JP4594546B2 - Cap for sealing container mouth - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing cap for a container mouth portion attached to the mouth portion of a container such as a glass bottle or a plastic bottle.
[0002]
[Prior art]
As shown in FIG. 6, as the sealing cap C for the container mouth portion 2, each is provided with a cap body 8 made of synthetic resin and the inside of the cap body 8 to seal the opening of the container mouth portion 2. The cap main body 8 includes a cap top plate 5 and a skirt wall 6 that hangs down from the peripheral edge of the cap top plate 5, and the inner periphery of the skirt wall 6. On the surface, a cap screw portion 7 that is screwed with the container screw portion 3 formed on the outer peripheral surface of the container mouth portion 2 is provided.
[0003]
On the other hand, a sealing packing 9 for the container mouth portion 2 is suspended from an annular flange 11 placed on the upper end of the container mouth portion 2 and an inner peripheral end portion of the annular flange 11 and is attached to the inner surface of the container mouth portion 2. an annular inner leg 12 that is closely fitted, the annular in is continuously provided on the lower side of the leg 12, made dome-shaped packing top plate 13 for sealing the container mouth part 2 by the annular metatarsal 12, open At the time of plugging, for example, the uppermost portion of the cap screw portion 7 is used as a packing guide portion a, and the sealing guide 9 is lifted and opened by the packing guide portion a.
[0004]
By the way, in each beverage manufacturer, the temperature of the contents is set to 90 ° C. and filled in the container 1 (hot pack) for sterilization, and the container C is provided with the cap C having the sealing packing 9. After closing the mouth 2, the container 1 is laid down, the inner surface of the packing is sterilized with high-temperature contents, and then the container 1 is erected for the purpose of sterilization and cooling. I try to do showering.
[0005]
[Problems to be solved by the invention]
In the cap C having the above-described configuration, since the annular gap L exists around the middle leg 12 of the sealing packing 9, the temperature on the lower side of the gap L is particularly difficult to rise. When sterilizing with C shower liquid, it was necessary to set the temperature of the shower liquid to a high temperature.
[0006]
However, when the shower liquid is heated to a high temperature, there is a problem in that the cap C is greatly deformed or contracted, and the sealing performance of the cap C is likely to be lowered.
[0007]
On the other hand, the internal pressure of the container 1 is reduced by cooling after the hot pack, and it is most important to maintain this reduced pressure state with the packing 9, but the container 1 is in a predetermined reduced pressure state. It is difficult to determine from the outside whether or not gas is generated in the container for some reason, and it is difficult to determine the situation from the outside.
[0008]
Incidentally, the locking illustration is omitted, the lower side of the skirt wall, thereby continuously provided tamper evidence band via breakable bridges, the lower portion of the inner surface of the skirt portion, the lower the raised portion of the annular was continuously provided to allow locking member called pilfer-proof cap smell, the fact remains that Hallam similar to the above problems.
[0009]
The present invention has been made in view of such circumstances, and its purpose is to reduce the sterilizing shower liquid temperature while keeping the temperature of the sterilizing shower liquid low. In addition, it is possible to provide a sealing cap for the container mouth so that the reduced pressure state of the container can be confirmed from the outside.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, as the sealing cap for the container mouth portion composed of the cap body and packing described at the beginning, the inner peripheral surface of the annular middle leg of the sealing packing is packed toward the lower side. It is formed in the inclined surface part inclined to the center side of the top plate, an opening is formed in the cap top plate of the cap body, and the gap is filled around the opening when the cap is closed and the inclined surface portion of the middle foot is pressed A middle foot pressing member that elastically deforms the middle foot in the diameter-expanding direction is provided in a hanging manner so that the packing middle foot is pressed against the inner surface of the container mouth by wedge action, and the packing top plate that faces the opening The part is configured to be elastically deformable in the thickness direction, and the packing top plate part is formed almost flat so as to be substantially flush with the cap top plate, and the packing is reduced as the container internal pressure is reduced after closing. Heaven It is characterized in that the part in that configured to be recessed (claim 1).
[0011]
According to the above characteristic configuration, when sterilizing the cap with the shower liquid, the shower liquid is sprayed directly on the packing through the opening of the cap top plate, so even if the temperature of the sterilizing shower liquid is set low, The packing can be sterilized well as prescribed, and since the cap is less likely to be thermally deformed or contracted, the sealing performance of the cap is also improved.
[0012]
When the container is depressurized by cooling after hot-packing, the top plate portion of the packing facing the opening of the cap body is recessed due to the effect of the vacuum, and when a leak occurs unexpectedly, the vacuum Since the packing top plate part is not effective, the packing top plate part is elastically restored to a substantially flat posture so that it is almost flush with the cap top plate, and the packing top plate part faces the opening of the cap body. Thus, the recessed state of the packing top plate portion and the state of elastic return to the flat posture can be visually confirmed from the outside of the cap.
