JP5203414B2 - Container lid - Google Patents

Description

  The present invention relates to a container lid comprising a shell made of a thin metal plate having a top wall and a skirt wall depending from the periphery of the top wall, and a synthetic resin liner disposed on the inner surface of the top wall.

  As is well known, recently, as a container for beverages such as coffee, a metal thin plate container having a curl formed at the upper end and a male thread formed on the outer peripheral surface has been widely used. . As a container lid particularly suitable for such a metal sheet container, a container lid composed of a metal sheet shell and a synthetic resin liner has been proposed as disclosed in Patent Documents 1 and 2 below. Yes. The sheet metal shell has a top wall and a skirt wall depending from the periphery of the top wall. The synthetic resin liner is disposed on the inner surface of the top wall and has a thin circular central portion and a thick annular portion surrounding the central portion.

JP 2001-139053 A Japanese Patent Laid-Open No. 2003-175972

  Thus, the conventional container lid of the above-described form has the following problems to be solved. For example, if vibration is applied to the container before opening the mouth and neck of the container, the liquid in the container tends to adhere to the lower surface of the liner in the container lid, particularly the lower peripheral edge of the thin circular center, and is held there. There is. The reason why the liquid adhering to the lower surface of the liner is held in the container without falling into the container is not necessarily clear, but there are microscopic unevenness on the lower surface of the liner. It is presumed to be caused by holding force or the like due to cooperation with surface tension. When the container lid is removed from the mouth and neck of the container while the liquid is held at the peripheral edge of the thin circular center part of the liner, and the container cover is tilted from the horizontal state, the peripheral edge part of the thin circular center part of the liner The liquid adhering to the fluid flows in the circumferential direction along the lower surface of the liner and concentrates at a specific angle portion, that is, the lowermost portion of the peripheral surface of the lower surface of the thin circular central portion. When the liquid concentrates on a specific part and becomes relatively large in volume, it cannot be held on the lower surface of the liner and may flow out of the container lid and cause problems such as adhering to the clothes of consumers.

  The present invention has been made in view of the above facts, and the main technical problem is that the container lid of the above-described form is improved and the container lid detached from the mouth and neck of the container is tilted. The liquid adhering to the lower surface of the liner is sufficiently prevented or suppressed from flowing out of the container lid.

According to the present invention, the six or more ribs having a unique shape are spaced in the circumferential direction between the lower peripheral edge of the thin circular central portion of the synthetic resin liner and the upper end of the inner peripheral surface of the thick peripheral portion. By arranging the above, the main technical problem is achieved.

That is, according to the present invention, as a container lid that achieves the main technical problem, a metal thin plate shell having a top wall and a skirt wall hanging from the periphery of the top wall, and an inner surface of the top wall of the shell The liner has a thin circular central portion and a thick peripheral portion surrounding the central portion, and the thick peripheral portion is a cylindrical inner periphery extending vertically. have a surface, the said skirt wall of the shell, after mounted on the neck of the container, a container lid female threaded strip is formed along the male screw strip of the mouth-and-neck portion,
Between the lower peripheral edge of the central part and the inner peripheral upper end of the thick peripheral part, six or more ribs extending in the radial direction at equal angular intervals in the circumferential direction are disposed,
And each of said ribs is inclined downward toward the upper edge and the radially outwardly connected to the lower surface peripheral portion of the inner peripheral surface upper portion connected to the outer edge and the central portion of the thick peripheral portion have a gradient free edge extending, side surfaces located on both circumferential sides of each of said ribs has a substantially right-angled triangular shape extending vertically, and a lower surface peripheral edge portion of each of the ribs the central portion of the liner A container lid is provided which is characterized in that it is only present .

In the container lid of the present invention, even if the container lid is tilted, the liquid adhering to the peripheral edge of the lower surface of the thin circular central portion of the liner is prevented from flowing in the circumferential direction by the presence of six or more ribs. is, liquids that are sufficiently prevented or suppressed that flows out of the container closure to concentrate in a specific angle portion of the lower surface peripheral portion of the thin circular central portion of the liner to hide.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows a part with cross-section the preferred embodiment of the container lid comprised according to this invention with the mouth neck part of the container to which this is applied. The expanded sectional view which expands and shows a part of FIG. The bottom view of the container lid shown in FIG. The front view which shows a state with the container lid of FIG. 1 attached to the mouth neck part of the container of FIG. The expanded sectional view which expands and shows a part of FIG.

  Hereinafter, with reference to an accompanying drawing, a suitable embodiment of a container lid constituted according to the present invention is described in detail.

