JPS61297197A - Writing sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a writing sheet used for electronic blackboards, whiteboards, etc., which has a surface that allows repeated writing and erasing with a predetermined marker.

<Prior art> In recent years, in the field of teaching materials and stationery, there has been a remarkable spread of white boards or sheets that do not use chalk, do not stain hands with powder, and can be written on and erased repeatedly. Electronic blackboards allow you to instantly reduce and copy information written on a white writing sheet to an easy-to-handle A4 size, etc., so there is no need to take notes each time you are at a meeting (meetings, seminars, etc.). It is attracting attention in various fields because it can dramatically improve the efficiency of

Writing is written on the writing sheets used as surface materials for electronic blackboards, whiteboards, etc. (Since information often includes not only letters but also figures such as tables, graphs, illustrations, etc., the writing sheets are prepared in advance. It is convenient to print images in any format suitable for the purpose, such as monthly schedules, work instructions, Japanese blank maps, golf score sheets, staff notations, grids, etc., on the surface in advance. Quite strong.

However, the surface of the writing sheet has physical properties that allow it to be repeatedly written with a designated marker and erased with an eraser. There is also a problem that the data is also erased. Further, in the case of an electronic blackboard, a writing sheet for about five screens is usually wound up and rewinded to be electrically driven. Therefore, it is necessary to print a different format for each screen of the long writing sheet for five screens in accordance with the customer's requirements, making it difficult to select an appropriate printing method and being quite limited.

For example, when printing on the surface of a writable and erasable film constituting a writing sheet using a screen printing method, which is considered to be relatively suitable for such printing, as mentioned above, due to the releasability of the film surface of fluorine-based materials, etc. Due to the poor adhesion of printing ink, the format may disappear when trying to erase normal written information many times with an eraser, or during the process of winding up a long writing sheet many times. In addition to the problems, 1) Cracks occur in the printing ink layer during the rolling operation of long writing sheets, 2) During normal writing operations, it is difficult to erase with an eraser because it is mistaken for a special marker. When erasing information recorded with a marker using an organic solvent, there were problems such as erasing the format itself or causing smearing on the lines.

In addition, this type of writing sheet that has been proposed in the past is made by pasting a writing/erasable film onto a support such as a plastic film or paper using an adhesive.
The manufacturing process tends to be complicated and expensive.

<Problems to be Solved by the Invention> The present invention has been made in view of the above circumstances, and it is possible to print a wide variety of products in small quantities with a relatively simple operation process, and has excellent practicality such as erasure resistance. Format printing with
This makes it possible to apply it to writing sheets used as surface materials for electronic blackboards, whiteboards, and the like. Further, in the present invention, the writing sheet, which has conventionally been composed of a multi-layered sheet in which the manufacturing process is repeated, is supplied as a plastic film composed of a single-layered sheet.

Note that arbitrary printing as used in the present invention refers to so-called format printing that is performed on the surface of a writing sheet in advance according to the customer's purpose and preference, and includes line drawings or arbitrary printing of figures, tables, characters, numbers, etc. This refers to all printing that is expressed as a solid image, halftone image, etc. with an area of . In addition, in this case, the solid image or halftone image of any area includes a wide range of printed images including one entire screen of a writing sheet.

<Means for Solving the Problems> The writable and erasable plastic film constituting the writing sheet in the present invention may be any film having a surface on which information written with a marker can be easily erased with an eraser. It is often colored in an opaque white color so that information written with colored markers can be clearly read, or it may be a transparent film.

As a specific material, for example, the thickness is 50 to 250III1.
It may be a fluorine-based plastic film or a support film such as a polyester film as described in No. 1, provided with a coating layer of a fluorine-based or silicone-based resin to impart writing erasing properties to the surface. And these plastic films have
For example, a white opaque layer is coated on the back side, a white extender pigment is kneaded into the film itself to make it opalescent, or the film surface is subjected to a vapor deposition process so that the written information written by the marker can be clearly read. Alternatively, it is preferable that the film be colored and opaque by brushing the film surface or forming voids within the film.

Further, the sublimable dye ink used in printing of the present invention is composed of the following sublimable dye and vehicle components. That is, disperse dyes are mainly used as sublimable dyes, such as C and I as blue dyes.

Anthraquinone dye such as Disperse Blue 3, C, 1, Disperse Vio as a purple dye
Azo dyes such as let 12, C, 1, Dispers
anthraquinone dyes such as e Violet 4, C, I as red dyes, azo dyes such as isperse Red 17, anthraquinone dyes such as C, 1, Disperse Red 4, and C, I as orange dyes.

Azo dyes such as Disperse Orange 3 are applied.

In addition, examples of resins constituting the vehicle component include ethyl cellulose, hydroxyethyl cellulose, cellulose acetate []] pione 1, alkyd resin, and polyhinyl alcohol, while examples of the solvent constituting the vehicle component include ethyl alcohol, Isopropyl alcohol,
Toluene, ethyl acetate, ethylene glycol monoethyl ether, etc. are applicable. The writing sheet of the present invention can be produced using these materials by the following method.

