JPS58193266A - Vessel cover - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a container lid, and more particularly to a container lid suitable for, but not limited to, synthetic resin containers for carbonated beverages such as beer.

Recently, relatively large capacity (2
Containers made of polyethylene terephthalate (PET) have come into practical use as 1 or 3 ton containers. Such containers generally have a neck portion on the outer circumferential surface of which is formed a male thread and a locking 7 flange located below the male thread. On the other hand, a container lid for sealing the mouth and neck of such a container includes a metal shell comprising a top wall and a cylindrical skirt wall hanging from the periphery of the top wall, and a metal shell disposed on the inner surface of the top wall. A type of three-container lid is commonly used, consisting of a synthetic resin liner such as polyethylene. The skirt wall of the metal shell has a weakened line extending in the circumferential direction.
The skirt wall is divided into a main portion located above the weakened line and a pilfer-proof hem portion located below the weakened line.

A synthetic resin liner generally includes a sealing annular protrusion that is brought into close contact with the outer circumference of the edge of the mouth and neck of the container, and this seal #3.
A positioning member arranged concentrically inside the lobe-like ridge has a ridge-like ridge. When attaching such a container lid to the mouth and neck of the container to seal the mouth, make sure that the entire container lid is fitted over the mouth and neck.
Pressure is applied mainly to the boundary area between the top wall and the skirt wall of the metal shell to bring the sealing annular protrusion of the synthetic resin liner into close contact with the outer part of the edge of the mouth and neck, and while maintaining this state, the mouth is closed. A female thread is formed on the main part of the skirt wall along the male thread formed on the outer circumferential surface of the neck, and the lower end of the pilfer-proof hem is deformed inwardly to the outer periphery of the neck. It is locked to the lower surface of the locking flange formed on the surface. When removing the container lid from the mouth and neck of the container to open the mouth and neck, the container lid is rotated in the opening direction (generally counterclockwise when viewed from above).

However, in the conventional container lids of the type described above, the so-called necessary opening torque required to rotate the container lid in the opening direction when opening the neck part is quite large, and it is often difficult to open the container lid. There are drawbacks that need to be resolved.

As a result of the inventors' investigation into such drawbacks,
The following facts were discovered. When the content to be filled in the container is a carbonated beverage, such as beer, it is well known to those skilled in the art that the beer in the container must be removed before filling the container with beer and then attaching the container lid to the mouth and neck. A so-called foaming process is carried out in which the foam is made to foam and flow out from the mouth and neck, thus expelling the air present in the container. In such a case, when the container lid is attached to the mouth and neck, the beer that flows out from the mouth and neck remains between the mouth and neck and the container lid. This residual beer solidifies over time, producing a so-called beer cement effect, and this beer cement effect increases the required opening torque.

In order to avoid the above-mentioned disadvantage that the required opening torque is quite large and it is often difficult to open,
(1) To reduce the pressing force applied to the container lid when the container lid is attached to the mouth part, (b) To prevent the formation of the beer cement effect mentioned above, when attaching the container lid to the mouth neck part. Prior to this, after the above lathering process, the oral part is washed with water.
etc. are possible.

However, if method (a) is adopted, the sealing performance of the mouth and neck region tends to deteriorate and become unacceptable. In addition, if the above method (Naka) is adopted, it is possible to obtain some results, but it is extremely difficult, if not impossible, to thoroughly wash the mouth area without causing washing water to flow into the container. Due to certain reasons, it is not possible to obtain fully satisfactory results.

The present invention has been made in view of the above facts, and its main purpose is to provide an improved container lid that maintains sufficient sealing performance and can reduce the required opening torque to a required value or less. be.

As a result of intensive research and experiments, the present inventors have determined that the lower surface of the sealing annular protrusion, which is brought into close contact with the outer periphery of the edge of the mouth and neck in conventional container lids, is at an angle of 30 degrees or less with respect to the central axis. However, surprisingly, the lower surface of the sealing annular protrusion was inclined at an angle of 80 to 65 degrees, particularly 77 to 70 degrees, to the central axis. It has been found that the above object can be achieved by tilting it downward.

