JPS63585Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an easy-open metal lid, and more particularly to an easy-open metal lid that is opened by tearing a weakened portion that defines an opening.

Metal lids of the type that are opened by pulling up the conventional knob tab and tearing off the weakened part that defines the opening usually have a protruding part called a rivet part on the metal lid, and the rivet part is made of metal. It had a pick tab attached to it. The tab has a relatively complex structure and must be relatively thick (usually 0.3 mm) in order to form the rivet without breaking.
(above)) This type of easy-open metal lid requires a metal lid base plate, and therefore has the problem of high cost.

The present invention aims to solve the problems of the prior art described above.

In order to achieve the above object, the present invention forms a metal lid with a main layer, an outer layer, and an inner layer, and a weakened part is formed in the panel part of the metal lid to define an opening, and the outer and inner surfaces are formed with weakened parts that define the opening. A knob tab and an engaging portion made of thermoplastic plastic are integrally molded through a bridge portion passing through a small hole provided in the weakened portion, and the engaging portion is formed as described above. The outer layer of the metal lid is formed of a material that does not thermally fuse with the thermoplastic plastic forming the engaging portion, and the inner layer is formed of a material that does not thermally fuse with the thermoplastic plastic that forms the engaging portion. The present invention provides an easy-open metal lid characterized in that it is made of a material that can be fused.

The present invention will be described below with reference to the drawings which are examples.

In FIGS. 1, 2, and 3, reference numeral 1 denotes an easy-open metal lid (hereinafter referred to as the lid), which includes a panel portion 2, a rising portion 3 from the periphery of the panel portion 2 (so-called chalk wall), and a curl. having part 4;
The container body is configured to be sealed by forming a double seam portion by the curl portion 4 and a flange portion (not shown) of the container body. Lid 1
As shown in FIG. 3, the main layer 1a is made of a metal plate (for example, tinned steel plate, stain-free steel, aluminum alloy plate, etc.), the outer layer 1b is made of a baked coating film, a printed film, etc., and a baked coating film. The inner layer 1c is made of a thermoplastic plastic film or the like which is bonded or heat-sealed to the main layer 1a via an adhesive layer (not shown). The panel portion 2 is formed with a weakened portion 6 (score portion in the figure) that defines an opening 5 (see FIG. 4). 7 is a ring-shaped knob tab, and 8 is a knob-shaped engaging portion, which is attached to the outer surface and inner surface of the lid 1 through a bridge portion 10 passing through a small hole 9 provided in the lid 1, respectively. It is integrally molded from thermoplastic plastic. Examples of thermoplastic plastics used include polyethylene terephthalate, nylon, polypropylene, and polyethylene.

The small hole 9 and the engaging portion 8 need to be formed to be located inside the weakened portion 6 so that the opening can be made by pulling up the knob tab 7. Note that in order to ensure sealing performance, it is desirable that the inner layer 1c and the engaging portion 8 be heat-sealed to form a heat-sealed portion 11. Therefore, the inner layer 1c has the engaging portion 8
Preferably, the material is heat-sealable to the thermoplastic plastic used to form the material. Examples of such combinations of materials are as follows.

(B) Inner layer 1c: Polyester-ether film or modified polyester film Engagement part 8: Polyethylene terephthalate (B) Inner layer 1c: Epoxy-phenol baking coating Engagement part 8: Nylon 12 (C) Inner layer 1c: Polypropylene film, or acid-modified polypropylene film Engagement part 8: polypropylene (d) Inner layer 1c: polyethylene film, ethylene-vinyl acetate copolymer film, or acid-modified polyethylene film Engagement part 8: polyethylene Also allows the knob 7 to be pulled up Therefore, the outer layer 1b needs to be made of a material that does not heat-seal with the thermoplastic plastic.

When the gripping tab 7 of the lid 1 is grasped with fingers and pulled up, and pulled in the direction of the arrow as shown in FIG. 4, the weakened portion 6 is torn and the opening 5 is formed.

The lid 1 is manufactured, for example, as follows.

