JP6735646B2 - Adhesive tape roll - Google Patents

Description

The present invention relates to an adhesive tape roll. More specifically, it is an adhesive tape that is attached to close the opening of a box or bag, and it is easy to determine that the tape was peeled off from the adherend due to the letters floating on the tape base material. The present invention relates to an adhesive tape roll formed by winding a tamper-proof adhesive tape.

As the tamper-proof adhesive tape, there are known tapes that leave a trace on an adherend upon peeling, tapes that break due to a brittle base material, and tapes that cause delamination of the tape.

Among them, the tamper-proof adhesive tape that causes delamination can be delaminated in a multi-layer laminated adhesive tape, and has various variations in tamper-proof function. When provided as an adhesive tape roll, in principle, it is necessary to weaken the rewinding force when rewinding the tape so that delamination, which is a tampering prevention function, does not appear when the tape is rewound. Has been. For example, Patent Document 1 describes that a release layer that contains silicone is provided on the surface of a base material that comes into contact with the adhesive layer when the adhesive tape is wound in a tubular shape to reduce the unwinding force.

Further, regarding the setting of the peeling force between the peelable layers, as long as it is a label that is not provided by winding an adhesive tape, for example, as described in Patent Document 2, the release paper and the adhesive layer are described. And the adhesive strength between layers that exhibit the tamper-proof function, and the adhesive strength between the adherend and the adhesive layer should be set higher than the adhesive strength between the layers that exhibit the tamper-proof function. Can be done. However, in the state in which the adhesive tape is wrapped around the tubular body and provided, it is difficult to set the peeling force between the layers that can be peeled off, and thus it has not been conventionally studied.

Most of the commercially available tamper-proof adhesive tape rolls use the above-mentioned silicone, and in the form of a tape roll wrapped around the tube instead of the label, the tamper-proof function at the time of rewinding unless silicone is used. It has been regarded as technically difficult to prevent the occurrence of. However, when silicone is used for an adhesive tape, it is necessary to undergo a harsh process such as heat treatment, and the material used for the tape is limited to one having heat resistance. Therefore, the mainstream of the tamper-proof adhesive tape is to combine heat resistant paper, polyethylene terephthalate (PET), and the like with silicone, and it has never been possible to see one that does not use silicone. Further, since silicone and heat treatment are costly, there is a problem that the tamper-proof adhesive tape is generally inevitably expensive as compared with a normal tape.

JP, 2016-56339, A JP-A-7-234634

In view of the above problems, the present invention winds a tamper-proof adhesive tape that can suppress the manufacturing cost by not using silicone and can suppress delamination when the adhesive tape is rewound. The present invention aims to provide a pressure-sensitive adhesive tape roll.

The present invention is a pressure-sensitive adhesive tape roll, a translucent base material, a first colored layer that is laminated on a part of one surface of the base material, and includes a first coloring material and a thermoplastic elastomer, and a base material. It is laminated so as to cover the first colored layer on one surface, comprises a second colored layer containing the second coloring material, and an adhesive layer laminated on the second colored layer and containing a resin, and the adhesive layer side is adhered. A pressure-sensitive adhesive tape formed by winding a tamper-proof pressure-sensitive adhesive tape that is peelable at an interface between an upper layer having a base material and a first colored layer and a lower layer having a second colored layer and an adhesive layer in a state of being adhered to a body. At least one surface of the base material is a roll, and the peeling force, which is a force required to continue peeling by pulling the end portion of the upper layer peeled from the lower layer, is 300 mm/min. It is smaller than the low-speed rewinding force when the tape is rewound at a pulling speed, and the breaking force, which is the force required to break the upper layer that has not been peeled from the lower layer and create a trigger for peeling from the lower layer, is low. It is characterized by being larger than the rewinding force.

ADVANTAGE OF THE INVENTION According to this invention, the adhesive tape roll which wound the tampering prevention adhesive tape which can suppress manufacturing cost by not using silicone, and can suppress delamination at the time of rewinding an adhesive tape. realizable.

