KR910007960B1 - Easy open end - Google Patents

Abstract

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Description

Easy opening end of the can

1 is a schematic diagram of an embodiment of an EOE according to the present invention.

2a to 2c are some examples of the cross-sectional shape of the machining portion provided in the non-removable portion.

3 is a non-removing section with a machining section

4 is an explanatory diagram of a starting point of a machining unit provided in the non-removing unit.

5 is a graph showing the effect of the direction on the desired initial opening force, in which the machining portion is scored in the non-removable portion.

Figures 6a to 6g are some examples of the shape of the machining portion provided in the non-removable portion.

7 is a cross-sectional view showing a distance D between an end of the removal portion and an end of the tab fixing portion.

8 is a graph showing the effect of the distance D on the desired initial opening force.

9 is the structure of the EOE as disclosed in US Pat. No. 3,422,983.

10a to 10h are some examples of a plurality of machining parts provided in the removal part to reduce the bending strength as a second spherical example of the present invention.

11a to 11e are some examples of the cross-sectional shape of the machining part shown in FIGS. 10a to 10h.

12 is a plan view of a removal unit having a plurality of dimples.

Figure 13 is a plan view of the removal portion provided with a plurality of thin wall portion.

14A to 14D show some examples of the cross-sectional shape of the machining parts shown in FIGS. 12 and 13.

15 is a graph showing the change in the opening force from the beginning to the end of the opening.

* Explanation of symbols for the main parts of the drawings

One; EOE 2; Juice core

3; Removal unit 4; Release Tab

5; Tabbed fixing 6; Non-removable part

7; Auxiliary score 8; Machining Department

9; Cutting direction

The present invention relates to an easy opening end of a can having a partial removal formed by a principal score line (hereinafter abbreviated as EOE), ie an EOE that can substantially reduce the initial opening and cutting force of the EOE. will be.

EOE refers to the end of a container that can be opened by pulling the opening tab fixed to the partial removal section without using a mechanism such as a can opener. Because of these advantages, EOE is widely used in cans such as food cans, soda cans and beer cans.

There are several proposals so far to reduce the opening of the EOE. For example, Japanese Patent Laid-Open No. 149251/1983 proposes an EOE having a main score and an auxiliary score 7 parallel to the main score.

U.S. Patent No. 3,422,983 discloses an EOE with a secondary score 19 that is initially ruptured by pulling upwards a tab extending outward from the main score portion as shown in FIG. I'm offering.

The difficulty of opening the EOE to the user depends largely on the force required for the initial opening and tearing of the EOE removal unit.

Therefore, it is important to reduce the initial opening force required. This reduction in force ensures easy opening of the EOE.

In addition, when the change of these forces in the entire opening process as well as the reduction of the force is small, stable opening is ensured with a constant force, thereby achieving the best easy opening. If a large force is required to cut the altitude, the removal portion is removed by the large force applied thereto. This sometimes causes shock or vibration to the can body, causing the contents to overflow.

The auxiliary scores provided in Japanese Patent Laid-Open No. 149251/1983 or US Pat. No. 3,422,983 ensure the reduction of the initial opening force required. However, a large force is still required to cut the removal without decelerating to a sufficient degree.

The present invention is based on research to improve the openness of EOE. Therefore, the main object of the present invention is to easily deform in the cutting direction when opening and removing the remover with a machining portion that locally reduces the bending strength of the non-removable portion of the portion to the adjacent non-removable portion where the tab is fixed. To provide an EOE that can reduce the initial opening of the removal portion of the canned panel.

In the EOE, the machining part provided in the non-removing part is located at a point in the region between the starting point of the removing part and the straight line passing through the center of the tab fixing part perpendicular to the cutting direction, and with respect to the direction perpendicular to the cutting direction. It is formed so as to extend in two directions on both sides of the continuous or discontinuous at an angle within 1 + 15 degrees. The machining portion may be a thin wall portion formed in a V, U or groove cross section. When such a machine pulls and removes the removal part by locally reducing the strength of the non-removable part adjacent to the pull-tab fixing part, the part is easily deformed in the cutting direction of the removal part, thereby greatly reducing the initial opening force required by the EOE. Can be.

