JP2007118325A - Paper for preventing from being seen through and unsealed unlawfully - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper, personal information or the like which is made not to be seen from both the front and rear side thereof and, at the same time, by which an unlawful unsealing made unrecognizable through re-pasting a paper after its content is seen by its peeling is prevented from developing. <P>SOLUTION: In the paper consisting of a surface (1), on which an adhesive is coated, a surface (2), on which a ground tint is printed, a surface (3), on which the ground tint is printed and a re-bondable self-adhesive is coated, and a surface (4), on which a releasant is coated, under the condition that a surface (5), on which a strong self-adhesive is coated, is provided between the surface (3), on which the ground tint is printed and the re-bondable self-adhesive is coated, and the surface (4), on which the releasant is coated and a perforation (6) is provided between the surface (5), on which the strong self-adhesive is coated, and the surface (3), on which the ground tint is printed and the re-bondable self-adhesive is coated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet having both a fluoroscopic function and an unauthorized opening prevention function.

  Conventionally, when personal information such as an individual's address, name, phone number, gender, age, etc. is written on a postcard and sent to a destination, the personal information cannot be seen by a third party other than the destination. In some cases, a sheet on which a re-adhesive glue is applied is adhered to a column in which the personal information is described.

  In addition, there is a technique for providing a concealment seal portion for concealing a location desired to be concealed in the postcard main body so that the location desired to conceal the postcard can be easily simplified (see, for example, Patent Document 1).

However, as mentioned above, the personal address, name, phone number, etc. written in the postcard, personal information written in questionnaires, answer sheets for questions, etc. If you do not want to see it, you may stick a sheet of paper on the matter to hide the personal information and the matter you want to keep confidential. However, there is a problem that it is not possible to see the matter to be concealed.
Therefore, in order to completely conceal the personal information, information that you want to conceal on the postcard, questionnaire form, answer sheet, etc., items, etc. not only from the front side, but also from the back side. There is an opaque pressure-bonded postcard in which a see-through preventing part (background pattern) is provided on the opposite surface where the two overlap, and an adhesive is applied (for example, see Patent Document 2).

Registered Utility Model No. 3108429 ([0005], [0006]) Registered Utility Model No. 3098137 ([0002], [0006])

  However, even if there is a see-through prevention part (background pattern) and it is not visible from the front or back, look at the part where the personal information is written by peeling it off from the corner of the paper, for example postcard After that, there was a case where it was difficult to know that it was stuck well and looked inside, and there was a problem of what to do in such a case.

  Therefore, the present invention makes it impossible to see personal information from the front and back, and at the same time, peels off the paper and looks inside, and then sticks it again. The object is to provide a sheet that prevents unauthorized opening.

In order to achieve the above object, the fluoroscopic and unauthorized opening prevention paper of the present invention is:
A sheet of paper,
The surface to which the adhesive is applied,
The surface on which the background pattern is printed,
A surface on which a tint block is printed and a re-adhesive adhesive is applied;
A surface to which a release agent is applied, and
The surface on which the copy-forgery-inhibited pattern is printed and the adhesive that can be re-adhered is applied has the surface on which the strong adhesive is applied between the surface on which the release agent is applied,
The surface to which the strong pressure-sensitive adhesive is applied is composed of perforations provided between the surface on which the ground pattern is printed and the pressure-sensitive adhesive that can be re-adhered.

  The surface to which the strong adhesive is applied is provided on the upper surface of the surface on which the tint block is printed and the adhesive that can be re-adhered is applied, and the surface to which the strong adhesive is applied ( It is preferable that a perforation is provided in the lower part of 5).

  The surface to which the strong adhesive is applied is provided below the surface on which the tint block is printed and the adhesive that can be re-adhered is applied, and the surface to which the strong adhesive is applied ( It is preferable that a perforation is provided in the upper part of 5).

  The surface to which the strong adhesive is applied is provided on the upper and lower sides of the surface on which the tint block is printed and the adhesive that can be re-adhered is applied, and the strong adhesive is applied to the surface. It is preferable that perforations are provided in the lower part of the upper part of the surface (5) and the upper part of the lower part.