FIG. 1 is a cross-sectional view in the width direction showing an example of the tampering prevention adhesive tape according to the embodiment. FIG. 2 is a plan view showing an example of the tampering prevention adhesive tape after the tampering prevention function according to the embodiment has been developed. FIG. 3 is a cross-sectional view in the width direction showing a modified example of the tampering prevention adhesive tape. FIG. 4 is a cross-sectional view in the width direction showing the tampering-preventive pressure-sensitive adhesive tape shown in FIG. 1, showing a state in which the tape is separated between the upper layer and the lower layer.

Hereinafter, an example of an adhesive tape roll formed by winding the tamperproof adhesive tape of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

(First embodiment)
FIG. 1 is a cross-sectional view in the width direction showing an example of the tampering prevention adhesive tape according to the embodiment. Here, the width direction means a direction orthogonal to the rewinding direction of the tampering prevention adhesive tape. The tamper-proof adhesive tape 1 shown in FIG. 1 is a part of the adhesive tape unwound from an adhesive tape roll formed by winding the tamper-proof tape. The tampering prevention adhesive tape 1 is laminated on a base material 2, a first colored layer 3 laminated on a part of one surface of the base material 2, and on one surface of the base material 2 so as to cover the first colored layer. The second colored layer 4 and the adhesive layer 5 laminated on the second colored layer 4. The tampering prevention adhesive tape 1 is composed of an upper layer 6 having a base material 2 and a first colored layer 3 and a lower layer 7 having a second colored layer 4 and an adhesive layer 5. The tamper-proof adhesive tape 1 can be peeled off at the interface between the upper layer 6 and the lower layer 7, with the adhesive layer 5 side adhered to the adherend.

The base material 2 is translucent, and at least the surface thereof on the side of the first colored layer and the second colored layer is matted. Examples of the base material 2 include polyethylene resin, polypropylene resin, polyurethane resin, polyamide resin, ethylene/vinyl acetate copolymer resin, polyester resin, polyvinyl alcohol resin, polyacrylate resin, polycarbonate resin, fluorine-containing copolymer resin, polystyrene. It is composed of a thermoplastic resin such as resin. Of these, a biaxially oriented polypropylene (OPP) film, which has particularly high tensile strength and excellent transparency by biaxial stretching, is preferable as a substrate. The thickness of the base material 2 is 20 μm or more and 80 μm or less, and preferably 30 μm or more and 50 μm or less.

At least one surface of the base material 2 is matted by, for example, sand matting, etching, or embossing. The surface roughness Ra of the matte-processed surface of the base material 2 is preferably 0.2 μm or more and 1.2 μm or less. Although details will be described later, by performing mat processing, it is possible to increase the physical bond (intermolecular force) between the base material 2 and the second colored layer 4.

When the tampering prevention adhesive tape 1 attached to the adherend is to be peeled off, the upper layer 6 is peeled off from the lower layer 7. That is, the first colored layer 3 is separated from the lower layer 7 along with the base material 2. At this time, since the base material 2 is semitransparent, the first colored layer 3 can be visually recognized through the peeled base material 2. After the upper layer 6 and the lower layer 7 are peeled off, even if the upper layer 6 and the lower layer 7 are overlapped again, the color tone of the first colored layer 3 and the second colored layer 4 is not changed because the base material 2 is translucent. Looks different. As a result, the visibility of the first colored layer 3 is maintained. When the base material 2 is transparent, it may be difficult for the difference in color tone between the first colored layer 3 and the second colored layer 4 to occur, and therefore it is preferable to use a semitransparent base material. Since the first colored layer 3 needs to be seen through the base material 2, the base material 2 is preferably colorless or has a color having a slight color tone.

The first colored layer 3 includes a first colored material and a thermoplastic elastomer. The first colored layer 3 has a first colored material of 10 parts by weight or more and 50 parts by weight or less and a thermoplastic elastomer of 50 parts by weight or more and 90 parts by weight when the entire first colored layer 3 is 100 parts by weight. The amount of the first coloring material is 25 parts by weight or more and 35 parts by weight or less, and the thermoplastic elastomer is 65 parts by weight or more and 75 parts by weight or less. The first coloring material is not particularly limited, and examples thereof include conventionally known pigments. However, in order to make the display that occurs during confirmation of opening more clearly visible, use a material with high saturation. Is preferred. The thickness of the first colored layer 3 is preferably 1 μm or more and 5 μm or less, and more preferably 1 μm or more and 2 μm or less.

