Can end and related methods
By forming an annular bend in the short wall of the can lid and then reforming the countersunk hole, the strength and rigidity issues of the can lid under pressure and pasteurization conditions are solved, achieving improved cost-effectiveness and failure prevention, and making it suitable for beverage containers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ALDAG METAL PACKAGING AMERICA INC
- Filing Date
- 2025-10-21
- Publication Date
- 2026-06-23
AI Technical Summary
Existing can lids, when subjected to pressurization and pasteurization, cannot improve strength and rigidity by reducing metal dimensions, leading to opening failures and leakage risks. Furthermore, traditional embossing methods increase manufacturing costs and complexity.
By forming an annular recess or bend in the short wall between the center panel of the can lid and the countersunk hole, and by reshaping the countersunk hole to avoid the stamping process, the bending strength and rigidity of the can lid are improved by combining the annular bend and the reshaped countersunk hole.
Without increasing the metal specifications, the bending strength and rigidity of the can lid are improved, manufacturing costs are reduced, opening failures during pasteurization and transportation are prevented, and the safety of the contents is ensured.
Smart Images
Figure CN122270355A_ABST
Abstract
Description
[0001] Related applications
[0002] This application claims priority to Provisional Patent Application No. 63 / 710,960, filed October 23, 2024, entitled “Can Lid and Related Method”. The entire contents of U.S. Provisional Patent Application Serial No. 63 / 710,960 are hereby incorporated by reference. Priority to U.S. Provisional Patent Application Serial No. 63 / 710,960 is hereby claimed. Technical Field
[0003] This disclosure relates generally to can lids, and more specifically to can lids and related methods. Background Technology
[0004] To reduce manufacturing or material costs, beverage container and can manufacturers have been working to reduce the amount of material (e.g., metal specification) used to manufacture pull tabs, lids, and / or can bodies. However, reducing material volume (e.g., reducing metal specification) may affect (e.g., reduce) the strength properties of pull tabs, lids, and / or can bodies. Attached Figure Description
[0005] Figure 1 This is a perspective view of an exemplary container with a lid, based on the teachings of this disclosure.
[0006] Figure 2A yes Figure 1 A perspective view of an exemplary can lid.
[0007] Figure 2B yes Figure 2A A cross-sectional view of an exemplary tank.
[0008] Figure 3A yes Figure 1 , Figure 2A and Figure 2B A partial cross-sectional view of an exemplary can lid.
[0009] Figure 3B yes Figure 3A An enlarged portion of an exemplary can lid.
[0010] Figure 4 This is a cross-sectional view of an exemplary tank shell disclosed herein.
[0011] Figure 5 This is an exemplary manufacturing process that can be used to manufacture the exemplary can lids disclosed herein.
[0012] Figure 6A yes Figure 5 A block diagram of an exemplary manufacturing process and an exemplary conversion process.
[0013] Figure 6B yes Figure 6AA partial perspective view of an exemplary conversion station in an exemplary conversion process.
[0014] Figure 7 yes Figure 6A and Figure 6B An enlarged partial view of an exemplary first conversion station in an exemplary conversion process.
[0015] Figure 8 yes Figure 6A and Figure 6B An enlarged partial view of an exemplary second conversion station in an exemplary conversion process.
[0016] Figure 9 This is an exemplary flowchart of an exemplary method for manufacturing the exemplary can lid disclosed herein.
[0017] Figure 10 This is a partial cross-sectional view of the exemplary tank shell disclosed herein.
[0018] Figure 11 This is a partial cross-sectional view of the exemplary can lid disclosed herein.
[0019] The accompanying drawings are not drawn to scale. Instead, to clarify multiple layers and regions, the thickness of the layers may be enlarged in the drawings. Where possible, the same reference numerals will be used throughout the drawings and the accompanying written description to refer to the same or similar parts. As used in this patent, stating that any part (e.g., layer, film, region, or plate) is positioned in any way on (e.g., positioned on, located on, arranged on, or formed on, etc.) another part indicates that: the mentioned part is in contact with the other part; or that the mentioned part is above the other part, wherein one or more intermediate parts are located therebetween. A statement that any part is in contact with another part means that: there are no intermediate parts between the two parts. A statement that a part is joined or connected to another part indicates that: the parts are engaged directly or through one or more intermediate parts. Therefore, physical contact is not necessary for joining or connecting two parts. Detailed Implementation
[0020] Beverage containers use easy-open lids. Easy-open lids typically consist of a tear-off or open panel and an attached lever-operated pull tab. This pull tab is used to push the tear-off panel into the container to open the lid and access the contents (e.g., liquid) stored within. To open the lid, the lever pull tab displaces the tear-off panel of the lid. Specifically, after the pull tab is used to open the tear-off panel, both the tear-off panel and the pull tab remain attached to the lid. Such known lids are often referred to as “ecological” or “pull-tab-on” (SOT) lids. The lid is formed through a process in which a thin metal disc is first formed with a cut edge, from which a shell or blank lid is formed, and the shell is converted into a lid closure that engages with the can body or container.
[0021] Throughout the use of such can lids, manufacturers attempt to save on metal costs by reducing the amount of metal used. Beverage containers are mass-produced, so even small reductions in the amount of material used per container can result in significant cost savings. However, can lids may be subjected to different stresses or conditions depending on the contents of the container. For example, when used with containers containing pressurized and / or pasteurized contents, can lids may be subjected to increased stresses. For instance, internal pressure in the container can cause the can lid to arch or bulge upwards in the center portion, and the pull ring to rise slightly due to the axial upward force acting on the can lid. If the pull ring extends upwards over the seam (or “convex edge structure”) of the can lid, the pull ring may disengage in the conveying system, leading to tipping and / or jamming. In some cases, the pull ring can also cause the can lid’s notches to crack or burst, resulting in leakage of the container’s contents (e.g., during transport). When the pressure in the container decreases or relaxes (e.g., decreases), the can lid will flatten, causing the pull ring to retract below the rim or seam. This condition is commonly referred to as an "opening" failure when the container's temperature and / or pressure increase or reach a steady state and the pull tab remains above the rim and does not retract below it. Opening failures can lead to leakage during transport because vibrations to the pull tab will eventually cause the tear strip to crack or burst (e.g., due to poor transport). Therefore, when containers are filled with carbonated beverages or beverages that require pasteurization at high temperatures, the lid must have considerable flexural strength (e.g., approximately 90 pounds per square inch (psi)) to withstand pressurized beverages and rock pressure to withstand poor transport and / or tear strip leakage. The higher the rock pressure, the greater the amount of pressure the lid can withstand. These conditions limit the amount of size reduction that can lids can have and make it difficult to alter the lid's design characteristics, for example, by reducing the metal specification or the thickness of the metal residue in the tear strip defining the tear panel. Reducing the lid specification in this case would result in the tear panel cracking during transport and / or failing to tear open during user opening.
[0022] Therefore, beverage container manufacturers often use different can lids for different conditions and / or contents. For example, can lids used for pressurized and / or pasteurized contents have a larger metal gauge (e.g., a thicker gauge) than can lids used for unpressurized (e.g., uncarbonated) contents and / or pressurized contents that have not been pasteurized. The larger metal gauge improves the performance of the can lid by enhancing its stiffness characteristics and / or strength. For example, manufacturers typically use a first can lid (e.g., the B64 can lid) for pressurized and / or pasteurized contents and a second can lid (e.g., the CDL can lid) for unpressurized and / or non-pasteurized contents.
