Full-opening tank cover

Abstract

The invention relates to a full-opening can cover. The can cover comprises a central plate, a pull ring, a main nick and an exhaust nick, wherein the central plate is provided with a rivet; the pull ring is riveted by a rivet; a main score extending around a peripheral region of the central plate, the main score defining a removable plate; the exhaust score is disposed on the removable plate. The vent score includes a pair of lateral portions extending radially not beyond a lateral axis extending through the center of the rivet and perpendicular to a longitudinal axis extending through the center of the rivet and the center of the central plate.

Description

Technical Field

[0001] The present invention relates to full opening can ends and full opening cans configured for use in pressurized applications, such as for containing soda, beer and other carbonated beverages, and some food products. Background Art

[0002] Known full opening can lids include a main score that extends around a major portion of a central panel of the can lid and defines a removable panel. A pull ring is attached to the removable panel by a rivet. The pull ring has a tail or handle end on one side of the rivet and a nose end on the other side of the rivet, and the pull ring is positioned so that its nose end is adjacent to or in contact with the main score. To open the can lid, the user lifts the tail or handle end of the pull ring so that the pull ring pivots around the rivet and presses against the nose end adjacent to the score, thereby propagating the break in the main score until the removable panel is separated from the rest of the can lid.

[0003] The process of forming a can lid consists of two key stages. First, a metal blank is pressed in a shell press to form a shell. The stacked shells are then transferred to a conversion press to be prepared for the second stage. The shells gradually become can lids as they pass through multiple stations, typically with the pull tab riveted to the rivet at the second-to-last station. Full-opening can lids can be attached to the can body by conventional seaming techniques.

[0004] In the case of food, full opening can lids are primarily designed to allow complete release of the food contained in the food can. Typically, such food is packaged under a slight negative pressure. However, in the case of pressurized food cans with positive internal pressure, the internal pressure is relatively low and is determined only by the internal pressure required to maintain the structural rigidity of the food can, which is typically relatively "thin-walled".

[0005] In contrast, in traditional beverage cans, beverage products (e.g., carbonated soft drinks or beer (e.g., lager)) are maintained at a much higher pressure than the internal pressure in the above-mentioned food cans, resulting in problems associated with the "explosion" of the can lid when initially opened by the user or when subjected to improper handling. For these reasons, traditional beverage cans have can lids that limit a restricted opening that can be safely opened by consumers. In order to achieve safe exhaust in a traditional pressurized beverage can (e.g., on a traditional 12 ounce (355 ml) beverage can) where the opening area is less than most of the central plate, beverage can manufacturers have adopted a feature that suspends the expansion of a single score line that limits the edge of the opening. The single score line of a beverage can usually has a check slot for suspending the expansion of the score. The check slot is a score residue (i.e., the metal at the bottom of the score) that is thicker than the rest of the score. Because the score residue is thicker, the check slot suppresses the expansion of the score fracture, so that a portion of the internal pressure is released before the rest of the score fractures. In this manner, the restraining groove slows or pauses score propagation for conventional beverage can lids to provide adequate venting early in the opening process.

[0006] Traditional beverage cans are often prohibited from being sold at festivals and events because the restricted opening prevents the contents of the can from being quickly discharged if the opened beverage can is thrown. Therefore, even if a traditional beverage can is opened at the point of sale at a festival or event, it may still be used as a dangerous projectile if thrown. In contrast, a full-open can, once opened, will quickly discharge its contents, making it an ineffective projectile if thrown. Therefore, a full-open can provides a safer alternative to traditional beverage cans if it can withstand the higher pressures of soda, beer, etc.

[0007] WO 2011 / 026900 A1 proposes a full opening beverage can lid for products pressurized to over 30 psi (207 kPa).

[0008] WO 2015 / 070051 A1 proposes a full opening beverage can lid having a venting test rating of at least 90 psi (620 kPa). Summary of the invention

[0009] From a first aspect, there is provided a full opening can cover, comprising:

[0010] a central plate having rivets;

[0011] a pull ring riveted by the rivet;

[0012] a main score extending around a peripheral region of the central panel, the main score defining a removable panel;

[0013] an exhaust score disposed on the removable plate, the exhaust score having:

[0014] (i) a central portion that intersects a longitudinal axis extending through the center of the rivet and the center of the central plate, the longitudinal axis being perpendicular to a transverse axis also extending through the center of the rivet; and

[0015] (ii) a pair of transverse portions, each of the transverse portions comprising one or more segments, the pair of transverse portions extending forwardly no further than the transverse axis; and

[0016] Wherein, along the longitudinal axis, the center of the rivet is located between 0.146 and 0.246 inches from the centerline of the main score.

[0017] At least one section of each transverse portion may extend substantially parallel to the transverse axis.The sections may be arranged along the transverse axis.

[0018] Optionally, the center plate includes a stamped portion proximate the rivet, and a center portion of the vent score intersects the stamped portion.

[0019] Along the longitudinal axis, the center of the rivet may be located between 0.025 and 0.120 inches from the centerline of the vent score.

[0020] In one example, along the longitudinal axis, the center of the rivet is located substantially 0.219 inches from the centerline of the major score.

