JP2006315747A - Can lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can lid capable of having a superior plug opening characteristic. <P>SOLUTION: This can lid 10 comprises a center panel part 11, a chuck wall part 12 raised up radially outward from the outer peripheral edge of the center panel part 11 and a seaming panel part 13 continuously provided at the outer peripheral edge of the chuck wall part 12 and having its terminal end folded downward, wherein a rivet 14 protruded upwardly and an opening part 15 defined by a score 15a are formed at the upper surface of the center panel part 11 and there is provided a tab 16 fixed to the rivet 14 so as to cause one end part 16a to be overlapped on the opening part 15. An end surface 16d at the other end 16b opposite to one end part 16 of the tab 16 has a plane area of 30 mm<SP>2</SP>or more where the end surface is seen from the front side, and a size of the can lid 10 in an axial direction is 2 mm to 5 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a can lid that is wound around an open end of a can body.

  In general, this type of can lid, as shown in, for example, Patent Document 1 below, rises from a disc-shaped center panel portion that occupies the center portion and radially outward from an outer peripheral edge portion of the center panel portion. A chuck wall portion and a seaming panel portion that is connected to the outer peripheral edge of the chuck wall portion and whose end portion is bent downward, and is convex upward on the upper surface of the center panel portion. A rivet and an opening defined by a score are formed, and a schematic structure is provided with a tab fixed to the rivet so that one end of the opening overlaps the opening.

  The thus configured can lid is fixed to the opening end by winding the seaming panel portion around the opening end of the bottomed cylindrical can filled with the contents, so-called The can is constructed. And this can pushes the opening to the can axis direction downward by the one end of the tab by pulling up the other end of the tab in the can axis direction, and breaks the score to open the opening. The plug is opened by opening the part.

  By the way, in this kind of can lid, in order to prevent so-called vibration leakage, a tab is attached to the rivet (riveting). A predetermined amount of molding load is secured and the tab is firmly fixed to the rivet. It has been done. Here, the vibration leakage means that the can body is transported to the store from the filling factory after the can lid is wound around the opening end of the can body filled with the contents. Due to the vibration that acts, the tab vibrates using the rivet as a fulcrum, and the one end side of the tab intermittently collides with the surface of the opening, so that the score defining the opening is broken due to fatigue. A thing that leaks.

  However, in this case, at the time of opening the plug, it is impossible to open the finger without pulling up the other end with a large pulling force upward in the can axis direction while pressing the finger against the other end of the tab with a large pressing force. In other words, it was one of the major factors that hindered good openability.

Therefore, there is an increasing demand for means for providing good openability while preventing vibration leakage without reducing the rivet forming load. As such means, conventionally, by pressing and denting the lower surface (surface opposite to the upper surface of the center panel portion) side of the other end portion of the tab in a direction away from the upper surface of the center panel portion. The gap between the lower surface of the other end portion and the upper surface of the center panel portion is widened.
Registered Utility Model No. 2508637

  However, in this can lid, the thickness of the other end of the tab (or the curvature radius of the curved shape that is convex outward in the radial direction of the center panel and extends in the thickness direction) is reduced. When a finger is pressed against the other end with a large pressing force, when the other end is pulled up with a large pulling force, the pain felt by the finger becomes strong, so that it also has a good opening performance. There was a problem that it was difficult.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a can lid that can be provided with good openability.

In order to solve such problems and achieve the above-described object, the can lid of the present invention includes a disc-shaped center panel portion that occupies the center portion, and a radially outward portion from the outer peripheral edge portion of the center panel portion. A chuck wall portion that rises toward the outside, and a seaming panel portion that is connected to the outer peripheral edge of the chuck wall portion and whose end portion is bent downward, and is directed upward on the upper surface of the center panel portion. A can lid comprising a tab formed on a rivet formed with a score and an opening defined by a score, and fixed to the rivet so that one end of the opening overlaps the opening. The end surface at the other end opposite to the one end is 30 mm ² or more in a plan area when the end surface is viewed from the front, and the axial size of the can lid is 2 mm to 5 mm. It is characterized by that.

In this case, the end surface at the other end opposite to the one end of the tab has a plane area of 30 mm ² or more when the end surface is viewed from the front, and a size in the axial direction of the can lid is ² mm to Since the thickness of the can is 5 mm and the thickness is increased, when the can body is opened at the open end of the can body filled with the contents, the finger is tabbed. Even when the other end portion is pulled up with a large pulling force in a state of being strongly pressed against the end face of the other end portion, the pain felt by the finger can be suppressed to the minimum. Therefore, when opening the can body, it is possible to pull up the other end portion with a large pulling force in a state where the finger is strongly pressed against the end face of the other end portion of the tab. It can be provided with an openability.