The second colored layer 4 contains a second colored material and a curing agent. The second coloring layer 4 contains 80 parts by weight or more and 99 parts by weight or less of the second coloring material and 1 part by weight or more and 20 parts by weight or less of the curing agent when the entire second coloring layer 4 is 100 parts by weight. Is. Examples of the second coloring material include urethane/vinyl chloride ink. The second colored layer 4 has the same color as the first colored layer 3. Therefore, before peeling between the upper layer 6 and the lower layer 7, it is difficult to recognize the boundary between the first colored layer 3 and the second colored layer 4, and the tampering-preventive adhesive tape 1 is applied from the base material 2 side. Even when viewed, the display of characters and the like derived from the first colored layer 3 is hidden. In addition, when the upper layer 6 is peeled from the lower layer 7, a thin air layer is generated between the upper layer 6 and the lower layer 7, so that the base material 2 appears clouded in a light gray color due to irregular reflection of light due to mat processing. The display of characters and the like derived from the first colored layer 3 becomes transparent for the first time.

Examples of the curing agent include isocyanate-based/chelate-based/epoxy-based curing agents, and preferably isocyanate-based crosslinking agents. The thickness of the second colored layer 4 is preferably 2 μm or more and 10 μm or less, and more preferably 4 μm or more and 7 μm or less.

The adhesive layer 5 is composed of a composition in which 0.5 part by weight or more and 10 parts by weight or less of a crosslinking agent is added to 100 parts by weight of a resin to be crosslinked. Preferably, 1 part by weight or more and 3 parts by weight of the crosslinking agent is added to 100 parts by weight of the adhesive resin. For the adhesive layer 5, any of acrylic, rubber, urethane, and silicone resins can be used, but acrylic resins are preferable because they have weather resistance and durability and are inexpensive.

In order to make the tamper-proof adhesive tape 1 a highly versatile adhesive tape, it is preferable that the adhesive force of the adhesive layer 5 is large. Further, the adhesive force of the adhesive layer 5 contributes to the rewinding force of the tampering prevention adhesive tape 1. Further, in order not to require an excessively large force for peeling between the upper layer 6 and the lower layer 7, it is preferable that the peeling force between the upper layer 6 and the lower layer 7 is small. Therefore, the tampering prevention tape 1 has, as an example of a suitable design, a peeling force which is a force required to pull the end portion of the upper layer 6 peeled from the lower layer 7 and continue peeling from the lower layer 7 to 300 mm/ It is smaller than the low speed rewinding force when the tampering prevention adhesive tape is rewound at a speed of min. The peeling force between the upper layer 6 and the lower layer 7 is preferably 0.01 N/10 mm or more and less than 0.4 N/10 mm. The low speed rewinding force is preferably 0.4 N/10 mm or more and less than 3.0 N/10 mm, more preferably 0.5 N/10 mm or more and 1.5 N/10 mm or less.

The tamper-proof adhesive tape 1 must not be peeled off between the upper layer 6 and the lower layer 7 when the tamper-proof adhesive tape 1 is rewound. Therefore, as an example of a suitable design, the tampering prevention tape 1 has a breaking force, which is a force required to break the upper layer 6 that has not been peeled from the lower layer 7 to create a trigger for peeling from the lower layer 7, at a low speed. Greater than the return force. This is due to the physical bond (intermolecular force) between the base material 2 and the second colored layer 4, the second colored layer 4 gets wet on the uneven surface of the matte processing of the base material 2, and the surface of the base material 2 is free. It is considered that the energy is lowered and stabilized, and at the same time, the intermolecular force is increased by increasing the contact area. The breaking force is substantially the same as the force required when the tape actually attached to the adherend is peeled by a human hand, and is preferably 3.0 N/10 mm or more and 20.0 N/10 mm or less, and 6. It is more preferably 0 N/10 mm or more and 14.0 N/10 mm or less.

