JP7039966B2 - Metal container body and metal container products - Google Patents

Description

The present invention is a metal container body of a metal container product in which the contents are sealed by joining a lid material to the flange portion of the metal container body, and the lid material is peeled off from the flange portion to open the container, and a metal container body. Regarding container products.

Conventionally, as a container for storing food etc. in a sealed manner, the contents are sealed by heat-bonding (for example, heat-sealing) the lid material to the flange of the container body, and when the container is opened, the lid material is flanged. An easy-to-open container (a container with an easy peel type lid) that can be peeled off from the portion and opened is widely used (see, for example, Patent Document 1).

In this type of easy-to-open container, as shown in FIG. 6, the internal pressure inside the easy-to-open container 110 is increased by the heat-bonding portion 160 in which a lid material (not shown) is heat-bonded to the flange portion 140 of the container body 120. As a result, the pressure resistance of the easy-to-open container 110 that resists the peeling of the heat-bonded portion 160 is ensured.

Jikkenhei 3-60276 Gazette

However, since the heat-bonded portion 160 is formed by melting a thermoplastic resin such as PP (polypropylene) on the upper surface (inner surface) of the flange portion 140, the outer peripheral edge 161 of the heat-bonded portion 160 is liable to be disturbed. As a result, it is difficult to form the radial widths W1 to W3 of the thermal junction 160 to be constant.

Therefore, in order to secure the desired pressure resistance, the radial width dimension of the thermal junction 160 must be designed to be extra large in consideration of the disturbance of the outer peripheral edge 161 of the thermal junction 160 described above. As a result, in addition to the flange portion 140 becoming larger in the radial direction, there is a problem that the easy-opening property of the easy-opening container 110 that makes it easy to peel off the lid material from the container main body 120 is lowered.

Further, in the case of the easily openable container 110 disclosed in Patent Document 1, the tip curled portion 143 formed on the outer peripheral edge of the flange portion 140 is larger than the bonded portion 141 to which the lid material of the flange portion 140 is heat-bonded. Since it is lowered downward, it is conceivable to use the boundary portion between the bonded portion 141 and the tip curled portion 143 as a portion for defining the outer edge of the thermal bonding portion 160. However, when the container body 120 is formed of a metal such as aluminum, the tip curl portion 143 is formed by rounding the outer edge portion of the flange portion 140, so that it is difficult to form the tip curl portion 143 with high accuracy, and the cover is covered. It is difficult to use the boundary portion between the joint portion 141 and the tip curl portion 143 as a portion that defines the outer edge of the thermal joint portion 160.

Therefore, the present invention solves these problems, and is a metal container main body that realizes miniaturization of a flange portion and improvement of easy-opening property while ensuring a desired pressure resistance with a simple configuration. And is intended to provide metal container products.

In the present invention, the lid material is detachably joined to the flange portion of the metal container body by thermal bonding, crimping or bonding, and the joint portion between the flange portion and the lid material is peeled off and opened . The metal container body of the product, the metal container body includes a cup portion and the flange portion extending from the open end edge of the cup portion to the outer peripheral side, and the flange portion has the lid material thereof . A tapered portion formed adjacent to the outer periphery of the bonded portion and inclined outward and downward with respect to the bonded portion, which is bonded by thermal bonding, crimping, or bonding over the entire upper surface. The problem is solved by having the tip curl portion formed on the outer peripheral edge of the flange portion.