  FIG. 1 shows a typical example of the mouth and neck of a container to which such a container lid is applied, together with a preferred embodiment of a container lid constructed according to the present invention. The mouth and neck portion 2 of the container, which can be formed from an appropriate metal thin plate such as a chromic acid-treated steel thin plate, an aluminum based alloy thin plate, or a tin thin plate, has a substantially cylindrical shape as a whole, and has a male screw at the axial center portion. A strip 4 is formed, and a locking jaw 6 having an annular bulging shape is formed below the male screw 4. The upper part of the mouth-and-neck part 2 has a truncated cone shape whose diameter gradually decreases upward, and an outer curl 8 is formed at the upper end of the mouth-and-neck part 2. In the cross-sectional view, the curl 8 extends upward, extends in an arc shape upward and radially outward, extends in an arc shape downward and radially outward, extends downward, and downward and radially inward. Extending in a circular arc shape toward the top and further extending in a circular arc shape upward and radially inward. Since the metal container itself provided with such a mouth-and-neck portion 2 is well known, detailed description of the metal container itself is omitted in this specification.

  Continuing the description with reference to FIG. 1, the container lid denoted as a whole by the number 10 is composed of a thin metal sheet shell 12 and a synthetic resin liner 14. The thin metal plate shell 12 is formed of a suitable thin metal plate, preferably an aluminum-based alloy thin plate having a thickness of about 0.15 to 0.30 mm. The shell 12 is suspended from the circular top wall 16 and the periphery of the top wall 16. And a substantially cylindrical skirt wall 18.

  In the illustrated embodiment, the entire top wall 16 of the shell 12 extends substantially horizontally. A circumferential weakening line 20 is formed below the skirt wall 18 of the shell 12, and the skirt wall 18 has a main portion 22 above the circumferential weakening line 20 and a tamper evidence below the circumferential weakening line 20. It is partitioned into a skirt portion 24. In the illustrated embodiment, an annular bulging portion 26 is formed at the lower part of the skirt wall 18, and the circumferential weakening line 20 is disposed in the annular bulging portion 26, and is spaced apart in the circumferential direction. And a plurality of slits 28 extending in the circumferential direction and a bridging portion 30 existing between the slits 28. An annular groove 32 is formed in the upper part of the skirt wall 18. A so-called knurl 34 in which irregularities are alternately present in the circumferential direction is formed in a region of the skirt wall 18 above the annular groove 32. The upper edge of the recess in the knurl 34 is cut and displaced radially inward, whereby a plurality of relatively small openings 36 are formed at the upper edge of the skirt wall 18 at intervals in the circumferential direction. Yes.

  The description will be continued with reference to FIG. 2 together with FIG. 1. The synthetic resin liner 14 has a disc shape as a whole and is disposed on the inner surface of the top wall 16 of the shell 12. The liner 14 supplies a suitable synthetic resin, for example, a styrene elastomer containing SEBS (styrene-ethylene-butadiene-styrene) block copolymer to the inner surface of the top wall 16 of the shell 12 in a softened or molten state. It can be conveniently formed by pressing a molding die against such a synthetic resin and performing so-called embossing.

The liner 14 has a thin circular central portion 38 and a thick peripheral portion 40 surrounding the central portion 38. The thickness of the central portion 38 may be substantially the same throughout, and the lower surface of the central portion 38 extends substantially horizontally. On the other hand, the thick peripheral edge 40 has an outer annular ridge 44 projecting downward, an inner annular ridge 46 projecting downward, and an interposition located between the outer annular ridge 44 and the inner annular ridge 46. Part 48. Outer annular ridge 44 in the illustrated embodiment, the cylindrical outer circumferential surface 44a extending vertically on the real quality, the inner circumferential surface 44c of the frustoconical inclined upward toward the bottom surface 44b and the radially inner extending substantially horizontally Have The inner annular ridge 46 has an outer peripheral surface 46a substantially composed of a truncated cone-shaped upper portion inclined downward inward in the radial direction, a substantially cylindrical intermediate portion extending vertically, and a lower portion having a circular cross section. It has a lower surface 46b that extends horizontally and a cylindrical inner circumferential surface 46c that extends substantially vertically. The lower surface of the interposition part 48 extends substantially horizontally. The upper end of the cylindrical inner peripheral surface 46c of the inner annular ridge 46 and the lower peripheral edge of the thin circular central portion 38 are connected by a connecting portion having an arc shape with a small curvature radius in the cross section.