FIG. 2 is a plan view showing an example of the tampering prevention adhesive tape after the tampering prevention function according to the embodiment has been developed. As described above, the tamperproof pressure-sensitive adhesive tape 1 can be peeled off at the interface between the upper layer 6 and the lower layer 7 with the pressure-sensitive adhesive layer 5 side adhered to the adherend. As shown in FIG. 2, in the upper layer 6, the first colored layer 3 accompanies the base material 2 and the letters “VOID” derived from the first colored layer 3 are transparent, so that the letters “VOID” can be visually recognized. Is possible. Note that the characters that can be visually recognized by the expression of the tampering prevention function are not limited to “VOID”, and may be, for example, “OPEN” or “opened”, or may be a simple symbol instead of a character. On the other hand, although not shown, the second colored layer 4 remains on the lower layer 7 leaving traces of the first colored layer 3.

Here, in the state of peeling at the interface between the upper layer 6 and the lower layer 7, the lower layer 7 side of the upper layer 6 does not have adhesive force, and the upper layer 6 side of the lower layer 7 also does not have adhesive force. .. Therefore, after peeling at the interface between the upper layer 6 and the lower layer 7, the upper layer 6 and the lower layer 7 cannot be brought into contact with each other again to restore the state before the peeling of the upper layer 6 and the lower layer 7. Due to this, the tampering prevention adhesive tape 1 also has a function of preventing tampering.

Furthermore, the lower layer 7 remaining on the adherend has no strength because it has no base material. Therefore, when a person having the opening authority tries to open the lower layer 7, the lower layer 7 can be broken or peeled without using a tool such as a cutter or scissors after peeling the upper layer 6 from the adherend. As a result, it becomes possible to easily open it by hand.

(Modification)
FIG. 3 is a cross-sectional view in the width direction showing a modified example of the tampering prevention adhesive tape. For the tampering prevention according to the first embodiment, only the second colored layer 4 in the tampering prevention adhesive tape 1 further has a third colored layer 8 in a portion facing the first colored layer 3. Different from adhesive tape. The tampering prevention pressure-sensitive adhesive tape 1 according to the modified example is composed of an upper layer 6 having a base material 2 and a first colored layer 3, and a lower layer 7 having a second colored layer 4, a third colored layer 8 and an adhesive layer 5. It The tamper-proof adhesive tape 1 can be peeled off at the interface between the upper layer 6 and the lower layer 7, with the adhesive layer 5 side adhered to the adherend.

The third colored layer 8 contains a fluorescent material that emits fluorescence by ultraviolet rays having a wavelength of 360 nm or more and 390 nm or less. The fluorescent material is not particularly limited, and for example, a conventionally known organic fluorescent pigment can be used. Since the third colored layer 8 includes a fluorescent material that emits fluorescence by ultraviolet rays having a wavelength of 360 nm or more and 390 nm or less, black light is applied to the lower layer 7 remaining on the adherend after peeling between the upper layer 6 and the lower layer 7. When irradiated, the third colored layer 8 of the lower layer 7 emits light. Therefore, it is possible to confirm the effect of tampering prevention.

As a further modification of the first embodiment, a colored base material is used as the base material 2, and the second colored layer 4 further contains a fluorescent material that emits fluorescence by ultraviolet rays having a wavelength of 360 nm or more and 390 nm or less. It may be configured.

The tampering prevention adhesive tape 1 may be provided with a surface layer on the surface of the base material 2 opposite to the first colored layer 3 and the second colored layer 4 sides. Further, the tampering prevention adhesive tape 1 may be subjected to a surface treatment such as a release treatment (mold release treatment) on the surface of the base material 2 opposite to the first colored layer 3 and the second colored layer 4 side. ..

Further, the tamper-proof adhesive tape 1 holds the tamper-proof adhesive tape 1 when pulling out the tamper-proof adhesive tape 1 in a certain area of both ends in the width direction of the tamper-proof adhesive tape 1 in the adhesive layer 5. In order to facilitate the operation, a non-adhesive portion may be provided.

In addition, the tamper-proof pressure-sensitive adhesive tape 1 can be subjected to inkjet printing, thermal transfer printing, and thermal printing by treating the outermost surface with corona discharge, an easy-adhesion coating, a thermal ink coating, or the like. Further, it is possible to make a cut in the tampering prevention adhesive tape 1 by perforation processing or the like.

