JP4683603B2 - Roll-on cap with sealing liner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a resin sealing liner is attached to the inner surface of the top plate portion of a metal shell, and roll-on molding when a cap is attached to the container mouth portion to match the male screw of the container mouth portion. The present invention relates to a roll-on cap in which a female thread is formed in a skirt portion of the cap, and more particularly, to a structure for ensuring sealing by a liner by deforming a shell at the time of roll-on molding in such a roll-on cap with a sealing liner.
[0002]
[Prior art]
This is a cap comprising a metal shell having a skirt portion suspended from a peripheral edge of a disk-shaped top plate portion in a substantially cylindrical shape, and a resin sealing liner attached to the inner surface of the top plate portion of the shell. When attaching the cap to the container mouth, the cylindrical part of the skirt of the cap (shell) against the male screw formed on the peripheral wall of the container mouth while pressing the cap over the container mouth from above The so-called roll-on cap, in which the cap is attached to the container mouth portion while forming the female screw on the skirt portion by pressing the side from the side with a roll, has been widely used in the past. Various structures have been conventionally proposed (for example, JP-A-48-89089, JP-A-53-65184, JP-A-2001-139053). See Japanese, etc.).
[0003]
[Problems to be solved by the invention]
By the way, in the roll-on cap with a sealing liner as described above, the cap that is put on the container mouth portion is viewed from above during the roll-on molding in which the cap is attached to the container mouth portion while forming the female screw on the cap skirt portion. While holding down, the corner part with a circular arc cross section that connects the top plate part and skirt part of the cap (shell) is deformed inward, and the liner is pressed against the container mouth part by this corner part to bring it into close contact Thereby, the sealing property of the cap and the container mouth part on the outer edge side of the upper end of the container mouth part is ensured.
[0004]
Regarding the deformation of the corner portion when roll-on molding such a cap, for example, as disclosed in JP-A-48-89089 and JP-A-2001-139053, the gap between the container mouth and the shell Since the shell is deformed so that the liner is compressed at the same time from the state in which the liner is sandwiched, a large force is required to deform the corner, and as a result, a large force is applied to the container mouth. As a result, the container may be deformed or damaged. In particular, when the container is a metal can, buckling occurs below the curl formed at the upper end of the container mouth. The potential is great.
[0005]
Further, for example, in the one disclosed in JP-A-53-65184, a liner is sandwiched between the container mouth and the shell with a space between the corner portion of the shell and the annular rib of the liner. Although the corner portion is deformed from a state where it is not, since the entire corner portion is greatly deformed, a relatively large force is required even by simply deforming the corner portion.
[0006]
Moreover, if the corner portion is deformed to a relatively small diameter so that the annular rib of the liner is strongly pressed against the container mouth portion, the corner portion of the shell is deformed while simultaneously strongly compressing the liner. Will require a large force to deform the corner portion, while if the shell corner portion is deformed to a relatively large diameter that does not compress the liner too much, it will be relatively small, just like deforming only the corner portion. Although force is sufficient, the pressing of the liner to the container mouth becomes weak and the sealing performance becomes insufficient.
[0007]
In the cap (shell and liner) disclosed in Japanese Patent Laid-Open No. 53-65184, the side wall on the outer edge side of the upper end of the mouth portion is a substantially vertical wall in the bag container as shown in the publication. In this case, the annular rib of the liner can be entirely pressed against the lower side wall of the upper edge of the container mouth by deforming the corner portion. For example, as shown in JP-A-2001-139053 If the curled part is formed at the upper end of the mouth part in such a can container, even if the corner part is deformed, the annular rib of the liner cannot be pressed at a height near the curl center of the curled part. When the top plate of the cap swells outward due to the internal pressure in the container, it is not possible to ensure sufficient sealing performance on the outer edge side of the upper end of the container mouth.
[0008]
An object of the present invention is to solve the above problems. Specifically, for a roll-on cap with a sealing liner, the corner portion of the shell of the cap can be deformed with a small force. It is an object to be able to effectively press the liner against the container mouth by deformation of the corner portion, and to ensure sufficient sealing on the upper edge of the container mouth. is there.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a metal shell in which a skirt portion is suspended in a substantially cylindrical shape from the periphery of the top plate portion, and a resin-made attachment attached to the inner surface side of the top plate portion. A roll-on cap consisting of a sealing liner and formed with a female screw on the skirt to match the male screw on the container mouth by roll-on molding when the cap is attached to the container mouth. Then, the corner portion connecting the top plate portion of the shell and the skirt portion is formed in two upper and lower stages with the annular concave portion as a boundary, and at the height near the lower end of the corner portion on the outer edge side of the upper end of the container mouth portion. A liner with an annular rib suspended is attached to the shell from the top plate portion of the shell to the vicinity of the concave portion of the corner portion, and at the lower step portion of the corner portion so as to be spaced from the annular rib. The By deforming the lower portion of the corner portion of the shell inward during roll-forming, and is characterized in that the annular rib of the liner is configured to be pressed against the container mouth part by the lower step portion.
