JPH0786020B2 - Composite container lid - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a composite container lid including an outer lid made of synthetic resin and an inner lid made of metal, and more specifically, the inside of the vessel is appropriately kept in a depressurized state until it is opened. The present invention relates to a composite container lid having a so-called proof characteristic (also referred to as a safety button characteristic) indicating that the container lid is released, and a so-called pill fur proof characteristic that displays a trace once the container lid is detached from the mouth and neck of the container.

[Conventional technology]

JP-B-57-20523 and JP-A-61-259960 disclose a composite container lid including a synthetic resin outer lid and a metal inner lid held in the outer lid. The outer lid is
It has an annular top wall having an opening in the center and a cylindrical skirt wall hanging down from the peripheral edge of the top wall. A female thread is formed on the inner peripheral surface of the skirt wall, and a holding projection is formed above the female thread. The inner lid has a circular top surface wall and a cylindrical skirt wall hanging down from the peripheral edge of the top surface wall, and is inserted into the space above the holding ridges of the outer lid. The central portion of the top wall of the inner lid has a convex shape that bulges upward in a state before the container lid is attached to the mouth and neck of the container.

A container to which such a composite container lid is applied has a cylindrical mouth-neck portion, and a male thread is formed on the outer peripheral surface of the mouth-neck portion. The contents are filled in the container in a heated state. Then, before the contents are cooled, the container lid is attached to the mouth and neck to seal the mouth and neck. After that, when the contents are cooled and a reduced pressure state is generated in the container, the central portion of the top wall of the inner lid is deformed into a concave shape protruding downward, as long as the reduced pressure state is maintained in the container. , Indicating to the consumer that the inside of the container is maintained in a depressurized state by being held in such a concave shape.

[Problems to be Solved by the Invention]

Therefore, the conventional composite container lid as described above has the following problems due to the lower end of the skirt wall of the inner lid being defined by the sharp cutting edge generated during the press forming. Exists.

First, when the inner lid and the outer lid are combined, the skirt wall of the outer lid and / or the skirt wall of the inner lid is elastically deformed so that the inner lid elastically holds the retaining ridge of the outer lid. It is necessary to allow it to pass through, but in this case, a sharp cutting edge present at the lower end of the skirt wall of the inner lid is formed on the inner peripheral surface of the skirt wall of the outer lid, and the retaining ridge and the female screw are formed. It may damage the strip.

Secondly, when forming the inner lid from a tin plate or a chromic acid treated steel sheet, the rust preventive coating is broken at the sharp cutting edge produced during press forming, and therefore the bottom edge of the skirt wall of the inner lid is damaged. However, when the composite container lid is removed from the mouth and neck of the container, the lower end of the skirt wall of the inner lid where the rust is generated is easily visible, which gives a consumer discomfort.

Thirdly, in the opening operation for separating the lid of the composite container from the mouth / neck of the container, it is desired that only the outer lid is first rotated in the opening direction, and then the inner lid and the inner lid are raised together with the rotation. When the opening operation is performed by such a procedure, the initial rotational force required to start the rotation of the outer lid and the inner lid adsorbed on the mouth and neck are required to separate from the mouth and neck. Since force is required sequentially rather than simultaneously, opening can be accomplished with sufficient ease, while in conventional composite container lids, the sharp cutting edges present at the lower end of the skirt wall of the inner lid are The outer cover bites into the retaining ridges, which impedes the relative rotation of the outer lid with respect to the inner lid in the initial stage of opening, and therefore tends to cause excessive torque during the opening operation.

Fourth, from the viewpoint of resource reuse, after removing the composite container lid from the mouth and neck of the container, it is possible to separate the metal inner lid from the synthetic resin outer lid and collect them separately. As desired, it is considerably difficult, if not impossible, to disengage the inner lid from the outer lid because the sharp cutting edges present at the lower end of the skirt wall of the inner lid bite into the retaining ridges of the outer lid.

Furthermore, the conventional composite container lid has the following fifth and sixth problems.

That is, fifth, the rigidity of the inner lid is not always sufficient, and excessive so-called warpage is generated in the top wall and the skirt wall of the inner lid, which may cause poor sealing of the mouth and neck of the container. is there.

Sixth, in recent years, in addition to the guarantee characteristic that the inside of the container was properly depressurized until opening, the trace is displayed once the container lid is detached from the mouth and neck of the container. Although it is often desired to have so-called pull-fur proof characteristics, such demand is not satisfied.