As clearly understood by referring to FIG. 2 and FIG.
In the container lid 10 configured according to the present invention, between the lower surface peripheral portion of the thin circular central portion 38 of the liner 14 and the upper end portion of the inner peripheral surface 46c of the inner annular protrusion 46 of the thick peripheral portion 40, it is important that the rib 50 on the six or more of Ru radially extending are disposed at equal angular intervals in the circumferential direction. In the illustrated embodiment, twelve ribs 50 are formed at equiangular intervals. Each of the ribs 50 is inclined downwardly outward in the radial direction from an outer edge 50a connected to the inner peripheral surface 46c of the inner annular protrusion 46 and an upper edge 50b connected to the lower peripheral edge of the central portion 38. extending inclined possess a free edge 50c, the side surfaces positioned on both sides in the circumferential direction is substantially right-angled triangular shape extending vertically, and the thin circular as liner 14 it will be clearly understood from FIG. 3 and FIG. 4 It exists only at the peripheral edge of the central portion 38.

  When the container lid 10 is attached to the mouth / neck portion 2 and the mouth / neck portion 2 is sealed after the container is filled with the liquid beverage, the container lid 10 is placed on the mouth / neck portion 2 as shown in FIGS. To fit. In this way, the upper part of the inner peripheral surface 44 c of the outer annular protrusion 44 in the liner 14 or the lower surface of the interposition part 48 is brought into contact with the upper end or upper surface of the outer peripheral surface of the curl 8 of the mouth-and-neck part 2. The outer peripheral surface 46 a of the inner annular protrusion 46 of the liner 14 is positioned close to the inner peripheral surface of the curl 8. Next, as clearly shown in FIGS. 4 and 5, the pressing tool 52 having a flat lower surface is pressed against the top wall 16, and the pressing tool 54 having a shoulder 56 facing downward is connected to the top wall 16 and the skirt wall. 18 is applied to the boundary region with 18 to immerse the boundary region downward and radially inward. Thus, as clearly understood by comparing and referring to FIGS. 1 and 2 and FIGS. 4 and 5, the interposition part 48 in the thick peripheral edge 40 of the liner 14 is lowered so that the top surface of the curl 8 The inner peripheral surface 44c of the outer annular ridge 44 is pressed against the upper half of the outer peripheral surface of the curl 8 while being in close contact with the upper portion of the inner peripheral surface, and thus the mouth and neck portion 2 is sealed. Further, the thread forming tool 58 is made to act on the skirt wall 18 so that the female thread is applied to the skirt wall 18 along the male thread 4 of the mouth-and-neck portion 2 downward from the annular groove 32 formed in the skirt wall 18. 60, and the locking tool 62 is applied to the tamper evidence skirt 24 of the skirt wall 18 to force the tamper evidence skirt 24 radially inward to lock the jaw 6 of the mouth neck 2. Lock it on. The configurations of the pressing tools 52 and 54, the thread forming tool 58, and the locking tool 62, and the lid tightening by these may be in a form well known to those skilled in the art, and therefore a detailed description thereof will be omitted in this specification. .

  As shown in FIGS. 4 and 5, the outer peripheral surface 46 a of the inner annular protrusion 46 of the liner 14 is in close contact with the inner peripheral surface of the curl 8 even when the container lid 10 is attached to the mouth and neck 2 as required. It is preferable that they are close to each other with a slight gap therebetween. When the outer peripheral surface 46a of the inner annular ridge 46 is brought into close contact with the inner peripheral surface of the curl 8, the torque required for opening the mouth-and-neck portion 2 tends to be excessive as described later. On the other hand, when the outer peripheral surface 46a of the inner annular ridge 46 is relatively far away from the outer peripheral surface of the curl 8, for example, when vibration is applied to the container, the outer peripheral surface 46a of the inner annular ridge 46 and the inner periphery of the curl 8 There is a tendency for liquid to be trapped between the surfaces. When the inside of the container is in a pressurized state when opening the mouth-and-neck part 2, the pressure in the container when the container lid 10 is detached from the mouth-and-neck part 2 is changed from the outer peripheral surface 46 a of the inner annular protrusion 46. It acts on the liquid trapped between the curl 8 and the inner peripheral surface of the curl 8 and causes the liquid to scatter to the outside through the opening 36 formed in the shell 12 of the container lid 10 or inside the skirt wall 18 of the shell 12. There is a risk that it may adhere to the peripheral surface or the outer peripheral surface of the mouth / neck portion 2 of the container.

