JP2019112076A - Cap with liner and metal bottle with the cap - Google Patents

Abstract

To provide a bottle cap which keeps an excellent sealing capacity even when internal pressure of a metal bottle is applied.SOLUTION: A cap with a liner is attached to a curled part of a metal bottle having the curled part at an opening edge. The cap with the liner comprises: a cap body including a top surface part and a cylindrical part substantially vertically extending down from a peripheral edge of the top surface plate; and a liner arranged on an internal surface of the top surface part, and laminated with a sliding layer contacting the inner surface of the top surface part and a sealing layer contacting the curled part. A projection part is arranged in a circumferential direction on an outer periphery of the sealing layer of the liner, for contacting closely with the lower side of outer periphery of the curled part when the cap is attached to the curled part and the sealing layer of the liner is pushed against the top of the curled part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cap with a liner and a cap with a cap attached to the opening of a bottle can for beverages and the like and sealing the inside.

A container in which a metal cap is attached to the opening of a bottle-shaped can (bottle can) made of steel, aluminum alloy or the like as a container filled with contents such as beverages, and the inside is sealed by a liner on the inner surface of the cap It has been known.
For example, in the bottle can (bottle type can) disclosed in Patent Document 1, the curled portion of the outer winding is formed so as to be rolled up while folding the cut end portion of the opening to the outside more than twice. The cap is attached to In this case, the top of the curled portion is in close contact with the liner (seal portion).

On the other hand, in the case of the bottle can (can body) disclosed in Patent Document 2, the outer peripheral surface of the curled portion formed by folding the cut end of the opening at the upper end is crushed from radially outward and the can axial direction A curled portion having a cylindrical flat portion along the surface is formed, and at the time of cap attachment, the side portion of the cap upper end is crimped to form a stepped portion from the outer peripheral portion to the side portion of the cap top surface portion. It is disclosed that the (packing) is in close contact from the top of the curled portion to the flat portion.
Further, in the bottle can disclosed in Patent Document 3, the curled portion has a cylindrical flat portion formed along the can axis direction on the outer peripheral surface, and the sealing layer of the liner extends from the top of the curled portion to the flat portion. It is pressed. Further, in this patent document 3, the liner of the cap has a two-layer structure of the sliding layer and the sealing layer, and when the cap is attached to the curled portion of the bottle can, the sealing layer of the liner is pressed against the curled portion It is supposed to be
In the bottle cans described in Patent Document 2 and Patent Document 3, the liner closely contacts in a wide range from the top of the curled portion to the flat surface of the outer peripheral surface, and between the top of the curled portion and the flat surface of the outer peripheral surface Since the bent portion of the bite bites into the liner, high sealing performance can be ensured.

JP 2004-154862 A JP 2001-213417 A JP, 2008-213039, A

By the way, when filling a beverage such as coffee in this kind of bottle can, retort sterilization may be performed at high temperature exceeding 100 ° C. and high pressure. In the bottle can subjected to retort sterilization, the liner is easily denatured, so it is difficult to realize sealing performance, drop strength, and low opening torque. In addition, in the case of a bottle can with a particularly large diameter (for example, screw outer diameter 32 mm to 40 mm), when filling a carbonated beverage, the internal pressure of the can rapidly rises when the can is dropped, so high drop strength characteristics are required. .
In the bottle can described in Patent Documents 1 and 2, it is difficult to obtain sufficient drop strength when retort sterilization is performed. In addition, the opening torque also tends to increase.
Although the bottle can disclosed in Patent Document 3 achieves sufficient drop strength and low opening torque even when retort-sterilized, it is insufficient for carbonated beverages.
When a carbonated beverage is filled, the internal pressure rapidly rises when the can falls by the vending machine, so that further improvement in the drop strength is required.

  The present invention has been made in view of such circumstances, and it is a liner that can maintain excellent sealing performance even for carbonated beverages and can achieve low opening torque as well as retort sterilization. It is an object of the present invention to provide a cap with a cap and a bottle can with a cap.

