JP2001206368A - Easy-to-open can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-open can lid which can be simply opened even when applied in a pressurized can and is highly durable. SOLUTION: The easy-to-open can lid 1 formed with an annular projection 10 which axially projects from a flange rolled around an opening end 4 of a can barrel 3 is formed with a fold 14 with a part distant from a periphery 12 of a panel wall 40 folded. A first tear-open line 19 is formed on the lowermost layer 18 of the fold 14. A second tear-open line 31 further cuts the panel wall 40 completely in its thickness direction except distant parts at both ends. A second opening piece 26 is overlaid on a surface on a side of the can barrel 3 in a first opening piece 1, and its overlap 50 is sealed by a sealant 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy opening can lid which can be easily opened and has a shape such that a beverage or the like sealed in a can body is easy to drink or pour out.

[0002]

2. Description of the Related Art Conventionally, as an easy open end,
There is a lid of a type in which an opening piece defined on a can lid by a score line is pressed down by a tab. However, this type of lid requires an apparatus for manufacturing a tab separately from the end, and thus has a disadvantage of increasing the manufacturing cost. Therefore, various easy open ends that do not use tabs have been proposed.
For example, there are those described in JP-A-8-169454 and those described in U.S. Pat. No. 4,976,368.

The configuration described in Japanese Patent Application Laid-Open No. 8-169454 has an annular groove formed on a peripheral edge of a lid member and an inner circumferential side of the annular groove. The skirt includes a skirt extending toward the axis, and a panel recessed from the annular flat portion at the tip of the skirt toward the container body. Further, a concave press-down tab surrounded by a score line is formed in the panel portion. That is, when opening the can lid,
The score line is broken by pressing the concave press-down tab with a finger, and further, the concave press-down tab is pressed down into the container main body, and the opening piece is hung to open the can lid.

On the other hand, in the configuration described in US Pat. No. 4,976,368, an outer peripheral wall protruding upward from a can lid, a flat annular panel extends inward from the outer peripheral wall, and further extends downward from the annular panel. , The lower end of the inner peripheral wall is folded into three layers, and an opening piece is defined by a score line formed in the lowermost layer. A convex tab is formed on this opening piece, and when opening the can lid, the convex tab is pressed down with a finger to break the opening piece at the portion of the score line, and the opening piece is hung on the inner surface side of the can lid. Put it down and open the can lid.

However, in any of the above-mentioned inventions, when the contents of the can are carbonated beverages or the like, the inner pressure of the can acts as a force resisting the pushing force of the pushing-down tab or the opening piece, so that it becomes difficult to open. There is a disadvantage that.

A can lid which can be easily opened even when applied to a can with high internal pressure is disclosed in US Pat.
No. 89. This consists of a substantially frustoconical protruding portion that protrudes outward in the axial direction of the can body, an annular vertical wall formed by vertically folding the leading edge of the protruding portion, and a panel portion surrounded by the vertical wall. And In the panel portion, a first opening piece partitioned by a first breaking line,
A small-diameter second opening piece partitioned on the inner peripheral side of the first opening piece by the second breaking line is provided. The second opening piece is set higher than the first opening piece in the protruding direction of the protruding portion. The first break line and the second break line are formed by substantially circular score lines separated from each other at both ends, and further, each break line on the inner surface side of the can lid and an adjacent portion are coated with a sealant. I have.

Therefore, according to the can lid having the above structure, the second opening piece is easily pressed by a finger and has a small opening area, so that the second opening piece is smoothly opened before the first opening piece. Since the gas inside the can escapes from the opening formed at that time, the first opening piece can be pressed with a finger in a state where the internal pressure of the can is reduced, and as a result, the first opening piece can be easily opened.

[0008]

However, in the can lid described in U.S. Pat. No. 4,244,489, no special consideration is given to holding the sealant near each breaking line, so that the can lid is not used. When the sealant is applied while being rotated, the sealant is forced to flow outward in the radial direction of each break line by centrifugal force, so that a so-called thick coating cannot be performed. Therefore, each break line is not sufficiently protected, and there is a possibility that corrosion may occur due to breakage of each break line due to internal pressure or damage to the sealant due to drop impact of a can or the like.