[0021] Optionally, along the longitudinal axis, the center of the rivet is located between 0.025 and 0.100 inches from the centerline of the vent score. Along the longitudinal axis, the center of the rivet may be located between 0.025 and 0.050 inches from the centerline of the vent score. In one example, along the longitudinal axis, the center of the rivet is located substantially 0.099 inches from the centerline of the vent score.

[0022] The exhaust score may further include a pair of side portions, wherein each of the side portions extends from a corresponding lateral portion away from the lateral axis.

[0023] The full opening can lid may further include an anti-fracture score extending at least partially around the peripheral region radially inward of the main score. Along the longitudinal axis, the centerline of the anti-fracture score may be disposed between 0.030 and 0.070 inches from the centerline of the main score. In one example, along the longitudinal axis, the centerline of the anti-fracture score is disposed substantially 0.050 inches from the centerline of the main score.

[0024] The residual thickness of the anti-fracture score may be between 0.004 and 0.008 inches, and the residual thickness of the main score may be between 0.002 and 0.005 inches. The residual thickness of the anti-fracture score may be substantially 0.006 inches, and the residual thickness of the main score may be substantially 0.004 inches.

[0025] The pull ring may include a nose, and the pull ring may be riveted at the rivet so that the nose is disposed proximate to the main score, and the pull ring is elongated along the longitudinal axis. The pull ring may be configured so that the pull ring nose contacts the can lid radially outward of the main score. The pull ring may be configured so that the pull ring nose contacts the can lid within 0.015 inches of the main score.

[0026] The full opening tank cover may comprise a 3000 series aluminum alloy.

[0027] A full opening tank cover may have a vent test rating of at least 30 psi. A full opening tank cover may have a vent test rating of at least 70 psi. A full opening tank cover may have a vent test rating of at least 85 psi. A full opening tank cover may have a vent test rating of at least 90 psi.

[0028] Viewed from a second aspect, there is provided a can assembly comprising the full opening can lid of the first aspect and a can body, the can lid being seamed to the can body. The can assembly may be filled with a carbonated beverage.

[0029] From a third aspect, there is provided a full opening can cover, comprising:

[0030] a central plate having rivets;

[0031] a pull ring riveted by the rivet;

[0032] a main score extending around a peripheral region of the central panel, the main score defining a removable panel;

[0033] an exhaust score disposed on the removable plate, the exhaust score having:

[0034] (i) a central portion that intersects a longitudinal axis extending through the center of the rivet and the center of the central plate, the longitudinal axis being perpendicular to a transverse axis also extending through the center of the rivet; and

[0035] (ii) a pair of transverse portions, each of the transverse portions comprising one or more segments; and

[0036] Wherein, along the longitudinal axis, the center of the rivet is located between 0.146 and 0.246 inches from the centerline of the main score and between 0.025 and 0.120 inches from the centerline of the exhaust score.

[0037] Optionally, the pair of transverse portions extend forwardly no further than the transverse axis. This may or may not include the transverse axis.

[0038] At least one section of each transverse portion may extend substantially parallel to the transverse axis.The sections may be arranged along the transverse axis.

[0039] Optionally, the center plate includes a stamped portion proximate the rivet, and a center portion of the vent score intersects the stamped portion.

[0040] Optionally, along the longitudinal axis, the center of the rivet is located between 0.025 and 0.100 inches from the centerline of the vent score. Along the longitudinal axis, the center of the rivet may be located between 0.025 and 0.050 inches from the centerline of the vent score. In one example, along the longitudinal axis, the center of the rivet is located substantially 0.099 inches from the centerline of the vent score. In one example, along the longitudinal axis, the center of the rivet is located substantially 0.219 inches from the centerline of the main score.

[0041] The exhaust score may further include a pair of side portions, wherein each of the side portions extends from a corresponding lateral portion away from the lateral axis.

[0042] The full opening can lid may further include an anti-fracture score extending at least partially around the peripheral region radially inward of the main score. Along the longitudinal axis, the centerline of the anti-fracture score may be disposed between 0.030 and 0.070 inches from the centerline of the main score. In one example, along the longitudinal axis, the centerline of the anti-fracture score is disposed substantially 0.050 inches from the centerline of the main score.

[0043] The residual thickness of the anti-fracture score may be between 0.004 and 0.008 inches, and the residual thickness of the main score may be between 0.002 and 0.005 inches. The residual thickness of the anti-fracture score may be substantially 0.006 inches, and the residual thickness of the main score may be substantially 0.004 inches.

[0044] The pull ring may include a nose, and the pull ring may be riveted at the rivet so that the nose is disposed proximate to the main score, and the pull ring is elongated along the longitudinal axis. The pull ring may be configured so that the pull ring nose contacts the can lid radially outward of the main score. The pull ring may be configured so that the pull ring nose contacts the can lid within 0.015 inches of the main score.

[0045] The full opening tank cover may comprise a 3000 series aluminum alloy.

[0046] A full opening tank cover may have a vent test rating of at least 30 psi. A full opening tank cover may have a vent test rating of at least 70 psi. A full opening tank cover may have a vent test rating of at least 85 psi. A full opening tank cover may have a vent test rating of at least 90 psi.

[0047] From a fourth aspect, there is provided a can assembly comprising the full opening can cover of the third aspect and a can body, the can cover being seamed to the can body. The can assembly can be filled with a carbonated beverage.

