JPH0320308Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a box that indicates that the package has been opened. This relates to a box whose opened status can be determined at a glance.

[Conventional technology]

Conventionally, some boxes have a label attached to the opened part, allowing you to determine at a glance whether the box has been opened. This label is partially provided with a release layer, and when the label is peeled off when the package is opened, this release layer portion is captured on the box, thereby making it possible to determine whether the package has been opened.

However, since this method uses a label, it has the disadvantage that a label affixing process is required in addition to the normal packaging method.

[Problem that the invention attempts to solve]

Focusing on the fact that boxes for confectionery, caramels, etc. are usually packaged with shrink film, the present invention is a box that allows you to determine whether the package has been opened or not, without requiring any special process other than the normal packaging process. The purpose is to provide

[Means for solving problems]

In order to achieve this objective, the present invention prints at least one part of the base with an acrylic water-based ink, a cyclized rubber-based ink, or a polyamide ink, and then contains 70 to 50% salt vinyl acetate as a resin content, and polyester
To provide a box for displaying an unsealed state, characterized in that a carton printed with a heat-sealable colored varnish containing 30 to 50% of a mixture is formed, and then shrink-wrapped with a shrink film.

[Effect]

According to the present invention, when the Shrink film is peeled off, the colored varnish is peeled off from between the colored varnish and the base printing layer, and the colored varnish is removed onto the Shrink film side, so that the opened state of the Shrink film can be determined. Moreover, the adhesive strength between the colored varnish and the base printing layer is 30 to 60 g/15 mm, which prevents accidental peeling and is easy to open.

[Explanation of Examples]

The box according to the present invention is a paper carton wrapped in shrink film. Figure 1 of the drawings is a perspective view showing this example, where 1 is a carton, 2 is a
The dotted chain line indicates the shrink film. Although the present invention may be applied to any part thereof, it is preferable to apply it to the surface where the end of the shrink film 2 is present, for example, the surface A in FIG.

This A side has the following structure. That is, FIGS. 2a to 2c are explanatory cross-sectional views for explaining this structure, where 3 is the innermost cardboard and 2 is the shrink film. Here, the cardboard 3 has a base printed on its outer surface using base ink 4, and a heat-sealable colored varnish 5 is applied thereon.

This base ink 4 is an acrylic water-based ink,
It is made of either cyclized rubber-based ink or polyamide-based ink, but since it is base printing, it must be printed all over the surface. Note that 5% or less of wax can be mixed with this ink in order to improve the releasability when opening the package.

Heat-sealable colored varnish 5 is 70-60% salt vinyl acetate,
The resin content is 30-40% polyester, for example, 15-40% resin, 4-25% color pigment, 1-5% wax, and 50-80% solvent (methyl ethyl ketone, toluene, methyl isobutyl ketone, etc.). Mixtures can be used.

After this carton is formed, it is shrink wrapped as shown in FIG. Figure 2b shows A at this time.
This is an explanatory cross-sectional view for explaining the surfaces, and on side A, the shrink film 2 and the colored varnish layer 5 are bonded together by heat during shrink.

FIG. 2c shows the state when the package is opened, and as can be seen from the figure, when the package is opened, the colored varnish 5 adheres to the shrink film 2 and is peeled off between the colored varnish 5 and the base ink 4. Although any shrink film can be used, for example, a polyvinyl chloride shrink film is suitable.

In addition, the base ink 4 is an acrylic water-based ink, the colored varnish 5 is a mixed resin of 60% salt vinyl acetate and 40% polyester, 20% pigment, 6% pigment, and wax 3.
% of the solvent was used, the peel strength of both was 30 to 60 g/15 mm.

Almost the same peel strength was obtained when a cyclized rubber ink or a polyamide ink was used instead of the acrylic water-based ink. Note that when nitrocellulose was used instead of this ink, it did not peel off and the shrink film was torn. Furthermore, when chlorinated rubber or chlorinated polyolefin was used, the base ink 4 was transferred to the shrink film.

The present invention is as described above, and since the colored varnish 5 is peeled off together with the shrink film 2 when the package is opened, it is possible to determine whether the package has been opened. 4, the base ink 6 colored in a different color can be printed in a pattern, or the colored varnish 5 can be printed in a pattern instead of all over the surface as shown in FIG. , which is also useful in displaying its opened status.

[Effect of idea]

As described above, the present invention utilizes the transfer of the colored varnish printed on the carton to the shrink film, so there is no need to add any additional process to the conventional packaging process, and it is also possible to indicate whether the package has been opened. have an effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view of a box, FIGS. 2 a to c are cross-sectional views of main parts for explaining the present invention, and FIGS. FIG. 2 is a cross-sectional view of a main part for explaining an embodiment. 1...carton, 2...shrink film,
3... Cardboard, 4... Base ink, 5... Colored varnish.

Claims (1)

[Scope of utility model registration request] At least one portion is printed with an acrylic water-based ink, a cyclized rubber-based ink, or a polyamide ink base, and then a heat-sealable colored varnish containing a mixture of 50 to 70% salt vinyl acetate and 50 to 30% polyester as a resin component is applied. A box for displaying an unsealed state, characterized in that a printed carton is made into a box and then shrink wrapped with a shrink film.