JP2013067419A - Can lid and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stay-on-tab-type can lid which is excellent in pressure resistance strength and formability without deteriorating openability and stackability even if its diameter is small.SOLUTION: A can lid includes a panel portion, a countersink, a panel deboss and a tab tail in the panel portion, and a tab fixed in the panel deboss. The panel deboss includes a recessed finger deboss formed between the tab tail of the tab and the countersink. The finger deboss includes a first deboss portion formed so that part of the panel deboss protrudes downward and second deboss portions formed on both sides in a nearly circumferential direction of the first deboss portion so that they protrude downward between the first deboss portion and the panel deboss and have a smaller depth from the panel deboss than the first deboss portion has. The width of the first deboss portion in the nearly circumferential direction is greater on the tab tail side and smaller on the countersink side.

Description

  The present invention relates to a can lid wound around an open end of a can body and a method for manufacturing the same.

  As a can lid of a beverage can, there is known a steion tab type that can open a drinking mouth with the tab attached to the panel of the can lid body. In the can lid with this tab, by pulling up the finger hook part of the tab attached by the rivet, the vicinity of the rivet is bent and becomes a fulcrum, and the tab nose part (the tip of the tab) becomes the action point, and the panel surface The opening piece surrounded by the score can be pressed and immersed to break the score, and the opening piece can be opened. At this time, the panel is broken along the score shape, but the opening piece is pushed into the beverage can without leaving the panel.

  In such a can lid, in order to facilitate finger-holding when lifting the finger-hook portion of the tab with the fingertip, a part of the finger enters from the vicinity of the lower portion of the tab-hook portion to the outer periphery of the panel. Finger hook recesses (finger debosses) are formed.

  In order to further improve the finger-holding property of the tab, it has been studied to make the finger-hanging recesses large and deep. However, if the finger-hanging recess is to be expanded in the radial direction of the can lid, the pressure resistance of the can lid may be reduced in the vicinity of the counter sink on the outer peripheral side. In addition, if you attempt to enlarge the finger hook recess so as to enter under the finger hook portion of the tab, the finger hook recess and the tab may be rubbed and damaged when stacking the can lid, or the stacking property may be impaired. There is a fear.

  On the other hand, when enlarging the finger-hanging recess in the circumferential direction of the can lid, if a sufficient depth is to be ensured, the moldability is poor and there is a risk of partial thinning. On the other hand, Patent Document 1 proposes to provide a shape in which a plurality of inclined surfaces are continuously provided around the finger-hanging recess to reduce the degree of bending and prevent damage during molding. ing.

  Moreover, in order to improve the finger-holding property of the tab, it is conceivable to increase the clearance between the panel and the tab by deepening the finger-holding concave portion. However, if the finger hook recess is too deep, when stacking and storing a plurality of can lids, the finger hook recess protruding on the back of the panel and the upper surface of the tab may be rubbed and scratched, or the stacking property may deteriorate. There is. On the other hand, in patent document 2, the finger hooking property is improved without making the finger hanging concave portion excessively deep by making the inclined surface of the finger hanging concave portion located under the tab relatively steep. Can lids have been proposed.

JP 2006-176147 A JP 2009-67407 A

  In such a beverage can, in recent years, for example, it is required to reduce the material cost by reducing the diameter of the can lid. However, in order to improve finger grip and facilitate opening, it is preferable to form finger hook recesses having a certain area and depth. In other words, if the can lid diameter is reduced, the region where the finger hook concave portion can be formed becomes small, so that it becomes difficult to form an enlarged finger hook concave portion as described in Patent Document 1. In addition, in the can lid as described in Patent Document 2, there is a possibility that it is difficult to open because the finger hook recess is small. Moreover, when the area | region of a finger hook recessed part is small, since it is desirable in order to prevent the fracture | rupture at the time of shaping | molding to make a depth small, there exists a problem that a finger | toe is hard to catch on a tab and openability falls.