7- That is, according to the present invention, there is provided a container lid for a container having a neck portion in which a male thread is formed on the outer peripheral surface, which comprises a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall. In a container lid of a type, the inner surface of the top wall is formed with a synthetic resin sealing annular protrusion that is brought into close contact with the outer periphery of the opening; A container lid is provided, characterized in that the lower surface is inclined outwardly and downwardly at an angle of 80 to 65 degrees, in particular 77 to 70 degrees, relative to the central axis.

A more detailed description will be given below with reference to the accompanying drawings.

Referring to FIG. 1, which illustrates one embodiment of a container lid constructed in accordance with the present invention, the illustrated container lid, generally designated by the numeral 2, comprises a metal shell 4 and a synthetic resin liner 6. It consists of

The metal shell 4, which is formed from a suitable metal sheet such as aluminum-based alloy, tinplate, or chromic acid-treated steel, has a large circular wall 8 and a cylindrical skirt wall 10 depending from the periphery of the circular top tank 8. and has.

The skirt wall 1oic is formed with a weakened line 12 extending in the circumferential direction, and the skirt wall 10 has a main part 14 located above the weakened line 12 and a pilfer-proof hem part 16 located below the weakened line 12. It is divided into. The illustrated weakened line 12 is defined by a plurality of slits (kerfs) 18 formed at intervals in the circumferential direction and so-called bridging portions 20 existing between the slits 18, and the bridging portions 20 prevent the pill from forming. A fur-proof hem portion 16 is connected to the raw portion 14. Knurling or uneven shapes 22 and 24 are formed at the upper and lower ends of the main portion 14 to prevent slippage when the container lid 2 is rotated with a finger. On the other hand, pilfer-proof hem 16VC
A plurality of weakened lines 28 extending in the direction of the central axis 26 of the container lid 2 are formed at intervals in the circumferential direction. The illustrated weakening line 28 consists of a so-called score created by reducing the thickness of the material.

The illustrated liner 6 is molded from any suitable synthetic resin material such as polyethylene, polypropylene or polyvinyl chloride.
has a sealing annular protrusion 30 and a positioning annular protrusion 32 arranged concentrically inside the sealing annular protrusion 30. Such a liner 6 can be molded at a predetermined position on the inner surface of the top wall 8 of the metal shell 4 by a stamping method well known to those skilled in the art.

The above-described configuration of the illustrated container lid 2 is already known and is merely an example of the container lid 2 to which the present invention is applied.

Referring to FIG. 2 as well as FIG. 1, in the container lid 2 constructed according to the present invention, the sealing annular shape is brought into close contact with the outer part of the edge of the mouth and neck of the container, as will be described later. The lower surface 34 of the protrusion 30 extends outwardly and downwardly at an angle α of 80 to 65 degrees, preferably 77 to 70 degrees, with respect to the central axis 926 of the container lid 2. This is very important. As will be understood from the Examples and Comparative Examples described below, if the angle α exceeds 80 degrees, the sealing performance of the mouth and neck when the container lid is attached to the mouth and neck will be excessively reduced; When the angle is smaller than 65 degrees, the required opening torque required to rotate the container lid 2 when removing the container lid 2 from the neck and opening the mouth and neck increases excessively.

On the other hand, the above-mentioned positioning of the annular projection 32Fi is not necessarily necessary, but as will be mentioned later, when the container lid 2 is attached to the mouth and neck of the container, the container lid 2 is guided and positioned as required with respect to the mouth and neck of the container. It is convenient for the device to be provided for this purpose, and any suitable form may be used as long as it can perform the intended function.

11- The container lid 2 as described above may be applied to a container having a neck portion generally designated by the numeral 36 in FIGS. 4 and 5. It can also be molded from other materials such as glass, but it can also be made from suitable synthetic resins (e.g. polyethylene terephthalate).
The illustrated neck 36 is provided at the upper end of a container known per se, which can be molded from (PET).
It has a cylindrical shape as a whole, and has three male threads on its outer circumferential surface.
8, and a locking 7 flange 4 located below this male thread 38.
0, and also a so-called conveying ring 42 located below the locking flange 40.