Further, the fluoroscopic and unauthorized opening prevention paper of the present invention,
The surface to which the adhesive is applied,
The surface on which the background pattern is printed,
A surface on which a tint block is printed and a re-adhesive adhesive is applied;
It consists of a surface to which a release agent is applied,
The surface to which the adhesive is applied has a surface provided with a cut at an interval, and the surface on which the ground pattern is printed has a color on the side in contact with the surface on which the cut is provided. Has a given surface,
The surface on which the copy-forgery-inhibited pattern is printed and the adhesive which can be re-adhered is applied has the surface on which the strong adhesive is applied on the side of the surface on which the release agent is applied,
The surface to which the strong adhesive is applied is formed by perforation between the surface on which the background pattern is printed and the adhesive to which re-adhesion can be applied.

  In addition, it is preferable to have a perforation between the surface on which the ground pattern is printed and the adhesive which can be re-adhered is applied, and the surface on which the ground pattern is printed.

  Further, it is preferable that the see-through and unauthorized opening prevention paper is a postcard.

  Since the present invention has the above-mentioned configuration, it is impossible to see personal information from the front and back, and at the same time, even if it is pasted so that it does not understand after peeling a part of the paper and looking inside, This produces the effect of preventing unauthorized opening that the user can see what is seen.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 9 show the first embodiment of the present invention, and FIGS. 10 to 16 show the second embodiment.
In the drawings, a postcard is described as an example of the fluoroscopic and unauthorized opening prevention paper of the present invention.

FIG. 1 is a view showing a state in which a postcard of the present invention is opened. It has a surface 1 coated with an adhesive on one side and a surface 4 coated with a release agent on the other side opposite to the one side, between one side and the other side, It has a surface 2 printed with a tint block on the side, a surface pattern printed on the other side, and a surface 3 coated with a re-adhesive adhesive, and the tint block is printed and rebonded. A strong adhesive (that is, a strong adhesive) has a surface 5 applied between the surface 3 on which the possible adhesive is applied and the surface 4 on which the release agent is applied, A perforation 6 is provided between the surface 5 on which the strong adhesive is applied and the surface 3 on which a tint block is printed and a re-adhesive adhesive is applied.
Further, a perforation 20 is provided between the surface 3 on which the background pattern is printed and the adhesive which can be re-adhered is applied and the surface 2 on which the background pattern is printed.

  FIG. 2 is a view showing a state where the postcard of the present invention is being folded from one side and the other side, and FIG. 3 is a view showing a state where the postcard is folded and adhered and stuck from the state of FIG.

The surface 1 on which the adhesive is applied is folded and adhered to the surface 2 on which the background pattern is printed, and the surface 4 on which the release agent is further applied is applied to the adhesive 4 on which the background pattern is printed and re-adhered. Fold and fold it on the surface 3 being applied.
In this case, 7 is cut between the surface 4 to which the release agent is applied and the surface 5 to which the strong adhesive is applied.
The sender of the postcard obtains the postcard of the present invention in the state shown in FIG.

  FIG. 4 is a view showing a state where the surface to which the release agent is applied is being peeled off, and FIG. It is a figure which shows the state which is going to fold the applied surface toward the upper surface of the surface where the adhesive agent is applied. FIG. 6 is a view showing a state in which a surface on which a tint block is printed and a re-adhesive pressure-sensitive adhesive is applied is attached to the upper surface of the surface on which the adhesive is applied.

  After the postcard is obtained in the state shown in FIG. 3, for example, personal information such as address, name, contact information, credit number, etc. is written and the release agent is applied from the portion 8 indicating the location to be opened. 4 is opened and peeled off, and the surface 3 on which the tint block is printed and the adhesive which can be re-adhered is applied is folded in the direction of the arrow, and the upper surface of the surface 1 on which the adhesive is applied, that is, the personal information is described Fold it over the applied surface and attach it as shown in FIG.

FIG. 7 is a diagram showing a state where the surface on which the tint block is printed and the adhesive which can be re-adhered is applied is peeled from the portion showing the opening. When the surface 3 on which the copy-forgery-inhibited pattern is printed and the adhesive which can be re-adhered is opened from the portion 9 indicating the opening portion, the surface 3 opens along the perforation 6 and the portion of the perforation 6 is torn. Will go. Further, the perforation 20 is for a person who receives the postcard to cut out the surface 3, but even if a third party tries to peel off the surface 3 from the perforation 20 side, the perforation 20 Twenty parts will be torn.
Therefore, even if an unrelated third party other than the person in charge who receives the postcard defeats and restores the original, a trace of the perforation 6 remains and it is understood that someone has seen it. Therefore, unauthorized opening of unrelated third parties can be prevented.

