JPH02233362A - Non-bent type full easy openable can cap - Google Patents

Abstract

PURPOSE:To reduce a tearing force and facilitate opening of a can, by inclining, with a specified angle against the tearing force, a line connecting the start point of the first or second bead to the front edge of the fixed point and further making the same or shorter the distance between the centers of the end of the second bead and the fixed point than the same distance of the first bead. CONSTITUTION:A couple of the first and second beads 5, 6 are formed symmetrically around the center of a fixed point 4 at which a pulling tab 3 is fitted to a can cap 1. A line (1) connecting the start edge 5a of the bead 5 to the front point 9 of the fixed point 4 is inclined with an angle theta (45 deg.-85 deg.) against the axis X-Y. When the can cap 1 is pulled up with holding fingers at the inner side of the pulling tab 3, the can starts to open at an initial opening point 2a and gradually opened along the opening score 2 up to the nearby point of a crossing of the line (1) and the opening score 2. Moreover, when the pulling tab 3 is pulled up, as the bending rigidity of the opened cap piece 7 regarding to the tearing direction X becomes strong by the two beads, an initial opening is finished with opening from the crossing 2b to a crossing 2c. The crossing 2c is a crossed point of a curve (m) passing through the end point 5b of the first bead 5 and the opening score 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-hent type Flueasy Oven can lid whose opening piece can be easily torn off and separated from the can lid after the opening of the can.

[Conventional technology]

Easy-open can lids allow cans to be opened using the pulling force of a fingertip without the need for tools such as a can opener. Because of this convenience, it is now widely used in food cans, carbonated beverage cans, beer cans, etc.

These easy-open can lids are classified into partial-open can lids that open a portion of the can lid (hereinafter referred to as partial easy-open can lids) and full easy-open can lids that open the entire can lid. .

Partial easy-open can lids can be opened by pulling the tension knob fixed to the opening piece, the top of the opening piece on one side of the tension knob is pulled and lifted, and opening is started, and by continuing to pull the tension knob. Complete the opening. On the other hand, in the Flu Easy Open can lid, the tip of the opening piece to which the tension knob is fixed is once bent inside the can body to start opening.

Then, by pulling up this opening piece, the opening operation is continued and the entire can is opened.

In this way, the initial opening format is different between the partial easy-open can lid and the full easy oven can lid. In addition, in the Flu Easy Open can lid, the radius of curvature of the apex shape on the side where opening starts is larger than that of the Partial Easy Oven can lid, so stress is difficult to concentrate at the time of opening, resulting in poor initial can properties. Furthermore, since the full easy-open can lid has a larger opening piece than the partial easy-open can lid, the initial tearing force on the can is much greater.

For this reason, the flue-easy oven can lid has poor opening performance compared to the partial easy-open can lid.

Various studies have been carried out in order to improve the opening properties of this Flu Easy Oven can lid. For example, by forming a destruction score on the first opening score line carved on the periphery of the can lid, the remaining thickness of this part is made smaller than the remaining thickness of the opening score, and the first destruction point is It is proposed in Japanese Utility Model Application No. 5743239. In this way, by thinning a portion of the opening loss score line, initial can opening performance is improved. Also, JP-A-52
In Japanese Patent No. 94291, initial performance is improved by defining the distance between the tip of the tab and the closest opening loss core. On the other hand, in the case of a non-hent type fluid easy-open can lid in which opening is started from the part where the opening score is closest to the fixed part of the tension knob without providing a Hen 1 score, for example, 5
As proposed in 4-54786, an auxiliary score and a bead are provided along the inside of the opening score, and the discontinuous part of the auxiliary score near the fixed part is made longer than the discontinuous part of the bead. is proposed.

By providing such a bead, a large constriction is created in the opening score near the fixed portion, thereby improving initial can opening performance.

These measures facilitate the task of initiating opening of the can lid when raising the pull tab. but,
To date, no effective means has been proposed to reduce the tearing force after the initial opening.

[Problem to be solved by the invention]

By the way, the ease or difficulty a person feels when opening an easy-open can lid is determined not only by the initial opening performance at the start of opening, but also by the force used to tear the can lid from the can body once opening has begun. It is also greatly influenced by the size of the For example, even if the initial can properties are excellent, if the tearing force is large, the impact and vibrations generated when tearing the can lid will be transmitted to the can body, causing the contents to spill out. It's possible.

Particularly in the case of flue-easy-open can lids, the opening piece that is separated from the can body is large, so the tearing force is large.

Therefore, an object of the present invention is to reduce this tearing force to improve the openability of a Flueasy-open can lid.

[Means to solve the problem]

Therefore, the present inventors divided the bending rigidity of the opening piece in the tearing direction into a strong part and a weak part in non-hen 1~ type flueasy open can lids, and further identified the position of this boundary part to open the can. It was found that the performance was improved compared to the conventional method.