The present invention has been made in view of the above facts, and a technical problem to be solved is to solve all of the above first to sixth problems existing in a conventional lid of a composite container.

[Means for Solving the Problems]

As a result of earnest research, the present inventors have formed a circumferentially extending rupture line on the skirt wall of the outer lid, and the skirt wall has a main portion above the rupture line and a pilfer proof hem portion below the rupture line. The female thread and the retaining projection are formed on the inner peripheral surface of the main part of the skirt wall, and the inner peripheral surface of the pill fur proof hem is formed on the outer peripheral surface of the neck and neck. Form a locking projection that can be locked to the stop jaw, and further, form an outer curl at the lower end of the skirt wall of the inner lid, and set the inner diameter of the retaining ridge of the outer lid to something other than the outer curl of the inner lid. It is larger than the maximum outer diameter of the part but smaller than the outer diameter of the outer curl, and the inner lid is held inside the outer lid by the cooperation of the outer curl and the retaining ridges. To solve all of the above-mentioned first to sixth problems existing in the composite container lid of We have found that it is possible.

That is, according to the present invention, as a composite container lid that achieves the above-mentioned technical problem, it has a cylindrical mouth-neck portion, and a male screw thread is provided on the outer peripheral surface of the mouth-neck portion and below the male screw thread. The mouth and neck of the container in which the annular locking jaw is formed is a composite container lid that is mounted after the contents are filled in a heated state and before the contents are cooled. The lid includes a lid and a metal inner lid, and the outer lid includes an annular top wall having an opening in the center and a cylindrical skirt wall hanging down from the peripheral edge of the top wall. A rupture line extending to the skirt wall, and the skirt wall is divided into a main portion above the rupture line and a pill fur-proof skirt below the rupture line, and the main portion of the skirt wall On the inner peripheral surface of the female screw thread, which is screwed into the male screw thread of the mouth and neck, and the female screw thread. A retaining projection is formed above the thread, and a locking projection is formed on the inner peripheral surface of the pill fur proof hem that is locked to the annular locking jaw of the mouth and neck. The inner lid includes a circular top wall and a cylindrical skirt wall hanging down from the peripheral edge of the top wall, and is housed in a space above the holding ridge in the outer lid. The central portion of the top wall of the lid has a convex shape that bulges upward in a state before the container lid is attached to the mouth and neck, and is filled in the container after the container lid is attached to the mouth and neck. When the contents are cooled and a reduced pressure state is generated in the container, the contents are made to have a downwardly bulging concave shape, and an outer curl is formed at the lower end of the skirt wall of the inner lid. The inner diameter of the holding protrusion of the outer lid is larger than the maximum outer diameter of the portion of the inner lid other than the outer curl, A composite container lid characterized in that it is smaller than the outer diameter of the outer curl, and the inner lid is held in the space inside the outer lid by cooperation of the outer curl and the holding ridge. Provided.

[Action]

In the composite container lid of the present invention, when the inner lid and the outer lid are combined, the outer curl of the inner lid acts on the retaining ridges and the female thread of the outer lid, whereby the skirt wall of the outer lid and And / or the skirt wall of the inner lid is elastically deformed.
The outer curl has a form in which a sharp cutting edge is wound inward, and it is the smooth outer peripheral portion of the outer curl that acts on the retaining projection and the female thread of the outer lid. Therefore, the retaining ridges and the female thread of the outer lid are not damaged.

Even if rust occurs on the sharp cutting edge generated during press molding of the inner lid, the rust is not visible to the consumer because the sharp cutting edge is wrapped inside the outer curl.

The smooth outer peripheral part of the outer curl of the inner lid acts on the retaining ridges of the outer lid to hold the inner lid in the required position in the outer lid, so that the inner lid and the outer lid are relatively opposed to each other in the initial stage of the opening operation. The resistance against static rotation is relatively small, and only the outer lid is rotated in the initial stage of the opening operation, so that the rotational torque required during the opening operation can be set to a sufficiently small value.