After forming a small hole 9 in a predetermined position of the lid 1 before forming the tab 7 and the engaging part 8, the outer and inner surfaces thereof are molded into an injection mold 13 and 14. Mold 13
and 14 are formed with holes having shapes corresponding to the knob tabs 7 and the engaging portions 8, respectively. When the hot melt thermoplastic is injected into the hole through the nozzle section 15, the tab 7, the bridge section 1
0 and an engaging portion 8 are formed. At this time, if the inner layer 1c is made of a material that can be heat-sealed to the thermoplastic plastic, a heat-sealed portion 11 is formed. Note that since the outer layer 1b is made of a material that is not thermally bonded to the thermoplastic plastic, the tab 7 and the outer layer 1b are easily separated after solidification.

The easy-open metal lid of the present invention is not limited to the above embodiments; for example, the engaging portion 8 may extend along the weakened portion 6 throughout the interior thereof. It is also possible that the metal plate is a relatively thin material, e.g.
If it is made of an aluminum plate of 100μm or less,
By providing a reinforcing portion adjacent to and outside the weakened portion 6 (on the inner surface of the lid), which is formed by simultaneous injection molding with the engaging portion, the deflection of the lid during opening is reduced, and the force required for opening is reduced. can be reduced.
Furthermore, it may be a so-called full-open type easy-open metal lid in which a weakened portion is formed along the periphery of the panel portion. Further, when the metal plate is made of a relatively corrosion-resistant material such as aluminum or tin-plated steel plate, it is not necessarily necessary to provide the outer layer 1b. On the other hand, if the metal plate is made of a relatively thin material, the outer layer 1
b may be formed of a reinforcing plastic film (with gravure printing applied to the inner surface if necessary). Alternatively, the lid may have a peripheral edge of a type that is joined to the container body by heat sealing.

The easy-open metal lid of the present invention allows the knob tab and the engaging part to be connected through a bridge part that passes through a small hole in the lid.
Since it is integrally molded from thermoplastic plastic, it has a simple structure and is easy to manufacture, and since it can be made from a relatively thin metal plate, it has the advantage of being low cost. Furthermore, since the inner layer of the metal lid is made of a material that can be heat-sealed to the thermoplastic plastic that forms the engagement part, the inner layer and the engagement part can be heat-sealed to form a heat-sealed part. It has the advantage of being able to ensure sealing performance. Furthermore, since the outer layer of the metal lid is made of a material that does not heat-seal with the thermoplastic, the tab can be easily pulled up, meaning that the tab and the outer layer can be easily separated after fixation. I can do it. In addition, by tearing the weakened part to open the opening and by ensuring that the inner layer of the metal lid and the engaging part are firmly adhered,
This has the advantage that the opening can be made extremely easily and reliably.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an easy-open metal lid that is an embodiment of the present invention, Fig. 2 is a longitudinal sectional view taken along the - line in Fig. 1, and Fig. 3 is an enlarged longitudinal sectional view of part A in Fig. 2. Figure 4 is a plan view showing the state in which the easy-open metal lid shown in Figure 1 is being opened, and Figure 5 is a main part of an example of a mold used to manufacture the easy-open metal lid shown in Figure 1. FIG. 1...Easy open metal lid, 5...Opening,
6... Weakening part, 7... Tab for knob, 8... Engaging part, 9... Small hole, 10... Bridge part.

Claims (1)

[Scope of utility model registration request] The panel portion 2 of the metal lid 1, which is composed of the main layer 1a, the outer layer 1b, and the inner layer 1c, is formed with a weakened portion 6 that partitions the opening 5, and the weakened portion 6 is provided on the outer and inner surfaces, respectively. A knob tab 7 and an engaging portion 8 made of thermoplastic plastic are integrally molded through a bridge portion 10 passing through a small hole 9.
are respectively formed, and the engaging portion 8 is provided so as to be located inside the weakening portion 6, and the outer layer 1b of the metal lid 1 is made of thermoplastic plastic forming the engaging portion 8. An easy-open metal lid characterized in that the inner layer 1c is made of a material that is heat-sealable to the thermoplastic plastic.