JP2003072818A - Synthetic resin-made container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cap portion located at a closing position after mounting a container lid on a mouth neck portion of the container from rotating toward an opening position even when a relatively high temperature liquid is filled in the container, the container lid being a synthetic resin-made container lid equipped with a container body (4) and the cap portion (6), the container body having a bottom wall (10) having an area to be cut defined by a cutting line (24), a connecting sprue (42) extending upward from a cut starting portion (40) of the cut area (26) of the bottom wall and a pull ring (44) connected to the cut area via the connecting sprue, the cap portion being rotatably connected to the container body between a closing position to cover the bottom portion, the connecting sprue and the pull ring of the container body and an opening position to expose the bottom portion, the connecting sprue and the pull ring of the container body. SOLUTION: At least the cut starting end portion of the cut area has a relatively thin portion D1 but at least the central portion (48) of the cut area has a relatively thick portion D2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin container lid particularly suitable for a container containing a liquid such as a liquid seasoning, and more specifically, a container lid body and a container lid body pivotably connected to the container lid body. And a cap, the container lid body including a bottom wall having a cutout region defined by a rupturable line.

[0002]

As is well known to those skilled in the art, as a container lid for a container containing a liquid such as a liquid seasoning, a synthetic resin container lid having a container lid body and a cap portion is widely used. Have been served. The container lid body includes a bottom wall having a cutout region defined by a breakable line, a connecting column extending upward from a break start end of the cutout region of the bottom wall, and a pull ring connected to the cutout region through the connecting column. . The cap includes a top wall and a cylindrical skirt wall hanging from the peripheral edge of the top wall, and covers the bottom wall of the container lid body, the closed position that covers the connecting column and the pull ring, and the bottom wall of the container lid body, the connecting column and the pull ring. It is connected to the container lid body so as to be freely rotatable between the exposed open position. The rupturable line is ruptured by pivoting the crown cap to the open position and pulling on the pull ring with a finger and the cutout region is cut from the bottom wall to create the discharge opening.

[0003]

The conventional synthetic resin container lid having the above-mentioned form has the following problems to be solved. When the container was filled with a liquid having a relatively high temperature of about 70 to 90 ° C. and then the container lid was attached to the mouth and neck of the container to seal the mouth and neck of the container, the container was positioned at the closed position. The cap may be swung somewhat toward the open position. If the cap is pivoted somewhat towards the open position, it will be necessary to pivot the cap to the closed position before shipping. When the cooling water is sprayed onto the container lid after the container lid is attached to the mouth and neck of the container, the cooling water is swung slightly toward the open position and the container lid body. It invades through the gap between and and is deposited on the bottom wall of the container lid body.

As a result of diligent studies on the cause of the cap being pivotally moved toward the open position, it has been found that the cap is pivotally moved due to the following behavior. That is, when the container lid is mounted by filling a liquid of a considerably high temperature into the container, the air in the space existing at the upper end of the container, that is, the so-called head space, is heated by the heat conducted from the liquid, and The pressure rises, and as a result, the cutout area defined on the bottom wall of the container lid body bulges upward in a dome shape, and thus in the space between the bottom wall of the container lid body and the cap portion. The volume of space is reduced to increase the pressure, and the increased pressure causes the cap to pivot from the closed position. Further, the heat of the liquid is conducted to the air in the space between the bottom wall of the container lid body and the cap portion through the bottom wall of the container lid body, which also increases the pressure in the space portion. This also causes the crown cap to pivot from the closed position.

The present invention has been made in view of the above facts, and its main technical problem is to improve the synthetic resin container lid of the above-mentioned embodiment and to fill the container with a liquid of a considerably high temperature. The purpose of this is to prevent the cap portion, which has been positioned at the closed position after the container lid is attached to the mouth and neck of the container, from being swung somewhat toward the open position.

[0006]

DISCLOSURE OF THE INVENTION The inventors of the present invention are able to recognize the above-described behavior when the cap portion that has been positioned at the closed position is swung somewhat toward the open position. Based on this, the thickness of the cutout region defined on the bottom wall of the container lid main body is increased to increase its rigidity and at the same time the heat insulation effect of the cutout region of the bottom wall is increased to reduce the amount of heat conduction through the cutout region. It has been found that it is possible to effectively prevent the crown cap from being swung to the open position by swaging. On the other hand, if the wall thickness is increased over the entire cutout area, when the pull ring is pulled to break the breakable line, the cutout area is increased due to the increased rigidity of the entire cutout area. It becomes impossible to gradually bend the rupturable line according to the progress of rupture, and instead of gradually rupturing the rupturable line from the rupture start end, the rupturable line is simultaneously extended over a considerable length. Since it is necessary to break the breakable line, it tends to be considerably difficult to break the breakable line. In order to avoid the difficulty of breaking the rupturable line, the wall thickness is not increased over the entire cut area, and at least at the rupture start end, the wall thickness is relatively thin without increasing the wall thickness. It is important to keep it to a minimum.