[0013]
Therefore, it is possible to make a judgment that the hot pack container is a non-defective product based on the confirmation of the recess in the packing top plate portion, and to confirm that the packing top plate portion has elastically returned to a flat posture. Based on this, it can be determined that the hot pack container is a leaked defective product.
[0014]
In addition, on the inner peripheral surface of the annular middle leg, there is an inclined surface part that inclines toward the center of the packing top plate toward the lower side, while pressing the inclined surface part around the opening of the cap top plate to close the packing middle foot A middle foot pressing member that elastically deforms in the diameter-expanding direction by the action is provided in a hanging manner, and the packing middle foot is pressed against the inner surface of the container mouth to further improve the sealing performance of the cap.
[0015]
If the packing top plate is swelled in a dome shape as the internal pressure of the container after closing is closed (Claim 2), the gas is generated not only in the hot pack container but also in the container for some reason. At that time, the pressure inside the container increases, and the packing top plate swells in a dome shape with this pressurization, so that it can be judged that it is a defective product by visual inspection. It is.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state before the cap C is assembled, and FIG. 2 shows the main part of the container 1 with the cap C. Specifically, the contents are hot-packed in the container 1 and the cap C is closed. It shows the state that has been.
[0017]
A container 1 according to this embodiment is made of glass (or made of synthetic resin), and a container screw part 3 for attaching a cap and an annular raised part 4 are formed on the outer surface of the container mouth part 2. ing.
[0018]
The above cap C is adapted to hanging continuously provided the skirt wall 6 on the periphery of the cap top plate 5, the inner surface of the skirt wall 6, and a cap threaded portion 7 which is screwed into the container thread portion 3 of the A cap body 8 and a packing 9 that is provided inside the cap body 8 and seals the opening of the container mouth 2, and the cap top plate 5 has a slightly smaller diameter than the opening of the container 1. The opening 10 is formed.
[0019]
The cap body 8 is made of, for example, a polypropylene-based hard synthetic resin, and the sealing packing 9 of the container mouth portion 2 is made of, for example, a polyethylene-based soft synthetic resin, and the packing 9 is made of a container mouth portion. 2, an annular flange 11 placed on the upper end of the annular flange 11, an annular middle leg 12 that is suspended from the inner peripheral end of the annular flange 11 and is tightly fitted to the inner surface of the container mouth 2, and It is continuously provided on the lower side of, and a packing top plate 13 for sealing the container mouth part 2 by the annular metatarsal 12.
[0020]
And the part 13a which faces the cap opening part 10 of this packing top plate 13 is comprised so that elastic deformation is possible in the thickness direction, and this packing top board part 13a is made to bulge to the opening part 10 side so that a dome shape may be exhibited. In addition, the upper surface portion of the packing top plate portion 13a is formed to be substantially flat so as to be substantially flush with the cap top plate 5, and further on the inner peripheral surface of the annular middle foot 12 toward the lower side. An inclined surface portion 12 a having a tapered surface inclined toward the center side of the packing top plate 13 is formed.
[0021]
On the other hand, around the opening 10 of the cap top plate 5, and continuously provided a metatarsal pressing member 14 to elastically deform the packing metatarsal 12 presses the inclined surface portion 12a when plugging in diameter direction, the inner leg pressing member 14 Thus, the gap L between the middle leg 12 of the packing 9 and the peripheral portion of the packing top plate 13 is filled.
[0022]
According to the cap C having the above configuration, when the cap screw portion 7 of the cap body 8 is screwed to the container screw portion 3 at the time of closing, first, the middle leg 12 of the sealing packing 9 is attached to the container mouth portion 2. The middle foot pressing member 14 which is tightly fitted to the inner surface and finally formed around the opening 10 of the cap body 8 presses the inclined surface portion 12a of the middle foot 12, and the packing middle foot 12 is formed by the wedge action at this time. Is elastically deformed in the diameter-expanding direction, so that the container mouth 2 is firmly sealed.
[0023]
When the cap C is attached to the mouth portion 2 of the container 1 in which the contents are hot-packed, and when showering is performed for the purpose of sterilization and cooling, the packing top plate portion 13a is attached to the opening of the cap body 8. 10, the shower liquid is sprayed directly onto the packing 9 through the opening 10, and therefore the packing 9 is good as prescribed without increasing the temperature of the sterilizing shower liquid. Since the showering temperature can be lowered, thermal deformation and shrinkage of the cap C are less likely to occur, and the sealing performance of the cap C is enhanced.
[0024]
On the other hand, when the contents filled in the container 1 are cooled and the internal pressure of the container is reduced, as shown in FIG. 3, the packing top plate portion 13a is recessed inward of the container as the pressure is reduced. However, the packing middle leg 12 is strongly pressed against the inner surface of the container mouth portion 2 by the tensile force caused by the elastic deformation of the packing top plate 13 in the diameter expansion direction, and the sealing performance of the cap C Will be even higher.
[0025]
Further, due to the effect of the vacuum accompanying the reduction of the internal pressure of the container, the packing top plate portion 13a facing the cap opening 10 is recessed, and when a leak occurs unexpectedly, the vacuum does not work and the packing top plate The portion 13a is elastically returned to a substantially flat posture (corresponding to the state shown in FIG. 2) so that it is substantially flush with the cap top plate 5.
