JPS6126206Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to an easy-to-open container lid with a liner.

(Prior art) Conventionally, in the field of container lids such as bottle lids, a score (weakened Widely used devices have a peel-off section defined by a line or a cut line, and the score is sheared by pulling a grip provided at the opening start section with a finger to open the package.

Naturally, in this type of easy-open container lid, it is necessary to provide a sealing liner made of resin for sealing with the bottle opening.

Conventionally, various proposals have been made for this type of container lid in order to improve ease of opening without impairing sealing performance.

For example, in Japanese Patent Publication No. 52-11633, a sealing liner is provided inside the shell in a non-adhesive state over a region of more than half the length from the opening start part where a score is provided, and the sealing liner is provided inside the shell in the remaining region. It is disclosed that it can be adhered to.

(Problems to be Solved) However, in the method of bonding the liner and shell as disclosed in the above publication, the liner is not bonded at the center, so the liner forming resin is stamped into the desired shape. It becomes difficult to form a sealing liner.

In other words, when molding resin within the shell, a lump of molten or sol-like resin is supplied to the center of the shell, but these resin lumps do not adhere to the inside of the shell. However, the known method in which the liner is not glued in the center has the disadvantage that lumps of the applied resin fly out of the shell due to centrifugal force or the like.

Therefore, the present invention provides a container lid with an easy-to-open liner, which can be molded into a liner shape by molding resin inside the shell, and which can be easily opened by peeling off the section divided by scores. This is what we provide.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a liner on the inner surface of the container lid shell through multiple layers of coating, and (a) The coating film is an adhesive coating film that has strong adhesion to the liner; This method employs the following method: providing an easily removable base coating between the adhesive coating and the adhesive coating.

(Function) According to the present invention, since the liner is provided on an adhesive coating film, there is no problem that lumps of liner forming resin may fly out of the shell due to centrifugal force etc. during liner molding operation. This effectively prevents liner molding by embossing the resin inside the shell.

In addition, since a base coating film that is easily peeled off from the adhesive coating is provided on the peeling start side of the peeling part, the adhesive coating remains on the liner side that is peeled off, resulting in a lower score. Opening by tearing is extremely easy.

(Example) The present invention will be described based on a specific example shown in the accompanying drawings.

In FIGS. 1 and 2 showing an easy-to-open container lid with a liner according to the present invention, this container lid includes a container lid shell 1 made of a metal material such as aluminum, tinplate, stain-free steel, or other surface-treated steel plate. It consists of a sealing liner 2 placed inside. The shell body 1 is connected to the top plate part 3,
It consists of a skirt portion 4 hanging down from its periphery. An opening tab 5 is provided integrally with this skirt portion 4 and protruding outward, and a grip portion 6 is provided at the tip of this opening tab 5. Two scores (weakening lines) 8, 8 extend across the skirt portion 4 from the base 7 of the opening tab 5 on the skirt portion 4, and furthermore, these scores are connected to the outer periphery of the top plate portion 3 or the top plate portion 3. It extends along the boundary with the skirt portion 4.

The inner surface of this shell body 1 is coated with a coating film 9, which will be described in detail later.
10 is applied, and a sealing liner 2 is provided over the entire surface of the top plate portion 3 of the shell body 1 via these coating films 9 and 10.

In the present invention, the sealing liner 2 is made by supplying a melt of olefin resin such as low-density polyethylene, crystalline ethylene-propylene copolymer, or soft vinyl chloride resin into the shell body 1, and then inserting a cooled punch (Fig. (not shown), and consists of at least one thick-walled sealing ring 11 to be mated with the container opening and a thin-walled portion 12 located on the inner peripheral side of the sealing ring. . Liner 2 is a block of plastisol such as vinyl chloride resin,
It can also be formed by pressing with a heated punch to gel it.

In the specific example shown in FIG. 2, FIG. 3 which is an enlarged sectional view thereof, and FIG. 4 which is an enlarged plan view thereof,
A first coating film 9 exhibiting adhesiveness to the shell is provided on the shell 1 so as to cover at least the peeling side 13 of the peeling portion divided by scores 8 and 8. A second coating film 10 is provided on the first coating film 9 so as to cover the entire surface of the shell body 1.