In order to further reduce the initial opening force required by the EOE, it is preferable that the distance between the end of the removal portion and the outer periphery of the pull tab fixing portion is 0.4 mm or less.

A second object of the present invention is to reduce the initial opening force required by providing a machining portion for reducing the strength of the removal portion in the portion adjacent to the fixed portion in the non-removable portion, so as to easily deform in the cutting direction of the removal portion, It is to provide an EOE that ensures easy and smooth initial opening of the removal part and subsequent fracture by having a removal part having a plurality of machining parts to alleviate the bending strength of the removal part in the cutting direction.

The machined part provided in the removal part may be a continuous or discontinuous straight line, curved line, V type or inverted V line segment in plan, all of which are designed to cross the cutting direction. Also, a plurality of thin walls or dimples may be configured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 shows a first embodiment of the present invention, in which the EOE 1 has a main score 2 which forms the removal 3. The removal section 3 has a press-formed hollow rivet at its end, i.e. at the center of or near the end of the can. The shin portion of the rivet penetrates through the small hole of the tear tab 4. The upper end of the rivet is formed with an extension head superimposed on the tab metal around the hole, thereby fixing the opening tab 4 to the removal part to form the tab fixing part 5. In addition, the non-removal portion 6 of the EOE may also have an auxiliary score 7 parallel to the main score 2.

In this embodiment, the non-removing portion 6 is provided with a machining portion 8 adjacent to the tab fixing portion 5 and is easily deformed in the cutting direction 9 at the initial opening by locally reducing its strength.

2A to 2C show some examples of the cross-sectional shape of the machining part 8. The machining part may be formed by the V-shaped groove shown in FIG. 2A, the U-shaped groove shown in FIG. 2B, or the thin wall portion shown in FIG. 2C, whereby the strength of the non-removing portion 6 is locally localized. Is reduced. The cross-sectional shape of the machining part 8 is not limited to that shown in FIG. 2, and other various shapes are possible. For example, the machining portion 8 may have a cross-sectional shape of a combination of a thin wall portion and a V-shaped groove. Preferably, the remaining thickness t of the machining part 8 is equal to or thicker than the thickness of the main score 2.

The position and scoring direction of the machining part 8 in the non-removing part 6 is of great importance in reducing the strength of the non-removing part 6 adjacent to the tab fixing part 5 so that it is easily deformed in the cutting direction 9. Do.

As shown in FIG. The machining part 8 is provided with the area | region enclosed by the inclination line 10 and 11. As shown in FIG. The inclination line 10 passes through the center of the tab fixing part 5 and starts at the intersection of the straight line 12 perpendicular to the cutting direction 9 and the score 2 and is constant in the cutting direction 9 with respect to the straight line 12. It is a line segment which is inclined at an angle and extends in both directions, and the remaining inclined line 11 passes through the end portion 3a of the removal portion 3 and is cut in the cutting direction 9 with respect to the straight line 14 perpendicular to the cutting direction 9. It is a line segment which extends in both directions from the end part 3a of the removal part 3, inclining in the opposite direction. The angle 1θ of the oblique lines 10 and 11 with respect to the straight lines 12 and 14 is 15 degrees. That is, the machining part 8 of this spherical example is provided with the diagonal line area | region enclosed by the inclination line 10 and 11 and the main score 2. As shown in FIG.

을 만족하도록 한다. 상기 두거리간의 바람직한 관계식은

이다. 기계가공부(8)의 개시점(8a)은 주 스코어(2)에 연결되거나 또는 연결되지 않을 수도 있다. 이것이 주 스코어(2)에 연결된 경우는, 기계가공부(8)의 개시점(8a)과 주 스코어(2)간의 거리 a가 1.5mm이하로 유지되는 것이 바람직하다.As shown in FIG. 4, the starting point 8a of the machining section 8 is equal to the distance d between the starting point 8a of the machining section 8 and the end 3a of the removal section 3. For distance 1 between the end 3a of the reject 3 and the center of the tabbed fixing 5, the relation is

To satisfy. The preferred relationship between the two distances is

to be. The starting point 8a of the machining section 8 may or may not be connected to the main score 2. When this is connected to the main score 2, it is preferable that the distance a between the starting point 8a of the machining part 8 and the main score 2 is maintained at 1.5 mm or less.

