JPS6144736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a container lid with an easy-to-open liner, and more specifically, the present invention relates to a container lid with an easy-to-open liner. This invention relates to a type of container lid that is peeled off and opened.

(Prior Art) Conventionally, in the field of container lids such as bottle lids, a score ( A widely used method is to divide the tear-off part with a line of weakness or a cut line, and to open the bag by shearing the score by pulling the grip part provided at the opening start part with your fingers. . Naturally, this type of easy-open container also needs to be provided with a resin sealing liner 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 the 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 by the Invention) However, in this method of adhering the liner and the shell, forming a sealing liner in a desired shape by stamping the liner-forming resin has certain defects. Accompany. That is, 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 adhere to the inside of the shell and cause the next process. However, the known method in which the liner is not glued in the center has the disadvantage that the applied resin lumps fly out of the shell due to centrifugal force or the like.

In order to prevent this, when the liner and the shell are bonded at the center, it is necessary to break the bond between the top plate and the liner when opening the package, which may cause problems such as difficulty in opening the package, or A problem arises in that the contents of the container spill outside due to the impact force associated with the destruction.

Therefore, the technical problem of the present invention is to provide an easy-to-open property in which the liner can be formed by molding the resin without failures such as the resin popping out of the shell, and the unsealing operation can be performed smoothly and easily. To provide a container lid with a liner.

(Means for Solving the Problems) In the present invention, the sealing liner is formed by molding a resin with a shell having a heat-adhesive coating film on the inner surface of the liner. , the liner and the shell are adhered via the coating film in such a manner that the liner and the shell are peelable from the center of the shell and the peel strength increases continuously or stepwise in the peeling direction; Moreover, the coating film is firmly adhered to the inner side in the peeling direction than the center part.

(Function) In the present invention, a heat-adhesive coating film is provided on the liner both on the peeling start side from the center of the shell and on the back side in the peeling direction from the center of the shell. This makes it possible to mold the liner into a predetermined shape by stamping while preventing the resin from jumping out of the shell.

In addition, from the center of the shell to the side where peeling starts, the liner is bonded so that it can be peeled off and the peel strength increases continuously or stepwise in the peeling direction. On the inner side, the liner and the shell are adhered to each other in a substantially unremovable manner, making it possible to easily and smoothly open the bag.

That is, in FIG. 4 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. Then the peeling process begins. Then, by lifting this tab 5 upward, the scores 8, 8 provided on the top plate portion 3 are sheared. A liner 2 is interposed between the outer portions 17, 17 of the shell remaining on the side of the container mouth 16 outside the score 8 and the container mouth. Then score 8,8
As the shearing progresses, peeling gradually progresses between the liner 2 and the releasable adhesive coating at the peeled portion (indicated by a chain-line triangle in FIG. 4), and the liner 2 is lifted upward. This acts to spread outward the outer portions 17, 17 of the shell remaining on the side of the container opening 16 outside the score 8, thereby increasing the peel strength between the liner and the peeling portion and the outer portion of the shell. The unsealing ends when the yield force of the deformation to the parts 17, 17 is balanced. Thus, according to the present invention, the unsealing operation can be smoothly performed without generating an impact due to adhesive failure during unsealing.

(Operations and Effects of the Invention) According to the present invention, in this type of easy-to-open container lid, molding into a predetermined liner shape most convenient for sealing and adhesion to the shell can be simultaneously performed by embossing, and it is easy to do so. It is possible to manufacture an openable container lid with fewer steps and at a high production rate.

(Example) 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 and a sealing liner 2 provided on the inside thereof.
It consists of. The shell 1 consists of a top plate part 3 and a skirt part 4 that is continuous with the top plate part 3 and hangs down from the periphery thereof. An opening tab 5 is provided integrally with this skirt portion 4 and protrudes outward,
A grip portion 6 is provided at the tip of the 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 these scores
It extends along the outer periphery or the boundary between the top plate part 3 and the skirt part 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 produced 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 (see Fig. (not shown), and consists of at least one thick-walled sealing ring 11 to be engaged with the container mouth and a thin-walled portion 12 located on the inner peripheral side of the sealing ring. . The liner 2 can be formed by pressing a mass of plastisol such as vinyl chloride resin with a heated punch to gel it.

According to the present invention, an adhesive area is provided at the center of the liner between the liner 2 and the coating film 9, and this adhesive area can be peeled off at least on the peeling start side. Second
In the specific example shown in the figure, the lower coating film 9 is a protective coating applied to the metal surface of the shell, and is strongly adhesive to the shell, but non-adhesive or non-adhesive to the liner 2. has extremely weak adhesion. On the other hand, the coating film 10 corresponding to the center portion of the liner is applied on the coating film 9, exhibits strong adhesion to both the coating film 10 and the liner 2, and forms the adhesive area described above.

In Figure 3-A showing an example of this adhesive area,
The adhesive zone 13 consists of a peelable adhesive part 14 on the peeling initiation side and a stronger adhesive part 15 following it in the peeling direction. In the embodiment shown in Figure 3-A, the coating 10 adhesive to the liner
The peeling force is adjusted by applying it in an irregular shape, and the peelable portion 14 has a wedge shape with an acute angle α on the peeling start side, and the strong adhesive portion 15 following this has a semicircular shape. It has the shape of Thus, it will be understood that this specific example provides a directional adhesive region in which the peel strength in the peel direction A is smaller than the peel strength in the direction B perpendicular thereto. Furthermore, this peelable adhesive part 1
4, it will be clear that the peel strength increases continuously in the peel direction A.

