JPH10133582A - Unsealing preventive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discover illicit unsealing at the time of such action, to keep the data thereof recorded and to easily manufacture an unsealing preventive tape by forming conductive patterns which are easily disconnected in pulling and peeling in this unsealing preventive tape. SOLUTION: The unsealing preventive tape 1 has a laminated structure consisting of a primer layer 3 disposed on a stretchable base material sheet 2, the conductive patterns 4 disposed thereon, metallic pieces 5 for terminals connected to both ends thereof and an adhesive layer 6. The breaking elongation of the stretchable base material sheet 2 is specified to >=10%, more preferably >=30%. The spacings between the conductive particles of a conductive coating material constituting the conductive patterns 4 are sufficiently widened and the contact of the conductive particles with each other does not arise any more by increasing the elongating rate of the stretchable base materials sheet 2 and, therefore, the conductive patterns 4 are easily disconnected. The stretchable base material sheet 2 are peeled together with the conductive patterns 4 when the unsealing preventive tape 1 is pulled and peeled by the primer layer 3 and, therefore, the sure disconnection occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening prevention tape for preventing unauthorized opening of articles. More specifically, a tape to be adhered to an article to be prevented from being unsealed and to be adhered to the article, wherein the tape is adhered to the adherend and peeled off to form a circuit formed in the tape. The present invention relates to an anti-opening tape that allows disconnection and unauthorized opening to be electrically detected or recorded.

[0002]

2. Description of the Related Art Conventionally, in sealing containers and boxes,
In order to prevent unauthorized opening, perform safety management, and assure quality, adhesive tapes, which are also called opening prevention tapes, sealing tapes, sealing seals, opening prevention labels, and the like, are used.

The following types of opening prevention tapes are known.

First, as shown in FIG. 3, an opening prevention tape 30 is separated from a release paper 31, an adhesive layer 32, and a brittle film 3.
3 is formed from the laminated sheet and is arbitrarily printed on the brittle film 33. When sticking the opening prevention tape 30 to the adherend, the release paper 31 is peeled off, and the adhesive layer 32 is adhered to the adherend. This opening prevention tape 3
0, if it is to be peeled off after being once adhered to the adherend, the pressure-sensitive adhesive layer 32 has sufficient adhesive force to the adherend, so that it remains adhered to the adherend, The brittle film 33 itself has poor extensibility, low tensile strength,
As it is easy to cut, it can be torn quickly. Therefore, according to the opening prevention tape 30, the brittle film 3
3 will leave traces of opening due to the breakage of 3, making it impossible to imitate the unopened state after unauthorized opening,
Tampering is prevented.

Second, as shown in FIG. 4, an unsealing prevention tape 40 is also known as a laminated sheet of an extensible film base material 41 having a large elongation rate and a large residual strain and an adhesive layer 42. Have been. According to the unsealing prevention tape 40, since the extensible film base material 41 undergoes significant elongation deformation due to unauthorized opening, a trace of opening is left, and unauthorized opening is prevented (Japanese Patent Publication No. 63-32388).

Third, as shown in FIG. 5, the tape 50 for opening prevention is externally bonded to a tape-like sheet 51, an internal adhesive layer 52, a pattern ink layer 53, and a direct adhesive layer to an adherend. The internal adhesive layer 52
Between the ink layer 53 and the pattern ink layer 53
Also known are those provided with. This opening prevention tape 50
Then, depending on whether or not the ink-repellent portion 55 is formed, the internal adhesive layer 52 or the external adhesive layer 54 of the pattern ink layer 53 is determined.
Since there is a difference in adhesive strength with respect to the opening prevention tape 50,
Is adhered to an adherend using the external adhesive layer 54 as an adhering surface, and when this is to be peeled off, the ink repellent portion 55
The pattern ink layer 53 remains on the adherend side in the portion where is formed, but is easily peeled off on the tape-like sheet 51 side in the portion where the ink-repellent portion 55 is not formed, and the pattern of the pattern ink layer 53 is large. Crumble. Accordingly, this leaves traces of unauthorized opening, and prevents unauthorized opening (Japanese Patent Publication No. 5-33398).

