JPS649228B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a container lid that is attached to and seals the mouth of a container. Container lids for sealing the mouth of containers such as bottles containing fruit juice drinks containing natural fruit juices include a shell having a top surface and a skirt that hangs down from the periphery of the top surface, and the inside of the top surface of the shell. Container lids equipped with a liner material disposed on the container lid are widely used in practical use. Such a container lid seals the container mouth well under normal conditions, but if the pressure inside the container rises abnormally, it releases the pressure inside the container to the outside and prevents the container from exploding. It is important that the container has so-called explosion-proof properties. For example, when a beverage containing natural fruit juice is stored in a container, the natural fruit juice ferments when the container opening is opened once, the beverage is exposed to the atmosphere, and then the container opening is sealed again with the container lid. If the pressure inside the container is abnormally increased due to a phenomenon or the like, and the pressure is not appropriately released to the outside, an unacceptable situation will occur in which the container will explode. However, with the conventional container lid of the type described above, even if the pressure inside the container increases abnormally, it cannot be released appropriately, and therefore there is a risk that an unacceptable situation such as explosion of the container may occur. It was hot. The present invention has been made in view of this fact, and its main purpose is to seal the mouth of the container sufficiently well under normal conditions, but to ensure that the pressure inside the container is properly sealed when the pressure inside the container rises abnormally. to the outside,
Thus, it is an object of the present invention to provide a new and superior container lid that is improved to reliably prevent explosion of the container. As a result of intensive research and experiments, the inventors of the present invention have formed a stepped part on the periphery of the top surface of the shell, in contrast to the conventional container lid of the form described above, and have created a container mouth part on which the container lid is attached. The main part of the top surface having an outer diameter larger than the inner diameter of the edge of the container is recessed relative to the peripheral edge thereof, and a liner material is interposed between the main part of the top surface and the edge of the container mouth. It has been discovered that if the pressure inside the container rises abnormally, the pressure inside the container will be reliably released to the outside due to the so-called doming phenomenon of the top surface of the shell, which includes deformation of the step part on the top surface of the shell. Ta. That is, according to the present invention, a shell having a top surface and a cylindrical skirt hanging down from the periphery of the top surface;
In a container lid having a liner material disposed on the inside of the top surface of the shell, the top surface has a stepped portion at its periphery, and the main portion of the top surface is The outer diameter of the main portion of the top surface is larger than the inner diameter of the edge of the container mouth portion to which the container lid is attached, and the liner material is recessed from the inside of the main portion of the top surface. A container lid is provided which is interposed between the container lid and the edge of the container opening. DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in more detail to the accompanying drawings, which illustrate one embodiment of a container closure improved in accordance with the present invention. Referring to FIG. 1, the illustrated container lid, generally designated by the numeral 2, includes a shell 4 and a liner material 6. As shown in FIG. The shell 4, which is preferably formed from a suitable metal thin plate such as an aluminum-based alloy thin plate having a thickness of about 0.20 to 0.25 mm, has a circular top surface 8 and a circular top surface 8.
It has a cylindrical skirt 10 that hangs down from the periphery of the cylindrical skirt. In the illustrated example, the skirt 10 is defined by a plurality of circumferentially extending slits 12 formed at intervals in the circumferential direction and bridging portions 14 located between these slits 12. The skirt 10 is divided into a main portion 18 above the circumferential break line 16 and a pilfer-proof hem 20 below the circumferential break line 16. has been done. At the upper part of the main part 18 of the skirt 6, there is a shell 4.
Knurling or unevenness 22 is formed over the entire circumferential direction to prevent slippage when gripping with fingers. On the other hand, the liner material 6 is disposed inside the top surface of the shell 4 described above. This liner material 6 is
