WO2019107064A1 - Metal container body, metal container product, production method of metal container product - Google Patents

Abstract

The purpose of the present invention is to provide a metal container body capable of improving the ease of opening while ensuring pressure resistance with a simple configuration, a metal container product, and a production method of the metal container product. The metal container body (20) is a metal container body (20) of a metal container product (10) produced by joining a lid member (50) to a flange section (40) of the metal container body (20) in a peelable manner. The metal container body (20) comprises a cup section (30) and the flange section (40), wherein the flange section (40) has a joined part (41) where the lid member (50) is joined thereto and a tip curled part (43) formed on the outer peripheral edge of the flange section (4), said the joined part (41) being formed into a tapered-shape inclining outward and downward.

Description

Metal container body, metal container product, and method of manufacturing metal container product

The present invention seals a content by joining a lid to a flange portion of a metal container body, and peels off the lid from the flange portion to open the metal container body of a metal container product, a metal container product And a method of manufacturing a metal container product.

2. Description of the Related Art Conventionally, as a container for sealing and storing food and the like, the contents are sealed by thermally bonding (for example, heat sealing) the lid to the flange portion of the container body, and the lid is used as a flange when opening the container. An easily openable container (a container with an easy peel type lid) which is peeled off from a part and opened is widely used (see, for example, Patent Documents 1 to 3).

JP-A-6-48468 Japanese Patent Application Laid-Open No. 11-49237 Japanese Utility Model Application Publication No. 3-60276

This type of easy-open container is required to have pressure resistance to resist peeling of the thermal joint between the container body and the lid by the internal pressure in the container before opening, and at the same time, at the time of opening In addition, the easy openability which makes it easy to peel lid material from a container main part is also required.

However, since the pressure resistance and the easy opening property of these easily openable containers are opposite to each other, some contrivance is required to achieve both the pressure resistance and the easy opening property.

Therefore, the present invention solves these problems, and has a simple structure, a metal container body capable of improving easy-openability while securing pressure resistance, a metal container product, and It is an object of the present invention to provide a method for producing a metal container product.

The metal container main body of the metal container product of the present invention is a metal container main body of a metal container product in which the lid material is peelably joined to the flange portion of the metal container main body, and the metal container main body is A cup portion, and the flange portion extending outward from an open end edge of the cup portion, the flange portion being formed on a joined portion to which the lid member is joined and an outer peripheral edge of the flange portion The above-mentioned subject is solved by forming a tip end curled portion and forming the to-be-joined portion so as to be tapered toward the outer side and the lower side.
Another aspect of the metal container main body of the metal container product of the present invention is a metal container main body of a metal container product in which the lid material is releasably joined to the flange portion of the metal container main body, The container body includes a cup portion and the flange portion extending outward from the opening edge of the cup portion, the flange portion being a portion to be joined to which the lid member is joined, and the portion to be joined The object is achieved by having a tapered portion formed adjacent to the outer periphery and having a tapered portion inclined downward and outward with respect to the joined portion, and a tip curled portion formed on the outer peripheral edge of the flange portion. Solve the problem.
The metallic container product of the present invention solves the above-mentioned subject by having the metallic container main body and the lid.
The method for producing a metal container product according to the present invention is a method for producing a metal container product comprising a lid material releasably joined to a flange portion of a metal container body, wherein the outer peripheral edge of the flange portion is curled at its tip. The lid material is joined to the joined portion of the flange portion of the metal container main body in which the portion is formed, and thereafter, the problem is solved by inclining the joined portion downwardly and outwardly .

According to the first aspect of the present invention, the flange portion of the metal container body has a joined portion to which the lid material is peelably joined, and a tip curl portion formed on the outer peripheral edge of the flange portion. The bonding portion is formed to be tapered toward the outer side and the lower side.
Thus, in addition to the safety of the user's finger or the like being secured by forming the tip curled part, wrinkles may be generated in the flange even when the inclination angle of the part to be joined is increased. In order to suppress the reduction of the pressure resistance of the metal container product due to the occurrence of wrinkles with a simple configuration, the inclination angle of the joined portion is increased, and the easy openability of the metal container product is obtained. It can be improved.

