JP3908417B2 - Can with temporary sealing stopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a can with an opening temporary sealing stopper that can be easily opened and has a shape in which a beverage or the like enclosed in a can body can be easily taken or poured out.
[0002]
[Prior art]
As an easy open can, there is known a type of can in which an opening piece defined on a can lid is pressed by a score line and the opening piece is broken along the score line. As these cans, there are, for example, those described in JP-A-8-169454 and those described in US Pat. No. 4,976,368.
[0003]
In the invention described in Japanese Patent Laid-Open No. 8-169454, the skirt or apron extends from the annular transition portion of the lid member in the direction away from the container body and approaches the central axis, and the head is attached to the tip. The top is formed through. A concave push-down tab surrounded by a score line is formed on the top side of the top. When opening the can lid, press the concave push-down tab with your finger to break the score line and push the concave push-down tab down into the container body to bring the opening piece into a suspended state. Open.
[0004]
In the invention described in US Pat. No. 4,976,368, an outer peripheral wall projecting upward from a can lid, a flat annular panel extending inwardly from the outer peripheral wall, and an inner peripheral wall hanging downward from the annular panel. The lower end of the inner peripheral wall is folded into a triple layer, and an opening piece is defined by a score line formed in the lowermost layer. A convex tab is formed on the opening piece, and when the can lid is opened, the convex tab is pushed down with a finger to break the opening piece at the score line, and the opening piece is formed on the inner surface side of the can lid. Open the can lid in the suspended state.
[0005]
[Problems to be solved by the invention]
In the above-mentioned two inventions, the opening piece is pushed down directly with the finger and the opening piece is pushed down into the can body while breaking the score line portion to open the can lid, so that the beverage or the like enclosed in the can body adheres to the finger. there is a possibility. In particular, in the case of a carbonated beverage, since the beverage may squirt when the lid is opened, there is a high possibility that the beverage will adhere to the finger. Also, when opening the lid, there is a possibility of the finger being damaged by the edge of the opening piece, and it is easy to open the can lid with the finger depending on individual differences such as the size and length of the consumer's finger and the size of the pressing force It may happen that this is not the case. It is also possible to engrave the score line deeply over the entire circumference so that the can lid can be opened even with a small pressing force.
[0006]
However, due to the impact received during transportation of the can body, the score line may break, and when the internal pressure becomes high, the score line may break and the enclosed beverage may spout. The score line cannot be deepened over a wide area. In addition, when the can lid is opened, the opening piece that has sealed the opening is pushed down into the can body, so that it cannot be temporarily sealed by the lid like a so-called PET bottle. It is the same as an open can.
[0007]
The present invention has been made against the background of the above circumstances. The can lid can be easily opened, the opened can lid can be temporarily sealed, and the product quality is high and the productivity is improved. An object of the present invention is to provide an excellent can with an opening temporary sealing stopper.
[0008]
[Means for Solving the Problem and Action]
In order to achieve the above-mentioned object, the invention of claim 1 is a can lid provided with a flange portion, which is fastened to the opening end of the can body, on the outer peripheral portion, and is more axial than the flange portion. An annular projecting portion projecting outward is formed, and the projecting portion has a curved shape in which both ends are separated from each other, and a substantially circular opening piece defined by an easily breakable line that is broken by a pressing force. The provided can lid is fastened and fixed to the opening end of the can body by the flange portion, and the opening temporary sealing plug covers the opening piece and the outer peripheral edge of the protruding portion with respect to the protruding portion. In the can with an opening temporary sealing stopper, the peripheral edge portion of the front end surface of the projecting portion is formed on a flat surface over a predetermined width, and on the inner peripheral side of the peripheral edge portion forming the flat surface. The depression is formed in a direction opposite to the protruding direction of the protruding portion. In addition, a fold portion formed by folding at least triple a wall surface continuous from the dent portion is formed on the inner peripheral side of the dent portion, and the most of the plurality of layers in the fold portion from the front end surface of the protruding portion. The easily breakable line is provided in a separated layer, the opening piece is provided at a position lower than the inner peripheral side of the folded portion and the surface of the peripheral edge portion, and the outer peripheral portion of the protruding portion In addition, the engaging protrusions that extend in the circumferential direction in an inclined posture and that the protrusion amount in the radial direction of the protrusions is set to be substantially constant except for both ends are spaced apart from each other at a predetermined interval in the circumferential direction. A plurality of formed temporary sealing plugs are formed on the first cylindrical portion that can be fitted to the protruding portion so as to cover the engaging protrusions, and an inner peripheral surface of the first cylindrical portion. And a first temporary fixing protrusion that is engageable with the engaging protrusion. A second cylindrical portion that protrudes opposite to the first cylindrical portion in the axial direction and that can be fitted to the protruding portion in a state of covering each engaging protrusion, and an inner circumference of the second cylindrical portion A plurality of second temporary fixing protrusions that are provided on the surface at predetermined intervals in the circumferential direction and that are inclined corresponding to the inclination of the engaging protrusion and engageable with the engaging protrusion. And an opening fitting protrusion that protrudes from the second cylindrical portion in the same axial direction as the second cylindrical portion on the inner peripheral side of the second cylindrical portion, and presses the opening piece to break the easy break line. Is provided between the opening fitting convex portion and the second cylindrical portion, and protrudes smaller than the opening fitting convex portion and larger than the second cylindrical portion. The outer peripheral surface has a tapered cylindrical shape whose diameter is reduced toward the distal end, and the outer diameter of the base end is set larger than the inner diameter of the opening formed after breaking the easily breakable line. Before With the second temporary fixing protrusion engaged with the engaging protrusion, the front Opening Hold tightly along the inner periphery of the mouth and hold down the opening piece An elastically deformable ring And a protruding portion.