According to the inventions according to claims 1 and 3, the flange portion of the metal container body has a bonded portion to which the lid material is detachably joined and a tip curl portion formed on the outer peripheral edge of the flange portion. A tapered portion is formed on the outer periphery of the bonded portion so as to be inclined outward and downward with respect to the bonded portion.
This makes it possible to make the boundary between the jointed portion and the tapered portion function as a portion that determines the outer peripheral edge of the joint portion between the flange portion and the lid material, and the outer peripheral edge of the joint portion is disturbed. Can be avoided. As a result, it is not necessary to design the radial width dimension of the joint portion to be extra large in consideration of the disturbance of the outer peripheral edge of the joint portion, so that the radial width of the joint portion is ensured while ensuring the desired pressure resistance. The dimensions can be designed to be small, and the flange portion can be miniaturized and the ease of opening can be improved.
Further, when joining the flange portion and the lid material, a so-called spot coat in which a thermoplastic resin is locally applied to the upper surface of the bonded portion of the flange portion may be applied before the joining. However, since the boundary portion between the bonded portion and the tapered portion can function as a portion that determines the outer peripheral edge of the spot coat, it is possible to reliably avoid the occurrence of disturbance on the outer peripheral edge of the bonded portion.
Further, by forming a tapered portion that is inclined outward and downward with respect to the bonded portion between the bonded portion and the tip curled portion, the bonded portion can be formed regardless of the size and shape of the tip curled portion. Since it is possible to surely create a gap between the flange portion and the lid material on the outer peripheral side, the fingers can be easily inserted into the gap, and the ease of opening can be improved.
In addition, since a tapered portion that is inclined outward and downward with respect to the bonded portion is formed between the bonded portion and the tip curled portion, a large-scale equipment is required compared to roll processing and the like. The tip curled portion can be easily formed by processing with a punch and a die. That is, during the molding process of the metal container body, by forming a tapered portion and inclining the inner peripheral side portion of the tip curl portion when processing the tip curl portion or before processing the tip curl portion. By processing with a punch and a die, the vicinity of the outer peripheral edge of the flange portion can be easily rounded, and the tip curled portion can be easily formed.

According to the invention according to the second aspect of the present invention, the bonded portion and the tapered portion are each formed so as to extend linearly when viewed in cross section, so that the bonded portion of the metal container body is covered with a lid material. Not only can the joint be easily joined, but the boundary between the joined portion and the tapered portion, which functions as a portion that defines the outer peripheral edge of the joint portion between the flange portion and the lid material, can be made clearer. Therefore, it is possible to reliably avoid the occurrence of disturbance on the outer peripheral edge of the joint portion.

Explanatory drawing which shows the metal container product which concerns on one Embodiment of this invention. Explanatory drawing showing an enlarged part of a metal container product. Explanatory drawing showing a part of a metal container body enlarged. Explanatory drawing showing a metal container product as seen from above. Explanatory drawing explaining an example of the manufacturing method of a metal container product. Explanatory drawing which shows the conventional easy-to-open container as seen from above.

Hereinafter, the metal container product 10 according to the embodiment of the present invention will be described with reference to the drawings.

First, in the metal container product 10 of the present embodiment, the content C is sealed by joining the lid material 50 to the flange portion 40 of the metal container body 20 so as to be peelable, and the lid material 50 is peeled off from the flange portion 40. It is a container with an easy peel type lid that can be opened.
As a method for joining the lid material 50, known joining methods such as heat joining (heat sealing, welding by high frequency heating or ultrasonic heating), crimping, and bonding with an adhesive interposed therebetween can be considered. Regardless of which method is used, the lid material 50 is bonded to the metal container body 20 and then the lid material 50 is peeled off to have sufficient bonding strength to be opened. In the description of this embodiment, a case where thermal bonding is used as a method of bonding the lid material 50 will be described.

As shown in FIGS. 1 and 2, the metal container body 20 has a cup portion 30 for accommodating the contents C and a flange portion 40 extending from the open end edge (upper end edge) 31 of the cup portion 30 to the outer peripheral side. Have.

As shown in FIGS. 2 to 4, the flange portion 40 includes a bonded portion 41 to which the lid material 50 is thermally bonded, a tapered portion 42 formed adjacent to the outer periphery of the bonded portion 41, and a tapered portion 42. It has a tip curl portion 43 continuously formed on the outer peripheral edge of the. As shown in FIG. 4, each of these parts is formed in an annular shape.

As shown in FIGS. 2 and 3, the bonded portion 41 is formed to be linear (that is, planar) when viewed in cross section. In the present embodiment, the lid material 50 is heat-bonded over the entire upper surface of the bonded portion 41, but the lid material 50 may be heat-bonded only to a part of the upper surface of the bonded portion 41. By heat-bonding the lid material 50 to the upper surface of the jointed portion 41, an annular joint portion 60 between the flange portion 40 and the lid material 50 is formed as shown in FIGS. 2 and 4. In FIG. 4, the lid material 50 is not shown, and in order to make it easier to understand the content of the invention, the outlines of 31, 41 to 44 of each part of the metal container body 20 are shown by solid lines. There is.
Further, the tapered portion 42 is formed so as to be inclined outward and downward with respect to the bonded portion 41. Further, the tapered portion 42 is formed to be linear (that is, planar) when viewed in cross section.
Further, the tip curl portion 43 is formed by curving the outer peripheral end portion of the flange portion 40 so as to be rounded inward and downward.

