JPS5931545Y2 - Easy-to-open container lid with heat seal - Google Patents

Description

[Detailed description of the invention] The present invention relates to an easy-to-open container lid by heat sealing.
More specifically, the present invention relates to an easy-to-open container lid that has a combination of easy-to-open performance and reliable sealing, and also has excellent appearance characteristics of the spout or drinking spout.

Conventionally, it is widely known that a lid member such as a wire end is provided with an opening to serve as a spout or drinking spout in advance, and an easily peelable opening piece is adhered to cover this opening. Adhesion to the lid member is performed using a pressure sensitive adhesive or heat sealing using a thermoadhesive resin.

However, the former pressure-sensitive adhesive method has the problem that it is difficult to guarantee that individual cans have not been opened, since re-adhesion is possible using pressure after opening. This method has a problem in that it is difficult to strike a balance between ease of opening and reliability of sealing.

That is, if the heat sealing strength is high, the sealing reliability is improved, but on the other hand, it is difficult to open the package by peeling off the opening piece.

On the other hand, if the heat-sealing strength is weakened, it will be easier to open the package by peeling it off, but the sealing of the heat-sealed portion will likely break due to shocks such as vibrations and drops during transportation, that is, leakage will easily occur.

In order to adjust the heat seal strength to a region between these areas, ingredients that weaken the heat seal strength are added to the heat seal resin, but there is variation in the heat seal strength for each lid. , it is difficult to obtain reliable and reproducible results.

In addition, with the former pressure-sensitive adhesive method, even if the opening piece is peeled off with the area around the opening that serves as the spout or drinking spout clean, with the latter heat-sealing method, the opening or the surrounding area may break. There is a problem in that resin pieces left behind in the form of feathers spoil the appearance.

The present invention relates to the improvement of the latter type of easy-to-open containers, which are both easy-to-open and reliable in sealing, and which have an opening that serves as a spout or drinking spout even after the opening piece is peeled off. The purpose of the present invention is to provide an easily openable heat-sealed container that is aesthetically pleasing.

According to the present invention, the wire end member includes a pre-formed opening and an easily peelable opening piece provided on the outside of the wire end member so as to cover the opening and come into close contact with the periphery of the opening. In the easy-to-open container lid, the wire end member includes a heat-adhesive thermoplastic resin layer applied in advance to the opening periphery of the side on which the tear-off piece is attached, and the heat-adhesive thermoplastic resin layer The plastic resin layer is made of a film having a concentric outer ring that is substantially similar to the opening of the wire end member and has a slightly larger size, and an inner ring that approximately corresponds to the opening of the wire end member, The wire end member and the unsealing piece are heat-sealed via this thermoplastic resin film layer, and a gap is formed between the unsealing piece and the wire end member to act as a guide for starting peeling at the time of opening. A container lid is provided.

The present invention will be described in detail below based on the accompanying drawings.

As shown in FIGS. 1 and 2, the easy-to-open container lid of the present invention consists of a lid member (line end member) generally designated by 1 and an opening piece generally designated by 2.

The wire end member 1 is cut from a rigid material, for example a painted metal plate, and has a preformed closure 3 at an arbitrary position in its center for access to the contents.

A flange 4 is provided around the periphery of the wire end member 1 to perform double seaming between the wire end member 1 and a jumper (not shown).

The opening piece 2 is provided on the outside of the wire end member 1 so as to cover the aforementioned opening 3 and come into close contact with the periphery of the opening.

According to the present invention, a heat-adhesive thermoplastic resin film layer (hereinafter simply referred to as a thermoplastic resin layer) 5 is provided around the opening of the wire end member 1 on the side where the opening piece 2 is applied. The wire end member 1 and the opening piece 2 are bonded to each other via the plastic resin layer 5 using a human seal.

As shown in FIG. 3, this thermoplastic resin layer 5 has an outer opening 6 that is almost similar in shape to the opening 3 of the wire end member 1 and has a slightly larger size than the opening 3 according to the present invention. This is one important feature of

That is, the thermoplastic resin layer 5 naturally covers the opening 3 of the wire end member 1.
The wire end member 1 and the opening piece 2 have an opening 3' corresponding to the opening 3', but since the ring 7 of this opening and the outer ring 6 have substantially similar shapes and are concentric, the wire end member 1 and the opening piece 2 are They are joined by heat sealing through the resin layer 5, which always has a constant width at the periphery, thereby making it possible to form a reliable seal, and the heat sealing width at the periphery of the opening is almost constant and relatively narrow. width, and a gap 8 is inevitably formed between the opening piece 2 and the wire end member 1,
This gap acts as a guide (notch) for starting peeling when unsealing, so even if the opening piece 2 and the wire end member 1 are joined with a considerably high heat-sealing strength, peeling will not occur. The package can be opened easily.

