JPH0416077B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for electronic blackboards, whiteboards, etc., and has a surface that can be repeatedly written and erased with a predetermined marker, and is used for regular base printing. The present invention resides in a method of manufacturing a writing sheet in which display printing of individual patterns is also performed in addition to the above.

[Conventional technology]

In recent years, in the field of teaching materials and stationery, there has been a remarkable spread of white boards or sheets that can be written on and erased repeatedly without using paper that stains hands.In particular, electronic blackboards are used to store information written on white writing sheets. Since it is possible to reduce the size of the copy to an easy-to-handle size such as A4 on the spot, there is no need to take notes each time a meeting is held, and the efficiency of meetings and seminars is dramatically increased, making it popular in various fields. Bathing.

The information to be written on the writing sheets used as surface materials for electronic blackboards, whiteboards, etc. is not just text, but also includes many figures such as tables, graphs, and illustrations. On the erasable resin layer or support layer, for example, a monthly calendar, with sublimable dye ink,
A method for manufacturing writing sheets with base printing was proposed by overlapping the printed surfaces of original sheets with base printing, such as blank maps of Japan, golf score sheets, etc., with base printing mainly based on so-called format printing, and thermally transferring the printed images. ing.

[Problems to be solved by the invention]

Because the required formats for base printing such as formats are divided into various formations, it is inevitably necessary to produce a wide variety of products in small quantities, and in addition, it is necessary to locally change a small part of the format screen according to the customer's preference. However, in such cases, conventionally, the original plate used for printing on the original sheet had to be made again, which inevitably required a great deal of time and effort and increased costs.

Note that base printing as used in the present invention refers to so-called format printing as mentioned above, but more specifically, it refers to shapes, tables, etc. that are applied on the surface of the writing sheet in advance according to the customer's preferences and uses. ,
It refers to all printed images such as line drawings such as letters and numbers, solid printing, halftone printing, etc. having arbitrary area and shape. In addition, in this case, solid printing and halftone dot printing of any area and shape include a wide range of printed images, including, for example, the entire printing of one screen of a writing sheet.

[Means for trying to solve problems]

The present invention was developed as a result of various studies to solve the above-mentioned difficulties, and when it is desired to change or add a part of the base printing according to the general pattern, it is possible to An original sheet with a base print is provided with an individual pattern display area using sublimation dye ink or paint that incorporates the customer's special requirements, and this is used to create a writing-erasable resin on a writing sheet. The writing sheet is produced by thermally transferring the printed image of the original sheet onto a layer or support.

Here, the means for applying the above-mentioned individual pattern display portion to the original sheet is to first place the individual pattern print using sublimation dye ink or paint at a predetermined position on the original sheet on which the regular base printing has been performed. This can be easily done by pasting or directly drawing out using sublimation paint ink.

To explain in more detail the pasting of individual pattern printed matter among the above, () print it on the entire surface of a base material such as paper with sublimation dye ink or print it in a specific shape, or () print it in a specific shape with sublimation dye ink. Either make a dye paint that is coated on the entire surface of a substrate such as paper or coated in a specific shape, or () develop a sublimable dye-containing toner on the substrate completely or in a specific shape using an electrophotographic method. Create something that sticks and the above ()
() A specific (desired) pattern is cut out or punched out from the material produced by (), and this is pre-formatted as a standard pattern.The blank area of the original sheet is printed with a base print image by a method such as offset printing. Cut and paste.

At this time, unnecessary portions of the regular pattern may be erased by masking, or may be pasted while being masked during pasting.

The support constituting the writing sheet in the present invention is usually a sheet-like material colored white so that it can be clearly read when written on the surface of the writing sheet with a colored marker. Milky white polyester film, transparent polyester film with a white pigment layer, white coated paper, synthetic paper, etc. are used, but milky white polyester film of 100 to 150 μm is relatively suitable for use in terms of hardness and handling. Ru.

The writable and erasable resin layer may be, for example, a transparent fluorine-based resin film, a plastic film having a coated layer of fluorine-based or silicone-based resin, polypropylene, etc., from which information written with a marker can be easily erased with an eraser. It may be formed by bonding a film such as polyethylene to a support, or it may be formed by providing a coating layer of ultraviolet curable unsaturated polyester resin, heat-curable silane resin, acrylic resin, etc. on the support. You may.