  On the other hand, in the case of a small-diameter can lid, it is conceivable to make the tab itself small and widen the region where the finger hook recess can be formed. However, if the tab is too small, the can opening property may be deteriorated. Also, changing the shape and dimensions of the tab is not realistic because it requires a large capital investment. In addition, it is conceivable to improve the finger grip by raising the tab from the panel of the can lid or by forming the finger hook concave portion deeply. There is a possibility that the pressure strength and formability of the lid may be lowered.

  The present invention has been made in view of such circumstances, and provides a canister tab type can lid that is excellent in pressure strength and formability without impairing the opening and stacking properties even with a small diameter. For the purpose.

  The present invention includes a substantially disc-shaped panel portion and an annular counter sink provided on the outer peripheral portion of the panel portion, and includes a central portion in the panel portion and is located on the inner peripheral side of the counter sink. A can lid comprising a panel deboss formed by forming a concave portion, a score provided on the panel deboss to form an opening piece, and a tab fixed in the panel deboss by a rivet provided at the center of the panel portion It is. In this can lid, the tab has a tab tail located on the opposite side of the opening piece across the rivet, and the panel deboss has a further concave shape between the tab tail of the tab and the counter sink. Finger debosses are formed. The finger deboss has a first debossed portion formed so that a part of the panel deboss is convex downward, and is convex downward between the first debossed portion and the panel deboss. And second debossed portions formed on both sides of the first debossed portion in a substantially circumferential direction (tab width direction) so that the depth from the panel debossed portion is smaller than that of the first debossed portion. The substantially circumferential direction (tab width direction) width of the first debossed portion is wide on the tab tail side and narrow on the counter sink side.

  According to this can lid, since the finger debosses are formed so that the first debossed portion on the inside is deep and the second debossed portions on both sides are shallow, for example, the distance between the tab tail and the outer peripheral edge of the panel is about 4 to 6 mm. Even in a small-sized can lid, the openability can be improved without lowering the pressure strength. The first debossed portion of the can lid according to the present invention is formed so that the substantially circumferential width is wide on the tab tail side, but in order to round the corner portion so as not to be sharp, the width is slightly on the tab tail side. Smaller shapes are also included.

  That is, in order to improve the finger holdability, it is conceivable to form the finger debosses large and deep, but there is no room for forming large finger debosses in the small-diameter can lid. Further, if the small finger debosses are formed deeply, the lid member may be cut off at the time of formation. On the other hand, if the bend is not made to some extent, the spring back may occur and the desired shape may not be maintained in the finger debosses.

  On the other hand, in the can lid of the present invention, the shallow second debossed portions are formed on both sides in the substantially circumferential direction of the first debossed portion, so that the bottom portion and the second debossed portion of the small and deep first debossed portion are loosely formed. The panel debosses and the second debossed portion are connected in a shape that bends to some extent. In addition, there is no second debossed portion on both sides of the center line along the tab longitudinal direction of the first debossed portion, and the first debossed portion and the panel debossed or panel portion are connected to each other in the tab longitudinal direction of the finger debossed portion. The size along is kept small.

  Thus, according to the present invention, a can lid is realized that has deep finger debosses with sufficient shape rigidity, has improved openability, and is less likely to break the lid material during formation. In addition, according to this configuration, since there is a relatively large space on both sides in the substantially circumferential direction of the first debossed portion, it is possible to provide finger debosses that improve finger gripping even in a small-diameter can lid. is there.

  In this can lid, the finger debosses have a width along the longitudinal direction of the tab of 2.5 mm or more and 3.5 mm or less, and a substantially circumferential width at the center position of the width (width direction of the tab) of 8 mm or more and 12 mm or less. The substantially circumferential width of each of the second debossed portions is preferably 2.8 mm or more and 3.7 mm or less. In this case, for example, a suitable finger deboss is provided even in a small-sized can lid having a panel portion with a diameter of about 43.8 mm.

