JPH0811881A - Can lid - Google Patents

Abstract

(57) [Summary] [Purpose] A can that can be easily recycled by reliably preventing corrosion due to rust, etc. at the inner peripheral edge of the opening of the metal frame body that is adhered to the ceiling sealing material and wound around the can container. Provide a lid. [Structure] A coating film 8 is formed by coating a paint on at least the upper surface of a panel portion of a metallic lid frame 2. A folded-back portion 7 is provided on the entire circumference of the opening 6 of the lid frame body 2 by folding back the peripheral edge thereof.
The folded-back portion 7 is formed by folding the peripheral edge portion of the opening 6 so that its end edge is wound inside, and by folding back, the portion overlapped with the panel portion 5 is adhered via the coating film 8 to form the opening 6
Contain the edge of the inside of the folded part. The opening 6 is sealed so that it can be unsealed by the top sealing material 3 having at least the lower surface side covered with a synthetic resin film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can lid suitable for a container for powder or granules such as powder or granules opened by peeling off a ceiling sealing material.

[0002]

2. Description of the Related Art Conventionally, a can lid disclosed in Japanese Utility Model Laid-Open No. 62-108229 is known.

As shown in FIG. 12, this kind of can lid 50 has a panel portion 53 surrounded by the winding portion 52 with a winding portion 52 for winding the can container 51 on the outer peripheral edge portion. It is composed of a metallic lid frame body 55 in which the opening 54 is formed, and a ceiling sealing material 56 that seals and closes the opening so that the opening can be peeled off. Further, the inner peripheral edge of the opening 54 of the lid frame 55 is provided with a folding edge 57 formed by bending the end edge of the lid frame 55 toward the inside of the can container 51 at an acute angle. Then, on the upper and lower surfaces of the lid frame body 55,
A lacquer coating or a thermoplastic resin coating 58 is provided, and the ceiling sealing material 56 is provided with a thermoplastic resin coating 59 on the lower surface side of the aluminum foil. The ceiling sealing material 5
6 is a thermoplastic resin coating 5 on the panel portion 53 of the lid frame body 55.
The opening 54 is sealed by heat bonding via 7, 58.

By providing the folding edge 57, the can lid 50 can be used safely without opening the edge 60 of the can lid 50 after it is opened.

However, since the end edge 60 of the folding edge 57 is exposed in the can container 51, when the contents come into contact with or adhere to the can edge 51, the lid frame 55 is corroded due to the generation of rust at the end edge 60. May occur.

Therefore, as shown in FIG. 13, there is known a can lid 64 in which a synthetic resin frame 63 is integrally provided by injection molding on the peripheral portion of the opening 62 of the metallic lid frame 61. . The top sealing material 65 of the can lid 64 has a resin coating 66 on the surface of an aluminum foil, as in the above-mentioned case. The can lid 64 has an opening 62 formed by a frame 63.
Since the peripheral edge 67 is sealed, it is possible to prevent corrosion of the lid frame 61 due to rust or the like at the edge 67.

However, since the lid frame body 61 and the frame 63 are made of different materials, a step of injection-molding the frame 63 on the lid frame body 61 is required at the stage of manufacturing the lid frame body 61, and the work efficiency is lowered. In addition, there is a problem that the device for manufacturing the can lid 64 becomes complicated.

Further, in recent years, the can lid 64 is recycled according to the material after use. In order to recycle the can lid 64, a metal lid frame 61 and a synthetic resin frame 63 are used. The work for separating and is troublesome,
There is an inconvenience that smooth recycling cannot be expected.

[0009]

In order to solve this problem, the present invention ensures corrosion of the inner peripheral edge of the opening of the metallic lid frame body which is adhered to the top sealing material and wound around the can container. It is an object of the present invention to provide a can lid that is easy to prevent and that can be easily recycled.

[0010]

In order to achieve such an object, the present invention is provided with a winding portion for winding around a can container in an outer peripheral edge portion, and an opening is formed in a panel portion surrounded by the outer peripheral edge portion. A lid frame body made of metal, a tab for peeling opening is provided on the outer peripheral edge portion, and a coating layer is provided on at least the lower surface side, and a ceiling made of metal foil for sealing the opening portion. A can lid comprising a face seal material, the top face seal material being releasably adhered to a coating film provided by coating a paint on at least the upper surface of the panel portion of the lid frame body, wherein the opening A folded portion formed by folding back the peripheral edge of the portion is provided on the entire circumference of the opening,
The folded-back portion is formed by folding the peripheral portion of the opening so that its end edge is wound inside the folded-back portion and is bonded to the panel portion of the folded-back portion through the coating film. It is characterized in that the edge is enclosed inside the folded portion. The coating layer on the lower surface side of the ceiling sealing material may be a synthetic resin film bonded,
The paint may be applied.

