JPH06247447A - Pull opening can-top and can - Google Patents

Abstract

PURPOSE: To provide a pull-open can and its lid without such shortage as breaking of pull-ring or falling of metal debris into the can. CONSTITUTION: A closure 3 of aluminum foil 3A thinly coated with resin layers 3B and 3C on its upper and lower surfaces is connected with a metal frame 4 by molding a plastic (PE) coated layer 5 on the closure 3 and frame 4 in a body, and a pull-ring 8 and indented line for tearing off are provided on the coated layer 5 when molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can lid for canning food, and more particularly to a structure having a polyethylene (PE) injection coating layer integrally formed with a pull ring on the surface of the lid. The present invention relates to a safe, convenient and easy-to-open food can lid (hereinafter referred to as "pull open can lid").

[0002]

2. Description of the Related Art Conventionally, most commercially available lids of pull-open type food cans are made by attaching a pull ring to one aluminum lid and pulling the pull ring strongly to remove the aluminum lid. It is designed to be torn and opened. Such a conventional pull-open type food can lid has a single aluminum lid structure and therefore has a relatively large thickness, and there are roughly two types of pull ring configurations.

One of them is constructed such that a pull ring is fixed to the inside of the tearing concave line formed on the lid, and the pulling ring is strongly pulled vertically upward to tear the lid along the tearing concave line. .

Another structure is a lever type, in which when the pull ring is pulled upward, the other end of the can is pressed downward to open the lid opening, and then continuously pulled upward, and then the aluminum lid is looped. It is configured to tear along the tearing concave line.

[0005]

However, the above-described pull-open can lid has the following drawbacks.

(1) When tearing the lid, a small amount of aluminum chips fall into the food in the can. Even if the amount of this aluminum chip is very small, it is dangerous and it is not preferable to mix it with food.

(2) The perimeter of the torn aluminum lid is very sharp and easily injures the user's finger.

(3) The aluminum lid has a single silver-white color and lacks aesthetic sense. Moreover, it is difficult to color the tin according to the color of the can, resulting in high cost.

(4) The lid made of aluminum requires a relatively large force to tear, and the pulling ring must be made of a material that is fairly strong. The aluminum lid is made of a material different from that of the material. However, since it has to be tacked to the lid and cannot be molded at once, the manufacturing cost becomes high.

(5) When opening the can, the can lid is opened by first prying the pull ring with the claws and then making a hole around the rivet contact of the pull ring and the lid, and then pulling vigorously. However, at times, the pull ring may break first or the tack contact may come off, and when that happens, the lid cannot be opened.

One of the objects of the present invention is to solve the above-mentioned problems, and when tearing and opening the lid of a food can, chips such as iron and aluminum do not bring into the food in the can. To provide a lid.

Another object of the present invention is to provide a safe and easy-to-use pull-open can lid which does not damage the fingers when tearing and opening the lid.

Still another object of the present invention is to provide a pull-open can lid in which the pull ring and the lid are integrally made of the same elastic polyethylene material so that the pull ring does not break first. is there.

Another object of the present invention is to provide a pull-open can lid whose surface can be easily colored according to the color of the can body.

[0015]

A pull-open can lid of the present invention comprises an annular inner flange having a hook-shaped curling portion formed on the inner periphery thereof and an outer flange extending to the outer peripheral side of the inner flange via a step portion. It is composed of an annular frame made of a metal plate having and an aluminum foil with a resin film formed on the upper and lower surfaces, respectively, and seals the central open part of the frame and adheres to the lower surfaces of the inner and outer flanges of the annular frame. And the upper surface of the lid and the upper surface of the inner flange of the frame are formed by injection molding, and a part of the plastic melts into the hook-shaped curling portion of the frame and is attached to the lid and A cover layer formed by adhering to the upper surface and joining the lid to the frame and forming a tear concave line, and one end of the tear concave line of the cover layer is integrally molded with the cover layer using the same plastic material as the cover layer. With a pull ring It is provided.

Preferably, a recess is formed on the lower surface of the outer flange of the frame, and synthetic rubber as a seal member is applied to the recess.

Further, it is preferable that a color is applied to the outer circumference, and coloring is performed in accordance with this color.

[0018]

According to the present invention, there is provided a pull-open can lid in which an aluminum foil and a tin plate lid frame are joined by injection molding a polyethylene coating layer, and a pull ring is integrally formed with the polyethylene coating layer. can do.

Further, according to the present invention, there is provided a pull-open can lid having a coating layer formed by injection-molding polyethylene on the surface of an aluminum foil and combining the coating layer with the frame of the can lid. You can

In addition to the features and advantages described above, the pull-open can lid of the present invention covers the peripheral recess of the frame with a plastic material so that the joint between the frame and the can is hermetically sealed. As a result, it is possible to completely prevent the infiltration of oxygen and water, and it is possible to preserve the food in the can for three years without degrading it, which has the effect of further ensuring quality assurance.