  In the can lid, the finger debosses may have a depth of 0.3 mm to 0.6 mm from the panel debosses of the first debossed portions, and a depth of the second debossed portions from the panel debosses of 0. 0 mm. It is preferable that it is 2 mm or more and 0.4 mm or less. In this case, for example, a suitable finger deboss is provided even in a small-sized can lid having a panel portion with a diameter of about 43.8 mm. In addition, the depth from the panel part of the panel deboss in this case is 0.4 mm-0.5 mm.

  The present invention also provides a method for manufacturing a can lid in which a tab is attached to a substantially disc-shaped panel portion, and a finger deboss for forming a finger on the tab is formed. The first debossed portion is formed by pushing down into a planar shape, and a substantially intermediate position between the first debossed portion and the panel portion is further pushed down in a dotted or linear manner during the formation of the first debossed portion. Thus, a second debossed portion shallower than the first debossed portion is formed between the panel portion and the first debossed portion.

  According to this can lid manufacturing method, even with a small finger deboss, the edge of the first debossed portion is gently bent by forming the second debossed portion between the first debossed portion and the panel portion. Therefore, it is possible to mold without breaking the deep first debossed portion. Moreover, since the edge of a panel part can be largely bent by forming a 2nd deboss, a spring back can be prevented and a finger deboss having high shape rigidity can be formed.

  According to the can lid of the present invention, it is possible to provide a steion tab type can lid having excellent pressure strength and moldability without impairing the can opening property and stacking property even if it has a small diameter.

It is the top view (a) which shows the can lid concerning this invention, and sectional drawing (b) which follows the II line | wire. It is the elements on larger scale which show the principal part of the can lid shown in FIG. It is sectional drawing which follows the II-II line of the can lid shown in FIG. It is a top view which shows a part of upper surface of a lower punch in the press metal mold | die used for the manufacturing method of the can lid concerning this invention. It is sectional drawing which follows the III-III line of the press die shown in FIG. It is sectional drawing which follows the III-III line of the metal mold | die shown in FIG. 4, and has shown the state which shape | molds a 1st debossing part. It is sectional drawing which follows the III-III line of the metal mold | die shown in FIG. 4, and has shown the state from which shaping | molding of a 2nd debossed part is started in the middle of shaping | molding of a 1st debossed part. It is sectional drawing which follows the III-III line of the metal mold | die shown in FIG. 4, and has shown the state which shape | molds a 1st debossed part and a 2nd debossed part.

  Hereinafter, embodiments of a can lid according to the present invention will be described with reference to the drawings. As shown in FIG. 1, a can lid 10 according to the present invention includes a substantially disc-shaped panel portion 20 and an annular counter sink provided so as to protrude downward along the outer peripheral portion of the panel portion 20. 40, and a panel deboss 25 formed by forming a part of the inner periphery side of the counter sink 40 in a concave shape including a central portion in the panel portion 20, and a score 22 provided on the panel deboss 25 to form an opening piece. And a tab 30 fixed in the panel deboss 25 by a rivet 23 provided at the center of the panel portion 20.

  As shown in FIG. 1A, in the can lid 10, the tab 30 sandwiches the rivet 23 with the tab tail 31 positioned on the opposite side of the opening piece 21 with the rivet 23 protruding from the upper surface of the panel portion 20 interposed therebetween. And the tab nose 32 located on the opening piece 21 on the opposite side. As shown in FIG. 1 (b), when the unfolder puts his finger F on the tab tail 31 and lifts the tab 30 away from the panel portion 20 (panel deboss 25), the tab nose 32 and the rivet 23. And the score 22 is cut, and the opening piece 21 is pushed down from the panel portion 20, whereby the can lid 10 is opened. The can lid 10 has a small diameter that can ensure a distance of about 4 to 6 mm (5 mm in the present embodiment) between the tab tail 31 and the counter sink 40.