Further, in this can lid, in order to ensure the airtightness of the second break line, a small diameter second break line is covered by a folded portion in which a part of the first opening piece is triple folded. . Forming the folded portion around the second opening piece having a small area in this way not only increases the forming process, but also easily damages the coating film and the metal member, as a result,
There was a possibility that corrosion of the metal member and cracking of the metal member might occur due to damage of the coating film.

Further, in this can lid, since the first breaking line is formed just below the annular vertical wall at the tip of the protruding portion, the annular vertical wall collides with the ground or the like by accidentally dropping the can. In this case, the impact force acts directly on the first breaking line, and the first breaking line is inevitably broken. That is, there is a problem that the openings are inadvertently opened.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a durable easy-open can lid that can be easily opened even when applied to an internal pressure can.

[0012]

In order to achieve the above object, the invention according to the first aspect of the present invention comprises a flange portion which is fixedly wound around an open end of a cylindrical can body. A can lid provided on the outer peripheral portion, wherein an annular projection protruding outward from the flange portion in the axial direction is formed, and the annular portion is axially separated from the tip edge of the projection. A panel wall is formed so as to close the opening of the protruding portion, and the panel wall has a substantially circular first opening piece defined by a first breaking line which is curved at both ends and is broken by a pressing force. Is provided, a sealant is applied in a state of covering the first breaking line, and further, on the inner peripheral side of the first opening piece, both ends are separated from each other in a curved shape, and the first opening piece is broken by a pressing force. A substantially circular second opening delimited by two break lines In the easy-open can lid provided with a piece, a folded portion is formed by folding at least a portion of the panel wall inwardly away from the peripheral edge at least three times, and the protrusion of the plurality of layers in the folded portion is formed. The first break line is formed in the layer farthest from the leading edge of the portion, and the second break line further cuts the panel wall completely in the thickness direction except for the separated portions at both ends. In addition, the second opening piece is polymerized on the surface of the first opening piece on the side of the can body, and the polymerized portion is covered with a sealant and closed.

Accordingly, according to the first aspect of the present invention,
By pressing the second opening piece, the second break line is broken and a small-diameter opening for degassing is formed in the panel wall,
From here, carbon dioxide gas or nitrogen gas inside the can escapes to the outside. Since the circumference of the second breaking line is short, the load required for the opening is small. When the first opening piece is further pressed, the first breaking line is broken, and an opening having a larger diameter than the opening for venting is formed in the panel wall. In that case, since the opening for degassing is formed prior to the breaking of the first breaking line and the external pressure and the internal pressure of the can body are the same, it is necessary to open the first opening piece. Heavy load is reduced. This opening functions as an opening for taking out the contents.

According to the first aspect of the present invention, the first break line, which is a weak portion of the panel wall, is located on the inner peripheral side of the leading edge of the protruding portion. Even if the tip edge of the protruding portion collides with the ground or the like when dropped, the impact force does not directly act on the first breaking line. Easy opening is prevented beforehand.

Further, according to the first aspect of the present invention, the peripheral edge of the second opening excluding the hinge portion is overlapped with the inner surface of the panel wall, and the second opening is covered with a sealant. Therefore, for example, by cutting or breaking the panel wall in the thickness direction to form a second break line, and by extruding the panel wall on the inner peripheral side in the opposite direction to the protrusion, The second opening piece and the second opening of the desired structure can be formed. That is, since it is unnecessary to fold the panel wall into, for example, three layers along the small-diameter second break line, the molding process is simplified,
In particular, the moldability near the second opening piece is improved. As a result, overall production efficiency is improved.

The invention described in claim 2 is the first invention.
In the configuration described in the above, on the outer peripheral side of the folded portion on the panel wall, out of a plurality of layers in the folded portion in a direction opposite to the projecting portion, a layer farthest from a leading edge of the projecting portion among the layers in the folding portion. A substantially annular concave portion that protrudes greatly is formed, and the second break line is located closer to the leading edge of the protrusion than the first break line.

According to the second aspect of the present invention, when the protruding portion is oriented downward with respect to the flange portion, the outer peripheral side of the first breaking line is formed into a recessed portion having a height higher than that of the first breaking line. Part). In the same posture, the outer peripheral side of the second breaking line is surrounded by a panel wall having a higher height.