After removing the container lid from the mouth and neck of the container,
When the inner lid is pushed downward through the opening formed in the central portion of the top wall of the outer lid, the outer curl of the inner lid acts on the retaining ridges and the female threads of the outer lid, and thereby the skirt of the outer lid. The wall and / or the skirt wall of the inner lid are elastically deformed. Therefore, similar to the case of inserting the inner lid into the outer lid,
The inner lid can be detached from the outer lid sufficiently easily to separate the two.

The outer curl formed on the inner lid increases the rigidity of the inner lid, and therefore, the warp of the inner lid is sufficiently prevented from occurring, and the occurrence of the poor sealing is surely avoided.

Furthermore, there is a pill fur proof hem at the lower end of the skirt wall of the outer lid, and the inner peripheral surface of the pill fur proof hem is locked to an annular locking jaw formed on the mouth and neck of the container. Due to the formation of the locking projections, the breaking line extending circumferentially through the skirt wall of the outer lid is broken as required when the container lid is removed from the neck, thus ensuring the pill Far-proof characteristics are also secured.

[Examples] Hereinafter, with reference to the accompanying drawings, preferred examples of a composite container lid configured according to the present invention will be described in detail.

Explaining with reference to FIG. 1 and FIG. 2, the composite container lid indicated by the whole number 2 is composed of a combination of an outer lid and an inner lid 6.

The outer lid 4, which can be formed by injection or compression molding from a suitable synthetic resin such as polypropylene or polyethylene, includes a top wall 8 and a cylindrical skirt wall 10 depending from the periphery of the top wall 8. A relatively large circular opening 12 is formed in the central portion of the top wall 8, and thus the top wall 8 has an annular shape. A rupture line 14 extending in the circumferential direction is formed in the skirt wall 10, and the skirt wall 10 is divided into a main portion 16 above the rupture line 14 and a pilfer proof hem 18 below the rupture line 14. Has been done. On the inner peripheral surface of the skirt wall 10, a plurality of ribs 20 are formed at intervals in the circumferential direction and extend in the axial direction. The break line 14 is formed by continuously cutting the skirt wall 10 from the outside thereof in the circumferential direction after injection or compression molding, leaving only the rib 20. Therefore,
The pilfer proof skirt portion 18 of the skirt wall 10 is connected to the main portion 16 only through the ribs 20 which form a so-called bridge portion. On the upper portion of the inner peripheral surface of the main portion 16 of the skirt wall 10, there is formed a retaining projection 22 that protrudes inward in the radial direction. In the illustrated embodiment, a plurality of (for example, six) holding ridges 22 are formed circumferentially spaced from each other and extending in the circumferential direction. If desired, annular retaining ridges can be formed that extend continuously in the circumferential direction. Main part 16 of the skirt wall 10
A female screw thread 24 is further formed on the inner peripheral surface of the above in a region below the holding projection 22. Main part 16 of the skirt wall 10
The outer peripheral surface of the knuckle is formed with knurls or irregularities 26 for preventing slippage of a finger applied thereto. A locking protrusion 28 is formed on the inner peripheral surface of the pilfer proof skirt 18 of the skirt wall 10. In the illustrated embodiment, a plurality of (for example, six) locking protrusions 28 are formed at a slight interval in the circumferential direction, and each of the locking protrusions 28 has a rectangular shape. It extends obliquely upward inward in the radial direction from the base end edge connected to the inner peripheral surface of the proof skirt 18. The thickness of each of the locking protrusions 28 is gradually increased from the base end edge toward the free end edge. Outer lid 4
From the standpoint of avoiding excessive undue punching at the time of die cutting in injection or compression molding, each of the locking projections 18 is provided with a pill-proof proof in injection or compression molding as shown by a two-dot chain line in FIG. The locking projections 28 are each formed into a shape that extends downward inward in the radial direction from the base end edge connected to the inner peripheral surface of the hem portion 18, and after the completion of injection or compression molding, each of the locking projections 28 is formed into the base end edge. It is expedient to be able to elastically swivel upwards about, and thus to extend radially inwardly from the proximal edge and incline upwards.

The inner lid 6, which is formed from a metal sheet such as a tin sheet or a chromic acid treated steel sheet, includes a circular top wall 30 and a cylindrical skirt wall 32 depending from the periphery of the top wall 30. An inclined step portion 34 is formed on the outer peripheral portion of the top surface wall 30 and is inclined downward inward at a relatively large inclination angle inward in the radial direction. And the central portion inside the inclined step portion 34
36 has a convex shape that bulges upward. Ceiling wall
An annular liner 38, which can be formed from a suitable relatively soft synthetic resin, is disposed in the annular region defined by the peripheral edge of 30 and the upper half of the skirt wall 32.
The liner 38 can be formed by a known method such as a spin lining method or an embossing method.

