Wide-mouth bottle-type can

Abstract

To provide a wide-mouthed bottle-type can capable of suppressing a solid matter from remaining on a neck part when a solid matter containing beverage is drunk.SOLUTION: A shoulder part 5 is formed in a tapered or domed shape in which a shoulder angle θ5 which is half a taper angle becomes a predetermined angle, or a cross-sectional convex circular arc shape which is convex toward the outside is formed and a shoulder angle θ5 between a chord of a convex circular arc and a center axis of a trunk part becomes a predetermined angle, a portion which has an inner diameter D8 of a curled part 8 smaller than an inner diameter D6 of a neck part 6 and continues from an upper end part of the neck part 6 to the curled part 8 is a contraction part 15 whose inner diameter gradually decreases upward, a difference between a diameter D2 of the trunk part 2 and the diameter D6 of the neck part 6 is larger than a difference between the diameter D6 of the neck part 6 and the inner diameter D8 of the curled part 8, and the shoulder angle θ5 is larger than an angle θ15 formed between a generatrix of the contraction part 15 and the center axis 14.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a wide-mouth bottle-shaped can having a relatively large opening diameter, which can be used for food and beverages including solids such as soups and fruit drinks as well as beverages.

Background Art

[0002] A steel-made wide-mouth screw-type can container is described in Patent Document 1. The screw-type can container includes a cylindrical container body having a joint portion, a neck portion with a reduced diameter at its open end, a screw thread and a bead portion formed on the neck portion, and a curled portion formed by curling the open end portion of the neck portion outward. The container mouth is sealed with a cap that is screwed onto the screw thread, forming a resealable container. The curled portion is formed so that its outer surface is smooth to ensure airtightness or liquid tightness by bringing a liner provided on the inner surface of the cap into close contact. For example, in an aluminum can, it is curled so that its cross-sectional shape is circular, and in a steel can, it is a so-called hashed curled portion that is three to four layers. The curled portion described in Patent Document 1 has a hashed configuration, and a similar curled portion is described in Patent Document 2.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The can container described in Patent Document 1 has a larger opening diameter compared to the container described in Patent Document 2, and can therefore be used not only as a beverage can but also as a container for solid beverages (liquid food and beverages) such as soups and fruit drinks. Solid matter in liquid food and beverages is not always evenly dispersed and often settles at the bottom. Therefore, when consuming, the can container is shaken to disperse the contents in the liquid, and then the container is tilted to pour out from the opening. When there is a certain amount of liquid remaining in the can container, the contents flow vigorously, allowing the solid matter to be drawn in and poured out of the can container. However, when drinking in small amounts or slowly, or when the amount remaining in the can container is small, the solid matter settles along the way and becomes difficult to remove from the can container. As described in Patent Documents 1 and 2, the can container has a shape in which the inner diameter gradually decreases from the body to the opening (curl part), so the settled solid matter gets caught in the so-called stepped part where the inner diameter changes, making it difficult to remove from the can container. When drinking, solid matter remaining inside a can is sometimes removed by forcibly shaking the can to move it to the opening or by scooping it out with a spoon. However, this is not only troublesome, but it is not always possible to remove all of the solid matter, which can result in discomfort or disappointment for the consumer.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a wide-mouthed bottle-type can suitable for liquid food and beverages containing solids, which allows solids to flow out easily and suppresses their residue. [Means for solving the problem]