As shown in FIGS. 3 and 4, the open end edge 31 of the cup portion 30 and the inner peripheral edge of the joined portion 41 are connected by a convex bent portion 44 toward the inner peripheral side (upper side). .. In addition, the opening end edge 31 of the cup portion 30 and the inner peripheral edge of the bonded portion 41 may be connected by a refracting portion or another portion.
Further, in the present embodiment, the boundary portion between the outer peripheral edge of the bonded portion 41 and the inner peripheral edge of the tapered portion 42, and the boundary portion between the outer peripheral edge of the tapered portion 42 and the inner peripheral edge of the tip curl portion 43. Is formed by being smoothly bent (with an R), but may be formed by being bent.

The bonded portion 41 (and the tip curled portion 43) is formed so as to be tapered outward and downward, in other words, a flat surface (or the bottom of the cup portion 30) including the open end edge 31 of the cup portion 30. On the other hand, it is formed so as to be inclined toward the lower outside. Further, as a result, the tapered portion 42 and the tip curled portion 43 formed on the outer peripheral side of the bonded portion 41 are also inclined outward and downward.

As shown in FIG. 2, the lid material 50 is formed so as to project to the outer peripheral side of the bonded portion 41 in a state of being heat-bonded to the flange portion 40. The size of the lid material 50 may be arbitrarily designed. For example, the size of the lid material 50 is such that at least a part of the outer peripheral portion of the lid material 50 is located on the outer peripheral side of the tip curl portion 43. May be designed.

Next, an example of a method for manufacturing the metal container product 10 will be described below.

First, as shown in FIG. 5A, the flange portion 40 is in a flat state (that is, the joint portion 41 is parallel to the plane including the open end edge 31 of the cup portion 30). The tip curl portion 43 is formed by bending (or pressing) the vicinity of the outer peripheral edge of the 40 (first step).

In this first step, the tapered portion 42 is formed by inclining a portion on the inner peripheral side of the tip curl portion 43 with respect to the bonded portion 41 during processing. By forming the tapered portion 42 in this way, it becomes easy to round the vicinity of the outer peripheral edge of the flange portion 40 by processing using a punch and a die, and the tip curled portion 43 can be easily formed. The tapered portion 42 may be formed before the tip curled portion 43 is processed.

Next, as shown in FIG. 5 (b), the content C is filled in the cup portion 30 (second step).

Next, as shown in FIG. 5 (c), the lid material 50 is thermally bonded to the bonded portion 41 in a state where the bonded portion 41 of the flange portion 40 is flat (third step).
As described above, by thermally bonding the lid material 50 to the bonded portion 41 in a flat state, the thermal bonding of the lid material 50 to the bonded portion 41 can be easily achieved.

Next, as shown in FIG. 5D, the flange portion is bent (or pressed) near the inner peripheral edge of the bonded portion 41 so that the bonded portion 41 inclines in a tapered shape toward the outer lower side. Apply to 40 (4th step).

In this embodiment, the first step shown in FIG. 5A and the second to fourth steps shown in FIGS. 5B to 5D are carried out in different places / facilities / equipment, for example. The first step shown in FIG. 5A is carried out by the container manufacturer, and the second to fourth steps shown in FIGS. 5B to 5D are carried out by the filling maker filling the content C. However, the first to fourth steps may be carried out at the same place / facility / equipment.

Further, in the present embodiment, the bending (or pressing) of the first and fourth steps is carried out by using a punch and a die as tools. However, the specific processing method is not limited to this.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.