[0048] From a fifth aspect, there is provided a full opening can cover, comprising:

[0049] a central plate having rivets;

[0050] a pull ring riveted by the rivet;

[0051] a main score extending around a peripheral region of the central panel, the main score defining a removable panel;

[0052] an exhaust score disposed on the removable plate, the exhaust score having:

[0053] (i) a central portion that intersects a longitudinal axis extending through the center of the rivet and the center of the central plate, the longitudinal axis being perpendicular to a transverse axis also extending through the center of the rivet; and

[0054] (ii) a pair of transverse portions, each of the transverse portions comprising one or more segments;

[0055] an anti-fracture score extending at least partially around the peripheral region radially inwardly of the main score,

[0056] Wherein, along the longitudinal axis, the centerline of the anti-fracture score is arranged at a position between 0.030 and 0.070 inches from the centerline of the main score, wherein the residual thickness of the anti-fracture score is between 0.004 and 0.008 inches, and the residual thickness of the main score is between 0.003 and 0.005 inches.

[0057] The residual thickness of the anti-break score may be substantially 0.006 inches. The residual thickness of the main score may be substantially 0.004 inches. In one example, along the longitudinal axis, the centerline of the anti-break score is disposed at a position substantially 0.050 inches from the centerline of the main score.

[0058] Optionally, the pair of transverse portions extend forwardly no further than the transverse axis. This may or may not include the transverse axis.

[0059] At least one section of each transverse portion may extend substantially parallel to the transverse axis.The sections may be arranged along the transverse axis.

[0060] Optionally, the center plate includes a stamped portion proximate the rivet, and a center portion of the vent score intersects the stamped portion.

[0061] Along the longitudinal axis, the center of the rivet may be located between 0.146 and 0.246 inches from the centerline of the main score and between 0.025 and 0.120 inches from the centerline of the vent score.

[0062] Optionally, along the longitudinal axis, the center of the rivet is located between 0.025 and 0.100 inches from the centerline of the vent score. Along the longitudinal axis, the center of the rivet may be located between 0.025 and 0.050 inches from the centerline of the vent score. In one example, along the longitudinal axis, the center of the rivet is located substantially 0.099 inches from the centerline of the vent score. In one example, along the longitudinal axis, the center of the rivet is located substantially 0.219 inches from the centerline of the main score.

[0063] The exhaust score may further include a pair of side portions, wherein each of the side portions extends from a corresponding lateral portion away from the lateral axis.

[0064] The pull ring may include a nose, and the pull ring may be riveted at the rivet so that the nose is disposed proximate to the main score, and the pull ring is elongated along the longitudinal axis. The pull ring may be configured so that the pull ring nose contacts the can lid radially outward of the main score. The pull ring may be configured so that the pull ring nose contacts the can lid within 0.015 inches of the main score.

[0065] The full opening tank cover may comprise a 3000 series aluminum alloy.

[0066] A full opening tank cover may have a vent test rating of at least 30 psi. A full opening tank cover may have a vent test rating of at least 70 psi. A full opening tank cover may have a vent test rating of at least 85 psi. A full opening tank cover may have a vent test rating of at least 90 psi.

[0067] From a sixth aspect, there is provided a can assembly comprising the full opening can cover of the fifth aspect and a can body, the can cover being seamed to the can body. The can assembly may be filled with a carbonated beverage. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 is a perspective view of a known beverage can showing a full opening can lid with a pull ring in an early stage of its actuation;

[0069] Figure 2 yes Figure 1A perspective view of the can of FIG. 1 showing a broken exhaust score and a flap slightly displaced to form an exhaust opening;

[0070] Figure 3 yes Figure 1 A perspective view of a can of , showing a fully open position;

[0071] Figure 4 yes Figure 1 A top view of a can of , wherein the pull ring is shown as transparent to show the vent score;

[0072] Figure 5 yes Figure 1 A cross-sectional view of a can of , showing the peripheral bead in its construction prior to being seamed to the can body;

[0073] Figure 6 yes Figure 4 an enlarged view of a portion of;

[0074] Figure 7 It is used to form Figure 4 and Figure 6 A top view of the punch with exhaust notches shown;

[0075] Figure 8 yes Figure 7 An enlarged view of a portion of the punch;

[0076] Fig.9A yes Figure 1 A top view of a can of , wherein the pull ring is shown as transparent to show the vent score;

[0077] Fig. 9B is a top view of a shell and a can body according to the present invention;

[0078] Fig. 9C yes Fig. 9B an enlarged view of a portion of;

[0079] Fig.10 yes Fig. 9B A top view of a can of , wherein the pull ring is shown attached to the can lid; and

[0080] Fig.11 yes Fig. 9B A cross section of a portion of a can lid showing the relative geometries of the main score and the anti-fracture score. DETAILED DESCRIPTION

[0081] Figures 1 to 6A known beverage can as taught in WO2015 / 070051A1 is shown. The can assembly 10 includes a single-piece can body 12 and a can lid 14. The can body 12 and the can lid 14 are connected together by a seam (e.g., a conventional double seam) 16. The can body 12 is a conventional drawn and wall-thinned 12-ounce (355 ml) beverage can body formed from a single piece of aluminum. Alternative can bodies of different sizes are also known, such as 16 ounces (473 mL) and 20 ounces (590 mL) sizes and metric volume equivalents. The can lid 14 is typically produced in a shell press that operates at greater than 300 strokes / minute, typically 450 strokes / minute.

