JP2013082463A - Container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress rapid outflow of gas and outflow of an internal solution.SOLUTION: This container lid 1 includes a shell 6 and a liner 4, and attached to a container 40 having top neck part 42 formed with a curled part 50 in an upper end. When the container lid 1 is attached, lower surfaces of an annular thin part 36 and a boundary part 37 abut on an upper surface of an upper side curled part 52 to an upper end outer circumferential surface 54a of a vertical part 54, a lower end inner circumferential surface 38a of an annular outer side hanging piece 38 abuts on an outer circumferential surface of a lower side curled part 56, and an annular sealed space S is formed among the outer circumferential surface 54a of an outer circumferential surface part 54, a lower surface 34a of an annular thin part 34, and the inner circumferential surface 38a of the annular outer side hanging piece 38.

Description

The present invention relates to a container lid composed of a sheet metal shell and a synthetic resin liner for a sheet metal container having a mouth and neck portion having a curl portion formed thereon.

2. Description of the Related Art As a container for beverages such as coffee, a metal thin plate container having a mouth and neck part with a curl formed at the upper end is widely used in practical use. As a container lid for such a container, for example, as disclosed in Patent Document 1, a container lid composed of a thin metal plate shell and a synthetic resin liner has been proposed. The shell has a circular top wall and a cylindrical skirt wall depending from the periphery of the top wall, and a plurality of ventilation holes are formed in the upper part of the skirt wall at intervals in the circumferential direction. The liner has an annular seal that extends along the inner periphery of the top wall of the shell. In addition, the rigidity of the main body of the thin metal plate container is relatively small, and if the inside of the container is in a decompressed state, the main body may be locally depressed. When sealing the mouth and neck with the container lid attached, liquid nitrogen is dropped into the container and vaporized to bring the container into a positive pressure state. In this state, the container lid is fitted on the mouth and neck of the container, the shoulder region of the shell is deformed downward or radially inward, and the annular seal portion of the liner is brought into close contact with the upper surface or outer peripheral surface of the mouth and neck. It is attached to the mouth and neck by caulking.

The annular seal portion has an annular ring located on the inner peripheral side of the mouth and neck portion and an annular hanging piece located on the outer peripheral side of the mouth and neck portion. In a state where the container lid is mounted on the mouth and neck as required, the tip of the annular hanging piece is positioned radially outward from the outer peripheral surface of the curl of the mouth and neck.

JP 2007-131341 A

According to the above invention of Patent Document 1, even if the inner solution adhering to the inner surface of the liner is suddenly flowed accompanying the gas flow due to the release of the positive pressure in the container, it collides with the annular hanging piece of the liner. Then, it is guided downward and is prevented from flowing toward the vent hole, so that it is avoided that it is ejected from the vent hole to the outside and adheres to the consumer's hand. However, the inner solution guided downward by colliding with the annular hanging piece of the liner suddenly flows out toward the male thread formed on the mouth and neck of the container, and the mouth and neck part including the male thread of the container A relatively large amount may remain on the surface of the body or the surface of the body. As a result, there may be a case where the appearance is not preferable. Also, if you carry the product with the container lid attached to the mouth and neck again, it may adhere to the bag or clothes. It is desirable to suppress as much as possible.

The main object of the present invention is to prevent the internal solution adhering to the inner surface of the liner from being ejected from the vent hole to the outside accompanying the gas flow caused by the release of the positive pressure in the container. It is intended to provide a novel container lid that can prevent the outflow of the inner solution while preventing a rapid outflow of the mouth and neck of the mouth and neck toward the male thread.