[0021]

EXAMPLE As shown in FIG. 2, the pull-open can lid of the present invention is composed of the following three members, that is, the lid body 3, the frame 4 and the plastic coating layer 5.

(1) Lid 3 This lid 3 has a three-layer structure in which resin plates 3B and 3C (thickness of about 30 to 40 μm) are coated on the upper and lower surfaces of an aluminum foil 3A formed in a dish shape. Made of laminated sheet, aluminum foil 3A
A peripheral portion of is formed with a step S to form an outer flange 3D.

(2) Frame 4 This frame 4 is formed by punching a tin-plated iron plate (tin plate) into an annular shape, has a space portion 6, and has a step portion H with an outer flange F1 and an inner flange F2. Formed and outer flange F
A concave portion 13 is formed at 1 and a hook-shaped curling portion 7 is formed on the inner flange F2 by bending outward upward along a line. A synthetic rubber 14 for sealing is applied to the recess 13.

The outer flange 3D of the lid 3 is in close contact with the recess 13 in the step H and the recess 13, and the outer peripheral portion of the main body of the cover 3 is in close contact with the lower surface of the inner flange F2 of the frame 4. Is shaped to gain.

(3) Plastic coating layer 5 This coating body is insert-molded (INSERT) on the upper surface of the frame 4 with the lid body 3 being in contact with the lower surface of the frame 4.
It is formed by molding (MOLDING). Although shown in an exploded view in the drawing, this coating layer is not formed by itself, but is formed by putting the lid body 3 and the frame 4 in a molding die and integrally molding them. Then, the coating layer 5 is provided with a tear concave line, and a tear ring is formed integrally with the cover body at the starting point of the tear concave line.

Next, the structure of the pull-open can lid of the present invention will be described in detail. FIG. 1 shows an embodiment of the can of the present invention. Referring to FIG. 1, this can has a pull-open can lid 2
Are joined to the upper end of the can body 1 by caulking.

FIG. 2 is an exploded view of three main parts of the pull-open can lid of one embodiment of the present invention. Referring to FIG. 2, 3 is resin layers 3B and 3C on the upper and lower surfaces of the aluminum foil 3A.
3 layered lid with thin coating, 4 is a round frame, 5 is a plastic coating layer formed integrally by injection molding, 6 is a hollow part of the round frame, F2 is an inner flange, F1 is an outer flange ,
H is a stepped portion, 7 is a hook-shaped curling portion formed by bending the inner peripheral edge of the inner flange F2 of the frame 4 upward and outward, and 8 is a pull ring formed integrally on the plastic coating layer 5. ,
Reference numeral 9 denotes a tearing concave line extending from the pulling ring 8 along the circumference of the coating layer on the plastic coating layer 5.

In the figure, the plastic coating layer 5 is formed integrally with the lid 3, and is not separately formed separately. The exploded view in this figure is to show the structure of each layer, and it shows that the three layers were manufactured separately and then combined together. No (the lid 3 and the frame 4 are previously independently manufactured separately).

The manufacture of the pull-open can lid of this embodiment will be described in the order of FIGS. First, in FIG. 3A, 11 is a tin-plated iron plate, which is punched by a punch press to form a dish-shaped can lid 12. Only half of the can lid 12 is shown in the figure, and the shape of the cross section is shown so that it is easy to understand.

In FIG. 3B, a stepped portion H is formed on the peripheral edge of the can lid 12 to produce an outer flange having a substantially Z shape, and a concave portion 13 is formed on the outer flange F1 to form a seal. Synthetic rubber 14 is applied as a material. Note that FIG.
The can lid 12 in FIGS. 3A and 3B is displayed with the vertical direction reversed.

This sealing material 14 is used when the lid 3 and the frame 4 are combined and molded integrally with the plastic coating layer 5.
When attaching the outer flange 3D of the lid 3 to the recess 13 of the outer flange F1 of the frame 4 and attaching the lid to the can,
As a seal, it has the effect of keeping the caulked part airtight.

FIG. 3C shows the can lid 12 shown in FIG. 3B.
The hollow portion 6 is formed by an annular frame formed by cutting off the central portion of the.

FIG. 3 (d) is a circular frame shown in FIG. 3 (c) in which a step portion H is formed on the outer periphery of an annular inner flange F2.
An outer flange F1 is formed further outside thereof, and a hook-shaped curling portion 7 is formed on the inner peripheral edge of the inner flange F2.

