JP7232972B2 - Double-sided adhesive tape or double-sided adhesive sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a double-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive sheet capable of concealing information by being attached to an adherend on which information is displayed.

Personal information that should not be leaked or spread without reason is written or printed on postcards, envelopes, slips, statements of delivery, invoices, payment details, prescriptions for medicines, and other documents. Therefore, when disposing of these, it is required to appropriately conceal the written or printed personal information.

As a tool used to conceal information displayed on postcards, envelopes, documents, etc., a stamp that imprints random characters, figures, etc. on top of the information (for example, Non-Patent Document 1 below ) are known. However, in this type of stamp, the information that should be hidden is not sufficiently hidden due to uneven coating of the coloring agent (pigment or dye), the coloring agent fades over time, and when it comes into contact with other objects There is a problem that the coloring agent rubs and becomes thin. In addition, the coloring agent may stain the user's fingers and the like.

It is also conceivable to apply an opaque adhesive tape or sheet over the information (see, for example, Patent Documents 1 and 2 below). In this case, the problems associated with stamps as described above are less likely to occur, but it is necessary to apply adhesive tape or seals so as to cover the entire area where the information is displayed, which incurs a corresponding material cost and is not necessarily economical. not targeted.

Japanese Patent No. 5500570 JP 2016-200644 A

“Personal information protection stamp “Keshipon (registered trademark)” series”, [online], Plus Co., Ltd., [searched on July 25, 2017], Internet <URL: https://bungu.plus.co.jp/ product/security/keshipon/index.html>

An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive sheet that can suitably conceal information by being attached to an adherend on which information is displayed, and that is economically efficient.

In the present invention, a double-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive sheet that can hide information by being attached to an adherend on which some information is expressed, wherein the pressure-sensitive adhesive layer adheres to the adherend and The pressure-sensitive adhesive layer is provided, and both sides of the pressure-sensitive adhesive layer are adhered to each of the adherends that overlap each other through the pressure-sensitive adhesive layer, and when an external force acts to peel off the adherends, interlaminar breakage or delamination occurs. A double-faced pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive sheet comprising a base material which is divided into two parts by each part and which maintains an opaque state in which the information cannot be seen through while each part is adhered to the adherend. Here, "interlayer failure" means that the base material of the double-sided adhesive tape or double-sided adhesive sheet is broken and separated into two (interlayer cracks), and "interlayer delamination" means that multiple or many layers are separated. It refers to the separation of a layer and the layer to which it joins the overlapping substrates, thereby separating the substrates into two. Such a double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet does not cause the problem of rubbing of a colorant like a stamp and does not stain the user's fingers.

The base material is mainly made of paper made of pulp fibers, for example.

Regarding the base material, the color is an opaque dark color (for example, black, navy blue, dark red, etc., not necessarily a single color), or the base material has a pattern, figure, character or picture. It is preferably printed .

Further, the adhesive layer has a long belt shape extending in a predetermined direction, and is provided with an easily peelable support adhered to one surface of the base material via the adhesive layer, and the base material and the adhesive layer are provided. If a cut perpendicular to the stretching direction is formed in the base material and the adhesive layer so as to divide the can be easily excised in the form of a fragment or a continuous plurality of fragments.

According to the present invention, it is possible to realize a double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet that can suitably conceal information by being attached to an adherend on which information is displayed, and that is economically efficient.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows typically the double-sided adhesive tape of one Embodiment of this invention. The perspective view explaining the usage of the double-sided adhesive tape of the same embodiment. Sectional drawing explaining the usage of the double-sided adhesive tape of the same embodiment. The perspective view explaining the usage of the double-sided adhesive tape of the same embodiment. Sectional drawing explaining the usage of the double-sided adhesive tape of the same embodiment. The perspective view explaining the usage of the double-sided adhesive tape of the same embodiment. Sectional drawing explaining the usage of the double-sided adhesive tape of the same embodiment. Sectional drawing explaining the usage of the double-sided adhesive tape of the same embodiment. Table showing the results of experiments to measure the internal bond strength or delamination strength of various paper materials. Graph showing the results of experiments to measure the internal bond strength or delamination strength of various paper materials. FIG. 2 is a cross-sectional view for explaining a method of an experiment for measuring internal bond strength or delamination strength of paper materials.

One embodiment of the present invention will be described with reference to the drawings. The double-sided pressure-sensitive adhesive tape 1 of this embodiment shown in FIG. used to hide the The target adherend 3 is, for example, a postcard, a sealed envelope, a slip, a statement of delivery, an invoice, or a statement of payment on which personal information that should be appropriately concealed, such as name, address, and telephone number, is written or printed. , medical prescriptions and other documents.

