JP2573266Y2 - Prize resin cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin cap for a prize, and more particularly, to a resin cap for a prize having an excellent sealing property even after peeling off a liner, and having excellent productivity and workability.

[0002]

2. Description of the Related Art Conventionally, for the purpose of enhancing and promoting the effect of promoting and selling bottled products, the display of "winning", "losing", and other characters, symbols, figures, and the like of a prize on the inner surface of the cap shell top surface. A cap with a printed mark is used. After opening the cap, the liner is peeled off from the cap shell, so that the consumers can enjoy the display printed on the inner surface of the top surface of the cap. In such a cap, since the liner is peeled off from the cap shell after opening, the cap after peeling off the liner is inferior in the sealing property of the container, and this type of cap is not suitable for re-closing. Did not. For this reason, it is desired that the cap after the liner is peeled off can maintain the sealing property.

In order to maintain the sealing property of the cap after the liner is peeled off, the liner of the sealing part which keeps the sealing property of the cap of the liner and which comes into contact with the container opening is left on the cap shell and printed and displayed. There is a prize cap of the type that peels off the liner at the center (such as the center). In this cap, the portion of the liner to be removed is surrounded by a weakening line (score), and a projection is provided therein. When this projection is pulled, the weakening line is broken and only the portion surrounded by the weakening line is peeled from the cap shell. (Japanese Utility Model Laid-Open No. 60-75247, etc.).

[0004]

Generally, in order to form a liner, a molten resin is poured into a cap shell and formed by embossing the resin, or a resin sheet corresponding to the inner surface of the top plate is inserted into the cap shell and heated. It is formed by bonding. In the former method, in order to provide the line of weakness on the liner, it is necessary to provide a liner forming die with a projection for forming the line of weakness, and in the latter method, it is necessary to engrave the line of weakness on the resin sheet. ,
Both methods have the problem that the liner molding process is more troublesome than the method without the line of weakening. There was also a problem of inferiority.

In the former method, the molten resin is applied to the center of the cap shell, and the molten resin is spread thinly over the entire inner surface of the top plate of the cap shell while embossing the resin. When the protrusions are provided, there is a problem that the flow of the resin is deteriorated in that portion and the productivity of the liner is reduced. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a prize cap which can maintain the sealing property of a container even after the liner is peeled off, without providing a weakening line for peeling off the central portion of the liner.

[0006]

According to the present invention, the top plate portion is formed of a resin cap shell having an inner ring provided on the inner surface of the top plate portion so as to be in close contact with the inner surface of the container mouth, and is divided by the inner ring. In a cap in which a printing ink layer is applied to a central portion of the inner surface and a resin liner is provided so as to cover the printing ink layer, the resin liner includes a molten resin for forming a liner in a cap shell. It is adhesively fixed to the inner surface of the top plate so that it can be peeled off by press-forming while being supplied, and a knob for peeling is formed on the liner. Is to be peeled off from the inner surface of the top plate portion, and the inner ring has a projection that is inclined inward and downward, and the peripheral edge of the resin liner is A cap, characterized in that held by the inclined protrusions are provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cap according to the present invention will be described with reference to the accompanying drawings. In FIG. 1 showing an example of the cap of the present invention, a cap indicated by 1 is a cap shell 4 including a top plate 2 and a skirt portion 3 hanging from the top plate, an inner ring 5 provided on the inner surface of the top plate, and an inner. Ring 5
A print layer 7 is provided on the liner holding projection 6 provided inside the top plate and on a central portion of the top plate section defined by the inner ring. A releasable liner 8 is provided at the center of the cap shell top plate so as to cover the printing layer 7. In the center of the liner 8, a knob 9 serving as a clue for peeling the liner is formed integrally with the liner. The inner ring 5 is an annular projection having an outer diameter corresponding to the inner diameter of the container mouth, and is fitted inside the container mouth when closed as shown in FIG. Can be secured.

In general, in a prize cap, since the liner is easily adhered to the liner, the liner is formed on the entire top plate of the cap and supported between the container opening and the cap shell. However, in the cap of the present invention, the protrusion provided on the inner ring has a shape protruding inward so as to hold the liner. The liner cannot be removed without it.

The shape of the projection provided on the inner ring is not limited to the one shown in FIG. 1. For example, the inner ring may not be a special projection, but may have a thickness that increases inward as the inner ring itself approaches the tip. Any shape can be adopted as long as the liner can be supported at the tip of the ring.

The liner is formed by supplying the resin composition for forming the liner into the cap in a molten state since the inner ring has a projection such as an undercut.
Molding can be advantageously performed by employing a method of pressing and molding using a cooled mold. The resin that forms the liner
Opaque ones are preferred so that the print of the prize mark or the like is concealed, but not limited thereto, low-density polyethylene, ethylene-vinyl acetate copolymer, synthetic rubber such as styrene-butadiene rubber, and optional rubber such as soft vinyl chloride. Or a blend of two or more thereof.

In the cap of the present invention, since the liner is used for concealing the printed display, it is not necessary to consider the sealing performance as the performance of the liner unlike the conventional prize cap. Can also be selected from a wide range of materials. For example, when the present invention is applied to a resin container that fills contents that require heat filling and heat treatment, a hard or heat-resistant resin can be selected to form a liner. By doing so, the inward change of the container mouth over time can be prevented, and the sealing performance can be further improved.

In the cap of the present invention, besides the inner ring, the sealing performance can be enhanced not only at the tip of the container mouth but also at the seal between the caps. That is,
Even after the liner is peeled off after opening, the seal portion between the container mouth end and the cap does not change at all, so that good sealing performance can be maintained even after re-opening. Further, it is not necessary to particularly provide a liner in the seal portion, but it is of course possible to provide an annular liner in the cap shell to obtain higher sealing performance.

The printing layer may be of any type, such as a type that remains on the top of the cap shell, or a type that is transferred to a liner and peeled off together with the liner.

The cap shell can be formed by, but not limited to, injection molding or compression molding of a synthetic resin such as polypropylene or polyethylene. Also, the present invention can be applied to caps other than the screw cap shown in FIG.
In the case of a screw cap, it is of course possible to provide a tamper-evidence band below the cap shell skirt portion, thereby giving the cap a clear opening function.

[0015]

According to the present invention, only the portion of the liner where the prize mark or the like is printed can be peeled off without providing a line of weakness in the liner, and the liner is held by the protrusion provided on the inner ring. Therefore, there is an advantage that there is no danger of falling off unless the peeling is intended. Further, since the liner is not provided with a weakening line for peeling off the central portion, the liner is easily formed, and the processability and productivity are excellent.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a cap of the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Cap 4 Cap shell 5 Inner ring 6 Liner holding projection 7 Printing layer 8 Liner 9 Knob

Claims (1)

(57) [Scope of request for utility model registration] 1. A printing ink layer is formed at the center of the inner surface of the top plate section, which is provided with an inner ring provided on the inner surface of the top plate section so as to be in close contact with the inner surface of the container opening. In a cap provided with a resin liner so as to cover the printing ink layer, the resin liner is formed by pressing a molten resin for forming a liner into a cap shell to form a top plate portion. A peeling knob is formed on the inner surface so as to be peelable, and a peeling knob is formed on the liner. By pulling the knob, the entire liner is peeled off from the inner surface of the top plate portion. The inner ring has a projection that is inclined inward and downward, and the peripheral edge of the resin liner is held by the inclined projection. Cap, characterized by being.