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WO2021241639A1 - 缶蓋 - Google Patents

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Publication number
WO2021241639A1
WO2021241639A1 PCT/JP2021/020028 JP2021020028W WO2021241639A1 WO 2021241639 A1 WO2021241639 A1 WO 2021241639A1 JP 2021020028 W JP2021020028 W JP 2021020028W WO 2021241639 A1 WO2021241639 A1 WO 2021241639A1
Authority
WO
WIPO (PCT)
Prior art keywords
rivet
straight line
score line
lid
panel
Prior art date
Application number
PCT/JP2021/020028
Other languages
English (en)
French (fr)
Inventor
正博 塩谷
理央 宮下
Original Assignee
大和製罐株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大和製罐株式会社 filed Critical 大和製罐株式会社
Priority to CN202180038357.7A priority Critical patent/CN115697851A/zh
Priority to EP21812650.6A priority patent/EP4159636A4/en
Priority to AU2021281838A priority patent/AU2021281838A1/en
Publication of WO2021241639A1 publication Critical patent/WO2021241639A1/ja
Priority to US18/057,966 priority patent/US20230082001A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/40—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness extending circumferentially of the container mouth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/34—Arrangement or construction of pull or lift tabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/34—Arrangement or construction of pull or lift tabs
    • B65D17/347—Arrangement or construction of pull or lift tabs characterised by the connection between the tab and a detachable member or portion of the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/34—Arrangement or construction of pull or lift tabs
    • B65D17/347—Arrangement or construction of pull or lift tabs characterised by the connection between the tab and a detachable member or portion of the container
    • B65D17/353—Arrangement or construction of pull or lift tabs characterised by the connection between the tab and a detachable member or portion of the container the connecting means being integral with the tab or with the detachable member or portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • B65D17/4011—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening completely by means of a tearing tab
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2203/00—Decoration means, markings, information elements, contents indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0016—Action for opening container pivot tab, push-down and pull-out tear panel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0059—General cross-sectional shape of container end panel
    • B65D2517/0061—U-shaped
    • B65D2517/0062—U-shaped and provided with an additional U-shaped peripheral channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0074—Local recess in container end panel
    • B65D2517/0079—Local recess in container end panel located beneath tab hand grip to facilitate initial lifting

Definitions

  • the present invention relates to a can lid used for a can.
  • fully open type can lids which are fully open, are often used as can lids used for canning for food.
  • the final product is formed by filling the can with the contents and then performing a retort treatment, and the internal pressure of the can becomes a negative pressure.
  • a fully open type can lid can be used. Proposed.
  • Such a can lid is formed on the peripheral side of the panel portion and has an annular score line for partitioning the opening piece and an auxiliary score line formed around the rivet portion for attaching a tab for opening.
  • This auxiliary score line uses the tip of the tab as a fulcrum, the finger hook of the tab as the emphasis point, and the rivet part when the tab is lifted by hooking the finger on the finger hook of the tab in the initial stage of the tab opening operation. It breaks due to the second kind of rivet action as the point of action.
  • auxiliary score line By breaking this auxiliary score line, the panel part around the rivet part is easily deformed, and the finger hook part of the tab is easily lifted.
  • the tab is further lifted from the state where the auxiliary score line is broken, the rivet is used as a fulcrum, the finger rest of the tab is used as the point of effort, and the tip of the tab is used as the point of action.
  • the annular score line near the tip breaks. After that, as the finger hook portion of the tab is pulled upward, the annular score line is broken in the circumferential direction, and the opening piece is removed from the can lid.
  • the central part of the can lid swells like a dome due to the internal pressure of the container, and the tip of the tab is located on an inclined surface that inclines downward toward the outer peripheral side. There is a risk that the tip of the can will be displaced toward the outer periphery of the can lid and proper opening operation will not be performed.
  • an object of the present invention is to provide a can lid having sufficient openness even when used for a positive pressure can.
  • the can lid is provided on the disk-shaped panel portion, the score line provided on the outer peripheral edge side of the panel portion, and the inside of the panel portion in the radial direction of the score line.
  • a rivet portion adjacent to the rivet portion a mounting portion having a rivet hole attached to the rivet portion, a tip portion continuous with the mounting portion, and a finger hook portion formed on the opposite side of the tip portion across the mounting portion.
  • a tab having a when the straight line passing through the center of the rivet portion and the tip of the tab is defined as the first straight line, and the straight line passing through the center of the rivet portion and orthogonal to the first straight line is defined as the second straight line, the second straight line is defined. It is provided with an auxiliary score line extending in a direction along the line and having a second portion located on the center side of the panel portion with respect to the second straight line.
  • FIG. 1 is a plan view showing the configuration of a can lid according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing the configuration of the can lid.
  • FIG. 3 is a cross-sectional view showing a configuration of a main part of the can lid.
  • FIG. 4 is a cross-sectional view showing the configuration of the panel portion used for the can lid.
  • FIG. 5 is a cross-sectional view showing a configuration of a main part of a can in which the can lid is used and showing an example in which the can lid expands due to internal pressure.