  Here, when the size in the axial direction of the can lid at the other end on the opposite side to the one end of the tab is larger than 5 mm, the can lid is formed on the center panel portion of one can lid. When transported in a stacked state such that the upper surface and the lower surface of the center panel portion of another can lid face each other, the bottom surface of the center panel portion of the other can lid and the tab of one can lid The stacking length of the stacked can lids increases, and in the manufacturing process of the can lids, the transportability of these can lids is hindered. May reverse. When the can lid is used for a positive pressure can, the number of can lids transported in the stacked state is larger than that for a negative pressure can. The problem of inhibiting becomes significant. Therefore, when this can lid is used for a positive pressure can, it is possible to provide a good opening performance without impairing the transportability of the can lid.

  The can lid according to the present invention can provide a can lid having good openability.

  Embodiments of the present invention will be described below with reference to the drawings. A can lid 10 shown in FIG. 1 is formed of aluminum or an aluminum alloy, and has a disk-shaped center panel portion 11 that occupies a central portion, and an annular recess 17 that is continuous with the outer peripheral edge of the center panel portion 11 and is recessed downward. A chuck wall portion 12 that is continuous with the outer peripheral edge of the annular recess 17 and rises outward in the radial direction, and a sheet that is continuous with the outer peripheral edge of the chuck wall portion 12 and whose end is bent downward. A rivet 14 projecting upward and an opening 15 defined by a score 15 a are formed on the upper surface of the center panel 11. It has a schematic configuration including a tab 16 fixed to the rivet 14 so that the one end 16a side overlaps.

  The other end portion 16b of the tab 16 is formed with a finger hole 16c having a rectangular shape in plan view and opened in the thickness direction of the tab 16. Further, at the outer peripheral edge portion of the upper surface of the center panel portion 11, at least the end face (hereinafter referred to as “pressing end face”) 16 d of the other end portion 16 b of the tab 16 is in contact with the opposite side of the opening 15 sandwiching the tab 16. A finger hook recess 18 is formed at the position.

  The pressing end surface 16 d of the can lid 10 of the present embodiment extends in a direction orthogonal to the longitudinal direction of the tab 16 in a plan view of the can lid 10. In addition, in the plan view of the can lid 10, the portion 18 a that contacts the pressing end surface 16 d of the tab 16 of the finger-hanging recess 18 also extends in a direction perpendicular to the longitudinal direction of the tab 16, similarly to the end surface 16 d. is doing.

The pressing end surface 16d of the present embodiment has a planar area of 30 mm ² or more, preferably 30 mm ² or more and 75 mm ² or less when the end surface 16d is viewed from the front, and the size of the can lid 10 in the axial direction is ² mm to ² mm. It is 5 mm. Further, the front view of the end surface 16d is semi-elliptical as shown in FIG. 2A, and the lower surface 16e facing the upper surface of the center panel portion 11 has an arc shape and is opposite to the lower surface 16e. The upper surface 16f on the side is linear. Further, the pressing end surface 16d is a flat surface, and is inclined with respect to the axial line of the can lid 10 by 10 ° or less inward in the radial direction of the can lid 10 or with respect to the axial line of the can lid 10. It is set as the structure extended in parallel with this axis.

As described above, according to the can lid 10 of the present embodiment, the pressing end surface 16d of the tab 16 has a plane area of 30 mm ² or more when the end surface 16d is viewed from the front, and the can lid 10 Since the size in the axial direction is 2 mm to 5 mm and the thickness is increased, in the configuration in which the can lid 10 is wound around the opening end of the can filled with the contents, the can 10 Even when the other end portion 16b is pulled up with a large pulling force in a state where the finger is strongly pressed against the pressing end surface 16d when opening the plug, the pain felt by the finger can be minimized. Therefore, when opening the can body, it is possible to pull up the other end portion 16b with a large pulling force in a state where the finger is strongly pressed against the pressing end surface 16d. It can have plugging properties.