  As shown in FIGS. 2 and 3, a part of the panel deboss 25 is further concaved between the tab tail 31 of the tab 30 and the counter sink 40, as shown in FIGS. 2 and 3. Finger debosses 50 are formed. The tab tail 31 is formed in a substantially linear shape, and the tab tail 31 side of the finger deboss 50 is formed in a substantially linear shape so as to follow the outer shape of the tab tail 31. The unsealing person can put the finger F under the tab tail 31 of the tab 30 from the finger debosses 50 formed in a concave shape, and can easily lift the tab 30.

  As shown in FIGS. 2 and 3, the finger debosses 50 include a first debossed portion 51 formed in a convex shape downward from the panel deboss 25, and a substantially circumferential direction of the first debossed portion 51 (of the tab 30). The second debossed portion 52 is formed on each side in the width direction) and is surrounded by a connection surface 53 having no step. Each second debossed portion 52 is smaller in depth from the panel debossed 25 than the first debossed portion 51 (see FIG. 8). Further, as shown in FIG. 2, the substantially circumferential width of the first debossed portion 51 is wide on the tab tail 31 side and narrow on the counter sink 40 side.

  In addition, the finger debosses 50 in the can lid 10 of the present invention are provided so as not to enter below the tab tail 31 of the tab 30 as shown in FIG. Thereby, when the can lid 10 is stacked, the finger debosses 50 protruding to the lower surface side do not come into contact with the tab 30 of the can lid 10 laminated on the lower side, so that it is excellent in stacking property and easy to handle. Yes.

  In the finger debosses 50, the second debossed portions 52 are formed relatively shallow on both sides of the first debossed portions 51, so that the first debossed portions 51 can be prevented from breaking during the molding of the deep first debossed portions 51. The finger holdability is improved by the depth of the portion 51 and the width of the finger deboss 50 by the second debossed portion 52, and a good unsealing property can be obtained. Moreover, in the 1st debossed part 51, since the tab tail 31 side is formed widely, the space which a finger | toe can take can be widened and unsealing property can be improved. In addition, a connection surface 53 having a larger inclination angle with respect to the panel portion 20 than the second debossed portion 52 is provided between each second debossed portion 52 and the panel portion 20 along the substantially circumferential direction. The shape rigidity of the bent part between the surface 53 and the panel part 20 is high, and the spring back in this part is prevented. As shown in FIG. 2, the first debossed portion 51 is rounded so that the corners are not sharp, so there is a portion where the circumferential width is slightly narrowed on the tab tail 31 side. The width in the circumferential direction on the tab tail 31 side is increased.

  Moreover, as shown in FIG. 3, the 2nd debossed part 52 shallower than the 1st debossed part 51 is not formed in the both sides of the 1st debossed part 51 on the centerline along a tab longitudinal direction. Therefore, as shown in FIG. 3 showing a cross section along the center line, the first debossed portion 51 is connected to the panel debossed 25 in the vicinity of the tab tail 31, whereas in the vicinity of the counter sink 40 in the central portion in the tab width direction. It is connected to the panel unit 20 via the connection surface 53. Thus, since the 2nd debossed part 52 is not formed in the both sides of the 1st debossed part 51 on the center line which follows a tab longitudinal direction, the size of the tab longitudinal direction of this finger debossed 50 is suppressed small. . Further, since there is no step on the connection surface 53, the finger F can easily enter the finger debosses 50 (first debossed portions 51) in the vicinity of the tab tail 31, and the tab tail 31 can be easily lifted.

  Furthermore, as shown in FIG. 2, the counter sink side of the first debossed portion 51 is formed narrow, so that a local protrusion (so-called “square out”) accompanying the swelling of the can lid 10 when the container internal pressure rises. Can be suppressed and the container pressure resistance can be improved. Although the first debossed portion 51 of the present embodiment is formed in a substantially half-moon shape, it may be trapezoidal or triangular as long as the tab tail 31 side is wide and the counter sink 40 side is narrow. Since the first debossed portion 51 is formed in such a shape, the first debossed portion 51 is the second debossed portion 51 along the tab longitudinal direction at the both sides in the tab width direction in the vicinity of the counter sink 40 of the finger debossed 50. It is connected to the panel portion via the debossed portion 52 and the connection surface 53. Thereby, shape rigidity of the 1st debossed part 51 can be made high, and pressure resistance can be improved, preventing cornering.