  The linered cap of the present invention is a linered cap mounted on the curled portion of a bottle can having a curled portion at the open end, the top surface portion and a cylindrical portion substantially hanging from the periphery of the top surface portion A liner formed by laminating a cap body provided with the above, a sliding layer provided on the inner surface of the upper surface portion and in contact with the inner surface of the upper surface portion, and a sealing layer contacting the curled portion; A ridge attached to the outer periphery of the sealing layer, the ridge being capable of being in close contact with the outer peripheral side lower portion of the curling portion when the sealing layer of the liner is pressed against the top of the curling portion; The parts are provided along the circumferential direction.

In this linered cap, when mounted on the curled portion of a bottle can, the projecting portion closely contacts not only the top of the curled portion but also the outer peripheral side lower portion of the curled portion, so that the internal pressure acts on the cap In this case, the ridges of the cap come in closer contact with the outer peripheral lower surface of the curled part, and high sealing performance can be maintained.
Caps with high sealing performance generally have a large torque for opening and become difficult to open, but the surface in contact with the top surface of the cap body is formed by the sliding layer, and the cap body and the liner slide when opening. Therefore, it is easy to open even though the sealability is high.
In addition, the sealing layer is softened at the time of retort sterilization, and thus has flexibility to allow the curled portion of the bottle can to bite. On the other hand, when the content is a carbonated beverage, it is difficult to firmly squeeze the curled portion into the sealing layer because there is no heat sterilization process. Therefore, in the present invention, the ridge portion is formed in the sealing layer, and by drawing the outer peripheral end of the cap top surface, the ridge portion reaches the lower portion on the outer peripheral side of the curled portion, so high surface pressure is obtained. And the drop strength characteristics are dramatically improved.

  In the bottled can of the present invention, the cap is attached to the curled portion of the bottle can having a curled portion at the opening end, and the ridge portion of the cap is in close contact with the outer peripheral side lower portion of the curled portion. There is.

As a preferred embodiment of the capped bottle can of the present invention, the liner may abut over the range from the top of the curled portion to 3/4 of the height of the curled portion.
The tightness of the liner can be further enhanced by bringing the liner into close contact with a wide range from the top of the curled portion to the outer peripheral side of the curled portion.

As a preferred embodiment of the capped bottle can of the present invention, the liner is separated from the outer peripheral surface of the curled portion between the close contact portion between the top of the curled portion and the outer peripheral side lower portion of the curled portion. May be formed.
Compared with the case where the liner is in close contact with the entire surface of a wide range from the top of the curled part to the lower part of the outer peripheral side of the curled part, the contact area to the outer peripheral side lower part of the curled part becomes smaller The pressing force of the protruding portion can be increased.
In addition, the capped bottle can of the present invention can be suitably used for a positive pressure can.

  According to the present invention, even when the top surface of the cap bulges due to the internal pressure, the protrusion can be in close contact with the lower portion on the outer peripheral side of the curled portion, and excellent sealing performance can be maintained. Since the sliding layer is provided, the opening torque can also be lowered.

It is the front view which showed the state before capping with the cap with a liner and bottle can of 1st Embodiment of this invention, and made the right half a cross section from the center passing through a can axis. (A) is a cross-sectional view of the right half from the center passing through the can axis, showing the relationship between the vicinity of the cap of the bottle can and the cap in the state before capping and (b) in the state after capping. It is an expanded sectional view of liner outer peripheral part vicinity of the cap shown by Fig.2 (a). It is an expanded sectional view of curl part vicinity shown by Fig.2 (a). It is an expanded sectional view of curl part vicinity after cap mounting shown by FIG.2 (b). It is process drawing which shows the first half part of the manufacturing process of a bottle can in order of (a)-(c). It is process drawing which shows the latter half part of the manufacturing process of a bottle can in order of (a)-(c). It is a schematic diagram which shows the principal part of a capping apparatus. It is a sectional view like Drawing 3 of a cap with a liner of a 2nd embodiment of the present invention. It is sectional drawing like FIG. 5 which shows the state which capped the cap with a liner of FIG. 9 at the curl part of a bottle can. It is sectional drawing like FIG. 3 of the cap with a liner of 3rd Embodiment of this invention. It is sectional drawing like FIG. 5 which shows the state which capped the cap with a liner of FIG. 10 at the curl part of a bottle can. It is sectional drawing like FIG. 5 which shows the state which capped the cap with a liner of 4th Embodiment of this invention at the curl part of a bottle can. It is sectional drawing which shows three types of comparative examples tested for comparison, when the effect confirmation test about the Example of the liner cap of this invention was done.