An appropriate synthetic resin material may be formed in advance into a predetermined shape, for example, a disk shape, and inserted into the shell 4, or an appropriate synthetic resin material may be distributed inside the top surface of the shell 4 and then shaped into a predetermined shape. It may also be formed by molding (for example, embossing). The above-described configuration of the illustrated container lid 2 is already known and is merely an example of the configuration of a container lid that can be improved according to the present invention.
Therefore, details of the configuration as described above are omitted in this specification. According to the present invention, the following improvements are added to the container lid 2 as described above. That is, according to the present invention, the annular step 24 is formed on the top surface 8 of the shell 4, and the main portion 26 of the top surface 8 defined inside the step 24 is located outside the step 24. It is recessed by a required dimension x with respect to the peripheral edge 28 of the top surface 8. It is important that the outer diameter d ₁ of the main portion 26 of the top surface 8 that is depressed is larger than the inner diameter d ₂ of the edge 32 of the container mouth 30 (see Figure 2) to which the container lid 2 is attached. , and the container opening 3
It is preferable that the outer diameter _d3 of the edge 32 of 0.0 is substantially the same as or slightly larger than that. Further, the depth of the stepped portion 24, that is, the depression dimension x of the main portion 26 with respect to the peripheral portion 28 is preferably about 0.3 to 1.0 mm, particularly about 0.4 to 0.7 mm. Furthermore, the step 24 is advantageously sloped downwardly radially inwardly at an angle α, preferably approximately 30 to 80 degrees, as clearly shown in FIG. It is convenient that the stepped portion 24 and the peripheral portion 28 and the stepped portion 24 and the main portion 26 are connected via a curved portion. The container lid 2 as described above and illustrated in FIG. 1 is applied, for example, to a container opening having the form generally indicated by the numeral 30 in FIG. The container opening 30 shown in FIG. 2 has a thread 34 on its outer peripheral surface and a jaw 3 located adjacent to and below the thread 34.
6 is formed. To briefly describe a method of applying the container lid 2 to such a container mouth 30 and sealing the container mouth 30 as shown in FIG. 2, the container mouth 30 is sealed by the container lid 2. When doing so, first, the container lid 2 is fitted onto the container opening 30, and then the main portion 26 on the top surface 8 of the shell 4 is fitted.
The liner material 6 interposed between the main portion 26 on the top surface 8 and the edge 32 of the container mouth 30 is pressed against the edge 32 of the container mouth 30 by applying a required pressing force to the outer surface of the container. However, Ciel 4's skirt 10
A thread 38 is formed along the thread 34 of the container opening 30 on the main portion 18 of the pilfer-proof hem 30, and the lower end of the pilfer-proof hem 20 is bent radially inward to engage the jaw 36 of the container opening 30. Make it stop. Thus,
The state shown in FIG. 2 is achieved, the container lid 2 is securely attached to the container opening 30, and the container opening 3
0 is sealed. When the container lid 2, which has been hermetically attached to the container mouth 30 as described above, is removed from the container mouth 30 and the container mouth 30 is opened, the knurling or unevenness formed in the main part of the skirt 10 is removed. 22 (first
(Fig.) and rotate the container lid 2. In this way, the thread 38 formed on the main part 18 of the skirt 10 of the shell 4 is connected to the thread 34 of the container opening 30.
Since the container lid 2 is moved along the rotation axis, the container lid 2 is moved upward in the axial direction at the same time as the rotation. However, since the pilfer-proof hem 20 of the skirt 10 is locked to the jaw 36 of the container mouth 30, movement or rotation in the axial direction is prevented. Therefore, considerable stress is generated in the circumferential break line 16, which causes the circumferential break line 16 to rupture as shown in FIG. After that, the portion other than the pilfer-proof hem 20 can move upward in the axial direction and can rotate, and is thus separated from the container opening 30, and the container opening 30 is opened. .
On the other hand, the pilfer-proof hem 20 remains in the container opening 30 as it is. If it is desired to temporarily reseal the container opening 30 opened as described above with the container lid 2, the pilfer-proof hem of the container lid 2 removed from the container opening 30 is attached. The thread 3 is formed in the main part of the skirt 10 of the shell 4 by fitting the part other than the part 20 and then rotating in a desired direction.
8 to the thread 34 formed in the container opening 30, and the state shown in FIG. 3 is restored. Therefore, the container (only its opening is shown in Figures 2 and 3)
If the content contained in the container (as shown in the figure) is, for example, a beverage containing natural fruit juice, the container opening 30 is once opened as described above to expose the contents to the atmosphere, and then the container lid 30 is opened again. Container opening 30
