JPH01240445A - Full-easy-open can lid of non-bent type - Google Patents

Abstract

PURPOSE:To increase rigidity of an opening piece to reduce force required for opening a can after initial opening and prevent contents of the can from bering damaged by a method wherein two beads whose start and finish ends are positionally specified are provided. CONSTITUTION:A line l which connects a first end 5a of a start bead 5 and an edge 9 of a fixing portion 4 is tilted with an angle theta with respect to an axis X-Y. When the angle theta exceeds 85 degrees, an opening lid can be easily bent above the start bead 5, and the opening lid cannot be opened deeply in the breaking direction at the initial opening. This prevents moment from being applied at the time of breaking and a breaking force from being reduced after the initial opening. On the other hand, when the angle theta is less than 45 degrees, not only the force applied during the first opening is increased but also a force for starting an opening at a start point 21 for starting an initial opening is increased. The angle theta is thus limited within a range from 45 to 80 degrees. In order to prevent indication depth (h) which may damage contents 10 of the can from increasing, an end edge 6 of a finish bead 6 is positioned longer than the end edge 5b of the start bead 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-vent type fluid easy-open can lid that allows the opening piece to be easily torn off and separated from the can lid after the opening of the can.

[Prior Art] - 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 cans 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 a Flueasy-open can lid, the tip of the opening piece to which the tension knob is fixed is first bent inside the can body to begin opening.

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

In this regard, the initial opening format is different between a partial easy-open can lid and a full easy-open can lid. In addition, with a full easy-open can lid, the radius of curvature of the apex shape on the side where opening starts is larger than that of a partial easy-open can lid, making it difficult for stress to concentrate at the beginning of opening, resulting in poor initial opening performance. Inferior. Furthermore, since the opening piece of the full easy-open can lid is larger than that of the partial easy-open can lid, the initial tearing force for opening the can is very large.

For this reason, the full easy-open can lid has inferior can opening performance compared to the partial easy-open can lid.

Various studies have been conducted to improve the opening performance of this Flu Easy Open can lid. For example, by forming a destruction score on the line of the opening score engraved 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 it is compared to the first destruction part. This is proposed in Japanese Utility Model Application Publication No. 57-43239. In this way, by thinning the part above the opening score line, the initial can opening performance is improved. Further, in Japanese Patent Application Laid-Open No. 52-94291, initial can opening performance is improved by defining the distance between the nose and the closest opening score. On the other hand, in the case of a non-vent 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 vent score, for example,
As proposed in Japanese Patent No. 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,
So far, no effective means have been proposed for reducing the tearing force after initial opening.

[Problem that the invention seeks to solve]

By the way, the ease and difficulty of opening that people feel when opening an easy-open can lid is determined not only by the initial opening performance at the beginning of opening, but also by the time when the can lid, which has started opening, is torn from the can body. It is greatly influenced by the size of the force. For example, even if a can has excellent initial opening properties, if the tearing force is large, the impact and vibrations generated when tearing the can lid are 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 improve the openability of a Flueasy-open can lid by reducing this tearing force.

[Means and effects for solving the problem] Therefore, the present inventors divided the bending properties of the opening piece in the tearing direction into a strong part and a weak part in a non-vent type Fluid Easy Open can lid, and It has been found that by specifying the position of the boundary portion, can opening performance is improved compared to the conventional method.

The non-vent type fluid easy-open can lid of the present invention has an opening score engraved on the periphery of the can lid, and a tension tab provided near the opening score on both sides of the fixed part of the pull tab in the tearing direction. A second bead along the opening score is formed symmetrically with a first bead having a component along the opening score, and a second bead along the opening score is formed on both sides of the fixing part around the opening piece that is VB with the opening score. symmetrically formed, and a straight line connecting the starting end of the first bead or the second bead and the tip of the fixed part is inclined between 45 degrees and 85 degrees with respect to the tearing direction,
In addition, the distance between the end of the second bead and the center of the fixed portion is larger than the distance between the end of the first bead and the center of the fixed portion. 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. The rigidity of the opening piece increases as the number of beads increases, but two pairs is sufficient.

As the length of the bead becomes longer, the opening piece opens deeper in the tearing direction at the initial opening, and the length of the arm of the bending moment acting on the opening piece increases when the opening piece is torn following the initial opening, so The tearing force after the initial opening is reduced (but the pushing depth of the opening piece at the initial opening also increases, which may damage the contents of the can. Therefore, according to the present invention, the tearing force after the initial opening is The present invention is characterized by a non-vent type fluid easy-to-open can lid that reduces the subsequent tearing force and has good opening performance in consideration of not damaging the contents of the can.

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 part 4 is formed in which a tension knob 3 is attached to a can lid l. The fixed portion 4 was centered on the axis YY parallel to the tearing direction X. A pair of first beads 5 and a pair of second beads 6 provided along the opening score 2 are formed symmetrically. Also, a straight line l connecting the starting end 5a of this first bead 5 and the tip 9 of the fixed l154
is inclined at an angle θ with respect to the axis Y-Y.