[0009]
Therefore, according to the first aspect of the present invention, the temporary opening stopper plug is attached to the can lid so that the first temporary fixing protrusion of the first cylindrical portion engages with the engaging protrusion of the can lid. Can transport and sell cans. Moreover, by removing the opening temporary sealing plug from the opening protruding can lid and inverting it and pressing the opening piece by the opening fitting convex portion, the easily breakable line is broken and the separated portions at both ends are hinged. The opening piece is pushed down to form an opening, and as a result, the lid is opened. In that case, the opening piece is provided on the outer peripheral side of the opening fitting convex portion and the opening piece comes into contact with the tip of the annular protruding portion whose protruding amount is smaller than that of the opening fitting convex portion. There is no. Moreover, since the opening fitting convex part protrudes larger than the 2nd cylindrical part located in the outer peripheral side, and the position is clear, the position alignment of the opening temporary sealing stopper with respect to an opening part protrusion can lid is easy. . In addition, since the cut end face of the easily breakable line is not exposed to the opening, there is no possibility that the consumer will hurt the finger.
[0010]
Further, after opening the lid, the opening of the can lid can be temporarily sealed with the temporary opening sealing plug. Specifically, the temporary sealing plug is put on the protruding portion in a posture in which the second cylindrical portion and the protruding portion are opposed to each other, and each second temporary portion is rotated around the central axis of the second cylindrical portion. The stop projections are engaged with the respective engagement projections, and the annular projections are in close contact with the inner peripheral edge of the opening. As a result, the temporary opening sealing plug is firmly attached to the projection. In particular, it is a part fitted to the outer periphery of the protruding portion, and the protruding amount of the annular protruding portion is set larger than the protruding amount of the second cylindrical portion that bears a part of the mounting strength as the entire opening temporary sealing plug For this reason, the elastic force of the annular protrusion itself is sufficiently large, so that the sealing performance at the contact portion with the opening is excellent.
[0011]
In addition, by improving the sealing performance in this way, the pressure acting in the direction of removing the temporary opening sealing plug from the can lid is increased, but as described above, the second temporary fixing protrusion and the engaging protrusion are as a whole. Since it is engaged in a spiral shape (screw engagement), the temporary opening sealing plug is securely fixed. That is, it is particularly effective when a beverage having a high internal pressure in the can body is targeted, such as a carbonated beverage. Therefore, it is possible to prevent spilling of the beverage left over or the content liquid left over as in the case where the can body is tilted down, and the temporarily sealed can body can be carried.
[0012]
Further, in the invention of claim 1, each engagement protrusion is not a structure formed by crushing and forming the outer peripheral edge of the tip end surface of the protrusion, but wrinkles and burrs are generated due to a material surplus (slack) or the like. Can be prevented, and molding damage to the can lid material or the protective coating on the surface of the can lid can be reduced. That is, product quality can be improved. In addition, since the peripheral portion of the tip end surface of the protruding portion is a flat surface over the entire circumference, there is an advantage that the appearance is good.
[0013]
Furthermore, according to the invention of claim 1, the peripheral edge of the front end surface of the projecting portion serving as a so-called pedestal part of the temporary opening sealing plug is formed on a flat surface, and the assembly property of the temporary opening sealing plug to the can lid Therefore, it is possible to withstand a large load, and the temporary opening sealing plug is not detached from the can lid or the opening piece is not pushed down carelessly.
[0014]
According to the invention of claim 1, for example, when a carbonated beverage is filled as the contents, the force for inflating the opening piece toward the outside acts by the carbon dioxide gas. Is set lower than the height of the peripheral edge of the protruding portion, and in addition, deformation of the opening piece is suppressed by a recess that is concave in the direction opposite to the direction in which the opening piece bulges. There is no risk of bulging out. Therefore, in the invention of claim 1, it is possible to carry the can in a posture in which the opening projecting can lid side of the can in the state before the temporary opening sealing plug is crowned is directed downward, and in a heated state. It is possible to sterilize the opening protruding can lid by bringing the beverage into direct contact with the inner surface of the opening protruding can lid.
[0015]
According to a second aspect of the present invention, in addition to the first aspect of the invention, the opening piece is adjacent to the easily breakable line and has a substantially annular shape protruding in the same direction as the protruding portion in the axial direction. An annular convex part, and a convex part that is provided at a predetermined interval on the inner peripheral side of the annular convex part and that projects in the same direction as the projecting part in the axial direction. The front end portion of the opening fitting convex portion is provided with a pressing surface having a width that can be inserted into a portion between the annular convex portion and the convex portion.