FIG. 8 is a diagram showing that the surface to which the strong adhesive is applied is provided on the upper surface of the surface on which the tint block is printed and the adhesive that can be re-adhered is applied.
The surface 5 to which the strong adhesive is applied is printed on the ground pattern, and is provided on the upper side of the surface 3 to which the re-adhesive adhesive is applied. It shows that it is provided.

FIG. 9 is a diagram showing that the surface to which the strong adhesive is applied is provided on the upper and lower sides of the surface on which the tint block is printed and the adhesive that can be re-adhered is applied.
The surface 5 on which the strong adhesive is applied is printed on the background pattern, and is provided on the upper and lower portions of the surface 3 on which the re-adhesive adhesive is applied. The perforation 10 indicates that the perforation 11 is provided at the upper part of the lower portion of the surface 5.

  Although not shown, as shown in FIG. 9, the surface 5 to which the strong adhesive is applied may be provided only in the lower part.

FIG. 10 is a view showing a state in which the postcard of the present invention is opened.
It has a surface 12 coated with an adhesive on one side and a surface 15 coated with a release agent on the other side opposite to the one side, between one side and the other side, It has a surface 13 on which the copy-forgery-inhibited pattern is printed on the side, and a surface 14 on which the copy-forgery-inhibited pattern is printed on the other side and is coated with a re-adhesive adhesive.

  A large number of inverted U-shaped incisions 16 on the upper side and U-shaped incisions 16 on the lower side (surfaces of this notch) are spaced between the surface 12 on which the adhesive is applied and the surface 13 on which the background pattern is printed. May be not only U-shaped but also V-shaped, etc.) and has a surface 17 provided with a color and a surface 18 provided with color.

  The upper part 19 of the surface 13 on which the background pattern is printed is a blank portion, and the background pattern is not printed. However, when this portion that is the blank portion is adhered, the background pattern does not hit the portion for personal information protection. Although it is not printed, a tint block may be printed for convenience.

  A perforation 24 is provided between the surface 13 on which the tint block is printed and the surface 14 on which the tint block is printed and a re-adhesive adhesive is applied. This perforation 24 is for a person who receives a postcard to cut out the surface 14 on which the tint block is printed and the adhesive which can be re-adhered is applied. Even when the surface 14 is to be peeled off, the perforation 24 is broken, so that the third party can know that the third party has opened the tamper. .

  There is a surface 21 on which a strong adhesive is applied between a surface 14 on which a tint block is printed and a re-adhesive adhesive is applied, and a surface 15 on which a release agent is applied. A perforation 22 is provided between the surface 14 on which the tint block is printed and a re-adhesive adhesive is applied.

  FIG. 11 is a view showing a state where the postcard of the present invention is being folded from one side and the other side, and FIG. 12 is a view showing a state where the postcard is folded and adhered and stuck from the state of FIG.

The surface 12 on which the adhesive is applied is folded and adhered to the surface 13 on which the background pattern is printed, and the surface 15 on which the release agent is applied is printed with the background pattern, and a re-adhesive adhesive is applied. Fold it over to the surface 14 that is being applied.
In this case, 23 is cut between the surface 15 to which the release agent is applied and the surface 21 to which the strong adhesive is applied.
The sender of the postcard obtains the postcard of the present invention in the state shown in FIG.

  FIG. 13 is a diagram showing a state where the surface to which the release agent is applied is being peeled off, and FIG. 14 is a diagram showing a state in which the surface to which the release agent is applied is peeled off and a copy-forgery-inhibited pattern is printed. It is a figure which shows the state which affixed the surface currently apply | coated on the upper surface of the surface where the adhesive agent is apply | coated.

  After obtaining the postcard in the state of FIG. 12, the sender of the postcard describes personal information such as address, name, contact information, credit number, etc., and the surface 15 on which the release agent is applied from the portion 25 indicating the opening location 15 Is opened, the surface 15 to which the release agent is applied is peeled off, the surface pattern is printed, the surface 14 to which the re-adhesive adhesive is applied is folded, and the upper surface of the surface 12 to which the adhesive is applied That is, it is folded and pasted on the surface on which the personal information is described.