[0007] Fourth, as shown in FIG. 6A, the sealing seal 60 is made of an adhesive material 61 which forms a surface to be adhered to an object to be sealed.
A region having a laminated structure of the linear conductive member 62, the adhesive 61, and the band-shaped seal base 63, and the adjacent strength of the pair of adhesives 61 sandwiching the conductive member 62, relative to the conductive member 62. What is reversed every time is known. That is, in the region A, the sealed object side is made of the adhesive material 61s having strong adhesive force, and the seal base 63 side is made of the adhesive material 61w having weak adhesive force. And a region B adjacent to this region A
Then, the sealed object side is made of an adhesive material 61w having a low adhesive strength, the seal base 63 side is made of an adhesive 61s having a strong adhesive force, and further, in a region C adjacent to the region B, the sealed object side has a strong adhesive force. The adhesive material 61s is used, and the seal substrate 63 side is used as an adhesive material 61w having a low adhesive strength. In this way, the relative strength of the adhesive forces of the opposing adhesive materials is made opposite to each other in adjacent regions.

When the seal 60 is peeled off after the seal 60 is adhered to an object to be sealed, the adhesive material 61w having a low adhesive strength is peeled off in each region, and FIG.
As shown in (b), the conductive member 62 is alternately separated and separated into the seal base side and the sealed object side.
Therefore, it is possible to electrically detect the opening of the sealing seal 60 (Japanese Patent Laid-Open No. Hei 8-221676).

[0009]

However, FIGS.
In the conventional anti-opening tape shown in FIG. 5, although the fact of unauthorized opening can be found after the unauthorized opening, it cannot be found and dealt with at the time of the unauthorized opening, and the date and time of the unauthorized opening is set. I can't keep a record.

[0010] For this reason, unauthorized opening cannot be practically prevented, and social problems are caused.

For example, a pachinko machine or a device generally called a pachislot is provided with a box for storing a ROM for determining the probability of a ball coming out and an accompanying IC. If this ROM is illegally exchanged by pachinko parlors and customers and the probability of winning is adjusted without permission, it leads to a crime. Therefore, in order to prevent unauthorized replacement of the ROM, a seal for preventing unauthorized opening is attached to the opening of the box. However, since the sealing seal can be peeled off relatively easily, the fact is that it is no longer possible to reliably prevent unauthorized ROM replacement.

On the other hand, in the conventional sealing seal shown in FIG. 6, unauthorized opening can be electrically detected and recorded, but the conductive member 62 made of a pair of adhesives sandwiching the conductive member 62 is used. Since the magnitude of the adhesive force to the adhesive must be reversed for each adjacent region, the configuration of the adhesive 61 becomes complicated, and there is a problem in that the design and forming work of the adhesive 61 is troublesome. Also, when opening the opening prevention tape,
Opening prevention so that peeling occurs at the adhesive interface between the pressure-sensitive adhesive material 61 adhered to the sealed object and the sealed object, or breakage occurs in the layer of the adhesive material adhered to the sealed object. When the tape is peeled off, there is also a problem that the conductive member 62 is not divided and the opening is not detected.

An object of the present invention is to solve the above-mentioned problems of the prior art, and it is possible to reliably detect an unauthorized opening at the time of the unauthorized opening, and to record the date and time of the unauthorized opening. An object of the present invention is to provide an unsealing prevention tape which can be kept and can be easily manufactured.

[0014]

Means for Solving the Problems The present inventors have found that the above object can be achieved by forming a conductive pattern in an opening prevention tape which is easily disconnected when the tape is peeled off. The present invention has been completed.

That is, according to the present invention, the elongation at break is 10%.
An anti-opening tape having a laminated structure including the above-described extensible base sheet, a conductive pattern formed from a conductive paint, and an adhesive layer is provided. In particular, as a preferred embodiment, the elongation at break of the extensible base sheet is 300
% Or more and an embodiment having a primer layer between the extensible base sheet and the conductive pattern, which enhances the adhesive strength between them.