[0023] B64 can lids offer greater performance capabilities than CDL can lids because the upward dimension of the metal thickness increases the lid's strength and rigidity. For example, B64 can lids typically include a dimension thickness of approximately 0.0085 inches, while CDL can lids typically include dimension thicknesses of approximately 0.0082 inches and 0.0080 inches. Additionally, B64 can lids are typically reshaped to harden the lid and improve performance characteristics. Therefore, B64 can lids can hold pressurized contents and allow for the pasteurization of pressurized contents. Typically, B64 can lids can be used with liquids (e.g., beer, juice, and / or milk) that undergo relatively high temperatures (e.g., 212 degrees Fahrenheit) during pasteurization. Conversely, CDL can lids can be used with unpressurized contents or pressurized contents that do not require pasteurization. Because CDL can lids do not require increased rigidity and / or strength, they can be made with smaller dimensions of metal, and CDL can lids can be manufactured without reshaping. Historically, CDL can lids were not used with containers holding liquids that require pasteurization (such as beer, juice, or milk) because CDL can lids could not withstand the stress caused by pressurized contents undergoing pasteurization and / or poor transport of pasteurized beverage containers.
[0024] CDL can lids are manufactured in various sizes from 200 to 211 (using conventional can manufacturer terminology). Example can lids disclosed herein may be size 209 (6.509 cm); size 207.5 (6.271 cm); size 206 (6.033 cm); size 204 (5.715 cm); size 202 (5.398 cm); size 200 (5.080 cm); and / or any other size. For example, size 202 can lids for soft drinks are an industry standard (e.g., in the US and Europe). Currently, there is industrial pressure to reduce all size 206 can lids to size 202. Therefore, can lids with continuously smaller diameter caps are produced to provide cost savings through lighter weight.
[0025] The exemplary can lids and related methods disclosed herein increase can lid performance (e.g., flexural strength and stiffness of CDL can lids) without increasing the metal and / or can lid specifications and / or can lid diameter. Specifically, the exemplary can lids and related methods disclosed herein improve can lid performance to enable the can lids to be used with pressurized contents requiring pasteurization. To improve performance, the can lids and related methods disclosed herein improve the stiffness and / or strength (e.g., flexural strength) of the can lids to prevent can lid bending during pasteurization and / or poor transport after pasteurization. To reduce costs, the exemplary can lids and related methods disclosed herein have reduced metal specifications or thicknesses of approximately 0.008 inches to 0.0082 inches. Some exemplary can lids disclosed herein may have metal specifications or thicknesses of approximately 0.0078 inches or less.
[0026] The exemplary methods disclosed herein include an annular recess or bend (e.g., a kink) in a short wall (e.g., a transition wall) of the can lid between the center panel of the can lid and the countersunk hole of the can lid. Additionally, the exemplary methods disclosed herein reshape the countersunk hole after forming the annular bend to improve the performance characteristics of the exemplary can lid. The exemplary annular bend and the reshaped countersunk hole are generated during a conversion process. Specifically, each feature is formed at a different station in the conversion process. For example, the annular bend is formed before the notch is formed. In some examples, the countersunk hole may be reshaped before or after the annular bend is formed. In some examples, the annular bend may be formed, and the countersunk hole may be reshaped simultaneously.
[0027] Furthermore, embossing features and / or embossed material are often added to can lids to strengthen the lid's radius and / or improve its bending properties. As used herein, "embossing" refers to the cold working of metal in the embossed area to strengthen the panel walls and / or panel radius (e.g., increasing the surface area of the embossed surface), thereby improving the can lid's bending performance or properties (e.g., making the can lid more resistant to bending). However, embossing increases the amount of press pressure or force (e.g., tonnage) required to deform the material. Therefore, embossing typically requires a higher tonnage press than, for example, a press used for stamping, because the workpiece is elastically deformable and not actually cut. Moreover, controlling the tolerances of embossing is more difficult because embossing often results in relatively large tolerances and is frequently used in applications where high precision is not critical. For example, embossing can be controlled to one-hundredth of an inch (0.01 inch). Therefore, for tight tolerance applications (e.g., applications requiring tolerance control of one-thousandth of an inch (0.001 inch), the control precision of the thickness provided by embossing may be difficult to control.
[0028] The exemplary can lids and related methods disclosed herein improve the performance of can lids without employing embossing processes or features on the inclined or plate-like walls of the can lid (e.g., without cold working the plate-like walls of the can lid). For example, the embossing material of the can lid can significantly increase manufacturing costs and / or complexity. Specifically, embossing operations require significant pressure and / or additional tools and / or presses, which can significantly increase manufacturing and / or maintenance costs. In some cases, embossing produces loose or brittle metal, which is undesirable.
[0029] To limit or prevent wrinkling and / or improve bending characteristics, the exemplary can lids disclosed herein form a bend (e.g., annular bend, kink, or concave arc) along the outer surface of the wall between the countersunk hole wall and the center panel. The bend is formed without embossing the wall between the center panel and the countersunk hole and / or the can lid. To avoid wrinkling and / or other material defects during conversion without embossing, the exemplary can lids and related methods disclosed herein form the annular bend and the reshaped countersunk hole separately. In other words, the exemplary methods disclosed herein employ a two-step manufacturing process to form the bend (e.g., annular bend) in the wall between the center panel and the countersunk hole and to reshape the countersunk hole. To avoid interference with scoring, the bend is formed before scoring. In this way, the formation of the bend does not interfere with scoring. For example, forming the bend after scoring can cause a portion of the scoring to break because the material of the can lid and / or wall can elongate during the formation of the bend. Additionally, to avoid stress and / or wrinkling on the wall portion, the countersunk hole is reshaped separately from the formation of the bend (e.g., the countersunk hole is formed before or after the bend is formed). This can be achieved, for example, in a separate press or process. The exemplary method disclosed herein employs a two-step process to enable the formation of the bend and the reshaped countersunk hole, without having to press the can lid to form the bend and / or reshape the countersunk hole.
[0030] Figure 1This is a perspective view of an exemplary beverage container 100 having an exemplary can lid 102, in accordance with the teachings of this disclosure. The can lid 102 of the illustrated example is coupled to a container or can body 104 to enclose the contents within the can body 104. The contents of the beverage container 100 may include liquids, including but not limited to beer, juice, carbonated liquids, milk, pasteurized liquids, pressurized liquids, and / or other liquids. Therefore, the contents of the beverage container 100 may be pressurized and / or pasteurized. In some examples, the can lid 102 may withstand pasteurization temperatures, for example, up to 200 degrees Fahrenheit (e.g., between 160 and 180 degrees Fahrenheit). Additionally, the can lid 102 of the illustrated example provides improved flexural strength (e.g., approximately 90 pounds per square inch (psi)) for CDL-type can lids with improved performance capabilities. For example, the can lid 102 may provide rock pressure capability greater than 30 pounds per square inch (psi) (e.g., between 33 and 35 psi). The can lid 102 shown in the example is a CDL202 can lid. For example, the can lid 102 shown in the example is made of a can shell (e.g., Figure 4 The can shell 400 is made of a material having a cut edge or diameter of approximately 2.7262 inches and a specification between approximately 0.0080 inches and 0.0082 inches. In some examples, the specification may be between approximately 0.0075 and 0.0085 (e.g., 0.0078). However, the can lid 102 in the example shown may be any other CDL can number, including, for example, can lid 204, can lid 206, can lid 208, and / or any other CDL can lid number.