[0006] To achieve the above objective, the wide-mouth bottle-type can of the present invention is a wide-mouth bottle-type can in which a shoulder portion is formed at the upper end of a steel body, the outer diameter of which gradually decreases upwards, a cylindrical neck portion is formed at the center of the upper end of the shoulder portion, and the upper end of the neck portion is an outwardly curled portion, the inner diameter of the curled portion is 30 mm or more, the shoulder portion is tapered in a way that the inner diameter gradually decreases towards the neck portion, or the shoulder portion is dome-shaped with a cross-sectional shape that is convex outwards when crossed with a plane along the central axis of the shoulder portion and the neck portion, and the inner diameter gradually decreases towards the neck portion, the inner diameter of the curled portion is smaller than the inner diameter of the neck portion, and the portion at the upper end of the neck portion that continues from the curled portion is a tapered constricted portion with an inner diameter that gradually decreases upwards. , the portion of the constricted portion adjacent to the curled portion The cross-section is formed as a curved surface that is convex toward the inside of the mouth and neck portion, the radius of curvature of the convex curved surface is 1 mm or more and 4 mm or less, the difference between the diameter of the body portion and the diameter of the mouth and neck portion is greater than the difference between the diameter of the mouth and neck portion and the inner diameter of the curl portion, and the angle between the inner surface of the tapered or dome-shaped shoulder portion and the central axis. The degree is defined as the shoulder angle, and the shoulder part angle The angle is half the taper angle in the case of a tapered shoulder, and in the case of a dome-shaped shoulder, it is the smaller of the angles formed by the intersection of the chord of the outwardly convex arc portion and the central axis when the shoulder is cut by a plane along the central axis, and the shoulder angle is front Note: The tapered portion in the part The angle between the generatrix and the aforementioned central axis The smaller of the degrees. It is larger, and the curled portion is further characterized by being formed by a three- or four-layered folded seam.

[0007] In the wide-mouth bottle-type can of the present invention, the shoulder angle may be 40° or more and 50° or less.

[0008] Furthermore, the wide-mouth bottle type of the present invention The cans may be filled with beverages containing solid particles. [Effects of the Invention]

[0010] The wide-mouth bottle-type can according to the present invention is suitable for liquid food and beverages containing solid matter that tends to settle, as the inner diameter of the curled portion, i.e., the opening diameter of the mouth, is 30 mm or more. The shoulder portion is the area between the neck portion, where the opening end is the curled portion, and the body portion, and the diameter is smaller on the neck portion side. The difference between the diameter of the lower body portion and the diameter of the upper neck portion is greater than the difference between the diameter of the neck portion and the diameter of the curled portion above the constricted portion. Therefore, the stepped portion where solid matter tends to get caught is located away from the curled portion, which is the spout. In particular, in the present invention, the shoulder portion is at a so-called reclining angle with respect to the central axis, while the constricted portion at the upper end of the neck portion leading to the curled portion is at a so-called upright angle with respect to the central axis. Therefore, solid matter is less likely to get caught in the constricted portion near the spout. Consequently, in the wide-mouth bottle-type can of the present invention, when the contents are consumed, solid matter that has overcome the so-called step in the area corresponding to the shoulder portion is poured out without getting caught in the constricted portion. Therefore, even if solid matter does remain inside, it will be located far from the spout (the curled part) and hidden by a large step, making it difficult for consumers to visually detect any remaining solid matter. This also makes it easier for consumers to accept that some residue is unavoidable, thus mitigating any discomfort or disappointment.

[0011] Furthermore, in this invention, even if a load associated with the capping pressure is applied to the shoulder when attaching the cap by so-called roll-on capping, the shoulder angle is 40° or more and 50° or less, which reduces the component force that causes buckling at or near the shoulder, thus making it possible to avoid or suppress buckling while maintaining the aforementioned step.

[0012] Furthermore, by having a curved surface with a radius of curvature of 1 mm to 4 mm in the constricted portion, when the can is tilted to drink a beverage containing solids, the solids at the neck of the opening will not remain but will flow more easily towards the curled portion.