의 범위인 각

를 이루는 방향으로 스코어링(scoring)할 수 있다. 각도

의 범위가 더욱 바람직하다.The machining part 8 is perpendicular to the cutting direction 9 or with respect to this vertical direction.

Angle that is the range of

Scoring may be performed in a direction of forming. Angle

The range of is more preferable.

가 EOE에 요구되는 초기 개봉력에 미치는 영향을 도시한 것이다. 도면에서 알수 있는 바와 같이, 각

가 약 20`이하일 때, 초기 개봉력이 강하하기 시작하며, 각

가 15° 이하에서 그 효과는 더욱 분명하게 되며, 각

가 12.5⁰이하일 때, 초기 개봉력은 최소이다. 이들 실험에 이용된 EOE(1)는 두께 0.23mm, 소려도 T4인 주석도강으로 만든 것이며, 주 스코어(2)와 기계가공부의 나머지 두께는 65um이다.5 is the slope

Shows the effect on the initial opening force required by the EOE. As can be seen in the figure,

Is less than about 20`, the initial opening force starts to drop,

Below 15 ° the effect becomes more pronounced,

When is less than 12.5 ⁰ , the initial opening force is minimal. The EOE (1) used in these experiments was made of tin-coated steel with a thickness of 0.23mm and a degree of T4. The main score (2) and the remaining thickness of the machined part were 65um.

Bending of the non-removing portion 6 of the portion with the machining portion 8 scored in the direction determined by the above-described method from the starting point 8a determined by the above-described method at the non-removing portion 6 adjacent to the tab fixing portion 5. The strength is locally reduced and easily deformed in the cutting direction. This is because the stress is concentrated at the opening start point, and thus the initial opening force of the EOE is greatly reduced. That is, the initial force required for opening the can is reduced, so that the can can be easily opened.

6A to 6G are plan views showing some shapes of the machining part 8. As shown in FIG. 6A, the machining portion 8 may constitute a pair of thin wall portions having a V-shaped or U-shaped cross section and linear in a direction perpendicular to the cutting direction. As shown in FIG. 6B, the machining portion 8 may constitute a pair of thin wall portions that are linear. The machine pair 8 can be a wide thin walled portion as shown in FIG. 6C (see also FIG. 2C). As shown in FIG. 6D, the machining portion 8 may be a pair of thin wall portions whose starting point 8a is in a straight line separated from the main score 2. As shown in FIG. 6E, the machining portion may be a pair of thin wall portions whose starting point is separated from the main score 2 and is discontinuous. As shown in FIG. 6F, the machining unit 10 may have a shape having a wide cylindrical cross section as shown in FIG. 6E. Alternatively, the machining part 8 may be curved as shown in FIG. 6G. The length of each component of the pair of machining portions 8 is preferably 0.5 mm or more.

Table 1 shows the test results of the initial opening force of the can as an EOE having a machined part of different shapes made of tin steel having a thickness of 0.23 mm and size T4. Comparative Examples 1 and 2 in the table each have a conventional EOE without a machining part 8 and an auxiliary score 7 formed in the non-removable part cutting direction as shown in FIG. 9 (Unpublished Patent No. 3,422,983). One conventional one is shown. On the other hand, the seventh embodiment is the case of the EOE having the machining section 8 shown in Figs. 6A to 6G, respectively. The distance D shown in FIG. 7 in the EOE of Example 1 in Example 7 was 0.4 mm.

