JPH09327738A - Construction of line part to be cut off of lid in can body and forming method of line part to be cut off of lid in can body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of burr at least on the peripheral edge of a lid for one side face of the lid more outside in the thickness direction of the lid in cutting off the lid from a can main body. SOLUTION: In the a can body, in which a line part 5 to be cut off is arranged in a lid 3a arranged at an opening of a can main body 2, and at least a part of the lid 3a can be cut off from the can main body 2 through the line part 5 to be cut off by pulling operation of the lid 3a against the can main body 2, by respectively forming linear recessed parts 6, 7 at one side face and other side face of the lid 3a in a manner facing each other, and the internal between bottom faces of these recessed parts 6, 7 is made to be the line part 5 to be cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a can body for hermetically packing soft drinks, fruits, etc., in order to enable the lid of the can body to be separated from the can body. The present invention relates to a structure of a cut line portion to be formed and a method of forming the cut line portion.

[0002]

2. Description of the Related Art A can body of this type, which is generally used for canning and soft drinks, is provided with a cut line portion thinner than the wall thickness of the lid at a peripheral portion of the lid, and a tab attached to the lid. By pulling with a hand, it can be seen that the lid is arbitrarily separated from the main body of the can via the line to be cut.

By the way, as a method of forming the above-mentioned cut line portion on the lid, conventionally, as schematically shown in FIG.
Press surface P having a V-shaped cross section that tapers toward the tip
A V-shaped groove C is press-molded on the upper side surface of the lid B by using the blade A having the above-mentioned shape, and the portion thinned by the V-shaped groove C is the cut line portion D.

[0004]

However, in the above-mentioned can body, due to the shearing of the cut line portion D accompanying the pulling operation of the lid B, the periphery of the lid B is shown in FIGS. 7 and 8. As described above, a sharp burr E protruding downward from the lower side surface of the lid B is generated, so that, for example, when the lid B is directly held by a hand,
There is a possibility that your hand may get caught in the burr B and get injured.

Even when the V-shaped groove C is press-molded on the lower surface of the lid B, due to the shearing of the line D to be cut due to the pulling operation of the lid C, the can body side is attached to the periphery of the can body side. A sharp burr E protruding upward from the upper side surface is generated, and when the mouth or the like touches the peripheral edge of the opening formed on the can body side, the lips or the like may be caught by the burr E and injured. The present invention was developed in view of the above circumstances, and it is an object of the present invention to provide at least a peripheral edge of a lid with respect to one side surface of the lid when the lid is separated from the can body. (EN) It is an object to provide a structure of a line to be cut off of a lid in a can body capable of suppressing the occurrence of burrs outward, and a method of forming such a line to be cut off.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 has a lid 3a provided at an opening of a can body 2 to be cut off with a thickness thinner than the thickness of the lid 3a. A can body in which at least a part of the lid 3a can be separated from the can body 2 through the line to be cut 5 by providing the line portion 5 and pulling the lid 3a with respect to the can body 2.
Line-shaped recesses 6 on one side and the other side of the lid 3a, respectively.
7 are formed so as to face each other, and the cut line portion 5 is formed between the bottom surfaces of these recesses 6 and 7.

According to a second aspect of the invention, in the first aspect of the invention, the inner bottom surface of one recess 6 formed in the lid 3a has a V-shaped cross section, and the inner bottom surface of the other recess 7 is formed. It was a wide flat surface. According to the third aspect of the present invention, the line 3 to be cut, which is thinner than the wall thickness of the lid 3a, is provided on the lid 3a provided in the opening of the can body 2, and the pulling operation of the lid 3a with respect to the can body 2 is performed. A method of forming the cutoff line portion 5 in a can body, wherein at least a part of the lid 3a can be separated from the can main body 2 via the cutoff line portion 5, the method comprising: The first blade body 8 having a tapered pressing surface 81 having a V-shaped cross section and the second blade body 9 having a pressing surface 91 wider than the tip of the first blade body 8 are opposed to each other. These blades 8 and 9
By the pressing operation described above, a recess 6 having a V-shaped cross section and a recess 7 whose inner bottom surface is a wide flat surface are press-formed on both side surfaces of the lid 3a so as to face each other. 6.7
The cut-off line portion 5 is formed between them.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A can body designated by reference numeral 1 in the drawings is
For example, it is used to pack soft drinks, fruits, peanuts, etc. in a sealed manner (so-called canned food),
The can body 1 is made of a steel material in a cylindrical shape, and the can body 2 is also made of a steel material.
It is composed of upper and lower lids 3a and 3b that close the openings at both ends of the can body 2, and these lids 3a and 3b are fitted to both ends of the can body 2.