[0031] Figure 2A yes Figure 1 A perspective view of an exemplary can lid 102. Figure 2B yes Figure 2A A cross-sectional view of an exemplary can lid 102. (Refer to...) Figure 2A and Figure 2B The can lid 102 shown in the example has a common side 200a and a product side 200b, when connected to Figure 1 When the can body 104 is in the form of a can, the product side 200b is opposite to the common side 200a. The can lid 102 of the example shown has a center panel 202, which is separated from the seam crease 204 by a circumferential wall 206. The seam crease 204 of the example shown defines the outer periphery of the can lid 102 (e.g., the CDL 202 can lid). The seam crease 204 of the example shown is generally oriented around a central axis 208 (… Figure 2A Centered on ), the can lid 102 of the example shown is joined to the seam cuff 204. Figure 1 The can body is 104.
[0032] The center panel 202 of the illustrated example includes a recessed panel 210. The recessed panel 210 is recessed relative to the surface 212 of the center panel 202. To provide a pouring opening, the can lid 102 of the illustrated example includes a pouring panel 214. The recessed panel 210 surrounds the pouring panel 214. The recessed panel 210 increases the relative stiffness of the pouring panel 214, thereby improving the openability of the pouring panel 214. In some examples, the can lid disclosed herein may not include the recessed panel 210. The pouring panel 214 of the illustrated example is defined by a breakable notch 216 and a fracture-resistant notch 218. The pouring panel 214 of the illustrated example can be cut from the center panel 202 by the breakable notch 216 and moved at an angle relative to the center panel 202, while the pouring panel 214 remains connected to the center panel 202 by a hinge 220. The movement of the pouring panel 214 relative to the center panel 202 provides a pouring opening for the can lid 102. To open or move the tipping panel 214 relative to the center panel 202, the can lid 102 of the illustrated example includes a pull ring 222. The pull ring 222 is located in a recessed panel 210. The pull ring 222 of the illustrated example is pivotally and / or rotatably coupled to the center panel 202 via a rivet 224 (e.g., rotating about the longitudinal axis of the rivet). The pull ring 222 of the illustrated example extends at least partially on the tipping panel 214.
[0033] Reference Figure 2B The circumferential wall 206 of the illustrated can lid 102 includes a crown 230, a chuck wall 232, and a reshaped countersunk hole 234. An inclined panel wall 236 (e.g., an inclined transition wall) connects the circumferential wall 206 and the center panel 202. The chuck wall 232 connects the crown 230 and the countersunk hole 234 (e.g., positioned between the crown 230 and the countersunk hole 234), and the inclined panel wall 236 connects the reshaped countersunk hole 234 and the center panel 202 (e.g., positioned between the reshaped countersunk hole 234 and the center panel 202). The crown 230 of the illustrated example defines a seam curl 204. To improve the performance of the can lid 102 (e.g., to increase bending strength and / or stiffness), the illustrated can lid 102 includes an annular bend 240 (e.g., kink, curl, indentation, deformation, etc.). Specifically, the annular bend 240 is formed together with the inclined panel wall 236. In the example shown, the annular bend 240 is positioned between the reshaped countersunk hole 234 and the center panel 202. Furthermore, as described in more detail below, the reshaped countersunk hole 234 is reshaped to improve material hardness properties and / or improve strength.
[0034] Figure 3A yes Figure 1 , Figure 2A and Figure 2B A partial sectional view of the can lid. Figure 3B yes Figure 3A A magnified view of a portion of the image. Figure 3A and Figure 3B The can lid does not include pull ring 222, rivet 224, recessed panel 210, tilting panel 214, scoring 216, 218 and / or Figure 2A and Figure 2B Other features of the can lid 102 are designed to improve clarity. See also Figure 3A and Figure 3B The crown 230 shown in the example includes an outer crown wall 302 and an inner crown wall 304. The chuck wall 232 includes an upper chuck wall portion 306 and a lower chuck wall portion 308. The upper chuck wall portion 306 is connected to the inner crown wall 304. The reshaped countersunk bore 234 includes an outer countersunk bore wall 310 and an inner countersunk bore wall 312. The outer countersunk bore wall 310 is connected to the lower chuck wall portion 308. The inner countersunk bore wall 312 is connected to the inclined panel wall 236. The inclined panel wall 236 is connected to the center panel 202. The inclined panel wall 236 extends at an angle 314 relative to the vertical plane 316. For example, the angle 314 in the example shown is approximately between 30 degrees and 60 degrees (e.g., 45 degrees). An annular bend 240 is formed in the inclined panel wall 236, located between a first end 318 of the adjacent reshaped countersunk hole 234 and a second end 320 of the adjacent center panel 202 of the inclined panel wall 236. The annular bend 240 forms a concave shape or channel oriented toward the common side 200a of the can lid 102 and a convex shape oriented toward the product side 200b of the can lid 102. The annular bend 240 has a first radius of curvature R1. For example, the first radius of curvature R1 may be between approximately 0.01 inches and 0.02 inches (e.g., 0.015 inches). The inclined panel wall 236 includes a second radius of curvature R2 that transitions between the countersunk hole 234 and the inclined panel wall 236, and a third radius of curvature R3 that transitions between the inclined panel wall 236 and the center panel 202. In the example shown, the second radius of curvature R2 and the third radius of curvature R3 are between approximately 0.015 inches and 0.03 inches (e.g., 0.020 inches). An annular bend 240 forms or defines a first protrusion 322 and a second protrusion 324. The first protrusion 322 is formed between the inner countersunk hole walls 312 of the annular bend 240, and the second protrusion 324 is formed between the annular bend 240 and the center panel 202. Therefore, the inclined panel wall 236 provides a transition wall between the countersunk hole 234 and the center panel 202, having the first protrusion 322, a concave bend provided by the annular bend 240, and a second protrusion 324, oriented toward the common side 200a (e.g., the first concave bend, the convex bend, and the second concave bend, as viewed from the product side 200b).
[0035] The outer countersunk hole wall 310 (e.g., the first arcuate portion) has a third radius of curvature R3, and the inner countersunk hole wall 312 (e.g., the second arcuate portion) has a fourth radius of curvature R4. In the example shown, the third radius of curvature R3 is approximately 0.005 inches, and the fourth radius of curvature R4 is approximately 0.018 inches. The outer countersunk hole wall 310 and / or the lower chuck wall portion 308 extend at an angle 314 relative to the vertical surface 316. Specifically, the angle 326 can be approximately between 8 and 15 degrees (e.g., 9 degrees). The can lid 102 in the example shown has a countersunk hole depth H1 (e.g., between the crown 230 and the reshaped countersunk hole 234) and a panel depth H2 (e.g., between the inner surface 328 of the central panel 202 and the lower surface of the reshaped countersunk hole 234). In the example shown, the countersunk hole depth H1 is approximately 0.236 inches, and the panel depth H2 is approximately 0.081 inches. As described in more detail below, the annular bend 240 is formed during the conversion process. In other words, during the formation of the tank shell (e.g., Figure 4 After the can shell 400 is formed, the annular bend 240 is formed as a secondary operation. Additionally, the reshaped countersunk hole 234 is reshaped during the conversion process. The reshaped countersunk hole 234 improves the performance and / or durability of the can lid.