In the present invention, the paint does not have to be applied to the entire surface of the lid frame body, and the portion of the panel portion to which the ceiling sealing material is adhered and the folded portion are superposed on the panel portion. It suffices that the part to be bonded is painted.

Further, in the can lid of the present invention, an annular convex portion projecting upward along the opening is provided on the panel portion of the lid frame body, and the ceiling sealing material is provided on the top of the convex portion. It is characterized in that it is provided so that it can be peeled off. The convex portion may be formed by projecting the folded-back portion above a panel portion of the lid frame body. When providing the convex portion,
In order to more easily peel off the ceiling sealing material, a cut portion is formed in the coating film along both side edges of the top of the convex portion, and the ceiling seal is formed on the coating film between the cut portions. It is preferable that the material is adhered or provided, or that the coating film is provided only on the top portion of the convex portion by coating the coating material.

Further, the can lid of the present invention is characterized in that the panel portion of the lid frame body is provided with a step so that the folded-back portion is located below a surface to which the ceiling sealing material is adhered. To do.

[0014]

In the can lid of the present invention, since the peripheral edge of the opening is rolled up and enclosed by the folded-back portion, the edge is the content,
It does not come into contact with the outside air, etc., and corrosion due to rust etc. is prevented. That is, when the folded-back portion is formed, a part of the folded-back portion overlaps with a part of the panel portion. And
Since at least the upper surface of the panel portion is coated with a paint to form a coating film, the coating film is interposed in the polymerized portion. By adhering the polymerized portions to each other through the coating film, the peripheral edge of the opening can be reliably sealed in the folded portion.

In the can lid of the present invention, since the ceiling sealing material and a part of the folded-back portion are adhered to the panel portion through the coating film, the paint is the ceiling seal on the upper surface of the panel portion. It suffices that the portion to which the material is adhered and the portion where the folded-back portion is superposed and adhered to the panel portion are coated, and by doing so, the amount of the coating material used is reduced.

Further, by providing the annular convex portion on the panel portion of the lid frame and adhering the ceiling sealing material to the top portion of the convex portion, the ceiling sealing material is attached to the top portion of the convex portion. Since the dispersion of heat when heated and pressed is regulated, the adhesive is surely bonded. At the same time, since the bonding area is limited to the top of the convex portion, the top sealing material can be easily peeled off.

At this time, by forming the folded-back portion so as to project above the panel portion, the folded-back portion can be the convex portion.

Further, a pair of cuts are formed in the coating film along both side edges of the top of the convex portion, and the ceiling sealing material is adhered to the coating film between the cuts to form the ceiling. When the face seal material is peeled off from the top of the convex portion, the top face seal material is peeled off while the coating film is broken by the cuts, so that a smooth peeling and opening operation can be performed.

Further, by providing a step on the panel portion of the lid frame so that the folded-back portion is located below the surface to which the ceiling sealing material is adhered, the ceiling sealing material is attached to the panel portion. When heated and pressed, since there is nothing that interferes with the heating and pressing under the surface to which the ceiling sealing material is bonded, the bonding can be performed easily and reliably.

[0020]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing a can lid of one embodiment of the present invention, FIG. 2 is an explanatory view showing a part of the can lid of FIG. 1 by breaking it, and FIG. 3 (a) is a main part of FIG. FIG. 3 is an enlarged view of FIG.
3B is an explanatory view showing another example of FIG. 3A, and FIG.
6 is an explanatory view showing another example of FIG. 5 in an enlarged manner, FIG. 5B is an explanatory view showing another example of FIG. 5A, and FIG. 2 is an explanatory diagram showing another example of FIG. 2, FIGS. 7 to 9 are explanatory diagrams showing another example of FIG. 6, FIG. 10 is an explanatory diagram illustrating a part of the configuration and action of FIG. 6, and FIG. It is explanatory drawing which shows the further another example of FIG.

As shown in FIG. 1, the can lid 1 is composed of a metallic lid frame body 2 and an opening top sealing material 3 provided on the lid frame body 2 so as to be removable. There is.

As shown in FIG. 2, the lid frame body 2 includes a winding portion 4 for winding around the can container X, a panel portion 5 extending inward from the winding portion 4, and the panel. The circular opening 6 is formed in the portion 5, and the folded portion 7 is formed on the peripheral edge of the opening 6. In addition, as shown in FIG. 3A, a coating film 8 formed by coating a paint is formed on the entire upper surface side of the lid frame body 2 from the outer peripheral edge of the winding portion 4 to the inner peripheral edge of the opening 6. It has been subjected. The coating film 8 is formed, for example, by applying an epoxy-based paint in which low-density polyethylene powder, polypropylene powder, etc. are dispersed, and then baking at 190 ° C. for about 10 minutes. As will be described later,
The coating film 8 may be applied to the entire upper surface side of the lid frame 2 or both the upper surface side and the lower surface side.