In the embodiment shown in FIGS. 1 to 4, the upper lid 3
While the tab 4 is fixed to the upper side surface of a, a thin cut line portion 5 thinner than the wall thickness T of the upper lid 3a is formed on substantially the entire circumference of the peripheral portion of the upper lid 3a. By shearing the cut-off line portion 5 associated with the pulling operation of the upper lid 3a with respect to 2, it is possible to separate almost the entire circumference of the upper lid 3a, in other words, leave the can body 2 leaving a part of the entire circumference. .

The cut-off line portion 5 has line-shaped recesses 6 and 7 on substantially the entire circumference of the upper side surface and the lower side surface of the upper lid 3a.
Are formed so as to face each other, and the cutoff line portion 5 is formed between the inner bottom surfaces of these recesses 6 and 7. In the embodiment shown in FIGS. 1 to 5, the cut line portion 5 is formed on the upper side surface of the upper lid 3a. Recess 6
The inner bottom surface 61 has a V-shaped cross section, and the inner bottom surface 71 of the recess 7 formed on the lower side surface of the upper lid 3a has a wide flat surface.

As a method for forming the above-mentioned cut line 5 on the upper lid 3a, as shown schematically in FIG. 2, a first press face 81 having a V-shaped cross section which is tapered toward the tip is provided. The first blade 8 and the second blade 9 having the pressing surface 91 formed of a flat surface wider than the tip of the first blade 8 are provided on the upper lid 3
The upper and lower blades 8 and 9 are arranged so as to face each other with a sandwiched therebetween, and a pressing machine presses these two blade bodies 8 and 9 to form a concave portion 6 having a V-shaped cross section on the upper side surface of the upper lid 3a. On the lower side surface, the recess 7 whose inner bottom surface 71 is a wide flat surface is simultaneously press-formed to form the cut line 5 between these recesses 6 and 7 in the upper lid 3a.

By the way, the pressing surface 91 of the second blade 9 is
Since the first blade body 8 is formed in a plane wider than the tip of the press surface 81, the position where the second blade body 9 is installed with respect to the first blade body 8 at the time of press molding by the above-described double blade bodies 8 and 9 or The installation position of the first blade 8 with respect to the second blade 9 is
In FIG. 2, the thickness of the line to be cut 5 does not change even if it is slightly displaced in the direction of the arrow W. In other words, the line to be cut 5 can have a desired thickness, and thus the double-edged body can be obtained. Setting to the 8 or 9 press machine can be done so easily, and the opening work of the upper lid 3a can always be performed smoothly.

In the can body formed as described above, the upper lid 3
As the outer peripheral portion of the upper lid 3a is separated from the can main body 2 through the cut line portion 5 by pulling the tab 4 provided on the a,
Due to the shearing of the cut line portion 5, the outer peripheral edge of the upper lid 3a is
A burr K1 extending in a direction opposite to the pulling direction of the upper lid 3a (the arrow X direction in FIG. 4) is generated, and a burr K2 extending in the same direction as the pulling direction of the upper lid 3a is formed on the inner peripheral edge of the opening on the can body 2 side. Occurs.

However, since the line to be cut 5, which is the site where the burrs K1 and K2 are generated, is located between the inner bottom surfaces of the recesses 6 and 7, in other words, in the thickness direction of the lid 3a. Since it is located in the central portion, the burr K1 generated on the outer peripheral edge of the upper lid 3a is prevented from protruding at its tip end below the lower side surface of the lid 3b along the outer peripheral edge, and the main body of the can. Even in the burr K2 generated on the inner peripheral edge of the opening on the second side, the tip portion of the burr K2 is suppressed from protruding above the upper side surface on the can body 2 side along the inner peripheral edge.

Therefore, for example, when the upper lid 3b is directly held by the hand, there is little risk that the hand is caught by the burr K1 and even if the mouth or the like touches the periphery of the opening formed on the can body 2 side, the lips, etc. Is not caught in the burr K2. In the embodiment described above, the cut line portion 5 is formed on substantially the entire circumference of the peripheral portion of the upper lid 3a. However, as shown in FIG. 5, the cut line portion 5 having a tongue shape in plan view is formed only around the tab 4. You may form.

In the above embodiment, the inner bottom surface 61 of the recess 6 formed on the upper side surface of the upper lid 3a has a V-shaped cross section,
Although the inner bottom surface 71 of the recess 7 formed on the lower side surface of the upper lid 3a has a wide flat surface, the inner bottom surface 71 of the recess 7 formed on the lower side surface of the upper lid 3a has a V-shaped cross section, and the upper lid 3a The inner bottom surface 61 of the recess 6 formed on the upper side surface may be a wide flat surface, or the recess 7 formed on the lower side surface of the upper lid 3a.
The recess 6 formed on the inner bottom surface 71 of the base and the upper side surface of the upper lid 3a
Any of the inner bottom surfaces 61 may have a V-shaped cross section.

