealing function is significantly deteriorated.

On the other hand, as shown in FIG.
The top plate portion 21a of No. 1 is integrally formed with the tubular portion 26 that fits on the inner peripheral surface of the bottle mouth A1. However, in this configuration, the tubular portion 26 faces downward in a so-called cantilevered state. Since it merely projects to the end, it is not possible to prevent the phenomenon that the tubular portion 26 sags (plastically deforms) due to the heat of the heated liquid B, and therefore it is difficult to exert a sufficient sealing function. there were.

The present invention has been made in view of the above problems of the prior art. Even if the screw lid is screwed back to a state where it cannot be opened due to carelessness or mischief at the distribution stage, the sealed state is reliably maintained. The purpose of the present invention is to provide a pill fur proof cap made as described above.

[0009]

In order to achieve this object, the present invention provides "a screw cap having a downward opening which is detachably fitted to a bottle mouth having a screw thread formed on the outer peripheral surface thereof, and a cylindrical portion of the screw cap. A ring portion (TE band) connected to the lower end edge of the via a fragile portion, and the ring portion is provided with an engaging portion that abuts against the flange portion formed at the bottle mouth from below, so that after sealing, A pill fur proof constructed such that when the screw lid is unscrewed, the fragile portion is broken and opened, and a soft synthetic resin packing is permanently attached to the upper part of the inside of the screw lid. A cap, wherein the packing is formed with an inner plug portion that fits tightly into the inner peripheral surface of the bottle mouth, and the packing and the screw lid are at least screwed until the fragile portion is cut off after the screw lid is unscrewed. Within the range of Inside plug portion has a configuration of setting the relationship such that exactly fit waiting state on the inner peripheral surface of the bottle mouth are retained. "

In this case, the state in which the inner plug portion is tightly fitted to the inner peripheral surface of the bottle mouth is maintained within the range from the time when the screw lid is started to be unscrewed until the fragile portion is broken. As a concrete form to set such a relationship, the vertical length dimension where the inner plug part of the packing is fitted to the bottle mouth is
The screw lid can be set to have a length longer than the vertical movement stroke until opening, or the packing and the screw lid can be vertically moved by a certain amount.

[0011]

According to this structure, even if the screw lid is unscrewed before the fragile portion is torn and the screw is left alone or screwed into the original state, the inner plug portion of the packing is Since the state in which the bottle mouth is in close contact with the inner peripheral surface is maintained, even when the inside of the bottle mouth is in a depressurized state by the vacuum filling method, the depressurized state is maintained and the sealing is ensured. State is retained.

Since the inner plug portion is formed on the packing which is separate from the screw lid and the inner plug portion is fitted to the inner peripheral surface of the bottle mouth, the packing is attached to the inner plug portion. It is possible to form it so that it strongly pierces the inner peripheral surface of the bottle mouth, or to select a material that does not easily plastically deform due to heat.Therefore, even when applied to a vacuum-filled bottle, the heated liquid The packing does not cause plastic deformation or settling due to the heat generated by the heat.

Therefore, according to the present invention, even if the screw lid is unscrewed back to the state in which it cannot be opened due to carelessness or mischief at the distribution stage, the sealed state can be reliably maintained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment, in which FIG. 1 (A) is a separated perspective view, FIG. 1 (B) is a partially separated sectional view, and FIG. 1 (C) is a perspective view after opening. Figure 2
FIG. 2A is a partially cutaway cross-sectional view in a sealed state, and FIG. 2B is a partially cutaway cross-sectional view in an unsealed state.

The pill fur proof cap has a top plate 2
Is provided with a screw lid 1 formed by projecting a tubular portion 3 downward on the outer peripheral edge of the ring portion, and a ring portion is provided on the lower end edge of the tubular portion 3 of the screw lid 1 via a large number of thin fragile portions 4 that can be split. (TE
The band 5 is integrally connected. The screw lid 1 is made of a soft synthetic resin such as polypropylene. The ring portion 5 is formed in a ring shape with a narrow width portion 6 that can be split into multiple pieces, and one end portion of the ring portion 5 that sandwiches the narrow width portion 6 has a wide bridge portion 7 that cannot be split into multiple pieces. It is connected to the screw lid 1 via. As shown in FIG. 2A, the flange portion A of the bottle mouth A1 is provided on the inner peripheral surface of the ring portion 5.
1 is formed with an engaging portion 8 hooked from below. Needless to say, the engaging portion 8 can have various shapes such as a hook shape and a fin shape (blade shape).

At the upper part of the inside of the screw lid 1,
A packing 9 made of a soft synthetic resin such as polyethylene is attached. The packing 9 has a screw lid 1 substantially entirely.
It is formed so as to come into close contact with the top plate portion 2 of the
A double-cylinder-shaped inner plug portion 10 that fits tightly on the inner peripheral surface of the is protruded downward. Two upper and lower annular projections 11 are formed on the outer peripheral surface of the inner plug portion 10, and the annular projections 11 are used for sealing. An annular protrusion is provided downward at a portion of the packing 9 corresponding to the top surface of the bottle mouth A1.