In this case, an adhesive such as polyester polyurethane, which is commonly used as an adhesive for dry lamination, is used to bond the support and the writable film. In addition, without using an adhesive, for example, the support and the film surface may be given an adhesive function in advance and then bonded together by heating, pressure bonding, or the like. Further, the writable and erasable resin can be applied to the support by a conventional coating method such as a reverse roll coater or a wire doctor.

Furthermore, the sublimable dye ink used for base printing of formats, etc. 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 anthraquinone dyes such as CIDisperse Blue3 as a blue dye, and CIDisperse Violet12 as a purple dye.
Azo dyes such as CIDisperse, anthraquinone dyes such as CIDisperse Violet4, red dyes such as CIDisperse
Azo dyes such as Red17, anthraquinone dyes such as CIDisperse Red4, CIDisperse as an orange dye
Azo dyes such as Orange3 are applied.

In addition, the resins constituting the vehicle component include ethyl cellulose, hydroxyethyl cellulose,
Cellulose acetate propionate, alkyd resin, polyvinyl alcohol, etc. are used, and
Solvents 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, for example, by the following method.

First, a sheet is prepared by laminating a writable and erasable film onto a support made of a milky white polyester film or the like by a dry lamination method using a predetermined adhesive or the like.

On the other hand, a predetermined format is printed on a base material such as paper using a normal printing method such as lithographic printing or gravure, or a toner (plate ink) containing a sublimable dye is used. An original sheet is created by forming an arbitrary image using an electrophotographic method and performing base printing.
In this case, the format is printed as a reverse image on the original sheet so that it becomes a normal image after thermal transfer.
Further, 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.

In this case, the present invention further uses sublimation dye ink or paint to display individual patterns by the means described above.

After that, if the printed side of the original sheet is superimposed on the film surface of the sheet made by laminating the writable and erasable film and bonded under heat, the sublimable dye ink and the sublimable dye in the same paint are sublimated onto the film side. Let it be transcribed.

In addition, in the present invention, when the writable and erasable resin layer is composed of a thick and stiff material of 50 to 300 μm, such as a non-polar, writable and erasable plastic film, the support can be omitted without any problem. Of course it can be done.

The conditions for the heat-pressure transfer described above vary depending on the composition of the sublimable dye and the material of the film, but are generally from 180° to
The writing sheet of the present invention can be obtained by pressing each screen at a temperature of 200° C. with a hot plate or by continuously heating and pressing with a hot roll.

Although the above description is about transfer to a writable and erasable surface, it goes without saying that the same thing may be done for a support.

Due to the strong penetrating power of the dye molecules, the images printed (transferred) in this way, including regular format base print images and individual patterns made of sublimable dyes, are not only merely superficially colored on the transferred surface. , it penetrates into other internal layers and prints with excellent abrasion resistance.

The writing sheet of the present invention obtained as described above is
It can be used as a long piece for several screens or endlessly processed to make an electronic blackboard, or it can be pasted onto a board surface such as plywood or metal plate and used as a whiteboard, or it can be used without any processing. You can also use it as a simple writing sheet by cutting it to an appropriate size and pasting it on a bulletin board or wall.

Example Examples will be described below.

Example 1 A support made of milky white polyester with a thickness of 125 μm and a writable and erasable film made of a tetrafluoroethylene/ethylene copolymer film (Afrex, manufactured by Asahi Glass Co., Ltd.) with a thickness of 21 μm were combined into an adhesive having the following composition. A bonded sheet was created by dry laminating using the coating liquid.

Polyester polyurethane resin (Takerak)
A540 manufactured by Takeda Pharmaceutical (solid content 60%) 100 parts by weight Isocyanate curing agent (Takenate A50 manufactured by Takeda Pharmaceutical solid content 70%) 12 parts by weight On the other hand, from 6 parts by weight of anthraquinone disperse dye and ethyl cellulose, ethyl alcohol and ethyl acetate Using a sublimable dye ink with a vehicle component of 94 parts by weight, a blue grid-shaped base is printed on high-quality paper using an offset printing machine, and the company name is printed separately in the margin using a similar sublimable ink. I created an original sheet (negative drawing) with (paper) pasted on it.

The printed surface of the original sheet thus obtained was superimposed on the writable and erasable film surface, and the base image was transferred onto the film surface using a heating transfer device at 200° C. to create the writing sheet of the present invention.

When I applied this writing sheet to an electronic blackboard, used a special marker to write information such as various letters and numbers using normal operations, and made a reduced copy, the written information, including the company name, was clearly displayed in a grid-like format. A copy was obtained.

Even if written information such as letters and numbers was erased again using an eraser, the heat-transferred base print image, such as the format, remained extremely stable without being erased.