Therefore, according to the present invention, as a synthetic resin container lid that achieves the above-mentioned main technical problems, the container lid main body and the crown cap portion are provided, and the container lid main body has a cutout region by a breakable line. The cap includes a defined bottom wall, a connecting column extending upward from a breaking start end of the cutout region of the bottom wall, and a pull ring connected to the cutout region via the connecting column, and the crown cap portion. A bottom wall of the container lid body, a closed position that covers the bottom wall of the container lid body, the connection column, and the pull ring, and the bottom wall of the container lid body, the connection column. And the open position for exposing the pull ring so that the cap is pivotally connected to the container lid body, the cap is pivoted to the open position, and the pull ring is hung by pulling with a finger. The feasible line is broken and the cutout area In a synthetic resin container lid that is cut from a wall to create a discharge opening, at least the breaking start end of the cutout region has a relatively thin wall thickness D1, but at least the central portion of the cutout region is relatively thick. Wall thickness D
There is provided a synthetic resin container lid characterized by having 2.

In the preferred embodiment, the perimeter of the cutout region has a relatively thin wall thickness D1. The relatively thin wall thickness D1 is 1.0 to 1.6 mm, and the relatively thick wall thickness D2 is
May be 1.7 to 3.0 mm.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, a more detailed description will be given with reference to the accompanying drawings illustrating a preferred embodiment of a synthetic resin container lid constructed according to the present invention.

1 to 3 show an example of a preferred embodiment of a container lid constructed according to the present invention. The container lid, generally designated by number 2, is integrally molded from a suitable synthetic resin such as polyethylene or polypropylene.
The container lid 2 includes a container lid body 4 and a cap portion 6, and the cap portion 6 is pivotally connected to the body 4 via hinge means 8.

The container lid main body 4 may have a substantially disk-shaped bottom wall 10.
Have. An outer hanging wall 12 and an inner hanging wall 14 are formed on the lower surface of the bottom wall 10. The outer hanging wall 12 has a substantially cylindrical shape and hangs downward from the outer peripheral edge of the bottom wall 10. The inner hanging wall 14 also has a substantially cylindrical shape, and hangs downward from the lower surface of the bottom wall 10 substantially concentrically with the outer hanging wall 12. An annular locking projection 16 is formed on the inner peripheral surface of the outer hanging wall 12 at the center in the axial direction so as to project inward in the radial direction. The lower portion of the outer peripheral surface of the inner hanging wall 14 has an arc shape in a cross-sectional view, and the outer diameter is gradually reduced downward.

An annular locking wall 18 is formed on the upper surface of the bottom wall 10. The locking wall 18 has a substantially cylindrical shape extending upward from the outer peripheral edge portion on the upper surface of the bottom wall 10, and an annular locking projection 20 protruding outward in the radial direction at the upper end of the outer peripheral surface thereof.
Are formed. A pouring guide wall 22 is provided on the upper surface of the bottom wall 10.
Is also formed. The pouring guide wall 22 has a substantially cylindrical shape extending upward from the upper surface of the bottom wall 10, and the upper end portion thereof is curved outward in the radial direction. 1 and 2, the pouring guide wall 22 is not concentric with the locking wall 18 and is displaced slightly to the left of the locking wall 18, and the right side region of the pouring guide wall 22 is The upper half is cut out. Further, a cutout region 26 is defined on the bottom wall 10 by a breakable line 24 having a good score. The breakable line 24 has a substantially arcuate portion 28 having a relatively large diameter.
And a pair of substantially chordal portions 32 connecting both ends of the substantially arcuate portion 28 and both ends of the substantially arcuate portion 30 and a substantially semi-circular portion 30 having a relatively small diameter, It is formed radially inward of the inner hanging wall 14 and the pouring guide wall 22. The cutout region 26 is composed of a circular subsidence portion 34, an annular peripheral edge portion 36, and a truncated cone tubular portion 38 interposed between the subsidence portion 34 and the peripheral edge portion 36. In the cutout region 26, a fracture start end portion 40 defined by the substantially semi-circular arc portion 30 is disposed on the right side of the peripheral edge portion in FIGS. 2 to 3. Such break start end portion 40
A connecting column 42 extends upward from the upper surface of the above, and a pull ring 44 is connected to the cutout region 26 via the connecting column 42. The pull ring 44 extends substantially horizontally from the upper end of the connecting column 42, and is arranged substantially concentrically with the pouring guide wall 22. On the inner peripheral surface of the pull ring 44, three arc-shaped protrusions 46 are formed at intervals in the axial direction to prevent slippage of a finger hung on the pull ring 44.