In addition, the outer ring of the thermoplastic resin layer has a similar shape to the opening and is slightly larger in size, so even after peeling off the opening piece, the appearance of the area around the opening, which serves as the pouring spout or drinking spout, cannot be seen. There is little tendency for damage, and due to the above-mentioned peeling initiation guidance effect, a clean peeling surface is formed when the package is opened, resulting in an even better appearance around the opening after peeling.

Further, according to the present invention, the outer ring 6 of the thermoplastic resin layer 5 has a similar shape to the openings 3 to 3' and is slightly larger in size, so that even after the opening piece 2 is peeled off, As shown in Figure 3, there is little tendency to spoil the appearance of the area around the opening that serves as the spout or drinking spout. It has an excellent appearance.

In the present invention, the loop of the opening 3 of the wire end member 1 and the loop of the opening 3' of the thermoplastic resin layer 5 may be exactly the same as shown in FIGS. As shown in FIG. 4, the thermoplastic resin layer 5 may protrude inward from the opening of the wire end member 1, and may closely adhere to and cover the cut edge 9 of the opening 3.

In the present invention, the opening 3 of the wire end member can take any shape such as a circle, ellipse, oval, or raindrop shape, and the resin layer 5 also has a similar shape accordingly. .

A film is used as the thermoplastic resin layer 5.

Suitable examples of such films are those having a melting point or softening point of 70 to 260°C and exhibiting thermal adhesion to metals or substrates, such as various polyesters or copolyesters, polyamides, olefin-based films, etc. These are films of resins, acid- or acid-anhydride-modified olefin resins, ethylene-vinyl acetate copolymers, and the like.

Termination members may be made of light metal plates such as aluminum, tinplate, treated steel plates such as aluminum-plated steel plates, chrome-plated steel plates, electrolytic chromic acid-treated steel plates, etc., in an unpainted state, or with thermosetting materials known per se. Resin paint and/
Or used coated with thermoplastic resin paint.

The opening piece is made of a material that is flexible and has gas barrier properties, such as metal foil such as aluminum foil, tin plate, iron foil, steel foil, biaxially oriented polyester film, biaxially oriented polyamide (nylon), etc. A film, a biaxially oriented polypropylene film, or a laminate thereof is used.

The above-mentioned heat-adhesive thermoplastic resin layer may be provided on the wire end member side surface of these opening pieces.

When manufacturing the easy-to-open container lid of the present invention, the outer surface of the termination member 1 is heat-bonded and punched into a shape that is almost similar to the opening to be punched and is slightly larger in size than the opening to be punched. The adhesive film 5 is applied and thermally bonded.

Openings 3 and 3' concentric with the film 5 are provided by punching in the area where the film 5 is applied.

Next, apply the opening piece 2 to the film 5, and
is adhered to the termination member 1 around the openings 3, 3' by heat sealing.

Thermal bonding or heat sealing is performed by high frequency induction heating, a heat seal bar, ultrasonic irradiation, or the like.

In the container lid having the shape shown in FIG. 4, the film 5 is thermally bonded to the termination member 1 in which an opening 3 is provided in advance, and then the thermally bonded film 5 has an opening 3' smaller in size than the opening 3.
The film portion protruding inward from the opening 3 is pushed into the opening 3 in a molten state so as to be brought into close contact with the opening cut edge 9, and the same operation is performed thereafter.

In the present invention, the thickness of the film 5 is 20 to 200 μm.
The width of the film 5 around the opening is preferably between 0.3 and 5 mm in relation to the above object of the present invention.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the container lid of the present invention, and Figure 2 is a perspective view of the container lid of the present invention.
FIG. 3 is an enlarged top view showing the opening piece removed from the container lid of FIG. 1, and FIG. 4 is an enlarged sectional view taken along line II-I in the figure. It is an enlarged sectional view showing an aspect. River fish numbers 1 is the termination member, 2 is the opening piece, 3 and 3' are the openings, 4 is the flange, 5 is the heat-adhesive thermoplastic resin layer, 6 is the outer ring, 7 is the opening ring , 8 indicates the gap at the beginning of peeling.

Claims (1)

[Claims for Utility Model Registration] An edge member having a pre-formed opening, and an easily peelable opening piece provided on the outside of the edge member so as to cover the opening and come into close contact with the periphery of the opening. In the easy-to-open container lid, the edge member has a part around the opening on the side where the opening piece is applied,
A heat-adhesive thermoplastic resin layer is preapplied prior to adhesion of the opening piece, and the thermoplastic resin layer has a concentric outer ring approximately similar in shape to the opening in the edge member and having a slightly larger size. The edge member and the opening piece are heat-sheeted through this thermoplastic resin film layer, and the opening piece and the opening piece are heat-sheeted through this thermoplastic resin film layer. A container lid characterized in that a gap is formed between the end member and the lid to act as a guide for starting peeling when the lid is opened.