The base material 11 of the double-sided adhesive tape 1 is mainly made of paper produced by agglutinating plant or other pulp fibers. Inside the base material 11, the pulp fibers are randomly arranged substantially parallel to the surface of the base material 11 and overlap each other to form a paper layer. The base material 11 may have a single-layer structure, or may have a multi-layer structure or a multi-layer structure in which a plurality of thin layers are laminated. The color of the substrate 11 is preferably an opaque dark color, such as black, navy blue, or dark red. However, the base material 11 is not limited to be monochromatic, and may be printed with patterns, figures, characters, pictures, and the like.

The pressure-sensitive adhesive layer 12 of the double-sided pressure-sensitive adhesive tape 1 is formed by applying a pressure-sensitive adhesive to both the front and back surfaces of the substrate 11 . Adhesives of various known types and aspects are allowed to be used. As will be described later, the adhesive strength exerted by the adhesive layer 12 when the double-sided adhesive tape 1 is attached to the adherend 3 should exceed the internal bond strength or the delamination strength of the substrate 11. , the components and composition of the adhesive, and the amount and thickness of the adhesive to be applied to the substrate 11 are required to be set. The internal bonding strength or delamination strength means that when an external force is applied to separate the surface (or back surface) of the base material 11 from the back surface (surface), the base material 11 undergoes delamination or delamination. It refers to the strength of the base material 11 that can withstand the force in the thickness direction of the substrate 11 .

The double-sided pressure-sensitive adhesive tape 1 of this embodiment has a long strip shape extending in a predetermined direction. Thus, the support 13 is adhered to the base material 11 of the tape 1 via the adhesive layer 12 . The support 13 plays a role of supporting and transporting the substrate 11 coated with the adhesive layer 12 and a role of a release liner that protects the adhesive layer 12 and maintains its adhesiveness. . The support 13 is made using a material that can be easily peeled off from the pressure-sensitive adhesive layer 12 .

The present double-sided adhesive tape 1 can be suitably used together with a transfer tool 2 which is a kind of tape dispenser. The transfer tool 2 is conventionally known, and its specific structure and function are disclosed in Japanese Patent No. 6015266, for example. That is, as shown in FIG. 8, the transfer tool 2 feeds out the double-faced adhesive tape 1 from a feeding reel on which the double-sided adhesive tape 1 is wound in advance, winds the tape 1 around the take-up reel, and winds the tape 1 thereon. The transfer head 21 presses the tape 1 against the adherend surface of the adherend 3, thereby transferring the substrate 11 and the adhesive layer 12 to the adherend surface. The delivery reel of the transfer tool 2 holds the tape 1 in which the substrate 11 and the adhesive layer 12 are supported by the support 13 in a wound state. On the other hand, the take-up reel takes up only the tape 1 after passing the transfer head 21 , that is, the support 13 after the substrate 11 and the adhesive layer 12 have been transferred to the adherend 3 . Needless to say, the support 13 is not transferred to the adherend 3 and does not adhere to the adherend 3 .

In the double-sided adhesive tape 1, the base material 11 and the adhesive layer 12 excluding the support 13 are provided with cuts 14 that divide them into a plurality of pieces arranged along the stretching direction of the tape 1. . Therefore, when the base material 11 and the adhesive layer 12 are transferred from the support 13 of the tape 1 to the adherend surface of the adherend 3, the base material 11 and the adhesive layer 12 are transferred to the required size or amount in one piece. It can be easily cut out in the form of a fragment or a series of multiple fragments.

To describe an example of how to use the double-sided adhesive tape 1 of this embodiment, first, as shown in FIGS. , the substrate 11 and the adhesive layer 12 are transferred. As a result, the adhesive layer 12 provided on one surface of the base material 11 adheres to the adherend surface of the adherend 3, and the base material 11 adheres to the adherend surface.

After that, as shown in FIGS. 4 and 5, by folding the adherend 3 in two, the information to be hidden on the adherend 3 is displayed, but the base material 11 of the transfer tape 1 is still visible. The remaining half area that is not adhered is overlaid on the adhesive layer 12 provided on the other side of the base material 11 . As a result, the adhesive layer 12 provided on the other surface of the substrate 11 adheres to the adherend surface of the adherend 3, and the substrate 11 adheres to the adherend surface. In addition, the folded adherends 3 overlap each other with the substrate 11 of the double-sided tape 1 and the pressure-sensitive adhesive layer 12 interposed therebetween.