Continuing the description with reference to FIGS. 1 and 3,
In the container lid 2 constructed according to the present invention, at least the breaking start end portion 40 of the cutout region 26 has a relatively thin wall thickness D1, but at least the central portion 48 of the cutout region 26 has a relatively thick wall thickness D2. It is important to have.
In the illustrated embodiment, not only the fracture start end 40 of the cutout region 26 but also the entire peripheral edge portion 50 of the cutout region 26 has a relatively thin wall thickness D1. The region excluding the peripheral portion 50 has a relatively thick wall thickness D2 (in FIG. 3, the region shown by the dotted line has a relatively thin wall thickness D1 and the region shown by the diagonal line has a relatively thick wall thickness D2. ). Relatively thick wall thickness D1 is 1.0
Is about 1.6 mm, and the relatively thin wall thickness D2 is 1.
It is preferably about 7 to 3.0 mm.

The cap 6 includes a circular top wall 52 and a cylindrical skirt wall 54 depending from the peripheral edge of the top wall 52 (extending upward in the state shown in FIG. 1). A cylindrical seal wall 56 that hangs downward (extends upward in the state shown in FIG. 1) is also formed on the inner surface of the top wall 52. The seal wall 56 is not concentric with the skirt wall 54, but is displaced slightly to the right with respect to the skirt wall 54 in FIGS. 1 and 2 (the cap 6 is shown in the closed position indicated by the chain double-dashed line in FIG. 1). The skirt wall 54 is located concentrically with the locking wall 18 of the container lid body 4,
The seal wall 56 is located concentrically with the pouring guide wall 22 of the container lid body 4). The inner wall of the top wall 52 further hangs downward (extends upward in the state shown in FIG. 1).
An arcuate wall 58 is also formed. The arc-shaped wall 58 is arranged so as to extend in an arc shape at a predetermined angle portion outside the seal wall 56. An annular locking groove 60 is formed at the free end of the inner peripheral surface of the skirt wall 54. A projecting piece 62 that projects outward in the radial direction is formed at the lower end of the outer peripheral surface of the skirt wall 54.

FIG. 1 also shows the mouth / neck portion 64 of the container to which the container lid 2 is applied. The mouth neck 64 of the container, which can be formed of glass or an appropriate synthetic resin such as polyethylene terephthalate, has a substantially cylindrical shape, and has an annular locking jaw 66 projecting outward in the radial direction at the upper end of the outer peripheral surface thereof. Has been formed.

When the container lid 2 is attached to the mouth / neck portion 64 of the above-mentioned container containing a liquid such as a liquid seasoning, and the container is sealed, the mouth / neck portion 64 is fitted with the container lid 2 and the closed position. When a pressing force is applied to the outer surface of the top wall 52 of the crown cap portion 6 located at, the inner hanging wall 14 of the main body 4 is brought into close contact with the inner peripheral surface of the mouth / neck portion 64, and is somewhat radially inward. It is deflected, thereby sealing the mouth neck 64 of the container. On the other hand, the locking projection 16 formed on the inner peripheral surface of the outer hanging wall 12 of the main body 4
Is a locking jaw portion 6 formed on the outer peripheral surface of the mouth / neck portion 64.
6 is elastically overridden and locked below the locking jaw 66.

At least the central portion 48 of the cutout region 26 has a relatively thick wall thickness D2 and has a relatively large rigidity, so that the cutout region is increased even if the pressure in the space 68 existing at the upper end of the container increases. The dome-shaped bulge of 26 is effectively avoided. Moreover, since at least the central portion 48 of the cutout region 26 has a relatively large wall thickness D2, the cutout region 26 has a relatively large heat insulating effect, and the container lid body 4 is caused by the liquid having a considerably high temperature in the container. It is effectively prevented that the temperature of the air in the space between the bottom wall 10 and the cap portion 6 at is excessively increased.