[0013] Furthermore, in this invention, by employing a seam-fold structure in the curled portion, rusting of the cut edge portion that is rolled inside can be prevented. In addition, the curled portion is independent of the constricted portion below it and does not become a limiting factor in the shape of the constricted portion, so the constricted portion can be configured as described above to improve the fluidity of solids or to make it easier for solids to flow out. Moreover, because the entire product is made of steel, even if a seam-fold structure is adopted in the curled portion, the high rigidity of the steel material prevents deformation or damage to the curled portion due to the load caused by the cap-clamping pressure when attaching the cap. Consequently, the unraveling of the curled portion and the resulting shift downward on the shaft can prevent a decrease in the airtightness and ease of opening of the cap. [Brief explanation of the drawing]

[0014] [Figure 1] This is a front view showing an example of a wide-mouth bottle-type can according to the present invention. [Figure 2] This is a cross-sectional view of the wide-mouth bottle-type can according to the present invention, excluding the cap. [Figure 3] This is an enlarged explanatory diagram of area III in Figure 2. [Figure 4] This is an enlarged explanatory diagram of the curled portion of the wide-mouth bottle-type can according to the present invention. [Figure 5] This is a diagram illustrating the effects and advantages of the wide-mouth bottle-type can in the present invention. [Figure 6] This is a cross-sectional view showing a part of a bottle-shaped can with a rounded curled section, which is an example of the conventional technology. [Modes for carrying out the invention]

[0015] An example of a wide-mouth bottle-type can of the present invention will be described below based on the drawings. Note that the embodiments described below are merely examples of how the present invention may be implemented and do not limit the invention.

[0016] As shown in FIGS. 1 and 2, the bottle-shaped can 1 of the present embodiment is a so-called three-piece can in which one opening of the body portion 2 is closed by a cap 3 and the other opening is closed by a bottom lid 4. In the present invention, it is not limited thereto, and a so-called two-piece can in which the body portion 2 and the bottom lid 4 are integrally formed may be used. In the case of a three-piece can, a thin steel plate is formed into a cylindrical shape, and the ends thereof are overlapped and joined by welding or the like. One end of the obtained cylindrical body is subjected to necking to gradually reduce the outer diameter, and a separate bottom lid 4 is wound and fixed to the opened end subjected to the necking.

[0017] A shoulder portion 5 and a mouth-neck portion 6 are integrally provided following the upper side of the body portion 2. The shoulder portion 5 is a portion formed by drawing so that the diameter gradually decreases upward on the opening end side opposite to the opening end to which the bottom lid 4 is attached, and has a substantially tapered shape or a dome shape with a convex arc-shaped cross section that bulges slightly outward. The mouth-neck portion 6 is a cylindrical portion with a small inner diameter formed continuously at the center of the tip of the shoulder portion 5, and the tip portion thereof is opened so as to be a so-called drinking mouth or extraction port. The mouth portion 7 serving as the drinking mouth or extraction port is sealed by attaching a cap 3 to the mouth-neck portion 6. The end portion of the mouth portion 7 is a curled portion 8 bent outward so that a sharp edge is not exposed. The inner diameter of the curled portion 8 (curl portion inner diameter D8) is 30 mm or more, which is a wide-mouth can. Further, the curled portion 8 may be a portion (creased portion) formed by bending back twice or three times outward to form three or four layers. A screw molding is performed at a position slightly below the curled portion 8 in the mouth-neck portion 6 to form a male screw portion 9.

[0018] The cap 3 shown in Fig. 1 is a metal pill-far-proof cap having a resin liner (not shown), and is attached to the mouth-neck portion 6 by a conventionally known roll-on capping method. That is, a cylindrical cap rough material having a top plate portion is placed over the mouth-neck portion 6, and while applying a plugging pressure from above to the rough material, the skirt portion of the rough material is pressed against the male screw portion 9 described above by a screw forming roll to process the cap screw groove 10. Further, a pill-far-proof band 11 is provided at the lower end portion of the cap 3, that is, below the cap screw groove 10, and an annular convex bead portion 12 for engaging to prevent the pill-far-proof band 11 from coming off is formed so as to connect to the lower side of the male screw portion 9. By forming the convex bead portion 12, a relatively recessed (constricted) portion is the concave groove portion 13, and the concave groove portion 13 is located at the boundary portion between the mouth-neck portion 6 and the shoulder portion 5.