In the present invention, from the viewpoint of easy opening, the third
- As shown in Figure A, it is desirable that the releasable adhesive portion 14 of the adhesive area 13 be located within the area surrounded by scores 8 and 8, and in particular, the entire adhesive area 13 is located within the area surrounded by scores 8 and 8. It is desirable to be located in

Furthermore, in the present invention, since the shell and the liner are bonded at the center of the shell, there is no problem that the liner-forming resin lump may fly out from the shell when the liner is molded by resin embossing. By making the peel strength in the peeling direction of the adhesive region smaller than the peel strength in the direction perpendicular to this, the above-described Problems can be resolved.

Further, in the present invention, since the sealing liner is provided to cover the inner top surface of the container lid, there is no direct contact between the shell and the contents, so that a container lid with excellent corrosion resistance can be obtained.

Furthermore, in the present invention, the sealing liner has a press-molded sealing ring, thereby making it possible to completely seal the mouth of the container.

As the metal material forming the container lid shell, light metals such as sheet-like or foil-like surface-untreated steel (black plate), surface-treated steel, aluminum, etc. are used. Surface-treated steel includes chemical treatments such as phosphoric acid treatment and chromic acid treatment; chemical conversion treatments such as electrolytic chromic acid treatment; electrolytic plating treatments such as electrolytic tin plating, electrolytic zinc plating, and electrolytic chrome plating; molten aluminum plating. Examples include those that have been subjected to a hot-melt plating process such as a hot-dip tin plating process.

The coating film 9 may be a paint that exhibits excellent adhesion and corrosion resistance to metal materials, such as a thermosetting resin paint, such as a phenol-formaldehyde resin, a furan-formaldehyde resin, or a xylene-formaldehyde resin.
Formaldehyde resin, ketone formaldehyde resin, urea formaldehyde resin, melamine
Formaldehyde resin, alkyd resin, unsaturated polyester resin, epoxy resin, bismaleimide resin, triallyl cyanurate resin, thermosetting acrylic resin, silicone resin, oil-based resin, or thermoplastic resin coating, such as vinyl chloride-vinyl acetate copolymer union, partially saponified vinyl chloride-vinyl acetate copolymer, vinyl chloride-maleic acid copolymer,
Vinyl chloride-maleic acid-vinyl acetate copolymer,
Acrylic polymers, saturated polyester resins, etc. may be used alone or in combination of two or more, but of course the paint used must not exhibit strong adhesion to the liner.

The paint 10 used to form the adhesive area 13 differs depending on the type of liner, but for example, in the case of an olefin resin liner, oxidized polyolefin, acid-modified polyolefin, or a paint containing these mixed with the paint resin may be used. used. In the case of vinyl chloride resin, vinyl chloride paint or acrylic paint is used.

The present invention can be modified in many ways without departing from the spirit of the invention described above.

For example, as shown in Figure 3-B, the releasable adhesive area 14 is made up of a paper-shaped adhesive paint 10A extending in the peeling direction A, and the central part of the paper is longest toward the peeling start side. They can be arranged in such a way that they are elongated and the length becomes gradually shorter toward the end.

Further, as shown in Fig. 3-C, the adhesive area 13 is formed with a halftone dot-like adhesive paint 10B, and the rows of halftone dots 10B are aligned in the peeling direction A, and the rows of halftone dots are arranged in the central part. It extends longest toward the side where peeling starts,
They can be arranged so that their lengths gradually become shorter toward the ends.

Further, as shown in Fig. 3-D, the adhesive area 13 is formed with a dot-shaped adhesive paint 10C, but the dots 10C may be arranged so that the diameter thereof gradually increases in the peeling initiation direction. . In this specific example, halftone dot 1
0C has a pyramid shape with the tip located on the peeling initiation side, so that the peel strength can be varied over a significantly wide range in the peeling direction.

Furthermore, as shown in Figure 3-E, the adhesive area 1
The peelable adhesive area 14 of No. 3 can be formed into a wedge shape similar to that shown in FIG. 3-A, and the strong adhesive area 15 can be provided so as to cover the entire semicircle of the liner.

In the present invention, the peel strength in the removable adhesive area 14 is adjusted by the application pattern of the adhesive paint 10 shown in the figure, that is, a pattern in which the applied width of the adhesive paint gradually increases from the peeling start side toward the peeling direction. It should be understood that this is also possible by changing the amount of adhesive paint applied or the concentration of the adhesive component in the adhesive paint (for example, changing the concentration of polyethylene oxide in an epoxy-phenol paint containing polyethylene oxide). It is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a container lid according to the present invention;
Fig. 2 is a sectional view showing the structure of the coating film of the container lid according to the present invention, and Figs. 3-A to 3-E are sections showing various specific examples of the adhesive area of the container lid according to the present invention. FIG. 4 is a plan view, and FIG. 4 is a partial oblique view showing a state in which the container lid according to the present invention is opened after being plugged into the mouth of the container. 1... Container lid, 2... Liner, 3... Top surface,
4...Skirt, 5...Tab, 6...Gripping part, 7
... Root, 8 ... Score, 9 ... Paint film, 10,
13... Adhesive area, 14... Peelable adhesive part, 1
5... Strong adhesive part.

Claims (1)

[Scope of Claims] 1. A shell body consisting of a top plate portion and a skirt portion connected thereto, a pair of scores extending from the skirt portion across the top plate portion, and a peel-off portion for opening defined by the scores. and a sealing liner applied to the inner surface of the shell; The liner and the shell are formed by molding a resin, and the liner and the shell have the above-mentioned properties such that the peel strength increases continuously or stepwise in the peeling direction from the center of the shell to the peeling start side. 1. An easily openable container lid, characterized in that the lid is adhered via a coating film, and is firmly adhered by the coating film on the back side in the peeling direction from the center part.