Further, in the upper part of the peripheral edge of the opening 6,
The peripheral portion of the ceiling sealing material 3 is peelably adhered to the coating film 8 by heating, whereby the opening 6 is closed. The ceiling sealing material 3 is formed of an aluminum foil whose upper and lower surfaces are covered with a synthetic resin film, and a closing portion 9 which covers and closes the opening 6, and a peripheral edge of the closing portion 9. And a tab 10 for a peeling opening that extends outward from a part of the above. The tab 10 is provided by folding back from the boundary of the closed portion 9 to the upper surface side of the closed portion 9. This allows tab 1
The size of 0 can be formed to be relatively large, and it can be easily gripped during unsealing work without disturbing the work such as winding.

The folded portion 7 of the opening 6 is shown in FIG.
As shown in FIG. 5, the peripheral edge 6a of the opening 6 is formed by winding it downward and folding it. At this time, the folded portion 7
As shown in FIG. 3A, the folded back part overlaps with a part of the lower surface of the panel part 5. Since the coating film 8 made of the coating material is provided on the entire upper surface side of the lid frame body 2 from the outer peripheral edge of the winding portion 4 to the inner peripheral edge of the opening 6, the above-mentioned overlapped portion is formed. Is coated with the coating film 8. The peripheral edge 6a of the opening 6 is enclosed in the folded portion 7 by adhering the polymerized portions to each other via the coating film 8. As a result, the peripheral edge 6a of the opening 6 is not exposed, and the occurrence of rust or the like can be reliably prevented. Further, since the paint, which is the coating film 8 on the upper surface of the lid frame body 2, and the synthetic resin film coated on the surface of the top surface sealing material 3 are easily adhered to each other, the opening 6 is formed by the top surface sealing material 3. Can be reliably and firmly closed. The top sealing material 3 is adhered to the upper surface of the lid frame body 2 by, for example, high frequency heating.
It is also transmitted to the coating film 8 and the fold-back portion 7 and the panel portion 5 can be bonded via the coating film 8.

As shown in FIG. 3 (b), even when the coating film 8 is applied to both the upper surface side and the lower surface side of the lid frame body 2, a part of the folded-back portion 7 is folded back. When a part of the lower surface of the panel portion 5 is superposed, the coating film 8a on the lower surface of the panel portion 5 and the coating film 8b on the folded back portion abut each other and can be easily adhered to each other. The edge 6a can be reliably sealed inside the folded-back portion 7.

Further, as shown in FIG. 4, the folded-back portion 7
May be formed by winding the peripheral edge 6a of the opening 6 upward and folding it back. Also by this, when the coating film 8 is provided only on the upper surface side of the lid frame body 2, the folded-back portion 7 has the shape shown in FIG.
As shown in (a), the folded back part overlaps with a part of the upper surface of the panel part 5. Then, the coating film 8 is interposed in the polymerized portion. By adhering the above-mentioned polymerized portions to each other via the coating film 8, the peripheral edge 6a of the opening 6 can be enclosed inside the folded-back portion 7, and the coating film 8 on the upper surface of the lid frame 2 can be further sealed. The paint and the synthetic resin film coated on the surface of the ceiling sealing material 3 can be easily adhered to each other.

As shown in FIG. 5 (b), even when the coating film 8 is applied to both the upper surface side and the lower surface side of the lid frame body 2, a part of the folded-back portion 7 is folded back. When polymerized on a part of the upper surface of the panel portion 5, the coating film 8b on the upper surface of the panel portion 5 and the coating film 8a on the folded back portion abut each other and can be easily adhered to each other. The edge 6a can be reliably sealed inside the folded-back portion 7.

Further, as shown in FIG. 6 or 7, it is preferable that the panel portion 5 of the lid frame body 2 is provided with an annular convex portion 11 projecting upward along the opening portion 6. Then, by heating and pressing the top sealing material 3 on the top of the convex portion 11, the dispersion of heat at the time of heating is regulated by the convex portion 11, so that the top sealing material 3 is placed on the panel portion 5. It can be surely adhered, and further the above-mentioned ceiling sealing material 3
Since the adhesion range between the panel portion 5 and the panel portion 5 is limited to the top of the convex portion 11, the top surface sealing material 3 can be easily peeled from the panel portion 5.