  More specifically, as shown in FIG. 2, the finger deboss 50 has a width A along the longitudinal direction of the tab 30 of 2.5 mm or more and 3.5 mm or less, and a substantially circumferential width B passing through the center point P of the width A. Is formed to be 8 mm or more and 12 mm or less. Each of the second debossed portions 52 is formed such that the substantially circumferential width C on the line passing through the center point P is 2.8 mm or more and 3.7 mm or less.

  Further, as shown in FIG. 3, the finger debosses 50 have a depth D1 of the first debossed portion 51 from the panel debossed 25 of 0.3 mm to 0.6 mm, and the depth of each second debossed portion 52 from the panel debossed 25. D2 is set to be 0.2 mm or more and 0.4 mm or less, and D1> D2. Moreover, the depth from the panel part 20 of the panel deboss 25 is 0.4 mm or more and 0.5 mm or less.

  As described above, in the can lid 10, the finger debosses 50 are formed in two steps so that the first debossed portion 51 is deep and the second debossed portions 52 on both sides are shallow along the substantially circumferential direction. Therefore, for example, even in a small-diameter can lid in which the distance between the tab tail 31 and the counter sink 40 is about 4 to 6 mm, the openability can be improved without reducing the pressure resistance. Further, in the finger deboss 50, the step between the first debossed portion 51 and each second debossed portion 52 is not formed in the vicinity of the tab tail 31 of the tab 30, so that it is easy to put a finger on the tab tail 31.

(Examples and Comparative Examples)
Table 1 shows the results of comparing Examples 1 to 3 and Comparative Examples 1 to 3 according to the present invention with respect to can lids having different shapes and dimensions near the finger debosses. The dimensions A, B and C shown in Table 1 correspond to the dimensions A, B and C shown in FIG. Further, the depth D1 of the first debossed portion and the depth D2 of the second debossed portion shown in Table 1 are depths from the panel debossed and correspond to the dimensions D1 and D2 shown in FIG.

  As shown in Table 1, the evaluation of Examples and Comparative Examples was performed with respect to moldability, pressure resistance performance, stacking property, and finger grip. About the moldability, it implemented by the copper sulfate check. That is, an aqueous copper sulfate solution mixed with copper (II) sulfate pentahydrate: hydrochloric acid: water = 200 g: 100 ml: 700 ml was brought into contact with the moldability evaluation part and allowed to stand for 1 minute. Since copper was deposited at the damaged site, the presence or absence of copper deposition was observed, and if it was 0 out of 50 sheets, the moldability was evaluated as ○, and if it was 1 sheet, it was evaluated as formability x. With regard to pressure resistance, each can lid was wrapped around the can body, the inside of the can was pressurized until the can lid buckled, and if the average value of the buckled pressure was larger than the target pressure resistance, it was evaluated as pressure resistance performance ○. .

  Regarding stacking property, 180 cases of can lids were stacked, and the case where the difference between the natural length (stacking height) and the stacking height when a load of 1.5 kg was applied in the stacking direction was 15 mm or more was evaluated as x. Regarding finger grip sensuality, 7 or more out of 10 people judged that the finger grip performance was not bad, and evaluated as “good”.

  About the can lid | cover of Examples 1-3, when the dimension of each part of finger debossing was changed in the preferable range, the favorable result was obtained about all of a moldability, pressure resistance performance, stacking property, and finger hook functionality.

  In the can lid of Comparative Example 1, the first debossed portion and the second debossed portion were provided, but when the width A in the tab longitudinal direction of the finger deboss was increased so as to enter the lower portion of the tab, stacking properties were obtained. The result was bad. This is presumably because the lower surface of the finger debosses entering the lower part of the tab hit the tab of the laminated lower can lid.