When attaching the container lid 2 to such a mouth and neck part 36 to seal the mouth and neck part 36, the container lid 2 is fitted onto the mouth and neck part 36. In this case, as can be easily understood by referring to FIG. 36, the container lid 212- is guided and positioned at a desired position, that is, a position where the container lid 2 is substantially concentric with the mouth and neck portion 36. Next, as shown in FIG.
The neck part 3 of the container is suspended by supporting the container.
6, the container lid 2 is pressed by the pressing tool 46.

The pusher 46, which is of well-known form per se, includes a central member 50 which is elastically biased downwardly by a relatively weak spring member 48 and a relatively strong spring member (not shown).
and an outer member 52 resiliently biased downwardly by. As can be easily understood by referring to FIG. 4, such a pressing tool 46 mainly presses the top wall of the metal shell 4 of the container lid 2 by a step 53 formed on the lower surface of the outer member 52. 8 and skirt wall 1
Apply pressing force to the boundary area with 0. This allows the third
As will be easily understood by comparing the figure with FIGS. 4 to 6, the boundary area of the metal shell 4 is deformed and the sealing annular ridge 30 of the liner 6 is inserted into the mouth portion 36. It is brought into close contact with the outside of the edge and deformed. While maintaining this condition, the neck portion 36 is applied to the main portion 14 of the skirt wall 10 by a thread-forming roller 54, which is known per se.
While forming the female thread 56 along the male thread 38 of the mouth part 36, the lower end of the pilfer-proofing 916 is deformed inwardly by the roller 57 to form a female thread 56, which is known per se. Lock it to the bottom surface of. Thus, the fifth
As shown in the figure and FIG. 6, the container lid 2 is attached to the neck part 36, and the neck part 36 is sealed.

When the container lid 2 is attached to the neck part 36, as clearly shown in FIG. be done. On the other hand, the annular protrusion 32 for positioning in the liner 6 may be brought into contact with the inner circumference of the edge of the neck part 36, but as clearly shown in FIG. It may be somewhat effective locally.

In order to detach the container lid 2 attached to the mouth and neck part 36 from the mouth part 36 and unseal the mouth and neck part 36 as described above, the container lid 2 must be rotated counterclockwise when viewed from above in FIG. urge In this way, since the female thread 56 formed on the main portion 14 of the skirt wall 10 is moved along the male thread 38 on the neck portion 36, the container lid 2 tends to move upward as it rotates. However, since the lower end of the pilfer-proof hem 16 is locked to the lower surface of the locking 7 flange 40 of the mouth portion 36, upward movement is prevented.

In this way, a considerable stress is generated on the plurality of weakened lives 28 formed in the pilfur-proof hem 16, and the weakened lines 28 are broken, so that the pilfer-proof hem 16 becomes a plurality of arc-shaped pieces. and each of the plurality of arcuate pieces is displaced outwardly in the natural direction about each of the bridging portions 20 in the line of weakness 12, thereby causing the locking 7 flange 4
It is separated from the bottom surface of 0. Then, the entire container lid 2 moves upward as it rotates and is separated from the neck part 36, and the neck part 36 is thus opened.

In the container lid 2 constructed according to the present invention, as described above, the lower surface 34 of the sealing annular protrusion 30 is at an angle of 80 to 65 degrees, preferably F, with respect to the central axis a26 of the container lid 2.
It extends outwardly and downwardly at an angle α of 77 to 70 degrees. Therefore, as will be understood from Examples and Comparative Examples to be described later, when the container lid 2 is attached to the mouth part 36, the mouth part 365c can be sealed against light, and the contents filled in the container can be sealed. is beer, and after filling the container with beer and before attaching the container lid 2 to the mouth s3616-, the beer in the container is foamed to flow out from the neck 36, and the container lid 2 is placed in the neck 36 of the container. Even if beer remains between the two after the container is attached and the residual beer solidifies over time, creating a so-called beer cement effect, when the container lid 2 is removed from the neck and neck 36 and the neck 36 is opened, The necessary opening torque required to rotate the container lid 2 can be made to a sufficiently low value.