According to the present invention, there is provided a container lid to be attached to a metal container having a mouth-and-neck portion having a curl portion formed at the upper end, which is composed of a thin metal shell and a synthetic resin liner, and the shell is circular. A ceiling skirt wall and a cylindrical skirt wall depending from the periphery of the top wall, and a plurality of air holes are formed in the upper portion of the skirt wall at intervals in the circumferential direction, and the liner is the shell An annular seal portion extending along the inner peripheral edge of the top wall, and the curl portion is formed at an upper end thereof, and an outer peripheral surface portion extending vertically downward from the upper curl portion; A lower curl portion extending inward from the lower end of the outer peripheral surface portion, and a container lid is fitted on the mouth neck portion of the container, and the shoulder region of the shell is deformed downward or radially inwardly. The annular seal portion of the liner is connected to the mouth and neck In the container lid attached to the mouth / neck portion by being brought into close contact with the upper surface or the outer peripheral surface of the curl portion, the annular seal portion includes an annular inner hanging portion located on the inner peripheral side of the mouth / neck portion, An annular thick part located on the outer peripheral side of the mouth and neck, an annular thin part located between the annular thick part and the annular inner hanging part, and a thickness extending from the annular thin part to the annular thick part An increasing boundary portion, and an annular outer hanging piece that hangs linearly with a certain radial thickness from the outer peripheral edge of the annular thick portion, and a lower end and an outer circumferential surface of the inner circumferential surface of the annular outer hanging piece The surface between the lower end of the annular thin wall portion is formed from an inclined surface extending downward from the inner peripheral surface side toward the outer peripheral surface side, and the container lid is mounted on the mouth and neck portion as required. The lower surface of each of the boundary portions is an upper surface or a front surface of the upper curl portion. The outer peripheral surface abuts on the outer peripheral surface of the upper peripheral portion, and the inner peripheral surface of the lower end portion of the annular outer hanging piece abuts on the outer peripheral surface of the lower curl portion, and the outer peripheral surface of the outer peripheral surface portion and the annular thick portion A container lid is provided, wherein an annular sealed space is formed between the lower surface and the inner peripheral surface of the annular outer hanging piece.
After removing the container lid from the mouth and neck, when the container lid is threadedly engaged with the mouth and neck and rotated in the closing direction in order to attach the container lid to the mouth and neck again, the liner is first The inclined surface of the annular outer hanging piece abuts on the outer peripheral surface of the lower end portion of the upper curled portion of the curled portion, and the lower end of the outer circumferential surface of the annular outer hanging piece is positioned directly above or outside the outer peripheral surface portion. Is preferable.

According to the container lid of the present invention, the internal solution adhering to the inner surface of the liner is prevented from being ejected from the vent hole to the outside accompanying the gas flow due to the release of the positive pressure in the container, and the gas It is possible to prevent a rapid outflow of the mouth and neck of the container toward the male thread and to suppress the outflow of the internal solution. In addition, since it does not have a complicated structure despite the provision of an annular outer hanging piece, it is easy to mold and prevents positive outflow of gas and suppresses outflow of the inner solution. It is easy to adjust the pressure.

It is a front view (before mounting to a container mouth neck part) which shows one side half of an embodiment of a container lid constituted according to the present invention in section. It is an expanded sectional view (before mounting to a container mouth neck part) which shows the boundary part periphery of the circular top wall of a container lid shown in Drawing 1, and a skirt part. The container lid shown in FIG. 1 is put on the container mouth and neck, and is molded to be sealed, and is a front view showing the container lid and one half of the container in cross section (the container mouth and neck of the container lid) After installation). FIG. 4 is an enlarged cross-sectional view (after the container lid is attached to the container mouth / neck portion) showing the periphery (including the opening of the mouth / neck portion of the container) of the circular top surface wall and the skirt portion of the container lid shown in FIG. 3. The container lid shown in FIG. 3 is rotated in the opening direction so that the tamper evidence skirt is separated and the seal between the annular seal portion and the upper end surface of the curl portion is released, and the inner surface of the lower end portion of the annular outer hanging piece is the curled portion It is the state which contact | abutted to the outer surface of the vertical part of this, Comprising: It is a front view which shows the container lid and the half one side of a container in a cross section. FIG. 6 is an enlarged cross-sectional view showing the periphery of the boundary between the circular top surface wall and the skirt portion (including the opening of the mouth and neck of the container) of the container lid shown in FIG. 5. FIG. 4 is a front view showing the container lid and one half of the container in cross-section in a state in which the container lid is detached from the mouth-neck portion and then brought close to the mouth-neck portion in order to attach the container lid to the mouth-neck portion again. . FIG. 8 is an enlarged cross-sectional view showing the periphery of the boundary between the circular top surface wall and the skirt portion of the container lid shown in FIG. 7 (including the opening of the mouth and neck of the container). In the enlarged cross-sectional view (before mounting on the container mouth neck) showing the periphery of the boundary between the circular top wall and the skirt of the container lid shown in FIG. FIG. FIG. 5 is an enlarged cross-sectional view in which a dimension line and a symbol are written in a curled portion of a container mouth neck portion in the enlarged cross-sectional view shown in FIG. 4. It is a table | surface which shows the experimental result which investigated the example of the container lid comprised according to this invention, and the example of the conventional container lid, and investigated the amount of liquid ejection (g) and the number of biting at the time of reseal.