Therefore, when applying the sealant while rotating the can lid about its central axis, the sealant is prevented from flowing outward in the radial direction due to centrifugal force.
That is, since the sealant can be surely applied to the intended position, so-called thick coating can be performed. Accordingly, the breakage of the first break line and the second break line due to the change in the internal pressure of the can body is prevented beforehand, and the coating film is damaged due to the formation of the first break line and the second break line. Is repaired, so that corrosion of the can lid due to the intrusion of contents such as beverages into the damaged portion is prevented beforehand.

The invention described in claim 3 is the first invention.
Alternatively, in the configuration according to claim 2, the opening diameter of the first opening that appears when the first opening piece is pressed down is set to a diameter of 16 mm or more, and the second opening that appears when the second opening piece is pressed down. The diameter of the two openings is 12m
m or less.

Therefore, according to the invention described in claim 3,
The diameter of the first opening serving as the opening for dispensing the beverage is such that the beverage is easily dispensed and the required lid opening force is relatively small. In addition, the diameter of the second opening serving as the opening for degassing is such that it is easy to open, for example, by pressing with a consumer's finger, and the finger is difficult to enter inside. That is, the configuration is such that there is no risk of cutting the finger.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which an opening-projecting can lid 1 and a can body 2 are shown. The protruding can lid 1 corresponding to the easy-open can lid according to the present invention is formed of a flat plate material (not shown) made of a metal such as an aluminum alloy. Note that an inner surface coating (not shown) made of a synthetic resin is formed on one surface of the flat plate in advance. The inner surface coating is formed from a protective paint or a resin film.

The coating may be any protective coating made of a thermosetting or thermoplastic resin, for example, a modified epoxy coating such as a phenol-epoxy coating or an amino-epoxy coating, a vinyl chloride-vinyl acetate copolymer, or an epoxy-phenol. A single vinyl such as a modified vinyl paint or a modified vinyl paint, or a combination of two or more kinds is used. As the resin film, a polyester resin having ethylene-terephthalate as a basic constitution, for example, polyethylene terephthalate (PET), or a copolymer such as polyethylene terephthalate-isophthalate (PET / I) can be applied. When a resin film is used for the inner surface coating, the resin film may be unstretched or biaxially stretched.

A well-known flange portion (not shown) formed on the outer peripheral side of the opening projecting can lid 1 by being wound and fixed to the opening end portion 4 of the cylindrical can body 3 to form a wound portion 5. Is formed. Further, an annular groove 6 which is recessed substantially downward in FIG. 1 is formed on the inner side in the radial direction of the opening projecting can lid 1 from the winding portion 5. The cross-sectional shape of the annular groove 6 in the axial direction of the can body 3 has a U-shape.

A skirt wall 7 is formed extending from the annular groove 6 toward the center axis of the can body 3 and extending upward in FIG. The skirt wall 7 extends in an arc so that its cross section protrudes outward in the axial direction of the can body 3. A ridge 8 is formed following the upper end of the skirt wall 7 in FIG.

Further, at the upper end of the raised portion 8 in FIG.
A mouth-and-neck portion 9 whose side wall surface slightly projects outward in the radial direction is formed. That is, the mouth-and-neck portion 9 itself has a cylindrical shape having different outer diameters in its length direction. The mouth and neck portion 9 is not limited to the above-described shape, and may be, for example, a cylindrical shape having a constant outer diameter, that is, a shape having a side wall surface substantially parallel to the central axis of the can body 3. Note that a protruding portion 10 is formed by the mouth and neck portion 9, the skirt wall 7, and the raised portion 8.

On the other hand, the wall surface connected to the upper edge of the mouth and neck 9
It is bent toward the inner circumference. That is, a surface that covers the upper edge of the mouth and neck 9 is provided, and the surface is a flat surface that is substantially perpendicular to the central axis of the can body 3. This portion is formed as an annular flat portion 11.
Therefore, the annular flat portion 11 corresponds to the leading edge of the protruding portion 10.

Further, a wall surface connected to the inner edge of the annular flat portion 11 is bent downward in FIG. 1 substantially in parallel with the central axis of the can body 3, and is formed as an inner peripheral wall 12. That is, the inner peripheral wall 12 is a wall that is provided on the inner peripheral side of the mouth and neck portion 9 and has a ring shape as a whole. Further, at the lower edge of the inner peripheral wall 12, there is formed a concave portion 13 whose cross section is curved in an arc shape downward in FIG. The depression 13 is formed over the whole in the circumferential direction, and has a ring shape as a whole. The bottom of the depression 13 is located below the lowermost layer 18 of the folding part 14 in FIG. 1 below.