When the overlapping adherends 3 are peeled off from the double-sided adhesive tape 1 and unfolded in this manner, an external force acts on both the front and back surfaces of the substrate 11 to separate one surface from the other surface. It will be done. The internal bonding strength or delamination strength of the base material 11 determines the adhesive strength of the adhesive layer 12 that adheres the base material 11 to the adherend surface of the adherend 3, and the cohesion of the adhesive layer 12. The adherend 3 is peeled off from the base material 11 (interfacial peeling between the adhesive layer 12 and the adherend 3, adhesive The base material 11 itself causes interlaminar failure or delamination prior to cohesive failure in which the failure occurs inside the layer 12 or anchoring failure in which the failure occurs between the adhesive layer 12 and the substrate 11).

As a result, as shown in FIGS. 6 and 7, the base material 11 is divided into two parts, and each part is adhered to the entire area of the unfolded adherend 3 where the information to be hidden is displayed. It looks like it's covered. At this time, each part of the base material 11 divided into two parts still has a thickness enough to maintain an opaque state in which it is difficult for visible light to pass through and information displayed on the adherend 3 cannot be seen through. ing.

In selecting a suitable paper material for the base material 11, as a method for measuring the internal bonding strength or delamination strength of paper, for example, JAPAN TAPPI (Paper and Pulp Institute) paper pulp test method No. 18-1:2007 (Paper and paperboard-Inner bond strength test method-Part 1: Z-axis tensile test method), No. 18-2:2000 (Paper and paperboard--Internal bond strength test method--Part 2: Internal bond tester method); 19-1: 2000 (Paperboard-Peel strength test method for interlocking layers-Part 1: Maximum load measurement method), No. 19-2: (Paperboard-Peel strength test method for interlocking layers-Part 2: Average load measurement method) is known. However, test method No. Reference numeral 18 applies an external force to the entire surface of the paper in a direction perpendicular to the front and back surfaces of the paper. It may not exactly match the force acting on the material 11 . In terms of the force acting on the substrate 11, test method No. It can be said that 19 is closer to reality. In particular, test method no. No. 19 is primarily intended to evaluate paperboards in which one or both sides of the outer layer are made of a different stock than the middle layer.

For reference, FIGS. 9 and 10 show the results of measuring the internal bond strength or delamination strength of various paper materials. The paper material on which the measurement was performed was
(I) Colored wood-free paper Kishu Rainbow (registered trademark, manufactured by Hokuetsu Kishu Paper Co., Ltd.) Black Extra-thin (II) Colored wood-free paper Kishu Rainbow Black Light (III) Colored wood-free paper Kishu Rainbow Black Heavy (IV) envelope paper (color Bleached kraft paper) Cony Wrap (registered trademark, manufactured by Lintec Corporation) Black Weight per square meter 50 g/m ²
(V) Envelope Paper Cony Wrap Black Weight 70 g/m ²
(VI) Envelope Paper Cony Wrap Black Weight 85g/ ^m2
(VII) Copy paper KB paper (manufactured by Kokuyo Co., Ltd.) basis weight 64 g/m ²
(VIII) White envelope (IX) Bulky light coated paper (matte) HS Humming (registered trademark, manufactured by Hokuetsu Kishu Paper Co., Ltd.) basis weight 70 g/m ²
is.

The measuring method is generally the JAPAN TAPPI Paper Pulp Test Method No. Although it conforms to 19-1, since the details are different, a supplementary explanation will be given below. In the measurements performed here, a test piece of a paper material to be measured for internal bond strength or delamination strength was sized 30 mm along the longitudinal direction and 15 mm along the width direction orthogonal to the longitudinal direction. cut out to Then, as shown in FIG. 11, a plastic film (for example, a PET (polyethylene terephthalate) film having a thickness of 50 μm) 5 is adhered to each of the front and back surfaces of the cut test piece 4 using an adhesive 6 . Each plastic film 5 protrudes ahead of the tip of the test piece 4 along the longitudinal direction of the test piece 4 .

On top of that, the tip of each plastic film 5 that protrudes from the tip of the test piece 5 is held by a clamp 7, and the tips of both plastic films 5 are pulled in a direction away from each other through the clamps 7, Induce delamination or delamination of the test piece 4, peel off the layer on the surface side of the test piece 4 from the layer on the back side, and measure the strongest load during that time (indicator of internal bond strength or delamination strength value) was measured and recorded. During the peeling operation, the unpeeled portion of the test piece 4 is maintained substantially perpendicular to the direction of tension by the clamp 7 . The relative moving speed of one clamp 7 to the other clamp 7 (in the direction away from the other clamp 7) was set to 100 mm/min. Three test pieces 4 were prepared for each paper material to be measured, and measurements were performed three times. The room temperature at the time of measurement was 23° C. and the humidity was 50%.