Embodiments of a container lid configured according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a container lid according to the present invention, and FIG. 2 is an enlarged cross-sectional view of an annular seal portion of the liner of FIG.

A container lid 1 shown in FIG. 1 includes a shell 2 made of a thin metal plate and a liner 4 made of a synthetic resin. The metal thin plate shell 2 is formed of an aluminum-based alloy thin plate or the like, and has a circular top wall 6 and a substantially cylindrical skirt wall 8 depending from the periphery of the circular top wall 6. The circular top wall 6 of the shell 2 extends substantially horizontally as a whole, and a weakening line 10 extending in the circumferential direction is formed at the bottom of the skirt wall 8 of the shell 2. The skirt wall 8 is provided with a main portion 12 above the weakening line 10 and with a tamper evidence skirt portion 14 below the main portion 12.

The circumferential weakening line 10 is formed at a lower portion of the annular bulging portion 16, and is formed from a slit 18 extending in the circumferential direction with an interval in the circumferential direction and a bridging portion 20 existing between the slits 18. It is configured. The length of the bridging portion 20 is sufficiently shorter than the length of the slit 18 to facilitate breakage. A circular groove portion 22 extending in the circumferential direction with a space from the top wall 6 is formed at the upper portion of the skirt wall 8, and so-called irregularities exist alternately in the circumferential direction in the region above the circular groove portion 22. A knurl 24 is formed. The upper end edge of the recess of the knurl 24 is cut and the upper end edge is displaced radially inward, whereby a relatively small slit 26 is formed in the upper end portion of the skirt wall 8 at intervals in the circumferential direction. Yes.

The liner 4 has a disk shape as a whole, and is disposed on the inner surface of the circular top wall 6 of the shell 2. The material of the liner 4 is a synthetic resin. In the illustrated embodiment, as will be described later, the liner 4 is made of a synthetic resin containing polypropylene. As shown in FIG. 2, a thin central region 28 is formed in the central portion of the liner 4, and an annular seal portion 30 is formed in the peripheral region so as to surround the central region 28. The annular seal portion 30 includes an annular inner hanging portion 32 positioned on the inner peripheral side of the mouth / neck portion 42 of the container 40 described later, an annular thick portion 34 positioned on the outer peripheral side of the mouth / neck portion 42, and an annular thick portion. 34 from the annular thin wall portion 36, a boundary portion 37 whose thickness increases from the annular thin portion 36 to the annular thick portion 34, and constant from the outer peripheral edge of the annular thick portion 34. And an annular outer hanging piece 38 that hangs linearly with a thickness in the radial direction. The surface between the lower end of the inner peripheral surface 38a of the annular outer hanging piece 38 and the lower end of the outer peripheral surface 38b is formed from an inclined surface 39 extending downward from the inner peripheral surface 38a side toward the outer peripheral surface 38b side.

The annular inner drooping portion 32 includes an inner peripheral surface 32a that hangs linearly from the lower surface of the central region 28, an outer peripheral surface 32b that is slightly inwardly inclined and extends downward, and an inner peripheral surface 32a side from the lower end of the outer peripheral surface 32b. A curved lower surface 32c extending in a fan shape toward the inner side, and a lower end surface 32d extending horizontally from the end portion on the inner peripheral surface 32a side of the curved lower surface 32c toward the lower end of the inner peripheral surface 32a. In the present embodiment, the protruding amount of the annular outer hanging piece 38 is smaller than that of the annular inner hanging portion 32. Further, the annular thin portion 36 has substantially the same thickness as the central region 28 of the liner 4. The lower surface 37 a of the boundary portion 37 forms a gently curved surface from the lower surface 36 a of the annular thin portion 36 to the lower surface 34 a of the annular thick portion 34. The outer peripheral surface 34b of the annular thick portion 34 and the outer surface 38b of the annular outer hanging piece 38 are positioned on the outer peripheral surface having the same diameter and form the same cylindrical outer peripheral surface. A non-adhesive region X is formed between the outer peripheral edge of the liner 4 and the inner peripheral surface of the circular top surface wall 6 of the shell 2 at the outer peripheral edge where the annular seal portion 30 exists. The central region 28 excluding the non-bonded region X is bonded to the inner surface of the top wall 6.