Hereinafter, embodiments of a liner cap and a cap can with a cap according to the present invention will be described with reference to the drawings.
The cap 1 with a liner of the first embodiment is, as shown in FIG. 1, for example, a bottle can 3 made of aluminum or aluminum alloy (made of metal) having a diameter of 38 mm (the outer diameter of the bottle side screw portion 35 is 36 mm to 38 mm). It becomes a pill-fur proof cap which is attached to the cap 33 of the case and sealed.
The cap 1 with a liner includes a cap main body 6 having a top surface 4 and a cylindrical portion 5 substantially hanging from the periphery of the top surface 4 by forming an aluminum or aluminum alloy plate material into a cup shape, and its cap And a liner 2 provided on the inner surface of the cap body 6.

The cylindrical portion 5 of the cap main body 6 has a cylinder upper portion 8 and a cylinder lower portion 9 which are divided up and down via slits 7 formed intermittently in the circumferential direction at the lower end portion, and between adjacent slits 7 A plurality of bridges 7a are formed to connect the cylinder upper portion 8 and the cylinder lower portion 9 to each other.
The liner 2 inserted into the cap body 6 has a two-layer structure of a sliding layer 21 sliding on the inner surface of the top surface 4 of the cap body 6 and a sealing layer 22 laminated on the sliding layer 21. ing. The sliding layer 21 has a hardness higher than that of the sealing layer 22 and is formed of a polypropylene resin or the like into a disk shape having a substantially uniform thickness. The sealing layer 22 is formed of a flexible elastomer resin or the like, and has a sealing function to seal the inside of the bottle can 3 by coming into contact with a curled portion 37 described later when mounted on the mouthpiece 33 of the bottle can 3 .

Further, in the embodiment, the sealing layer 22 is formed so that the outer diameter is slightly smaller than the sliding layer 21 in the embodiment, and the thick seal portion 24 is formed around the outer peripheral portion with respect to the relatively thin central portion 23. It is formed in an annular shape along the direction. For example, the sliding layer 21 is formed to have a thickness of 0.2 mm to 0.6 mm, and the seal portion 24 of the sealing layer 22 is formed to have a thickness of 0.6 mm to 0.9 mm. It is preferable to form the sealing layer 22 thicker than the sliding layer 21. Further, a protruding portion 25 is formed along the circumferential direction at the outer peripheral edge portion of the seal portion 24 so as to further rise from the surface of the seal portion 24.
The protruding portion 25 is provided to be inclined with respect to the can axial direction so as to slightly expand in diameter toward the tip end in the projecting direction. The angle θ between the inclined surface 25a on the inner periphery and the surface of the seal portion 24 is preferably 55 ° to 85 °. In addition, the protrusion height H1 of the protruding portion 25 is a dimension that can be brought into close contact with the outer peripheral side lower portion of the curled portion 37 when the cap 1 is attached to the curled portion 37 of the bottle can 3 as described later It is formed to .3 mm to 2.5 mm.

  In addition, as shown in FIG. 1, a plurality of knurled recesses 11 and a plurality of slit holes are formed in the circumferential direction in the form of slits in the vicinity of the top surface portion 4 of the cylindrical portion 5 of the cap 1. 12 are alternately provided along the circumferential direction of the cylindrical portion 5, for example. The vent hole 12 is formed between the upper opening end 12 a and the lower opening end 12 b, and the upper opening end 12 a and the lower opening end 12 b are radially inward of the cylindrical portion 5. It is bent toward the end.

The knurled recess 11 and the upper opening end 12a and the lower opening end 12b of the vent hole 12 have a concave shape on the outer peripheral surface of the cylindrical portion 5, and they are spaced apart to form a cylindrical portion. An uneven surface is formed on the outer peripheral surface of the cover 5, and it is possible to increase the frictional resistance with the finger holding the liner cap 1 at the time of opening. This makes it possible to grip the cap with liner 1 without sliding the hand, and facilitates opening.
Further, as shown in FIGS. 2 and 3, the tip of the upper open end 12 a of the vent hole 12 is positioned radially inward of the outer peripheral edge of the liner 2 when inserted, and the lower end It is located at the same position in the radial direction as the tip of the open end 12 b or slightly radially inward of the tip.

