JPH05178345A - Easily openable can lid - Google Patents

Abstract

PURPOSE:To prevent the contained beverage from being blown out from the can lid opening even then the can is slightly tilted by a method wherein a missing part, which is confronted with a part being closer to the lid main body center of a main score part, is formed, and a score part for vent, which has a wave shape, is formed along the rivet part of the lid main body. CONSTITUTION:On a lid main body 1 of a can lid 10, a main score part 2 which defines an opening to become a drinking port and a rivet 4 are formed, and a pinching tab 3 with a ring part 3a is fixed to the rivet 4. The main score part 2 is formed into a tear drop shape, and a part which is closer to the center of the lid main body 1, i.e., a part which is confronted with a head end 2a, is made to be a missing part 5. Also, both final ends 2b of the main score part 2, i.e., both side parts of the missing part 5, are formed to be curved outward. In addition, a wave-shaped score part for vent 6, of which the central part 6a along the rivet 4 part on the missing part 5 side of the lid main body 1 is semicircular, and of which both end parts 6b are comparatively closer to the main score part 2, is formed, and gap parts 3d are formed between respective ends of the score part 6 and the main score part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called eco-friendly easy-to-open can lid in which the tab and the tearing tongue do not separate from the lid body after the score is torn and opened by the tab.

[0002]

2. Description of the Related Art As a can lid which is easy to open and has a tab and a tearing tongue that are difficult to separate from a lid body after opening, FIG.
A can lid 100 of the type shown in FIG.
-69451). In the figure, 101 is a lid body,
102 is a score-like portion that defines the opening. The score section 102 has two ends 102a,
The portion between them is the missing portion 105. Reference numeral 103 denotes a ring-shaped knob tab, which is fixed to the rivet 104 of the lid body 101 via the tongue-shaped portion 103a. The head end 102b of the score portion is relatively close to the peripheral rising portion (so-called chuck wall) 101a of the lid body, and the nose portion 103b of the knob tab 103 is the head end 10 of the score portion.
It extends beyond 2b toward the chuck wall 101a.

At the time of opening, when a finger is inserted into the knob tab 103 and a portion on the left side of the rivet 104 in the drawing is pushed up, the nose portion 103b pushes down a portion of the lid main body immediately thereunder, and at the same time, the rivet 104 is pulled up. Therefore, a shearing force acts on the head end 102b of the score portion, and the head end 102a and the vicinity thereof are broken to perform the initial opening. Subsequently, when the knob tab 103 is pulled up toward the left side of the drawing, the score portion 102 is torn, and a tearing tongue piece (not shown) is formed. Both ends 1 of the score part 102
Since there is the missing portion 105 between 02a, the tearing tongue piece is connected to the lid body 101 via the missing portion 105 even after the opening is completed, that is, the tearing tongue piece does not separate from the lid body 101.

The can lid 100 having an easy opening as described above has the following problems. A positive pressure beverage such as a cola beverage is filled leaving a headspace (see 13 in FIG. 3),
Trying to open a can of beverage sealed in the can lid 100,
When the thumb is inserted into the pick tab 103 and the pick tab 103 is pushed up, the can tilts so that the head end 102b of the score portion faces downward, but the head end 102a is at the chuck wall 10.
Since it is relatively close to 1a, even if it is slightly inclined,
The beverage contacts the lower surface of 02b. Therefore, the beverage to which the internal pressure is applied is likely to be ejected from the initial opening portion, which easily causes troubles such as soiling the clothes. For example, if a can lid with a nominal diameter of 206 (compatible body opening end inner diameter 57.0 mm) and a neck-in can body with a nominal diameter of 211 (body diameter 65.8 mm) are sealed (headspace height about 10 mm), The above spouting occurs at a tilt of 10 degrees.

The rising portion 103c connecting the tongue portion 103a and the nose portion 103b of the knob tab 103 has a narrow width,
The upper end 103c1 and the lower end 103c2 are bent to be bent. When the knob tab 103 is pushed up due to the opening and further pulled up, the lower end 103c2 is subjected to reverse bending and at the same time a relatively strong tension is applied. Therefore, when the knob tab 103 is made of a relatively hard and brittle aluminum alloy plate, 103c2 easily breaks. Therefore, the tab tab 103 may be separated from the tearing tongue during the tearing of the score portion 102, and the complete opening may not be performed, or the tab tab 103 may be detached from the lid main body 101 to cause a problem of damaging the environment. ..