FIG. 3 shows the mouth / neck part 42 of the container 40 to which the container lid 1 is mounted together with the container lid 1 described above. The container 40 can be formed from an aluminum-based alloy sheet, a chromic acid treated steel sheet, or a tin sheet. The mouth and neck portion 42 of the container 40 has a substantially cylindrical shape as a whole, and a male thread 44 is formed at the center in the axial direction, and a locking jaw 46 having an annular bulging shape is formed below the male thread 44. Is formed. The upper part of the mouth-and-neck part 42 has a truncated cone-shaped conical surface 48 whose diameter gradually decreases upward, and a curled part 50 is formed at the upper end of the mouth-and-neck part 42. Referring also to FIG. 4, the curled portion 50 includes an upper curled portion 52 formed by curving the upper end side of the mouth and neck portion 42 outward in the radial direction of the mouth and neck portion 42, and the upper curled portion. A vertical portion 54 that is an outer peripheral surface portion extending downward in the vertical direction and a lower curl portion 56 that is formed by curving from the lower end of the vertical portion 54 inward in the radial direction. In the embodiment, the lower curl portion 56 has a semi-circular shape that is completely inverted, but may be an arc shape that is partially inverted.

An example of an attachment procedure for attaching the container lid 1 to the mouth / neck part 42 of the container 40 to seal the mouth / neck part 42 will be described as follows. After the container 40 is filled with the liquid beverage, the container lid 1 is fitted to the mouth / neck part 42. When the mouth / neck part 42 is sealed, liquid nitrogen is introduced into the container 40 and the upper end of the container 40 is placed. The air in the space existing in the container is removed from the inside of the container 40, and then the container lid 1 is fitted on the mouth and neck part 42. In this fitted state, the annular thin portion 36 and the boundary portion 37 in the annular groove formed between the annular inner hanging portion 32 and the annular outer hanging piece 38 in the annular seal portion 30 of the liner 4 are the mouth and neck portions. The upper part of the outer circumferential surface 32 b of the annular inner hanging part 32 is in contact with the inner circumferential surface of the upper end part of the mouth-and-neck part 42. Thus, the annular inner hanging portion 32 enters the mouth and neck portion 42, the upper outer circumferential surface 32 b of the annular inner hanging portion 32 is brought into pressure contact with the inner circumferential surface of the upper curled portion 52, and the outer circumferential surface 32 b of the annular inner hanging portion 32. And the inner circumferential surface of the upper curled part 52 are temporarily sealed. As a result, liquid nitrogen is vaporized, thereby increasing the internal pressure of the container 40 and suppressing deformation of the container 40.

Next, a pressing tool (not shown) is pressed against the circular top wall 6 of the shell 2, and a pressing portion (not shown) having a shoulder portion facing downward is provided at the shoulder at the boundary between the circular top wall 6 and the skirt wall 8. Acting on the region, the boundary region is immersed downward and radially inward. If it does in this way, the annular seal part 30 of the liner 4 will be contact | adhered to the upper surface thru | or outer peripheral surface of the curl part 50 of the mouth neck part 42, and the opening of the mouth neck part 42 will be sealed. Details of this sealing will be described later. After the sealing process of the opening of the mouth and neck portion 42 by the liner 4 is completed, a screw forming tool (not shown) is further used for the skirt wall 8 of the shell 2, and the male screw of the mouth and neck portion 42 is directed downward of the skirt wall 8. A female thread 60 is formed along the line 44. Further, the lower portion of the tamper evidence skirt 14 of the skirt wall 8 is forced radially inward by a locking tool (not shown) to lock the skirt 14 to the locking jaw 46 of the mouth and neck 42. .