According to the second and third aspects of the present invention, the flange portion is formed adjacent to the outer periphery of the joined portion, and has a tapered portion which inclines outward and downward with respect to the joined portion.
Thereby, it is possible to cause the boundary between the joint and the taper to function as a portion that defines the outer periphery of the joint between the flange and the lid, and the outer periphery of the joint is distorted. Can be avoided. As a result, since it is not necessary to design the radial width dimension of the joint in an excessively large size in consideration of the disturbance of the outer peripheral edge of the joint, the width of the joint in the radial direction is ensured while securing the desired pressure resistance. The size can be designed to be small, and the miniaturization of the flange portion and the improvement of the easy opening property can be realized.
Moreover, when joining a flange part and a lid material, before the said joining, what is called a spot coat which apply | coats a thermoplastic resin locally may be given to the upper surface of the to-be-joined part of a flange part. However, since the boundary between the bonding portion and the tapered portion can be made to function as a portion that defines the outer periphery of the spot coat, it is possible to reliably prevent the occurrence of the disturbance in the outer periphery of the bonding portion.
In addition, by forming a tapered portion that inclines outward and downward with respect to the joined portion between the joined portion and the tip curled portion, regardless of the size and the shape of the tip curled portion, Since a gap can be reliably generated between the flange portion and the lid on the outer peripheral side, fingers can be easily inserted into the gap, and the easy opening property can be improved.
In addition, since a tapered portion that inclines outward and downward with respect to the joined portion is formed between the joined portion and the end curled portion, a large-scale installation is required compared to roll processing and the like. The tip curl portion can be easily formed by processing using a punch and a die. That is, when forming the metal container main body, by forming the tapered portion and inclining the inner circumferential side portion of the tip curled portion when processing the tip curled portion or before processing the tip curled portion, By processing using a punch and a die, the vicinity of the outer peripheral edge of the flange portion can be easily rounded, and the end curled portion can be easily formed.
According to the invention of claim 4, the joined portion and the tapered portion are each formed to extend linearly when viewed in cross section, so that the lid member is attached to the joined portion of the metal container main body. Not only can be easily joined, but it is also possible to make the boundary between the joined part and the tapered part clearer, which functions as a site that defines the outer peripheral edge of the joined part between the flange part and the lid Therefore, the occurrence of the disturbance at the outer peripheral edge of the joint can be reliably avoided.

Explanatory drawing which shows the metal container products which concern on one Embodiment of this invention. Explanatory drawing which expands and shows a part of metal container products. Explanatory drawing which expands and shows a part of metal container main body. Explanatory drawing which sees a metal container product seeing from upper direction. Explanatory drawing explaining an example of the manufacturing method of metal container products. Explanatory drawing which sees the conventional easily openable container seeing from upper direction.

DESCRIPTION OF SYMBOLS 10 ... Metal container product 20 ... Metal container main body 30 ... Cup part 31 ... Opening edge 40 ... Flange part 41 ... Bonded part 42 ... Taper part 43 · · · Tip curling portion 44 · · · Bending portion 50 · · · Lid 60 · · · Joint C · · · Contents

Hereinafter, a metal container product 10 according to an embodiment of the present invention will be described based on the drawings.

First, the metallic container product 10 of the present embodiment seals the contents C by peelably joining the lid member 50 to the flange portion 40 of the metallic container main body 20, and peels off the lid member 50 from the flange portion 40. It is a container with an easy peel type lid which is made to open.
As a method of joining the lid member 50, a known joining method such as thermal joining (heat sealing, welding by high frequency heating or ultrasonic heating), pressure bonding, or adhesion with an adhesive interposed can be considered. Whichever method is used, after the lid member 50 is joined to the metal container main body 20, the lid member 50 is peeled off, and the lid member 50 has a bonding strength that can be opened. In the description of the present embodiment, a case of using thermal bonding as a method of bonding the lid member 50 will be described.

As shown in FIG. 1 and FIG. 2, the metal container main body 20 includes a cup portion 30 for containing the contents C, and a flange portion 40 extending outward from the open end edge (upper end edge) 31 of the cup portion 30. Have.