[0016]
Therefore, according to the invention described in claim 2, when the opening piece is pressed by the opening fitting convex portion, the pressing surface is fitted between the annular convex portion and the convex portion, thereby opening the opening piece. Positioning of the temporary opening sealing plug with respect to the partial projecting can lid is ensured, and accordingly, a pressing load can be favorably applied, so that the opening of the lid becomes easy. In addition, the temporary opening sealing plug and the opening piece are not deformed by positioning the opening temporary sealing stopper and the opening protruding can lid.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific examples of the present invention will be described with reference to the drawings. FIG. 1 shows a specific example of the present invention, in which an opening protruding can lid 30 and an opening temporary sealing plug 31 are shown. First, the opening protrusion can lid 30 will be described. The opening protruding can lid 30 is made of a metal flat plate material (not shown) such as an aluminum alloy. Note that an inner film (not shown) made of synthetic resin is formed in advance on one surface of the flat plate. This inner surface film is formed from a protective paint or a resin film.
[0018]
As the paint, any protective paint made of thermosetting and thermoplastic resin, for example, modified epoxy paint such as phenol-epoxy paint, amino-epoxy paint, vinyl chloride-vinyl acetate copolymer, epoxy-phenol modified vinyl paint These are used alone or in combination of two or more, such as vinyl or modified vinyl paint. As the resin film, a polyester resin based on ethylene-terephthalate, such as polyethylene terephthalate (PET), and further a copolymer such as polyethylene terephthalate-isophthalate (PET / I) can be used. When a resin film is used for the inner surface coating, the resin film may be unstretched or biaxially stretched.
[0019]
On the outer peripheral side of the opening protruding can lid 30, a well-known flange portion (not shown) is formed which is fastened and fixed to the opening of the cylindrical can body 32 to form the winding portion 33. An annular groove 34 having a U-shape that is recessed substantially downward in FIG. 1 is formed on the radially inner side of the opening projecting can lid 30 from the tightening portion 33.
[0020]
A skirt wall 35 is formed from the annular groove 34 toward the central axis of the can body 32 and extending upward in FIG. The skirt wall 35 extends in an arc so that its cross section protrudes in the axial direction of the can body 32. Further, a ridge 36 is formed following the upper end of the skirt wall 35 in FIG. Further, an upper neck portion of the raised portion 36 in FIG. 1 is formed with a mouth and neck portion 37 having a side wall surface formed substantially parallel to the central axis of the can body. That is, the mouth-and-neck portion 37 itself has a cylindrical shape with a constant outer diameter in the length direction. Further, on the side surface of the mouth-and-neck portion 37, three engaging projections 38 projecting outward in the radial direction are formed at equal intervals in the circumferential direction.
[0021]
More specifically, the engagement protrusion 38 is a linear protrusion inclined from the upper left side to the lower right side in FIG. 1, and the protruding amount in the radial direction is constant except for both ends. It has become. In other words, the intermediate portion in the length direction of the engaging protrusion 38 is curved so as to be substantially parallel to the side surface of the mouth-and-neck portion 37, whereas both ends of the engaging protrusion 38 are in the mouth-and-neck. The skirt spreads out so as to obliquely intersect the side surface of the portion 37. A protruding portion 70 is formed by the mouth and neck portion 37, the skirt wall 35, and the raised portion 36.
[0022]
On the other hand, the wall surface connected to the upper edge portion of the mouth and neck portion 37 is bent toward the inner peripheral side. That is, a surface that closes the upper edge portion of the mouth-and-neck portion 37 is provided, and the surface is a flat surface that is substantially orthogonal to the central axis of the can body 32. This portion is formed as an annular flat portion 10. Accordingly, the annular flat portion 10 corresponds to the peripheral edge portion of the tip surface of the protruding portion of the present invention.
[0023]
Further, the wall surface connected from the inner edge of the annular flat portion 10 is bent downward in FIG. 1 substantially parallel to the central axis of the can body 32, and this is formed as the inner peripheral wall 11. That is, the inner peripheral wall 11 is a wall surface having an annular shape as a whole provided on the inner peripheral side of the mouth and neck portion 37. Further, a recess 12 whose cross section is curved in an arc shape downward in FIG. 1 is formed at the lower edge of the inner peripheral wall 11. This hollow part 12 is formed over the whole circumferential direction, and has comprised the cyclic | annular form as a whole.
[0024]
Further, the wall surface on the inner peripheral side of the hollow portion 12 slightly protrudes upward in FIG. 1 in the axial direction, and is folded into a triple layer so as to form a circular shape as a whole, and this is formed as a folding portion 39. Has been. The uppermost layer 40 in FIG. 1 of the folding portion 39 forms a flat surface and is parallel to a line orthogonal to the central axis of the opening protruding can lid 30. The distance between the uppermost layer 40 and the bottom of the recess 12 in the direction along the central axis of the can body 32 is set to about 0.50 to 0.60 mm as an example. Note that the inner diameter of the folding portion 39 corresponds to the inner diameter of the opening 41 that appears in a state where an opening piece 44 described later is pushed down.