According to the anti-opening tape of the present invention, since the conductive pattern is formed on the extensible base sheet, the anti-opening tape is adhered to the adherend from the adhesive layer side and then peeled off. Then, the extensible base sheet elongates,
As a result, contact between the conductive particles of the conductive paint constituting the conductive pattern is not maintained, or the distance between the particles is increased, and the conductive pattern is reliably disconnected. Therefore, by connecting the conductive pattern to an alarm device or a monitoring system, it is possible to cope with unauthorized opening at the time of unauthorized opening, and by connecting the conductive pattern to a recording device, the unauthorized opening operation can be performed. It is also possible to record the date and time when the message was sent.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view (FIG. 1 (a)) and a cross-sectional view (FIG. 1 (b)) of one embodiment of the unsealing prevention tape of the present invention.

The opening prevention tape 1 is connected to an extensible base sheet 2, a primer layer 3 provided on the extensible base sheet 2, a conductive pattern 4 provided thereon, and both ends of the conductive pattern 4. And a laminated structure of a terminal metal piece 5 and an adhesive layer 6 that adheres to an adherend.

Here, the extensible base sheet 2 is composed of a sheet having a high elongation ratio with respect to the conductive pattern 4. When the elongation percentage of the extensible base sheet 2 is low, when the opening prevention tape 1 attached to the adherend is peeled off, the distance between the conductive particles of the conductive paint constituting the conductive pattern 4 is reduced. Does not spread sufficiently, so that the conductive pattern 4 is hardly broken. However, by increasing the elongation rate of the extensible base sheet 2, the distance between the conductive particles of the conductive paint constituting the conductive pattern 4 is reduced. Are sufficiently spread, and the conductive particles do not contact each other, so that the conductive pattern 4 is easily broken.

As specific numerical values of the elongation percentage of the extensible base material sheet 2, the elongation at break (ASTM D882-61T)
10% or more, preferably 300% or more. In addition, as the extensible base sheet 2, a sheet to which particles such as fillers are added can be used. In this case, the elongation percentage of the sheet containing the particles such as fillers falls within the above range. Preferably.

Examples of the extensible base sheet that can be preferably used in the present invention include, for example, cellulose triacetate (elongation at break: about 40%), ethylene vinyl acetate copolymer (EVA) (elongation at break: about 6%).
50-900%), biaxially oriented polypropylene (elongation at break about 100%), high density polyethylene (elongation at break about 1%)
0-70%).

The thickness of the extensible base sheet 2 is such that the conductive pattern 4 can be easily adhered to an adherend, and the conductive pattern 4 can be easily formed when the extensible base sheet 2 is pulled when the opening prevention tape 1 is peeled off. It is preferable that the thickness be about 5 to 30 μm so as to cause disconnection.

As shown, an application tape 8 can be provided on the extensible base sheet 2 as required, from the viewpoint of workability at the time of sticking. As such an application tape 8, for example, paper, a plastic sheet, or the like can be used.

In the present invention, the primer layer 3 is a layer provided as needed to improve the adhesion between the extensible base sheet 2 and the conductive pattern 4 when the adhesion is not sufficient. By forming the primer layer 3,
When the anti-opening tape 1 attached to the adherend is peeled off, the extensible base sheet 2 can be prevented from being separated from the conductive pattern 4 and peeled off alone, and can be peeled off together with the conductive pattern 4. Then, the conductive pattern 4 is surely disconnected.

The constituent material of the primer layer 3 can be appropriately selected according to the constituent materials of the extensible base sheet 2, the conductive pattern 4, the adhesive layer 6, and the like. A transparent or colored paint such as an acrylic or urethane paint can be used.

The primer layer 3 can be formed in an arbitrary pattern on the extensible base sheet 2 using a coater or by printing. In this case, the pattern of the primer layer 3 may be solid, but the adhesive force between the extensible base sheet 2 and the conductive pattern 4 has a strong and weak distribution, and the unsealing prevention tape 1 adhered to the adherend. To form a portion where the conductive pattern 4 is easily broken when
It is preferably formed in a pattern other than solid, and it is usually preferable to form the pattern in a non-continuous pattern in the longitudinal direction of the unsealing prevention tape.

The optimum pattern for forming the primer layer 3 differs according to the adhesion between the primer layer 3 and the conductive pattern 4 and the adhesion between the extensible base sheet 2 and the conductive pattern 4. In the case of a striped pattern as described above, it is generally preferable to use a striped pattern having a width of 1 mm or more and an interval of 1 mm or more. In addition, as a pattern for forming the primer layer 3, a scientific symbol such as zebra, W, X, ≧, ≧, *, *
General symbols such as! ,:, Etc., control symbols, parentheses, etc. can be used. In addition, the primer layer 3
As for the handle, against the unauthorized opening of the opening prevention tape 1,
It is preferable that the conductive pattern 4 has a complicated pattern in order to prevent the breakage of the conductive pattern 4 when the opening prevention tape 1 is pulled.