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

The to-be-joined part 41 is formed in linear form (namely, planar shape), when it sees in a cross section, as shown in FIG.2 and FIG.3. In the present embodiment, the lid member 50 is thermally bonded over the entire upper surface of the bonded portion 41, but the lid member 50 may be thermally bonded only to a partial region of the upper surface of the bonded portion 41. By thermally joining the lid member 50 to the upper surface of the joined portion 41, as shown in FIG. 2 and FIG. 4, an annular joint portion 60 between the flange portion 40 and the lid member 50 is formed. In addition, in FIG. 4, the lid member 50 is not illustrated, and in order to make it easy to understand the contents of the invention, outlines of 31 and 41 to 44 of each part of the metal container main body 20 are shown by solid lines. There is.
Further, the tapered portion 42 is formed to be inclined outward and downward with respect to the bonded portion 41. The tapered portion 42 is formed in a linear shape (i.e., a planar shape) when viewed in cross section.
Further, the end curled portion 43 is formed to be curved so as to round the outer peripheral end of the flange portion 40 inward and downward.

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

The joined portion 41 (and the end curled portion 43) is formed to be tapered toward the outside and the lower side, in other words, a plane (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 to be inclined downward and outward. Further, as a result, the tapered portion 42 and the end curled portion 43 formed on the outer peripheral side of the bonded portion 41 are also inclined downward and outward.

As illustrated in FIG. 2, the lid member 50 is formed to have a size that protrudes to the outer peripheral side relative to the bonded portion 41 in a state of being thermally bonded to the flange portion 40. In addition, the size of the lid 50 may be designed arbitrarily, for example, the size of the lid 50 so that at least a part of the outer peripheral portion of the lid 50 is positioned on the outer peripheral side than the tip curled portion 43. May be designed.

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

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

In the first step, the tapered portion 42 is formed by inclining a portion on the inner peripheral side of the end curled portion 43 with respect to the joined portion 41 during processing. As described above, by forming the tapered portion 42, it is 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 end curled portion 43 can be easily formed. The tapered portion 42 may be formed before the distal end curled portion 43 is processed.

Next, as shown in FIG. 5B, the contents C are filled in the cup portion 30 (second step).

Next, as shown in FIG. 5C, the lid member 50 is thermally joined to the joined portion 41 in a state where the joined portion 41 of the flange portion 40 is flat (third step).
Thus, thermal bonding of the lid member 50 to the bonding portion 41 can be easily achieved by thermally bonding the lid member 50 to the bonding portion 41 while the bonding portion 41 is flat.

Next, as shown in FIG. 5 (d), a flange portion is bent (or pressed) in the vicinity of the inner peripheral edge of the joined portion 41 so that the joined portion 41 is tapered downward toward the outer side. Apply to 40 (the fourth step).

In the present embodiment, the first step shown in FIG. 5 (a) and the second to fourth steps shown in FIGS. 5 (b) to 5 (d) are performed in different places, facilities, and facilities, for example, The first step shown in FIG. 5A is performed by a container manufacturer, and the second to fourth steps shown in FIGS. 5B-5D are performed by a filling maker for filling contents C. However, the first to fourth steps may be performed at the same place, facility, or facility.

Further, in the present embodiment, the bending process (or press process) in the first and fourth steps is performed using a punch and a die as a tool. However, the specific processing method is not limited to this.

In the metal container body 20 of the present embodiment obtained in this manner, the flange portion 40 of the metal container body 20 is attached to the joined portion 41 to which the lid member 50 is peelably joined, and the outside of the flange portion 40 And a to-be-joined part 41 is formed to be inclined in a tapered shape toward the outer side and the lower side. Thus, in addition to the safety of the user's finger or the like being secured by forming the end curled portion 43, the flange portion 40 has a wrinkle even when the inclination angle of the joined portion 41 is increased. In order to suppress the occurrence of the metal container product with a simple configuration, the inclination angle of the bonding portion 41 is increased while avoiding the decrease in the pressure resistance of the metal container product 10 caused by the occurrence of wrinkles. The easy openability of 10 can be improved.
That is, according to the methods proposed in Patent Literatures 1 and 2, the flange portion of the container body is inclined downward toward the outside to facilitate easy opening even without increasing the bonding strength between the container body and the lid member. The pressure resistance of the sex container can be improved. Thereby, even when the bonding strength between the container body and the lid member is set weak, it is possible to obtain the same pressure resistance as in the case where the flange portion is not inclined, so the container body and the lid member The joint strength between them and the inclination angle of the flange portion can be adjusted to improve both the pressure resistance and the easy openability of the easy-open container. However, when the container body is formed of metal such as aluminum, if the flange portion of the container body is inclined to a large degree in order to obtain greater pressure resistance, wrinkles will be generated in the flange portion (specifically, Since the outer peripheral edge of the flange portion undulates along the circumferential direction, wrinkles are generated in the flange portion), so that there is a limit to the inclination angle at which the flange portion can be inclined. When wrinkles occur in the flange portion, peeling easily occurs in the thermal bonding portion between the flange portion and the lid member, and it becomes difficult to secure a desired pressure resistance.
So, in the metal container main body 20 of this embodiment, the said problem can be solved by providing said structure.