TABLE 1

Note: Initial opening force unit is kgf

As can be seen from Table 1, the bending strength of the non-removable portion adjacent to the tab fixing portion 5 was locally reduced in order to facilitate the deformation in the cutting direction by engraving the machining portion 8 to EOE has low initial opening. Thus, the opening of the EOE may be initiated without great effort.

In addition, the initial opening force can be reduced by maintaining the distance D at a predetermined value, and the distance D is the end portion 3a and the tab fixing portion 5 of the removal portion 3 in the XX axis direction parallel to the cutting direction 9. Is the interval between the perimeters of. 7 is an enlarged view of the outside of the tab fixing part (5). In more detail, in the present invention, the distance D between the end portion 3a of the removal portion 3 formed by the main score 2 and the outer circumference of the tab fixing portion 5 is preferably about 0.4 mm or less, and more preferably, Less than 0.3mm

8 shows the effect of the distance D on the required initial opening force.

As the distance D becomes smaller, the initial opening force rapidly drops at the distance D of about 0.4 mm. This is considered to be because stress is more concentrated at the end 3a adjacent to the main score 2 by the very rigid tap fixing part 5. When the distance D is 0.3 mm or less, the initial opening force becomes almost constant at a low value. In view of the ease of press molding using a metal mold, the distance D is preferably at least 0.1 mm.

In FIG. 8, curve (a) shows how the initial opening force of the present embodiment, that is, the EOE with the machining part 8, changes almost with the change of D, and curve (b) shows that the machine is for comparison. EOE's initial unsealing force without study (8) is related to distance D.

In both cases, the required initial opening force was found to drop rapidly when the distance D was about 0.4 mm.

Referring to Figure 10 another embodiment of the present invention will be described.

10A to 10D are plan views showing some examples of the shapes of the plurality of machining parts 15, wherein the machining parts 15 for reducing the bending strength of the removal part 3 in the cutting direction are doubled ( It is formed to intersect the longitudinal center line XX of 3). 10E to 10H are plan views of the machining portion 15 provided in the removal portion 3 so as not to intersect the longitudinal center line X-X.

11A to 11D show some examples of the cross-sectional shape of the linear or arc machined portion 15 shown in FIGS. 10A to 10H. Machining portion 15 may be a V-shaped groove or thin wall portion as shown in Figure 11a to 11b. These may constitute square or curved bends, as shown in FIG. 11C or 11D. The cross section of the machining part 15 may be a U-shaped groove shown in Fig. 11E. Alternatively, the machining part 15 may be an inner or outer cross-sectional bead.

It is possible to reduce the bending strength of the removal part 3 in the cutting direction 9 by engraving a plurality of machining parts 15. As a result, the removal portion 3 can be deflected along the X-X axis while being cut in the cutting direction 9. This makes it easier to cut off the removal part 3 along the main score 2 by concentrating the cutting force on the juice core 2. Thus, when the removal portion is separated from the can-end panel, excessive force can be prevented.

The pitch b (see also FIG. 10A to FIG. 10H) between each adjacent machining part 15 formed in the removing part 3 is preferably 2 to 5 mm. With the pitch b in this range, the bending strength of the reduction of the removal portion 3 imparted by the machining portion 15 is continuously spread so that the cutting force reduction by the machining portion 15 is efficiently achieved. When the pitch b exceeds 5 mm, the required cutting force varies greatly along the score in the cutting direction 9 to prevent stable cutting. If the pitch b is less than 2 mm, the removal part 3 will bend more easily than required. This may result in the removal 3 being removed during cutting.

When the machining part 15 is a V type or an inverted V type, viewed from the top, the angle β formed between one side of the V or reverse V type machining part 15 and the XX axis normal (see FIG. 10A to FIG. 10H) 45 ° is preferred. When the angle β exceeds 45 °, the effect of the machining part 15 that reduces the bending strength and facilitates bending of the removal part 3 along the XX axis is reduced.