[0025]
A score line 43 is formed on the lowermost layer 42 of the folding portion 39 except for a part thereof. In other words, the score line 43 is formed along the folding portion 39 (folding portion 39). Are formed outside the inner peripheral side front end portion or the inner peripheral side bent portion), and the both end portions are separated from each other. In addition, in order to improve lid opening property, you may cut | disconnect a part of score line 43 completely. Here, the arrangement of the engagement protrusions 38 in the circumferential direction of the protrusion 70 is an arrangement that avoids a position facing the portion between the ends of the score line 43 in the circumferential direction.
[0026]
On the other hand, an opening piece 44 is formed on the inner peripheral side of the score line 43. The opening piece 44 is made of a wall surface that is integrally connected to the lowermost layer 42 in the folding portion 39, and has a substantially circular shape defined by the score line 43. Therefore, the opening piece 44 has a structure that can be pushed down to the inside of the protruding portion 70 by using a portion between the ends of the score line 43 as a hinge. Further, a plastisol 45 is applied to a portion adjacent to the score line 43 in the opening piece 44 and the uppermost layer 40 of the folding portion 39.
[0027]
The plastisol 45 prevents the score line 43 from breaking due to a change in the internal pressure of the can body, repairs damage to the coating film due to the formation of the score line 43, and prevents the opening protruding can lid 30 from entering the beverage. This is to prevent corrosion. By applying the plastisol 45, leakage of the content liquid can be prevented even if a part of the score line 43 is completely cut. The score line 43 corresponds to the easy break line of the present invention.
[0028]
Further, an annular convex portion 46 protruding upward in FIG. 1 is formed on the inner peripheral side of the opening piece 44 with respect to the folding portion 39. Specifically, the annular convex portion 46 includes an outer peripheral slope portion 47 inclined upward in FIG. 1 from the inner peripheral side of the folding portion 39 toward the central axis, and a peripheral portion (upper portion) of the outer peripheral slope portion 47. A flat top surface portion 48 that is continuous with the upper edge layer 40 and 0.10 to 0.20 mm below the uppermost layer 40 of the folding portion 39, and the top surface portion 48 is continuous with the inner peripheral edge portion. And an inner peripheral inclined surface portion 49 inclined downward in FIG.
[0029]
Furthermore, an opening fitting recess 50 is formed on the inner peripheral side of the annular protrusion 46 in the opening piece 44. More specifically, the opening fitting recess 50 is a flat groove or valley section defined by the inner peripheral slope portion 49 of the annular convex portion 46 and the slope of the convex portion 51 provided on the inner peripheral side thereof. The dimensions and the shape are substantially the same as those of a pressing surface 64 described later in the temporary opening sealing plug 31. That is, the interval between the lower edge portion of the inner peripheral slope portion 49 in FIG. 1 and the lower edge portion of the convex portion 51 coincides with the interval between the inner peripheral edge and the outer peripheral edge of the pressing surface 64.
[0030]
Further, the opening fitting recess 50 is provided in parallel with a line orthogonal to the central axis of the can body and at the same height as the lowermost layer 42 of the folding part 39. The central axis of the opening fitting recess 50 is arranged coaxially with the central axis of the opening protruding can lid 30. In addition, the uppermost surface in FIG. 1 of the convex portion 51 formed on the inner peripheral side of the opening fitting concave portion 50 in the opening piece 44 forms a flat surface, and is lower than the uppermost layer 40 of the folding portion 39. .30 ~. It is provided at a position 40 mm above. The position of the uppermost surface of the convex portion 51 is preferably a position that does not protrude above the protruding portion 70 from the viewpoint of preventing an unintended pressing force from being applied to the opening piece 44, and can be stacked at the time of manufacture. In consideration of saving of materials used, opening operability, etc., it is set below 1.10 to 1.20 mm of the annular flat portion 10.
[0031]
Next, the temporary opening sealing plug 31 will be described. As shown in FIG. 1, the opening temporary sealing plug 31 formed of a synthetic resin such as polyethylene resin or polypropylene resin has a first cylindrical portion 52 extending downward in FIG. ing. On the inner surface of the lower end of the first cylindrical portion 52, six first temporary fixing projections 53 protruding inward in the radial direction are formed at equal intervals in the circumferential direction. Each first temporary fixing protrusion 53 is a linear protrusion, and has a posture orthogonal to the central axis of the first cylindrical portion 52. The first temporary fixing projection 53 is elastically deformed and climbs over the engaging projection 38 of the opening protruding can lid 30 and comes into close contact with the lower neck portion 37 so that the temporary opening sealing plug 31 is opened. It is detachably fixed to the partial protrusion can lid 30.
