JP2722288B2 - Secret sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secret sheet having hidden information such as characters and figures, which can be peeled off to view the information.

[0002]

2. Description of the Related Art At present, a representative example of a secret sheet most widely used is a postcard sent from a credit or insurance company to a customer. Information to be transmitted to the customer is printed on the back of the postcard. An concealing label is attached from above to conceal this information. The concealing label is formed by pseudo-adhering a transparent polyester film having a pressure-sensitive adhesive layer applied to one side of a label paper via a polyethylene layer. The concealment label is attached to the back of the postcard by the adhesive layer on polyethylene, but when peeling it off, the concealment label leaves the polyester film on the postcard side by adhesion by the adhesive layer, and removes it from the polyethylene layer. It can be conveniently separated and hidden information can be seen from outside through a transparent polyester film.

[0003]

The above-described structure of the secret sheet requires a technique of pseudo bonding of the film,
The production thereof requires special equipment and has a drawback that the cost is increased as a result, and there has been a strong demand for an inexpensive and simple secret sheet instead of this. The present invention has been developed to satisfy such a demand, and an object of the present invention is to provide a new and useful secret sheet by applying conventional adhesive paper and / or adhesive paper.

[0004]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows.
Provided is a secret sheet comprising a coated paper, a first adhesive layer applied to the coated paper, a thin paper stuck to the first adhesive layer, and a second adhesive layer applied to the thin paper. Achieved by:

[0005]

In the case where the secret sheet having the above-described structure of the present invention is pasted through a second adhesive layer onto a document in which information such as characters and figures are printed, handwritten, etc., the coated paper is applied to the document. If it is to be peeled from the thin paper, the peeling will occur due to delamination of the thin paper. That is,
Since thin paper is adhesively bonded on both sides to the adhesive,
When the coated paper and the document are separated from each other, the coated paper and the document are pulled substantially equally by both, and delamination occurs. By the way, the information written on the document can be seen through the thin paper and the second pressure-sensitive adhesive layer which are reduced in thickness by half due to delamination, and the information can be read.

[0006]

1 shows a secret sheet 1 according to the present invention.
2 shows a cross-sectional view of a document 10 in which necessary hidden information to be pasted with the secret seal 1 is described. The secret seal 1 includes a first pressure-sensitive adhesive layer 3 applied to a coated paper 2,
And a thin paper 4 attached to the adhesive layer 3. Thin paper 4
Is desirably an extremely thin paper layer such as tissue paper and has a smooth surface.

[0007] The secret seal 1 also has a second pressure-sensitive adhesive layer 5 applied to the thin paper 4, and this second pressure-sensitive adhesive layer is usually covered with a protective paper 6 subjected to a release treatment. It will be noted that the coated paper 2 coated with the first adhesive layer is nothing but so-called conventional adhesive paper. Therefore, in forming the secret sheet according to the present invention, such an adhesive paper can be used as it is.

In using the secret sheet,
The protection paper 6 is peeled off on the document 10 on which required hidden information is printed or handwritten, and the secret seal 1 is attached by the second adhesive layer 5. At that time, the information is hidden by the cover paper 2 of the secret seal 1. FIG. 2 shows a document 10 describing required hidden information.
2 shows a state in which the secret seal 1 from which the protective paper 6 has been peeled off is attached.

Incidentally, a hot-melt type adhesive layer may be used instead of the second adhesive layer 5. In this case, of course,
There is no need to cover the adhesive surface with protective paper. When a hot-melt adhesive layer is used, hidden information is printed or handwritten on the document 10 in the same manner as described above, and the hot-melt adhesive layer is superimposed on the hidden information. Is applied, the adhesive layer 5 is activated and adheres to the document 10.

[0010] In the secret sheet 1, the coated paper 2
To facilitate stripping, see, for example, FIGS.
As shown in (1), the coated paper 2 is preferably cut along one edge thereof, that is, a slit 7 is formed. Thus, if the coated paper 2 is to be peeled from the document 10, the peeling will occur due to delamination of the thin paper 4. That is, since both sides of the thin paper 4 are adhesively bonded to the adhesive, when the coated paper and the document are to be peeled off from each other, the thin paper 4 is pulled substantially equally by both of them and causes delamination. When the thin paper is separated into two parts 4a and 4b by delamination (see FIG. 3), the information 11 of the document is transparent through the half-thick thin paper part 4b and the second adhesive layer 5. You can read that information.

[0011] In this type of secret sheet, it is required that hidden information cannot be recognized by watermarking in a state where the coated paper is pasted on the document.
As one of the measures, it is preferable to mix aluminum powder into the first adhesive applied to the coated paper so as to prevent light transmission. Further, as another example, a concealing pattern exhibiting information concealing property may be printed in advance on the first pressure-sensitive adhesive layer side of the coated paper, or may be subjected to aluminum vapor deposition.

[0012]

As described above, the secret sheet according to the present invention has an extremely simple structure in which extremely thin paper is bonded to the adhesive paper, so that the conventional bonding technique can be used in the production thereof. As a whole, an inexpensive secret sheet can be provided. In addition, the secret sheet according to the present invention can be used not only as a postcard that allows a credit, an insurance company, or the like to inform a customer of hidden information, but also can be used as a tag for various kinds of winning lottery and delivery processing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view before a secret sheet according to the present invention is attached to a document in which required hidden information is described.

FIG. 2 is a cross-sectional view showing a state in which the secret sheet according to the present invention from which the protective paper has been peeled off is attached to a document in which necessary hidden information is described.

FIG. 3 is a perspective view of the secret sheet according to the present invention in a state where the coated paper is peeled off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secret seal 2 Coated paper 3 1st adhesive layer 4 Thin paper 5 2nd adhesive layer 6 Protective paper 10 Document

Claims (6)

(57) [Claims] And 1. A coated paper, a first adhesive layer applied to the coated paper, a thin paper pasted on the first pressure-sensitive adhesive layer, secret and a second tacky Chakuzaiso coated on the thin paper Sheet. 2. The secret sheet according to claim 1, wherein a protective paper that has been subjected to a release treatment is bonded to the second pressure-sensitive adhesive layer. Wherein the second tacky Chakuzaiso consists hot-melt adhesive, secret sheet according to claim 1. 4. The secret according to claim 1, wherein an aluminum powder is mixed into the first pressure-sensitive adhesive layer in order to secure concealment of information of the document when a secret sheet is attached to the document. Sheet. 5. A concealment pattern is printed on a back surface of the coated paper to secure concealment of information of the document when a secret sheet is attached to the document.
Or the secret sheet according to 2. 6. The backside of the coated paper is coated with aluminum to secure the concealment of information of the document when a secret sheet is attached to the document.
The secret sheet according to any one of claims 3 to 3.