  • FIG. 6 is a cross-sectional view showing an example of a state when the tab is opened in an example in which the can lid expands due to internal pressure.
  • FIG. 1 is a plan view showing the configuration of the can lid 1 according to the embodiment of the present invention
  • FIG. 2 is a cross-sectional view showing the configuration of the can lid 1.
  • FIG. 3 is a cross-sectional view showing the configuration around the rivet portion 32 of the can lid 1
  • FIG. 4 is a cross-sectional view showing the configuration of the auxiliary score line 33 provided on the panel portion 21.
  • 5 and 6 are cross-sectional views showing the configuration of the can 100 in which the can lid 1 is used, and the panel portion 21 of the can lid 1 is in a dome-shaped bulging state. Note that FIG. 5 shows the configuration before the opening operation by the tab 12, and FIG. 6 shows the configuration at the time of the opening operation by the tab 12.
  • the can lid 1 is, for example, a so-called fully open type with a fully open surface.
  • the can lid 1 discharges the contents of the can 100 containing beverages such as retort foods, carbonated drinks and alcoholic drinks as contents from the inside of the can 100 to the outside. It is a member constituting the opening for the purpose.
  • the can lid 1 is integrally assembled with the can body 101 of the can 100 by winding. As a result, in the can 100, the can lid 1 and the can body 101 are airtightly fixed by the winding portion 100a.
  • the can 100 is, for example, a positive pressure can having a positive pressure inside.
  • the can 100 may be a two-piece can or a three-piece can.
  • the contents are not limited to foods and beverages, and may be other than foods and drinks. That is, various contents enclosed in the can 100 can be applied.
  • the can lid 1 includes a can lid main body 11 and a tab (can lid tab) 12.
  • the can lid 1 is manufactured by pressing a metal plate to mold the can lid main body 11 and the tab 12 in a separate process, and then fixing the tab 12 to the panel portion 21.
  • the metal plate for forming the can lid main body 11 include an aluminum alloy plate having a resin film formed on its surface, a surface-treated steel plate, and the like.
  • the metal plate for forming the tab 12 include an aluminum alloy plate and the like.
  • the can lid main body 11 has a panel portion 21, an annular groove portion 22 provided on the outer peripheral edge of the panel portion 21, and an outer peripheral edge of the annular groove portion 22.
  • the flange portion 23 provided in the above is provided.
  • the panel portion 21 is configured in a disk shape.
  • the panel portion 21 includes a score line 31, a rivet portion 32, an auxiliary score line 33, a protection portion 34, and a finger insertion recess 35.
  • the panel unit 21 may have a display unit 36 or the like in Braille or the like for displaying the contents of the can 100.
  • the panel portion 21 may have convex portions or concave portions for product identification, design, reinforcement, and the like.
  • the score line 31 is broken by the opening operation of the tab 12.
  • the score line 31 is broken to form an opening of the can lid 1 in the panel portion 21.
  • the score line 31 surrounds a region that becomes an opening piece when the opening of the can lid 1 is formed. Since the can lid 1 in the present embodiment is a fully open type, the score line 31 is formed in a circular shape or a substantially circular shape, for example, as shown in FIG. Then, when the score line 31 is broken, as shown in FIG. 6, the score line 31 of the panel portion 21 is formed by using the portion inward in the radial direction of the score line 31 of the panel portion 21 as an opening piece together with the rivet portion 32. It can be removed from the outer part in the radial direction.
  • the score line 31 is a groove forming a fragile portion that breaks a part of the panel portion 21 in the shape of an opening by an external force. As shown in FIG. 3, the score line 31 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21, and a part of the panel portion 21 is formed thinly by the score line 31.
  • the outer surface of the panel portion 21 is a main surface exposed to the outside when the can lid 1 is provided on the can body 101 of the can 100, that is, a surface constituting the upper surface of the can 100.
  • the score line 31 is arranged in the protection unit 34, for example.
  • the score line 31 is not limited to a circular shape.
  • the score line 31 is formed in an arc shape that is partially intermittent, and most of the panel portion 21 is opened, and the opened opening piece is continuous with the panel portion 21. It may be configured to be used.
  • the rivet portion 32 is provided on one main surface of the panel portion 21, specifically, on the outer surface of the panel portion 21.
  • the rivet portion 32 is provided on the outer peripheral edge side of the panel portion 21 and on the central side of the score line 31. That is, the rivet portion 32 is provided adjacent to the score line 31 inward in the radial direction of the score line 31.
  • the rivet portion 32 is configured in a columnar shape protruding from one main surface of the panel portion 21.
  • the rivet portion 32 is formed by drawing a part of the panel portion 21 into a cylindrical shape. Further, the rivet portion 32 fixes the tab 12 to the panel portion 21 by caulking after arranging the tab 12. In addition, in FIGS. 1 to 3, FIG. 5 and FIG. 6, the rivet portion 32 shows a state after caulking.
  • the auxiliary score line 33 is formed in the vicinity of the rivet portion 32 of the panel portion 21.