[0032]
A second cylindrical portion 54 is formed integrally with the upper side of the first cylindrical portion 52 in FIG. The second cylindrical portion 54 has a cylindrical shape having the same diameter and substantially the same length as the first cylindrical portion 52, and is disposed coaxially with the first cylindrical portion 52. Three second temporary fixing projections 55 are provided on the inner surface of the second cylindrical portion 54 at equal intervals in the circumferential direction. The second temporary fixing projection 55 is a trapezoidal ridge that is inclined so as to be parallel to each engaging projection 38 as a whole (from the left side to the right side in FIG. 1).
[0033]
A flat panel portion 56 extends toward the inside in the radial direction of the first cylindrical portion 52 at an intermediate portion on the inner peripheral surface of the second cylindrical portion 54 and the first cylindrical portion 52. The panel portion 56 has a posture orthogonal to the central axis of the first cylindrical portion 52. On the inner peripheral side of the panel portion 56, the third cylindrical portion 13 protruding in the same axial direction as the first cylindrical portion 52 is formed. The wall surface of the third cylindrical portion 13 is parallel to the wall surface of the first cylindrical portion 52.
[0034]
The inner diameter of the third cylindrical portion 13 is set to be slightly larger than that of the annular folding portion 39 in the opening protruding can lid 30. Furthermore, the length of the third cylindrical portion 13 is about １ ／ of the length of the first cylindrical portion 52, which is the annular flat portion 10 in the opening protruding can lid 30 and the uppermost layer 40 of the folding portion 39. It is a little shorter than the interval. That is, when the opening temporary sealing plug 31 is attached to the opening protruding can lid 30 with the first cylindrical portion 52 engaged with the engaging protrusion 38, the lower end portion is the uppermost layer of the folding portion 39. It is the length which contacts 40, without pressing 40 too much.
[0035]
On the other hand, a fourth cylindrical portion 14 is formed on the opposite side of the third cylindrical portion 13 with the panel portion 56 interposed therebetween. That is, the fourth cylindrical portion 14 has a structure protruding in the same axial direction as the second cylindrical portion 54. The inner and outer diameters of the fourth cylindrical portion 14 and the protruding amount (length) from the panel portion 56 are set to be substantially the same as the inner and outer diameters and lengths of the third cylindrical portion 13.
[0036]
An annular projecting portion 57 having an elastically deformable thickness projecting in the same axial direction as the second cylindrical portion 54 is formed at the inner peripheral portion of the fourth cylindrical portion 14. More specifically, the annular projecting portion 57 has a tapered cylindrical shape whose inner peripheral surface is substantially parallel to the second cylindrical portion 54 and whose outer peripheral surface is reduced in diameter toward the distal end portion. The outer diameter of the base end is set larger than the inner diameter of the opening 41 formed in the opening protruding can lid 30. The thickness of the intermediate portion in the length direction from the distal end portion of the annular projecting portion 57 is set to be thinner than the thickness of the opening fitting convex portion 58 or the second cylindrical portion 54. Is set to be substantially the same as the thickness of the opening fitting convex portion 58 or the second cylindrical portion 54.
[0037]
Furthermore, the tip of the annular protrusion 57 is located slightly outside in the axial direction with respect to the end surface of the second cylindrical portion 54. That is, the tip of the annular projecting portion 57 slightly projects (0.45 mm in this example) from the second cylindrical portion 54. In this state, the opening protrusion 41 is inserted into the opening 41 and the second temporary fixing protrusion 55 is engaged with the engagement protrusion 38, and the annular protrusion 57 is opened from the tip to the opening. 41, the base end portion having a diameter larger than the inner diameter of the opening 41 enters, and the outer peripheral surface and the inner peripheral edge of the opening 41 are stopped in a pressure contact state.
[0038]
On the inner peripheral side of the base end portion of the annular projecting portion 57, a cylindrical tapered portion 59 projecting in the same direction as the second cylindrical portion 54 in the axial direction is formed. The taper portion 59 is provided with a taper in a direction of reducing the diameter toward the upper edge portion. Further, a cylindrical vertical portion 60 whose side surface is aligned substantially parallel to the central axis of the opening protruding can lid 30 is formed on the upper edge portion of the tapered portion 59 in FIG. Further, an inclined portion 61 having a taper angle larger than that of the tapered portion 59 is formed at the upper edge portion of the vertical portion 60, and a cylindrical pressing portion 62 having a short length is formed at the upper edge portion of the inclined portion 61. Is formed.
[0039]
An end plate portion 63 parallel to the panel portion 56 is formed at the proximal end portion on the inner peripheral side of the pressing portion 62. That is, the opening portion on the inner peripheral side of the pressing portion 62 is closed by the end plate portion 63. Note that the bottom surface (the lower surface in FIG. 1) of the end plate portion 63 is located slightly outside (in the present example, about 0.7 mm outside) in the axial direction from the second cylindrical portion 54. The taper portion 59, the vertical portion 60, the inclined portion 61, the pressing portion 62, the pressing surface 64, and the end plate portion 63 constitute an opening fitting convex portion 58. Further, the end surface of the pressing portion 62 is formed as a pressing surface 64. The pressing surface 64 is located outside the end surface of the second cylindrical portion 54 in the axial direction. That is, the opening fitting convex portion 58 has a structure protruding 3.0 mm from the end surface of the second cylindrical portion 54. The protruding amount is, for example, the entire length of the opening fitting convex portion 58 (the boundary portion with the taper portion 59). To the pressing surface 64) is set to about 1/2.