  FIG. 15 is a diagram showing a state in which a tint block is printed from a portion indicating an opening portion and a surface to which a re-adhesive adhesive is applied is opened. FIG. 16 is a diagram showing a state in which an unrelated third party opens the surface from the lower corner of the surface to which the strong adhesive is applied.

  As shown in FIG. 15, the person in charge who receives the postcard opens from the portion 26 indicating the position where the surface 14 on which the tint block is printed and the adhesive 14 which can be re-adhered is applied is opened.

  However, when an unrelated third party tries to see a part where personal information is written, a postcard is printed from a part 26 indicating a part where the surface 14 is printed and a surface 14 on which a re-adhesive adhesive is applied is opened. When the person in charge is opened so that it opens, the perforation 21 is broken, and even if it is returned to its original position, a broken mark remains in the perforation 21 and it is understood that someone has seen it.

  Therefore, an unrelated third party may try to open from the lower right corner of the surface 21 to which the strong adhesive is applied. When opening from the lower right corner of the surface 21, the inverted U-shaped and U-shaped cuts 16 are pulled to the back side of the surface 21 by the strong adhesive, and are torn and stuck. In this case, not only the inverted U-shaped and U-shaped cuts 16 are stuck, but also the paper around the cuts 16 is torn thinly. A torn portion 27 and a torn remaining portion 28 are shown in FIG. 16, but the surface 17 on which the cuts 16 are provided and the color surface 18 being applied are shown in FIG. When the notch 16 is broken and stuck to the surface 21 to which the strong adhesive is applied, the color can be seen and it can be clearly seen that it has opened.

  Furthermore, even if the opened part is returned to the original state, the ground pattern is printed, and the surface 14 to which the adhesive which can be re-adhered is applied and the surface 21 to which the strong adhesive is applied are lifted to be uneven. It becomes clear immediately that an unrelated third party opened.

Although not shown, the address of the recipient of the postcard, the name, the person in charge of the postcard, etc. are described on the reverse side of the surface 2 and 13 on which the background pattern is printed.
In the blank area in the figure, advertisements and notes can be written as necessary.

It is a figure which shows the state which opened the postcard of this invention. It is a figure which shows the state which is going to fold the postcard of this invention from one side and the other side. It is a figure which shows the state which folded and adhered and stuck from the state of FIG. It is a figure which shows the state which is going to peel the surface to which the peeling agent is apply | coated. The figure which shows the state which peels off the surface where the release agent is applied, tries to fold the surface where the copy-forgery-inhibited pattern is printed, and the surface where the re-adhesive adhesive is applied toward the upper surface of the surface where the adhesive is applied It is. It is a figure which shows the state which affixed the surface on which the copy-forgery-inhibited pattern was printed, and the adhesive agent which can be re-adhered was apply | coated to the upper surface of the surface to which the adhesive agent was applied. It is a figure which shows the state which is going to peel the surface on which the copy-forgery-inhibited pattern is printed and the adhesive which can be re-adhered is applied from the part which shows the location to open. It is a figure which shows that the surface where the strong adhesive is applied is provided in the upper part of the surface where the tint block is printed and the adhesive which can be re-adhered is applied. It is a figure which shows that the surface where the strong adhesive is applied is provided in the upper part and the lower part of the surface where the tint block is printed and the adhesive which can be re-adhered is applied. It is a figure which shows the state which opened the postcard of this invention. It is a figure which shows the state which is going to fold the postcard of this invention from one side and the other side. It is a figure which shows the state which folded and adhered and stuck from the state of FIG. It is a figure which shows the state which is going to peel the surface to which the peeling agent is apply | coated. It is a figure which shows the state which peeled the surface to which the release agent was applied, and the surface pattern was printed, and the surface to which the adhesive which can be re-adhered was stuck on the upper surface of the surface to which the adhesive was applied . It is drawing which shows the state which the surface pattern is printed from the part which shows the location to open, and the surface to which the adhesive which can be re-adhered is applied is opened. It is a figure which shows the state which the unrelated third party opens the surface from the lower corner of the surface where the strong adhesive is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,12 The surface where the adhesive is applied 2,13 The surface where the background pattern is printed 3,14 The surface where the background pattern is printed and the adhesive which can be re-adhered is applied 4,15 The release agent is applied Surface 5,21 Surface with strong adhesive applied
6, 10, 11, 20, 22, 24 perforation
7,23 Cutting part 8,9,25,26 Part indicating opening part 16 Notch 17 Surface provided with the cut 18 Colored surface 19 Upper part of the surface on which the background pattern is printed 27 Torn and stuck part 28 The part that remains after being torn