Further, the inner peripheral wall surface of the recess 13 is inclined upward in FIG. 1 toward the central axis, and this is the first annular wall 15. The wall surface connected from the upper edge of the first annular wall 15 forms a narrow flat surface orthogonal to the central axis of the can body 3, and a part of the flat surface forms a circular shape as a whole. Are folded into three layers, which are formed as folded portions 14.

More specifically, the folded portion 14 is formed by folding the inner peripheral edge of the flat surface downward in FIG. 1 and outward in the radial direction, and furthermore, by folding the folded end to the center of the can body 3. The structure is turned back to the shaft side. That is, as shown in FIG. 3, each layer (the uppermost layer 16, the intermediate layer 17, and the lowermost layer 18) in the folded portion 14 forms a flat surface, and is orthogonal to the central axis of the opening projecting can lid 1. It is parallel to the line.

The lowermost layer 18 of the folded portion 14 has a first break line 19 formed of a score line except for a part thereof. That is, the first breaking line 19 is formed along the folding portion 14 (formed outside the inner peripheral end portion or the inner peripheral bending portion of the folding portion 14), and is formed at both ends. It forms a separated circular shape. A part of the score line may be completely cut in order to improve the openability.

On the other hand, a first opening piece 20 is formed on the inner peripheral side of the first breaking line 19. This first opening piece 20 is
It is a substantially circular member that is formed of a wall surface that is integrally connected to the lowermost layer 18 of the folded portion 14 and that is partitioned by the first breaking line 19. More specifically, the first opening piece 20 has an outer flat portion 21 located at the same height as the lowermost layer 18 and parallel to a line perpendicular to the central axis of the opening projecting can lid 1, A second annular wall 22 continuous with the inner peripheral edge of the flat portion 21 and inclined upward in FIG. 1, and an inner flat portion 23 continuous with the inner peripheral edge of the second annular wall 22 and parallel to the outer flat portion 21
And The inner flat portion 23 is provided at a position higher than the uppermost layer 16 of the folded portion 14 in the projecting direction of the projecting portion 10.

That is, the first opening piece 20 has the first breaking line 1
The portion between the end portions 9 is a first hinge portion 60 and is pushed down inside the protruding portion 10. The opening that appears when the first opening piece 20 is pressed down is the first opening 24. The inner diameter of the first opening 24 corresponds to the inner diameter of the folded portion 14, and is 16 mm as an example.
It is set above. This is a so-called lower limit of a value at which the beverage is easily extracted.

Further, a portion of the first opening piece 20, the folded portion 14, and the first annular wall 15 adjacent to the first breaking line 19 includes:
Plastisol 25 is applied. The plastisol 25 prevents the first break line 19 from breaking due to a change in the internal pressure of the can body 2, repairs damage to the coating film due to the formation of the first break line 19, and opens the opening due to the intrusion of the beverage. This is for preventing corrosion of the protruding can lid 1. By applying the plastisol 25, the leakage of the content liquid can be prevented even if a part of the first break line 19 is completely cut.

A second opening piece 26 protruding upward in FIG. 1 is provided on the inner peripheral side of the inner flat portion 23 in the first opening piece 20. Specifically, this second opening piece 2
Reference numeral 6 denotes a substantially circular projection defined by the inner peripheral edge of the inner flat portion 23, which is continuous with the annular flange 27 closely contacting the inner surface of the inner flat portion 23 and the inner peripheral edge of the annular flange 27, as shown in FIG. And a pressing portion 29 which is continuous with the inner peripheral edge of the inclined wall portion 28 and is parallel to a line perpendicular to the center axis of the opening projecting can lid 1. .

The annular flange portion 27 has a flat surface, and is parallel to a line perpendicular to the central axis of the opening projecting can lid 1. The upper surface of the annular flange portion 27 in FIG. 1 is in close contact with the lower surface of the inner flat portion 23 along the inner peripheral edge of the inner flat portion 23. That is, the outer diameter of the annular flange 27 is set slightly larger than the inner diameter of the inner flat portion 23 of the first opening piece 20, and the annular flange 27 is superimposed on the inner flat portion 23. . And the polymerization part,
The plastisol 30 is formed in the vicinity of the overlap portion 50. Specifically, the annular flange portion 27 and the inner flat portion 2
The plastisol 30 is provided in a state where the third and second annular walls 22 are integrally coated, and the overlap portion 50 is closed.