Next, a method of using the adhesive tape roll wound with the tamper-proof adhesive tape 1 will be described. First, the end portion of the tampering prevention adhesive tape 1 is grasped, pulled out from the adhesive tape roll by a necessary amount, and attached to the adherend so that the adhesive surface side of the tampering prevention adhesive tape 1 is entirely covered. The end portion of the tampering prevention adhesive tape 1 is gripped while the tampering prevention pressure-sensitive adhesive tape 1 is attached to the adherend, and the end portion of the tampering prevention pressure-sensitive adhesive tape 1 gripped is peeled from the adherend. At this time, as shown in FIG. 4, the tampering prevention adhesive tape 1 is peeled off at the interface between the upper layer 6 and the lower layer 7. That is, only the first colored layer 3 accompanies the base material 2, and the second colored layer 4 remains on the adherend leaving traces of the first colored layer 3. Here, in FIG. 4, the tamperproof adhesive tape 1 is peeled from one end to the other end in the width direction between the upper layer 6 and the lower layer 7, but the peeling direction is tamperproof adhesive tape. It is not limited to the direction from one end to the other end in the width direction of 1, and may be the direction from one end to the other end in the rewinding direction of the tampering prevention adhesive tape 1, and may be any direction. As a result, characters and the like derived from the first colored layer 3 can be seen through the base material 2. Since the base material 2 is translucent, it is possible to easily visually recognize the floating characters from any direction of the base material, and as a result, when a third party who does not have an opening authority tries to peel off the tape, Since the characters are clearly floated on the base material 2, the third person has an effect of hesitating to peel off the tampering prevention adhesive tape 1 any more.

The adhesive tape roll around which the tamper-proof adhesive tape of the present invention is wound does not use silicone, which is expensive to manufacture, and therefore can be produced at low cost. Therefore, it can be used in a field where the use of the tamper-proof adhesive tape has been abandoned for cost reasons.

Further, in the conventional tamper-proof adhesive tape using silicone, it is relatively easy to weaken the peeling force when the tape is rewound due to the lubricating action of silicone. Therefore, the peeling force between the layer that accompanies the base material and the layer that remains on the adherend may not be sufficiently large, and the environment under high temperature and high humidity that may occur everyday, or the environment where slight vibration is applied. Then, even before the intended tampering prevention function manifestation, peeling may occur between the layer accompanying the substrate and the layer remaining on the adherend, and the tampering prevention function may be exhibited. On the other hand, the adhesive tape roll around which the tamper-proof adhesive tape of the present invention is wound does not use a silicone lubricant, and the base material and the second colored layer on which the peeling force between the upper layer and the lower layer is matted. Since it is increased by physical bond (intermolecular force) with, suppresses the expression of the tampering prevention function due to the separation between the upper layer and the lower layer in the stage before the intended tampering prevention function expression in the environment that can occur everyday. It becomes possible.

Further, in the pressure-sensitive adhesive tape roll wound with the tamperproof pressure-sensitive adhesive tape of the present invention, the peeling force between the upper layer and the lower layer is increased by the intermolecular force between the base material subjected to the mat processing and the second colored layer. Therefore, it is possible to select a tape having a relatively high adhesive strength of the adhesive layer. Therefore, the tamper-proof adhesive tape of the present invention can be attached to an adherend such as a bag having a low polarity, which is relatively difficult to attach the tape, and thus can provide a highly versatile tape. It will be possible.

In addition, since the tamper-proof adhesive tape of the present invention has the tamper-proof adhesive tape wound with no silicone used for the tamper-proof adhesive tape, it is not necessary to select a base material that can withstand heat treatment and the like. Therefore, the range of selection of the base material can be expanded.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

<Example>
A long-chain alkyl pendant type release treatment was applied to one surface of a base material 2 made of a semitransparent OPP film having matte processing on both surfaces. Next, the first colored layer 3 consisting of 25 parts by weight of pigment and 75 parts by weight of thermoplastic elastomer was applied to a predetermined portion of the surface of the base material 2 opposite to the release-treated surface in a thickness of 1 μm. Next, a second colored layer 4 composed of urethane/vinyl chloride ink and a curing agent was applied to the substrate 2 so as to cover the first colored layer 3 in a thickness of 5 μm. Next, a pressure-sensitive adhesive obtained by crosslinking an acrylic resin with a crosslinking agent was applied to a thickness of 30 μm to obtain a tamper-proof pressure-sensitive adhesive tape. A sheet made of this tamper-proof adhesive tape was slit with a width of 18 mm and wound around a paper tube to produce a tubular adhesive tape roll.