As described above, in a state where the container lid 1 is mounted on the mouth and neck part 42 of the container 40 as required (FIGS. 3 and 4), each of the annular thin part 36 and the boundary part 37 in the annular seal part 30 of the liner 4 is provided. The lower surfaces 36a and 37a abut on the upper surface of the upper curl portion 52 or the outer peripheral surface of the upper end portion of the vertical portion 54. Further, the inner peripheral surface 38 a of the lower end portion of the annular outer hanging piece 38 abuts on the outer peripheral surface of the lower curled portion 56. Furthermore, an annular sealed space S is formed between the outer peripheral surface 54 a of the vertical portion 54, the lower surface 34 a of the annular thick portion 34, and the inner peripheral surface 38 a of the annular outer hanging piece 38. The position of the lowermost end (the lower end of the outer peripheral surface 38 b) of the annular outer drooping piece 38 is positioned at a position substantially equal to or slightly below the height of the slit 26 of the container lid 1.

Next, the operation of the container lid 1 will be described. As shown in FIGS. 3 and 4, in a state where the container lid 1 is sealed in the mouth and neck portion 42 of the container 40, that is, in a state where the container lid 1 is attached to the mouth and neck portion 42 as required, the annular shape of the liner 4 The lower surface 36a and 37a of the outer peripheral surface 32b of the annular inner hanging portion 32 in the seal portion 30 and the lower surface 36a and 37a of the annular thin portion 36 and the boundary portion 37 are the inner peripheral surface, upper surface and vertical portion 54 of the upper end curl portion 52. Since it is brought into contact with the outer peripheral surface of the upper end portion and sealed firmly, the positive pressure and the content liquid in the container 40 do not leak to the outside.

When the mouth / neck portion 42 of the container 40 is opened for the first time to consume the contents, the container lid 1 is rotated in the opening direction. Thereby, the container lid 1 is raised with rotation by the cooperation of the male thread 44 of the mouth-and-neck part 42 and the female thread 60 of the container lid 1. Since the tamper-evidence skirt portion 14 of the container lid 1 is locked to the locking jaw portion 46 of the mouth-and-neck portion 42, the tamper-evident skirt portion 14 is prevented from rising and corresponds to the bridging portion 20 of the circumferential weakening line 10 of the shell 2. Stress is generated, the circumferential weakening line 10 is broken, and the tamper evidence skirt 14 is separated from the main portion 12 of the skirt wall 8. After the tamper evidence skirt 14 is separated from the main portion 12, the tamper evidence skirt 14 is left in the mouth neck portion 42, the container lid 1 is detached from the mouth neck portion 42, and the mouth neck portion 42 is Opened.

For example, when the inside of the container 40 is in a positive pressure state by forcibly filling the container 40 with contents such as coffee, that is, liquid nitrogen and then filling with liquid nitrogen, the sealing of the mouth and neck portion 42 is performed. Is released (when a seal break is performed), the gas in the positive pressure state in the container 40 is caused by the slit 26 formed in the skirt wall 8 of the shell 2 and the mouth and neck 42 of the container 40. There is a tendency to flow out rapidly toward the male thread 44. In the state in which the content liquid is attached to the inner surface of the liner 4, the curled portion 50 of the mouth-and-neck portion 42, etc., there is a possibility that the liquid suddenly flows out accompanying the gas. When the liquid suddenly flows out toward the male thread 44 of the slit 26 and the mouth-and-neck part 42 of the container 40 together with the gas, the liquid may adhere to a consumer's fingertip or clothes. Further, the inner solution may suddenly flow out toward the male thread 44 of the mouth / neck portion 42 of the container 40.