The area ratio of the primer layer 3 to the extensible base sheet 2 is preferably 5 to 90% from the viewpoint of the overlap between the primer layer 3 and the conductive pattern 4. 5
%, The primer layer 3 and the conductive pattern 4 may not overlap depending on the design of the primer layer 3. On the other hand, if it exceeds 90%, the direct bonding area between the conductive pattern 4 and the extensible base sheet 2 is too small, and the adhesion between the conductive pattern 4 and the extensible base sheet 2 due to the formation of the primer layer 3. It is difficult to have a strong and weak distribution.

On the other hand, in the present invention, the conductive pattern 4 is formed from a conductive paint composed of conductive particles and a binder. Thereby, when the extensible base sheet 2 is stretched when the opening prevention tape 1 is peeled off,
Non-contact portions are generated between the conductive particles constituting the conductive pattern, and the conductive pattern 4 can be disconnected. Such a conductive paint is not particularly limited as long as it is formed from conductive particles. For example, a silver paste,
Carbon paste or the like can be used.

The pattern shape of the conductive pattern 4 is as follows:
In order to surely break the wire when the opening prevention tape 1 is peeled off, it is preferable to form a pattern that is elongated in the direction in which the extensible base sheet 2 is stretched when the opening prevention tape 1 is peeled off. The opening prevention tape 1 has a belt-like pattern extending in the longitudinal direction.

The method for forming the conductive pattern 4 into the desired pattern is not particularly limited, and it can be performed by applying a conductive paint using a coater, printing, or the like.

The conductive pattern 4 can be connected to any alarm device, a monitoring system, a recording device for opening date and time, etc. which are activated by the disconnection. For convenience of connection with these devices, the end of the conductive pattern 4 can be connected. The terminal metal piece 5 can be connected as shown in FIG.

The adhesive layer 6 serving as a contact surface when the opening prevention tape 1 is adhered to an adherend is made of an arbitrary adhesive as long as the adhesive layer 6 adheres to the adherend using the opening prevention tape 1. Can be. For example, when the adherend is made of a plastic box such as styrene resin or polycarbonate, or a metal box such as iron or copper, the adhesive layer 6 can be formed of an acrylic or synthetic rubber adhesive.

Further, in view of the convenience of storage, transportation and use of the opening prevention tape 1, if necessary, the opening prevention tape 1 can be easily attached to the adherend on the adhesive layer 6. A peelable layer or a protective layer 7 that can be peeled off may be provided. Such release layer or protective layer 7
Examples thereof include silicone-coated paper and polyethylene sheet.

The above-described opening prevention tape shown in FIG. 1 can be used for sealing various containers and boxes for safety management and quality assurance. For example, a ROM for determining the probability of a pachinko or pachislot ball coming out can be used. It can be preferably used for sealing a plastic case housed therein.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments.

Example 1 The opening prevention tape of the example was manufactured as follows. FIG. 2 shows a manufacturing process in this case.

As the extensible base sheet 2, a release paper portion 2a
And an adhesive tape (NP608, manufactured by Sony Chemical Co., Ltd.) comprising the double-sided adhesive portion 2b. This adhesive tape is E
It is a VA type heat-adhesive dry type non-supported double-sided adhesive tape, and the thickness of the tape is 50 to 60 μm.
The breaking elongation (ASTM.D882-61T) was about 400%.

Next, an adhesive tape (extensible base sheet) 2
Of polyester 3 made by Unitika Ltd.
Silk screen printing of 500 transparent inks,
A primer layer 3 having a stripe pattern having a stripe extending to a length of 20 mm over the entire width of the opening prevention tape was formed.
10 μm) (FIG. 2 (a)).