  In the can lid of Comparative Example 2, the first debossed portion and the second debossed portion were provided, but when the width A in the tab longitudinal direction of the finger deboss was increased so as to communicate with the counter sink, the pressure resistance performance The result was bad. This is presumably because the strength of the outer peripheral edge portion of the panel portion has decreased due to the communication between the finger debosses and the counter sink.

  In the can lid of Comparative Example 3, when the finger debosses without the second debossed portion were provided, the result that the moldability and the pressure resistance performance were poor was obtained. This is considered to be due to the fact that since there is no second debossed portion, the amount of deformation at the time of molding is large and partial thinness occurs.

  Next, a method for manufacturing the can lid 10 according to the present invention will be described with reference to FIGS. The finger debosses 50 of the can lid 10 form a first debossed portion 51 by pushing down a part of the panel portion 20 into a planar shape. Further, the first debossed portion 51 and the panel are further formed during the formation of the first debossed portion. The substantially middle position between the panel 20 and the first debossed part 51 is bent downwardly in a convex manner by pushing down a substantially intermediate position between the panel part 20 and the first debossed part 51. It is formed by forming the shallow second debossed portion 52.

  More specifically, as shown in FIGS. 4 and 5, a lower punch 100 that supports the lower surface of the outer peripheral portion of the finger debosses 50, and an upper punch 110 that descends from above the lower punch 100 and presses the plate material 11. The finger debosses 50 of the can lid 10 are formed by pressing the plate material 11 between them. Prior to this molding step, a counter sink or the like has already been formed. Further, in the step of forming the finger debosses 50, the panel debosses 25 are also formed at the same time, but detailed description of the formation of the panel debosses 25 is omitted here.

  The lower punch 100 includes a panel support portion 101 that supports the lower surface of the panel portion 20 and a panel deboss support portion 102 that supports the lower surface of the panel deboss 25 inside the panel support portion 101, and the panel support portion 101 and the panel deboss support portion 102 A hole 103 into which the upper punch 110 for forming the finger deboss 50 is inserted is formed therebetween. In FIG. 4, the upper surface of these lower punches 100 (panel support part 101 and panel deboss support part 102) is shown.

  As shown in FIGS. 4 and 5, the upper punch 110 has a planar first press portion 111 that forms a substantially flat first debossed portion 51, and a shape that is retracted one step from the first press portion 111. A second press part 112 for forming each second debossed part 52 by pressing a substantially intermediate position between the first debossed part 51 and the panel part 20 in a dotted or linear manner. And the 2nd press part 112 is driven so that it may enter into the hole 103 provided in the lower punch 100. FIG. In addition, the level | step difference of the 1st press part 111 and the 2nd press part 112 is 0.2 mm, for example. Further, the roundness of the tip corner of the first press part 111 is smaller than the roundness of the tip corner of the second press part 112, thereby forming the first debossed part 51 so that the contour becomes clearer.

  A clearance 104 is formed along the surface direction of the plate material 11 between the inner surface of the hole 103 of the lower punch 100 and the second press portion 112 of the upper punch 110, thereby ensuring the amount of material flowing in, Springback can be suppressed and molding with high shape rigidity can be performed.

  When the upper punch 110 is lowered with respect to the lower punch 100 on which the plate material 11 is placed, as shown in FIG. 6, the plate material 11 is pushed down into a planar shape by the first press portion 111 against the lower panel support portion 101. As a result, the first debossed portion 51 is formed. When the upper punch 110 is further lowered while forming the first debossed portion 51 in this way, as shown in FIG. 7, the second press is made at a substantially intermediate position between the first press portion 111 and the panel debossed support portion 102. The outer edge part of the part 112 is contact | abutted to the board | plate material 11, and when this board | plate material 11 is pushed down linearly, it will be bent below convexly and the 2nd debossed part 52 will be formed (FIG. 8).