[0040]
Next, the operation of the present invention configured as described above will be described. The can body is stored or sold in the state shown in FIG. 1, that is, in a state where the first temporary fixing protrusion 53 of the temporary opening sealing plug 31 is engaged with the engaging protrusion 38 of the opening protruding can lid 30. Is done. In that case, the end surface of the third cylindrical portion 13 is in contact with the portion of the opening protruding can lid 30 that avoids the opening piece 44, and from the first temporary fixing projection 53 in the temporary opening sealing plug 31. Since the portion located on the inner periphery is supported by the third cylindrical portion 13 and the uppermost layer 40 of the folding portion 39, for example, the temporary opening plug 31 is excessively formed even in a pallet stacked state. Therefore, it is possible to prevent the opening projecting can lid 30 from being removed and the opening piece 44 from being pushed down to be opened.
[0041]
In order to prevent the temporary opening sealing plug 31 from falling off the opening protruding can lid 30 and to prevent dust from adhering to or being tampered with during the storefront display, The opening protruding can lid 30 may be shrink-wrapped with a transparent or opaque heat-shrinkable plastic film or the like. The consumer first removes the temporary opening sealing plug 31 from the opening protruding can lid 30 in order to drink the beverage enclosed in the can body. At that time, if they are shrink-wrapped with a plastic film or the like, the film is first removed.
[0042]
Further, the opening temporary sealing plug 31 is held so that the pressing surface 64 faces the opening piece 44 of the opening projecting can lid 30, and then the pressing surface 64 of the opening temporary sealing plug 31 as shown in FIG. Is fitted into the opening fitting recess 50 of the opening protruding can lid 30 and further pressed from that state. In that case, since the opening fitting convex part 58 which is a part which should contact | abut with respect to the opening part protrusion can lid | cover 30 protrudes larger than the 2nd cylindrical part 54, the opening temporary sealing stopper 31 and opening part Positioning with the protruding can lid 30 is easy. In addition, since the opening fitting recess 50 having a shape coinciding with the pressing surface 64 on the surface of the opening piece 44 has a structure including an annular inclined surface on the inner peripheral side and the outer peripheral side as a whole, the temporary opening plug 31 is provided. Can be easily and reliably centered with respect to the opening piece 44 in the opening protruding can lid 30.
[0043]
That is, even if the relative position between the pressing surface 64 and the opening fitting recess 50 is slightly shifted in the radial direction, the inner periphery and the outer periphery of the pressing surface 64 or the pressing portion 62 are opposed to each other with the opening fitting recess 50 interposed therebetween. It is guided to the opening fitting recess 50 so as to slide down along the inner peripheral slope portion 49 of the convex portion 46 and the slope of the convex portion 51, and as a result, the temporary opening sealing plug 31 has the center axis line of the opening piece 44. Positioned in a state aligned with the central axis.
[0044]
Therefore, the pressing load of the opening temporary sealing plug 31 acts favorably on the opening piece 44, so that the opening piece 44 is pushed down to the inside of the opening protruding can lid 30 by using a portion where the score line 43 is not formed as a hinge. Thus, the opening 41 gradually appears. In that case, the opening fitting recess 50 gradually separates from the pressing surface 64 as the opening piece 44 inclines with the opening advances, but the annular protrusion 57 having a smaller protrusion amount than the opening fitting protrusion 58 has an annular protrusion. The opening piece 44 is pushed down as it is in contact with the portion 46. As a result, the opening projecting can lid 30 does not enter a so-called half-open state but opens smoothly until it is almost completely opened. As described above, since the pressing force is generated with the pressing surface 64 positioned, the opening piece 44 and the opening temporary sealing plug 31 are not deformed.
[0045]
By forming the opening 41, the consumer pulls the opening temporary sealing plug 31 fitted in the opening 41 away from the opening protruding can lid 30, and then tilts the can body and flows down through the opening 41. Can drink. In that case, the engagement protrusion 38 is not formed in the part where the consumer actually contacts the lower lip in the outer peripheral part of the tip of the projecting part 70, that is, the part facing the hinge in the circumferential direction. Therefore, consumers can drink beverages without feeling uncomfortable. Moreover, since the cut surface in the state opened along the score line 43 appears on the outer peripheral side with respect to the opening 41, and the inner periphery of the opening 41 forms a curved surface, the consumer cuts the finger and lips. There is no fear.
[0046]
On the other hand, the consumer can use the temporary opening sealing plug 31 to temporarily seal the opening 41 of the opening protruding can lid 30. In this case, the temporary opening stopper 31 is held in a posture in which the opening fitting convex portion 58 is opposed to the opening 41 and is annular with respect to the inner peripheral portion of the opening 41 of the opening protruding can lid 30. Protrusion The temporary sealing plug 31 is pushed into the opening 41 until 57 comes into contact with each other, and is further rotated around the central axis until the panel portion 56 comes into contact with the annular flat part 10 of the opening protruding can lid 30. The second temporary fixing protrusions 55 are engaged with the engaging protrusions 38, respectively.