When the container is sealed, the pressure inside the container may rise abnormally due to fermentation of natural fruit juice, etc. Furthermore, even in the state before the container opening 30 is once opened (that is, the state shown in FIG. 2), if the ambient temperature rises significantly, the pressure inside the container may rise abnormally due to this. be. If the pressure inside the container increases abnormally in this way, unless the abnormally increased pressure inside the container is released to the outside, an unacceptable situation will occur in which the container will explode. However, according to the container lid 2 as described above which has been improved according to the present invention, when the pressure inside the container increases abnormally, the top surface 8 and the top surface 8 of the shell 4 A so-called doming phenomenon occurs in which the liner material 6 disposed inside the container is deformed as shown by the two-dot chain line in FIGS. It escapes to the outside through between the edge 32 of the spout 30 and the explosion of the container is thus reliably prevented. As a point to be particularly noted, as will be understood from the Examples and Comparative Examples described later, in the container lid 2 improved according to the present invention, the shell 4
An annular step 24 is formed at a predetermined position on the top surface 8 of the top surface 8, and the main portion 26 of the top surface 8 is recessed by a required dimension with respect to the peripheral edge 28. As a result, the top surface 8 of the shell 4 relatively easily causes a doming phenomenon, and thus the abnormally increased pressure is reliably released to the outside of the container, and explosion of the container is reliably prevented. Examples and Comparative Examples One side of an aluminum-based alloy thin plate with a thickness of 0.25 mm was printed and coated with a vinyl-based protective lacquer, and the other side was coated with a vinyl-based paint. Then, such a thin plate was subjected to pressing, etc., with the surface coated with vinyl paint facing inside, to form a shell in the form shown in FIG. 1. Next, a liner material with a diameter of 27.45 mm and a thickness of 2 mm made of foamed polyethylene laminated with a polyester film was inserted into the shell and positioned on the inside of the top surface.
In this way, a container lid as an example of the present invention was produced. The dimensions of each part of the shell were as follows (first
(see figure). Outer diameter of the top surface d ₄ ......28.4mm Inner diameter of the peripheral edge of the top surface d ₅ ......25.0mm Outer diameter of the main part of the top surface d ₁ ......23.6mm Depth of the step section x ......0.6mm Inclination angle α of the step part 40 degrees Radius of curvature of the curved part between the peripheral edge and the step part r ₁
......0.75mm Radius of curvature of the curved part between the stepped part and the main part r ₂
………0.70mm A container which is a commercially available glass bottle for whiskey and has a container opening with an inner diameter d ₂ = 18.5 mm at the edge of the container opening and an outer diameter d ₃ = 24.9 mm. The pressure test was carried out as described below. For comparison, a container lid was prepared which was the same as the above example except that no step was formed on the top surface of the shell and the entire top surface was a flat surface. Furthermore, for comparison, the inner diameter of the top surface periphery d ₅ =
17.0 mm, and the outer diameter d ₁ of the main part of the top is 15.5 mm, and the outer diameter d ₁ of the main part of the top is smaller than the inner diameter d ₂ of the edge of the container mouth. An identical container lid was made and used as a comparative example. And regarding the comparative example and the container lid,
Similarly to the container lid of the example, the following pressure resistance test was carried out. [Pressure test] Attach the container lid to the container mouth and leave it in the state shown in Figure 2. Then, remove the container lid (more specifically, the part of the container lid other than the pilfer-proof hem) from the container mouth. I was forced to leave. Thereafter, a 43% alcohol aqueous solution was filled into the container so that 1% of the total volume of the container remained. Next, the container lid that was removed from the container mouth was fitted onto the container mouth again, and the specified torque (20 kg-cm) was applied.
and 25 kg-cm) and attached it to the mouth of the container, resulting in the state shown in FIG. Thereafter, the temperature inside the container was raised to gradually increase the pressure inside the container, and the temperature was measured when a leak occurred and/or when the container exploded (broken). however,
The temperature inside the container was measured by preparing a separate container from the container for the pressure test, placing this container in the same atmosphere as the container for the pressure test, and measuring the temperature inside the container. The pressure test as described above was carried out on 5 container lids of Example, Comparative Example, and each with reinstallation torque of 20 Kg-cm and 25 Kg-cm. The results shown in Table 3 were obtained. In Tables 1 to 3 below, the mark ◯ indicates the occurrence of leakage (escape of pressure inside the container), and the mark x indicates the occurrence of explosion of the container (broken bottle).