[0019] Figs. 3 and 4 are partial cross-sectional views showing the shoulder portion 5 and the mouth-neck portion 6. Fig. 3 is an enlarged view of the region III in Fig. 2, and Fig. 4 is a further enlarged cross-sectional view near the curl portion 8. As shown in these figures, the shoulder portion 5 is a portion having a so-called climbing gradient in cross-sectional shape, and the shoulder angle θ5 is 40° or more and 50° or less, preferably 45°. Here, when the shoulder portion 5 is formed in a tapered shape, the shoulder angle θ5 is half of the taper angle. When the shoulder portion 5 is formed in a so-called dome shape, the angle formed by the convex arc in the longitudinal cross-section and the central axis 14 of the body portion 2 is as follows. degrees (angle at the apex of a cone) Half of the angle. When the shoulder portion 5 is formed in a so-called dome shape, the convex arc in the longitudinal cross-section The string (the string on the inner side of shoulder part 5) and The angle formed with the central axis 14 of the body portion 2 In degrees (half the angle of the apex of the tapered shape formed by the aforementioned chord) There is.

[0020] On the other hand, the mouth-neck portion 6 is subjected to roll forming, and from the concave groove portion 13 on the upper end side of the shoulder portion 5 upward, there are a convex bead portion 12, a male screw portion 9, a constriction portion 15 formed between the male screw portion 9 and the curl portion 8, and the curl portion 8.

[0021] From the upper end of the male screw portion 9 to the recessed groove portion 13, the average inner diameter of the mouth and neck portion D6 is obtained by averaging the peaks and valleys of the inner diameter of each portion. The inner diameter of the curled portion D8 is smaller than the average inner diameter of the mouth and neck portion D6, and the average inner diameter of the mouth and neck portion D6 is smaller than the inner diameter of the body portion 2 (body inner diameter D2). The difference between the body inner diameter D2 and the average inner diameter of the mouth and neck portion D6 is halved to obtain the shoulder step G1 shown in Figure 3, and the difference between the average inner diameter of the mouth and neck portion D6 and the inner diameter of the curled portion D8 is halved again to obtain the constriction step G2 shown in Figure 3, and the shoulder step G1 is larger than the constriction step G2.

[0022] The diaphragm section 15 is a portion formed continuously at the upper end of the mouth neck 6, from the male screw portion 9 to the curled portion 8, with the inner diameter gradually decreasing upwards. In the diaphragm section 15, a curved surface is formed that is convex toward the inside of the mouth neck 6 in the portion adjacent to the curled portion 8, and the radius of curvature of this convex curved surface is between 1 mm and 4 mm. The portion between the diaphragm section 15 and the male screw portion 9 is a continuously formed smooth curved surface, which is concave toward the inside of the mouth neck 6. Therefore, the diaphragm section 15 is a so-called upward sloping portion, and its diaphragm section angle θ15 is smaller than the shoulder section angle θ5 mentioned above (θ15 < θ5). Here, the diaphragm section angle θ15 is the angle between the inclined generatrix of the diaphragm section 15 and the central axis 14.

[0023] Next, the operation of the wide-mouth bottle-type can 1 according to the present invention will be explained. Figure 5 schematically shows a state in which a drinker 16 is drinking a beverage containing solid matter (liquid food or drink) filled in the bottle-type can 1. The bottle-type can 1 is filled with a liquid beverage 18 containing solid matter 17, and when the drinker 16 tilts the bottle-type can 1 to drink, the liquid beverage 18 and solid matter 17 are poured together into the drinker 16's mouth. Since the liquid surface of the liquid beverage 18 is always horizontal, the more the drinker 16 tilts the bottle-type can 1 horizontally, the larger the amount of liquid beverage 18 that is poured out.