  The liner 2 is attached to the cap main body 6 by inserting the liner 2 separately prepared into the cap main body 6 from above, with the cap main body 6 placed with the open end facing upward. By disposing the liner 2 between the top surface 4 and the upper open end 12 a by passing over the lower open end 12 b and the upper open end 12 a of the radially inward vent hole 12 of 5. To be done. Alternatively, it is possible to form the liner 2 by dropping the synthetic resin sphere in a molten state into the cap main body 6 placed with the open end facing upward and molding it in the cap main body 6 is there. In the case of molding in the cap body 6, the sliding layer 21 is separately formed from a sheet and inserted into the cap body 6, and the sealing layer 22 is molded on the sliding layer 21 or sliding The layer 21 may also be molded in the cap body 6, and the sealing layer 22 may be molded on top of the layer 21.

  Among them, when the sliding layer 21 is formed by molding, the sliding layer 21 can slide with the cap main body 6 at the time of opening after attaching the cap 1 with a liner to the bottle can 3. The inner surface of the cap body 6 is preferably an epoxy-phenol based resin to which the polypropylene resin or the like constituting the sliding layer 21 does not adhere at the time of molding, and one containing glycerin and fatty acid ester such as olive oil is used. be able to. In the case of a paint containing a polyolefin resin, the composition may be adjusted to such an extent that the sliding layer 21 is not firmly fixed. Further, by applying silicone oil to the inner surface of the cap body 6, the sliding layer 21 is prevented from adhering to the top surface, and the gas barrier properties of the liner 2 are also improved. In this case, polyolefin wax can be added to the inner surface paint of the cap body 6, and friction with the bottle side screw 35 can be reduced to reduce torque.

  On the other hand, in the bottle can 3 to which the cap 1 with a liner is attached, the reduced diameter portion 32 is formed on the straight cylindrical body portion 31 and the mouthpiece portion 33 is formed above the reduced diameter portion 32 . A bulging portion 34 that protrudes radially outward is formed at the lower end portion of the mouthpiece portion 33, and a bottle side screw portion 35 is formed above the bulging portion 34 and is directed upward above the bottle side screw portion 35. A tapered portion 36 whose diameter is gradually reduced according to the shape is formed, and at the upper end of the tapered portion 36, a curled portion 37 formed by folding the cut end portion in the can axial direction is formed.

  In order to manufacture this bottle can 3, first, an aluminum plate material is punched out and drawn to form a shallow cup 51 having a relatively large diameter as shown in FIG. Drawing and ironing (DI processing) to form a cylindrical body 52 of a predetermined height as shown in FIG. 6 (b), and trimming the upper end thereof. By this DI processing, the bottom of the cylindrical body 52 is formed into the shape of the bottom 3 a as the final bottle can 3.

  Next, the opening end of the cylindrical body 52 is subjected to diameter reduction processing (neck-in processing) to form the body portion 31 and the diameter reduction portion 32, and a cylindrical portion 54 extending in the can axial direction above the diameter reduction portion 32. Then, the cylindrical portion 54 is expanded and reduced in diameter again to form the cylindrical portion 55 before screwing, and the cylindrical portion 55 is screwed to form the bottle side screw portion 35. Form. An opening cylindrical portion 57 is formed above the bottle side screw portion 35 via a tapered portion 36. The opening cylindrical portion 57 is processed to form a curled portion 37.

  As shown in FIG. 4, the curled portion 37 of this embodiment is convex in the radially inward direction while being bent outward in the radial direction from the upper end of the tapered portion 36 in the longitudinal cross section along the can axis direction. And the zenith bent so as to be convex toward the tip direction in the can axial direction while being folded back from the upper end of the inner circumferential side bent portion 41 toward the lower end in the can axial direction. A bending portion 42, a substantially cylindrical outer peripheral cylindrical portion 43 extending downward in the can axial direction from an outer peripheral end (folded end) of the zenith curved portion 42, and a lower end of the outer peripheral cylindrical portion 43 radially inwardly while bending from And an extending curled end 44.