  • the auxiliary score line 33 is partially broken when the tab 12 is opened.
  • the auxiliary score line 33 includes, for example, a main score line 41 and a sub score line 42 parallel to the main score line 41 provided on the opposite side of the main score line 41 from the rivet portion 32.
  • the main score line 41 is a groove constituting a fragile portion that breaks a part of the panel portion 21 in the shape of an opening by an external force.
  • the main score line 41 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. A part of the panel portion 21 is formed thinly by the main score line 41. As shown in FIG. 6, the main score line 41 breaks during the opening operation of the tab 12 to enable the rivet portion 32 to move upward.
  • the main score line 41 is a pair of a first site 41a, a pair of second sites 41b continuous with the first site 41a, and a pair of third sites continuous with each of the pair of second sites 41b. 41c and.
  • the main score line 41 is continuous with a first site 41a, a pair of second sites 41b, and a pair of third sites 41c.
  • the first portion 41a extends inward in the radial direction of the panel portion 21 of the rivet portion 32 in an arc shape along the rivet portion 32.
  • the straight line passing through the center of the rivet portion 32 and the tip of the tab 12 is defined as the first straight line X
  • the straight line passing through the center of the rivet portion 32 and orthogonal to the first straight line X is defined as the second straight line Y.
  • the second part 41b is continuous with the first part 41a and extends in the direction along the second straight line Y, respectively.
  • the second portion 41b is formed, for example, linearly.
  • the continuous portions of the first portion 41a and the second portion 41b are formed, for example, in an arc shape having a predetermined radius of curvature.
  • the second portion 41b is arranged inward in the radial direction of the can lid 1 with respect to the second straight line Y.
  • the distance between the second portion 41b and the second straight line Y in the first straight line X direction is in the range of 0.2 to 2.0 mm.
  • each of the third portion 41c is continuous with the second portion 41b and bends in a direction away from the second straight line Y.
  • the third portion 41c is formed, for example, in the shape of a plurality of arcs having different radii of curvature having a center of curvature inward in the radial direction of the can lid 1 with respect to the second straight line Y.
  • the third portion 41c is arranged inward in the radial direction of the can lid 1 with respect to the second straight line Y.
  • the sub-score line 42 is provided inward in the radial direction of the panel portion 21 with respect to the second straight line Y of the main score line 41.
  • the sub-score line 42 is formed parallel to the main score line 41.
  • the sub-score line 42 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21.
  • the sub-score line 42 is formed to be shallower than the depth of the main score line 41. That is, the thickness of the portion of the panel portion 21 where the sub-score line 42 is provided is formed to be thicker than the thickness of the portion of the panel portion 21 where the main score line 41 is provided. A part of the panel portion 21 is formed thinly by the sub-score line 42.
  • the protective portion 34 is formed by folding back the panel portion 21 in an annular shape.
  • the protective portion 34 is formed, for example, by being bent inward in the radial direction from the outer peripheral edge of the panel portion 21 and being folded back four times in the radial direction from the rivet portion 32. That is, the protective portion 34 is formed by arranging the panel portions 21 in five layers.
  • the score line 31 is formed on the third layer of the panel portion 21 which is the protection portion 34.
  • the protection unit 34 operates the tab 12 to open, and when the score line 31 breaks, the protection unit 34 has an outer protection unit 34a that protects the inner peripheral edge of the portion existing in the can body 101 of the panel unit 21 that has broken at the score line 31 and the score. It constitutes an inner protective portion 34b that protects the outer peripheral edge of a portion (opening piece) of the panel portion 21 broken by the wire 31 from the can body 101.
  • the outer protective portion 34a is composed of a three-layer panel portion 21 and exists on the inner peripheral edge of the panel portion 21 in which the folded portion is open.
  • the inner protective portion 34b is composed of a three-layer panel portion 21, and the folded portion is located on the outer peripheral edge of the portion away from the opening of the panel portion 21.
  • the protective portion 34 includes the upper layer 34c formed by the folded first and second layer panel portions 21 located on the outer surface side of the can lid 1 and the can lid 1.
  • the lower layer 34d formed by the folded fourth and fifth layer panel portions 21 located on the inner surface side of the above, and the folded third layer panel portion located between the upper layer 34c and the lower layer 34d. It has an intermediate layer 34e formed by 21.
  • the outer protective portion 34a is formed by the upper layer 34c and a part of the intermediate layer 34e, and the upper layer 34c is located above the score line 31 and functions as a protective portion after the score line 31 is broken.
  • the inner protective portion 34b is formed by a part of the intermediate layer 34e and the lower layer 34d, and the lower layer 34d is located below the score line 31 and functions as a protective portion after the score line 31 is broken.
  • the finger insertion recess 35 is located below the rear end on which the finger of the tab 12 is hung, and is recessed from the outer surface of the panel portion 21.
  • the groove portion 22 is an annular recess that is continuously provided on the outer peripheral edge of the panel portion 21 and protrudes toward the can body when fixed to the can body.