[0024] On the other hand, when the bottle-type can 1 is upright and stationary, the solid matter 17 settles or floats in the liquid beverage 18 and at or near the bottom of the body 2. When the drinker 16 tilts the bottle-type can 1 to drink, the solid matter 17 that was settled or floating in the body 2 of the bottle-type can 1 passes through the shoulder 5 and the neck 6 and enters the drinker's mouth. When the solid matter 17 moves from the body 2 of the bottle-type can 1 through the shoulder 5 to the neck 6, the solid matter 17 needs to overcome the shoulder step G1. Also, when the solid matter 17 moves from the neck 6 of the bottle-type can 1 through the curled section 8 to enter the drinker's mouth, the solid matter 17 needs to overcome the constricted section step G2. In the wide-mouth bottle-type can 1 according to the present invention, the shoulder step G1 is larger than the constricted step G2, and the shoulder angle θ5 is larger than the constricted angle θ15. Therefore, when the bottle-type can 1 is tilted and the contents flow out, solid matter 17 can more easily overcome the constricted step G2, which has a smaller step than the shoulder step G1. In other words, when solid matter 17 overcomes the shoulder step G1 and moves to the constricted step G2, it is easier for it to move into the mouth of the drinker 16 from the constricted step G2, which has a smaller step than the shoulder step G1. This suppresses the residue of solid matter 17 at the mouth neck 6, or at least at the part close to the mouth 7.

[0025] Furthermore, the constricted portion 15 provided between the curled portion 8 and the male screw portion 9 has a curved surface with a radius of curvature of 1 mm to 4 mm and a curved surface that is concave relative to the inside of the mouth and neck portion 6. This prevents or suppresses the solid matter 17 in the mouth and neck portion 6 from getting caught and remaining when the bottle-type can 1 is tilted to drink a beverage containing solid matter, and makes it easier for the liquid to flow towards the curled portion 8. Therefore, with the wide-mouth bottle-type can 1 of the present invention, when the liquid beverage 18 containing the solid matter 17 or only the solid matter 17 is removed from the bottle-type can 1, the solid matter 17 is less likely to remain.

[0026] Furthermore, by setting the shoulder angle θ5 to 40° or more and 50° or less, deformation of the shoulder 5 can be suppressed even if the axial load of the cap-clamping pressure generated when attaching the cap 3 to the bottle-type can 1 is applied to the shoulder 5. Therefore, the possibility of the bottle-type can 1 collapsing due to insufficient buckling strength can be reduced as much as possible. In addition, by making the bottle-type can 1 out of steel and folding the curled portion 8 outwards two or three times to create a three- or four-layer seam, the cut edges that are directly exposed as steel material can be rolled inward, preventing rust formation. Furthermore, even if a seam-folded structure is adopted for the curled portion 8, the rigidity of the curled portion 8 can be ensured because it is made of steel. Therefore, deformation or damage to the curled portion 8 due to the axial load of the cap-clamping pressure generated when attaching the cap 3 can be suppressed, and the deterioration of the cap's airtightness and ease of opening due to the curled portion 8 unraveling and shifting downward on the axis can be suppressed.

[0027] Here, the effects of having the curled portion 8 folded at the seam will be further explained by comparing the wide-mouth bottle-type can of the present invention with an example of a conventional bottle-type can. Figure 6 is a cross-sectional view showing the upper part of the body of a conventional aluminum alloy bottle-type can 20, where the curled portion is a round curled portion 21. The round curled portion 21 is formed by curling the opening edge of the intermediate material outwards so that it is hollow with a circular or elliptical cross-section, and a part of the round curled portion 21 and a part of the constricted portion 23 between the male screw portion 22 and the round curled portion 21 are integrated. That is, the round curled portion 21 is formed by bringing the tip of the curled portion into close contact with the surface of the constricted portion 23. Therefore, the constricted portion 23 is tilted to be closer to horizontal than the constricted portion 15 of the wide-mouth bottle-type can of the present invention. In other words, the step G23 and angle θ23 of the constricted portion 23 in the conventional method are inevitably larger than the step G2 and angle θ15 of the constricted portion in the wide-mouth bottle-type can 1 of the present invention. Therefore, when a drinker 16 tilts the bottle-type can 20 to drink a beverage containing solid matter, even if the solid matter 17 moves to the neck portion 24, the solid matter 17 tends to get caught and remain in the area from the constricted portion 23 to the rounded curl portion 21.