[0036] Figure 4 This is a partial cross-sectional view of the can shell 400 disclosed herein. The can shell 400 of the example shown is a single-piece shell formed from a substantially circular blank of metal or aluminum sheet, preferably having a thickness or specification 402 between about 0.0075 inches and 0.0085 inches (e.g., 0.0078, 0.0080, 0.0082). Figure 4 The tank shell 400 is formed in Figure 3A and Figure 3B The can lid 102 shown is formed prior to this process. In other words, the can lid 102 is formed by a conversion process after the can shell 400 is formed by a shell press. The can shell 400 of the example shown includes a crown 230, a chuck wall 232, a countersunk hole 404, an inclined panel wall 406, and a center panel 202. The countersunk hole 404 is not re-formed. Instead, the countersunk hole 404 of the can shell 400 is freely formed during the formation of the can shell 400. Additionally, the can shell 400 of the example shown includes an inclined panel wall 406, which does not include... Figure 1 , Figure 2A , Figure 2B , Figure 3A and Figure 3BThe annular bend 240. The can shell 400 includes dimensions substantially similar to those of the can lid 102. For example, the angle 326 is approximately between 8 and 15 degrees (e.g., 9 degrees). Additionally, the second radius of curvature R2 and the third radius of curvature R3 are approximately between 0.015 inches and 0.03 inches (e.g., 0.020 inches). The angle 314 of the inclined panel wall 406 is approximately between 30 and 60 degrees (e.g., 45 degrees). As described above, the countersunk hole 404 of the can shell 400 is not reshaped. Therefore, the outer countersunk hole wall 408 of the countersunk hole 404 has a radius of curvature S1, and the inner countersunk hole wall 410 has a radius of curvature S2. The outer countersunk hole wall 408 corresponds to Figure 3A and Figure 3B The outer countersunk hole wall 310 and the inner countersunk hole wall 410 correspond to Figure 3A and Figure 3B The inner countersunk hole wall 312 of the can shell 400 has a radius of curvature S1 that differs from the first radius of curvature R1 of the outer countersunk hole wall 310, and a radius of curvature S2 that differs from the second radius of curvature R2 of the inner countersunk hole wall 312 of the can lid 102. For example, the radius of curvature S1 is approximately 0.010 inches, and the radius of curvature S2 is approximately 0.025 inches. Additionally, the can shell 400 has a countersunk hole depth HS1 and a panel depth HS2. The countersunk hole depth HS1 and panel depth HS2 of the can shell 400 differ from the countersunk hole depth H1 and panel depth H2 of the can lid 102. For example, in the example shown, the countersunk hole depth HS1 could be approximately 0.243 inches, and the panel depth HS2 could be approximately 0.078 inches.
[0037] Figure 5This is a block diagram of an exemplary manufacturing process 500 for manufacturing the can lid 102 disclosed herein. Manufacturing process 500 includes a shell press 502, a rotary crimper 504, a composite liner 506, and a conversion process 508. The shell press 502 of the illustrated example receives a disc or blank cut from a sheet coil (e.g., aluminum). Thus, in some examples, manufacturing process 500 may include a disc press for cutting disc-shaped blanks from sheet coils. The disc may have a diameter and specification thickness corresponding to the diameter of the can lid to be formed. For example, a blank disc for forming a B64 can lid may have a disc diameter of approximately 2.85 inches and a specification thickness of approximately 0.00865 inches. Conversely, a blank disc for a CDL can lid disclosed herein may have a disc diameter of approximately 2.7262 inches and a specification thickness of approximately 0.0080 inches or 0.0082 inches. In some examples, the specification thickness may be 0.0078 inches. For example, to form the CDL 202 can lid disclosed herein, the disc is a flat, round blank having a cut edge diameter of approximately 2.7262 inches and a thickness or specification of 0.0080 inches or 0.0082 inches. In some examples, the specification may be 0.0075 inches, 0.0078 inches, 0.0085 inches, and / or any other specification. The shell press 502 forms the can shell 400 as a one-piece shell, which is formed from a substantially round blank of sheet metal or aluminum. For example, the shell press 502 produces from the blank disc... Figure 4 The tank shell 400. Therefore, the shell press 502 forms the tank shell 400 having a crown 230, a chuck wall 232, a countersunk hole 404, an inclined panel wall 406, and a center panel 202. After forming the tank shell 400, a rotary crimper 504 forms or shapes a seam crimp 204 and / or an outer crown wall 302. Figure 3A The composite liner 506 adds the composite to the seam crimp 204 to attach it to the tank body 106. Figure 1 The conversion process 508 converts the can shell 400 into a can lid 102 for use with the can body 106.