  The curled portion 37 is formed by rounding the cut end portion of the open cylindrical portion 57 (see FIG. 7B) so as to turn it back, and then processing the outer peripheral portion so as to squeeze radially inward. Therefore, the cylindrical outer peripheral cylindrical portion 43 is formed on the outer peripheral side. An arc connecting portion 45 with a slight radius of curvature is formed between the outer circumferential cylindrical portion 43 and the zenith bending portion 42. In this case, the outer peripheral cylindrical portion 43 is formed not only in the case of forming a substantially flat cylindrical surface in the can axis direction, but also on a curved surface having a large radius of curvature of about 8 mm. It may be Further, the curvature radius of the outer surface of the curled end portion 44 is about 0.2 mm to 1.2 mm. In this case, the curled end portion 44 is formed in a curved arc surface shape as a whole, but it may be formed in a straight inclined surface shape which gradually inclines inward in the radial direction as it goes downward in the can axial direction. Alternatively, an arc connecting portion with a slight radius of curvature may be formed between the curled end portion 44 and the outer peripheral cylindrical portion 43.

When attaching the cap 1 with a liner to the mouthpiece 33 of the bottle can 3, for example, a capping device provided with a plurality of capping heads 70 as shown in FIG. 8 is used.
The capping head 70 includes a pressure block 62 having a cap presser 61, a first roll 63 as a thread forming roll, and a second roll 64 as a pill fur proof roll. The lower end portion of the pressure block 62 is formed in a cylindrical shape, and the pressure block 62 is relatively movable in the can axial direction with the cap press 61 disposed inside the pressure block 62, and the spring 65 is provided between the pressure block 62 and the cap press 61 ing. In addition, the first roll 63 and the second roll 64 are supported rotatably around the pressure block 62 and movably in the can axial direction.

  Then, as shown in FIG. 5, the cap presser 61 presses the top surface 4 of the cap 1 in a state where the cap 1 is covered on the mouthpiece 33 of the bottle can 3, and the pressure block 62 is the outer peripheral portion of the top surface 4 in that state. Squeeze. As described above, the cap 1 is drawn by the pressure block 62 when the cap is attached, whereby the diameter of the portion from the outer peripheral portion of the top surface 4 of the cap 1 to the upper end of the cylindrical portion 5 is reduced. The throttling portion 4a is annularly formed on the outer surface. Then, on the inner side of the cap 1, the seal portion 24 of the sealing layer 22 of the liner 2 is pressed against the zenith bending portion 42 of the curled portion 37, and the portion radially outside of the zenith bending portion 42 is from the arc connection portion 45 It is bent downward along the outer surface shape of the outer peripheral cylindrical portion 43, and the bent portion is pressed radially inward. Thereby, the seal portion 24 is in close contact with the surface of the upper end portion of the outer peripheral cylindrical portion 43 from the zenith bent portion 42 of the curled portion 37. Further, the tip end of the protruding portion 25 provided on the outer peripheral portion of the sealing portion 24 is also pressed radially inward by the diameter reduction of the cap 1 in the narrowed portion 4 a, and the curled end portion 44 of the curled portion 37 Press against the outer peripheral surface. Further, as shown in FIG. 5, the liner 2 is most compressed between the arc connection portion 45 of the curled portion 37 and the cap main body 6, and the thickness t thereof is reduced.

  After the drawing process by the pressure block 62 is performed, the cap side screw portion 38 is formed along the bottle side screw portion 35 in the cylinder upper portion 8 of the cap 1 by the first roll 63 and the cylinder lower portion by the second roll 64 9 is wound around the bulging portion 15 and fixed. As a result, the liner 2 is in pressure contact with the curled portion 37, the cap 1 is mounted on the mouth portion 33, and the bottle can 3 is sealed to form a capped bottle can 10. The throttling depth S of the top surface of the cap 1 is preferably 1.5 mm to 2.0 mm.