  • the groove portion 22 has a function of improving the pressure resistance of the can lid 1.
  • the flange portion 23 is wound around the open end of the can body 101.
  • the flange portion 23 is provided with a resin layer for sealing on the surface that comes into contact with the can body 101.
  • the tab 12 includes a mounting portion 51, a tip portion 52, and a finger hook portion 53.
  • the tab 12 is integrally formed with a mounting portion 51, a tip portion 52, and a finger hook portion 53.
  • the tab 12 is opened by a finger or the like hung on the finger hook portion 53, so that the tip portion 52 presses a portion radially inwardly adjacent to the score line 31 of the panel portion 21 so that the score line 31 is formed. Break.
  • the mounting portion 51 is formed in a plate shape and has a rivet hole 51a.
  • the mounting portion 51 is continuous with the tip portion 52 and the finger hook portion 53.
  • the rivet hole 51a is formed to have an inner diameter into which the rivet portion 32 can be inserted.
  • the rivet portion 32 inserted into the rivet hole 51a is caulked, so that the mounting portion 51 is fixed to the panel portion 21 by the rivet portion 32.
  • the tip portion 52 is formed on the tip side of the tab 12.
  • the tip portion 52 is configured such that the shape of the tip is an arc shape or a polygonal shape.
  • the tip portion 52 is formed, for example, by double bending the outer peripheral edge excluding the tip.
  • the finger hook portion 53 is a portion on which a finger is hung to lift the tab 12 when the tab 12 is opened. As shown in FIGS. 1 and 2, for example, the finger hook portion 53 includes the ring hole 53a and is formed in an annular shape. As a specific example, the finger hook portion 53 is configured in a rectangular frame shape having an arcuate corner portion. The finger hook portion 53 is formed on the opposite side of the tip portion 52 with the mounting portion 51 interposed therebetween. When the tab 12 is attached to the panel portion 21, the rear end of the finger hook portion 53 faces the finger insertion recess 35. The finger hook portion 53 is formed, for example, by being bent so that the outer peripheral edge and the inner peripheral edge of the ring hole 53a are doubled.
  • the auxiliary score line 33 is located inward in the radial direction of the can lid 1 with respect to the second straight line Y passing through the center of the rivet portion 32. Therefore, even in a positive pressure state in which the can lid 1 swells in a dome shape with the central portion of the can lid 1 as the apex, the lever action when the tab 12 is lifted can be reliably applied. That is, it is possible to prevent the tip portion 52 of the tab 12 from being displaced toward the outer peripheral side of the can lid 1 when the tab 12 is opened.
  • the tip of the tip 52 can press a portion adjacent inward in the radial direction of the score line 31 of the panel 21, and an appropriate opening operation by the tab 12 can be performed. It can be carried out. Therefore, the can lid 1 can improve the openness of the can even if it is a positive pressure can, depending on the shape of the auxiliary score line 33 and the positional relationship between the rivet portion 32 and the auxiliary score line 33.
  • the can lid 1 has sufficient openness even when used for a positive pressure can.
  • the present invention is not limited to the above-described embodiment.
  • the configuration in which the auxiliary score line 33 is formed linearly has been described as an example in which the second portion 41b of the main score line 41 extends in the direction along the second straight line Y.
  • the second portion 41b may be curved rather than linear as long as it can be approximated to extend in the direction along the second straight line Y.
  • the radius of curvature of the second portion 41b is set to be an arc shape larger than the radius of curvature of the first portion 41a and the third portion 41c.
  • the can lid 1 has been described as an example of being used for a positive pressure can, but the present invention is not limited to this, and the can lid 1 may be used for a negative pressure can.
  • the present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof.
  • each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained.