  When the contents of the mouth and neck 2 of the container are opened and the contents are consumed, the container lid 10 is rotated in the opening direction, that is, counterclockwise as viewed from above in FIG. Thus, the container lid 10 is raised along with the rotation by the cooperation of the male thread 4 of the mouth and neck portion 2 and the female thread 60 of the container lid 10. However, the tamper evidence skirt portion 24 in the shell 12 of the container lid 10 is locked to the locking jaw portion 6 of the mouth-and-neck portion 2, so that it is prevented from rising, and thereby the bridge of the circumferential weakening line 20 of the shell 14. A considerable stress is generated in the tangle 30, the circumferential break line 20 is broken, and the tamper evidence skirt 24 is separated from the main portion 22 of the skirt wall 18. After the circumferential break line 20 is broken and the tamper evidence skirt 24 is separated from the main portion 22 of the skirt wall 18, the tamper evidence skirt 24 remains in the mouth and neck 2 and the container lid 10 is removed. The mouth and neck 2 is detached and the mouth and neck 2 is opened. The opening 36 formed in the shell 12 functions as a so-called vent in the opening operation stage of the mouth and neck portion 2.

  For example, when vibration is applied to the container before opening the mouth-and-neck part 2 of the container, the liquid that is the contents of the container adheres to the lower surface of the liner 14 in the container lid 10, particularly to the peripheral edge of the lower surface of the thin circular central part 38. And tend to be held there. In such a state, when the container lid 10 is detached from the mouth-and-neck portion 2 and then the container lid 10 is tilted from a substantially horizontal state, the liquid held on the lower surface of the thin circular central portion 38 is directed toward the lowermost portion. Tends to flow in the circumferential direction. However, in the container lid 10 configured in accordance with the present invention, the gap between the lower peripheral edge of the thin circular central portion 38 of the liner 14 and the upper end portion of the inner peripheral surface 46c of the inner annular protrusion 46 of the thick peripheral edge 40 is shown. Since the plurality of ribs 50 are disposed at intervals in the circumferential direction, the flow of the liquid in the circumferential direction is effectively prevented. Accordingly, it is possible to effectively prevent or suppress the liquid from being concentrated at a specific angle portion of the peripheral portion of the thin circular central portion 38 of the liner 14, that is, the lowermost portion and flowing out from the container lid 10. .

    When only a part of the contents in the container is consumed, the container lid 10 that has been detached from the mouth-and-neck part 2 is again fitted on the mouth-and-neck part 2 and closed, that is, when viewed from above in FIG. Then, the female thread 60 of the container lid 10 is screwed again to the male thread 4 of the mouth-and-neck part 2, and thus the container lid 10 is mounted again on the mouth-and-neck part 2 and the mouth-and-neck part 2 is temporarily attached. Can be sealed. In the illustrated embodiment, when the container lid 10 is detached from the mouth-and-neck portion 2 and the mouth-and-neck portion 2 is opened, the circumferential break line 20 is broken over the entire circumferential direction so that the tamper-evident skirt portion 24 is formed. Although completely separated from the main part 22 of the skirt wall 18, if desired, one or more axial break lines are provided at the tamper evidence skirt 24, and the container lid 10 is detached from the neck 2. Then, when opening the mouth neck 2, the circumferentially broken line 20 is not completely broken, but a part of the circumferentially broken line 20 remains, and the axially broken line is broken so that the tamper evident skirt 24 is formed. The container lid 10 that is developed from an endless annular shape into an end-band shape and that includes the tamper evidence skirt 24 can be detached from the mouth-and-neck portion 2.

2: Container neck and neck 10: Container lid 12: Shell 14: Liner 16: Shell top wall 18: Shell skirt wall 38: Thin circular center part of liner 40: Thick peripheral edge part of liner 44: Outer annular protrusion Article 46: Inner annular protrusion 48: Interposition part 50: Rib

Claims (1)

A thin sheet metal shell having a top wall and a skirt wall depending from the periphery of the top wall, and a synthetic resin liner disposed on the inner surface of the top wall of the shell, the liner having a thin circular center parts and have a thick peripheral portion surrounding the central portion, the thick peripheral portion have a cylindrical inner peripheral surface extending vertically, the said skirt wall of the shell, the neck of the container In the container lid in which the female thread is formed along the male thread of the mouth and neck after mounting ,
Between the lower peripheral edge of the central part and the inner peripheral upper end of the thick peripheral part, six or more ribs extending in the radial direction at equal angular intervals in the circumferential direction are disposed,
And each of said ribs is inclined downward toward the upper edge and the radially outwardly connected to the lower surface peripheral portion of the inner peripheral surface upper portion connected to the outer edge and the central portion of the thick peripheral portion have a gradient free edge extending, side surfaces located on both circumferential sides of each of said ribs has a substantially right-angled triangular shape extending vertically, and a lower surface peripheral edge portion of each of the ribs the central portion of the liner A container lid characterized in that it exists only in the container lid.

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