In order to achieve the above object, the fluoroscopic and unauthorized opening prevention paper of the present invention is:
One side has a surface coated with adhesive,
Having a surface coated with a release agent on the other side opposite to the one side,
Between the one side part and the other side part, on one side part side has a surface on which a tint block is printed,
Between the surface on which the tint block is printed and the surface on which the release agent is applied, the surface on which the tint block is printed and a re-adhesive adhesive is applied, and the surface on which a strong adhesive is applied And
The surface on which the copy-forgery-inhibited pattern is printed and coated with a re-adhesive adhesive is on the side of the surface on which the copy-forgery-inhibited pattern is printed,
The surface to which the strong adhesive is applied is on the side of the surface to which the release agent is applied,
The surface to which the strong pressure-sensitive adhesive is applied is composed of perforations provided between the surface on which the ground pattern is printed and the pressure-sensitive adhesive that can be re-adhered.

In addition, it has a surface coated with an adhesive on one side,
Having a surface coated with a release agent on the other side opposite to the one side,
Between the one side part and the other side part, on one side part side has a surface on which a tint block is printed,
Between the surface on which the tint block is printed and the surface on which the release agent is applied, the surface on which the tint block is printed and a re-adhesive adhesive is applied, and the surface on which a strong adhesive is applied And
The upper side of the surface on which the copy-forgery-inhibited pattern is printed and the adhesive which can be re-adhered is applied, that is, the date on which the adhesive is applied (FIGS. 2-5, 11-11) 13)) and having a surface on which the strong adhesive is applied,
It is preferable that perforations are provided between the surface to which the strong adhesive is applied and the surface to which the tint block is printed and the adhesive that can be re-adhered is applied.

In addition, it has a surface coated with an adhesive on one side,
Having a surface coated with a release agent on the other side opposite to the one side,
Between the one side part and the other side part, on one side part side has a surface on which a tint block is printed,
Between the surface on which the tint block is printed and the surface on which the release agent is applied, the surface on which the tint block is printed and a re-adhesive adhesive is applied, and the surface on which a strong adhesive is applied And
One where the date of the lower surface of the surface on which the copy-forgery-inhibited pattern is printed and the adhesive which can be re-adhered is applied, that is, the surface on which the adhesive is applied (FIGS. 2 to 5 and 11 to 11) 13)) and having a surface to which a strong adhesive is applied at the bottom,
It is preferable that perforations are provided between the surface to which the strong adhesive is applied and the surface to which the tint block is printed and the adhesive that can be re-adhered is applied.

In addition, it has a surface coated with an adhesive on one side,
Having a surface coated with a release agent on the other side opposite to the one side,
Between the one side part and the other side part, on one side part side has a surface on which a tint block is printed,
Between the surface on which the tint block is printed and the surface on which the release agent is applied, the surface on which the tint block is printed and a re-adhesive adhesive is applied, and the surface on which a strong adhesive is applied And
One where the upper and lower sides of the surface on which the copy-forgery-inhibited pattern is printed and the adhesive that can be re-adhered are applied, that is, the date on which the adhesive is applied (FIGS. 2 to 5 and FIG. 5) 11-13) with the upper and lower surfaces coated with strong adhesive, and the upper and lower surfaces coated with strong adhesive and the background pattern are printed and re-adhered. It is preferable that a perforation is provided between the surface to which the possible adhesive is applied.

  In addition, it is preferable to have a perforation between the surface on which the background pattern is printed and the surface on which the background pattern is printed and the adhesive which can be re-adhered is applied.