[0047]
Then, the annular protrusion 57 whose outer peripheral surface is a tapered surface and whose diameter at the front end is smaller than the diameter of the opening 41 enters the inside of the opening 41, and the annular protrusion 57 The outer peripheral surface of the base end part of the opening 41 is elastically adhered (pressure contact) over the entire circumference of the inner edge of the opening 41. In addition, the temporary opening sealing plug 31 is fitted in a space on the inner peripheral side of the annular protrusion 57 in the opening 41. The length in which the annular projecting portion 57 projects downward in FIG. 4 from the end surface of the second cylindrical portion 54 in a state where each second temporary fixing projection 55 is engaged with each engaging projection 38. Since the elastic force of itself is high, it has excellent adhesion to the inner peripheral edge of the folded portion 39. As a result, the opening protruding can lid 30 is temporarily sealed in a state of being sealed by the opening temporary sealing plug 31.
[0048]
In particular, since the second temporary fixing protrusion 55 and the engaging protrusion 38 function as screws, the opening temporary sealing plug 31 can be used as an opening protruding can lid even for a carbonate-containing beverage having a high can internal pressure. 30 can be firmly fixed. Further, the flat end surface of the fourth cylindrical portion 14 is in close contact with the flat uppermost layer 40 of the folding portion 39 in the circumferential direction, and the flat panel portion 56 is circumferential with respect to the annular flat portion 10. Since they are in close contact with each other in the direction, there is no possibility of so-called rattling in the attached state of the temporary opening sealing plug 31.
[0049]
By the way, in this kind of can, when the carbonated beverage is filled as the contents, the force to inflate the opening piece 44 of the opening protruding can lid 30 outwardly acts by the carbon dioxide gas. However, in the can body having the above structure, the convex portion 51 that protrudes the largest in the direction along the central axis of the opening protruding can lid 30 among the opening pieces 44 is lower than the annular flat portion 10 by about 1.10 to 1.20 mm. In addition to being provided at the position, deformation of the opening piece 44 is suppressed by the recessed portion 12 that is recessed in the direction opposite to the direction in which the opening piece 44 swells, so that the opening piece 44 exceeds the annular flat portion 10. It is possible to prevent bulging outward. Accordingly, the can body having the above structure can be transported without any inconvenience in an inverted position (position in which the opening protruding can lid 30 is directed downward), and the heated beverage can be opened in the opening protruding can. There is also an advantage that the opening protruding can lid 30 can be sterilized by directly contacting the inner surface of the lid 30.
[0050]
Further, according to the temporary opening sealing plug 31 of the above specific example, since the opening fitting convex portion 58 has a structure protruding from the opening end of the second cylindrical portion 54, it is easy to distinguish the front and back of the temporary opening sealing plug 31. It is easy to determine the vertical position before placing the temporary opening sealing plug 31 on the opening protruding can lid 30 by machine or manual operation. Workability at the time of being worn on the top is improved.
[0051]
In the above specific example, the score line is given as the easily breakable line. However, the easily breakable line is easily broken when the opening piece is pressed by the temporary opening sealing plug, and the can is transported and stored. It is sufficient if it does not cause leakage of the content liquid at times, and for example, the cutting line penetrating in the thickness direction of the wall surface of the opening protruding can lid is sealed with a sealing material such as plastisol or an adhesive, and reinforced It may be what you did.
[0052]
【The invention's effect】
As described above, according to the invention described in claim 1, the peripheral edge portion of the front end surface of the protruding portion forms a flat surface, and the inner peripheral side of the peripheral edge portion is in the direction opposite to the protruding direction of the protruding portion. A concave recess is formed, and at least a triple fold is formed on the inner peripheral side of the recess, and an easily breakable line is provided in the lowermost layer of the fold, When the opening piece is provided at a position lower than the height of the surface, for example, when the beverage containing a carbon dioxide gas is filled, it is possible to reliably prevent the opening piece from expanding and protruding from the front end surface of the protruding portion. . Further, since the cut end face of the easily breakable line is not exposed from the inner peripheral edge of the opening, there is an advantage that the consumer does not cut the finger or lips.
[0053]
Further, according to the first aspect of the present invention, the opening fitting convex portion that protrudes from the second cylindrical portion in the same axial direction as the second cylindrical portion on the inner peripheral side of the second cylindrical portion, and the opening fitting convex portion In a state of being smaller than the opening fitting convex part and projecting from the second cylindrical part and engaging the second temporary fixing projection part with the engaging projection part. Since the opening temporary sealing stopper is provided with an annular protrusion that closely adheres along the inner peripheral edge of the opening and holds the opening piece pressed down, and the position of the opening fitting convex is clear, It is possible to easily align the opening projecting can lid and the opening temporary sealing stopper. In addition, since the elastic force of the annular protrusion itself is large, there is an advantage that the sealing performance is excellent particularly in the contact portion with the opening.