[0038] Figure 6A yes Figure 5 A schematic diagram of an exemplary conversion press system 600 for an exemplary conversion process 508. Figure 6B yes Figure 6AA partial perspective view of an exemplary conversion press system. The conversion process 508 includes multiple presses or stations 602-616 to convert a can shell 400 into a can lid 102. For example, the illustrated conversion process 508 includes a first station 602, a second station 604, a third station 606, a fourth station 608, a fifth station 610, a sixth station 612, a seventh station 614, and an eighth station 616. In some examples, one or more of stations 602-616 may be combined into a single station. In some examples, one or more of stations 602-616 may be omitted (e.g., the eighth station). One or more of stations 602-616 include a press or a pair of molds for shaping and / or converting the can shell 400 into the can lid 102. For example, the first three stations 602-606 of the exemplary conversion process 508 form rivets 224 on the can lid 102 and provide an annular bend 240. To form rivet 224, the first station 602 of the illustrated example includes a first tool (e.g., a bubbling tool, a pair of molds) to form a bubble on the center panel 202 of the can housing 400. Specifically, the first station 602 deforms a portion of the center panel 202 along the central axis 208 such that the central portion of the center panel 202 partially bubbles relative to the other portions of the center panel 202 (e.g., surface 212) to a height of approximately between 0.073 inches and 0.085 inches. The second station 604 includes a second tool (e.g., a first striking tool) to partially strike the periphery or base of the bubble to shape and / or partially shape the bubble into the shape of the first rivet. For example, the second station 604 flattens the bubble to partially reduce the height of the rivet without breaking the center panel 202. The third station 606 includes a third tool (e.g., Figure 7A third tool 700 (e.g., a second striking tool, etc.) is used to further strike the periphery of the bubble / first rivet shape to complete the shape and / or forming of the rivet 224. Additionally, a third tool at the third station 606 deforms and / or shapes the panel wall 236. Specifically, the third tool at the third station 606 includes a tool (e.g., a mold) for adding an annular bend 240 to the panel wall 236. Thus, the annular bend 240 of the panel wall 236 is formed together with the rivet 224 (e.g., simultaneously or concurrently). Furthermore, the annular bend 240 is formed without imprinting the panel wall 236. In some examples, the annular bend 240 is formed separately from the rivet 224. The fourth station 608 includes a fourth tool (e.g., a scoring tool) to add breakable scoring 216 and anti-breakage scoring 218 to the can housing 400, thereby defining the pouring panel 214. Therefore, the formation of notches 216, 218 and / or the tilting panel 214 occurs after the formation of the annular bend 240. In this way, the addition of the annular bend 240 does not affect (e.g., interfere with or damage) the notches 216, 218 of the tilting panel 214. The fifth station 610 includes a fifth tool (e.g., a concave tool) to form the concave panel 210. The sixth station 612 includes a sixth tool (e.g., a piling tool) to piling the pull ring 222 to the rivet 224. The pull ring 222 is fed from a separate pull ring forming line 620 intersecting with the sixth station 612, such that the pull ring 222 is positioned above the rivet 224. The sixth tool of the sixth station 612 flattens the rivet 224 onto the pull ring 222 to secure the pull ring 222 to the center panel 202. The seventh station 614 includes a seventh tool (e.g., Figure 8 A seventh tool 800 (such as a reshaping tool, an ear removal tool, etc.) is used to reshape the countersunk hole 404 of the can body 400 and provide a reshaped countersunk hole 234 for the can lid 102. The reshaped countersunk hole 234 improves the flexural strength properties of the can lid 102. In some examples, the seventh station 614 may include an ear removal tool (e.g., in addition to or in combination with a reshaping tool) to remove or smooth the sharp edges of the pull tab 222. The eighth station 616 includes an eighth tool (e.g., a cutting tool) to mark or add markings to the can lid 102. After the eighth station 616, and after the can body 104 has been filled with contents or product, the can lid 102 may be attached to the can body 104.
[0039] In some examples, the annular bend 240 may be formed prior to the first station 602. In other words, an additional station with a third tool (e.g., without a riveting forming tool) may be added to the conversion process 508 to form the annular bend. Therefore, a separate or dedicated press may be added to the conversion process to provide the annular bend. In some examples, the annular bend 240 may be formed at the first station 602 and / or the second station 604. In some examples, the annular bend 240 is formed prior to the formation of the notches 216, 218. Additionally, the reshaped countersunk hole 234 may be formed at any station of the conversion process 508. For example, a reshaping station may be added... Figure 6A and Figure 6B The exemplary conversion process 508. In some examples, a countersunk hole 234 is provided in the forming prior to the formation of the annular bend 240. The exemplary conversion press system 600 shown does not employ an embossing machine and / or embossing tools typically required to add embossed features to the panel wall 236 associated with the annular bend 240. Eliminating the embossing tools or embossing machine significantly reduces manufacturing costs.
[0040] Figure 7 yes Figure 6A and Figure 6B A partially enlarged view of the third station 606. The third tool 700 of the third station 606 shown in the example includes a punch 702 and a die 704. The can shell 400 is positioned between the punch 702 and the die 704. The punch 702 includes a protruding nose 706 and a punch core 708. The punch core 708 includes a body 710 (e.g., a cylindrical body) and an annular flange 712 defining a cavity 714. The annular flange 712 is formed along and / or extends from the peripheral edge 716 of the body 710. The annular flange 712 has an arcuate surface 718 (e.g., a shoulder) whose shape is complementary to the shape of the annular bend 240 of the inclined panel wall 236. Specifically, the arcuate surface 718 of the example shown has a radius of curvature P1. The radius of curvature P1 of the example shown is different from the first radius of curvature R1 of the can lid 102. Figure 3A and Figure 3B The curvature is substantially similar (e.g., between approximately 1% and 5%). An arcuate surface 718 is formed along the inner surface or edge 719 of the annular flange 712. The cavity 714 of the illustrated example accommodates at least a portion of the central panel 202 of the tank shell 400 and / or the mold 704. A protruding nose 706 engages with the inner countersunk bore wall 312 to support the inner countersunk bore wall 312 when forming the annular bend 240. The protruding nose 706 has a shape complementary to the shape of the inner countersunk bore wall 312. For example, a portion of the protruding nose 706 has a radius of curvature substantially similar to or the same as that of the inner countersunk bore wall 312.
[0041] Mold 704 includes a mold core 720 having a support surface 722 (e.g., a horizontal surface), a side surface 724 (e.g., a vertical surface), and an inclined surface 726 (e.g., an inclined surface) between the support surface 722 and the side surface 724. The inclined surface 726 has an annular groove 728. The annular groove 728 defines a first protruding mold portion 730 and a second protruding mold portion 732. Therefore, the inclined surface 726 has a connection with the inclined panel wall 236 ( Figure 3A The shapes are complementary. Specifically, the inclined surface 726 of the die core 720 has an angle 734 relative to the vertical surface 316, which is between approximately 30 degrees and 60 degrees (e.g., 45 degrees). In operation, the punch 702 moves toward the die 704 to form an annular bend 240 to the inclined panel wall 236. Specifically, the arcuate surface 718 of the punch 702 engages with the inclined panel wall 236 to deflect, deform, or bend a portion of the inclined panel wall 236 engaged with the arcuate surface 718, forming the annular bend 240. In particular, a first protruding die portion 730 supports a first protrusion 322 of the inclined panel wall 236 between the inner countersunk hole wall 312 and the annular bend 240, and a second protruding die portion 732 supports a second protrusion 324 of the inclined panel wall 236 between the annular bend 240 and the center panel 202. The support surface 722 of the die core 720 supports or engages the center panel 202. Therefore, the annular bend 240 is formed without altering the dimensions of other components of the tank shell 400. For example, the second radius of curvature R2 and the third radius of curvature R3 of the inclined panel wall 236 remain unchanged during the formation of the annular bend 240.
[0042] Figure 8 yes Figure 6A and Figure 6BA partially enlarged view of the seventh station 614. The seventh tool 800 is a re-forming tool including a punch 802 and a die 804. The punch 802 in the example shown includes a punch core 806 and a punch nose 808. The die 804 includes a die core 810 and a die ring 812. The die ring 812 is spaced apart from the die core 810 by a distance to receive a countersunk hole 234 (e.g., the distance is slightly larger than the width of the countersunk hole 234). The die core 810 includes a support surface 814 (e.g., a horizontal surface), a side surface 816, and an inclined surface 818 connecting the support surface 814 and the side surface 816. The inclined surface 818 includes an annular groove 820 to at least partially receive and / or support an annular bend 240 of the inclined panel wall 236. The annular groove 820 defines a first protrusion 822 and a second protrusion 824. The first protruding portion 822 supports the first protruding portion 322 of the inclined panel wall 236, and the second protruding portion 824 supports the second protruding portion 324 of the inclined panel wall 236.