In the composite container lid 2 constructed according to the present invention, after or at the same time as the press forming of the inner lid 6, the lower end portion of the skirt wall 32 of the inner lid 6 is subjected to the well-known curling process itself to form the skirt wall. It is important to form the outer curl 40 at the lower end of 32. As clearly shown in FIG. 2, the formation of the outer curl 40 causes the sharp cutting edges 42 (FIG. 2) produced during press forming to be wound into the outer curl 40. The rust preventive coating is damaged at the sharp cutting edge 42, and therefore rust may occur at the sharp cutting edge 42, but the sharp cutting edge 42 is wound inside the outer curl 40 and is exposed to the outside. Therefore, even if rust occurs, it will not be exposed. As will be understood by referring to FIG. 2, the outer diameter d ₁ of the outer curl 40 in the inner lid 6 is equal to the holding ridge in the outer lid 4.
It is set to be larger than the inner diameter d _{2 of} 22. However, the maximum outer diameter of the portion of the inner lid 6 other than the outer curl 40 is set to be smaller than the inner diameter d ₂ of the holding projection 22 of the outer lid 4.

The composite container lid 2 is completed by combining the outer lid 4 and the inner lid 6 as shown in FIG. That is, by inserting the inner lid 6 into the outer lid 4 from below and inserting it into the space above the holding projection 22 of the outer lid 4,
The composite container lid 2 is completed. As described above, the outer diameter d ₁ of the outer curl 40 in the inner lid 6 is larger than the inner diameter d ₂ of the holding projection 22 in the outer lid 4. Also, in the illustrated embodiment, the outer diameter d of the outer curl 40 in the inner lid 6 is d.
₁ is larger than the inner diameter defined by the free end of the locking projection 28 on the outer lid 4 and the radially inner end of the female thread 24 on the outer lid 4. Therefore, when inserting the inner lid 6 to the required position in the outer lid 4, first, the outer curl 40 interferes with the locking projection 28, which causes the locking projection 28 to elastically move outward in the radial direction. And the outer curl 40 passes through the locking projection 28. Then
The outer curl 40 and the female thread 24 interfere with each other, whereby the skirt wall 10 of the outer lid 4 is elastically deformed radially outward and / or the skirt wall 32 of the inner lid 6 is elastically radially inward. And the outer curl 40 passes through the female thread 24. Thereafter, the outer curl 40 and the retaining projection 22 interfere with each other, whereby the skirt wall 10 of the outer lid 4 is elastically deformed radially outward and / or the skirt wall 32 of the inner lid 6 is radially inward. The outer curl 40 is elastically deformed to pass through the holding projection 22.
Thus, when the inner lid 6 is inserted into the outer lid 4 at a required position, the outer curl 40 and the holding ridge 22 cooperate with each other to lower the inner lid 6 from the lower side, as will be understood by referring to FIG. Is prevented, and the inner lid 6 is held at a required position in the outer lid 4. As described above, when the inner lid 6 is assembled with the outer lid 4, the outer curl 40 is sequentially engaged with the locking protrusion 28 and the female thread 24.
Although it interferes with the retaining ridges 22, the smooth outer peripheral portion of the outer curl 40 does not have the sharp cutting edge 42 but the locking protrusions 28,
Since it acts on the female thread 24 and the holding projection 22, when the inner lid 6 is assembled with the outer lid 4, the locking projection 28 and the female thread on the outer lid 4 are combined.
24 and retaining ridge 22 are not damaged.

The composite container lid 2 is applied to a container shown in FIG. 3 having a mouth / neck portion 44 of a form known per se. The mouth neck portion 44 of the container, which can be formed of glass or an appropriate synthetic resin, has a cylindrical shape with an open upper surface, and the outer peripheral surface thereof has a male thread 46 and an annular locking jaw portion located below the male thread 46. 48
And are formed.