Further, as shown in FIG. 8 or 9, the folded portion 7 may be projected above the panel portion 5 to form the convex portion 11. However, when the folded-back portion 7 is formed by winding the peripheral edge 6a of the opening 6 upward as shown in FIG. 9, the upper surface of the folded-back portion 7 is located on the lower surface side of the lid frame body 2. Therefore, when the coating film 8 is applied only to the upper surface of the lid frame body 2, there is no coating film 8 on the top of the convex portion 11, and the top surface sealing material 3
There is a concern that the adhesiveness between the convex portion 11 and Therefore, if the coating film 8 is applied to both upper and lower surfaces of the lid frame body 2 and the convex portion 11 is formed by the upper portion of the folded portion 7, the adhesiveness between the ceiling sealing material 3 and the convex portion 11 of the lid frame body 2 is improved. Is sufficiently strong, and reliable sealing of the opening 6 by the ceiling sealing material 3 can be obtained.

Further, as shown in FIG. 10A, it is preferable to form cuts 12 and 13 in the coating film 8 along both side edges of the top of the convex portion 11. That is, when the ceiling sealing material 3 is adhered to the coating film 8c between the cut portions 12 and 13, when the ceiling sealing material 3 is peeled from the panel portion 5 when the closing portion 9 is opened. , Fig. 10
As shown in (b), the coating film 8 between the cut portions 12 and 13
c is adhered to the back surface of the ceiling sealing material 3 and is peeled off from the top of the convex portion 11, and the ceiling sealing material 3 is bonded to the convex portion 1.
The top sealing material 3 can be easily peeled off even if the top sealing material 3 is firmly adhered to the top of the sealing material 1.
The appearance of the peeled marks on the panel portion 5 after peeling is also good.
The coating film 8 may be applied only to the portion sandwiched between the cut portions 12 and 13 instead of forming the cut portions 12 and 13 as shown in FIG.

Further, as shown in FIG. 11, the lid frame 2 is provided with a bent portion 14 on the panel portion 5, and the folded portion 7 is located below the surface to which the ceiling sealing material 3 is adhered. Thus, the step 15 may be provided. By doing so, when the top sealing member 3 is heated and pressed onto the edge of the upper panel portion 5a divided by the bent portion 14, the heating member is not applied to the lower side of the upper panel portion 5a. Since there is nothing that interferes with the pressure, the ceiling sealing material 3 is easily and surely bonded.

In the lid frame body 2 shown in FIG. 11, an opening 6 is provided in a lower panel portion 5b sectioned by a bent portion 14, and a peripheral end edge 6a of the opening 6 is wound downward to be folded back. 7 is formed, and the configuration of the folded portion 7 is shown in FIG.
It is similar to (a) or FIG. 3 (b). The folded-back portion 7 may be formed by winding the peripheral edge 6a of the opening 6 upward, and the configuration thereof is as shown in FIG.
The same as in (b).

In the lid frame body 2 shown in FIG. 11, the folding portion 7 is
Since the top sealing material 3 is separated from the bonded portion, the overlapping portion of the folded portion 7 and the lower panel portion 5b is bonded by heating and pressurizing independently of the bonding of the ceiling sealing material 3. To do.

In each of the above-mentioned embodiments, the coating film 8 is formed by coating the entire surface of the upper surface or the lower surface of the panel portion 5 with the coating material. It suffices that a part of the folded-back portion 7 is coated on the portion where the folded-back portion 7 is polymerized and adhered to the panel portion 5. By doing so, the coating material can be saved and the manufacturing cost can be reduced. When the paint is applied as described above, the paint is applied to a predetermined position on the original plate of the lid frame body 2, and the painted portion is adhered to the ceiling sealing material 3 of the panel unit 5. The original plate may be punched and processed into a predetermined shape so as to become a portion to be formed and a portion to be overlapped with the panel portion 5 of the folded portion 7.

[0036]

As is apparent from the above, according to the present invention, since the peripheral edge of the opening is wound and contained by the folded portion, corrosion due to rust or the like from the edge is surely prevented. In addition, the conventional synthetic resin frame can be provided by firmly adhering the coating film provided on the panel portion to the coating layer provided on the surface of the ceiling sealing material. Instead, the opening can be surely closed by the ceiling sealing material. As a result, the separation work for each material at the time of recycling can be eliminated.

Further, the manufacturing cost can be reduced by applying the coating material only to a required portion.