[0054]
In the invention of claim 2, the opening piece is provided with an annular protrusion protruding in the same direction as the protrusion, and a protrusion provided on the inner peripheral side thereof and protruding in the same direction as the protrusion. In addition, since the front end portion of the opening fitting convex portion is provided with a pressing surface having a width that can be inserted between the annular convex portion and the convex portion, Positioning is ensured, and accordingly, a pressing load can be applied satisfactorily, so that the lid can be opened easily. Further, there is an advantage that deformation of the opening temporary sealing stopper and the opening piece can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a specific example of an opening projecting can lid and an opening temporary sealing stopper of a can with an opening temporary sealing stopper of the present invention.
FIG. 2 is a partial cross-sectional view showing the vicinity of a score line before opening.
FIG. 3 is a cross-sectional view showing a state in which an opening fitting convex portion of an opening temporary sealing plug is brought into contact with an opening piece.
FIG. 4 is a cross-sectional view showing a state where the opening is temporarily sealed with an opening temporary sealing plug after the lid is opened.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Annular flat part, 12 ... Recessed part, 13 ... Third cylindrical part, 14 ... Fourth cylindrical part, 30 ... Opening protruding can lid, 31 ... Temporary opening sealing plug, 32 ... Can barrel, 38 ... Engagement Projection part 39 ... Folding part 40 ... Top layer 41 ... Opening part 42 ... Bottom layer 43 ... Score line 44 ... Opening piece 52 ... First cylindrical part 54 ... Second cylindrical part 55 ... 2nd temporary fix | protruding projection part, 57 ... cyclic | annular protrusion part, 58 ... opening fitting convex part, 70 ... protrusion part.

Claims (2)

A can lid provided with an outer peripheral portion of a flange portion that is fastened and fixed to the opening end of the can body, and an annular projecting portion projecting outward from the flange portion is formed in the axial direction of the can lid. A can lid provided with a substantially circular opening piece that has a curved shape with both ends separated from each other and is divided by an easily breakable line that is broken by a pressing force. In the can with temporary opening sealing plug, which is fastened to the end and further crowned with the opening temporary sealing plug covering the opening piece and the outer periphery of the tip of the protruding portion with respect to the protrusion,
The peripheral edge portion of the front end surface of the protrusion is formed as a flat surface over a predetermined width, and is recessed on the inner peripheral side of the peripheral edge forming the flat surface in a direction opposite to the protrusion direction of the protrusion. And a fold portion formed by folding at least a triple wall surface continuous from the dent portion is formed on the inner peripheral side of the dent portion, and the protrusion of the plurality of layers in the fold portion The easily breakable line is provided in a layer farthest from the front end surface of the part, the opening piece is provided at a position lower than the height of the surface of the peripheral part on the inner peripheral side of the folding part, and On the outer periphery of the protrusion, there is an engagement protrusion that extends in the circumferential direction in an inclined posture, and the protrusion in the protrusion in the radial direction is set to be substantially constant except for both ends. A plurality are formed at predetermined intervals,
The opening temporary sealing plug is formed on a first cylindrical portion that can be fitted to the protruding portion in a state of covering each of the engaging protrusions, and an inner peripheral surface of the first cylindrical portion, and The first temporary fixing projection that can be engaged with the engagement projection and the first cylindrical portion protrude on the opposite side in the axial direction and cover the engagement projection with respect to the projection. And a plurality of second cylindrical portions that can be fitted to each other, and a plurality of inner circumferential surfaces of the second cylindrical portions that are provided at predetermined intervals in the circumferential direction, and that are inclined corresponding to the inclination of the engaging protrusions. And a second temporary fixing projection that can be engaged with the engagement projection, and the second cylindrical portion projects in the same direction in the axial direction as the second cylindrical portion on the inner peripheral side of the second cylindrical portion, And an opening fitting convex portion that presses the opening piece to break the easy break line, and is provided between the opening fitting convex portion and the second cylindrical portion. , Small and large protruding than the second cylindrical portion than the opening fitting protrusion, the outer peripheral surface forms the Tagged cylindrical tapered whose diameter decreases toward the distal end, an outer diameter of the easily in its proximal end is set larger than the inner diameter of the opening formed in the after breaking the break line, the pre-Symbol second temporary fixing protrusion in a state of being engaged with the engaging projections, of the front KiHiraki opening close contact along the periphery, and the opening temporarily sealed with stopper cans, characterized in that the elastically deformable thickness that holds the state of depressing the opening piece and the ring-shaped projection of are provided. The opening piece is adjacent to the easily breakable line and protrudes in the same direction in the axial direction as the protruding portion, and a predetermined interval is provided on the inner peripheral side of the annular protruding portion. And provided with a protrusion protruding in the same direction in the axial direction as the protrusion,
The front end portion of the opening fitting convex portion of the temporary opening sealing plug is provided with a pressing surface having a width that can be inserted into a portion between the annular convex portion and the convex portion. The can with an opening temporary sealing stopper according to claim 1.

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