In the present exemplary embodiment shown in FIGS. 10A to 10H, a pair or multiple pairs of machining portions 8 formed symmetrically on the XX axis are provided at a portion adjacent to the tab fixing portion 5 of the non-removing portion 6. . The machining part 8 of this structure reduces the initial opening force. The machining section 8 together with the plurality of machining sections 15 formed in the removal section 3 reduces the bending strength in the cutting direction to allow the EOE to open smoothly and as easily as possible with a small force.

Instead of the machining part 15, the removal part may be divided into a plurality of parts as shown in FIG. 13, and the thin wall part 18 may be provided in each part. The thin wall portion 18 may be formed on the upper or lower surface of the removal portion 3.

FIG. 12 is a modification of the removal section 3, and includes a plurality of dimples 17 instead of the thin wall section 18. As shown in FIG. As shown in FIG. 14A to FIG. 14D, the dimple 17 may form the upper or lower surface of the removal portion 3 or may be formed as an irregular surface in the removal portion 3. In addition, the cross-sectional shape of the dimple may be rectangular, U-shaped, circular or trapezoidal.

The bending strength of the removal portion 3 in the cutting direction 9 is reduced by the thin wall portion 18 or the dimple 17. In addition, even when the irregular surface is provided, the bending strength of the removal part 3 can be reduced. Thus, the main portion 2 around the tab fixing portion 5 adjacent to the end portion 3a of the removal portion 3 is easily deformed at the beginning of the opening so that the deformation of the removal portion 3 at the beginning of the opening is deformed. You can focus on the part. As a result, not only the opening force required at the beginning of the opening can be reduced, but also the cutting of the removing section 3 along the juice core 2 is facilitated. In addition, the cut made in this way requires a small force, thereby preventing excessive force when the removal portion is separated from the end panel.

When forming a plurality of dimples 17 shown in FIG. 12, the spacing S between two adjacent dimples 17 is preferably 0.5 to 2 mm. That is, when the interval S is set to a value within the above range, the bending force of each part of the removal part 3 whose bending strength is reduced by the dimple 17 can lead to the similar motion of the adjacent part, thus cutting force The overall effect of reducing this can be reliably achieved. On the other hand, if the spacing S exceeds 2 mm, the cutting force changes to prevent smooth cutting operation. The spacing S is less than 0.5 mm, and the bending strength of the remover may be excessively reduced so that a part of the remover may fall and be separated.

The present invention is not limited to the embodiment illustrated in FIGS. 10 to 14 and includes other methods of machining as long as the reduction in bending strength of the removal portion along the cutting direction can be achieved by the machining portion. do. For example, instead of the thin wall portion 18 or the dimple 18, a letter indicating the brand name or the contents of the can can be used.

The EOE of the present invention may be of a type having a shallow secondary score 7 formed along and parallel to the major score 2.

FIG. 15 is a graph showing the variation in the opening force from the initial opening to the final removal of the removal unit 3.

The solid line J in the figure shows the change in force required for opening of the EOE of the present invention having a non-removing portion and a removing portion having a machining portion 8 and a machining portion 15, respectively, while the dashed line k is A conventional EOE which does not have both the machining part 8 and the machining part 15 is related.

As can be seen from the figure, in the case of the can opening and closing shown by the dotted line K, a large force is required and the opening force varies greatly. This shocks or vibrates the can body during opening, preventing smooth opening. On the other hand, in the case of the can-opening of this spherical example shown by the solid line J, a small force is required from the initial opening to the removal of the removal section 3, and the degree of fluctuation of the required force is reduced. This allows the can to be opened to be opened with a small force without giving any impact or vibration to the can body.

As described above, the gap D (see FIG. 7) between the end portion 3a of the removal portion 3 and the outer circumference of the fixing portion 5 is made smaller than that of the EOE, which has a reduced required opening force and the variation thereof is small. Initial opening force can be further reduced.