Further, in the metal container main body 20 of the present embodiment, the flange portion 40 is formed adjacent to the outer periphery of the joined portion 41, and has a tapered portion 42 inclined downward and outward with respect to the joined portion 41. doing. Thereby, it is possible to cause the boundary between the bonding portion 41 and the taper portion 42 to function as a portion that defines the outer peripheral edge of the bonding portion 60 between the flange portion 40 and the lid member 50. It is possible to avoid that the outer peripheral edge of 60 is disturbed. As a result, since it is not necessary to design the radial width dimension of the bonding portion 60 extra large in consideration of the disturbance of the outer peripheral edge of the bonding portion 60, the diameter of the bonding portion 60 can be secured while securing desired pressure resistance. The width dimension in the direction can be designed to be small, and the miniaturization of the flange portion 40 and the improvement of the easy opening property can be realized.
That is, in the conventional easy-open container of this type, as shown in FIG. 6, the easy-open container 110 is formed by the thermal bonding portion 160 in which a lid member (not shown) is thermally bonded to the flange portion 140 of the container body 120. The pressure resistance of the easily openable container 110 which resists peeling of the thermal bonding part 160 due to the internal pressure inside is secured. However, since the thermal bonding 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 thermal bonding portion 160 is easily disturbed. As a result, it is difficult to form the radial widths W1 to W3 of the thermal bonding portion 160 uniformly. Therefore, in order to ensure the desired pressure resistance, the radial width dimension of the thermal bonding portion 160 must be designed to be extra large in consideration of the disturbance of the outer peripheral edge 161 of the thermal bonding portion 160 described above. As a result, in addition to the flange portion 140 becoming large in the radial direction, there is a problem that the easy openability of the easily openable container 110 which makes it easy to peel off the lid material from the container body 120 is lowered. Further, in the case of the easily openable container 110 disclosed in Patent Document 1, the tip end curled portion 143 formed on the outer peripheral edge of the flange portion 140 is more than the joined portion 141 to which the lid member of the flange portion 140 is thermally joined. It is also conceivable to use the boundary between the joined part 141 and the end curled part 143 as a part for defining the outer edge of the thermal joint 160 because it is lowered downward. However, when the container body 120 is formed of metal such as aluminum, the end curled portion 143 is formed by rounding the outer edge portion of the flange portion 140, so it is difficult to form the end curled portion 143 with high accuracy. It is difficult to use the boundary between the bonding portion 141 and the tip curl portion 143 as a portion for defining the outer edge of the thermal bonding portion 160.
So, in the metal container main body 20 of this embodiment, the said problem can be solved by providing said structure.

As mentioned above, although the embodiment of the present invention was explained in full detail, the present invention is not limited to the above-mentioned embodiment, and various design changes can be made without departing from the present invention described in the range of a claim. It is.

