JPS6287399A - Writing sheet and manufacture thereof - 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. (With electronic blackboards, information written on a white writing sheet can be reduced and copied on the spot to easy-to-handle A4 size, etc., so there is no need to take notes at each meeting, etc.) It is attracting attention in various fields because it dramatically increases the efficiency of seminars.

Writing on writing sheets used as surface materials for electronic blackboards, whiteboards, etc. 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 of the is also 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, since it is necessary to print a different format for each screen of a long writing sheet for five screens in accordance with the customer's requirements, it is difficult to select an appropriate printing method and is quite limited.

For example, when printing on the surface of a writable and erasable resin layer constituting a writing sheet using a screen printing method, which is considered to be relatively suitable for such printing, the adhesion of the screen printing ink is reduced due to the releasability of the resin surface. Worse, in addition to the problem of formatting being erased 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,
1) Cracks occur in the printing ink layer during the rolling operation of a long writing sheet; 2) Information recorded with a marker that is difficult to erase with an eraser because it is mistaken for a special marker during normal writing operations. When erasing images with organic solvents, there were problems such as erasing the format itself or causing smearing on the lines.

<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. This makes it possible to apply any desired printing to a writing sheet used as a surface material for electronic blackboards, whiteboards, and the like.

Note that arbitrary printing as used in the present invention refers to so-called format printing that is performed on a writing sheet in advance according to the customer's purpose and preference, such as drawing figures, tables, numbers, etc. as line drawings or solid sheets of arbitrary area. -3= refers to all printing expressed as images, halftone images, etc. In addition, in this case, the solid image, halftone image, etc. of any area includes a wide range of printed images including one entire screen of a writing sheet.

Means for Solving Problems〉 The support constituting the writing sheet in the present invention is usually a sheet-shaped sheet colored white so that writing on the surface of the writing sheet can be clearly read with a colored marker. For example, 50 to 250 um milky white polyester film, transparent polyester film with a white pigment layer, white coated paper, synthetic paper, etc. are used, but from the viewpoint of hardness and handling, 100 to 150 um thick A milky white polyester film is relatively preferably used.

The writable and erasable resin may be any material that can easily erase information written with a marker on the surface of the coating layer of the resin with an eraser, such as ultraviolet curable unsaturated polyester resin, silane resin, Acrylic resins and the like are applicable to the writable and erasable resin of the present invention.

Further, the sublimable dye ink used for arbitrary printing such as the format of the present invention is composed of the following sublimable dye and vehicle components. That is, disperse dyes are mainly used as sublimable dyes, and for example, C, 1, and D are used as blue dyes.
Anthraquinone dye such as isperse Blue 3, 06N as a purple dye.

Azo dyes such as Disperse Violet 12, c, r.

Anthraquinone dyes such as Disperse Violet 4, C11 and Disperse R as red dyes
Azo dye such as ed 17, C, 1, Disperse
Anthraquinone dyes such as Red 4, azo dyes such as C, I and DisperseOrange 3 as orange dyes, etc. are used.

In addition, examples of the resin constituting the vehicle component include ethyl cellulose, hydroxyethyl cellulose, cellulose acetate propionate, alkyd resin, and polyvinyl alcohol, while examples of the solvent constituting the vehicle component include ethyl alcohol, isopropyl alcohol, toluene, and acetic acid. Ethyl, 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 with sublimation dye ink on a base material such as paper 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 single colors, or it is also possible to perform full-color printing by applying ordinary photolithography. □ Next, the printed surface of the original sheet is superimposed on the support, and the sublimable dye in the sublimable dye ink is sublimated and transferred to the support by heating and pressure bonding, and then the original sheet is separated from the support. Note that the sublimable dye may be transferred to either the front surface or the back surface of the support. The conditions for heat-pressure transfer in this case vary depending on the composition of the sublimable dye, but generally require a temperature of 180°C to 200°C. Printing is performed on the support.

Next, the writing sheet of the present invention can be obtained by applying a writable and erasable resin to the printed surface of the support.

The printed image made of the sublimable dye printed on the support of the writing sheet in this way is not only colored simply on the surface of the support, but also inside the support due to the strong penetrating power of the dye molecules. reach up to. This enables stable arbitrary printing with excellent abrasion resistance even during and after the coating process of the writable and erasable resin.