[0026]
Therefore, it can be determined that the hot pack container 1 is a good product based on the confirmation of the recess of the packing top plate portion 13a, and the packing top plate portion 13a is elastically restored to a flat posture. Based on this confirmation, it can be determined that the hot pack container 1 is a leaked defective product.
[0027]
Further, not only the hot pack container 1, but when gas is generated in the container for some reason, the container internal pressure becomes high, and as shown in FIG. Since it swells into a shape, it can be judged that it is a defective product by visual inspection.
[0028]
At the time of opening, the uppermost portion of the cap screw portion 7 (the upper end portion of the thread of the female screw) is used as the packing guide portion a, and this packing guide portion a is opened by lifting the sealing packing 9. The cap C of the configuration is a two-piece configuration in which the cap body 8 and the sealing packing 9 are completely independent. At the initial stage of opening, the sealing packing 9 rotates simultaneously even if the cap body 8 is rotated. Therefore, even if the packing 9 is firmly adhered to the inner surface of the container 1, the initial opening force is not increased, and the opening can be easily performed.
[0029]
In the embodiment described above, the inclined surface portion 12a is formed with a tapered surface on the inner peripheral surface of the annular middle foot 12, but as shown in FIG. A rib-like ridge is provided so as to be uneven in the direction and inclined toward the center of the packing top plate 13 toward the lower side, and the inclined surface portion 12a is formed with the mountain surface of this ridge. It may be.
[0030]
【The invention's effect】
As described above, according to the present invention, even if the showering temperature for sterilization is set low so that the sealing performance of the cap is not lowered, it is possible to sterilize the packing well as prescribed. In addition, there is provided a sealing cap for the container mouth portion from which the decompressed state or leaked state of the container and the pressurized state of the container accompanying the generation of gas can be confirmed from the outside. Together to press the inclined surface of the foot during the packing during plugging, the cap top plate the metatarsal pressing member to fill the gap between the inner leg and the packing top board with elastically deform in the diameter direction of the packing metatarsal this Further, it was possible to achieve a further increase in the sealing performance of the cap by arranging the middle leg of the packing so as to press the packing middle leg against the inner surface of the container mouth portion by a wedge action.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a left half of a cap showing a state before assembly of a cap body and a sealing packing.
FIG. 2 is a cross-sectional view showing the left half of the cap in a closed state.
FIG. 3 is an operation diagram showing a state in which a packing top plate portion is recessed by a vacuum accompanying a decrease in the internal pressure of the container.
FIG. 4 is an operation diagram showing a state in which the packing top plate bulges out in a dome shape as the container internal pressure is increased.
FIG. 5 is a cross-sectional view showing a left half of a sealing packing according to another embodiment.
FIG. 6 is a cross-sectional view showing a left half of a cap in a closed state according to a conventional example.
[Explanation of symbols]
2 ... Container mouth part, 3 ... Container screw part, 5 ... Cap top plate, 6 ... Skirt wall, 7 ... Cap screw part, 8 ... Cap body, 9 ... Sealing packing, 10 ... Opening, 11 ... Ring flange 12 ... Middle foot, 12a ... Inclined surface portion, 13 ... Packing top plate, 13a ... Packing top plate portion, 14 ... Middle foot pressing member.

Claims (2)

It consists of a cap body made of synthetic resin and a packing that seals the opening of the container mouth. The cap body is provided on the cap top plate, a skirt wall hanging from the periphery of the cap top plate, and an inner peripheral surface of the skirt wall. A cap screw portion that is screwed with a container screw portion formed on the outer peripheral surface of the container mouth portion, and the packing is an annular flange placed on the upper end of the container mouth portion, An annular middle leg that is suspended from the peripheral end and is tightly fitted to the inner surface of the container mouth, and is provided continuously to the lower side of the annular middle leg, and a gap is placed between the middle leg, and A sealing cap for a container mouth portion comprising a dome-shaped packing top plate that seals the container mouth portion together with the annular middle foot, the inner circumferential surface of the annular middle foot of the sealing packing being arranged toward the lower side. Inclined surface that inclines toward the center of the packing top plate Formed, an opening is formed in the cap top plate of the cap body, around the opening, in which is elastically deformed in the diameter direction of the inner leg presses the inclined surface portion of the metatarsal with fill the gap during plugging A foot pressing member is provided in a continuous manner so that the packing middle foot is pressed against the inner surface of the container mouth portion by a wedge action, and the top plate portion of the packing facing the opening is configured to be elastically deformable in the thickness direction. The packing top plate portion is formed to be substantially flat so as to be substantially flush with the cap top plate, and the packing top plate portion is recessed as the container internal pressure is reduced after closing. A cap for sealing the mouth of the container.   2. The cap for sealing a container mouth according to claim 1, wherein the packing top plate is bulged in a dome shape as the container internal pressure is increased after closing.

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