  • the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Finger-Pressure Massage (AREA)
  • Closures For Containers (AREA)

Abstract

缶蓋（１）は、円板状のパネル部（２１）の外周縁側に設けられたスコア線（３１）と、パネル部（２１）に設けられ、スコア線（３１）の径方向で内方に隣接するリベット部（３２）と、リベット部（３２）に取り付けられるリベット孔（５１ａ）を有する取り付け部（５１）、取り付け部（５１）と連続する先端部（５２）、及び、取り付け部（５１）を挟んで先端部（５２）の反対側に形成される指掛け部（５３）を有するタブ（１２）と、パネル部（２１）に形成され、リベット部（３２）のパネル部（２１）の径方向内方で、リベット部（３２）に沿って円弧状に延在する第１部位（４１ａ）、及び、記第１部位と連続し、前記リベット部の中心と前記タブの先端と通る直線を第１直線とし、前記リベット部の中心を通って前記第１直線と直交する直線を第２直線としたときに、前記第２直線に沿った方向に延在し、且つ、前記第２直線よりも前記パネル部の中心側に位置する第２部位を有する補助スコア線（３３）と、を備える。

Description

缶蓋
　本発明は、缶に用いられる缶蓋に関する。
　従来、食品用の缶詰に用いられる缶の蓋として、全面開口する、所謂フルオープンタイプの缶蓋が多く使用されている。食品用の缶詰は、缶に内容物を充填した後、レトルト処理を行うことで、最終的な製品が形成され、缶の内圧が陰圧となる。しかしながら、日本国特開２０１２－１３１５１８号公報及び日本国特表平２－５０２８１４号公報に開示されるように、近年、内圧が陽圧の缶においても、フルオープンタイプの缶蓋を用いることが提案されている。
　このような缶蓋は、パネル部の周縁部側に形成され、開口片を区画する環状のスコア線と、開口用のタブを取り付けるためのリベット部の周辺に形成された補助スコア線を備えている。この補助スコア線は、タブの開口操作の初期において、タブの指掛け部に指を掛けてタブを持ち上げた際に、タブの先端部を支点とし、またタブの指掛け部を力点とし、リベット部を作用点とする第二種の挺子作用により破断する。
　この補助スコア線の破断により、リベット部周辺のパネル部が変形し易くなり、タブの指掛け部の持ち上げが容易となる。この補助スコア線の破断の状態から更に、タブを持ち上げると、リベットを支点とし、またタブの指掛け部を力点とし、タブの先端部を作用点とする第一種の挺子作用により、タブの先端部付近の環状スコア線が破断する。その後、タブの指掛け部を上方に引き上げることに伴って環状スコア線が円周方向に破断されて行き、缶蓋から開口片が取り外される。
日本国特開２０１２－１３１５１８号公報 日本国特表平２－５０２８１４号公報
　内圧が陽圧の缶の場合、容器内圧により缶蓋の中央部がドーム状に膨らむため、タブの先端部が外周側に向かって下方に傾斜する傾斜面上に位置するため、開口操作時にタブの先端部が缶蓋外周側に位置ずれし、適切な開口操作が行われない虞がある。
　そこで、本発明は、陽圧缶に用いた場合でも、十分な開蓋性を有する缶蓋を提供することを目的とする。
　本発明の一態様によれば、缶蓋は、円板状のパネル部と、前記パネル部の外周縁側に設けられたスコア線と、前記パネル部に設けられ、前記スコア線の径方向で内方に隣接するリベット部と、前記リベット部に取り付けられるリベット孔を有する取り付け部、前記取り付け部と連続する先端部、及び、前記取り付け部を挟んで前記先端部の反対側に形成される指掛け部を有するタブと、前記パネル部に形成され、前記リベット部の前記パネル部の径方向内方で、前記リベット部に沿って円弧状に延在する第１部位、及び、前記第１部位と連続し、前記リベット部の中心と前記タブの先端と通る直線を第１直線とし、前記リベット部の中心を通って前記第１直線と直交する直線を第２直線としたときに、前記第２直線に沿った方向に延在し、且つ、前記第２直線よりも前記パネル部の中心側に位置する第２部位を有する補助スコア線と、を備える。
　本発明によれば、陽圧缶に用いた場合でも、十分な開蓋性を有する缶蓋を提供することができる。
図１は、本発明の一実施形態に係る缶蓋の構成を示す平面図である。 図２は、同缶蓋の構成を示す断面図である。 図３は、同缶蓋の要部構成を示す断面図である。 図４は、同缶蓋に用いられるパネル部の構成を示す断面図である。 図５は、同缶蓋が用いられる缶の要部構成を示すとともに、内圧により缶蓋が膨張する例を示す断面図である。 図６は、同缶蓋が内圧により膨張する例において、タブを開口操作したときの状態の一例を示す断面図である。
　以下、本発明の一実施形態に係るタブ１２を有する缶蓋１の構成を、図１乃至図６を用いて説明する。　
　図１は、本発明の一実施形態に係る缶蓋１の構成を示す平面図であり、図２は、缶蓋１の構成を示す断面図である。図３は、缶蓋１のリベット部３２周辺の構成を示す断面図、図４は、パネル部２１に設けられた補助スコア線３３の構成を示す断面図である。図５及び図６は、缶蓋１が用いられる缶１００の構成であって、缶蓋１のパネル部２１がドーム状の膨らんだ状態を示す断面図である。なお、図５は、タブ１２による開口操作前、図６は、タブ１２による開口操作時の構成をそれぞれ示す。