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 for several screens or an endless sheet, or can be applied to a white board (white board) by pasting it on a board surface such as plywood or metal plate. Alternatively, it can be used as a simple writing sheet by adding magnetism to the back side or cutting it to an appropriate size without any processing and pasting it on a bulletin board or wall. You can also do that.

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

Example 1 A black map of Japan was printed on high-quality paper by an offset printing machine using a sublimable dye ink consisting of 15 parts by weight of a sublimable dye consisting of the combination 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 format printing.

The format printed surface of the obtained original sheet and the surface of a support made of opalescent polyester having a thickness of 125 .mu.m were overlapped, and the format image of the sublimable dye was transferred to the support using a heating transfer device at 200.degree.

Next, on the format printing surface of the support made of the opalescent polyester film, a coating solution consisting of: A writing sheet was prepared.

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

Example 2 A blue square format was printed on J-quality paper using an offset printing machine using a sublimable dye ink consisting of 6 parts by weight of an anthraquine disperse dye and 94 parts by weight of a vehicle component consisting of ethyl cellulose, ethyl alcohol, and ethyl acetate. An original sheet was created by applying the following steps.

The format printed surface of the obtained original sheet and the surface of a support made of opalescent polyester having a thickness of 1251 cm were superimposed, and the format image of the sublimable dye was transferred onto the surface of the support using a heating transfer device at 200°C.

Next, the resin coating liquid used in Example 1 was used for format printing on a support made of opalescent polyester, and the coating was dried and cured by ultraviolet rays to produce a writing sheet of the present invention.

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.

Example 3 15 parts by weight of each of the azo-based red sublimable dye and the black sublimable dye used in Example 1 and 85 parts by weight of the vehicle component used in Example 2 were kneaded to obtain two red and black sublimable dyes.
We have created different kinds of sublimable inks.

Using these two types of sublimation 11: dye inks, two-color red and black format printing was performed on high-quality paper using an offset printing machine to produce an original sheet.

The format printed surface of the obtained original sheet and the surface of a support made of opalescent polyester having a thickness of 125 um were superimposed, and a two-color format image was transferred onto the surface of the support using a heating transfer device at 200°C.

Next, the resin coating liquid used in Example 1 was applied to the Format I printing surface of a support made of a milky white polyester film, and the coating was dried and cured with ultraviolet rays to prepare a writing sheet of the present invention.

When this writing sheet was applied to an electronic blackboard with an electrophotographic recording mechanism and the specified writing information was recorded with a marker and a reduced copy was made, a clear copy including the reproduction of the two-color format image on the original sheet was obtained. Obtained. Moreover, even after repeated erasing operations using an eraser, the two-color format remained stable without being erased at all.

<Effects of the Invention> Since the present invention has the above-described configuration, it is possible to print in any format at low cost with simple operations on the surface of the support of a writing sheet used for electronic blackboards, whiteboards, etc., and moreover, the printed format can be easily printed. Since the sublimable dye image penetrates into the inside of the support, it will not be easily erased even if the support surface is rubbed when applying a writable and erasable resin coating liquid.
Furthermore, even if the surface of the writing sheet is scratched with an eraser, it will not be erased and extremely stable format printing processing can be performed. Especially when applied to electronic blackboards, by preparing multiple original sheets with printed formats separately, it is possible to print a wide variety of products in small quantities on each side of a long writing sheet I. It has become possible to apply it to a wide range of applications.

In addition, by arbitrarily selecting various types of sublimable dye inks for the original image on the original sheet, -12= it becomes possible to print in multiple colors or full colors on the writing sheet, and a recording mechanism with a color separation function is created. If built into an electronic blackboard, a large color image on a writing sheet can be instantly reduced to create a color copy.

Claims (1)

[Scope of Claims] 1. A writing sheet comprising a support coated with a writable and erasable resin, characterized in that the support is optionally printed with a sublimable dye. . 2. Superimposing the printed surfaces of original sheets, which have been arbitrarily printed with sublimable dye ink on the support, on the support and sublimation-transferring the sublimable dye to the support, and then separating the original sheets. 1. A method for producing a writing sheet, which comprises performing arbitrary printing on a support, and then applying a writable and erasable resin to the printed surface of the support.