[0017]

As described above, according to the first aspect of the present invention, the line-shaped recesses 6 and 7 are formed on one side surface and the other side surface of the lid 3a so as to face each other, and these two recesses 6 are formed. Since the cutout line portion 5 is provided between the bottom surfaces of the 7 and the lid 3a is cut off from the can main body 2 through the cutout line portion 5, the cutout line portion 5 is sheared to the outer peripheral edge of the lid 3a. The generated burr can be prevented from protruding from the middle portion in the thickness direction of the lid 3a along the outer peripheral edge thereof to the tip of the tip protruding outward in the thickness direction of the lid 3b, and at the inner peripheral edge of the opening on the can body 2 side. Even if the burr is generated, it is possible to prevent the tip of the burr from protruding from the middle position in the thickness direction of the can body 2 along the inner peripheral edge thereof to the outside of the outer surface of the can body 2, and thus, for example, the lid 3b. When the hand is directly held by the hand, the hand will not get caught on the burr, and the can body 2 And like peripheral mouth of the formed opening is touched is also than that never could get caught in the burr like lips.

According to the second aspect of the invention, the lid 3a is provided.
The inner bottom surface of one of the recesses 6 formed in
By making the inner bottom surface of the other recess 7 a wide flat surface,
Even if the formation positions of these recesses 6 and 7 are slightly displaced,
Since the thickness of the cut-off line portion 5 does not change, the work of opening the upper lid 3a can always be performed smoothly. Further, the invention according to claim 3 includes a first blade body 8 provided on both sides of the lid 3a with a pressing surface 81 having a V-shaped cross section which is tapered toward the tip.
Press surface 91 which is a flat surface wider than the tip of the first blade body 8
The second blade body 9 provided with is arranged so as to face each other, and the pressing operation of both blade bodies 8 and 9 causes the recess 6 having the V-shaped cross section and the inner bottom surface to be wide on both side surfaces of the lid 3a. Since the recessed portion 7 which is a flat surface is press-formed to face each other so that the cut line portion 5 is formed between the recessed portions 6 and 7 of the lid 3a, the two blade bodies 8 and 9 are formed. During press molding, even if the installation position of the second blade body 9 with respect to the first blade body 8 or the installation position of the first blade body 8 with respect to the second blade body 9 is slightly deviated, the cut line portion 5 having a constant thickness is formed. It can be formed on the lid 3a.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a can body.

FIG. 2 is an explanatory view showing a state in which blades are arranged above and below a lid.

FIG. 3 is an enlarged cross-sectional view of a main part showing a part of a lid in which a recess is formed by cutting blades arranged above and below.

FIG. 4 is a sectional view of a main part of a can body showing a state in which a lid is opened.

FIG. 5 is a schematic perspective view of another embodiment of the can body.

FIG. 6 is a sectional view of a main part of a conventional lid.

FIG. 7 is a schematic cross-sectional view of a state in which the lid is pulled away from the can body side.

FIG. 8 is an enlarged view of a Z portion in FIG.

[Explanation of symbols]

 2 can main body 3a lid 5 cut line part 6.7 recess 8 first blade 81 press surface 9 second blade 91 press surface

Claims (3)

[Claims] 1. A lid (3) provided at an opening of a can body (2).
The cut line portion (5), which is thinner than the wall thickness (T) of the lid (3a), is provided in a), and the lid (3) for the can body (2) is provided.
In a can body in which at least a part of the lid (3a) can be separated from the can body (2) via the cut line portion (5) by a pulling operation of a), one side surface and the other side surface of the lid (3a) A can, characterized in that line-shaped recesses (6) and (7) are respectively formed in a confronting manner, and a cut line portion (5) is provided between the bottom surfaces of these recesses (6) and (7). The structure that separates the lid from the body. 2. The inner bottom surface (61) of one recess (6) formed in the lid (3a) has a V-shaped cross section, and the other recess (7).
The structure for separating the lid of the can body according to claim 1, wherein the inner bottom surface (71) of the container is a wide flat surface. 3. A lid (3) provided at an opening of a can body (2).
The cut line portion (5), which is thinner than the wall thickness (T) of the lid (3a), is provided in a), and the lid (3) for the can body (2) is provided.
a) A method of forming the cut line portion (5) in a can body, wherein at least a part of the lid (3a) can be separated from the can body (2) through the cut line portion (5) by a pulling operation of a). Of the first blade body (8), which is provided on both sides of the lid (3a) with a pressing surface (81) having a V-shaped cross section which is tapered toward the tip, Second blade body (9) having a press surface (91) which is a flat surface wider than the tip
And 2 are arranged so as to face each other, and by the pressing operation of these blades (8) and (9), the recess (6) having a V-shaped cross section and the inner bottom surface are widened on both side surfaces of the lid (3a). The flat concave portion (7) is press-molded to face each other so that the cut line portion (5) is formed between both concave portions (6) and (7) of the lid (3a). And a method of forming a line to be cut off of a lid in a can body.