As shown in FIGS. 9 and 10, the internal bond strength or delamination strength of the colored woodfree papers (I) to (III) is not dependent on its basis weight or thickness, and (IV) to (VI). is stronger than the internal bond strength or delamination strength of (VIII) envelope paper and (VIII) white envelope. Therefore, if (I) to (III) colored high-quality paper is used as the base material 11 of the double-sided adhesive tape 1, (IV) to (VI) envelope paper or (VIII) white envelope paper can be used as the adherend 3 for both sides. When the adhesive tape 1 is adhered and then the adherend 3 is peeled off from the adhesive tape 1, the base material 11 is delaminated or delaminated before the adherend 3 is delaminated or delaminated. cause As a result, as shown in FIGS. 6 and 7, information written or printed on the surface of the adherend 3, such as an envelope, can be suitably concealed. In short, it is desirable to select the base material 11 whose internal bond strength or delamination strength is weaker than the adherend 3 expected for the double-sided pressure-sensitive adhesive tape 1 application.

Many ready-made pressure-sensitive adhesives have sufficiently strong pressure-sensitive adhesive properties. Therefore, as the material for the adhesive layer 12, it is easy to select from among existing adhesives the adhesive strength and the cohesive strength that exceed the internal bond strength or the delamination strength of the base material 11.

According to the present embodiment, it is possible to realize the double-sided pressure-sensitive adhesive tape 1 capable of appropriately concealing the information by attaching it to the adherend 3 on which the information is displayed. The base material 11 and the adhesive layer 12 of the adhesive tape 1 do not necessarily need to be applied so as to cover the entire area of the adherend 3 where the information to be hidden is displayed, and the adhesive tape 1 covers more than half the area of the area. You can paste it. Therefore, the material cost is reduced and it is economical.

The present invention is not limited to the embodiments detailed above. For example, in the above-described embodiment, a strip-shaped double-sided pressure-sensitive adhesive tape 1 extending in a predetermined direction was assumed, but it goes without saying that the double-sided pressure-sensitive adhesive tape 1 may be formed into a sheet extending vertically and horizontally to form a double-sided pressure-sensitive adhesive tape. .

In addition, the specific configuration of each part can be modified in various ways without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1... Double-sided adhesive tape 11... Base material 12... Adhesive layer 13... Support body 14... Cut line 3... Adherend

Claims (3)

A double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet that can conceal information by being attached to an adherend on which some information is expressed,
a pressure-sensitive adhesive layer that adheres to an adherend;
The pressure-sensitive adhesive layer is provided on both sides, and both sides adhere to each of the adherends that overlap each other via the pressure-sensitive adhesive layer, and when an external force acts to peel off the adherends, interlaminar breakage or delamination occurs. a base material that is divided into two parts by raising the base material, and each part maintains an opaque state in which the information cannot be seen through while being adhered to the adherend,
The color of the substrate is an opaque dark color or the substrate is printed with a pattern, figure, character or pattern, and the substrate is adhered to the adherend via the adhesive. A double-sided adhesive tape or double-sided adhesive sheet that hides the information displayed on the body so that it cannot be seen through . A double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet that can conceal information by being attached to an adherend on which some information is expressed,
a pressure-sensitive adhesive layer that adheres to an adherend;
The pressure-sensitive adhesive layer is provided on both sides, and both sides adhere to each of the adherends that overlap each other via the pressure-sensitive adhesive layer, and when an external force acts to peel off the adherends, interlaminar breakage or delamination occurs. a substrate that is divided into two parts by raising the substrate, and each part is adhered to the adherend and maintains an opaque state in which the information cannot be seen through,
A double-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive sheet in which the base material is mainly paper composed of pulp fibers. A double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet that can conceal information by being attached to an adherend on which some information is expressed,
a pressure-sensitive adhesive layer that adheres to an adherend;
The pressure-sensitive adhesive layer is provided on both sides, and both sides are adhered to each of the adherends that overlap each other via the pressure-sensitive adhesive layer, and when an external force acts to peel off the adherends, interlaminar breakage or delamination occurs. a substrate that is divided into two parts by raising the substrate, and each part is adhered to the adherend and maintains an opaque state in which the information cannot be seen through,
It has a long belt shape extending in a predetermined direction,
An easily peelable support adhered to one surface of the base material via the pressure-sensitive adhesive layer,
A double-sided pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive sheet in which cuts perpendicular to the stretching direction are formed in the base material and the pressure-sensitive adhesive layer so as to divide the base material and the pressure-sensitive adhesive layer into a plurality of arranged pieces.

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