Examples and Comparative Examples One side of an aluminum-based alloy plate with a thickness of 0.25 m was printed and coated with a vinyl-based protective lacquer, and the other side was coated with an epoxy paint containing polyethylene oxide.

Then, the metal plate was pressed so that the surface coated with the polyethylene oxide-containing epoxy paint was on the inside to form a metal shell as shown in FIG. High-pressure polyethylene (density -0
, 92, Melt Intex-4, 0), and press-molded it to form the mold shown in Figures 1 and 2.
thus forming a liner in the form of Example 1 of the present invention
Container lids Nos. 7 to 7 were produced. The dimensions of each part of the liner were as follows. In implementation @1 to 7, the outer diameter dl of the sealing annular protrusion...
・・35.9+u Inner diameter d2 of the elbow protrusion for sealing
・・・・・・・・・・・・32.5□The outer diameter of the annular protrusion for use is d5...31.1+m The inner diameter of the annular protrusion for use is d11...・・・・・・29.5+o+
The thickness of the base between the sealing ring elbow ridge and the positioning ring ridge is HO...1.
0■ Positioning is based on the inclination angle β of the lower surface (or the entire outer surface) of the annular protrusion.
...35 degrees, and the inclination angle α of the lower surface of the sealing annular protrusion
Example 1・・・・・・・・・・・・・・・・・・
・・・・・・80 degree example 2・・・・・・・・・・
・・・・・・・・・・・・78 degrees Example 3...
・・・・・・・・・・・・・・・・・・・・・7
7th Example 4・・・・・・・・・・・・・・・・・・
・・・・・・75 degree example 5・・・・・・・・・
・・・・・・・・・・・・・・・70 degree example 6...
・・・・・・・・・・・・・・・・・・・・・・・・
68 degrees Example 7・・・・・・・・・・・・・・・・・・
65 degrees On the other hand, for comparison, it is substantially the same as Examples 1 to 7 above, except that the inclination angle α of the lower surface of the sealing annular protrusion is as follows. Container lids, that is, Comparative Examples 1 to 4, were prepared.

Comparative example 1・・・・・・・・・・・・・・・・・・
・・・・・・83 degrees comparative example 2・・・・・・・・・・・・
・・・・・・・・・・・・81 degree comparative example 3...
・・・・・・・・・・・・・・・・・・・・・・・・6
3rd degree comparative example 4・・・・・・・・・・・・・・・・・・
...60 degrees However, in Comparative Example 3 and Comparative Example 4,! As shown in Fig. 7, the outer periphery of the lower surface of the sealing annular protrusion is made substantially flat, and the protrusion height H of the sealing annular protrusion is limited to 1.2 cm. 1
9- It was confirmed that the results of the required opening torque test and the sealability test described above were substantially the same as those without).

Using the container lids of Examples 1 to 7 of the present invention and Comparative Examples 1 to 4, the following required opening torque test and sealability test were performed.

(Required opening torque test) Edge outer diameter DI = 33.6 mm, edge inner diameter D2 =
Polyethylene terephthalate (PE
T) Commercially available draft beer was filled into a container for H.2. Next, air was blown onto the draft beer in the container to foam the draft beer and cause a portion to flow out from the mouth and neck.

Thereafter, for the containers of the first group, the container lids of Examples 1 to 7 and Comparative Examples 1 to 4 were attached to the necks of the containers in the same state as described with reference to FIG. I installed it. At this time, the central member of the 20-presser was elastically pressed against the container lid with a force of 5 KfO, and the outer member of the suppressor was elastically pressed against the container lid with a force of 180 KfO.