When the mouth / neck portion 44 of the container is sealed by the composite container lid 2, the mouth / neck portion 44 is fitted with the composite container lid 2 and the composite container lid 2 is rotated clockwise as viewed from above in FIG. The female thread 24 is connected to the male thread 46 of the neck 44 until the state shown in FIG.
Screw it on. As a result, the locking projection 28 disposed on the inner peripheral surface of the pilfer proof skirt 18 of the outer lid 4 elastically bends radially outward and passes through the locking jaw 48 of the mouth / neck 44. After that, it is elastically restored and locked to the lower surface of the locking jaw 48. On the other hand, the liner 38 of the inner lid 6 is
Is tightly fitted to the upper end of the mouth, thus sealing the mouth / neck 44. If excessive warpage is generated in the top wall 30 and the skirt wall 32 of the inner lid 6, the liner can be sufficiently satisfactorily used in the entire circumferential direction.
Although 38 is not brought into close contact with the upper end of the mouth / neck portion 44, so-called poor sealing may occur. However, in the composite container lid 2 constructed according to the present invention, the outer lid curl 40 in the inner lid 6 causes the inner lid to be closed. The rigidity of 6 is increased, thus preventing excessive warpage of the inner lid 6 and thus preventing the occurrence of poor sealing. As is well known to those skilled in the art, when the contents are filled into a container in a heated state and the mouth / neck portion 44 is sealed by the composite container lid 2 before the contents are cooled,
A reduced pressure state is generated in the container by cooling after sealing. The central portion 36 of the top wall 30 of the inner lid 6 is protruded upward as shown by a two-dot chain line in FIG. 3 due to the above-mentioned depressurized state, and is moved downward as shown by a solid line in FIG. It is deformed into a bulging concave shape, and it is visually confirmed that such deformation has sealed the mouth and neck 44 sufficiently well.

In order to open the mouth / neck portion 44 of the container, a finger is put on the outer peripheral surface of the main portion 16 of the skirt wall 10 of the outer lid 4 and the outer lid 4 is rotated counterclockwise as viewed from above in FIG. .
At the initial stage of such rotation, the transmission of the rotational torque between the outer lid 4 and the inner lid 6 is relatively small because of the interference of the holding ridge 22 with the smooth outer peripheral portion of the outer curl 40 only. On the other hand, since the liner 38 of the inner lid 6 is in close contact with the mouth / neck portion 44, the rotation resistance of the inner lid 6 is relatively large. Therefore, only the outer lid 4 is rotated and the inner lid 6 is not rotated. When the outer lid 4 and the inner lid 6 cannot be relatively rotated relatively easily, and therefore, even when the outer lid 4 and the inner lid 6 are simultaneously rotated even in the initial stage of the rotation of the outer lid 4. Is a relatively large initial rotational torque required for the initial relative movement between the female thread 24 and the male thread 46, and a relatively large rotational torque required for separating the liner 38 of the inner lid 6 from the mouth / neck portion 44. However, it is necessary at the same time in the initial stage of rotation of the outer lid 4, and the torque required in the initial stage of rotation of the outer lid 4 becomes excessive.

When the outer lid 4 is rotated a little, the outer lid 4 is lifted over the required distance because the female thread 24 moves along the male thread 46. In this way, the inner lid 6 is also raised by the rising force applied from the holding projection 22 to the outer curl 40, and is also rotated together with the outer lid 4. As a result, when the liner 38 of the inner lid 6 separates from the mouth / neck portion 44, the sealing of the mouth / neck portion 44 is released, and the depressurized state in the container is released. That way,
The central portion 36 of the top wall 30 of the inner lid 6 is changed from the concave shape shown by the solid line in FIG.
It suddenly deforms into a convex shape shown by a two-dot chain line in the figure, and at this time, a sound is generated. Then, by such a sound, the consumer can audibly confirm that the mouth / neck portion 44 has been well sealed until then. On the other hand, the pilfer proof hem portion 18 of the outer lid 4 is prevented from rising because the locking protrusion 28 disposed on the inner peripheral surface thereof is locked to the locking jaw portion 48 of the mouth / neck portion 44. To be done. Therefore, when the main portion 16 of the skirt wall 10 is raised in accordance with the rotation of the outer lid 4, stress is generated in the rib 20 connecting the pilfer proof hem portion 18 to the main portion 16 and the rib 20 is broken. The Pilfer proof hem 18 is the main part 16
Separated from. Then, except for the pilfer-proof hem portion 18, the other portion of the outer lid 4 and the inner lid 6 are the mouth and neck portion 44.
Be separated from.