Next, a conductive paste (FA303, manufactured by Fujikura Kasei Co., Ltd.) was printed on the adhesive portion 2b of the adhesive tape 2 on which the primer layer 3 was formed, and the conductive pattern shown in FIG. A similar pattern with a width of 1.5 mm
The conductive line of the opening prevention tape extends in the longitudinal direction of the tape of the opening prevention tape, is bent plural times every 155 mm, and has a striped pattern within a width of 20 mm of the opening prevention tape. To 10 μm) (FIG. 2B).

Next, the tape was cut so as to include the above-mentioned conductive pattern 4 to obtain an outer shape of an opening prevention tape having a width of 22 mm and a length of 160 mm. Solder terminals (metal pieces for terminals) 5 are provided on both ends of the conductive pattern 4 of the sheet as CU7635R manufactured by Sony Chemical Corporation.
(FIG. 2 (c)). This CU7635R is made of a copper foil having a thickness of 35 μm manufactured by a rolling method and a conductive adhesive of 45 μm.
５５55 μm.

Next, as the adhesive layer 6 to the adherend and the release layer 7 thereon, NP203 manufactured by Sony Chemical Co., Ltd.
Was laminated (FIG. 2D). This NP203 is an acrylic dry type non-supported double-sided adhesive tape (tape thickness: 40 to 50 μm), in which a silicone-coated paper is integrated as a release layer.

The electrical resistance between the terminals of the conductive pattern 4 of the obtained opening prevention tape 1 was 10 to 25 Ω / cm.

The opening prevention tape 1 was attached to a styrene box with the adhesive layer 6 as an attachment surface. Then, the user tried to peel off the opening prevention tape 1 while measuring the inter-terminal resistance of the conductive pattern 4. As a result, when the opening prevention tape 1 was peeled off by about 5 mm, the conductive pattern 4 was broken at a portion within 3 mm from the terminal 5 due to the extension of the extensible base sheet 2.

[0046]

According to the present invention, since a conductive pattern made of a conductive paint is formed on a base sheet having a high elongation, this anti-opening tape is adhered to an adherend, and then this is peeled off. Then, the base sheet elongates, whereby the contact between the conductive particles constituting the conductive pattern is lost, and the conductive pattern surely becomes disconnected. Therefore, by connecting the conductive pattern to an alarm device, a monitoring system, a recording device, and the like, it becomes possible to cope with an unauthorized opening of the adherend to which the anti-opening tape is attached, in the event of an unauthorized opening, It is also possible to record the date and time of unauthorized opening.

According to the opening prevention tape of the present invention,
A configuration in which the magnitude of the adhesive force of the pair of adhesives sandwiching the conductive pattern at the top and bottom with respect to the conductive pattern is not required to be reversed for each adjacent region is possible, and the device can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view (FIG. 1A) and a cross-sectional view (FIG. 1B) of an opening prevention tape of the present invention.

FIG. 2 is an explanatory diagram of a manufacturing process of the unsealing prevention tape of the example.

FIG. 3 is a sectional view of a conventional opening prevention tape.

FIG. 4 is a sectional view of a conventional opening prevention tape.

FIG. 5 is a cross-sectional view of a conventional opening prevention tape.

FIG. 6 is a sectional view of a conventional opening prevention tape (FIG. 6A).
And an explanatory diagram at the time of opening the same (FIG. (B)).

[Explanation of symbols]

1 ... opening prevention tape, 2 ... extensible base sheet, 3 ...
Primer layer, 4: conductive pattern, 5: metal piece for terminal, 6: adhesive layer

Claims (7)

[Claims] 1. An anti-opening tape having a laminated structure comprising an extensible base sheet having an elongation at break of 10% or more, a conductive pattern formed from a conductive paint, and an adhesive layer. 2. The extensible base sheet has a breaking elongation of 300.
%. 3. The anti-sealing tape according to claim 1, wherein a primer layer for increasing the adhesive strength between the extensible base sheet and the conductive pattern is formed. 4. The anti-opening tape according to claim 3, wherein the primer layer is formed in a discontinuous pattern in the longitudinal direction of the anti-opening tape. 5. The anti-opening tape according to claim 3, wherein the area ratio of the primer layer to the extensible base sheet is 5 to 90%. 6. The anti-opening tape according to claim 1, wherein the conductive pattern is formed in a belt shape extending in the longitudinal direction of the anti-opening tape. 7. The unsealing prevention tape according to claim 1, wherein a terminal metal piece is connected to an end of the conductive pattern.