The outer peripheral edge 9a of the packing 9 is formed in a downward cylindrical shape, and this cylindrical outer peripheral edge 9a is attached to the screw lid 1
The packing 9 is held irremovably from the screw lid 1 by being fitted into the annular recess 12 formed on the inner surface of the upper end portion of the tubular portion 3. Needless to say, the packing 9 is mounted inside the screw lid 1 by being pushed into the screw lid 1 against its elasticity.

The screw lid 1 is screwed into the bottle mouth A1 through the steps as shown in FIG. 5, and the ring portion 5 is elastically deformed by the screwing, goes over the flange A2 of the bottle mouth A1, and is completely screwed. In this state, the engaging portion 8 of the ring portion 5
Is engaged with the flange A2 of the bottle mouth A1 so as not to come out upward. Further, when the liquid B is filled by the hot filling method, the inside of the bottle A is in a depressurized state, so that a downward pulling force acts on the packing 9 as shown by an outline arrow in FIG.

Then, when the screw lid 1 is unscrewed, as shown in FIG.
As shown in (B), since the screw lid 1 moves upward with the ring portion 5 engaged with the flange A2 of the bottle mouth A1,
The fragile portion 4 is torn and the narrow portion 6 of the ring portion 5 is torn to be in a state as shown in FIG. 1 (C), whereby the ring is opened. In this example, the ring portion 5 is still attached to the screw lid 1 via the wide bridge portion 7. This is in consideration of the problem that a recycling facility or the ring portion 5 is put in the mouth by an infant or an animal.

At the time of unsealing as described above, due to the play between the engaging portion 8 of the ring portion 5 and the flange portion A2 of the bottle mouth A1 and the extension deformation of the ring portion 5 and the fragile portion 4, A certain amount of stroke L1 is required from the start of unscrewing the screw lid 1 to the breaking of the fragile portion 4. Therefore, the vertical length dimension L2 with which the inner plug portion 10 is fitted to the inner peripheral surface of the bottle mouth A1 is set to a dimension larger than the upward movement stroke L1 of the screw lid 1 required for opening.

Then, even if the screw lid 1 is unscrewed to the state where it cannot be opened due to carelessness or mischief, the inner plug portion 10 of the packing 9 is still fitted to the inner peripheral surface of the bottle mouth A1. The inside of A remains under reduced pressure,
The sealed state is reliably maintained. Further, since the packing 9 is configured separately from the screw lid 1, the inner plug portion 10 is formed in a double cylindrical shape as in the embodiment, and the bottle mouth A1 is formed.
It can be formed in a cross-sectional shape that keeps a strong tension with respect to the bottle. Therefore, even when it is used for the bottle A to be packaged by the hot filling method, it does not cause a sag phenomenon due to heat and is sealed. The state can be secured.

FIG. 3 shows the second embodiment. In this embodiment, the packing 9 and the screw lid 1 are configured so as to be able to slide up and down relatively by the same dimension as the upward movement stroke L1 of the screw lid 1 required for unsealing.
Is fitted on the inner peripheral surface of the bottle mouth A1 and has a vertical length dimension L3.
Is set to have the same dimension as or slightly larger than the stroke L1 of the screw lid 1 (in this case, L
2 + L3> L1).

According to this embodiment, even if the screw lid 1 is unscrewed, the packing 9 does not rise until it is opened.
The inside of the bottle A is reliably held by the reduced pressure state. In this embodiment, the inner plug portion 10 is formed in a dish shape having an upward opening, and the inner plug portion 10 is also stretched with respect to the bottle mouth A1 by the elastic force of the bottom portion 10a thereof. As indicated by the alternate long and short dash line, the top plate portion 2 of the screw lid 1 may be provided with a cylindrical portion 13 that abuts the bottom plate 10a of the inner plug portion 10 to prevent the bottom plate 10a from being deformed.

The embodiments of the present invention have been described above, but the present invention can be embodied in various forms. For example, the ring portion may be formed separately from the screw lid and attached by some means so as not to be detachable. Further, the present invention is suitable when the screw lid is made of synthetic resin, but can be applied to the screw lid made of a metal plate.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment.

FIG. 2 is a diagram showing a usage state of the first embodiment.

FIG. 3 is a partial sectional view of a second embodiment.

FIG. 4 is a diagram showing a conventional example.

FIG. 5 is a schematic view showing a packaging process in a bottle.

[Explanation of symbols]

 A Bottle A1 Bottle mouth A2 Flange part 1 Screw lid 4 Weak part 5 Ring part (TE band) 8 Engaging part 9 Packing 10 Inner plug part

Claims (1)

[Claims] 1. A screw lid having a downward opening that is detachably fitted to a bottle mouth having a screw thread formed on the outer peripheral surface thereof, and a ring portion (TE) connected to a lower end edge of a cylindrical portion of the screw lid via a fragile portion. Band) and an engaging portion that abuts against a flange portion formed on the bottle mouth from below is formed in the ring portion, and when the screw lid is screwed back after sealing, the fragile portion is broken and opened. A pill fur proof cap, which is constructed by permanently attaching a soft synthetic resin packing to the upper part of the inside of the screw lid, wherein the packing has an inner peripheral surface of a bottle mouth. The inner plug portion is formed so as to be fitted tightly into the inner wall surface of the bottle mouth, at least within the range from the start of unscrewing the screw lid to the breaking of the fragile portion. Keeps fit tightly A pill fur proof cap made of synthetic resin, characterized by being set in such a relationship.