In the above embodiment of the container lid 1 according to the present invention, when the container lid 1 is first rotated, for example, 30 ° to 100 ° in the opening direction from the mounted state shown in FIGS. The upper end portion of the outer peripheral surface 32b of the annular inner hanging portion 32 in the portion 30, the lower surfaces 36a and 37a of the annular thin portion 36 and the boundary portion 37, the inner peripheral surface of the upper end portion of the upper curl portion 52, the upper surface or the upper end of the vertical portion 54 The seal with the outer peripheral surface of the part is released (a seal break is performed). At that moment, since the positive pressure in the container 40 is released, the gas is suddenly exhausted from the sealing release part, but before the gas is exhausted to the outside of the annular seal part 30, The gas is exhausted into the annular sealed space S. At the lower end position of the sealed space portion S, the lower end inner peripheral surface 38a of the annular outer drooping piece 38 is in contact with the outer peripheral surface of the lower curl portion 56 or the outer peripheral surface 54a of the vertical surface 54, and the annular outer drooping piece 38 is in contact. Due to the elastic deformation, the contact pressure (seal pressure) is higher than that during mounting. As a result, the gas exhausted into the sealed space S first increases the pressure in the sealed space S. Then, when the pressure rises until the seal of the lower end inner peripheral surface 38a of the annular outer drooping piece 38 is released against the outer peripheral surface 54a of the vertical surface 54, it is vertical to the lower end inner peripheral surface 38a of the annular outer drooping piece 38 for the first time. The air is exhausted from between the outer peripheral surface 54a of the surface 54 and the outside toward the conical surface 48 of the mouth-and-neck portion 42. By further rotation of the container lid 1 in the opening direction, the annular outer hanging piece 38 is raised, and the lower end portion of the inner circumferential surface 38a of the annular outer hanging piece 38 is raised while being pressed against the outer circumferential surface 54a of the vertical portion 54. It is moved (see FIGS. 5 and 6). During this time, the gas in the container 40 whose pressure has gradually decreased is gradually exhausted from the contact portion between the lower end portion of the inner peripheral surface 38a of the annular outer hanging piece 38 and the outer peripheral surface 54a of the vertical portion 54.

As is clear from the above description, the container lid 1 is first rotated in the opening direction from the mounted state shown in FIGS. 3 and 4, and a seal break is performed between the annular seal portion 30 and the curled portion 50. However, since the positive pressure in the container 40 is gradually exhausted without being suddenly exhausted to the outside of the annular seal portion 30, the positive pressure in the container 40 is gradually reduced. As a result, accompanying the gas flow due to the release of the positive pressure in the container 40, the inner solution adhering to the inner surface of the liner 4 is also gradually discharged according to the gradually reduced positive pressure without suddenly flowing out. Therefore, the outflow amount is suppressed and the outflow of the inner solution is also suppressed. Further, at the time of a seal break with the highest positive pressure in the container 40, the inner solution flows out toward the conical surface 48 of the mouth-and-neck portion 42. Therefore, the air holes formed by opening the slit 26 at the time of molding. From the outside to the outside, and the outflow of the inner solution toward the male thread 44 of the mouth and neck portion 42 of the container 40 can be suppressed.

In the container lid 1, the annular seal portion 30 includes an annular inner hanging portion 32, an annular thick portion 34, an annular thin portion 36, a boundary portion 37, and an annular outer hanging piece 38, and has a complicated configuration. Therefore, the liner 4 can be easily molded, and the gas can be prevented from abruptly flowing out toward the male thread 44 of the mouth / neck portion 42 of the container 40 and the outflow of the internal solution can be suppressed. Make it possible to do. In addition, it is easy to adjust the positive pressure to prevent the gas from abruptly flowing out and suppress the outflow of the inner solution. Specifically, for example, the radial thickness and hardness of the annular outer hanging piece 38, the volume of the sealed space S, and the like can be easily adjusted.

Referring to FIGS. 7 and 8, after the container lid 1 is detached from the mouth / neck portion 42 of the container 40, the threaded engagement with the mouth / neck portion 42 in order to attach the container lid 1 to the mouth / neck portion 42 again. Then, resealing is performed by rotating in the closing direction (by engaging the female thread 60 of the container lid 1 with the male thread 44 of the mouth-and-neck portion 42). By such rotation of the container lid 1 in the closing direction, the liner 4 firstly has the inclined surface 39 of the annular outer hanging piece 38 of the annular seal portion 30 against the outer peripheral surface of the lower end portion of the upper curled portion 52 of the curled portion 50. The lower end of the outer peripheral surface 38b of the annular outer drooping piece 38 is positioned just above or slightly outward of the vertical portion 54. From this state, when the container lid 1 is further rotated in the closing direction, the inclined surface 39 of the annular outer drooping piece 38 of the upper curl portion 52 of the curled portion 50 is caused by the relative lowering of the container lid 1 with respect to the mouth and neck portion 42. The annular outer hanging piece 38 rotates to the outer circumferential surface 54a of the vertical portion 54 while being gradually elastically deformed so as to be smoothly guided toward the lower tangential outer side with respect to the lower outer circumferential surface. It is moved while. As a result, it is possible to prevent a problem that the annular outer hanging piece 38 bites into the upper surface of the upper curled portion 52 of the curled portion 50. In order to suitably prevent this biting, the material hardness of the liner 4, the thickness of the annular outer hanging piece 38, the protruding length, etc. are appropriately set as will be described later.