  Here, when the size of the pressing end surface 16d of the tab 16 in the axial direction of the can lid 10 is larger than 5 mm, the can lid 10 is separated from the upper surface of the center panel portion 11 of the one can lid 10 and the like. When transported in a stacked state such that the lower surface of the center panel portion 11 of the can lid 10 faces each other, the lower surface of the center panel portion 11 of the other can lid 10 and the one can lid 10 When the tabs 16 come into contact with each other, the stacked lengths of the stacked can lids 10 increase, and in the manufacturing process of the can lids 10, there is a possibility that the transportability of these can lids 10 may be hindered.

  The verification test about the above effect was implemented. As test objects, a plurality of can lids having different flat areas of the pressing end surfaces when the pressing end surfaces of the tabs are viewed from the front and the pressing end surfaces in the axial direction of the can lids are formed. A plurality of cans were individually wound around the open ends of the cans filled with the contents.

  And when opening each of these can bodies, it was investigated whether they could be opened easily. The investigation of the openability was evaluated by having 10 people open each can body, and as a result, listening to whether or not it was easy to open. And when the number of people who responded that it was easy to open the plug was 5 or less, it was evaluated as x when there were more than 5 people.

The results are shown in FIG. As a result, when the pressing end surface of the tab is viewed from the front, when the flat area of the pressing end surface is 30 mm ² or more and the size of the can lid 10 in the axial direction is 2 mm to 5 mm Thus, it was confirmed that a good openability could be achieved.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the shape of the pressing end surface 16d viewed from the front is not limited to the above embodiment, and a configuration as shown in FIGS. 2B to 2D may be adopted.
That is, as shown in FIG. 2 (b), the pressing end surface 16 d may be formed in an elliptical shape whose major axis extends in parallel with the upper surface of the center panel portion 11.

  Further, as shown in FIG. 2 (c), in the front view of the pressing end surface 16d, the lower surface 16e facing the upper surface of the center panel portion 11 extends across the entire width direction thereof, and the upper surface of the center panel portion 11 The upper surface 16d opposite to the lower surface 16e is formed in a straight line extending substantially in parallel, and only the central portion in the width direction has an elliptical arc shape protruding upward in the axial direction of the can lid 10. Good.

Further, as shown in FIG. 2 (d), a front end elliptical concave portion 16g is formed at the center of the pressing end surface 16d shown in FIG. 2 (b) so that the index finger or the middle fingertip can be inserted. May be. Further, in this case, the surface of the recess 16g may be roughened.
Furthermore, in FIG. 2D, instead of the recess 16g, only a position corresponding to this portion may be formed on a flat surface orthogonal to the upper surface of the center panel portion 11.

  Further, instead of the pressing end surface 16d shown in FIG. 1, as shown in FIG. 3, the center portion in the width direction of the end surface 16d may be recessed in a curved shape toward the one end portion 16a side of the tab 16. Good. And the part 18a which follows the pressing end surface 16d among the finger hook recessed parts 18 may be made to protrude in the curved shape toward the one end part 16a side of the tab 16. Note that the radius of curvature of the pressing end surface 16d as shown in FIG. 3 is set to a size along the index finger or the fingertip of the middle finger. Further, even when the pressing end surface 16d is recessed in the curved shape, the front view shape may be the same as that shown in FIGS.

  Furthermore, the can lid 10 of the embodiment can be applied regardless of whether it is a positive pressure can or a negative pressure can. However, when the can lid 10 is used particularly for a positive pressure can, the transportability of the can lid 10 can be applied. It is possible to provide good openability without inhibiting the above.

  Provided is a can lid having good openability.

It is a schematic plan view of the can lid shown as one Embodiment of this invention. It is a top view of the pressing end surface shown in FIG. 1 and FIG. It is a schematic plan view of the can lid shown as other embodiment of this invention. It is a figure which shows the test result which verified the effect of the can lid of this invention.

Explanation of symbols

10, 20 Can lid 11 Center panel portion 12 Chuck wall portion 13 Seaming panel portion 14 Rivet 15 Opening portion 15a Score 16 Tab 16a One end portion 16d End surface

Claims (1)

A disk-shaped center panel portion occupying the central portion, a chuck wall portion rising radially outward from the outer peripheral edge portion of the center panel portion, and an end of the chuck wall portion continuously connected to the outer peripheral edge of the chuck wall portion A seaming panel portion bent downward, and a rivet convex upward and an opening defined by a score are formed on the upper surface of the center panel portion. A can lid provided with a tab fixed to the rivet so that one end side overlaps with
The end surface at the other end opposite to the one end of the tab has a plane area of 30 mm ² or more when the end surface is viewed from the front, and the axial size of the can lid is 2 mm to 5 mm. A can lid characterized by having.

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