For example, the material of the metal container main body 20 may be any material such as a metal layer made of aluminum, steel, or the like, and a resin laminated layer such as PET (polyethylene terephthalate) formed on the metal layer.
Further, the material of the lid material 50 may be any material such as one in which a resin laminate such as nylon, PP, and PET is applied to the surface of a metal layer such as aluminum.
When the resin laminated layer (innermost layer on the lid material 50 side) of the metal container body 20 is made of PET and the innermost layer of the lid material 50 (innermost layer on the metal container body 20 side) is made of PET, the bonded portion 41 A so-called spot coat may be applied on the upper surface of the above surface by locally applying a thermoplastic resin such as PP (polypropylene). By applying the spot coat, the bondability between the PET resins can be improved. On the other hand, if the PET layer of the metal container body 20 and the PET layer of the lid material 50 are directly bonded without the spot coat, merits such as reduction of production cost can be obtained.
Further, in the above-described embodiment, the jointed portion 41 of the flange portion 40 has been described as being formed in a straight line (that is, in a planar shape) when viewed in cross section, but a specific embodiment of the joined portion 41 is described. Not limited to the above, for example, the jointed portion 41 may be curved (upwardly convex or concave) when viewed in cross section. However, when the bonded portion 41 is formed in a straight line when viewed in cross section, not only the lid material 50 can be neatly heat-bonded to the bonded portion 41, but also between the bonded portion 41 and the tapered portion 42. Since it is possible to make the boundary between the two parts clearer, it is preferable to form the bonded portion 41 in a straight line.
Further, in the above-described embodiment, the tapered portion 42 of the flange portion 40 has been described as being formed in a straight line (that is, in a planar shape) when viewed in cross section, but the specific embodiment of the tapered portion 42 is described above. Without limitation, for example, the tapered portion 42 may be curved (upwardly convex or concave) when viewed in cross section. However, when the tapered portion 42 is formed in a straight line when viewed in cross section, the boundary between the bonded portion 41 and the tapered portion 42 can be made clearer, so that the bonded portion 41 is formed. It is preferably formed in a straight line.
Further, in the above-described embodiment, the tilt angle of the bonded portion 41 is set to be about 10 ° after molding (the angle after springback of the flange portion 40), but the tilt angle of the bonded portion 41 is about. It can be set in any range from 5 ° to 60 °. If the tilt angle is less than 5 °, the contribution to pressure resistance is insufficient, and if the tilt angle is larger than 60 °, wrinkles generated on the outer peripheral edge of the lid material become large, and there is a concern that the openability is deteriorated. Further, if the inclination angle of the bonded portion 41 is set to 10 ° or more, the pressure resistance of the metal container product 10 is improved. Therefore, it is preferable to set the inclination angle of the bonded portion 41 to 10 ° or more.
Further, in the above-described embodiment, the taper portion 42 is formed adjacent to the inner peripheral side of the tip curl portion 43, but another portion is formed between the tip curl portion 43 and the taper portion 42. It may be formed by interposing.
Further, in the above-described embodiment, the jointed portion 41 has been described as being inclined in a tapered shape toward the lower outside, but the joined portion 41 is not inclined in a tapered shape, and the open end of the cup portion 30 is formed. It may be formed parallel to the plane including the edge 31 (or the bottom of the cup portion 30).

10 ・ ・ ・ Metal container product 20 ・ ・ ・ Metal container body 30 ・ ・ ・ Cup part 31 ・ ・ ・ Opening edge 40 ・ ・ ・ Flange part 41 ・ ・ ・ Jointed part 42 ・ ・ ・ Tapered part 43 ・・ ・ Tip curl part 44 ・ ・ ・ Bending part 50 ・ ・ ・ Cover material 60 ・ ・ ・ Joint part C ・ ・ ・ Contents

Claims (3)

The lid material is detachably joined to the flange portion of the metal container body by thermal bonding, crimping, or adhesion, and the joint between the flange portion and the lid material is peeled off and opened . The main body of the container
The metal container body includes a cup portion and a flange portion extending from the open end edge of the cup portion to the outer peripheral side.
The flange portion is formed adjacent to the bonded portion to which the lid material is bonded by heat bonding, crimping, or bonding over the entire upper surface thereof, and the outer periphery of the bonded portion, with respect to the bonded portion. A metal container body characterized by having a tapered portion inclined outward and downward and a tip curled portion formed on the outer peripheral edge of the flange portion. The metal container body according to claim 1, wherein the bonded portion and the tapered portion are each formed so as to extend linearly when viewed in cross section. A metal container product comprising the metal container body according to claim 1 or claim 2 and the lid material.

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