[0010]
According to the above configuration, since only the lower step portion of the corner portion is deformed so as not to sandwich the annular rib of the liner, the corner portion can be deformed with a very small force. By deforming the lower step portion of the liner and pressing the annular rib of the liner against the container mouth portion, the annular rib of the liner can be brought into close contact with the container mouth portion at the height of the lower step portion of the corner portion. The sealing performance on the outer edge side of the upper end can be ensured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a roll-on cap with a sealing liner of the present invention will be described in detail based on the drawings. In addition, about the roll-on cap which concerns on one Embodiment of this invention, FIG. 1 shows the whole structure of a cap (before roll-on shaping | molding) and a container mouth part, FIG. 2 covered the cap before roll-on shaping | molding on the container mouth part. 3 is an enlarged view of the contact portion between the cap and the container mouth, and FIG. 3 is an enlarged view of the close contact portion between the cap and the container mouth when the cap is pressed from above in the state shown in FIG. 4 shows an enlarged view of the close contact portion between the cap and the container mouth portion in a state where the lower step portion of the cap corner portion is deformed by roll-on molding, and FIG. 5 shows deformation of the lower step portion of the corner portion of the cap at the time of roll-on molding. This shows the state when
[0012]
As shown in FIG. 1, the roll-on cap 1 according to this embodiment includes a metal shell 2 and a resin sealing liner 3, and the skirt portion 13 is formed in a substantially cylindrical shape from the periphery of the top plate portion 11. The liner 3 is attached to the inner surface side (lower surface side) of the top plate portion 11 with respect to the suspended shell 2, and the cap 1 (shell) is in a state before being attached to the mouth portion of the container body by roll-on molding. In the skirt 13 of 2), a pilfer proof band 15 is detachably formed at a skirt below the cylindrical portion 14 where a screw is to be formed.
[0013]
The material of the shell 2 and the liner 3 is not particularly limited. For the shell 2, for example, an aluminum alloy coated with an epoxy-phenol resin in which olefin resin powder is dispersed on the inner surface side. Conventionally known metal materials for caps such as plates are used, and for the liner 3, for example, a blend material of low density polyethylene and ethylene-propylene copolymer synthetic rubber, or polypropylene and styrene elastomer is used. A conventionally known resin material for a liner such as a blend material or a polyester-based elastomer is used, and is molded by a well-known embossing method or the like that is extruded in a molten state and embossed on the inner surface side of the top plate portion 11. ing.
[0014]
On the other hand, the container body 4 to which the cap 1 is attached is a metal can container having a wide mouth (for example, an outer diameter of 35 mm or more of the mouth part 40), and the mouth part (mouth and neck) of the container body 4 in this embodiment. Part) 40 is formed with an outer curl portion 41 in a ring shape along the upper end opening edge, and an inclined wall 42 extends downward and outward from the curled portion 41, and a lower portion of the inclined wall 42. A male screw 43 is formed, and an annular bulging portion 44 is formed below the male screw 43.
[0015]
The container body 4 to which the cap 1 is attached is not particularly limited, and may be an appropriate container such as a glass bottle or a resin bottle. The threaded can is integrally formed from, for example, an aluminum alloy plate or the like in which a protective film of a polyester film is thermally fused on both surfaces. Also, the outer diameter of the mouth is not limited to that of a wide mouth, and the mouth may have a narrow outer diameter of less than 35 mm.
[0016]
When the cap 1 is mounted on the mouth portion 40 of such a container body 4 by roll-on molding, a well-known metal cap winding device (capper) from the state in which the cap 1 is placed on the container mouth portion 40 from above. ), While applying top load to the top plate portion 11 of the cap 1, the skirt portion 13 of the cap 1 is matched with the male screw 43 of the container mouth portion 40 by each forming roll of the apparatus. The cylindrical portion 14 is deformed to form a female screw, and the lower end portion of the pill fur proof band 15 formed at the skirt portion of the skirt portion 13 is engaged with the lower end step portion of the annular bulging portion 44 of the container mouth portion 40. The cap 1 is attached so as to be screwed to the container mouth portion 40 by winding them together.