[0082] exist Figure 5 In the unseamed state shown, the can lid 14 includes a peripheral bead 23, a wall 20, a countersunk hole 22, and a central panel 24. Figures 1 to 4 As shown, in the seamed state, the peripheral curling has been processed to form a portion of the seam 16. The can lid is 200, 202, 204 or 206 size, although the present invention includes can lids of any size, preferably 200 or 202 size. The present invention also includes any configuration of the wall 20 and the countersunk hole 22. The wall configuration can include a traditional B64 wall, an inclined bayonet wall, a curved bayonet wall, a multi-part bayonet wall, a bayonet wall with features such as shelves, kicks, kinks, etc. The countersunk hole configuration can include a countersunk hole with a straight sidewall, a curved sidewall, a narrow rib, a wide rib, a folded or extruded rib, etc.

[0083] The can lids described herein are typically formed from 5000 series aluminum alloys. Specifically, the 5000 series aluminum alloys used for can lid manufacturing have an ultimate tensile strength of 375 to 415 MPa. This ultimate tensile strength range is applicable to a given internal pressure of a can of a given standard diameter can lid used in the art. This ultimate tensile strength range is also associated with a relatively greater tearing tendency at the end of the notch relative to softer metals. An example of a 5000 series aluminum alloy is 5182, the general chemical composition (%) of which is provided in the table below. The temper is H49. It should be noted that the composition of the same grade of aluminum alloy may vary slightly from supplier to supplier.

[0084] Table 1

[0085]

[0086] The can covers described herein are not limited to this particular alloy, but also include steel (eg, tinplate), other grades of aluminum, and the like.

[0087] For example, sometimes a 3000 series aluminum alloy may be used, but thicker material may be required. 3000 series aluminum alloys are more typically used for can body manufacturing, but can also be used to make can ends. This is particularly useful when supply is short. An example of a 3000 series aluminum alloy is 3104, the chemical composition (%) from one supplier is provided in the table below. The temper is H19. Typically, 3000 series aluminum alloys used for can body manufacturing have a tensile strength (as rolled) of 290 to 330 MPa.

[0088] Table 2

[0089]

[0090] The central panel 24 of the can lid 14 is circular and has a periphery 25 adjacent to the rib 22. The can lid 14 further includes a main score 26 disposed adjacent to the periphery 25 of the central panel. The main score 26 is continuous so as to form a removable panel 34. Figure 4 As shown, the can lid includes an anti-fracture score 57 that extends at least partially around the central plate radially inward of the main score 26. The anti-fracture score 57 reduces stress and provides a means of handling loose metal during production. A pull ring 32 including a nose 31 is attached to a removable plate 34 of the central plate 24 by a rivet 30 so that the nose 31 is disposed adjacent to the main score 26. When the pull ring 32 is riveted to the central plate 24, a button impression 29 is formed on the central plate 24 around the rivet 30. The button impression 29 is defined by a stamped portion of the central plate 24 that is formed during the conversion process before the pull ring is riveted to the can lid.

[0091] To aid in describing the central plate 24, a primary or central reference axis P L is defined as the longitudinal centerline extending through the center of the rivet 30 and through the pull ring 32 ( Figure 4 ). The pull ring 32 is arranged along the line P L For most commercial pull tabs, as shown in the figure, the main reference line P L The initial contact point between the nose that will extend through the pull ring 32 and its initial contact point on the central plate. The central plate may include ribs or dimples such as Figure 4 Not shown, but in e.g. Fig. 9B and Fig. 9C ) that at least partially restricts rotation of the pull ring when it is not aligned with the longitudinal axis. Transverse reference axis or line T L is defined as extending through the center of the rivet 30 and perpendicular to the main reference line P L . By line P L and T LThe plane defined by the seam is parallel to the plane defined by the top of the seam and is parallel to the central panel 24, so that the central panel 24 defines a plane in its seamed or unseamed state. L The can lid 14 is divided into a front portion on the pull ring nose side and a rear portion on the pull ring heel side.

[0092] The exhaust notch 40 includes a L The intersecting central portion 42 and the line P arranged around the central portion 42 L A pair of suppression grooves 45a and 45b on both sides ( Figure 6 ), and a pair of transverse portions 46a and 46b extending from the suppression grooves 45a and 45b. Each of the transverse portions 46a and 46b includes a section 47a, 47b and a pair of side portions 50a and 50b, the sections 47a, 47b are generally parallel to the transverse axis, and the pair of side portions 50a and 50b are respectively separated from the transverse portions 46a and 46b away from the line T L extend.