On the other hand, the pressing portion 29 has a flat circular shape, and the center point in the plan view coincides with the center axis of the opening projecting can lid 1. That is, the pressing portion 29 and the inclined wall portion 28 have a structure protruding from the inside of the inner flat portion 23 in the first opening piece 20 in the same direction as the protruding portion 10. The position of the pressing portion 29 is lower than the annular flat portion 11 of the protruding portion 10 and higher than the inner peripheral edge of the inner flat portion 23 of the first opening piece 20 in the axial direction. By setting as described above, it is possible to prevent an unintended pressing force from being applied to the second opening piece 26, and it is possible to enhance the opening operability.

On the other hand, the inner flat portion 2 serving as the second breaking line 31
The inner peripheral edge of 3 is not completely connected in the circumferential direction,
Part of the structure is interrupted. Both ends of the inner peripheral edge of the inner flat portion 23 are arranged at portions corresponding to both ends of the first break line 19 in the circumferential direction of the protruding portion 10. That is, the end portions of the peripheral edge portion of the inner flat portion 23 are circumferentially coincident with the portion between the end portions of the first break line 19. Therefore, the second opening piece 26 is
The portion between the ends of the second break line 31 is connected to the second hinge 6
The structure 1 is pushed down inside the protruding portion 10.

The opening that appears when the second opening piece 26 is pushed down is the second opening 32, the diameter of which is set to 12 mm or less. This is a value that prevents the consumer's thumb from entering inside. A panel wall 40 is formed by the second opening piece 26, the first opening piece 20, and the recess 13. Although not particularly shown,
The interior of the can 2 is filled with a carbonated beverage, that is, the can 2 is an internal pressure can (positive pressure can).

Here, the method of forming the overlap portion 50 will be briefly described. First, the panel wall 40 is formed into a bulging portion composed of the inclined wall portion 28 and the pressing portion 29 by pressing, and then the panel wall is formed. A second break line 31 is formed by punching in the thickness direction, and then, the second opening piece 26 and the inner surface of the inner flat portion 23 are supported by a flat surface at a predetermined interval, and the second opening piece is formed. By pushing out 26 to the opposite side to the projecting direction of the projecting portion 10 (crushing the height of the bulging portion), the annular flange portion 27 overlaps the inner flat surface 23, and the overlap portion 50 is formed. You.

Next, the operation of the present invention configured as described above will be described. In order to drink the beverage enclosed in the can 2, the consumer first presses the pressing portion 29 in the second opening piece 26 with, for example, a thumb. In this case, since the pressing portion 29 is arranged at the center position of the panel wall 40 and protrudes most from the panel wall 40, so-called alignment is easy.

In this type of can 2, when a carbonated beverage is filled as a content, a force for expanding the first opening piece 20 and the second opening piece of the opening projecting can lid 1 outward. Is operated by carbon dioxide gas. According to the above-described opening-projecting can lid 1, in addition to the pressing portion 29 that protrudes most in the panel wall 40 being provided at a position where the annular flat portion 11 is also lower, The deformation of the first opening piece 20 and the second opening piece 26 is suppressed by the recess 13 that is concave in the direction opposite to the direction in which the first opening piece 20 and the second opening piece 26 swell. It can be prevented from bulging outward beyond the flat portion 11.

By pressing the pressing portion 29 of the bulging portion, a pressing load acts on the second opening piece 26 satisfactorily. Therefore, the portion between the ends of the second breaking line 31 is used as a hinge and The opening piece 26 is pushed down to the inside of the opening projecting can lid 1, and the second opening 32 gradually appears. That is, the second break line 31 is broken, and the plastisol 30 is divided along the break line 31. The diameter of the second opening 32 is 1
Since it is 2 mm or less and the size is such that the thumb is difficult to enter, there is no possibility that the consumer cuts the finger at the inner peripheral edge of the second breaking line 31. Further, by forming the second opening 32, the carbon dioxide gas sealed in the can 2 is discharged to the outside.