Next, the operation until the can lid l 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 starting point 2a, and the opening is gradually carried out along the opening score 2 until the intersection 2b of the straight line l and the opening score 2. be exposed. Further, when 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 intersection point 2C. Here, the intersection 2C is the intersection of the opening score 2 and the curve m passing through the terminal end 5b of the first bead 5 and the terminal end 6b of the second bead 6, and is the end point of the initial opening. During the initial opening, the can lid l 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 further, when re-hooking your finger on the outside of the tension knob 3 and pulling this opening piece 7 above the can lid I to tear the opening piece 7, the length of the arm of the bending moment acting on the opening piece 7 Since the opening is large, the tearing force after the 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, no moment can be applied during tearing, and the tearing force after initial opening cannot be reduced. On the other hand, the angle θ
However, if the angle θ is less than 45 degrees, the force during the initial opening becomes large (not only does it become large, but also the opening starting force at the initial opening starting point 2a becomes large. Therefore, the angle θ is specified to be between 45 degrees and 85 degrees, In order to reduce the starting force, the force during the initial opening, and the tearing force after the initial opening in a well-balanced manner, the angle θ should be set to 6.
It is preferable to set it as 0-80 degrees.

If the pushing depth h of the opening piece 7 is large at the initial opening of 06, the contents IO of the can may be damaged as shown in FIG. 2 (1). In order to prevent this indentation depth h from becoming large, the terminal end 6 of the second bead 6 must be
It is effective to position b longer than the terminal end 5b of the first bead 5. For example, if the contents of the can are easily damaged, such as fish or fruit, the tearing direction Set the distance aa to 15I11 or less, and
An opening piece 7 between the terminal end 6b of the bead 6 and the center of the fixed part 4
The distance fib in the tearing direction X is preferably 25ff111 or less. By making the terminal end 6b longer than the terminal end 5b in this way, the bending of the opening piece 7 at the initial opening becomes a curve m, and since the opening piece 7 bends smoothly as shown in FIG. becomes smaller. In addition, in the case of powders and liquids such as seaweed and powdered milk, which do not damage the contents 10 even if the pushing depth h is large, it is better to increase the length of the arm of the bending moment after the initial opening. The tearing force decreases further, so the distance a can be set to more than 15 m, and the distance can be set to more than 25 m, respectively, to near the final opening of the score.

Therefore, it is possible to obtain a non-vent type fluid easy-open can lid that not only reduces the tearing force after initial opening but also has good opening performance in consideration of the contents of the can.

The first bead 5 is necessary to form the length of the arm that causes a bending moment during tearing, and in order to strengthen the bending rigidity of the opening piece 7 in the tearing direction It is set up in However, this first bead 5 can also be inclined at an angle α with respect to the axis Y-Y, as shown in FIG. first bead 5
The bending rigidity 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 difficult to bend in the middle of the bead. Angle α
When the angle is more negative than 110 degrees, the first bead 5 approaches the fixed portion 4, which becomes an obstacle in riveting.

Therefore, the angle α of the first bead 5 ranges from -10 degrees to 45 degrees.
Preferably.

However, if the angle α is negative, it means that the mutual spacing between the first beads 5 is narrowed along the tearing direction Indicates that Also, the distance a between the St FJ portion 5b of the first bead 5 and the center of the fixed portion 4
is preferably greater than or equal to the diameter of the fixed portion 4 in order to exhibit the effect of the second bead 6.

The second bead 6 not only assists the rigidity of the first bead 5 (but also increases the rigidity along the opening score 2 so that the opening piece 7 can be opened deeply in the tearing direction X at the initial opening. Therefore, it is provided along the opening score 2.

This is particularly effective when the can diameter of the can lid 1 becomes large. Therefore, the lower limit of the distance between the terminal end 6b of the second bead 6 and the center of the fixed part 4 is 4 mm.

6 for large diameter cans of type 307 (diameter 3'/, inch) or larger.
It is preferable to set it to ms. Further, as described above, by making the position of the terminal end 6b longer than the terminal end 5b, there is an effect of reducing the pushing depth h.

Note that even if these two pairs of beads have a linear or curved shape, they can have the above-mentioned effect. Also,
At least one of the two pairs of bead starting ends 5a, 6a is straight! It can be anywhere on the straight line as long as it is above . The starting ends of these two pairs of beads 5 and 6 may be separated from each other, or may be located at the same position and may be partially 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. In this figure, θ is the angle formed by the straight line f connecting the starting end 5a of the first bead 5 and the tip 9 of the fixed part and the Y-Y axis,
θ6 is the angle formed between the straight line 12 connecting the starting end 6a of the second bead 6 and the tip 9 of the fixed portion and the Y-Y axis. In the case of the present invention, θ is θ3. Refers to the smaller value of θ6.

In the present invention, in FIG. 4, θ, = θ, (in this case θ = θ
, = θ, ), the effect of the present invention can be maximized, but as shown in FIG. As shown in 2, even if the angle θ is >θ6 (in this case, θ=06), the effects of the present invention can be fully exhibited as long as the range of 0245 to 85 degrees is satisfied.