  When the bottled can 10 thus sealed is a beverage such as coffee to which retort sterilization is applied, it is filled with liquid nitrogen and becomes a positive can. Moreover, it is suitable also when using as a positive pressure can which uses carbonated beverages as a content. That is, the internal pressure acting on the bottle can 3 as a positive pressure can acts to lift the top surface 4 of the cap 1 upward in the can axial direction, and accordingly, the inner peripheral portion of the seal portion 24 curls The pressing force of the portion 37 on the inner circumferential side bending portion 41 acts in the direction of decreasing, but in the protruding portion 25 of the sealing portion 24, the curling end is reversed by the moment centered on the most compressed portion. It acts in a direction to increase the pressing force on the part 44. Therefore, the seal portion 24 of the liner 2 is in pressure contact with the curled portion 37 at the curled end portion 44 of the curled portion 37 from the zenith bent portion 42 to the upper portion of the outer peripheral cylindrical portion 43, and high sealing performance can be maintained. .

In the case of retort sterilization, the sealing layer 22 is softened by heat treatment at a temperature exceeding 100 ° C., and the curled portion 37 bites into and is in close contact with the curled portion 37, so the sealing property is high and the drop strength is also excellent. When the content is a carbonated beverage, it is not heat-sterilized, so the biting of the sealing layer 22 into the seal portion 24 by the curl portion 37 is insufficient. Therefore, in addition to the range in close contact with the curled portion 37 to the range from the zenith bent portion 42 of the curled portion 37 to the upper portion of the outer peripheral cylindrical portion 43, the ridge portion 25 of the seal portion 24 is also in pressure contact at the curled end portion 44. As a result, the pressure is applied to the curled portion 37 in a wide range to improve the sealing performance.
On the other hand, if the curled portion 37 and the sealing layer 22 of the cap 1 are in close contact with each other in a wide range, there is a possibility that the opening torque will be high. Because the cap body 6 and the sliding layer 21 slide at the time of opening, an increase in the opening torque can be suppressed.

  In the embodiment described above, the ridges 25 provided on the outer peripheral edge of the seal portion 24 of the liner 2 are brought into close contact with the curled end 44 of the curled portion 37 and from the zenith bend 42 of the curled portion 37 A gap g is formed between the curled portion 37 and the seal portion 24 between the closely-contacted portion up to the upper portion 43 and the closely-contacted portion by the protrusion 25 and between the closely-contacted portions (see FIG. 5). Therefore, the contact area between the ridge 25 and the curling portion 37 is reduced, and the pressing force of the ridge 25 on the curling portion 37 can be increased.

The above-described first embodiment may be the second embodiment shown in FIGS. 9 and 10, the third embodiment shown in FIGS. 11 and 12, and the fourth embodiment shown in FIG.
In the second embodiment, the sealing layer 22 in the liner 2 of the cap 100 is provided with the projecting portion 27 having a triangular shape in a longitudinal cross section passing from the outer peripheral edge of the sealing portion 24 through the can axis. The projecting portion H2 has a projecting height H2 higher than that of the projecting portion 25 in the first embodiment, and the angle θ with respect to the surface of the sealing portion 24 of the inclined surface 27a is also large. The angle θ is preferably 60 ° to 90 °. The outer peripheral surface from the tip of the ridge 27 to the surface of the sliding layer 21 is also inclined so as to gradually increase in diameter toward the tip in the protruding direction, though slightly. The protrusion height H2 of the protrusion 27 is preferably 1.5 mm to 2.7 mm.

Then, in the capped bottle can 110 in which the cap 100 is attached to the curled portion 37 of the bottle can 3, the entire inclined surface 27 a of the projecting portion 27 is in pressure contact with the curled portion 37 from the outer peripheral portion of the sealing portion 24. It has become. In this case, the range of the seal portion 24 in close contact with the curled portion 37 reaches the vicinity of the lower bent portion 45 of the curled end portion 44 from the zenith bent portion 42 of the curled portion 37 via the outer peripheral cylindrical portion 43 Close closely with no gap. In this embodiment, the close range of the liner 2 to the curled portion 37 extends to 3/4 or more of the height H (see FIG. 4) of the curled portion 37 when it is captured by the length L along the can axis direction. You Further, in the present embodiment, the protrusion 27 does not reach the tip of the curled end 44 but abuts a range to a position slightly beyond the base end of the curled end 44.
In the capped bottle can 110 of this embodiment, the seal portion 24 of the liner 2 can closely contact the curled portion 37 in a wide range to exhibit excellent sealing performance, and the sliding layer 21 is provided. As a result, the opening torque can also be lowered.