FIG. 4 is a view showing the shape of the lid body 3 having a three-layered structure. It has film layers 3B and 3C formed by coating a resin (30 to 40 μm) on the upper and lower surfaces of the aluminum foil layer 3A, and the peripheral portion. Forms the outer flange 3D through the stepped portion S, and the frame 4
Is formed so as to engage with the lower surface of the outer flange F1.

FIG. 5A is a view showing a state in which the frame 4 and the lid 3 are overlapped with each other, and the outer peripheral edge 3D of the lid 3 is engaged with the lower surface recess 13 of the outer flange F1 of the frame 4. This is put in an injection molding die (not shown), and plastic such as PE is molded and injected to form the coating layer 5 on the upper surface of the frame 4. At this time, the PE melt injected into the injection mold is melted and attached to the hook-shaped curling portion 7 and is also welded to the entire upper surface of the lid 3 to form the lid 3 and the frame 4. Make the adhesion of the more complete. Further, the injection mold is provided with a projection for forming the tearing concave line 9 and a cavity for forming a tearing ring, and the coating layer 5 having the tearing concave line 9 (thickness of about 0.5) is formed.
(-1.5 mm) is formed, and at the same time, the pulling ring 8 is formed integrally with the coating layer 5.

FIG. 6 is a sectional view of an example of the pull-open can lid of the present invention. 3B, 3C in the enlarged portion in the figure
Is a resin film on the upper and lower two layers of the lid 3, and 3A is an aluminum foil layer, 5
Is a coating layer formed by injection molding.

FIG. 7 is a diagram showing an example in which the pull-open can lid of the present invention is used on a food can. Referring to the figure, when you open the can lid, pull the can directly upward with your fingers,
The coating layer 5 and the lid body 3 are torn along the tearing concave lines from the ends of the respective tearing concave lines, and the lid body 3 can be easily opened. Then, no chips are generated when the aluminum foil is torn, and even if chips are generated, they are removed in a state where they are attached to the plastic of the coating layer, so that they do not mix with food.

[0038]

INDUSTRIAL APPLICABILITY The pull-open can lid of the present invention allows the can lid to be opened very easily, does not hurt a finger, and scraps such as iron and aluminum may fall into food in the can. Since the pull ring integrally molded with plastic and the lid surface are made of the same material, mass production is possible, which leads to cost reduction in processing and manufacturing, and the pull ring can be easily cut or removed. There is no. Furthermore, the surface of the plastic can lid can be colored in various ways according to the color of the can body, which enhances the aesthetic effect and also has the effect of keeping the joint with the can body highly airtight. , With novelty, inventive step and practicality.

[Brief description of drawings]

FIG. 1 is a view showing a state where a pull-open can lid of one embodiment of the present invention is used for a food can.

FIG. 2 is an exploded view of three parts of the pull-open can lid of one embodiment of the present invention.

FIG. 3 is a diagram showing a manufacturing process of a frame used for the pull-open can lid of the present invention.

FIG. 4 is a lid body 3 used in the pull-open can lid of the present invention.
It is a figure which shows the cross section of.

5 (a) is a view showing a cross section of the frame of FIG. 3 (d) and the lid 3 of FIG. 4 overlapped with each other, and FIG. 5 (b) is a cross-sectional view of FIG. It is the figure which completed the pull-open can lid formed by forming the cover body 3 and the frame 4 shown.

FIG. 6 is a view showing a cross section of an embodiment of the pull-open can lid of the present invention.

FIG. 7 is a view showing a state in which the present invention is used on a food can, where the pull ring is torn when the lid is opened, and the tear ring is torn from the end of the concave line, and the lid is pulled apart along the line along the line. FIG.

[Explanation of symbols]

 2 Pull open can lid 3 Lid body 4 Frame 5 Plastic coating layer 7 Curling part 8 Pull ring 9 Tear concave line In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. An annular frame made of a metal plate having an annular inner flange having a hook-shaped curling portion formed on its inner periphery and an outer flange extending to the outer peripheral side of the inner flange via a step portion, A lid body made of aluminum foil having a resin film formed on each of an upper surface and a lower surface, which seals a central opening portion of the frame and is closely attached to respective lower surfaces of an inner flange and an outer flange of the annular frame; The upper surface of the body and the upper surface of the inner flange of the frame are formed by injection molding plastic, and a part of the plastic melts into the hook-shaped curling portion of the frame and is attached to the upper surface of the lid body. A cover layer formed by adhering the lid body to the frame and forming a tear concave line, and an end portion of the tear concave line of the cover layer, which is made of the same material as the cover layer and is integrally formed with the cover layer. Molded into A pull-open can lid that includes a pull ring. 2. The pull-open can lid according to claim 1, wherein a recess is formed on the lower surface of the outer flange of the frame, and the recess is coated with synthetic rubber as a seal member. 3. A can with a pull-open can lid according to claim 1, wherein the outer circumference is colored and is colored according to the color.