The outer lid 4 separated from the mouth / neck portion 44 of the container (more specifically,
Pilfer-proof hem 18 left in the mouth and neck 44
And the inner lid 6 can be separated from each other by pushing the inner lid 6 downward through an opening 12 formed in the top wall 8 of the outer lid 4. In this case, the inner lid 6
Outer curl 40 formed at the lower end of the skirt wall 32 of
Acts on the retaining projection 22, the female thread 24, and the locking projection 28 of the outer lid 4, so that the inner lid 6 can be easily detached from the outer lid 4.

〔The invention's effect〕

According to the composite container lid of the present invention, (1) there is no risk of damaging the retaining ridges and female threads of the outer lid when the inner lid and the outer lid are combined, and (2) sharp cutting of the inner lid. Even if rust occurs on the edge, such rust is not exposed, and (3) only the outer lid is rotated in the initial stage of the opening operation, and therefore the necessary rotation torque during the opening operation is sufficiently small, 4) After the container lid is removed from the mouth and neck of the container, the inner lid can be easily separated from the outer lid, and (5) the rigidity of the inner lid is increased, so that the occurrence of poor sealing occurs. It is sufficiently avoided, and in addition to (6) guaranteed characteristics, pill fur proof characteristics are secured.

[Brief description of drawings]

FIG. 1 is a side view of a preferred embodiment of a composite container lid constructed according to the present invention, showing a part in section with an outer lid and an inner lid separated. FIG. 2 is a partial sectional view showing a part of the composite container lid shown in FIG. 1. FIG. 3 is a partial sectional view showing a state in which the composite container lid shown in FIG. 1 is applied to the mouth and neck of the container. 2 …… Composite container lid 4 …… Outer lid 6 …… Inner lid 8 …… Outer lid top wall 10 …… Outer lid skirt wall 12 …… Outer lid top wall opening 14 …… Break line 16 …… Main part of skirt wall of outer lid 18 …… Piller proof hem of outer lid 22 …… Holding ridge 24 …… Female thread 28 …… Locking protrusion 30 …… Inner lid top wall 32 …… Inner lid Skirt wall 36 …… central part of the top wall of the inner lid 40 …… outer curl 42 …… sharp cutting edge 44 …… container neck 46 …… male thread 48 …… annular locking jaw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidehiko Omi No. 2-12 Mayoro, Hiratsuka, Kanagawa Japan, Hiratsuka Plant, Crown Cork Co., Ltd. (56) References: 56-24458 (JP, U) 57-20523 (JP, Y2)

Claims (1)

[Claims] 1. A mouth-neck portion of a container having a cylindrical mouth-neck portion, wherein an outer thread of the mouth-neck portion is formed with a male thread and an annular locking jaw portion located below the male thread. In addition, a composite container lid to be mounted after the contents are filled in a heated state and before the contents are cooled is composed of a synthetic resin outer lid and a metal inner lid. A ring-shaped top wall having an opening in the center and a cylindrical skirt wall hanging down from the peripheral edge of the top wall, the skirt wall having a fracture line extending in the circumferential direction, A main part above the breaking line and a pilfer proof hem below the breaking line are partitioned, and the male thread of the mouth-neck part is formed on the inner peripheral surface of the main part of the skirt wall. A female thread to be screwed into the female thread and a holding ridge located above the female thread are formed, On the inner peripheral surface of the pill fur proof hem, a locking projection that is locked to the annular locking jaw of the mouth and neck is formed, and the inner lid includes a circular top wall and a top wall of the top wall. A cylindrical skirt wall hanging down from the peripheral edge, and is housed in a space above the holding ridge in the outer lid, and a central portion of the top wall of the inner lid mounts the container lid on the mouth and neck. In the state before being a convex shape that bulges upward, when the contents filled in the container after the container lid is attached to the mouth and neck is cooled and a reduced pressure state is generated in the container, The inner cover has a concave shape bulging downward, and an outer winding curl is formed at the lower end of the skirt wall of the inner lid, and the inner diameter of the holding projection of the outer lid is the outer winding of the inner lid. Although it is larger than the maximum outer diameter of the portion other than the curl, but smaller than the outer diameter of the outer curl, Composite container closure in cooperation with the lifting protrusion, the inner lid is held in the space within the outer cover, characterized in that.