[0093] like Figure 4 As shown, for the sake of convenience of explanation, only the periphery of the pull ring is shown, the inside of the pull ring is transparent, and the central portion 42 of the exhaust score 40 has a circular section, which surrounds the rivet 30 (at P L With T L The center portion 42 may be at least partially defined by a radius of 0.140 inches, or alternatively, by a radius of at least 0.140 inches, extending from the center of the rivet 30. Alternatively, the center portion 42 may be at least partially defined by a radius within the range of 0.132 to 0.150 inches. For example, the center portion 42 may be at least partially defined by 0.132, 0.133, 0.134, 0.135, 0.136, 0.137, 0.138, 0.139, 0.140, 0.141, 0.142, 0.143, 0.144, 0.145, 0.146, 0.147, 0.148, 0.149, 0.150 inches (and their corresponding metric values ​​3.35, 3.36, 3.37, 3.38, 3.39, 3.40, 3.41, 3.42, 3.43, 3.44, 3.45, 3.46, 3.47, 3.48, 3.49, 3.50, 3.51, 3.52, 3.53, 3.54, 3.55, 3.56, 3.57, 3.58, 3.59, 3.60, 3.61, 3.62, 3.63, 3.64, 3.65, 3.66, 3.67, 3.68, 3.69, 3.70, 3.71, 3.72, 3.73, 3.74, 3.75 .37, 3.39, 3.41, 3.43, 3.45, 3.47, 3.49, 3.51, 3.53, 3.55, 3.57, 3.59, 3.61, 3.63, 3.65, 3.67, 3.69, 3.71, 3.73, 3.75, 3.77, 3.79, 3.81 mm), or a range of radii encompassed by at least two of the radii described herein. The central portion 42 extends from the central portion 42 to the central portion 42. LThe radius extends forward from the intersection of the rivet 30 and extends to approximately 3 o'clock and 9 o'clock positions around the rivet 30. The radius size can be selected based on known parameters, such as center plate thickness, score thickness, suppression groove thickness, material selection, etc.

[0094] Suppression grooves 45a, 45b extend from central portion 42 and have a shallower score than the central portion, so that the metal in the area of ​​suppression grooves 45a, 45b is thicker relative to the metal in central portion 42. Each of suppression grooves 45a, 45b conforms to a respective inner end of transverse portions 46a and 46b through transitions 44a and 44b. Transverse portions 46a and 46b are generally transverse (i.e., generally parallel to transverse reference line T L ) and extend outwardly relative to rivet 30. Side portions 50a and 50b extend generally rearwardly from the outer ends of transverse portions 46a and 46b through transition portions 48a and 48b. Side portions 50a and 50b terminate at terminals 52a and 52b. The vent score terminals may be curved, curled, or angled relative to the sides of the vent score, or they may simply be the ends of straight sidewalls, as shown.

[0095] In some examples, the vent score 40 does not have a suppression groove. Although the vent score 40 has similar dimensions to a can lid with a suppression groove, when the suppression groove is not used, the central portion 42 extends directly to the transition portions 44a and 44b. The lateral portions 46a and 46b extend from the transition portions 44a and 44b to the transition portions 48a and 48b. The side portions 50a and 50b end at the terminal ends 52a and 52b.

[0096] like Figure 6 As shown, a hinge 54 is formed on the removable panel 34 between the terminal ends 52a and 52b of the side portions 50a and 50b. A flap 56 is defined by the vent score 40 and the hinge 54. The front of the flap 56 is defined by the transverse portions 46a and 46b. The sides of the flap 56 are defined by the side portions 50a and 50b. The rear of the flap 56 is formed by the hinge 54 (the location of which is less clear).

[0097] In the can lid of WO2015 / 070051A1, reference is made to forming a Figure 8 The enlarged view of the exhaust score tool 80 shown provides information on the size of the exhaust score 40. Specifically, a portion of the exhaust score 40 extends to (or substantially extends to) the transverse reference line T L or its front side to facilitate the movement or articulation of the pull ring and the rivet. For example, the transverse portions 46a and 46b extend toward the transverse line T L The front extension dimension D1 is positive and is between 0 and 0.050 inches, more typically between 0.010 inches and 0.032 inches. Figures 1 to 6In the example shown, D1 is approximately 0.021 inches.

[0098] The side portions 50a and 50b are spaced apart from each other and extend rearwardly so that the flap 56 creates a sufficient exhaust area. Figure 2 In this regard, the side portions 50a and 50b are identified by reference numeral 41. L The rearward extension distance D2 may be between 0.15 and 0.4 inches, more typically between 0.2 and 0.3 inches. Figures 1 to 6 In the example shown, D2 is 0.217 inches. The ends of the side terminals 52a and 52b are spaced apart by a distance between 0.5 inches and 1.0 inches and between 0.6 and 0.8 inches. In this case, the distance between 52a and 52b is 0.746 inches.

[0099] The exhaust score sides may be curved or straight and may be oriented relative to the main reference line P. L Any angle A orientation can be measured. For example, A can be approximately zero (ie, the exhaust notch side can be approximately parallel to the main reference line P L ), between + / -10 degrees, between + / -20 degrees, or between + / -30 degrees. Figures 1 to 6 In the example shown, angle A is 5 degrees. The central portion 42 and the lateral portions 46a and 46b may have shapes other than those shown in the drawings.

[0100] The exhaust score 40 has a substantially uniform score residual size at least through the score center portion 42, the lateral portions 46a and 46b, and the front of the score side portions 50a and 50b. In WO2015 / 070051A1, the score residual size of the score center portion 42, the lateral portions 46a and 46b, and the front of the score side portions 50a and 50b is between 0.0020 and 0.0045 inches. The score residuals of the suppression grooves 45a, 45b are generally larger than the score residuals of the score center portion 42, the lateral portions 46a and 46b, and the front of the score side portions 50a and 50b. Specifically, the score residual of the suppression groove can be larger than about 0.0040 inches, so that the residue of the suppression groove is between 0.0060 and 0.0085 inches. The anvil on which the tool 80 acts can optionally have a step for controlling the residual size.