For the second group of containers, cleaning water was sprayed on the outer circumferential surface of the mouth part to wash away the draft beer that flowed out from the mouth and neck and adhered to the outer circumferential surface of the mouth and neck, and then the same method as described above was used in Example 1. The container lids of Comparative Examples 1 to 7 and Comparative Examples 1 to 4 were attached to the mouth of the container.

Regarding containers in the first and second groups above, the following
The required opening torque was measured by the third method.

In the first method, immediately after the container lid is attached to the mouth and neck of the container as described above, a torque is applied to the container lid in the opening direction to separate the container from the mouth and neck of the container, and the opening required at this time is The maximum value of torque was measured using a commercially available torque meter. The maximum value of the required opening torque was measured for 10 container lids of Examples 1 to 7 and Comparative Examples 1 to 4, and the average value was obtained, and the results shown in Table 1 below were obtained. In the second method, after attaching the container lid to the mouth and neck of the container as described above, the container is placed in a refrigerator at 5°C for one hour.
After leaving it for a week, the maximum required opening torque was measured in the same manner as above. Ten container lids of Examples 1 to 7 and Comparative Examples 1 to 4 were measured, and the average value was determined, and the results are shown in Table 2 below.

In the method shown in Table 2, after attaching the container lid to the mouth and neck of the container in the nine ways described above, the container is placed in a constant temperature room at 40°C for one hour.
After leaving it for a week, the maximum required opening torque was measured in the same manner as above. Ten container lids of Examples 1 to 7 and Comparative Examples 1 to 4 were measured and the average value was determined, and the results shown in Table 3 below were obtained.

Judging from the measurement results of Pass 9 in Table 3 above, in the case of the container lids of Comparative Examples 1 and 2 and Examples 1 to 7, the required opening torque is within the required range; It is understood that the required opening torque tends to be excessive in the case of container lids.

(Sealability Test) Commercially available draft beer was filled into the same container used in the above-mentioned required opening torque test. Next, the container lids of Examples 1 to 7 and Comparative Examples 1 to 4 were attached to the mouth and neck of the container as described above.

Thereafter, the container was inverted, and nitrous gas was injected into the container through a syringe needle passed through the lid of the container to increase the pressure inside the container to 11.2 h/cm2. and,
It was investigated whether beer leaked from the mouth and neck of the container. ◇ The above test was carried out on 10 container lids of Examples 1 to 7 and Comparative Examples 1 to 4.27- The number of beer leaks from the mouth and neck is
It was 9 as shown in Table 4 below.

Table 4 From the results shown in Table 4, the container lids of Comparative Examples 3 and 4 and Examples 1 to 7 can sufficiently seal the mouth and neck of the container, but 28- It is understood that in the case of the container lids of Comparative Examples 1 and 2, the sealing of the mouth and neck of the container was insufficient.

Although specific examples of the container lid constructed according to the present invention have been described in detail above, the present invention is not limited to such specific examples, and various modifications and changes can be made without departing from the scope of the present invention. It does not need much to say that this is possible.

For example, in the illustrated container lid, when the container lid attached to the mouth and neck of the container is removed from the mouth and neck, the plurality of weakened lines formed in the pilfer-proof hem are broken, and the pilfer-proof hem is broken. It has a so-called pilfer-proof characteristic in which the section is divided into a plurality of arc-shaped pieces,
The present invention is applicable to other types of container lids having pilfer-proof properties, for example, one lid formed on the pilfer-proof hem when the container lid attached to the neck of the container is removed from the mouth and neck. The weakened line is broken and the pilfur-proof hem is made into a band-like shape, and a portion of the weakened line in the circumferential direction that is formed on the skirt wall and divides the skirt wall into the main part and the pilfur-proof hem remains. When the container lid attached to the mouth and neck of the container is removed from the mouth and neck, the circumferential direction formed on the skirt wall and dividing the skirt wall into a main part and a pilfer-proof hem part is used. The weakened line of N is completely broken and the pilfer-proof hem is completely separated (therefore, the pilfer-proof hem N
It can also be applied to container lids such as 5rl'i (which are left in place without being detached from the mouth and neck), and can also be applied to container lids that do not have pilfer-proof properties. Furthermore, the illustrated container lid is of a so-called roll-on type in which female threads are formed on the skirt wall when the container lid is attached to the mouth and neck of the container. It can also be applied to a type of container lid formed with a.