[0028] On the other hand, in the wide-mouthed bottle-type can 1 of the present invention, the folded seam curl portion 8 and the constricted portion 15 are independently established, so the constricted portion angle θ15 of the constricted portion 15 does not affect the curl portion 8 and can be set freely. Therefore, the constricted portion step G2 and the constricted portion angle θ15 can be set small to prevent solid matter 17 from remaining in the neck portion 6. As a result, when drinking a beverage containing solid matter by tilting the bottle-type can 1, the solid matter 17 moves to the neck portion 6 and over the curl portion 8, and the pre-set low constricted portion step G2 and constricted portion angle θ15 make it easier for the solid matter 17 to move over the curl portion 8, thus making it easier for the solid matter 17 to move into the mouth of the drinker 16, thus suppressing the retention of solid matter 17 in the neck portion 6.

[0029] Furthermore, the wide-mouth bottle-type can of the present invention is not limited to the embodiments described above, nor is it limited to beverages containing solids. For example, it may be filled only with liquid beverage 18, and even if a highly viscous liquid beverage (not shown) is filled, it is less likely to remain in the neck 6, thus suppressing residue. [Explanation of Symbols]

[0030] 1 Wide-mouth bottle-type can 2 Torso 3 caps 4 Bottom lid 5 Shoulder 6 Mouth and neck 7 Mouth 8. Curl section 9 Male threaded section 10 cap screw grooves 11 Pillfer Proof Band 12. Convex bead section 13 Concave groove part 14 Center axis 15 Aperture section 16 Drinker 17. Solids 18 Liquid beverages θ15 Aperture angle θ5 Shoulder angle D2 Inner diameter of the body D6 Average inner diameter of mouth and neck D8 Inner diameter of curled section G1 Shoulder step G2 Aperture section step

Claims

1. A wide-mouthed bottle-type can is formed in which a shoulder portion is formed at the upper end of a steel body, with the outer diameter gradually decreasing upwards, a cylindrical neck portion is formed at the center of the upper end of the shoulder portion, and the upper end of the neck portion is an outwardly curled portion. The inner diameter of the aforementioned curled portion is 30 mm or more. The shoulder portion is formed in a tapered shape, where the inner diameter gradually decreases towards the neck portion, or in a dome shape, where the cross-sectional shape when crossed with a plane along the central axis of the shoulder portion and the neck portion is a convex arc shape that is convex outward, and the inner diameter gradually decreases towards the neck portion. The inner diameter of the curled portion is smaller than the inner diameter of the neck portion, and the portion continuing from the curled portion at the upper end of the neck portion has a tapered shape where the inner diameter gradually decreases towards the top. The portion of the constricted portion adjacent to the curled portion is formed as a curved surface that is convex toward the inside of the mouth neck in the cross-section, and the radius of curvature of the convex curved surface is 1 mm or more and 4 mm or less. The difference between the diameter of the body and the diameter of the neck is greater than the difference between the diameter of the neck and the inner diameter of the curled portion, The angle between the inner surface of the tapered or dome-shaped shoulder portion and the central axis is defined as the shoulder angle, and the shoulder angle is half the taper angle for a tapered shoulder portion, and for a dome-shaped shoulder portion, it is the smaller of the angles formed by the intersection of the chord of the outwardly convex arc portion and the central axis when the shoulder portion is cut by a plane along the central axis. The shoulder angle is greater than the smaller of the angles between the generatrix of the tapered portion in the constricted section and the central axis, and further The aforementioned curled portion is formed by a folded portion consisting of three or four layers. A wide-mouthed bottle-type can characterized by its features.

2. A wide-mouth bottle-type can according to claim 1, The shoulder angle is 40° or more and 50° or less. A wide-mouthed bottle-type can characterized by its features.

3. A wide-mouth bottle-type can according to claim 1 or 2, It is filled with beverages containing solids. A wide-mouthed bottle-type can characterized by its features.

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