　図１、図２、図５及び図６に示すように、缶蓋１は、例えば、全面開口する所謂フルオープンタイプである。図５及び図６に示すように、缶蓋１は、例えば、レトルト食品、炭酸飲料やアルコール飲料等の飲料等が内容物として収容される缶１００の当該内容物を缶１００内から外部に排出するための開口部を構成する部材である。缶蓋１は、缶１００の缶胴１０１に、巻き締め加工により一体に組み立てられる。これにより、缶１００は、缶蓋１及び缶胴１０１が巻締部１００ａにより気密に固定される。
　なお、缶１００は、例えば、内部が陽圧となる陽圧缶である。缶１００は、２ピース缶であっても３ピース缶であっても良い。内容物は、食品や飲料に限定されず、飲食品以外であってもよい。即ち、内容物は、缶１００に封入される種々のものが適用できる。
　図１及び図２に示すように、缶蓋１は、缶蓋本体１１と、タブ（缶蓋用タブ）１２と、を備える。缶蓋１は、金属板をプレス加工することで缶蓋本体１１及びタブ１２が別工程で成型され、その後、タブ１２がパネル部２１に固着されることで製造される。缶蓋本体１１を成形する金属板は、表面に樹脂皮膜が形成されたアルミニウム合金板や表面処理鋼板等が挙げられる。タブ１２を成形する金属板は、例えば、アルミニウム合金板等が挙げられる。
　図１乃至図３、図５及び図６に示すように、缶蓋本体１１は、パネル部２１と、パネル部２１の外周縁に設けられた環状の溝部２２と、環状の溝部２２の外周縁に設けられたフランジ部２３と、を備える。
　図１乃至図４に示すように、パネル部２１は、円板状に構成される。パネル部２１は、スコア線３１と、リベット部３２と、補助スコア線３３と、保護部３４と、指入れ用凹部３５と、を含む。また、パネル部２１は、缶１００の内容物を表示する点字等の表示部３６等を有していても良い。また、パネル部２１は、商品識別用、デザイン用、補強用等の凸部や凹部を有していても良い。
　図６に示すように、スコア線３１は、タブ１２の開口操作によって破断する。スコア線３１は、破断することで、缶蓋１の開口部をパネル部２１に成す。換言すると、スコア線３１は、缶蓋１の開口部を形成したときに、開口片となる領域を囲う。本実施形態における缶蓋１は、フルオープンタイプであることから、スコア線３１は、例えば、図１に示すように、円形状又は略円形状に形成される。そして、スコア線３１が破断することで、図６に示すように、リベット部３２とともに、パネル部２１のスコア線３１の径方向内方の部位を開口片として、パネル部２１のスコア線３１の径方向外方の部位から取り外すことを可能とする。
　スコア線３１は、外力により開口部の形状でパネル部２１の一部を破断させる脆弱部を構成する溝である。図３に示すように、スコア線３１は、例えば、パネル部２１の外面に設けられた楔状の溝であり、スコア線３１によってパネル部２１の一部が薄肉に形成される。なお、ここで、パネル部２１の外面とは、缶１００の缶胴１０１に缶蓋１が設けられた状態において、外部に露出する主面、即ち、缶１００の上面を構成する面である。
　スコア線３１は、例えば、保護部３４に配置される。なお、スコア線３１は、円形状に限定されず、例えば、一部間欠する円弧状に形成され、パネル部２１の大部分を開口させるとともに、開口した開口片がパネル部２１と一部で連続する構成であってもよい。
　図１乃至図３、図５及び図６に示すように、リベット部３２は、パネル部２１の一方の主面、具体的には、パネル部２１の外面に設けられる。リベット部３２は、パネル部２１の外周縁側であって、且つ、スコア線３１よりも中央側に設けられる。即ち、リベット部３２は、スコア線３１の径方向内方に、スコア線３１に隣接して設けられる。
　リベット部３２は、パネル部２１の一方の主面から突出する円柱状に構成される。リベット部３２は、パネル部２１の一部を円筒状に絞り加工することで成形される。また、リベット部３２は、タブ１２を配置後にかしめ加工することで、タブ１２をパネル部２１に固着する。なお、図１乃至図３、図５及び図６において、リベット部３２は、かしめ加工後の状態を示す。
　図１乃至図４に示すように、補助スコア線３３は、パネル部２１のリベット部３２の近傍に形成される。補助スコア線３３は、タブ１２の開口操作時に一部が破断する。補助スコア線３３は、例えば、主スコア線４１と、主スコア線４１のリベット部３２とは反対側に設けられた、主スコア線４１と平行な副スコア線４２と、を備える。
　主スコア線４１は、外力により開口部の形状でパネル部２１の一部を破断させる脆弱部を構成する溝である。主スコア線４１は、例えば、パネル部２１の外面に設けられた楔状の溝である。主スコア線４１によってパネル部２１の一部が薄肉に形成される。図６に示すように、主スコア線４１は、タブ１２の開口操作時に破断することで、リベット部３２の上方への移動を可能とする。
　図４に示すように、主スコア線４１は、第１部位４１ａと、第１部位４１ａと連続する一対の第２部位４１ｂと、一対の第２部位４１ｂのそれぞれと連続する一対の第３部位４１ｃと、を含む。主スコア線４１は、第１部位４１ａ、一対の第２部位４１ｂ及び一対の第３部位４１ｃが連続する。
