JP2539913Y2 - Can lid - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can lid which is opened by a stay-type tab.

[0002]

2. Description of the Related Art In recent years, the opening portion of a can lid such as a beverage can has
In order to prevent various adverse effects due to the disposal of the tab after the can is opened, a so-called stay-on tab, in which the tab and the can lid are partially connected even after the can is opened, is being adopted.

FIG. 8 shows an aluminum alloy can lid (for a 350 ml can, having an outer diameter of about 6 mm) using such a stainless steel tab.
In this example, a score line 3 is formed by forming a substantially U-shaped cut line 2 on the surface of the can lid body 1, and one end of the score portion 3 is formed. On the side, a stay tab (hereinafter, abbreviated as “tab”) 4 is joined via a rivet 5.

[0004] Here, the tab 4 has a push-down portion 6 formed on one end of the tab 4 so as to overlap the score portion 3, and a pull-up portion 7 for hanging an operator's fingertip on the other end. A finger hole portion 8 formed between the pulling portion 7 and the rivet 5 for improving operability at the time of opening the can.
The pull-up portion (one end) 6 is pulled up to thereby cause the push-down portion (the other end) 6 to be pulled up.
Is brought into contact with the upper surface of the score portion 3 to press the score portion 3, whereby the score line 2 is torn, the score portion 3 is bent downward, and the can lid 1 can be opened.

Here, in a normal can lid, the score line 2
Is configured such that the depth of cut near the opening start end is greater than the depth of cut in the other portions, and when the score portion 3 is pressed by the press-down portion 6, the cut line 2 The score part 3 after opening is torn in order from the start end to the end so that it does not separate from the can lid body 1.

As means for forming the cut line 2, the can lid main body 1 is sandwiched between an upper die having a score blade 9 as shown in FIG. 9 and a lower die formed in a substantially flat plate shape. Then, the score blade 9 forms the cut line 2 on the upper surface of the can lid main body 1.

In the conventional can lid, since the cut depth near the opening end of the cut line 2 is formed deep, a product can is manufactured and transported using the can lid. However, there has been a problem that the vicinity of the opening start end of the cut line 2 is unexpectedly broken due to vibration or the like, and the contents leak and the commercial value of the product can is lost.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a can lid which can prevent unexpected breakage of a cut line during transportation or the like. I have.

[0009]

The can lid according to the present invention is provided with a step near the opening end of the cut line, the step being formed to be shallower than the cut depth at other portions.

[0010]

The stress applied to the cut line portion can be received by the step portion, so that unexpected breakage of the cut line due to vibration or the like can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a can lid according to an embodiment of the present invention will be described with reference to FIGS. The same components as those of the conventional can lid described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

The can lid of the present embodiment differs from the conventional can lid in that a stepped portion 20 is formed in the vicinity of the opening start end 2a (see FIG. 2) of the cut line 2 so as to project upward. doing.
The length of the step portion 20 along the direction of the cut line 2 is 9 to 10 mm in this example. In addition, the code | symbol 2c in FIG.
The start of the opening of the cut line 2, the reference numeral 2b indicates the end of the opening of the cut
Reference symbol S denotes a position where the rivet 5 is to be attached to the can lid body 1 (hereinafter referred to as “rivet center”), and reference numeral 1
“0” is a sub-score formed so as to be cut more shallowly than the score line 2 and to improve the easiness of breakage of the score line 2.

In the can lid of this embodiment, the thickness of the can lid body 1 is 0.3 mm, and the thickness of the cut line 2 is about 0.115 m.
m, the maximum thickness of the step 20 is 0.195 mm.

Hereinafter, the position where the step 20 is formed will be described with reference to FIG.
It will be described based on. In the drawing, reference numeral L1 denotes a straight line passing through the rivet center S and the center of the score unit 3, and reference numeral L2 denotes a straight line inclined at an angle α (30 ° in this example) clockwise from the straight line L1 about the rivet center S. L3 is
A distance D1 (3.0 mm in this example) from the straight line L2,
A straight line parallel to the straight line L2, and a symbol L4 is a straight line L
2 and a distance D2 (12.0 mm in this example) and is parallel to the straight line L2. In the can lid of this example, the step 20 is formed between the straight lines L3 and L4.

Next, the configuration of a mold for forming the cut line 2 of the can lid according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. In the mold used in this example, a concave portion 19 having a depth H1 (0.080 mm in this example) is provided at a position corresponding to the step portion 20.
The score blade 19 in which a is formed is provided. Steps 19b and 19c are formed in the recess 19a, and their side surfaces are inclined at angles θ1 to θ1.
It is constituted by an inclined surface inclined at θ4. Here, the depth H2 of the step portion 19b is 0.0 in this example.
05 mm. Further, the inclination angles θ1 to θ1
θ4 is desirably in the range of 10 ° to 60 °. This mold is moved in the direction A in FIG. 3 and pressed against the surface of the can lid body 1 to form the cut line 2 as in the prior art.

According to the can lid of this embodiment, since the step portion 20 is formed near the opening start end 2a of the cutting line 2, even when vibration is applied to the product can, the step portion 20 receives stress. Therefore, it is possible to prevent the vicinity of the opening start end 2a from being broken during the conveyance and the contents from leaking out.

Here, if the cutting depth of the cutting line 2 is made uniform and shallow, it is possible to certainly improve the breaking strength, but it impairs the ease of opening the can by operating the tab 4. However, in the can lid of this example, since the step portion 20 is formed partially and locally in the vicinity of the opening start end 2a, the reduction in ease of opening the can is minimized. This has the advantage that sufficient vibration and impact resistance can be imparted.

In the can lid of the above embodiment,
Although the shape of the step portion 20 formed in the cut line 2 is flat as shown in FIG. 1, the shape of the step portion 20 may be a slightly steep shape as shown in FIG. As shown in FIG. 6, it may be composed of two steps 21 and 22, and furthermore, may be a simple trapezoid as shown in FIG.

[0019]

[Effects of the Invention] The can lid of the present invention has a step formed near the opening start of the cut line and shallower than the cut depth in the other part. There is an effect that it is possible to prevent the contents from leaking due to breakage.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a can lid according to an embodiment of the present invention, taken along a cut line.

FIG. 2 is a main part plan view showing a cut line portion of the can lid according to the embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of a score blade portion of a mold used in the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part along a line BB in FIG. 3;

FIG. 5 is a view showing a modification of the embodiment of the present invention, and is an enlarged sectional view of a main part in a portion corresponding to FIG. 1;

FIG. 6 is a view showing a modification of the embodiment of the present invention, and is an enlarged sectional view of a main part in a portion corresponding to FIG. 1;

FIG. 7 is a view showing a modification of the embodiment of the present invention, and is an enlarged sectional view of a main part in a portion corresponding to FIG. 1;

FIG. 8 is a plan view of a conventional can lid.

FIG. 9 is an enlarged perspective view of a main part showing a score blade portion of a mold used for forming a score line in a can lid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Can lid body 2 Cut line 2a Near opening start 2b Open end 2c Opening end 3 Score part 4 Stained type tab 20 Step part

Claims (1)

(57) [Scope of request for utility model registration] 1. A score portion is defined by providing a score line in a can lid main body, and by pulling up one end of a stion type tab attached to the can lid main body, the other end of the tab is connected. The score portion is pressed downward while being in contact with the score portion upper surface, and the score line is cut from the opening start end to the end, and the score portion is pushed down to the inner surface side of the can lid body to open the score portion. A can lid having a configuration in which a step portion formed shallower than a cut depth in other portions is provided near an opening start end of the cut line.