[0101] To describe the operation of the tank assembly 10, particular reference is made to Figures 1 to 3 as well as Figure 6 Prior to opening, the can assembly 10 generates internal pressure when filled with a carbonated soft drink, beer, etc. The score marks 26 and 40 are intact and the pull ring 32 is in a normal resting position generally flat against the center panel 24 or generally horizontal.

[0102] To open the can assembly 10, the user lifts the heel end of the pull ring 32, moving the pull ring nose toward the center panel 24 while deflecting the metal around the rivet until the scored center portion 42 breaks, as shown. Figure 2 shown.

[0103] Typically, a portion of the venting score 40 breaks before any portion of the main score 26 breaks to achieve venting. As the suppression grooves 45a, 45b break, the expansion of the venting score 40 is limited. The thickened metal in the area of ​​the suppression grooves 45a, 45b (if used) breaks more slowly than the rest of the venting score 40. As the flap 56 moves upward around the hinge 54, the rupture of the venting score 40 then expands through the lateral portions 46a and 46b and expands backward through the score side portions 50a and 50b. In this regard, the internal pressure of the can actuates the flap 56 to quickly produce a relatively large opening area for venting the can. Then, similar to the opening of a conventional can lid, the user continues to actuate the pull ring 32 until the main score 26 breaks and the removable plate 34 is separated to produce a full opening 60.

[0104] As mentioned above, Figures 1 to 8 It is provided for illustrative purposes and shows a known can lid as described in WO 2015 / 070051 A1.

[0105] 9A to 9C The difference between the can cover according to the embodiment of the present invention and the known full opening can cover of WO 2015 / 070051 A1 is shown. Figures 1 to 8 Similar features are indicated by the same numbered reference numerals. Fig.9A Corresponds to Figure 4 ,and Fig. 9B A full opening can lid according to an embodiment of the present invention is shown. Fig. 9C Shows Fig. 9B A magnified detail of the jar lid.

[0106] By Fig.9A and 9B Line AA (through the center of the can lid) to T L The distance L1 between the line AA and T L ', it can be seen that the rivet 30 of the can lid of the embodiment of the present invention is arranged farther away from the center of the central plate and closer to the main score. The geometry of the associated embossed portion 29 and the vent score 40 surrounding the rivet is also changed to match the new positioning of the rivet 30 closer to the main score 26. Fig. 9C As shown, along the longitudinal axis P L The center of the rivet 30 and the center line T of the main score 26 LThe distance between the longitudinal axis P is represented by the distance L3. L The distance between the center of the rivet 30 and the centerline of the exhaust score 40 is represented by the distance L4. The term centerline of the score refers to a line representing the middle of the base of the score, such as Fig.11 Line T L ” and T L ”'. L3 is envisioned to be between 0.146 and 0.246 inches, preferably 0.219 inches, and L4 is envisioned to be between 0.025 and 0.120 inches, for example 0.099 inches. Distance L2 is envisioned to be substantially between 0.590 and 0.629 inches, for example 0.602 inches. Unlike WO2015 / 070051A1, the exhaust notch 40 intersects the embossed portion.

[0107] The change of the position of the rivet 30 closer to the main score 40 allows for a smaller pull ring, particularly a pull ring with a shortened front portion. By arranging the central portion 42 of the vent score 40 to pass through the stamped portion 29, the ability of the can lid to withstand typical internal pressures of soda, beer, lager, etc. (e.g., between 30 and 90 psi, or between 206 and 620 kPa) is at least partially maintained. A shorter, more rigid pull ring uses less metal, thereby contributing to lightweighting. In addition, the length of the pull ring makes it compatible with more modern, higher speed conversion presses, thereby achieving higher output. The displacement of the rivet 30 and the subsequent use of a shorter pull ring does not adversely affect the container's use parameters (e.g., burst value, tear value, and pull ring strength). For example, containers having can lids of the present invention were found to achieve a burst value of about 4.5 ± 1.5 lbs (20.0 N), a tear value of about 3.4 ± 1.1 lbs (15.1 N), and a minimum tab strength of 7 lbs (31.1 N), all of which are within acceptable industry standards.

[0108] In addition, if Fig. 9C As shown, positioning the rivet 30 closer to the main score 26 as described above enables the lateral portions 46a, 46b of the exhaust score to be positioned approximately on line T L ' or line T L ', i.e., closer to the center of the can lid, without adversely affecting the correct function of the venting score 40. This is in accordance with WO2015 / 070051A1 Figure 8 In contrast, Figure 8 In the middle, the transverse parts 46a, 46b are on the line T L The outer side of the housing extends a distance D1.

[0109] Although in 9A to 9C2015 / 070051A1, but the positioning of the rivet 30 closer to the main score 26 also allows the length of the side portions 50a, 50b of the vent score 40 to be reduced or completely eliminated compared to WO2015 / 070051A1, thereby simplifying the can lid without adversely affecting the ability of the vent score to break first during the opening process, and controlling the pressure difference between the outer and inner surfaces of the central panel to allow the main score 26 to tear in a controlled and reliable manner. For example, while the side portions 50a, 50b can be approximately 0.217 inches as in WO2015 / 070051A1, in certain embodiments of the present invention, they can be smaller, such as between 0 and 0.1539 inches, such as 0.1377 inches, 0.0885 inches, 0.0393 inches or less.