The second coating film 10 exhibits strong adhesion to the liner 2, but the second coating film 10 and the first coating film 9 are selected to be non-adhesive or weakly adhesive.
The second coating film 10 also exhibits strong adhesion to the shell, and is adhered to the shell at a position other than the position of the first coating film 9 described above. The first coating 9 may be applied directly onto the metal material of the shell, but it may also be applied over an undercoat 14 on the shell, as shown in detail in FIG. This undercoat 14 may be a conventional undercoat coating.

In this specific example, as shown in FIG.
The coating film 9 has a circular arc 16 and two sides 15, 15 of a triangle whose apex is located near the center and forms an acute angle α, and the circular arc 15, 15,
The region surrounded by 16 is a non-adhesive or weakly adhesive region A, and the rest is a stronger adhesive region B.
That is, near the center, the coating film is cut in a V-shape, and the adhesive area B is wedge-shaped.
By gradually increasing the width in the peeling direction, the peel strength of the peeled portion gradually increases in the peeling direction.

The combination of coating films is appropriately selected depending on the type of resin of the liner. In the embodiment shown in FIGS. 2-4, the liner 2 is an olefin resin, and the liner 2 is an olefin resin.
The coating film 10 is formed from an epoxy paint containing oxidized polyethylene or acid-modified olefin resin,
The first coating film 9 is formed from a hydrocarbon resin or natural resin paint. In this specific example, the second coating 10 has a high modulus of elasticity and is tough, while the first coating 9 has brittle properties.

According to the present invention, although the sealing liner 2 is adhered to the central part of the shell 1 due to the above-described structure, the sealing liner 2 can be opened by peeling off the portion divided by scores 8 and 8, unlike the conventional similar type. A significant advantage is achieved that it is easier to perform than container closures.

In FIG. 5A illustrating the opening operation, by inserting a finger into the grip part 6 of the opening tab 5 and pulling it in the horizontal direction, the scores 8, 8 of the skirt part 4 are first sheared from the bases 7, 7, and the pieces are peeled off. It begins. Next, by lifting this tab 5 upward, the scores 8, 8 provided on the top plate portion 3 are sheared. The operation up to this stage is exactly the same as that of a known easy-open container lid.

However, in the container lid of the present invention, the liner 2 and the second coating film 10 are firmly adhered, and the second coating film 10 and the first coating film 9 are easily peelable on the peeling start side. Therefore, the score is 8,8
As the shear progresses, peeling progresses at the interface between the coating films 9 and 10, and this peeling between the coating films is extremely easy as the shell portion 17 surrounded by the scores 8 and 8 is deformed by peeling. It will be held in In addition, the shell parts 18, 18 on the outside of the score remain on the container mouth 19 side even if the peeling progresses, and the liner 2 also remains on the container mouth 19 side, but in the present invention, the coating film 10 also remains in close contact with the liner 2 on the container mouth side, so that in the initial stage of peeling, the liner 2 will not be pulled by the peeled portion 17 and will not interfere with the shearing of the scores 8 and 8 or the pulling up of the portion 17.

Moreover, this tendency is further enhanced by making the second coating 10 tough and highly elastic, while making the first coating a brittle coating.

In the present invention, it is particularly desirable that the adhesive area B has a pattern as illustrated in FIG. That is, in FIG. 5-B, the liner 2 adhered via the adhesive area B by the portion 17 divided by the scores 8, 8 is also lifted upward, and the score 8,
As the shearing of the score 8 progresses and the liner 2 is lifted upward, the outer portions 18, 18 of the shell remaining outside the score 8 and on the side of the container mouth 19 act to spread outward. During this period, the peeling between the shell portion 17 and the liner 2 gradually progresses in the wedge-shaped adhesive region B, and the peel strength and the yield force of the outward deformation of the outer shell portions 18, 18 increase. When the balance is reached, the opening ends. Thus, in the present invention, the tensile force of the tab is effectively used for opening without the opening operation being accompanied by excessive stretching of the liner, i.e., without requiring excessive force. , opening is very easy.

Moreover, this opening operation is difficult because the non-adhesive coating film 9 is partially missing in the center of the liner or its vicinity, and the peel strength of the adhesive area B is continuous or gradual in the peeling direction. This is becoming easier as the number of users increases.