Next, for the example of the container lid 1 of the present invention and an example of a conventional container lid, the table shown in FIG. 11 shows the experimental results of examining the amount of liquid spray (g) and the number of occurrences of biting during resealing. The description will be given with reference. The structure of the container lid 1 is as described with reference to FIGS. 1 to 4, and the dimensions (see FIGS. 9 and 10) of the main part of the annular seal portion 30 of the liner 4 are as follows ( Dimensions before molding).
Thickness T1: 0.575 mm of the annular thin portion 36
Difference thickness T2 between the annular thin portion 36 and the annular thick portion 34: 0.4 mm
(Thus, the thickness of the annular thick part 34 is 0.975 mm)
Projection length L1: 1.115 mm of the inner peripheral surface 38a of the annular outer hanging piece 38
(Projection length from the lower surface 34a of the annular thick part 34)
Projection length L2 of the outer peripheral surface 38b of the annular outer hanging piece 38: 1.7 mm
(Projection length from the lower surface 36a of the annular thin portion 36)
Radial thickness T3 of the annular outer hanging piece 38: 0.4 mm:
Inclination angle θ of the inclined surface 39 of the annular outer hanging piece 38: 30 °
(Inclination angle θ with respect to the horizontal plane)
Total length L3 in the vertical direction of the curled portion 50: 2.3 mm (usually used in a range of 2.1 to 2.5 mm)
(Length between the uppermost and lowermost surfaces of the upper and lower curled parts 52 and 56)
An example of a conventional container lid used in the experiment includes a liner having a shape in which the outer side of the annular inner hanging portion 32 of the liner 4 shown in FIG. 1 is configured only by the annular thin portion 36 and the annular thick portion 34. Container lid.

As shown in the table of FIG. 11, in one example of a conventional container lid, a liner having a hardness D57 in Shore D hardness (JISK6253) was used. In the embodiment of the container lid 1 of the present invention, three types of liners having hardness D52, D55 and D57 were used. The blending ratio (weight percent) of the material constituting the liner having the hardness D57 (conventional and the present invention) is 62.5% polypropylene, 37.5% styrenic elastomer, and the liner having the hardness D55 is 56.0% polypropylene. The liner having 44.0% styrene elastomer and hardness D52 is 50.0% polypropylene and 50.0% styrene elastomer. Each of the styrene elastomers contains SEBS (styrene ethylene butadiene styrene copolymer) and liquid paraffin in a ratio of 6: 4.

The number of occurrences of biting at the time of resealing is the number of occurrences of biting as a result of performing the sealing operation by opening 60 filled products. No biting occurred in the conventional container lid provided with the liner having the hardness D57 and the container lid of the present invention provided with the liner having the hardness D55 and the hardness D57. However, in the container lid of the present invention provided with the liner having the hardness D52, two were generated. This is a result of various methods such as performing the method of closing the container lid more violently than usual, and even from the low frequency, it is not particularly problematic in practical use.

The liquid ejection amount (g) [gram] at the time of opening shows the result of 10 times for each container by the measuring method described later, and MAX indicates the maximum value. Whereas the MAX of the container with the conventional container lid is 2.86 g, the MAX of the container with the container lid of the present invention including the liner having the hardness D55 is 1.65 g, which is half of the conventional MAX. The amount was as follows. On the other hand, the MAX of the container provided with the container lid of the present invention including the liner having the hardness D57 is 2.59 g, which is still smaller than the conventional MAX. Moreover, about the container provided with the container lid of this invention containing the liner which has hardness D52, since it confirmed the experimental result of the number of biting at the time of resealing, it did not measure.