Table 2 shows the results of the initial opening and cutting forces of various EOEs made of tin-coated steel with a thickness of 0.23 mm and size of T4. Comparative Examples 1 and 2 in the table refer to conventional EOEs without machined parts and conventional EOEs with auxiliary scores 19 formed in the non-removable part cutting direction 9 as shown in FIG. 3,422,983). On the other hand, 8 in Examples 1 are those of the EOE shown in FIGS. 10A to 10H, respectively. The EOE of these present spherical examples has a distance D of 0.4 mm shown in FIG.

TABLE 2

Note: Initial opening force unit is kgf

As can be seen from Table 2, the bending strength of the portion adjacent to the tab fixing portion 5 of the non-removable portion 6 is locally reduced to facilitate the deformation of the cutting direction 9 by the machining portion 8. In the case of Embodiments 1 to 8, where the bending strength of the removal section 3 is also reduced in the cutting direction, the initial opening force and the cutting force required are reduced. Thus, the EOE of this embodiment can be easily opened without the need for great force.

As the material for the EOE 1, tin-plated steel or an aluminum sheet is usually used. However, it is not limitative and any of the following materials can be used. (1) iron or iron alloys, or nonferrous metals such as aluminum and aluminum alloys; (2) A metal material having a surface treatment such as plating or coating on the material of (1); (3) a composite metal material obtained by bonding a layered organic material such as a resin to the material of (1) and / or the metal material of (2); (4) a composite metal material obtained by superimposing a material of (1) and / or a metal material layer of different (2) sums; (4) A composite metal material obtained by superimposing the material of (1) and / or the metal material layers of different (2).

In the present invention, the initial opening force required can be greatly reduced as a result of opening the opening very easily.

Claims (8)

In the easy opening end 1 of the can consisting of a panel, a removing portion 3 formed on the panel formed by the main score 2, and an opening tab 4 fixed to the removing portion, the tab fixing portion of the non-removing portion 6 is provided. In order to locally lower the bending strength of the portion adjacent to (5) to facilitate deformation in the cutting direction, a straight line through which the starting point passes through the center of the tab fixing portion perpendicular to the cutting direction 9 and the end portion 3a of the removing portion 3a. Is provided at the non-removing section at a point in the area between the sections and formed so as to extend both sides continuously or discontinuously within a range of 1 + 15 ° with respect to the direction perpendicular to the cutting direction. The can of the can which is characterized by the opening end. 2. The can-opening end of a can according to claim 1, wherein the machining portion (8) is a thin wall portion provided by machining the non-removing portion (6) so that its cross section is V-shaped, U-shaped or groove-shaped. The can-opening end of the can according to claim 1, wherein the distance between the end portion 3a of the removal portion and the outer circumference of the tab fixing portion 5 is 0.4 mm or less. In the opening end 1 of the can which comprises the removal part 3 on the panel formed by the panel, the main score 2, and the opening tab 4 fixed to the removal part, the tab fixing part of the non-removal part 6 is carried out. In order to ease the deformation in the cutting direction by locally lowering the bending strength of the portion adjacent to (5), between the straight line passing through the center of the tab fixing part perpendicular to the cutting direction 9 and the end portion 3a of the removal part. The non-removing portion is provided with a machining portion 8 formed to be positioned at any point of the region of the blade and to extend both sides continuously or discontinuously within a range of 1 + 15 ° with respect to the direction perpendicular to the cutting direction. The removing part has a plurality of machining parts 15 for reducing the bending strength thereof so as to bend smoothly in the cutting direction. The can-opening end of the can according to claim 4, wherein the machining part (15) provided in the removing part constitutes a plurality of machining parts crossing the cutting direction. The can of claim 5, wherein the machining unit (15) provided in the removal unit constitutes a plurality of machining units that cross the cutting direction but do not cross the center line in the cutting direction of the removal unit. Opening end. 5. The can-opening end of a can according to claim 4, characterized in that the machining portion (15) formed in the removal portion constitutes a plurality of thin wall portions (18) or dimples (17). The method according to any one of claims 4, 5, and 6, wherein the machining portion 15 formed in the removal portion is a straight line, a curved line, a V shape, an inverted V shape score, a thin wall portion, a bent portion, or a bead. Easy opening end of the can.

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