[0043] The punch core 806 includes a body 826 (e.g., a cylindrical body) and a flange 828, the flange 828 having an annular surface 829 (e.g., a shoulder) to support or engage an annular bend 240 of the inclined panel wall 236. The punch nose 808 has a shape complementary to the shape of the reshaped countersunk hole 234. For example, the punch nose 808 includes an end 830 having an outer wall 832 and an inner wall 834. The outer wall 832 and the inner wall 834 correspond to the outer countersunk hole wall 310 and the inner countersunk hole wall 312, respectively. Thus, the outer wall 832 includes a first arcuate portion or surface having a first radius of curvature T1, while the inner wall 834 includes a second arcuate portion or surface having a second radius of curvature T2. In the illustrated example, the first radius of curvature T1 of the punch nose 808 is substantially similar to or the same as the fourth radius of curvature R4 of the outer countersunk hole wall 310, while the second radius of curvature T2 of the punch nose 808 is substantially similar to or the same as the fifth radius of curvature R5 of the inner countersunk hole wall 312. During operation, the inclined panel wall 236 is supported by the inclined surface 818, while the center panel 202 is supported by the support surface 814. The punch core 806 is clamped between the annular bend 240 and the inclined panel wall 236 to prevent or limit deformation (e.g., dimensional changes) of the annular bend 240 and / or the inclined panel wall 236 during the reforming of the countersunk hole 234. With the center panel 202 and the inclined panel wall 236 clamped between the punch core 806 and the die core 810, the punch nose 808 reforms and / or deforms the countersunk hole 234 between the die ring 812 and the die core 810. Specifically, the punch nose 808 engages with the countersunk hole 234 from the common side 200a. The inner surface 840 of the die ring 812 has a shape complementary to a portion of the outer countersunk hole wall 310 and / or the lower chuck wall portion 308, and the side surface 816 of the die core 810 has a shape complementary to the inner countersunk hole wall 312. The die ring 812 and the die core 810 engage with the product side 200b of the can lid 102. Therefore, when the punch nose 808 pushes the countersunk hole 234 between the die ring 812 and the die core 810, the seventh tool 800 converts the countersunk hole 404 of the can shell 400 into a reshaped countersunk hole 234 of the can lid 102.
[0044] Figure 9 This is a flowchart of an exemplary method 900 for manufacturing the can lid 102 disclosed herein. Although in Figure 9 An exemplary method for manufacturing an exemplary can lid has been shown, but Figure 9 One or more of the steps and / or processes shown may be combined, divided, rearranged, omitted, eliminated, and / or implemented in any other way. Furthermore, Figure 9 The exemplary method 900 may include, except Figure 9 Other than or alternative to the processes and / or steps shown. Figure 9One or more of the processes and / or steps shown, and / or may include more than one of any or all of the processes and / or steps shown. Furthermore, although references... Figure 9 The flowchart shown illustrates an exemplary method 900, but alternatively, many other methods for manufacturing can lids can be used.
[0045] To begin Figure 9 An exemplary process is used to form rivets (frame 902) on the tank shell. For example, the tank shell 400 may be made of... Figure 5 The housing press 502 provides the housing. For example, the rivets 224 of the can lid 102 can be made by... Figure 6A and Figure 6B The exemplary conversion process 508 is formed by the first station 602, the second station 604, and the third station 606. During the rivet formation process, an annular rolled edge (frame 904) is formed on the panel wall. For example, in a process involving... Figure 6A and Figure 6B During the final imprinting process performed at the third station 606, the conversion process 508 may include a third tool 700 for forming an annular bend 240 on the tilted panel wall 236. In some examples, the annular bend 240 may be formed at the first station 602, the second station 604, and / or any other station before forming the notches 216, 218. After forming the annular bend, notches are formed on the center panel to provide a tilting panel (frame 906). For example, notches 216, 218 may be formed after forming the annular bend 240 via... Figure 6A and Figure 6B The fourth station 608 is formed on the center panel 202. After the notch is formed, a recessed panel (frame 908) is formed on the center panel, and the pull ring is pinned to the center panel (frame 910). For example, the recessed panel can be formed via the fifth station 610, and the pull ring 222 can be pinned to the center panel 202 via rivets 224 at the sixth station 612. In some examples, the recessed panel is not formed, so frame 910 can be omitted. After pinning the pull ring, the countersunk hole is reshaped (frame 912). For example, the countersunk hole 404 of the tank shell 400 can be reshaped at the seventh station 614. In some examples, after the countersunk hole is reshaped, a mark is added to the center panel 212 (frame 914). For example, it can be done via... Figure 6A and Figure 6BA mark is added at the eighth station 616. As described above, the exemplary method 900 does not employ an embossing operation. Therefore, in the exemplary method 900 disclosed herein, the annular bend 240 is formed and the countersunk hole 234 is reshaped, without embossing the can lid 202 between the countersunk hole 234 and the center panel 212 (e.g., the inclined panel wall 236). Additionally, the annular bend 240 and the reshaped countersunk hole 234 are formed in separate press and / or operations.
[0046] Figure 10 This is a partial cross-sectional view of an exemplary tank shell 1000 disclosed herein, which can be formed via a shell press 502 and via... Figure 5 The rotary hemming machine 504 is used for hemming the seams. All dimensions shown are in inches. The tank shell 1000 shown is... Figure 5 The can shell 1000 is formed before the conversion process 508. In other words, the can shell 1000 is formed by the shell press 502 before the annular bend 240 of the can lid 102 and the reshaped countersunk hole 234 are formed. In addition, the countersunk hole 404 has not yet been reshaped.
[0047] Figure 11 It is through Figure 5 The conversion process 508 is by Figure 10 A partial cross-sectional view of an exemplary can lid 1100 formed from the can housing 1000. All dimensions shown are in inches. In the example shown, an annular bend 240 is formed on the inclined panel wall 236, and the countersunk hole 234 is reshaped.
[0048] The terms “including” and “comprising” (and all their forms and tenses) are used herein as open-ended terms. Therefore, whenever a claim uses any form of “include” or “comprise” (e.g., comprises, includes, comprising, including, having, etc.) as a preamble or in any kind of claim statement, it should be understood that additional elements, terms, etc., may be present without falling outside the scope of the corresponding claim or statement. As used herein, when the phrase “at least” is used as a transitional term, for example, in the preamble of a claim, it is open-ended in the same way that the terms “comprising” and “including” are open-ended. When used, for example, in the form of A, B, and / or C, the term “and / or” refers to any combination or subset of A, B, C, such as (1) A alone, (2) B alone, (3) C alone, (4) A with B, (5) A with C, (6) B with C, or (7) A with B and with C. As used herein in the context of describing structures, components, items, objects, and / or things, the phrase “at least one of A and B” is intended to refer to an implementation in which (1) at least one A, (2) at least one B, or (3) any one of at least one A and at least one B. Similarly, as used herein in the context of describing structures, components, items, objects, and / or things, the phrase “at least one of A or B” is intended to refer to an implementation in which (1) at least one A, (2) at least one B, or (3) any one of at least one A and at least one B. As used herein in the context of describing the implementation or execution of processes, instructions, actions, activities, etc., the phrase “at least one of A and B” is intended to refer to an implementation in which (1) at least one A, (2) at least one B, or (3) any one of at least one A and at least one B. Similarly, as used herein in the context of describing the implementation or execution of processes, instructions, actions, activities, etc., the phrase “at least one of A or B” is intended to refer to an implementation in which (1) at least one A, (2) at least one B, or (3) any one of at least one A and at least one B.
