JP2000212521A - Transparent writing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a transparent writing sheet applicable to an article, etc., and writable with a water-soluble ink. SOLUTION: This transparent writing sheet 10 is composed by forming a writable layer 12 on one surface of a transparent resin substrate 11, e.g. a PET film and providing a bonding layer 13 comprising, e.g. an acrylic adhesive on the other surface. The writable layer 12 is composed by using a coating material having water solubility or hydrophilicity or water absorptivity and containing, e.g. starch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a writable sheet that can be attached to an article or the like.

[0002]

2. Description of the Related Art Conventionally, for example, for indicating the owner of an article, a sheet, such as a seal, which can be attached to the article and which can be written, has been frequently used. As such a writing sheet, there is a sheet formed by providing an adhesive layer on an opaque base material such as paper so as to be able to adhere to an article. In addition, there is a method in which release paper is provided on the surface of the adhesive layer and peeled off from the adhesive layer when used.

[0003]

However, in recent years, in optical recording media, personal computers, stationery and the like, a transparent casing is preferred, and a writing sheet having a conventional opaque base material is used in such a casing. Pasting is
It was not preferred because it would impair the appearance. Therefore, development of a writable sheet having a transparent base material itself has been desired.

As a transparent sheet that can be attached to an article or the like, there is a transparent adhesive tape such as a cellophane tape.
Such a sheet has poor writing properties, and it is difficult to write on the surface. For example, a tape with a matte finish on the surface, such as Scotch Mending Tape (manufactured by Sumitomo 3M) has better writing properties than cellophane tape, etc., but attempts to write on the surface with widely used water-based ink. In this case, the water of the ink is repelled without being absorbed, and writing is also difficult. The present invention has been made based on the above background, the purpose of which is to
An object of the present invention is to provide a transparent writing sheet that can be attached to an article or the like and can be written with an aqueous ink.

[0005]

The object of the present invention is to provide a transparent writing sheet having a writable layer provided on one surface of a transparent resin substrate and an adhesive layer provided on the other surface. This is achieved by a transparent writing sheet, wherein the writable layer has water solubility, hydrophilicity, or water absorption.

[0006] Here, "the writable layer has water solubility" means that the portion of the writable layer to which the aqueous ink adheres is dissolved by the water in the aqueous ink, and when the water evaporates, the pigment in the ink is converted to the pigment. It means that the writable layer has properties retained in the writable layer. Further, "the writable layer has hydrophilicity" means that the portion of the writable layer to which the aqueous ink is attached has a property in which the pigment is retained by affinity with water in the aqueous ink, and the writable layer has That means. Further, "the writable layer has water absorbency" means that the writable layer has a property of easily allowing the penetration of water in the aqueous ink.
The writable layer is required to be transparent, and its thickness is preferably in the range of 2 to 20 μm.

[0007] Such a writable layer is composed of a gelatin for photographic film, a paint (for example, a silk paint manufactured by Cashew Co., Ltd.) composed of natural silk as a raw material, a paint containing cotton powder, and a paint containing starch. And the like.

[0008] PET film, transparent resin substrate,
A TAC film, a PE film, a PP film or the like can be used. The surface of the transparent resin substrate on the side where the writable layer is provided is preferably formed on a non-smooth surface such as, for example, a matte surface. The thickness of the transparent resin substrate is 25 to 150
It is preferably in the range of μm.

[0009] The adhesive layer is also required to be transparent, and its thickness is preferably in the range of 5 to 40 µm. Such adhesive layers include acrylic adhesives, corn starch,
Although it can be formed using a rubber-based adhesive or the like, it is particularly preferable to use an acrylic adhesive. Note that release paper may be provided on the surface of the adhesive layer.

[0010] The transparent writing sheet having the above-described structure can be written on the surface thereof with an aqueous ink, and is suitable for being attached to a transparent housing.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention. A transparent writing sheet 10 shown in FIG. 1 has a transparent resin substrate 11 made of a PET film.
(50 μm in thickness), one surface is formed on a matte surface, a writable layer 12 is provided on the surface, and an adhesive layer 13 made of an acrylic adhesive is provided on the other surface.

Here, the thickness of the writable layer 12 is set to 5 μm. The thickness of the adhesive layer is set to 18 μm.

The transparent writing sheet 10 having such a configuration is
Writing can be performed on the writable layer 11 with an aqueous ink. In addition, since the surface of the transparent resin base under the writable layer 12 is formed on the matte surface, there is appropriate friction. For example, when a water-based ink ball-point pen is used, the ball of the ball-point pen smoothly rolls. Then, the ink is satisfactorily supplied.

In order to smoothly roll the ball of the ballpoint pen, it is effective to increase the size of the water-soluble or hydrophilic powder particles in the writable layer. Furthermore, mixing fibers such as polyester in the writable layer as a filler is not only effective for smooth rolling of the ball, but also effective for preventing the water-soluble material from flowing out when a large amount of ink is applied. is there.

Further, since the adhesive layer 12 is made of an acrylic adhesive, it has excellent transparency and does not ooze out even after long-term use.

FIG. 2 shows a second embodiment of the present invention. In the following description, the members and the like already described are denoted by the same reference numerals or corresponding reference numerals in the drawings to simplify or omit the description. The transparent writing sheet 20
One surface of a transparent resin substrate 11 made of a PET film is formed on a matte surface, and a writable layer 12 is formed on the surface.
And an adhesive layer 13 made of an acrylic adhesive is provided on the other surface.

On the surface of the adhesive layer 13, release paper 24
Is affixed. Such a transparent writing sheet 20 is
Before the release paper 24 is peeled off from the adhesive layer 12, it is possible to write on the writable layer, which is convenient.

FIG. 3 shows a third embodiment of the present invention. Here, the same transparent writing sheet 1 as in the first embodiment is used.
0 is wound around the core 34. Such a transparent writing sheet 30 has good storability and is not bulky. Further, it can be used after being cut to an arbitrary length.

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and changes can be made.
Also, in order to indicate in which label area the recording medium or the like to which the transparent writing sheet is to be pasted is to be attached to the writable layer of the transparent writing sheet, such as "back label" or "front label". The display can also be entered by printing.

[0020]

As described above, it is possible to write on the surface of the transparent writing sheet and the aqueous ink of the present invention, and it is also suitable to be attached to a transparent casing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the present invention.

FIG. 3 is a perspective view showing a third embodiment of the present invention.

[Explanation of symbols]

 10, 20, 30 Transparent writing sheet 11 Transparent resin base material 12 Writable layer 13 Adhesive layer 24 Release paper 34 Core material

Claims (1)

[Claims] 1. A transparent writing sheet provided with a writable layer on one surface of a transparent resin substrate and an adhesive layer on the other surface, wherein the writable layer is water-soluble or hydrophilic or water-absorbing. A transparent writing sheet having characteristics.