Method of making an open can end with high pressure venting
View Patent ↗An improved convenience closure that is adapted for sealing an end of a can includes an end panel having a peripheral score, a rivet formation, a mustache score and a flex line score defined therein. The mustache score may include a central portion that is positioned radially inwardly on the end panel relative to the rivet formation. The central portion is preferably curved, with a concave side of the curvature facing the rivet formation. The mustache score also may include first and second preferably symmetrical end portions, each of which is continuous with the central portion. Most of the total length of each of the end portions may be curved away from a nearest portion of the peripheral score, with a convex side of curvature facing the nearest portion of the peripheral score. Tooling for making the convenience closure and a method of making such a convenience disclosure are also disclosed.
1. A method of making a convenience closure, comprising:
providing an end panel;
forming a curved mustache score in said end panel;
forming a flex line score in said end panel adjacent to said mustache score, said flex line score having a first linear portion and a first curved portion;
forming a first break line score extending between and contacting both the first linear portion and the mustache score, further wherein the first break line score is perpendicular to the first linear portion; and
wherein the mustache score is located more radially inwardly on the end panel than said first curved portion.
2. A method according to claim 1 , further comprising forming a rivet formation in said end panel, and wherein said flex line score is adjacent to said rivet formation.
3. A method according to claim 2 , wherein said flex line score is defined along a flex line score axis, and wherein said flex line score axis intersects said rivet formation.
4. A method according to claim 1 , wherein said end panel has a diametric axis of symmetry, and wherein said first linear portion of said flex line score is substantially perpendicular to said diametric axis of symmetry.
5. A method according to claim 1 , wherein said first linear portion is located on a first side of a rivet formation and a second linear portion is located on a second, opposite side of said rivet formation.
6. A method according to claim 1 , wherein said first linear portion of said flex line score is located proximate to a rivet formation.
7. A method according to claim 6 , wherein said first curved portion of said flex line score is located distal to said rivet formation.
8. A method according to claim 1 , wherein said first curved portion of said flex line score is curved toward said mustache score.
9. A method of making a convenience closure, comprising:
providing an end panel;
forming a rivet formation in said end panel;
forming a mustache score in said end panel, wherein said mustache score has a central portion positioned radially inwardly on the end panel relative to the rivet formation; and
forming a flex line score in said end panel adjacent to said rivet formation, said flex line score having a first linear portion and a first curved portion; and
forming a first break line score extending between and contacting both the first linear portion and the mustache score, further wherein the first break line score is score perpendicular to the first linear portion.
10. A method according to claim 9 , wherein said flex line score is defined along a flex line score axis, and wherein said flex line score axis intersects said rivet formation.
11. A method according to claim 9 , wherein said end panel has a diametric axis of symmetry, and wherein said first linear portion of said flex line score is substantially perpendicular to said diametric axis of symmetry.
12. A method according to claim 9 , wherein said first linear portion is located on a first side of said rivet formation and a second linear portion is located on a second, opposite side of said rivet formation.
13. A method according to claim 9 , wherein said first linear portion of said flex line score is located proximate to said rivet formation.
14. A method according to claim 13 , wherein said first curved portion of said flex line score is located distal to said rivet formation.
15. A method according to claim 9 , wherein said first curved portion of said flex line score is curved toward said mustache score.
16. The method of claim 1 , further comprising second break line score, wherein said second break line score is parallel to said first break line score.
17. The method of claim 1 , wherein said mustache score further comprises a first end portion which is closest to said flex line score, wherein and said first break line score is aligned with said first end portion.
18. The method of claim 9 , further comprising second break line score, wherein said second break line score is parallel to said first break line score.
19. The method of claim 9 , wherein said mustache score further comprises a first end portion which is closest to said flex line score, wherein and said first break line score is aligned with said first end portion.