  Incidentally, if there is no second press part 112 and only the first debossed part 51 is formed by the first press part 111, the inclination of the plate material 11 from the upper surface of the lower punch 100 to the first press part 111 is small, and both end portions thereof The bent portion is returned by the spring back, and a finger deboss having a desired shape cannot be obtained.

  On the other hand, if the entire finger debosses 50 including the first debossed portion 51 and the second debossed portions 52 are formed to the depth D1, the bent portion becomes too small and cracks or the like are likely to occur. By forming the finger debosses 50 so as to have two steps in the substantially circumferential direction inside the connection surface 53 as in the present invention, the spring back is suppressed and the bent portion has an appropriate shape without causing cracks. It is possible to form the can lid 10 having a good openability and having the first debossed portion 51 that is deep and has a good finger-holding property.

  In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention.

  When a shallow portion like the second debossed portion is formed around the entire first debossed portion, the effect of suppressing the spring back is high and a can lid having high shape rigidity can be obtained. However, if a shallow portion is formed in the vicinity of the counter sink, the pressure resistance performance may be deteriorated. Therefore, in the case of a small-diameter can lid that does not have enough space for forming finger debosses, as in the present invention. By not forming the second debossed portion in the tab longitudinal direction of the first debossed portion and not increasing the tab longitudinal direction dimension of the finger debossed portion, it is possible to improve the openability without reducing the pressure resistance.

10 Can lid 11 Plate material 20 Panel portion 21 Opening piece 22 Score 23 Rivet 25 Panel deboss 30 Tab 31 Tab tail 32 Tab nose 40 Counter sink 50 Finger deboss 51 First debossed portion 52 Second debossed portion 53 Connection surface 100 Lower punch 101 Panel support portion 102 Panel debossed Supporting part 103 Hole part 104 Clearance 110 Upper punch 111 First press part 112 Second press part F Finger

Claims (4)

A substantially disc-shaped panel portion and an annular counter sink provided on the outer peripheral portion of the panel portion, including a central portion in the panel portion, and a part of the inner peripheral side of the counter sink being concave A can lid comprising a panel deboss formed, a score provided on the panel deboss to form an opening piece, and a tab fixed in the panel deboss by a rivet provided at the center of the panel,
The tab has a tab tail located on the opposite side of the opening piece across the rivet,
In the panel deboss, a concave finger deboss is formed between the tab tail of the tab and the counter sink,
The finger deboss has a first debossed portion formed so that a part of the panel deboss is convex downward, and is convex downward between the first debossed portion and the panel deboss. A second debossed portion formed on each of both sides of the first debossed portion so as to have a smaller depth from the panel debossed than the first debossed portion,
The can lid characterized in that the first circumferential direction width of the first debossed portion is wide on the tab tail side and narrow on the counter sink side.   The finger debosses have a width along the longitudinal direction of the tab of 2.5 mm or more and 3.5 mm or less, a substantially circumferential width at a center position of the width of 8 mm or more and 12 mm or less, and a substantially circumferential width of each second debossed portion. The can lid according to claim 1, wherein is 2.8 mm or more and 3.7 mm or less.   The finger debosses have a depth of 0.3 mm to 0.6 mm from the panel debosses of the first debossed portions, and a depth of 0.2 mm to 0.4 mm of the second debossed portions from the panel debosses. The can lid according to claim 1, wherein the can lid is provided. In a can lid in which a tab is attached to a substantially disc-shaped panel portion, a can lid manufacturing method for forming a finger deboss for placing a finger on the tab,
While forming a first debossed part by pushing down a part of the panel part into a planar shape,
From the middle of the formation of the first debossed portion, the panel is further bent downwardly in a convex shape by pushing down a substantially intermediate position between the first debossed portion and the panel portion into a dotted or linear shape. Forming a second debossed portion shallower than the first debossed portion between the first debossed portion and the first debossed portion.

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