[0006]

DISCLOSURE OF THE INVENTION The present invention, when used as a can lid for a can of canned food filled with positive internal pressure beverage, has a thumb when the thumb is inserted into the tab and opened, even if the can is slightly tilted. It is an object of the present invention to provide a can lid with an easy opening in which there is no fear that the squirt will spout, and in which the pick tab and the tearing tongue will not come off from the lid body.

[0007]

The easily openable can lid of the present invention has a main score portion that defines an opening to be a drinking mouth or the like in an easily openable can lid in which a pick tab is fixed to a rivet of a lid body. Is a teardrop shape or a keyhole shape in which the portion facing the initial opening portion just below the nose portion of the tab is a missing portion,
The initial opening is relatively close to the edge of the lid body, and the score portion for vent is formed along at least the rivet portion on the side of the missing portion of the lid body. It is characterized in that a gap is formed between the main score portions. It is preferable that a bead portion or a score portion that is separated from the main score portion and that extends in a direction connecting both ends of the main score portion is formed at or near the missing portion.

[0008]

Describing in accordance with the embodiment shown in FIG. 1, the tearing tongue piece 8 (see FIG. 3) formed after opening is connected to the lid main body 1 at the notch 5 and at the gap 3d. It is joined with. Missing part 5 and gap 3
Although d is bent after opening, since it is originally flat, it is not subjected to reverse bending. Therefore, even if the lid body 1 is made of an aluminum alloy plate, it will not break if its width is appropriately determined. Absent. Therefore, in the normal use state, the tab 3 and the tearing tongue piece 8 are not separated from the lid body 1.

When the knob tab 3 is pushed up, first, the vent score part 6 is broken starting from the central portion 6a, and then the head end 2a of the main score part is broken by the nose portion 3b of the knob tab. .. A considerable distance between the central part 6a and the head end 2a (usually about 7 to 10 m)
m). Therefore, when it is used as a can lid of a canned food filled with a positive pressure drink, even when the can is slightly tilted and the surface of the content drink is below the head end 2a when the thumb is inserted into the tab and the opening occurs, When not under the central portion 6a, the pressurized gas in the head space 13 is instantaneously blown out from the fractured central portion 6a, and the internal pressure of the can becomes substantially zero. Therefore, there is no possibility that the content beverage 12 will spout from the head end 2a, that is, the initial opening portion of the main score portion 2.

By providing the bead portion 7 or the score portion in the missing portion 5, the tearing tongue 8 at the end of opening can be easily bent in the direction away from the opening 9.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, 10 is a can lid that can be easily opened, and 1 is a lid body formed of an aluminum alloy thin plate or a surface-treated steel plate such as tin-plated steel plate or tin-free steel. .. The lid main body 1 has a main score portion 2 and a rivet 4 which define an opening portion such as a spout or a spout.
And the tab 3 is fixed to the rivet 4. The knob tab 3 has a ring portion 3a into which a finger can be inserted at the time of opening, and the nose portion 3b is directly above the head end 2a of the main score portion 2 or slightly inside the head end 2a. It is located right above the (rivet 4 side) part. This is to facilitate the initial breakage of the main score portion 2.

The substantially semicircular peripheral portions 3c on both sides of the nose portion 3b of the knob tab 3 are also directly above the substantially semicircular peripheral portions 2c on both sides of the head end 2a of the main score portion 2 or from the above portion. Is located just above the inner side (rivet 4 side). By doing so, the fingers are less likely to be injured by the sharp end surface of the portion corresponding to the peripheral edge portion 2c of the tearing tongue during or after opening.

The main score portion 2 has a teardrop shape, and a portion near the center of the lid body 1, that is, a portion facing the head end 2a is a missing portion 5. Head end 2a of the main score part 2 so that it is easy to drink and pour out the contents beverage
Are relatively close to the chuck wall 1a of the lid body 1. Both end portions 2b of the main score portion 2, that is, the missing portion 5
The parts on both sides of are curved outward. Because of the opening
This is to ensure that the tearing stops at the end 2b when tearing the main score portion 2. A bead 7 is provided between both ends 2b. This is because after the opening is completed, the tearing tongue piece 8 (FIG. 3) can be easily bent at the missing portion 5.
Instead of the beads 7, a shallow score portion (not shown) may be provided.

The central portion 6a along the rivet 4 portion on the side of the missing portion 5 of the lid body 1 is semicircular, and both end portions 6b are the main score portion 2.
The corrugated score portion 6 for the vent is formed relatively close to the. When the lid body 1 is made of an aluminum alloy plate, the width w of the gap 3d between the end 6b and the main score portion 2
It is desirable that (in the direction perpendicular to the straight line connecting the centers of the rivet 4 and the lid body 1) be about 1.5 to 5.0 mm. This is because if it is less than about 1.5 mm, the gap 3d is easily broken during bending described later, and if it is more than about 5.0 mm, the gap 3d becomes difficult to bend.