In addition, in the present invention, since the coating film 10 on the shell body and the liner 2 are strongly bonded at the center of the shell body, even when molding the liner by resin embossing, the resin mass for forming the liner is removed from the shell body. This effectively prevents the trouble of the liner from flying out in the opposite direction, and since the non-adhesive coating film 9 is partially absent from the center of the liner, accidental detachment of the liner forming resin is even more completely prevented. Ru.

As the coating film 9, hydrocarbon resins or natural resins having a softening point (ring and ball method) of 180° C. or lower, especially 120° C. or lower are preferably used, and in particular, petroleum resins, coumaron indene resins, terpene resins, Rosin, rosin ester, rosin modified resin, etc. are preferable.

The epoxy paint for the coating film 10 is preferably a combination of an epoxy resin component and at least one thermosetting resin selected from the group consisting of resol-type phenol-formaldehyde resins, urea-formaldehyde resins, and melamine-formaldehyde resins. used for.

When the liner 2 is made of a vinyl chloride resin, the coating 10 may be a double coat of a lower coating of an epoxy resin and an upper coating of an acrylic or vinyl resin.

In the present invention, it is not necessary to provide the strongly adhesive coating 10 on the entire top plate of the shell 1. For example, as shown in the plan view of FIG. 6, the second coating film 10 is not provided in the area other than the peeled-off portion 17, so that peeling easily progresses between the first coating film 9 and the liner 2. You may also do so. Hydrocarbon resins or natural resins are also well suited for this purpose.

Further, a second interface, ie, a peelable interface, can also be formed between the metal material of the shell and the coating film.

(Effects) According to the present invention, a container with an easy-to-open liner that prevents the liner from separating from the shell during the manufacturing process, transportation, or plugging process and has excellent sealing performance and corrosion resistance is provided. You will get a lid.

Moreover, this container lid with an easy-to-open liner can be extremely easily peeled off at the section defined by the score.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the container lid according to the present invention.
Fig. 2 is a cross-sectional view showing the coating film structure of the container lid according to the present invention, and Fig. 3 is a partial enlargement of the cross-sectional view shown in Fig. 2, and a cross-section taken between XX in Fig. 4. FIG. 4 is a partially enlarged cross-sectional view, and FIG. 4 is a partial plan view showing the adhesive area of the container lid according to the present invention, and FIGS. FIG. 6 is a partial perspective view showing a state in which the container lid is opened after being capped, and FIG. 6 is a partial plan view showing another example of the arrangement of the coating film on the container lid according to the present invention. 1... Container lid, 2... Liner, 3... Top surface,
4...Skirt, 5...Tab, 6...Gripping part, 8
...Score, 9...First coating film, 10...Second coating film, 14...Undercoat.

Claims (1)

[Claims for Utility Model Registration] (1) A container lid shell body consisting of a top plate portion and a skirt portion connected thereto, and in which the top plate portion or the skirt portion is provided with a weakened line for opening that defines a peel-off portion. and a sealing liner provided on the inside of the container lid shell through a coating film, the liner being provided on the inner surface of the container lid shell via multiple layers of coating films, The coating film on the liner side is an adhesive coating film that has strong adhesion to the liner, and the liner is formed by stamping resin inside the container lid shell, and has a sealing ring on the outer periphery and a sealing ring on the inner periphery. and a thin-walled part on the shell side of the adhesive coating film, and a base coating film that is easily peeled off from the adhesive coating film is provided on the shell side of the adhesive coating film at a position corresponding to at least the peeling start side of the peeling part. An easy-to-open container lid with a liner. (2) Scope of Utility Model Registration No. 1 where the base coating is a coating containing a hydrocarbon resin or natural resin, and the adhesive coating is a coating containing an epoxy resin.
Container lid as described in section. (3) The container lid according to claim 1, wherein the liner is made of olefin resin and the adhesive coating is an epoxy coating containing oxidized polyethylene or acid-modified olefin resin. (4) Among the plurality of coating layers, the base coating on the shell side is partially missing near the center,
The container lid according to claim 1, wherein the peel strength of the liner and the peeling portion gradually increases in the peeling direction.