[0049] As used herein, singular references (e.g., "a," "an," "first," "second," etc.) do not exclude multiple objects. As used herein, the term "a" or "an" refers to one or more of the same object. The terms "a" (or "an"), "one or more," and "at least one" are used interchangeably herein. Furthermore, although listed separately, multiple means, elements, or actions may be implemented by, for example, the same entity or object. Additionally, although individual features may be included in different examples or claims, these features may be combined, and inclusion in different examples or claims does not imply that the combination of features is infeasible and / or disadvantageous.
[0050] As used herein, unless otherwise stated, the term "above" describes the relationship of two parts relative to the Earth. The first part is above the second part if the second part has at least one portion between the Earth and the first part. Similarly, as used herein, the first part is "below" the second part when the first part is closer to the Earth than the second part. As stated above, the first part can be above or below the second part, provided that one or more of the following conditions exist: there are other parts between them, there are no other parts between them, the first and second parts are not in contact, or the first and second parts are not in direct contact with each other.
[0051] As used in this patent, the statement that any part (e.g., layer, film, region, area, or plate) is on another part in any way (e.g., positioned on another part, located on another part, disposed on another part, or formed on another part, etc.) indicates that the mentioned part is in contact with the other part or that the mentioned part is above the other part, wherein one or more intermediate parts are located between them.
[0052] As used herein, unless otherwise specified, a connection reference (e.g., attachment, coupling, connection, and engagement) may include intermediate components between elements referenced by the connection reference and / or relative movement between these elements. Similarly, a connection reference does not necessarily imply that two elements are directly connected and / or fixed to each other. As used herein, stating that any part is in “contact” with another part is defined to mean that there is no intermediate component between the two parts.
[0053] Unless otherwise expressly stated, descriptors such as “first,” “second,” “third,” etc., are used herein without implying or otherwise indicating any meaning of priority, physical order, arrangement in a list, and / or any sorting in any way, but merely as labels and / or arbitrary names to distinguish elements in order to facilitate understanding of the disclosed examples. In some examples, the descriptor “first” may be used to refer to an element in a detailed description, while the same element may be referred to in the claims by different descriptors such as “second” or “third.” In such cases, it should be understood that such descriptors are only used to clearly identify those elements in the context of the discussion (e.g., in the claims), in which the elements may otherwise share the same name, for example.
[0054] As used herein, “about” and “approximately” modify their subject / value to identify the potential presence of variations that occur in real-world applications. For example, as those skilled in the art will understand, “about” and “approximately” can modify dimensions that may be inaccurate due to manufacturing tolerances and / or other real-world defects. For example, “about” and “approximately” can indicate that such a dimension is within a tolerance of + / - 10%, unless otherwise specified herein.
[0055] As can be understood from the above, can lids and related methods for improving can lid performance have been disclosed. Other examples and combinations thereof include the following: Example 1 includes a method for forming a can lid, the method comprising: obtaining a shell having a center panel, a seam crease, a transition wall, and a countersunk hole, the seam crease being connected to the center panel through the countersunk hole, the countersunk hole having an outer wall and an inner wall, the outer wall being connected to the seam crease, the inner wall being connected to the transition wall, the transition wall connecting the center panel and the inner wall of the countersunk hole, the countersunk hole including a first arcuate transition portion and a second arcuate transition portion connecting the outer wall and the inner wall; forming a concave bend in the transition wall, the concave bend being positioned between the countersunk hole and the center panel; and reshaping the countersunk hole after forming the concave bend.
[0056] Example 2 includes the method of Example 1, wherein forming the concave bend comprises: pressing the transition wall between a first mold and a second mold, and wherein the formation of the concave bend occurs without pressing the panel wall.
[0057] Example 3 includes the method of any one of Examples 1 to 2, wherein forming the concave bend includes: forming the concave bend having a radius of curvature of about 0.01 inches and 0.02 inches.
[0058] Example 4 includes the method of any one of Examples 1 to 3, wherein the radius of curvature of the concave bend is about 0.015 inches.
[0059] Example 5 includes the method of any one of Examples 1 to 4, wherein forming the concave bend results in the transition wall having a first convex bend and a second convex bend, the first convex bend connecting the inner wall and the transition wall, the second convex bend connecting the transition wall and the center panel, and the concave bend being located between the first convex bend and the second convex bend.
[0060] Example 6 includes the method of any one of Examples 1 to 5, wherein the first convex bend has a first radius of curvature and the second convex bend has a second radius of curvature.
[0061] Example 7 includes the method of any one of Examples 1 to 6, wherein the first radius of curvature and the second radius of curvature are about 0.02 inches.
[0062] Example 8 includes the method of any one of Examples 1 to 7, wherein obtaining the housing includes: forming the countersunk hole having a first arcuate transition portion with a radius of curvature of about 0.01 inches and a second arcuate transition portion with a radius of curvature of about 0.25 inches.
[0063] Example 9 includes the method of any one of Examples 1 to 8, wherein reshaping the countersunk hole includes: reshaping the countersunk hole with a press to change the shape of the countersunk hole such that the first arcuate transition has a radius of curvature of about 0.005 inches and the second arcuate transition has a radius of curvature of about 0.018 inches.
[0064] Example 10 includes a method comprising: forming a housing via a housing press, the housing including a center panel, a seam crimp, a countersunk hole, and an inclined panel wall, the countersunk hole and the inclined panel wall connecting the center panel and the seam crimp, the countersunk hole including an outer wall and an inner wall connecting the seam crimp and the center panel, the countersunk hole including a first arcuate transition and a second arcuate transition connecting the outer wall and the inner wall; after forming the housing, forming a can lid from the housing using a conversion process, the can lid formation comprising: forming a rivet to the center portion; forming a concave bend in the inclined panel wall between the countersunk hole and the center panel; providing a breakable notch in the center panel; adding a pull ring to the center panel; and reshaping the countersunk hole, the reshaping of the countersunk hole altering a first radius of curvature of the first arcuate transition of the countersunk hole and a second radius of curvature of the second arcuate transition of the countersunk hole, the reshaping of the countersunk hole occurring separately from the formation of the concave bend.
[0065] Example 11 includes the method of Example 10, wherein the formation of the rivet and the formation of the concave bend occur simultaneously.
[0066] Example 12 includes the method of any one of Examples 10 to 11, the method further comprising: forming the concave bend in the inclined panel wall via a first mold and a first punch, the concave bend being formed prior to forming the brittle groove, and the corner wall not including an embossed feature.
[0067] Example 13 includes the method of any one of Examples 10 to 12, the method further comprising: reshaping the countersunk hole via a second mold and a second punch.
[0068] Example 14 includes the method of any one of Examples 10 to 13, wherein the second mold includes a mold core and a mold ring, the countersunk hole is received between the mold ring and the mold core, and the second punch includes an arcuate portion complementary to the shape of the concave bend to support the concave bend during the reforming of the countersunk hole.