　図４に示すように、第１部位４１ａは、リベット部３２のパネル部２１の径方向で内方に、リベット部３２に沿って円弧状に延在する。第１部位４１ａは、リベット部３２の中心とタブ１２の先端と通る直線を第１直線Ｘとし、リベット部３２の中心を通って第１直線Ｘと直交する直線を第２直線Ｙとしたとき、第２直線Ｙよりも缶蓋１の径方向で内方に配置される。即ち、第１部位４１ａの曲率半径は、かしめ加工される前のリベット部３２の半径よりも大径に設定される。
　図４に示すように、第２部位４１ｂは、それぞれ第１部位４１ａと連続し、第２直線Ｙに沿った方向に延在する。第２部位４１ｂは、例えば直線状に形成される。第１部位４１ａ及び第２部位４１ｂの連続する部位は、例えば、所定の曲率半径の円弧状に形成される。第２部位４１ｂは、第２直線Ｙよりも缶蓋１の径方向で内方に配置される。好ましくは、第２部位４１ｂと第２直線Ｙとの第１直線Ｘ方向の距離は０．２～２．０ｍｍの範囲である。図４に示すように、第３部位４１ｃは、それぞれ第２部位４１ｂと連続し、第２直線Ｙから離れる方向に曲がる。第３部位４１ｃは、例えば、第２直線Ｙよりも缶蓋１の径方向で内方に曲率中心を有する、異なる曲率半径の複数の円弧状に形成される。第３部位４１ｃは、第２直線Ｙよりも缶蓋１の径方向で内方に配置される。
　副スコア線４２は、主スコア線４１の第２直線Ｙよりもパネル部２１の径方向で内方に設けられる。副スコア線４２は、主スコア線４１と平行に形成される。副スコア線４２は、例えば、パネル部２１の外面に設けられた楔状の溝である。副スコア線４２は、主スコア線４１の深さよりも深さが浅く形成される。即ち、パネル部２１の副スコア線４２が設けられた部位の厚さは、パネル部２１の主スコア線４１が設けられた部位の厚さよりも厚く形成される。副スコア線４２によってパネル部２１の一部が薄肉に形成される。
　図２乃至図６に示すように、保護部３４は、パネル部２１が環状に折り返されることで形成される。保護部３４は、例えば、パネル部２１の外周縁よりも径方向で内方であって、且つ、リベット部３２よりも径方向で外方に４回折り返されることで形成される。即ち、保護部３４は、パネル部２１が５層で配置されることで形成される。保護部３４であって、且つ、パネル部２１の３層目にスコア線３１が形成される。
　保護部３４は、タブ１２を開口操作し、スコア線３１が破断したときに、スコア線３１で破断したパネル部２１の缶胴１０１に存する部位の内周縁を保護する外側保護部３４ａと、スコア線３１で破断したパネル部２１の缶胴１０１から外れた部位（開口片）の外周縁を保護する内側保護部３４ｂと、を構成する。外側保護部３４ａは、三層のパネル部２１によって構成され、折り返し部が開口したパネル部２１の内周縁に存する。内側保護部３４ｂは、三層のパネル部２１によって構成され、折り返し部がパネル部２１の開口から離れた部位の外周縁に存する。
　換言すると、図３に示すように、保護部３４は、缶蓋１の外面側に位置する、折り返された１層目及び２層目のパネル部２１によって形成される上層３４ｃと、缶蓋１の内面側に位置する、折り返された４層目及び５層目のパネル部２１によって形成される下層３４ｄと、上層３４ｃと下層３４ｄとの間に位置する、折り返された３層目のパネル部２１によって形成される中間層３４ｅとを有する。外側保護部３４ａは、上層３４ｃと中間層３４ｅの一部とにより形成され、上層３４ｃがスコア線３１の上方に位置し、スコア線３１の破断後の保護部として機能する。内側保護部３４ｂは、中間層３４ｅの一部と下層３４ｄとにより形成され、下層３４ｄがスコア線３１の下方に位置し、スコア線３１の破断後の保護部として機能する。
　指入れ用凹部３５は、タブ１２の指を掛ける後端の下方に位置し、パネル部２１の外面から窪む。
　溝部２２は、パネル部２１の外周縁に連続して設けられる、缶胴に固定したときに缶胴側に突出する環状の窪みである。溝部２２は、缶蓋１の耐圧性を向上する機能を有する。
　フランジ部２３は、缶胴１０１の開口端と巻き締めされる。フランジ部２３は、缶胴１０１と当接する面に、シール用の樹脂層が設けられる。
　図１乃至図３に示すように、タブ１２は、取り付け部５１と、先端部５２と、指掛け部５３と、を備える。タブ１２は、取り付け部５１、先端部５２及び指掛け部５３が一体に形成される。タブ１２は、指掛け部５３に掛けた指等によって開口操作されることで、先端部５２がパネル部２１のスコア線３１に径方向で内方に隣接する部位を押圧することで、スコア線３１を破断する。
　図３に示すように、取り付け部５１は、板状に形成され、リベット孔５１ａを有する。取り付け部５１は、先端部５２及び指掛け部５３と連続する。リベット孔５１ａは、リベット部３２を挿入可能な内径に形成される。リベット孔５１ａに挿入されたリベット部３２がかしめ加工されることで、取り付け部５１がリベット部３２によってパネル部２１に固定される。
　先端部５２は、タブ１２の先端側に形成される。先端部５２は、先端の形状が円弧状又は多角形状に構成される。先端部５２は、例えば、先端を除く外周縁が二重に折り曲げられることで形成される。