For example, the material of the metal container main body 20 may be any material such as a resin laminate layer such as PET (polyethylene terephthalate) formed on a metal layer made of aluminum, steel or the like.
Further, the material of the lid member 50 may be any material such as a resin layer such as nylon, PP, or PET on the surface of a metal layer such as aluminum.
When the resin laminate layer (innermost layer on the lid 50 side) of the metal container main body 20 is made of PET and the innermost layer (innermost layer on the metal container main 20 side) of the lid 50 is made of PET, A so-called spot coat may be applied to the upper surface of the above to locally apply 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, direct bonding between the PET layer of the metal container body 20 and the PET layer of the lid member 50 without spot coating can provide merits such as reduction in production cost.
Moreover, although the to-be-joined part 41 of the flange part 40 was demonstrated as what is formed in linear form (namely, planar shape) in the cross sectional view in embodiment mentioned above, the concrete aspect of the to-be-joined part 41 is It is not limited to the above, for example, the to-be-joined part 41 may be curving (in convex shape or concave shape upward), when a cross sectional view is carried out. However, when the to-be-joined part 41 is formed in linear shape when cross-sectionally viewed, not only the lid member 50 can be thermally bonded to the to-be-joined part 41 neatly but also between the to-be-joined part 41 and the tapered portion It is preferable to form the part to be joined 41 in a straight line, since it is possible to make the boundary of
Moreover, although the taper part 42 of the flange part 40 was demonstrated as what is formed in linear shape (namely, planar shape), when the cross-sectional view was carried out in embodiment mentioned above, the specific aspect of the taper part 42 is the above. For example, the taper portion 42 may be curved (convex upward or downward) when viewed in cross section. However, when the tapered portion 42 is formed in a linear shape when viewed in cross section, it is possible to make the boundary between the joined portion 41 and the tapered portion 42 clearer. It is preferable to form in a straight line.
Further, in the above-described embodiment, the inclination angle of the bonding portion 41 is set to about 10 ° after forming (the angle after spring back of the flange portion 40), but the inclination angle of the bonding portion 41 is about It can be set in any range of 5 ° to 60 °. If the inclination angle is less than 5 °, the contribution to the pressure resistance will be insufficient, and if the inclination angle is more than 60 °, the wrinkles generated on the outer peripheral edge of the lid material will be large, and the openability may be lowered. Moreover, since the pressure resistance of the metal container product 10 will improve if the inclination angle of the to-be-joined part 41 is set at 10 degrees or more, it is preferable to set the oblique angle of the to-be-joined parts 41 at 10 degrees or more.
In the embodiment described above, the tapered portion 42 is described as being formed adjacent to the inner peripheral side of the distal end curled portion 43, but another portion may be provided between the distal end curled portion 43 and the tapered portion 42. It may be formed to intervene.
In the embodiment described above, the tapered portion 42 is formed on the inner peripheral side of the distal end curled portion 43. However, without forming the tapered portion 42, the outer peripheral edge and the distal end curled portion of the joined portion 41 You may form so that the inner periphery of 43 may be continuous. However, at the time of forming processing of the metal container body 20, when processing the end curled portion 43 or before processing the end curled portion 43, the tapered portion 42 is formed to form the inner peripheral side of the end curled portion 43. By inclining, the outer peripheral edge of the flange portion 40 can be easily rounded by processing using a punch and a die, and the distal end curled portion 43 can be easily formed. Preferably, the portion 42 is formed.
In the above-described embodiment, the bonding portion 41 is described as being tapered downward toward the outer side, but the opening end of the cup portion 30 is not inclined to the bonding portion 41 in a taper shape. It may be formed parallel to the plane including the edge 31 (or the bottom of the cup portion 30).

Claims (6)

1. A metallic container body of a metallic container product in which a lid material is peelably joined to a flange portion of the metallic container body,
   The metal container main body includes a cup portion, and the flange portion extending outward from the open end of the cup portion.
   The flange portion has a joined portion to which the lid member is joined, and a tip curl portion formed on an outer peripheral edge of the flange portion,
   The said to-be-joined part is a metal container main body characterized by being inclined and formed in the taper shape toward the lower outside.
2. The said flange part is formed adjacent to the outer periphery of the said to-be-joined part, and has a taper part which inclines toward the outer side downward with respect to the said to-be-joined part. Metal container body.
3. A metallic container body of a metallic container product in which a lid material is peelably joined to a flange portion of the metallic container body,
   The metal container main body includes a cup portion, and the flange portion extending outward from the open end of the cup portion.
   The flange portion is a bonded portion to which the lid member is bonded, a tapered portion which is formed adjacent to the outer periphery of the bonded portion, and which is inclined downward and outward with respect to the bonded portion, and the flange And a tip curled portion formed on an outer peripheral edge of the portion.
4. The metal container main body according to claim 2 or 3, wherein the joined portion and the tapered portion are each formed to extend linearly when viewed in cross section.
5. A metal container product comprising the metal container main body according to any one of claims 1 to 4 and the lid member.
6. A method for producing a metal container product, comprising a lid material releasably joined to a flange portion of a metal container body,
   The lid member is joined to the joined portion of the flange portion of the metal container main body in which the tip curled portion is formed on the outer peripheral edge of the flange portion, and then the joined portion is inclined outward and downward A method of producing a metal container product characterized by the present invention.

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