[0017]
By the way, the cap 1 attached to the container mouth portion 40 by roll-on molding as described above is in a state before the roll-on molding, and the corner portion 12 connecting the top plate portion 11 and the skirt portion 13 of the shell 2 is annular. The liner 3 attached to the inner surface side of the top plate portion 11 of the shell 2 is formed from the top plate portion 11 to the concave portion 12b of the corner portion 12. The outer annular rib 24 out of the two annular ribs formed in the peripheral portion of the liner 3 is in close contact with the shell 2 to the vicinity, and hangs down to a height near the lower end of the corner portion 12. There is a space between the lower stage 12c of the twelve.
[0018]
That is, as shown in FIG. 2, the liner 3 is formed by a disc-shaped thin flat portion 21 at the center portion and two peripheral portions arranged concentrically with an annular flat surface 23 interposed therebetween. Each of the annular ribs 22 and 24 has an appropriate thickness in the radial direction, and is simply covered with the cap 1 on the container opening 40 (not pressed from above). In the state in which the liner 3 is not elastically deformed, the outer wall of the inner annular rib 22 and the inner wall of the outer annular rib 24 are symmetrical with each other so as to be Mt. Fuji in the longitudinal section with the annular flat surface 23 as the top. The inner wall of the inner annular rib 22 and the outer wall of the outer annular rib 24 are both substantially vertical walls.
[0019]
Here, the annular ribs 22 and 24 of the liner 3 are positioned such that the outer annular rib 24 is located on the radially outer side and the inner annular rib 22 is located on the radially inner side when viewed from the curl center O of the curled portion 41. The curled portion 41 is surrounded from both upper sides. When the cap 1 is pressed against the container mouth 40 from above in such a state, the inner annular rib 22 is elastically deformed so as to open inward as shown in FIG. The outer annular rib 24 is elastically deformed so as to open outward. In this state, the outer annular rib 24 and the lower step portion 12c of the corner portion 12 remain spaced apart, and the outer annular rib 24 is curled. The outer surface of 41 cannot be securely adhered, and sufficient sealing performance cannot be ensured.
[0020]
On the other hand, a metal cap winding device (capper) is used, and the cap placed on the container mouth is pressed from above, and the molding thread of the device is aligned with the male screw of the container mouth. In the roll-on molding in which a female screw is formed in the skirt portion of the cap and the pilfer proof band at the skirt portion of the skirt portion is wound to be engaged with the annular bulging portion of the container mouth portion, 2 in FIG. By pressing the top plate portion 11 of the cap from above with the pressure pad 51 as shown by the dotted line, the bottom block portion 12c of the corner portion is deformed so as to be constricted inward by the pressure block 52. As shown in FIG. 4, the outer annular rib 24 is a curled portion of the container mouth portion 40 in a state where the outer annular rib 24 is pressed by the lower step portion 12c of the narrowed corner portion. It is brought into close contact with the 1.
[0021]
As a result, the outer annular rib 24 of the liner 3 is more closely attached to the curled portion 41 than the inner annular rib 22, and the curled portion 41 reaches a height near the height of the curled center O of the curled portion 41. Therefore, even when the top plate portion 11 of the cap bulges outward due to the internal pressure in the container, the tightness between the outer annular rib 24 and the curled portion 41 provides a sealing property. Sufficiently secured.
[0022]
According to the roll-on cap with the sealing liner of the present embodiment as described above, the outer annular rib 24 of the liner 3 is not sandwiched, and only the lower step portion 12c of the corner portion 12 is deformed, so that it is very small. The corner portion 12 can be deformed by force, and the lower step portion 12c of the corner portion 12 is deformed and the outer annular rib 24 is pressed against the curled portion 41. The outer annular rib 24 can be reliably brought into close contact with the outer surface of the curled portion 41 up to the height, and the top plate portion 11 of the cap 1 swells outward due to the internal pressure in the container, and the inner annular rib 23 of the liner 3. Even when the close contact between the curled portion 41 and the curled portion 41 is released, a sufficient sealing performance can be ensured by the close contact portion between the outer annular rib 24 and the curled portion 41.