<Comparative Example 1>
An adhesive tape roll was produced in the same procedure as in the example except that the base material that was not matted was used.

<Comparative example 2>
A commercially available tape roll using silicone as an adhesive tape was prepared.

<Peel force test>
According to JIS-Z-0237 10.3, the adhesive tape was fixed to the SUS plate with the adhesive layer side facing downward. Peel off only the part corresponding to the upper layer from the adhesive tape, and set it on the tensile tester (AGS-X made by Shimadzu Corporation) so that the angle between the part corresponding to the peeled upper layer and the part corresponding to the lower layer is 90°. Then, the force required for peeling at a predetermined speed (300 mm/min) was measured.

As a result of the above test, the peeling force required for peeling between the upper layer and the lower layer was Example: 0.23 N/10 mm. In Comparative Example 2, peeling occurred between the upper layer and the lower layer during rewinding from the pressure-sensitive adhesive tape roll, and therefore the measurement by the above test could not be performed.

<Low speed unwinding force test>
According to JIS-Z-0237 11 (low-speed unwinding force), the tape was set on a tensile tester (AGS-X manufactured by Shimadzu Corporation), and measurement was performed at a predetermined speed (300 mm/min).

As a result of the above test, the low speed rewinding force was 0.87 N/10 mm in Example: Comparative Example 2: 0.048 N/10 mm in Comparative Example.

<Breaking force test>
According to JIS-Z-0237 10.3, the adhesive tape was fixed to the SUS plate with the adhesive layer side facing upward and the substrate side facing downward. On the adhesive layer side of the adhesive tape, the standard tape (acetate cloth adhesive tape manufactured by Teraoka Seisakusho Co., Ltd.: cloth base tape) was left and held with a 2 kg roller for one reciprocating pressure, and the standard tape grip and the adhesive were applied. The tensile tester (AGS-X manufactured by Shimadzu Corporation) was set so that the angle with the tape was 90°, and the force required for peeling at a predetermined speed (300 mm/min) was measured.

As a result of the above test, the breaking force required for breaking the lower layer and peeling the lower layer from the upper layer was 9.31 N/10 mm in the examples.

<Falsification prevention function development test>
Regarding the adhesive tape rolls of Examples and Comparative Examples 1 and 2, three rolls each were checked immediately after the adhesive tape was unwound from the adhesive tape roll and before and after the peeling force test, and the state of the adhesive tape was confirmed based on the following criteria. An evaluation was made.
+++: Characters derived from delamination were clearly recognized on all the adhesive tapes.
++: Characters derived from delamination were confirmed in all the adhesive tapes.
+: Characters slightly due to delamination were confirmed with an adhesive tape of 1 or more.
-: No characters derived from delamination were confirmed.

Table 1 below shows the measurement results regarding the expression of the tampering prevention function immediately after unwinding the adhesive tape from the adhesive tape roll and before and after the peeling force test.

As can be seen from the above test and the results in Table 1, in the example, since the base material is subjected to the mat processing, the peeling force required for peeling between the upper layer and the lower layer is larger than that in Comparative example 1. large. Therefore, according to the embodiment, in the adhesive tape before rewinding the adhesive tape from the adhesive tape roll, such as when storing the adhesive tape roll, and the adhesive tape of the unwound portion at the time of rewinding the adhesive tape, No characters derived from peeling were confirmed. Further, in the breaking strength test, it was confirmed that the upper layer and the lower layer could be peeled. In addition, it was confirmed that the low-speed rewinding force was not so strong that the user could rewind the adhesive tape without feeling any burden during rewinding.

From the peeling force test and the results of Table 1, in Comparative Example 1, since the base material is not subjected to the mat processing, the peeling force required for peeling between the upper layer and the lower layer is smaller than the peeling force in Examples. .. Therefore, in the adhesive tape in the unwound portion at the time of rewinding the adhesive tape, the characters derived from the delamination were clearly confirmed in all the adhesive tapes.