Further, by providing the annular convex portion on the panel portion of the lid frame and adhering the ceiling sealing material to the top portion of the convex portion, the ceiling sealing material is attached to the top portion of the convex portion. Dispersion of heat when heated and pressed can be regulated by the convex portion, and reliable adhesion can be achieved. Furthermore, the bonding range between the ceiling sealing material and the panel portion of the lid frame is limited to the top of the convex portion, and easy peeling can be achieved at the same time.

At this time, the step of forming the convex portion can be omitted by forming the convex portion by projecting the folded-back portion above the panel portion of the lid frame.

Further, a pair of cuts are formed in the coating along both side edges of the top of the convex portion, and the ceiling sealing material is adhered to the coating between the cuts to form the ceiling. When peeling the face seal material from the top of the convex portion, the top face seal material is peeled off while the coating film is broken by both cuts, so the top face seal material is firmly adhered to the top portion of the convex portion. Also, the peeling and unsealing work can be easily performed.
The appearance of the peeled marks after opening can also be made good.

The ceiling sealing material is adhered by providing a step on the panel portion of the lid frame so that the folded-back portion is located below the surface to which the ceiling sealing material is adhered. Since there is nothing under the surface to interfere with the heating and pressing, the top sealing material can be easily and surely bonded.

Therefore, according to the present invention, it is possible to reliably prevent corrosion due to rust or the like on the inner peripheral edge of the opening without providing a conventional synthetic resin frame. Further, since the conventional synthetic resin frame is not provided, it is possible to save the labor of removing the synthetic resin frame at the time of recycling and to easily collect the synthetic resin frame.

[Brief description of drawings]

FIG. 1 is a plan view showing a can lid according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a part of the can lid of FIG. 1 by breaking it.

3 (a) is an explanatory view showing an enlarged main part of FIG.
(B) is explanatory drawing which shows the other example of (a).

FIG. 4 is an explanatory diagram showing another example of FIG. 2.

5 (a) is an explanatory view showing an enlarged main part of FIG. 4,
(B) is explanatory drawing which shows the other example of (a).

FIG. 6 is an explanatory diagram showing another example of FIG. 2.

FIG. 7 is an explanatory diagram showing another example of FIG. 6.

FIG. 8 is an explanatory diagram showing another example of FIG. 6.

9 is an explanatory diagram showing another example of FIG. 6. FIG.

FIG. 10 is an explanatory diagram illustrating a part of the configuration and operation of FIG. 6.

11 is an explanatory diagram showing still another example of FIG. 2. FIG.

FIG. 12 is an explanatory sectional view showing a conventional can lid.

FIG. 13 is an explanatory sectional view showing another conventional can lid.

[Explanation of symbols]

X ... Can container, 1, 14 ... Can lid, 2 ... Lid frame body, 3 ... Top sealing material, 4 ... Winding part, 5 ... Panel part, 6 ... Opening part, 7 ...
Folded portion, 8 ... Coating film, 10 ... Tab, 11 ... Convex portion, 12,
13 ... break, 15 ... step.

Claims (6)

[Claims] 1. A metal lid frame body having an outer peripheral edge portion with a winding portion for tightening around a can container, and an opening portion formed in a panel portion surrounded by the outer peripheral edge portion, and an outer peripheral edge portion. A stripping opening tab is provided, and a coating layer is provided on at least the lower surface side.
A coating film provided with a top sealing material for opening made of a metal foil for sealing the opening, the lower surface side of the sealing material being applied with a paint on at least the upper surface of the panel portion of the lid frame. A can lid formed to be peelably adhered to the opening portion, the folding edge portion being formed by folding back the peripheral edge of the opening portion is provided on the entire circumference of the opening portion, and the folding portion forms a peripheral portion of the opening portion. By folding back, the edge is wound up inside the folded portion, and the portion of the folded portion that overlaps with the panel portion is adhered through the coating film so that the edge is enclosed inside the folded portion. A can lid characterized in that. 2. The coating material is applied to a portion of the upper surface of the panel portion where the ceiling sealing material is adhered and a portion where the folded portion is polymerized and adhered to the panel portion. The can lid according to claim 1. 3. The panel portion of the lid frame body is provided with an annular convex portion projecting upward along the opening portion, and the top sealing material is releasably adhered to the top portion of the convex portion. The can lid according to claim 1 or 2, wherein 4. The can lid according to claim 3, wherein the convex portion is formed by projecting the folded-back portion upward from a panel portion of the lid frame body. 5. A cut portion is formed in the coating film along both side edges of a top portion of the convex portion, and the ceiling sealing material is adhered to the coating film between the cut portions. The can lid according to claim 3 or 4, wherein: 6. The panel portion of the lid frame body is provided with a step so that the folded-back portion is located below a surface to which the ceiling sealing material is adhered. The can lid described in 2.