From the above experimental results, the Shore D hardness Z of the liner of the container lid of the present invention is
D53 ≦ Z ≦ D56
It can be said that the range is preferable.
In addition, in order to suppress liquid jetting at the time of opening and to prevent biting,
L1 = 1.115mm ± 0.4mm
T3 = 0.4 mm ± 0.2 mm, more preferably T3 = 0.4 mm ± 0.15 mm,
θ = 30 ° ± 10 °
It is preferable that
Furthermore, considering the sealing properties,
T1 = 0.575 mm ± 0.15 mm,
T2 = 0.4 mm ± 0.15 mm,
It is preferable that

The liquid ejection amount (g) [gram] was measured by the following method. That is, in each unopened container weighed in advance, after repeating the vibration of 2 times / second in the vertical direction 5 times, the container is erected, and after 3 seconds, it is tilted 30 ° from the erected state, Open the container lid to 120 ° at once. The weight is measured in a state where the liquid adhering to the mouth-neck portion and the trunk portion of the container by squirting or dripping is wiped off. The container lid is removed from the container, and the weight of the container lid is wiped off from the side of the container lid and the liquid attached to the container. From the measurement result, the amount of liquid ejected outside the container lid is calculated.

1: Container lid 2: Metal thin plate shell 4: Synthetic resin liner 6: Circular top wall 8: Cylindrical skirt wall 26: Slit 30: Annular seal part 32: Annular inner hanging part 34: Annular thick part 36: Annular Thin part 37: Boundary part 38: Annular outer hanging piece 39: Inclined surface 40: Container 42: Mouth and neck part 50: Curl part 52: Upper curl part 54: Vertical part (outer peripheral part)
56: Lower curl portion S: Annular sealed space

Claims (2)

A container lid to be attached to a metal container having a mouth and neck portion formed of a thin metal shell and a synthetic resin liner and having a curl portion formed at the upper end thereof, wherein the shell is a circular top wall and the top wall A cylindrical skirt wall depending from the periphery of the skirt wall, and a plurality of air holes are formed in the upper part of the skirt wall at intervals in the circumferential direction, and the liner is an inner surface of the top wall of the shell The curl portion includes an upper curl portion formed at an upper end, an outer peripheral surface portion extending vertically downward from the upper curl portion, and a lower end of the outer peripheral surface portion. An annular curling portion of the liner, which is formed by an inwardly extending lower curl portion, and a container lid is fitted on the mouth and neck portion of the container, and the shoulder region of the shell is deformed downward or radially inward. The curl of the mouth and neck In the container closure to be attached to the outlet neck by close contact with the top surface to the outer peripheral surface,
The annular seal portion includes an annular inner hanging portion located on the inner peripheral side of the mouth and neck portion, an annular thick portion located on the outer peripheral side of the mouth and neck portion, the annular thick portion and the annular inner hanging portion. An annular thin portion located between the annular thin portion, a boundary portion where the thickness increases from the annular thin portion to the annular thick portion, and a linear thickness depending on the outer peripheral edge of the annular thick portion. A surface between the lower end of the inner peripheral surface of the annular outer drooping piece and the lower end of the outer peripheral surface is an inclined surface extending downward from the inner peripheral surface side toward the outer peripheral surface side. Formed,
In a state where the container lid is mounted on the mouth-and-neck portion as required, the lower surface of each of the annular thin portion and the boundary portion abuts on the upper surface of the upper curl portion or the outer peripheral surface of the outer peripheral surface portion, and The inner peripheral surface of the lower end portion of the annular outer hanging piece abuts on the outer circumferential surface of the lower curl portion, and the outer circumferential surface of the outer circumferential surface portion, the lower surface of the annular thick portion, and the inner circumferential surface of the annular outer hanging piece. An annular sealed space is formed between them,
A container lid characterized by that. After removing the container lid from the mouth and neck, when the container lid is threadedly engaged with the mouth and neck and rotated in the closing direction in order to attach the container lid to the mouth and neck again, the liner is first The inclined surface of the annular outer hanging piece abuts on the outer peripheral surface of the lower end portion of the upper curled portion of the curled portion, and the lower end of the outer circumferential surface of the annular outer hanging piece is positioned directly above or outside the outer peripheral surface portion. The container lid according to claim 1.

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