When the pressing portion 29 is further depressed, a part of the thumb comes into contact with the inner flat portion 23 of the first opening piece 20, and the first breaking line 19 is broken by the pressing load. In that case, the depression 13 is formed on the outer peripheral side of the first opening piece 20 so that the outer flat part 21 is not excessively bent, and the pressing load is good for the first opening piece 20. In addition to the above, the second opening 32 for ventilation is formed before the first opening 24 is formed, and the external pressure and the internal pressure of the can body 2 are the same. The load required to break the first break line 19 having a relatively long circumference is reduced, and as a result, the first opening 24 is formed smoothly.

That is, the first opening piece 20 is pushed down to the inside of the opening projecting can lid 1 using the portion between the ends of the first breaking line 19 as a hinge. In addition, since the position of the hinge of the second opening piece 26 coincides with the position of the hinge of the first opening piece 20 in the circumferential direction, the consumer can change the direction of the can body 2 or the direction of the finger for pressing. You may.

As described above, the first opening 2 is formed in the panel wall 40.
After forming 4, the consumer can drink the beverage by tilting the can 2 with the mouth on the skirt wall 7 and the annular flat portion 11. In this case, the diameter of the first opening 24 serving as the opening for discharging the beverage is 16 mm or more and has a sufficient opening area.
It is taken out smoothly from inside.

Further, according to the above-mentioned opening projecting can lid 1, the skirt wall 7 of the projecting portion 10, which is a portion where the consumer actually contacts the lips, forms a surface that is gently curved toward the axis. Since it is formed so as to follow the curved surface of the lips, consumers can drink the beverage without feeling uncomfortable. Furthermore, the cut surface in the state opened along the first breaking line 19 is
In addition to appearing on the outer peripheral side of the first opening 24, the inner peripheral edge of the first opening 24 has a curved surface, so that the consumer can use his / her thumb (or other finger pressing the pressing unit 29) or lips. There is no danger of cutting.

Further, according to the above-mentioned opening protruding can lid 1, the airtightness of the second breaking line 31 is ensured by covering the overlap portion 50 with the plastisol 30, that is, the panel wall 40 is formed of, for example, three Since the second break line 31 is not formed in the lowermost layer 18 while being folded into a layer, the second break line 31 having a small diameter can be formed easily and reliably, and the productivity is thereby improved. be able to.

Further, according to the above-described canister 1 with the opening protruding, the first breaking line 19 is displaced to the inner peripheral side from the position immediately below the annular flat portion 11, and the can 2 is accidentally dropped. Even if the annular flat portion 11 collides against the ground etc.
The impact force does not directly act on the first breaking line 19, so that it is possible to prevent the first opening piece 20 from being carelessly opened to form the first opening 24. it can.

Further, according to the above-mentioned opening projecting can lid 1, the annular flat portion 11 which is the tip edge of the projecting portion 10 forms a flat surface parallel to a line perpendicular to the central axis, so that a large number of In addition to being superior in the so-called stacking property of maintaining the superposed state, for example, the pressing portion 2 is replaced with a consumer's finger.
An opening temporary sealing plug or the like for pressing the opening 9 and re-sealing the first opening 24 can be mounted without play.

Further, according to the above-described opening projecting can lid 1, the outer peripheral side of the first breaking line 19 is surrounded by the first annular wall 15 having a larger projecting amount and the second breaking line 31.
Is surrounded by the second annular wall 22 having a larger protruding amount on the outer peripheral side of the plastisol 25, 3 while being rotated about the central axis.
0, plastisol 2 by centrifugal force
5 and 30 do not flow outward in the radial direction, and can be reliably provided at the expected position. Accordingly, thick coating becomes possible, so that the desired effect by applying the plastisols 25 and 30 can be obtained.

[0051]

As described above, according to the first aspect of the present invention, an annular projecting portion projecting in the axial direction from the flange portion wound around the open end of the can body is formed,
A panel wall closing a portion away from the leading edge is formed, a first opening piece defined by a first breaking line is provided on the panel wall, and a second opening defined by a second breaking line on an inner peripheral side thereof. An easy-open can lid provided with a piece, a folded portion formed by folding a portion of the panel wall inwardly away from a peripheral edge portion, and a leading edge of a protruding portion of a plurality of layers in the folded portion. Since the first break line is formed on the layer farthest from the first break line, since the first break line is formed shifted from the leading edge of the protrusion to the inner peripheral side, the can body is accidentally dropped,
Even if the tip edge of the protruding portion collides with the ground or the like, the impact force does not directly act on the first breaking line, and therefore, it is possible to prevent an inadvertent opening of the first opening piece. it can.