In the case of θ5, the starting end 6 of the second bead 6
a is the tearing direction X when viewed from the terminal end 5b of the first bead 5
θS〉θ.

In this case, the starting end 5a of the bead 5 is preferably located in the direction opposite to the tearing direction .

Further, the can lid 1 may be provided with an auxiliary score 8 along the opening score 2. Further, the flue-easy-open 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 represented by 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) Above (1) and Composite metal material (4) in which an organic material such as a resin is bonded to the metal material of (2) in a layered manner Composite metal material in which dissimilar metal materials of (1) and (2) are bonded together in a layered manner [Example] Can We used T-4 tin plate with a thickness of 0.23 mm as the lid 1, and produced various types of 301-type (3'/rm inch) Fluid Easy-Open can lids with an opening score of 2 and a score remaining thickness of 50 m. Table 1 shows the measurement results of the tearing force and indentation depth h after the initial opening.

In the same table, a conventional Flu Easy Open can lid that does not have a bead is listed as a comparative example.

On the other hand, Examples 1 to 4 are Flueasy-open can lids having the shape shown in FIG.

As is clear from Table 1, the tearing force after initial opening is lower in Examples 1, 2, and 3 in which beads were provided compared to the comparative example. This indicates that the can can be opened easily without applying much force to the can lid. Also, Example 1.
Nos. 2 and 4 have a small indentation depth h. This indicates that the contents will not be damaged.

〔Effect of the invention〕

As explained above, the non-vent type fluid easy-open can lid of the present invention has two parts that define the position of the starting end.
By providing a bead, the rigidity of the opening piece is increased and the opening force after the initial opening is reduced, and the position of the end of the bead is defined to prevent damage to the contents of the can. A can lid with excellent can properties can be obtained.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the Flueasy-open can lid of the present invention, Fig. 2 shows how the contents are damaged when opened, Fig. 3 shows the angle α, and Fig. 4 shows the implementation of the present invention. It explains the situation. Patent applicant: Nippon Steel Corporation Agent: Masu Kobori (and 2 others) Figure 1 Figure 2 Figure 3 α: Angle between bead 5 and Tsumugi Y-Y Figure 4 ■ Procedural amendment Kunio Ogawa, Commissioner of the Japan Patent Office, dated May 1986, 1. Indication of the case: 1988 Patent Application No. 298047 2. Name of the invention: Non-vent type Flueasy Open Can Lid 3. Person making the amendment Relationship to the case Patent applicant 6, content of amendment (1) Page 8, line 17 of the specification, “up to intersection 2b” was changed to “
Correct to "up to the vicinity of intersection 2b". (2) Correct "up to intersection 2C" in the first line of page 9 to "up to near intersection 2C". (3) Correct the ``end point'' in the 5th line of page 9 to ``haboba end point''. (4) Change ``Figure 2 2'' to ``Figure 2 (2)'' on page 11, line 4.
”. (5) Change “Figure 4 1” to “Figure 4 [1]” on page 14, line 7.
”. (6) On page 14, line 9, “Figure 4 2” was changed to “Figure 4 (2)”
”. (7) Direct r of distance a in Example 3 in Table 1 on page 16 of the same
50mm" is corrected to r4Qm+J. (8) "1.2.3" in the 5th line from the bottom of page 16
Corrected to ゜2.3 and 4. April 10, 1989 Director General of the Japan Patent Office Yoshi 1) Moon Yi r.
l. Indication of the case Patent Application No. 298047 of 1988 2. Name of the invention Non-vent type Flueasy Open Can Lid 3. Person making the amendment Relationship to the case Patent Applicant Address 2 Otemachi, Chiyoda-ku, Tokyo No. 6-3 Name (665) Nippon Steel Corporation Representative Yutaka Saito 4, Agent Specification (1) ``Centrality'' on page 6, line 6 of the specification is amended to ``rigidity.'' (2) "Tip 9... angle θ" in lines 3 and 4 on page 7 is corrected as follows. "Angle with respect to the tearing direction of the straight line connecting the tip and the starting end of the first or second bead" (3), page 8, No. 8
~ Correct line 9 "Bead 6" to "Bead 6". (4) Page 15, line 6, “Σ other than aluminum plate”
``Including the aluminum plate''.

Claims (1)

[Scope of Claims] 1. An opening score is engraved on the periphery of the can lid, and 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 first bead is formed symmetrically, and a second bead along the opening score is formed symmetrically on both sides of the fixing part around the opening piece surrounded by the opening score. A straight line connecting the starting end of the first bead or the second bead and the tip of the fixed part is inclined between 45 and 85 degrees with respect to the tearing direction, and the terminal end of the second bead and the center of the fixed part are A non-vent type fluid easy-open can lid characterized in that the distance between the end of the first bead and the center of the fixed part is larger than the distance between the end of the first bead and the center of the fixed part. 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.