[0069] Example 15 includes a can lid comprising a center panel, a seam crimp extending from the center panel, and a reshaped countersunk hole connecting the seam crimp and the center panel. The reshaped countersunk hole includes an outer wall and an inner wall. The outer wall engages with the seam crimp, and the inner wall engages with the center panel. A sloping panel wall engages with the inner wall of the countersunk hole and the center panel. A first bend is formed in the sloping panel wall between the countersunk hole and the center panel; the sloping panel wall does not include an embossing feature.
[0070] Example 16 includes the can lid of Example 15, wherein the reshaped countersunk hole includes a first arcuate portion and a second arcuate portion that transitions the outer wall and the inner wall.
[0071] Example 17 includes a can lid of any of Examples 15 to 16, wherein the first arcuate portion has a radius of curvature of about 0.005 inches and the second arcuate portion has a radius of curvature of about 0.018 inches.
[0072] Example 18 includes a can lid of any of Examples 15 to 17, wherein the first bend has a radius of curvature of about 0.15 inches.
[0073] Example 19 includes a can lid of any of Examples 15 to 18, wherein the outer wall of the reshaped countersunk hole has an angle of about 9 degrees relative to the vertical plane.
[0074] Example 20 includes a can lid of any of Examples 15 to 19, wherein the inclined panel wall has a first radius of curvature of about 0.02 inches between the inner wall of the countersunk hole and the first bend, the inclined panel wall has a second radius of curvature of about 0.02 inches between the first bend and the center panel, and the first bend has a radius of curvature of about 0.15 inches.
[0075] The appended claims are hereby incorporated by reference in the Detailed Description section. While certain exemplary systems, devices, articles of manufacture, and methods have been disclosed herein, the scope of this patent is not limited thereto. Rather, this patent covers all systems, devices, articles of manufacture, and methods that fall fully within the scope of the claims of this patent.
[0076] While certain exemplary methods, apparatuses, and articles of manufacture have been disclosed herein, the scope of this patent is not limited thereto. Rather, this patent covers all methods, apparatuses, and articles of manufacture that fall fully within the scope of the claims of this patent.
Claims
1. A method for forming a can lid, the method comprising: A housing is obtained, the housing having a center panel, a seam rolled edge, a transition wall, and a countersunk hole. The seam rolled edge is connected to the center panel through the countersunk hole. The countersunk hole has an outer wall and an inner wall. The outer wall is connected to the seam rolled edge, and the inner wall is connected to the transition wall. The transition wall connects the center panel and the inner wall of the countersunk hole. The countersunk hole includes a first arc-shaped transition portion and a second arc-shaped transition portion that connects the outer wall and the inner wall. A concave bend is formed in the transition wall, the concave bend being positioned between the countersunk hole and the center panel; and The countersunk hole is reshaped after the concave bend is formed.
2. The method according to claim 1, further comprising forming grooves on the can lid, wherein, The concave bend is formed before the groove is formed, and the concave bend is formed without pressing the panel wall.
3. The method according to claim 1, wherein, Forming the concave bend includes forming the concave bend having a radius of curvature between approximately 0.01 inches and 0.02 inches.
4. The method according to claim 3, wherein, The radius of curvature of the concave bend is approximately 0.015 inches.
5. The method according to claim 1, wherein, The formation of the concave bend results in the transition wall having a first convex bend and a second convex bend, the first convex bend connecting the inner wall and the transition wall, the second convex bend connecting the transition wall and the center panel, and the concave bend located between the first convex bend and the second convex bend.
6. The method according to claim 5, wherein, The first convex bend has a first radius of curvature, and the second convex bend has a second radius of curvature.
7. The method according to claim 6, wherein, The first radius of curvature and the second radius of curvature are approximately 0.02 inches.
8. The method according to claim 1, wherein, Obtaining the housing includes forming the countersunk hole, the countersunk hole having a first arcuate transition portion with a radius of curvature of about 0.01 inches and a second arcuate transition portion with a radius of curvature of about 0.25 inches.
9. The method according to claim 8, wherein, Reshaping the countersunk hole includes: reshaping the countersunk hole using a press to change the shape of the countersunk hole, such that the first arcuate transition portion has a radius of curvature of about 0.005 inches, and the second arcuate transition portion has a radius of curvature of about 0.018 inches.
10. A method, the method comprising: A housing is formed by a housing press. The housing includes a center panel, a seam rolled edge, a countersunk hole, and an inclined panel wall. The countersunk hole and the inclined panel wall connect the center panel and the seam rolled edge. The countersunk hole includes an outer wall and an inner wall that connect the seam rolled edge and the center panel. The countersunk hole also includes a first arc-shaped transition portion and a second arc-shaped transition portion that connect the outer wall and the inner wall. After the shell is formed, a conversion process is used to form a can lid from the shell, the can lid formation comprising: The rivet is formed into the central portion; A concave bend is formed in the inclined panel wall, the concave bend being between the countersunk hole and the center panel; A breakable groove is provided in the center panel; Add a pull ring to the center panel; and The countersunk hole is reshaped, which alters the first radius of curvature of the first arcuate transition portion and the second radius of curvature of the second arcuate transition portion of the countersunk hole. The reshaping of the countersunk hole occurs separately from the formation of the concave bend portion.
11. The method according to claim 10, wherein, The formation of the rivet and the formation of the concave bend occur simultaneously.
12. The method according to claim 10, further comprising: The concave bend is formed in the inclined panel wall via a first mold and a first punch. The concave bend is formed before the formation of the brittle groove, and the corner wall does not include an embossing feature.
13. The method according to claim 12, further comprising: The countersunk hole is reshaped using a second mold and a second punch.
14. The method according to claim 13, wherein, The second mold includes a mold core and a mold ring, the countersunk hole is received between the mold ring and the mold core, and the second punch includes an arcuate portion that is complementary to the shape of the concave bend to support the concave bend during the reforming process of the countersunk hole.
15. A can lid, the can lid comprising: Center panel; Seam curling, the seam curling extending from the center panel; A reshaped countersunk hole connects the seam crimp and the center panel. The reshaped countersunk hole includes an outer wall and an inner wall, the outer wall being engaged with the seam crimp and the inner wall being engaged with the center panel. Inclined panel wall, the inclined panel wall being joined to the inner wall of the countersunk hole and the center panel; and A first bend is formed in the inclined panel wall between the countersunk hole and the center panel, wherein the inclined panel wall does not include an embossing feature.
16. The can lid according to claim 15, wherein, The reshaped countersunk hole includes a first arcuate portion and a second arcuate portion that transition between the outer wall and the inner wall.
17. The can lid according to claim 16, wherein, The first arcuate portion has a radius of curvature of approximately 0.005 inches, and the second arcuate portion has a radius of curvature of approximately 0.018 inches.
18. The can lid according to claim 15, wherein, The first bend has a radius of curvature of approximately 0.15 inches.
19. The can lid according to claim 15, wherein, The outer wall of the reshaped countersunk hole has an angle of approximately 9 degrees relative to the vertical plane.
20. The can lid according to claim 15, wherein, The inclined panel wall has a first radius of curvature of about 0.02 inches between the inner wall of the countersunk hole and the first bend, the inclined panel wall has a second radius of curvature of about 0.02 inches between the first bend and the center panel, and the first bend has a radius of curvature of about 0.15 inches.