Continuing the description with reference to FIG. 1, when the liquid contained in the container is discharged, the cap 6 is swung from the closed position shown by the chain double-dashed line to the open position shown by the solid line. . Next, a finger is put on the pull ring 44 to pull it to the upper left in FIG. 1 to break the breakable line 24. When the breakable line 24 is broken, stress is concentrated on the break starting end 40 by locally bending the break starting end 40 upward, and the break starting end 40 has a relatively thin wall thickness D1. Therefore, the breaking of the breakable line 24 can be started sufficiently easily because the displacement curve is upward. Further, in the illustrated embodiment, not only the fracture start end portion 40 of the cutout region 26 but also the peripheral edge portion 50.
Has a relatively thin wall thickness D1, the peripheral edge portion 50 is gradually displaced and curved upward, and the breakage of the breakable line 24 gradually progresses. Regarding the fact that not only the fracture start end 40 of the cutout region 26 but also the peripheral edge 50 has a relatively thin wall thickness D1, the following facts should be noted. That is, the peripheral part 5
When 0 also has a relatively large wall thickness D2, the breakable line 24 due to heat shrinkage during cooling in the molding process of the container lid 2
A considerable tensile force acts on the rupturable line 24, which may break the rupturable line 24.
Has a relatively thin wall thickness D1, thermal contraction is reduced, and therefore the tensile force acting on the breakable line 24 is reduced, and breakage of the breakable line 24 is prevented. When the breakable line 24 is broken, the cutout region 26 of the bottom wall 10 along with the pull ring 44 and the connecting column 42 is separated from the container lid body 4 and a discharge opening is created in the bottom wall 10. After that, by tilting the entire container,
The liquid can be discharged through the discharge opening. The liquid poured out through the discharge opening is guided by the pouring guide wall 22 of the container lid body 4 and smoothly poured out. When the pouring of the required amount of liquid is completed, the cap 6 is swung to the closed position indicated by the chain double-dashed line. As a result, the outer peripheral surface of the seal wall 56 of the cap 6 is brought into close contact with the upper portion of the inner peripheral surface of the pouring guide wall 22 of the container lid body 4, whereby the mouth / neck portion 64 of the container is temporarily sealed. .

[0019]

In the synthetic resin container lid of the present invention,
Even when the container is filled with a liquid of a considerably high temperature, the cap that was placed in the closed position after the container lid was attached to the mouth and neck of the container can be swung somewhat toward the open position. Is prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of a synthetic resin container lid configured according to the present invention with a cap portion in an open state.

FIG. 2 is a top view of the container lid shown in FIG.

FIG. 3 is a bottom view of the container lid shown in FIG.

[Explanation of symbols]

2: Container lid 4: Main body 6: Cap 10: Bottom wall 24: Breakable line 26: Cutout area 40: Breaking start end 42: Connection pillar 44: Pull ring 48: central part 50: Perimeter 52: Top wall 54: Skirt wall

Continued front page    (72) Inventor Yoichi Tsujiguchi             2-12 Mayoroto, Hiratsuka City, Kanagawa Prefecture Japan Crow             Hiratsuka factory (72) Inventor Tetsuro Ienaga             2-12 Mayoroto, Hiratsuka City, Kanagawa Prefecture Japan Crow             Hiratsuka factory (72) Inventor Tsuyoshi Ota             2-12 Mayoroto, Hiratsuka City, Kanagawa Prefecture Japan Crow             Hiratsuka factory F-term (reference) 3E084 AA12 BA02 CA01 CC04 CC05                       DB03 DC04 DC05 EA02 EB04                       FA03 FC08 GA06 GB06 HA05                       HB02 HC03 HD03 HD04 KA14                       KB01 LA03 LB02 LB07 LD01

Claims (3)

[Claims] 1. A bottom wall comprising a container lid main body and a cap, the container lid main body having a cutout region defined by a rupturable line, and upward from a rupture start end of the cutout region of the bottom wall. And a pull ring connected to the cutout region through the connecting column, the cap portion including a top wall and a cylindrical skirt wall hanging from a peripheral edge of the top wall, and the container lid. A closed position that covers the bottom wall of the main body, the connection column and the pull ring, and a closed position that exposes the bottom wall of the container lid body, the connection column, and the pull ring, is pivotally connected to the container lid body. The rupturable line is broken by pivoting the crown cap to the open position and pulling the finger on the pull ring to cut the cutout region from the bottom wall to create a discharge opening. In the synthetic resin container lid, At least 該破 sectional initiation end has a relatively thin wall thickness D1, at least the central portion of the 該切 preparative region has a relatively thick wall thickness D2, plastic container closure, characterized in that. 2. The peripheral portion of the cutout region has a relatively thin wall thickness D.
The synthetic resin container lid according to claim 1, which has 1. 3. The relatively thin wall thickness D1 is 1.0 to 1.
6 mm, and the relatively thick wall thickness D2 is 1.7 to 3.
The synthetic resin container lid according to claim 1 or 2, which is 0 mm.