  In the cap 120 of the third embodiment shown in FIG. 11 and FIG. 12, like the cap 100 of the second embodiment shown in FIG. 9 and FIG. Although a protruding portion 28 having a triangular shape in a longitudinal cross section passing from the peripheral edge through the can axis is provided, the diameter of the outer peripheral edge of the sealing portion 24 is larger than that of the second embodiment, The protrusion height H3 of the protrusion 28 is also formed large. In this case, the angle θ2 of the inclined surface 28a on the inner peripheral side of the protrusion 28 is the same as that in the second embodiment. The projection height H3 is preferably 1.7 mm to 2.9 mm. The tip end of the projecting portion 28 is formed in a convex arc shape.

Then, in the capped bottle can 130 in which the cap 120 is attached to the curled portion 37 of the bottle can 3, the whole of the inclined surface 28 a of the projecting portion 28 from the outer peripheral portion of the sealing portion 24 includes the tip of the curled end 44. The entire outer peripheral surface of the curled portion 37 is in pressure contact.
Thereby, the sealing performance can be further improved.

  Further, in the cap can 150 of the fourth embodiment shown in FIG. 13, when the projecting portion 29 of the cap 140 is slightly larger than that of the third embodiment and mounted on the curled portion 37 of the bottle can 3. The whole of the inclined surface 29a of the protrusion 29 from the outer peripheral portion of the seal portion 24 is in pressure contact with the entire outer peripheral surface of the curled portion 37 including the tip of the curled end 44. It is made to contact | abut on the outer surface of the taper part 36 of three. In this case, the tip of the projecting portion 29 may not be a convex arc surface but may be a sharp tip.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
As the curled portion 37, one in which the curled end portion 44 is provided downward in the can axial direction is exemplified, but as the curled portion of the bottle can to which the cap of the present invention is attached, as described in Patent Document 1 In the curled part of the outer winding where the cut end of the opening is folded more than double and rolled up, the curled part where the cut end of the opening is folded back at the upper end and the longitudinal cross section is formed cylindrical It can apply.
In that case, the outer peripheral side lower portion of the curled portion has a substantially inclined surface curled end through a bent portion (bent portion of the outer peripheral lower portion in the curled portion described in Patent Document 1) which is convex downward and obliquely with respect to the can axis direction. The part is formed by a continuous part or a cut end which is folded back at the upper end and turned downward, and the ridge of the liner is in close proximity to the bent part or the cut end or the vicinity of the cut end. When the lower bent portion is formed in the curled portion, the ridges of the liner may be in close contact with at least a position beyond the upper end of the lower bent portion (the connection end with the outer peripheral cylindrical portion).
Further, in the embodiment, the outer peripheral cylindrical portion of the curled portion is formed in a cylindrical shape substantially along the can axis direction, but may not necessarily be a straight cylindrical shape, and has a convex surface which gently expands in the radial direction. It may be formed. In addition, the diameter may be slightly inclined with respect to the can axial direction so as to gradually decrease in diameter from the tip end in the can axial direction toward the can bottom direction.

An aluminum or aluminum alloy (metal) bottle can with a diameter of 38 mm (nominal diameter) is filled with gas water so that the internal pressure can be 0.9 KPa at room temperature, and the cap shown in FIG. The linered cap of one embodiment (Example 1) and the linered cap of the second embodiment shown in FIGS. 9 and 10 (Example 2) were mounted.
Moreover, the bottle can which equipped with each cap 101,102,103 shown by FIG. 14 (a) (b) (c) was also produced as a comparative example. The curled portions 104 and 106 of the bottle can have the same shape as the above-described embodiment in FIGS. 14 (a) and 14 (c), but in FIG. 14 (b), they are doubly folded as described in Patent Document 1. The curled portion 105 was used. In the caps 101 to 103 of these comparative examples, the liners 107, 108 and 109 are all formed by molding in the cap body. Further, the caps 101 and 103 in FIGS. 14A and 14B have the ridges 110 and 112 disposed inside the curled portions 104 and 106 and the ridges 111 disposed on the outside of the curled portions 104 and 106. , 113 are formed. In the cap 103 of FIG. 14C, only the ridges 114 disposed inside the curled portion 106 are formed, but the cap 103 is not in contact with the curled portion 106.