[0110] Fig.10 The can body 12 is assembled with the can body 12. FIG. 9B to FIG. 9C The can lid of the present invention is shown, and now also the pull ring 32 is shown. As mentioned above, considering that the rivet 30 is closer to the main score 26, the front part of the pull ring 32, that is, the part of the pull ring outside the rivet 30 and having the nose 31, is larger than the front part of the pull ring 32. Figure 4 The pull tab is much shorter, which uses less metal and helps with weight reduction.

[0111] Fig.11 Illustratively shown Fig. 9B , Fig. 9C and Fig.10 A portion of the can lid is in an axial cross section near the main score 26. Fig.11 As shown, the can lid includes an anti-fracture score 57 that extends at least partially around the central plate and radially inward of the main score 26. This particular anti-fracture score is configured to increase the processing window for the main score and the exhaust score to remain, which is advantageous from a production perspective. Although it is contemplated that the anti-fracture score 57 extends around the entire circumference of the central plate, it can extend only partially around the central plate, such as 90%, 80%, 70%, or less. Along the longitudinal axis, the centerline T of the anti-fracture score 57 is 1.5 mm thick and 1.5 mm thick. L ”' is preferably arranged at a distance T from the center line of the main score 26 L ” 0.030 to 0.070 inches. In this embodiment, along the longitudinal axis, the center line T of the anti-fracture score 57 L ”' is arranged at a distance T from the center line of the main score 26 L” is substantially 0.050 inches. The residual thickness 58 of the anti-fracture score 57 (i.e., the remaining material thickness after the score is formed) is between 0.004 and 0.008 inches, and the residual thickness 59 of the main score 26 is between 0.002 and 0.005 inches. Preferably, the residual thickness 58 of the anti-fracture score 57 is substantially 0.006 inches, and the residual thickness 59 of the main score 26 is substantially 0.004 inches.

[0112] The width of the main score 26 at its base is contemplated to be no greater than about 0.0012 inches, while the width of the anti-break score 57 at its base is contemplated to be no greater than about 0.003 inches. The aforementioned widths of the main score 26 and the widths of the anti-break score 57 assume that the bases of the scores are planar and parallel to the central plate 24. However, the bases of either or both of the scores 26, 57 may be reduced to a point (not shown).

[0113] It is contemplated that the thickness 60 of the metal of the can lid is between approximately 0.008 and 0.013 inches, with 0.008 inches being preferred.

[0114] The embodiments shown in the drawings and described above illustrate embodiments and aspects of the present invention. The present invention is not limited to the specific embodiments shown in the drawings, but encompasses a broader structure than this disclosure and is limited only by the claims.

[0115] For example, where the pair of transverse portions are described as extending no further forward than the transverse axis, this means that the transverse portions do not extend beyond the transverse axis in a direction parallel to the longitudinal axis and away from the center of the central panel.

[0116] For example, unless limited in the claims, the present invention covers materials, bayonet wall configurations, seam structures, and processes not shown in the drawings.

[0117] In a further example, the tank cover may include ribs on the central panel to increase the strength of the central panel and its ability to withstand pressure from the interior of the tank and external forces applied to the tank, such as during handling.

[0118] In a further example, the central portion 42 of the exhaust score may be at least partially defined by a radius of 0.160 inches, or alternatively defined by a radius of at least 0.160 inches, the radius being centered about the line P. LAlternatively, the central portion 42 may be at least partially defined by a radius within the range of 0.132 to 0.180 inches. For example, the central portion 42 may be at least partially defined by 0.132, 0.133, 0.134, 0.135, 0.136, 0.137, 0.138, 0.139, 0.140, 0.141, 0.142, 0.143, 0.144, 0.145, 0.146, 0.147, 0.148, 0.149, 0.150, 0.151, 0.152, 0.153, 0.154, 0.155, 0.156, 0.157, 0.158, 0.159, 0.160, 0.161, 0.162, 0.163, 0.164, 0.165, 0.166, 0.167, 0.168, 0.169, 0.170, 0.171, 0.172, 0.173, 0.174, 0.175 7, 0.158, 0.159, 0.160, 0.161, 0.162, 0.163, 0.164, 0.165, 0.166, 0.167, 0.168, 0.169, 0.170, 0.171, 0.172, 0.173, 0.174, 0.175, 0.176, 0.177, 0.178, 0.179, 0.180 inches, or a radius range encompassed by at least two of the radii described herein.

[0119] In a further example, the structure and operation of the pull ring affect the reliability and predictability of the fracture of the main score 26. In this regard, if the pull ring nose 31 is too far from the main score 26, the opening force becomes too high and may cause the pull ring to bend or break. Depending on the location of the rivet and the design of the pull ring, the pull ring nose can contact the can lid at one of three locations: radially inside the main score; at or above the main score; or radially outside the main score. Optionally, the pull ring is configured so that the pull ring nose contacts the can lid radially outside the main score and within 0.015 inches of the main score (measured from its outer edge). Ideally, the contact occurs along the centerline of the can lid. Alternatively, the pull ring can be configured so that the pull ring nose contacts the can lid radially inside the main score and within 0.015 inches of the main score (measured from its inner edge). Again, ideally, with this configuration, the contact will occur along the centerline of the can lid.