The non-vent type Flueasy Oven can lid of the present invention has an opening score engraved on the periphery of the can lid, and a pull tab provided in the vicinity of the opening score on both sides of the fixed part of the pull tab. a first bead with a component along A straight line connecting the starting end of the first bead or the second bead and the tip of the fixed part is 45~
The bead is inclined between 85 degrees, and the distance between the end of the second bead and the center of the fixed part is equal to or shorter than the distance between the end of the first bead and the center of the fixed part. do. Here, the above-mentioned straight line means the boundary line between the strong and weak parts of rigidity, and refers to the one with the smaller angle θ with the Y-Y axis among the straight lines connecting the tip 9 of the fixed part and the starting end 5a or 6a of the bead. . At this time, the starting ends of the two beads may be provided anywhere on this straight line as long as they are inside the opening score.

[For production] The operation of the present invention will now be explained with reference to the drawings.

FIG. 1 shows an example of a Flueasy-open can lid according to the present invention. An opening score 2 is engraved on the periphery of the can lid 1. In the vicinity of this opening score -2,
A fixing portion 4 is formed in which the tension knob 3 is attached to the can M1. A pair of first heads 5 and second beads 6 are formed symmetrically with respect to the axis Y-Y parallel to the tearing direction X, with the fixed portion 4 as the center. Further, a straight line 1 connecting the starting end 5a of the first bead 5 and the tip 9 of the fixed portion 4 is inclined at an angle θ with respect to the axis Y-Y.

Next, the operation until the can lid 1 is opened will be explained. First, by placing a finger on the inside of the tension knob 3 and pulling it, opening is started at the initial opening start point 2a, and the opening is gradually opened along the opening score -2 until near the intersection 2b of the straight line l and the opening score 2. will be held. Further, as the tension knob piece 3 is pulled up, the bending rigidity of the opening piece 7 in the tearing direction X is strengthened by the two wooden beads, so the initial opening is completed by opening from the intersection point 2b to the vicinity of the intersection point 2c. Here, the intersection 2c is the intersection of the curve m passing through the terminal end 5b of the first bead 5 and the opening score -2, and is approximately the end point of the initial opening. During the initial opening, the can lid 1 is always pushed inside the can body and opened, as shown in FIG.

Therefore, the curve m becomes a bending line of the opening piece 7 after the initial opening. Continuing on, when you re-hook your finger on the outside of the tension knob 3 and then pull this opening piece 7 above the can M1 to tear the opening piece 7, the length of the arm of the bending moment acting on the opening piece 7 is Due to the large size, the tearing force after initial opening can be significantly reduced.

In the present invention, specifying the angle θ is important. The angle θ is
The larger the tension is, the more the tension knob 3 can be raised to reduce the force required during initial opening, especially the force required for opening from intersection point 2b to 20. However, if it exceeds 85 degrees, it will bend above the first bead 5. Therefore, the opening piece cannot be opened deeply in the tearing direction at the time of initial opening. Therefore, it is not possible to apply a moment when tearing the bow, and it is not possible to reduce the tearing force after the initial opening. On the other hand, the angle θ
However, if the angle is less than 45 degrees, not only the force during the initial opening becomes large, but also the opening starting force at the initial opening starting point 2a becomes large. For this reason, the angle θ is specified to be between 45 degrees and 85 degrees, but in order to reduce the opening initiation force, the force during the initial opening, and the tearing force after the initial opening in a well-balanced manner, the angle θ must be set to 65 degrees.
It is preferable that the angle is 0 to 80 degrees.

The first bead 5 is necessary to form the length of the arm that generates a bending moment during tearing, and in order to strengthen the bending openability of the opening piece 7 in the tearing direction X, in this embodiment, the first bead 5 is It is installed parallel to the tearing direction. However, this first bead 5 can also be inclined at an angle α with respect to the axis Y-Y, as shown in FIG. The bending rigidity of the first bead 5 is greatest when the direction of the bead 5 is the same as the tearing direction X, but if the angle α is within ±45 degrees, the opening piece 7 is hard to bend in the middle of the bead. However, when the angle α becomes more negative than −10 degrees, the first bead 5 approaches the fixed portion 4, which becomes an obstacle in the processing of the rivet 1. Therefore, it is preferable that the angle α of the first beat 5 is -10 degrees to 45 degrees. Here, if the angle α is negative, it means that the mutual spacing between the first beads 5 is narrow along the tearing direction Indicates that the Further, the terminal end portion 5b of the first bead 5
The distance a between the center of the fixed part 4 and the fixed part 4 is 1/2 of the diameter of the fixed part 4.
The above is preferable (see FIG. 1). When the diameter of the can lid 1 becomes larger, or when the board thickness or the remaining score thickness becomes thicker, the width and depth of the first bead 5 must be increased in order to increase the rigidity of the first bead 5. However, the first bead 5
Since it is close to the fixed part 4, there is a limit to its size due to processing.

For this reason, the second bead 6 is provided as an auxiliary to the first bead 5.

Note that even if these two pairs of beads have a linear or curved shape, they can have the above-mentioned effect. FIG. 3 shows a case where the first bead 5 is a straight line and the second bead 6 is a curved line. Further, as long as at least one of the two pairs of starting ends 5a and 6a of the beads is above the straight line, it may be located anywhere on the straight line.