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【table】

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[Pressure test]

The container lid was attached to the container mouth and brought into the state shown in FIG. 2, and then the container lid (more specifically, the portion of the container lid other than the pilfer-proof hem) was removed from the container mouth. Thereafter, the container was filled with water so that 1% of the total volume of the container remained. Next, the container lid that was removed from the container mouth was fitted onto the container mouth again, and the predetermined torques (15Kg-cm, 20Kg-cm, 25Kg-cm and 30Kg
-cm) and attached to the mouth of the container, as shown in FIG. After that,
A pressurizing tester (product name: ``Aluminium Company of America'') that can increase the pressure inside the container through a conduction needle inserted into the container through the top surface of the shell of the container lid and the liner material. When the pressure inside the container was gradually increased to 9.13Kg/cm ² using a pressure testing machine (sold as "Proper Application Tester"), a leak (escaping the pressure inside the container) occurred. The pressure was measured. The pressure resistance test as described above was carried out on five container lids of Examples, Comparative Examples, and Refitting Torques of 15 Kg-cm, 20 Kg-cm, 25 Kg-cm, and 30 Kg-cm, respectively. However, the results shown in Table 4 below were obtained. The numbers in Table 4 indicate the number of samples in which leakage (escape of pressure inside the container) occurred.

[Table] In view of the pressure resistance test and results as described above, the container lid of the example improved in accordance with the present invention can reliably release the pressure when the pressure inside the container rises abnormally. It is clear that an excellent effect not seen in the comparative example and the container lid can be obtained, in that the explosion of the container is reliably prevented. Although a specific example of a container lid configured according to the present invention has been described above in detail with reference to the accompanying drawings, the present invention is not limited to such specific example, and does not depart from the scope of the present invention. It goes without saying that various modifications and modifications can be made without any problems. In particular, in certain forms of pilfer-proof hems (i.e., when opening the container opening after the container lid is once attached to the container opening and the container opening is sealed, the circumferential break line is completely broken). Therefore, the so-called roll-on type has a pilfer-proof hem in which the portion of the container lid other than the pilfer-proof hem is detached from the container mouth, but the pilfer-proof hem remains in the container mouth. Although the invention has been described in connection with a container lid, the invention is not limited to such particular container lids, and is intended to be used with other forms of pilfer-proof skirts (i.e., with a container lid at the mouth of the container). Even when the container mouth is opened after being attached and the container mouth is sealed, the pilfer-proof hem is not completely separated from the main part of the skirt but is connected to the main part of the skirt at least in part. A roll-on container lid having a pilfer-proof hem (such as a pilfer-proof hem that allows the pilfer-proof hem to be removed from the mouth of the container without being left in the mouth) or a pilfer-proof hem. It can be similarly applied to ordinary roll-on type container lids, and furthermore, it can be applied to so-called press screw type (screw type) container lids or so-called lug type container lids instead of roll-on type container lids. It is obvious that the present invention can be applied to various types of container lids in the same manner, without further mentioning.

[Brief explanation of drawings]

FIG. 1 is a side view, partially in section, of a specific example of a container lid improved according to the present invention. FIG. 2 is a sectional view showing a state in which the container lid shown in FIG. 1 is attached to the container mouth and the container mouth is sealed. Figure 3 shows
FIG. 3 is a cross-sectional view showing a state in which a circumferential break line formed in the skirt of the shell is broken when opening the container opening from the state shown in FIG. 2; 2...Container lid, 4...Ciel, 6...Liner material, 8...Top surface, 10...Skirt, 24...Step part of top surface, 26...Main part of top surface, 28...Top surface Peripheral edge of surface, 30...container mouth, 32...edge of container mouth.

Claims (1)

[Scope of Claims] 1. A container lid comprising a shell having a top surface and a cylindrical skirt hanging from the periphery of the top surface, and a liner material disposed inside the top surface of the shell, wherein the top surface An annular stepped portion is formed on the top surface, and the main portion of the top surface is recessed relative to the peripheral edge thereof, and the outer diameter of the main portion of the top surface is equal to the diameter of the container mouth portion to which the container lid is attached. A container lid having a larger inner diameter than the edge, and characterized in that the liner material is interposed between the inside of the main portion of the top surface and the edge of the container mouth. 2. The container lid according to claim 1, wherein the outer diameter of the main portion of the top surface is substantially the same as or slightly larger than the outer diameter of the edge of the container mouth. 3. The container lid according to claim 1 or 2, wherein the step has a depth of 0.3 to 1.0 mm. 4. The container lid according to claim 3, wherein the step has a depth of 0.4 to 0.7 mm. 5. The stepped portion is slanted downwardly at an angle of approximately 30 to 80 degrees radially inward.
The container lid according to any one of items 1 to 4. 6. The container lid according to claim 5, wherein the stepped portion and the peripheral portion and the stepped portion and the main portion are connected by a curved portion.