From the results of Table 1, in Comparative Example 2, the characters derived from the delamination could be confirmed on a part of the adhesive tape before the adhesive tape was rewound from the adhesive tape roll. As a result, in the pressure-sensitive adhesive tape according to Comparative Example 2, the peeling force between the layer accompanying the base material and the layer remaining on the adherend may be weak, and the adhesive tape in the pre-stage of the intended tampering prevention function manifestation may occur. Also, it was confirmed that peeling may occur between the layer that accompanies the base material and the layer that remains on the adherend, and the tampering prevention function may be exhibited.

The pressure-sensitive adhesive tape roll around which the tamper-proof adhesive tape of the present invention is wound can be suitably used as a tamper-proof pressure-sensitive adhesive tape capable of confirming that the tape has been peeled off from the adherend.

1 Tamper-proof adhesive tape 2 Base material 3 First colored layer 4 Second colored layer 5 Adhesive layer 6 Upper layer 7 Lower layer 8 Third colored layer

Claims (11)

A semi-transparent base material, a first colored layer laminated on a part of the one side surface of the base material, the first colored layer containing a first coloring material and a thermoplastic elastomer, and the first side surface on the one side surface of the base material. Laminated to cover the colored layer, a second colored layer containing a second colored material, and a second colored layer laminated, comprising an adhesive layer containing a resin, the adhesive layer side is adhered to the adherend. Adhesive tape formed by winding a tamper-proof adhesive tape that can be peeled off at the interface between the upper layer having the base material and the first colored layer and the lower layer having the second colored layer and the adhesive layer in the closed state. A roll,
At least the one surface of the base material is subjected to mat processing,
The peeling force, which is the force required to continue peeling by pulling the end portion of the upper layer peeled from the lower layer, is a low-speed rewinding force when the tampering prevention tape is rewound at a pulling speed of 300 mm/min. Smaller, and the breaking force, which is the force required to break the upper layer that has not been peeled from the lower layer to create a trigger for peeling from the lower layer, is greater than the low-speed rewinding force. Yes, an adhesive tape roll. The pressure-sensitive adhesive tape roll according to claim 1, wherein the surface roughness Ra of the surface of the base material on which the mat processing has been performed is 0.2 μm or more and 1.2 μm or less. The pressure-sensitive adhesive tape roll according to claim 1 or 2, wherein the tamper-proof pressure-sensitive adhesive tape does not contain a silicone resin. The first colored layer contains the first colored material in a ratio of 10 parts by weight or more and 50 parts by weight or less, and the thermoplastic elastomer, when the entire first colored layer is 100 parts by weight. The pressure-sensitive adhesive tape roll according to any one of claims 1 to 3, which is contained in a ratio of 50 parts by weight or more and 90 parts by weight or less. The second coloring material of the second coloring layer contains a urethane/vinyl chloride ink, and has the same color as the first coloring material of the first coloring layer,
The second colored layer contains the second colored material in a proportion of 80 parts by weight or more and 99 parts by weight or less and a curing agent of 1 part by weight or more when the entire second colored layer is 100 parts by weight. The adhesive tape roll according to any one of claims 1 to 4, wherein the adhesive tape roll is contained in a proportion of 20 parts by weight or less. The pressure-sensitive adhesive tape roll according to claim 1, wherein a peeling force between the upper layer and the lower layer is 0.01 N/10 mm or more and 0.4 N/10 mm or less. The said adhesive layer WHEREIN: The non-adhesive part is provided in the both ends of the direction orthogonal to the rewinding direction of the said tampering prevention adhesive tape, The non-adhesive part is provided, The any one of Claims 1-6 characterized by the above-mentioned. Adhesive tape roll. The pressure-sensitive adhesive tape roll according to any one of claims 1 to 7, which has no adhesive force between the upper layer and the lower layer after the upper layer is peeled from the lower layer. The pressure-sensitive adhesive tape roll according to any one of claims 1 to 8, wherein the second colored layer further has a third colored layer in a portion facing the first colored layer. The pressure-sensitive adhesive tape roll according to any one of claims 1 to 8, wherein the second colored layer contains a fluorescent material that emits fluorescence by ultraviolet rays having a wavelength of 360 nm or more and 390 nm or less. The pressure-sensitive adhesive tape roll according to claim 9, wherein the third colored layer contains a fluorescent material that emits fluorescence by ultraviolet rays having a wavelength of 360 nm or more and 390 nm or less.