Furthermore, in the illustrated container lid, the shell having the top wall and the skirt wall is made of metal, but if desired, the shell can also be made of a suitable synthetic resin material. In this case, the shell and liner can be formed from separate synthetic resin materials, or the shell and liner can be integrally formed from the same synthetic resin material.

[Brief explanation of the drawing]

FIG. 1 is a side view, partially in cross section, of a specific example of a container lid constructed according to the present invention. 2 is a partial sectional view showing a part of the container lid of FIG. 1; FIG. FIG. 3 is a partial sectional view showing a state in which the container lid of FIG. 1 is fitted onto the mouth and neck of the container. =31- FIG. 4 is a simplified sectional view showing a method of attaching the container lid of FIG. 1 to the mouth and neck of the container in a required hole. FIG. 5 is a side view, partially in section, showing the container lid of FIG. 1 attached to the mouth and neck of the container as required. FIG. 6 is a partial cross-sectional view showing the container lid of FIG. 1 attached to the mouth and neck of the container as required. FIG. 7 is a partial sectional view showing the shape of the sealing annular protrusion in the container lids prepared as Comparative Examples 3 and 4. 2... Container lid 4... Metal shell 6... Synthetic resin liner 8... Top wall 10... Skirt wall 30... Sealing annular protrusion 32... Positioning is for use Annular protrusion 32 - 34 ... Bottom surface of sealing annular protrusion 36 ... Mouth and neck of container

Claims (1)

[Scope of Claims] 1. A container lid for a container having a mouth part with a male thread formed on the outer peripheral surface, which comprises a top wall and a cylindrical skirt wall hanging from the periphery of the top wall. In a container lid of the type, the inner surface of the flat wall is formed with a synthetic resin sealing annular protrusion that is brought into close contact with the outer part of the edge of the mouth and neck; the lower surface of the sealing annular protrusion is . A container lid, characterized in that it is inclined outwardly and downwardly at an angle of 80 to 65 degrees with respect to the central axis. 2. Claim 1 in which the angle is 77 to 70 degrees
Container lid as described in section. 3. On the inner surface of the top wall, there is formed a lobe-like protrusion that is concentrically arranged inside the sealing annular protrusion. Container lid as described. 4. The top wall and the skirt wall are made of gold/14, and a synthetic resin liner is provided on the inner surface of the top wall, and the annular sealing ridge and the positioning ridge are 4. A container lid as claimed in claim 3 defined by said liner. 5. The skirt wall has a weakened line extending in the circumferential direction, and the skirt wall has a main part located above the weakened line and a pilfer-proof hem part located below the weakened line. A locking flange located below the male thread is formed on the outer peripheral surface of the mouth and neck, and when the container lid is attached to the mouth and neck, Put the lid on and apply pressure to the container lid to bring the sealing annular protrusion into close contact with the outer periphery of the edge of the mouth and neck, and while maintaining this state, press the skirt wall along the male thread. 5. The container lid according to claim 4, wherein a female thread is formed in the main portion, and the lower end of the pilfer-proof hem of the skirt wall is deformed inward to be locked to the lower surface of the locking flange. 6. When a container lid is fitted to the mouth and neck and a pressing force is applied to the container lid, the pressing force is mainly applied to the boundary area between the top wall and the skirt wall to deform the boundary area. The container lid described in item 5. 7. The container lid according to claims 1 to 6, wherein the container is made of synthetic resin. 8. The container lid according to claim 7, wherein the container is made of polyethylene terephthalate. 9. The container lid according to claim 8, wherein the container is filled with a carbonated beverage, and the carbonated beverage is foamed and flows out from the mouth and neck before attaching the container lid to the mouth and neck. .