Further, the fluoroscopic and unauthorized opening prevention paper of the present invention,
One side has a surface coated with adhesive,
Having a surface coated with a release agent on the other side opposite to the one side,
Between the one side part and the other side part, on one side part side has a surface on which a tint block is printed,
Between the one side part and the other side part, the background pattern is printed on the side of the other side part, and has a surface coated with a re-adhesive adhesive,
A surface that has a color and a surface that is provided with a notch between the surface on which the adhesive is applied and the surface on which the tint block is printed;
The surface where the notch is provided at the interval is on the side of the surface where the adhesive is applied,
The colored surface is on the side where the tint block is printed,
The surface pattern is printed, and has a surface on which a strong adhesive is applied between a surface on which a re-adhesive adhesive is applied and a surface on which the release agent is applied,
The surface to which the strong pressure-sensitive adhesive is applied is composed of perforations provided between the surface on which the ground pattern is printed and the pressure-sensitive adhesive that can be re-adhered.

  Further, it is preferable that a perforation is provided between the surface on which the background pattern is printed and the surface on which the background pattern is printed and the adhesive which can be re-adhered is applied.

DESCRIPTION OF SYMBOLS 1,12 The surface where the adhesive is applied 2,13 The surface where the background pattern is printed 3,14 The surface where the background pattern is printed and the adhesive which can be re-adhered is applied 4,15 The release agent is applied Surface 5,21 Surface to which strong adhesive is applied 6,10,11,20,22,24 Perforation 7,23 Cutting portion 8, 9, 25, 26 Portion indicating opening 16 notch 17 notch provided Surface that has been applied 18 Surface that has been colored 19 Upper part of the surface on which the tint block is printed 27 Torn and stuck part 28 Part that remains after being torn

Claims (7)

A sheet of paper,
The surface (1) to which the adhesive is applied;
The surface (2) on which the background pattern is printed,
A surface (3) on which a tint block is printed and a re-adhesive adhesive is applied;
A surface (4) to which a release agent is applied, and
A surface (5) on which a strong adhesive is applied between a surface (3) on which the tint block is printed and a re-adhesive adhesive is applied, and a surface (4) on which the release agent is applied )
A perforation (6) is provided between the surface (5) to which the strong adhesive is applied and the surface (3) to which the surface pattern is printed and a re-adhesive adhesive is applied. This is a sheet for preventing see-through and tampering.   The surface (5) to which the strong adhesive is applied is provided on the surface (3) on which the tint block is printed and the re-adhesive adhesive is applied, and the strong adhesive is applied to the surface (5). 2. The see-through and tamper-evident sheet according to claim 1, wherein a perforation (10) is provided at a lower portion of the surface (5).   The surface (5) to which the strong adhesive is applied is provided below the surface (3) to which the tint block is printed and a re-adhesive adhesive is applied, and the strong adhesive is applied. The see-through and tamper-evident sheet according to claim 1, wherein a perforation (11) is provided on the upper surface (5).   The surface (5) to which the strong adhesive is applied is provided on the upper and lower sides of the surface (3) to which the tint block is printed and the adhesive which can be re-adhered is applied, and the strong adhesive is 2. The see-through and tamper-evident paper according to claim 1, wherein perforations (10, 11) are provided on the upper and lower portions of the coated surface (5). A sheet of paper,
The surface (12) to which the adhesive is applied;
The surface (13) on which the background pattern is printed,
A surface (14) on which a tint block is printed and a re-adhesive adhesive is applied;
It consists of a surface (15) on which a release agent is applied,
The surface (12) to which the adhesive is applied has a surface (17) provided with a notch (16) at an interval, and the surface (13) on which the ground pattern is printed is the notch. A surface (18) colored on the side in contact with the surface (17) provided with (16),
The surface (14) on which the copy-forgery-inhibited pattern is printed and the re-adhesive adhesive is applied is the surface (21) on which the strong adhesive is applied on the side (15) on which the release agent is applied. Have
A perforation (22) is provided between the surface (21) to which the strong adhesive is applied and the surface (14) to which the tint block is printed and a re-adhesive adhesive is applied. This is a sheet for preventing see-through and tampering.   There are perforations (20, 24) between the surface (3, 14) on which the tint block is printed and a re-adhesive adhesive is applied and the surface (2, 13) on which the tint block is printed. The see-through and unauthorized opening prevention paper according to claim 5. 6. The see-through and tamper-evident paper according to claim 1, wherein the see-through and tamper-evident paper is a postcard.

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