According to the first aspect of the present invention, the second breaking line cuts the panel wall completely in the thickness direction except for the separated portions at both ends thereof, and the second opening piece. Is polymerized on the surface of the can body side of the first opening piece, and furthermore, the polymerized portion is covered and sealed with a sealant, so that the second break line is exposed on the outer surface of the panel wall, It is not necessary to fold the panel wall into, for example, three layers along the small-diameter second breaking line, so that the molding process can be simplified and the moldability, particularly near the second opening piece, is good. As a result, , The production efficiency can be improved.

According to the second aspect of the present invention, in the configuration according to the first aspect, a plurality of layers in the folded portion are provided on the outer peripheral side of the folded portion on the panel wall in a direction opposite to the projecting portion. A substantially annular recessed portion protruding larger than the layer farthest from the leading edge of the projecting portion is formed, and the second breaking line is located closer to the leading edge of the projecting portion than the first breaking line. Since the outer peripheral portion of each break line on the wall acts as a so-called embankment, it is possible to apply the sealant thickly in the process of applying the sealant while rotating around the central axis, and the internal pressure change of the can , The breakage of the first break line and the second break line can be reliably prevented, and corrosion of the can lid due to intrusion of the contents into each break line can be prevented.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the opening diameter of the first opening is set to 16 mm or more,
In addition to the fact that the opening diameter of the second opening is set to a diameter of 12 mm or less, the opening for taking out the contents is easy to pour a beverage or the like and the required lid opening force has a small size. Since the size of the gas vent opening is easily opened and the finger of the consumer is difficult to enter, the practicality can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a specific example of the present invention.

FIG. 2 is a schematic diagram showing an opening projecting can lid viewed from a pressing portion side.

FIG. 3 is a cross-sectional view showing the vicinity of a first break line and a second break line.

[Explanation of symbols]

1 ... Canister with projecting opening, 2 ... Can body, 3 ... Can body, 4 ...
Open end, 7: Skirt wall, 10: Projection, 11
... annular flat part, 13 ... hollow part, 14 ... folding part,
15: first annular wall, 16: uppermost layer, 18: lowermost layer,
19: first breaking line, 20: first opening piece, 22: second annular wall, 24: first opening part, 25, 30 ... plastisol, 26: second opening piece, 29 ... pressing part, 31
... Second break line, 32 ... Second opening, 40 ... Panel wall, 50 ... Overlap part.

Claims (3)

[Claims] 1. A can lid provided on an outer peripheral portion with a flange portion wound and fixed to an open end of a cylindrical can body, which protrudes outward from the flange portion in the axial direction. An annular projection is formed, and a panel wall is formed in a state in which the opening of the projection is closed at a portion axially away from the leading edge of the projection, and the panel wall has a curved line with both ends separated. A first opening piece having a substantially circular shape and defined by a first breaking line broken by a pressing force is provided, and a sealant is applied so as to cover the first breaking line. An easily openable can lid provided with a substantially circular second opening piece formed on the inner peripheral side of the opening piece and having a curved shape separated from both ends and separated by a second breaking line broken by the pressing force, The part of the panel wall away from the periphery Together with tatami portion folding comprising folding at least in triplicate is formed, the first breaking line is formed on the layer most distant from the front end edge of the protruding portion of the plurality of layers in the folded portion,
Further, the second breaking line completely cuts the panel wall in its thickness direction except for a part separated at both ends thereof, and the second opening piece is the can body side of the first opening piece. Wherein the polymerized portion is covered with a sealant and the polymerized portion is sealed off. 2. A plurality of layers in the folded portion on the outer peripheral side of the folded portion on the panel wall in a direction opposite to the projected portion, which are larger than a layer farthest from a leading edge of the projected portion. 2. The easy opening according to claim 1, wherein a projecting substantially annular concave portion is formed, and the second break line is located closer to a front edge of the protrusion than the first break line. Can lid. 3. An opening diameter of the first opening that appears when the first opening piece is pressed down is set to a diameter of 16 mm or more, and an opening diameter of the second opening that appears when the second opening piece is pressed down is set. The easy opening can lid according to claim 1 or 2, wherein the diameter is set to 12 mm or less.