[0023]
Further, since the corner portion 12 can be deformed with a small force, the load from above applied to the cap 1 at the time of roll-on molding can be reduced, and the load from above on the container mouth portion 40 can be reduced. The curl portion 41 is flattened and deformed by the container mouth portion 40 due to a load from above at the time of roll-on molding, or buckled by the inclined wall 42 below the curl portion 41. Thus, it is possible to reliably avoid a situation in which the cap 1 is not normally tightened.
[0024]
As mentioned above, although one embodiment of the roll-on cap with a sealing liner of the present invention has been described, the present invention is not limited to the embodiment as described above. For example, a pill fur proof band is provided at the skirt portion of the skirt portion. Not only the formed pill fur proof cap but also a cap without the pill fur proof function, and the cap shell skirt is formed with a non-slip knurled or vent vent for venting Also, the resin liner may have no inner annular rib or a flat central portion, and the container body to which the cap is attached is threaded. Not only cans but also other containers such as glass bottles and resin bottles, etc. But no.
[0025]
【The invention's effect】
According to the roll-on cap with a sealing liner of the present invention as described above, the corner portion of the cap shell can be deformed with a small force at the time of roll-on molding for mounting the cap on the container mouth, and from above The load can be reduced, the container mouth portion can be prevented from being damaged during roll-on molding, and the liner can be effectively pressed against the container mouth portion due to the deformation of the corner portion. The sealing performance on the outer edge side of the upper end of the mouth can be sufficiently secured.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view showing an entire structure of a cap (before roll-on molding) and a container mouth portion of an embodiment of a roll-on cap with a sealing liner of the present invention.
FIG. 2 is an enlarged sectional view showing a contact portion between a cap and a container mouth when a cap before roll-on molding is put on the container mouth.
FIG. 3 is an enlarged cross-sectional view showing a close contact portion between the cap and the container mouth when the cap before roll-on molding is put on the container mouth and pressed from above.
FIG. 4 is an enlarged cross-sectional view showing a close contact portion between a cap and a container mouth portion in a state where a lower step portion of a corner portion of the cap is deformed by roll-on molding.
FIG. 5 is an explanatory view showing a state when a lower step portion of a corner portion of a cap is deformed at the time of roll-on molding.
[Explanation of symbols]
1 Cap (roll-on cap)
2 Shell 3 Liner 11 Top plate portion 12 Corner portion 12a (corner portion) upper step portion 12b (corner portion) concave portion 12c (corner portion) lower step portion 13 Skirt portion 22 (liner) inner annular rib 23 (liner portion) ) Annular flat surface 24 Outer annular rib 40 (of the liner) Container port 41 Curl part O (of the container port part) Curl center of the curl part

Claims (3)

Consists of a metal shell with a skirt hanging down in a substantially cylindrical shape from the periphery of the top plate, and a resin sealing liner attached to the inner surface of the top plate, and a cap is attached to the container mouth In the roll-on cap in which the female screw is formed in the skirt part according to the male screw of the container mouth part by roll-on molding at the time, the corner part connecting the top plate part of the shell and the skirt part in the state before roll-on molding However, a liner formed by hanging an annular rib down to a height near the lower end of the corner portion on the outer edge side of the upper end of the container mouth is formed on the upper and lower sides of the annular concave portion. From the plate part to the vicinity of the concave part of the corner part, it is in close contact with the shell, and at the lower part of the corner part, it is attached so as to be spaced from the annular rib. By deforming the lower portion of the moiety inward sealing liner roll-on cap, characterized in that the annular rib of the liner is configured to be pressed against the container mouth part by the lower step portion. The resin liner has two annular ribs arranged concentrically with the annular flat surface interposed therebetween, and the outer wall of the inner annular rib and the inner wall of the outer annular rib are the annular flat surface therebetween. The outer annular rib is positioned on the upper edge of the container mouth, and the inner annular rib is the container mouth. 2. The roll-on cap with a sealing liner according to claim 1, wherein the roll-on cap with a sealing liner is located on the inner edge side of the upper end of the portion, and is spaced from the outer wall of the outer annular rib and the lower step portion of the corner portion. The container body is a metal screw can, and the lower step part of the corner part of the shell is deformed inward during roll-on molding with respect to the curl part having a substantially circular longitudinal section formed at the upper end of the container mouth part. Thus, the annular rib positioned on the outer edge side of the upper end of the container mouth portion is configured to be in close contact with the outer surface of the curl portion up to a height near the curl center of the curl portion. A roll-on cap with a sealing liner as described in 1.

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