Canned goods 11 sealed with a can lid 10 that is easy to open
When opening (Fig. 3), pick your thumb and ring part 3 of the tab.
When the body part 11a is inserted, the nose part 3b of the tab is slightly tilted downward, and the ring part 3a is pushed up, the part of the rivet 4 on the missing part 5 side first rises, and the score part for the vent is formed. A shearing force acts on the central portion 6a of 6 to break the score portion 6 for a vent starting from the central portion 6a, and then the nose portion 3b of the tab 3 pushes down the head end 2a of the main score portion to push the head end 2a. And the vicinity thereof is broken, and the initial opening is performed. Then, when the ring portion 3a is pulled up toward the cutout portion 5, the main score portion 2 is torn, the tear reaches the end portion 2b, and the opening ends.

FIG. 3 shows an example of a state in which the body portion 11a is made vertical after the opening is completed. 8 is a tearing tongue piece, 9 is an opening. The tearing tongue piece 8 is
It is connected to the lid body 1 in a state of being bent near 0 °, and is similarly connected to the knob tab 3 in a state of being bent near 180 ° in the gap 3d. That is, after opening, tearing tongue 8
And the tab 3 does not come off from the lid body 1.
Since the tearing tongue piece 8 is bent in a Z shape and is located outside the opening portion 9, the lips touch the end surface of the tearing tongue piece 8 even when the content drink 12 is directly drink from the opening portion 9 and are damaged. There is no fear.

When the knob tab 3 is pushed up for opening, as described above, the central portion 6a of the vent score portion 6 is broken before the head end 2a of the main score portion 2. The central portion 6a and the head end 2a are separated from each other, and the center 6a of the central portion 6a
The distance between 1 and the head end 2a is usually about 10 mm. Therefore, the inclination of the body portion 11a is such that the surface of the content drink 12 is the head end 2a.
However, if it is not below the central portion 6a, the high-pressure gas in the head space 13 is instantaneously blown out from the broken central portion 6a, and the internal pressure rapidly becomes substantially zero. The content beverage 12 does not spout from the broken head end 2a. That is, in the case where the structure is the same as that of the canned food and the can lid described in Paragraph No. 0004, the content beverage 12 does not spout from the broken head end 2a even if it is tilted by about 20 degrees.

The present invention is not limited to the above embodiment, and may be an easily opened can lid 20 having a keyhole-shaped main score portion 22 as shown in FIG. 4, for example. .. In FIG. 4, the same reference numerals as those in FIG. 1 denote the same parts.

[0019]

INDUSTRIAL APPLICABILITY The can lid of the present invention, which is easy to open, is used as a can lid of a can filled with a positive pressure beverage, even if the can is slightly tilted when the thumb is inserted into the tab and opened. There is no risk of the content beverage spouting, and in addition, in a normal use state, the tab and the tearing tongue do not come off from the lid body.

[Brief description of drawings]

FIG. 1 is a plan view of a can lid that is an easy-to-open according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II of FIG.

FIG. 3 is a longitudinal cross-sectional view of essential parts showing an example of a state after opening the can of food which is sealed by the easily opened can lid of FIG.

FIG. 4 is a plan view of a can lid which is a second embodiment of the present invention and whose opening is easy.

FIG. 5 is a plan view of an example of a conventional can lid whose opening is easy.

6 is a vertical sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

 1 Lid main body 1a Chuck wall (edge) 2 Main score part 2a Head end (initial opening part) 2b End 3 Pick tab 3b Nose part 3d Gap part 4 Rivet 5 Missing part 6 Vent score part 6b End part 7 Bead 8 Tear Tongue piece 9 Opening portion 10 Can lid that can be easily opened 20 Can lid that can be easily opened 22 Main score part

Claims (2)

[Claims] 1. In an easily opened can lid in which a knob tab is fixed to a rivet of a lid main body, a main score portion that defines an opening for a drinking mouth or the like has an initial opening portion directly below a nose portion of the knob tab. Has a teardrop shape or a keyhole shape in which the portion facing to is a cutout portion, and the initial opening portion is relatively close to the edge of the lid body, and at least along the rivet portion on the cutout portion side of the lid body. An easily opened can lid characterized in that a score part for a vent is formed, and a gap is formed between each end of the score part for a vent and the main score part. 2. A can lid which is easy to open according to claim 1, wherein a bead portion or a score portion which is separated from the main score portion and which extends in a direction connecting both ends of the main score portion is formed at or near the missing portion. ..