First, using ordinary printing means such as lithographic printing and gravure, a predetermined printing is performed on a base material such as paper with four-color dye ink to produce an original sheet. Furthermore, at this time, by selecting an arbitrary color for the sublimable dye, it is possible to print in various colors, or it is possible to perform full-color printing by applying ordinary photolithography.

On the other hand, as a method for producing this original sheet, a toner image containing a sublimable dye mixed in a binder resin may be formed on the base material by applying an electrophotographic method.

After that, the printed side or tree-image side of the original sheet is superimposed on a writable and erasable plastic film, and the sublimable dye in the sublimable dye ink is sublimated and transferred to the film side by heating and pressure bonding, and then the original sheet is separated and shifted. Bye. Note that the sublimation dye may be transferred from either the front or back side of the plastic film. The conditions for heat-pressure transfer in this case vary depending on the composition of the sublimable dye and the material of the film, but generally require a temperature of 180°C to 200°C. The writing sheet of the present invention can be obtained by heat-pressing.

In this way, the image made of the sublimable dye printed on the writable and erasable plastic film surface of the writing sheet does not only simply color the surface -F of the film due to the strong penetrating power of the dye molecules, but also reach the inside of the This enables stable printing with excellent abrasion resistance on the surface of the writable and erasable plastic film.

The writing sheet of the present invention obtained as described above can be applied to an electronic blackboard by processing it into a long sheet with several sides or an endless sheet, or can be applied to a whiteboard by pasting it on a board surface such as plywood or metal plate. It can be used as a whiteboard (whiteboard), or it can be used as a simple writing sheet by adding magnetism to the back or cutting it to an appropriate size without any processing and pasting it on a bulletin board or wall. You can also use

Further, when using a transparent film as a writing sheet, it may be used by pasting or placing it on a substrate such as white plywood or metal plate.

<Example> The present invention will be explained in detail with reference to Examples below.

Example 1 A white paint having the following formulation was coated on one side of a writable and erasable plastic film made of a tetrafluoroethylene/ethylene copolymer film (Aflex, manufactured by Asahi Glass Co., Ltd.) with a thickness of 100 mm. On the other hand, anthraquinone disperse dye (TS Turquoise Blue 618, manufactured by Sumima Kagaku Co., Ltd.) 6
Using a sublimable dye ink consisting of 94 parts by weight and a vehicle component consisting of ethyl cellulose, ethyl alcohol, and ethyl acetate, a blue grid pattern was printed on high-quality paper using an offset printing machine to prepare an original sheet.

The printed surface of the obtained original sheet and the writable and erasable film surface (non-coated surface) of the plastic film are overlapped -t! A sublimable dye image was transferred onto the surface of the film using a heating transfer device at 200'C to produce a writing sheet of the present invention.

When this writing sheet was applied to an electronic blackboard and a special marker was used to write various letters, numbers, and other information using normal operations and reduced copies were made, clear copies were obtained, including the grid format. The effectiveness of square grid format printing was confirmed. Furthermore, even if the written information such as letters and numbers was erased many times with an eraser, the format was not erased at all and was extremely stable.

Example 2 The white paint used in Example 1 was coated on one side of a writable and erasable film made of a tetrafluoroethylene/ethylene copolymer film (Aflex, manufactured by Asahi Glass Co., Ltd.) having a thickness of 200 um.

On the other hand, a black map of Japan was printed on high-quality paper using an offset printing machine using a sublimable dye ink consisting of 15 parts by weight of a sublimable dye consisting of the combination composition of the following four colors and 85 parts by weight of a vehicle component consisting of ethyl cellulose and ethyl alcohol. An original sheet was created by printing.

The format printed surface of the obtained original sheet and the writable and erasable film surface (non-coated surface) of the above-mentioned plastic film are superimposed, and the format image of the sublimable dye is transferred onto the surface of the film using a heating transfer device at 200° C. to produce the present invention. A writing sheet was prepared.

When the practical characteristics of this writing sheet were evaluated in the same manner as in Example 1, it was confirmed that the writing sheet had excellent characteristics in format printing using sublimable dyes.

<Effects of the Invention> Since the present invention has the above-mentioned configuration, it is possible to print any desired image at low cost with a simple operation on the surface of an erasable plastic film of a writing sheet used for electronic blackboards, whiteboards, etc. Since the sublimable dye image penetrates into the interior of the film, it is not erased even when rubbed with an eraser, making it possible to print in extremely stable formats. Especially when applied to electronic blackboards, by preparing multiple original sheets with formats printed on them, it is possible to print a wide variety of products in small quantities on each color of a long writing sheet. It has become possible to apply it to various purposes.

In addition, by arbitrarily selecting various types of sublimation dye inks for the original image on the original sheet, multicolor or full-color printing is possible on the writing sheet, and a recording mechanism with color separation function is built into the electronic blackboard. Then, you can instantly reduce the large color image on the writing sheet surface and obtain a color copy.

Claims (1)

[Scope of Claims] 1. A writing sheet comprising a writable and erasable plastic film which is optionally printed with a sublimable dye. 2. The writing sheet according to claim 1, wherein the plastic film is colored and processed to be opaque.