　指掛け部５３は、タブ１２の開口操作時にタブ１２を持ち上げるために指を掛ける部位である。図１及び図２に示すように、例えば、指掛け部５３は、リングホール５３ａを含み、環状に形成される。具体例として、指掛け部５３は、角部が円弧状の矩形枠状に構成される。指掛け部５３は、取り付け部５１を挟んで先端部５２の反対側に形成される。タブ１２がパネル部２１に取り付けられたときに、指掛け部５３の後端は、指入れ用凹部３５に対向する。指掛け部５３は、例えば、外周縁及びリングホール５３ａの内周縁が二重となるように折り曲げられることで形成される。
　このように構成された缶蓋１は、図４に示すように、補助スコア線３３が、リベット部３２の中心を通る第２直線Ｙよりも缶蓋１の径方向で内方に位置する。このため、缶蓋１の中心部を頂点として、缶蓋１がドーム状に膨らんだ陽圧状態でもタブ１２の持ち上げ時の梃子作用を確実に作用させることができる。即ち、タブ１２の開口操作時に、タブ１２の先端部５２が缶蓋１の外周側に位置ずれすることを抑制できる。よって、タブ１２を開口操作したときに、先端部５２の先端がパネル部２１のスコア線３１の径方向で内方に隣接する部位を押圧することが可能となり、適切なタブ１２による開口操作を行うことができる。よって、缶蓋１は、補助スコア線３３の形状、及び、リベット部３２及び補助スコア線３３の位置関係によって、陽圧缶であっても開蓋性を向上できる。
　上述したように、本発明の一実施形態に係る缶蓋１によれば、陽圧缶に用いた場合でも、十分な開蓋性を有する。
　なお、本発明は上述した実施形態に限定されない。例えば、上述した例では、補助スコア線３３は、主スコア線４１の第２部位４１ｂを第２直線Ｙに沿った方向に延在する例として、直線状に形成される構成を説明したがこれに限定されない。第２部位４１ｂは、第２直線Ｙに沿った方向に延在すると近似できるのであれば、直線状でなく、曲線状であってもよい。第２部位４１ｂを曲線状とする場合に、第２部位４１ｂの曲率半径は、第１部位４１ａ及び第３部位４１ｃの曲率半径よりも大きい円弧状に設定される。
　また、上述した例では、缶蓋１は、陽圧缶に用いる例を説明したがこれに限定されず、陰圧缶に用いてもよい。
　なお、本発明は、上記実施形態に限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で種々に変形することが可能である。また、各実施形態は適宜組み合わせて実施してもよく、その場合組み合わせた効果が得られる。更に、上記実施形態には種々の発明が含まれており、開示される複数の構成要件から選択された組み合わせにより種々の発明が抽出され得る。例えば、実施形態に示される全構成要件からいくつかの構成要件が削除されても、課題が解決でき、効果が得られる場合には、この構成要件が削除された構成が発明として抽出され得る。
　１…缶蓋、１１…缶蓋本体、１２…タブ（缶蓋用タブ）、２１…パネル部、２２…溝部、２３…フランジ部、３１…スコア線、３２…リベット部、３３…補助スコア線、３４…保護部、３４ａ…外側保護部、３４ｂ…内側保護部、３４ｃ…上層、３４ｄ…下層、３４ｅ…中間層、３５…指入れ用凹部、３６…表示部、４１…主スコア線、４１ａ…第１部位、４１ｂ…第２部位、４１ｃ…第３部位、４２…副スコア線、５１…取り付け部、５１ａ…リベット孔、５２…先端部、５３…指掛け部、５３ａ…リングホール、１００…缶、１００ａ…巻締部、１０１…缶胴。
 

Claims (2)

  1. 　円板状のパネル部と、
    　前記パネル部の外周縁側に設けられたスコア線と、
    　前記パネル部に設けられ、前記スコア線の径方向で内方に隣接するリベット部と、
    　前記リベット部に取り付けられるリベット孔を有する取り付け部、前記取り付け部と連続する先端部、及び、前記取り付け部を挟んで前記先端部の反対側に形成される指掛け部を有するタブと、
    　前記パネル部に形成され、前記リベット部の前記パネル部の径方向内方で、前記リベット部に沿って円弧状に延在する第１部位、及び、前記第１部位と連続し、前記リベット部の中心と前記タブの先端と通る直線を第１直線とし、前記リベット部の中心を通って前記第１直線と直交する直線を第２直線としたときに、前記第２直線に沿った方向に延在し、且つ、前記第２直線よりも前記パネル部の中心側に位置する第２部位を有する補助スコア線と、
    　を備える缶蓋。
  2. 　前記第２部位と前記第２直線との前記第１直線の延設方向の距離は０．２～２ｍｍの範囲に設定される、請求項１に記載の缶蓋。
     
PCT/JP2021/020028 2020-05-28 2021-05-26 缶蓋 WO2021241639A1 (ja)

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GB2620952A (en) * 2022-07-27 2024-01-31 Crown Packaging Technology Inc Full aperture can end

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