The schematic dimensions of the bottle can were as follows.
-Thread outer diameter of bottle can: 36 mm to 38 mm
・ Curl part outside diameter: 33.0 mm-33.8 mm
・ Skirt part (expansion part 34) outside diameter: 37 mm-39 mm
・ Can height: 128mm-132mm
-Depth of drawn part (4a): 1.4 mm to 1.8 mm
· Thread height: 0.65 mm (average value of 10 cans measured at 3 locations in the circumferential direction)
-Neck (lower part of the bulging part 34) thickness: 0.300 mm to 0.34 mm
・ Wall (thinnest part of body 31) Thickness: 0.120 mm to 0.130 mm
-Can weight: 19.5 g to 20.5 g

The specifications of the cap were as follows.
・ Cap outer diameter 38mm
· A cap body made of aluminum alloy with a thickness of 0.25 mm coated on the inner and outer surfaces · A sliding sheet made of polypropylene with a thickness of 0.5 mm is inserted into the cap body, and the sealing layer has a thickness of the sealing portion 24 The dimension of 0.8 mm and the protrusion height H1 of the protrusion 25 was 2.4 mm.

About these bottled cans, after filling, they were left for 1 day, and then the measurement of opening torque and the inclined drop test were carried out.
The opening torque was determined by measuring the torque at which the cap starts rotating at the time of opening (first torque) and the torque at which the bridge is broken (second torque) at room temperature for 10 cans at room temperature. .
In the inclined drop test, 10 cans of a bottle can were dropped with the caps downward from various heights on steel plates inclined 10 ° from the horizontal surface, and the presence or absence of leakage was confirmed. The presence or absence of a leak measured the weight before and behind a drop test, made the case where the difference became 20 mg or more as a leak can, and described the number in the table.
The results are shown in Table 1. In the table, "-" indicates that the test was not performed.

  As is clear from Table 1, the capped bottle can of the example had a low opening torque, and no leak in the 80 cm high inclined drop test.

1, 100, 120, 140 Lined cap 2 Liner 3 Bottle can 4 Top surface portion 4a Throttle portion 5 Cylindrical portion 6 Cap body 7 Slit 7a Bridge 8 Tube upper part 9 Tube lower part 11 Barbed recess 12 Vent hole 12a Upper opening end 12b Lower Side open end 21 Sliding layer 22 Sealing layer 24 Sealing part 25, 27 Projection 27a Inclined surface 31 Body part 33 Base part 34 Expansion part 35 Bottle side screw part 36 Taper part 37 Curl part 38 Cap side screw part 41 Inner side bending portion 42 Zenith bending portion 43 Outer peripheral cylindrical portion 44 Curl end 44a Tip corner 45 Arc connecting portion 62 Pressure block 10, 110, 130, 150 Bottle can with cap

Claims (4)

  A cap with a liner attached to the curled portion of a bottle can having a curled portion at an opening end, the cap main body including a top surface portion and a cylindrical portion substantially suspended from the periphery of the top surface portion; A liner formed on the inner surface of the surface portion and in contact with the inner surface of the top surface portion and a sealing layer contacting the curled portion, the outer peripheral edge portion of the sealing layer of the liner being provided A ridge is provided along the circumferential direction that can be in close contact with the outer peripheral side lower portion of the curled portion when the sealing layer of the liner is attached to the curled portion and the sealing layer of the liner is pressed against the top of the curled portion. Lined cap characterized by being   The cap according to claim 1 is attached to the curled portion of the bottle can having a curled portion at the opening end, and the ridge portion of the cap is in close contact with the outer peripheral side lower portion of the curled portion. A bottle can with cap.   3. The capped bottle can according to claim 2, wherein the liner abuts over the range from the top of the curled portion to 3/4 of the height of the curled portion.   The liner according to claim 2, wherein the liner is separated from the outer peripheral surface of the curled portion between the close contact portion between the zenith portion of the curled portion and the outer peripheral side lower portion of the curled portion to form a gap. Bottle can with cap.

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