[0120] The user can also measure the position of the pull ring nose 31 in a resting state before the pull ring is actuated. In this regard, the pull ring nose 31 is typically between 0.000 and 0.008 inches, more typically between 0.000 and 0.005 inches, from the outer edge of the main score 26 as measured radially outward. The difference between the position of the pull ring nose 31 relative to the main score 26 in its initial contact state and its resting state is due to the rotation during the pull ring actuation process. The pull ring rotates forward during the actuation and opening process, mainly due to the deflection of the central plate near the rivet and the opening of the vent score 40. The magnitude of the rotation of the pull ring nose 31 also depends on the internal tank pressure. Generally, higher internal pressures produce correspondingly larger rotations. For simplicity, the position of the pull ring nose 31 relative to the main score 26 is measured by looking directly down at the tank lid with a microscope. The exact location of the tab nose 31 of the shorter tab of an embodiment of the present invention relative to the main score 26 can be selected based on the design parameters of the specific can end, such as the main score configuration, tab design, vent score design, internal pressure, and other factors that will be understood by those familiar with can end engineering and design.

Claims

1. A full-opening can cover, comprising: a central plate having rivets; a pull ring riveted by the rivet; a main score extending around a peripheral region of the central panel, the main score defining a removable panel; an exhaust score disposed on the removable plate, the exhaust score having: (i) a central portion that intersects a longitudinal axis extending through the center of the rivet and the center of the central plate, the longitudinal axis being perpendicular to a transverse axis also extending through the center of the rivet; and (ii) a pair of transverse portions, each of the transverse portions comprising one or more segments, the pair of transverse portions extending forwardly no further than the transverse axis; as well as Wherein, along the longitudinal axis, the center of the rivet is located between 0.146 and 0.246 inches from the centerline of the main score.

2. The full opening can lid according to claim 1, wherein: At least one section of each transverse portion extends substantially parallel to the transverse axis.

3. The full opening can cover according to claim 2, wherein: The segments are arranged along a transverse axis.

4. The full opening can cover according to claim 1, 2 or 3, wherein: The center plate includes a stamped portion proximate the rivet, and wherein a center portion of the vent score intersects the stamped portion.

5. A full opening can lid according to any one of the preceding claims, wherein: Along the longitudinal axis, the center of the rivet is located between 0.025 and 0.120 inches from the centerline of the vent score.

6. The full opening can lid according to claim 5, wherein: Along the longitudinal axis, the center of the rivet is located between 0.025 and 0.100 inches from the centerline of the exhaust score.

7. The full opening can lid according to claim 6, wherein: Along the longitudinal axis, the center of the rivet is located between 0.025 and 0.050 inches from the centerline of the vent score.

8. The full opening can cover according to claim 6 or 7, wherein: Along the longitudinal axis, the center of the rivet is located substantially 0.099 inches from the centerline of the exhaust score.

9. The full opening can lid according to claim 8, wherein: Along the longitudinal axis, the center of the rivet is located substantially 0.219 inches from the centerline of the major score.

10. A full opening can lid according to any one of the preceding claims, wherein: The exhaust score further includes a pair of side portions, wherein each of the side portions extends from a corresponding lateral portion away from the lateral axis.

11. A full opening can cover according to any one of the preceding claims, further comprising an anti-fracture score extending at least partially around the peripheral region radially inwardly of the main score.

12. The full opening can cover according to claim 11, wherein: Along the longitudinal axis, the centerline of the anti-break score is disposed between 0.030 and 0.070 inches from the centerline of the main score.

13. The full opening can cover according to claim 12, wherein: Along the longitudinal axis, the centerline of the anti-break score is disposed substantially 0.050 inches from the centerline of the main score.

14. The full opening can cover according to claim 11, 12 or 13, wherein: The residual thickness of the anti-fracture score is between 0.004 and 0.008 inches, and the residual thickness of the main score is between 0.003 and 0.005 inches.

15. The full opening can cover according to claim 14, wherein: The residual thickness of the anti-fracture score is substantially 0.006 inches, and the residual thickness of the main score is substantially 0.004 inches.

16. A full opening can lid according to any one of the preceding claims, wherein: The pull ring includes a nose, and the pull ring is riveted at the rivet so that the nose is arranged adjacent to the main score, and the pull ring is elongated along the longitudinal axis.

17. The full opening can cover according to claim 16, wherein: The pull ring is arranged so that the pull ring nose contacts the can lid radially outside the main score.

18. The full opening can cover according to claim 17, wherein: The tab is configured so that the tab nose contacts the can lid within 0.015 inches of the main score.

19. A full opening can end as claimed in any preceding claim comprising a 3000 series aluminium alloy.

20. A full opening can lid according to any one of the preceding claims having a vent test rating of at least 30 psi.

21. A full opening can lid according to any one of the preceding claims having a vent test rating of at least 70 psi.

22. A full opening can lid according to any one of the preceding claims having a vent test rating of at least 85 psi.

23. A full opening can lid according to any one of the preceding claims having a vent test rating of at least 90 psi.

24. A can assembly comprising a full opening can lid according to any one of the preceding claims and a can body, the can lid being seamed to the can body.

25. The can assembly of claim 24, filled with a carbonated beverage.

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