The starting ends of these two pairs of beads 5 and 6 may be separated from each other, or may be placed at the same position to make the beads continuous.

FIG. 4 is a diagram illustrating an embodiment of the present invention in which the starting ends 5a and 6a of the beads are separated from each other.

In the second figure, θ5 is the angle between the Y-Y axis and the straight line p connecting the starting end 5a of the first bead 5 and the tip 9 of the fixed part, and θ6 is the angle between the starting end 6a of the second bead 6 and the Y-Y axis. A straight line connecting the tip 9 of the fixed part! 2 and the YY axis. In the case of a tree invention, θ is the smaller of θ, , θ6.

In the present invention, in FIG. 4, θ, 10, (in this case θ - θ
, - θ6), the effect of the present invention can be exerted to the maximum l@, but as shown in FIG. 4 (1), when θ, <θ
6 (in this case, θ - 05) or as shown in Figure 4 (2), even if it is 05>θ6 (in this case, θ - θ6), it is true as long as it satisfies the range of θ -45 to 85 degrees. Fully demonstrate and obtain the effects of the invention. In the case of θ, <θ6, the starting end 6a of the second bead 6 is located on the side opposite to the tearing direction In this case, the starting end 5a of the bead 5 is in the opposite direction to the tearing direction X (i.e., θ, 9
0 degrees).

Further, the can lid 1 may be provided with an auxiliary score -8 along with the opening score -2. Further, the Flueasy Oven can lid of the present invention can also be applied to a safety-type can lid that prevents injury from the cut end of the can and the opened opening piece.

The material to which the Flueasy-open can lid of the present invention is applied does not need to be specified; for example, in addition to the commonly used tin plate and aluminum plate, the following materials may be used.

(1) Non-ferrous metal materials such as iron and iron alloys or aluminum and aluminum alloys (2) Metal materials obtained by subjecting the metal materials of (1) above to surface treatments such as plating or painting (3) (1) and Composite metal material (4) in which an organic material such as resin is bonded to the metal material of (2) in a layered manner (4) (1) above
and (2) Composite metal monthly charge made by joining different metal materials in layers [Example] As the can lid 1, T-4 tin material with a plate thickness of 0.23n++n was used, and the opening score was -2. The remaining thickness is 50μm
Various flue easy-open can lids of type 301 (3'/,, inch) were manufactured, and Table 1 shows the measurement results of the bow-splitting force after the initial opening. In the same table, a conventional Flu Easy Open can lid without a bead is listed as a comparative example. On the other hand, Example 1.2 is a flueasy-open can lid having the shape shown in FIG.

As is clear from Table 1, the tearing force after initial opening is lower in Example 1.2 in which a bead was provided than in the comparative example. This indicates that the can can be opened easily without applying much force to the can lid.

〔Effect of the invention〕

As described above, the non-ben 1 type Fluid Easy Oven can lid of the present invention increases the rigidity of the opening piece by providing two wooden beads that define the position of the initial end, so that the can opening force after initial opening is increased. can be lowered.

[Brief explanation of the drawing]

Fig. 1 is a plan view of one embodiment of the Flueasy Open Can Lid of the present invention, Fig. 2 is a partially sectional side view of the opening, Fig. 3 is a plan view of another embodiment of the invention, and Fig. 4 Figure (1) (
2) is a plan view of another embodiment of the present invention. 1... Can lid, 2... Opening score -2a... Initial opening start point, 2b... Intersection, 2c
...Intersection point (initial opening end point), 3...Tension knob, 4...Fixed part, 5...
・First bead, 5a... Starting end of bead 5, 5b... Terminating end of bead 5, 6... Second bead, 6a... Starting end of bead 6, 6b... Bead End portion of 6, 7... Opening piece, 8... Auxiliary score 9.
...Tip of the stuck part, X...tear direction,!・・・
・A straight line connecting the tip 9 of the fixed part and the starting end 5a of the bead 5, m...Curve (bending line), θ...Straight line! and the axis Y-Y, a... distance in the tearing direction between the terminal end 5b of the bead 5 and the center of the fixed part 4, b... the axis between the terminal end 6b of the bead 6 and the center of the fixed part 4 Tear direction distance. - L"J LN L'J
J Dou = May = Lotto & -1

Claims (1)

[Scope of Claims] 1. An opening score is engraved on the periphery of the can lid, and a groove having a component along the tearing direction is provided on both sides of the fixed part of the tension knob provided near the opening score. a second bead is formed symmetrically between the opening score and the first bead, and a second bead is formed symmetrically on both sides of the fixing part, and a second bead is formed symmetrically between the opening score and the first bead. A straight line connecting the starting end of the bead and the tip of the fixed part is 4 in the tearing direction.
The bead is tilted between 5 and 85 degrees, and the distance between the end of the second bead and the center of the fixed part is the same as or shorter than the distance between the end of the first bead and the center of the fixed part. Features a non-vent type flu easy open can lid. 2. The non-vent type fluid easy-open can lid according to claim 1, wherein the first bead and the second bead are linear or curved.