Example 2 A support made of white art paper with a thickness of 140 μm and a writable and erasable film made of a tetrafluoroethylene/ethylene copolymer film (Afrex, manufactured by Asahi Glass Co., Ltd.) with a thickness of 21 μm were used in Example 1. A laminated sheet was created by dry lamination using the adhesive coating solution obtained.

On the other hand, 15 sublimable dyes consisting of the following four color combinations
Using a sublimable dye ink consisting of 85 parts by weight and a vehicle component consisting of ethyl cellulose and ethyl alcohol, a black blank map of the world was printed on high-quality paper using an offset printing machine to produce a regular original sheet.

Yellow dye (naphthoquinone type) 30 parts by weight Red dye (anthraquinone type) 15 parts by weight Blue dye (anthraquinone type) 20 parts by weight Purple dye (anthraquinone type) 35 parts by weight The names of the major countries are written in the margin of this standard original sheet. An original sheet was created by pasting a print using the same sublimation ink on paper.

Using this original sheet, an image was transferred onto a writable and erasable film surface in the same manner as in Example 1 to create a writing sheet according to 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 as a base printed material for a blank world map and the names of major countries.

Example 3 A write-erasable film consisting of a support made of a 125 μm thick opalescent polyester film and a 21 μm thick tetrafluoroethylene/ethylene copolymer film (Afrex, manufactured by Asahi Glass Co., Ltd.) was prepared in Example 1.
A bonded sheet was created by dry laminating using the adhesive coating solution used in .

On the other hand, 15 parts by weight of each of the azo black sublimable dye and the black sublimable dye used in Example 2 and 85 parts by weight of the vehicle component used in Example 2 were kneaded to form two types of red and black. Two colors, red and black, are printed on high-quality paper by an offset printing machine using sublimation ink.
Base printing using color (for example, a golf score entry form) was performed.

The name of the golf course and the name of the competition were handwritten (negative) using the same sublimation ink to create an original sheet.

The printed surface of this original sheet was superimposed on the writable and erasable film surface, and the two-color base print image was transferred onto the film surface using a heating transfer device at 200° C. to produce a writing sheet of the present invention.

This writing sheet was applied to a heat-sensitive electronic blackboard with a color reading mechanism and two-color recording, and after writing the score with a marker, a reduced copy was made and a golf score using two colors was printed on the original sheet. was clearly copied along with the golf course name, competition name, etc. Furthermore, even after repeated erasing with an eraser, the transferred format and golf course name were not erased from the original sheet and remained stable.

Example 4 Using a sublimable dye ink consisting of 6 parts by weight of an anthraquinone disperse dye and 94 parts by weight of a vehicle component consisting of ethyl cellulose, ethyl alcohol, and ethyl acetate, a blue grid-shaped base print was applied to high-quality paper using an offset printing machine. An original sheet with a fixed shape was created.

In the margin of this regular original sheet,
An original sheet of the present invention was created by pasting an individual sheet with the name of the creator of the drawing printed on another piece of paper using the same sublimation ink.

Base printing surface and thickness of the original sheet obtained
The surfaces of supports made of opalescent polyester having a thickness of 125 .mu.m were superimposed, and the underprint image of the sublimable dye was transferred onto the surfaces of the supports using a heating transfer device at 200.degree.

Next, the base printed surface of the support made of opalescent polyester and a writable and erasable film made of a tetrafluoroethylene/ethylene copolymer film (Afrex, manufactured by Asahi Glass Co., Ltd.) with a thickness of 21 μm were bonded together using the same bonding method used in Example 1. A writing sheet of the present invention was prepared by dry laminating using a coating solution.

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

〔Effect of the invention〕

The present invention has the above-mentioned configuration, in which the base printing, such as a format consisting only of regular regular parts, is mass-produced until it is printed on the cardboard of the original sheet, and the individual parts are printed on the mass-produced original sheet. It can be attached by simple means such as pasting a partial print or handwriting using a , and the rest can be thermally transferred to a writing sheet in the same way as before, so it is possible to add individual markings. There is no need to separately produce a base printed material, and a writing sheet that easily meets the customer's individual requirements can be provided relatively easily and at a low cost.

Claims (1)

[Scope of Claims] 1 The printed surface of the original sheet, which has been printed with a sublimation dye ink base, is superimposed on the writable and erasable resin layer or support of the writing sheet, and the printed image is thermally transferred so that writing can be performed. In a method for producing a writing sheet in which a base printing is applied to a writing sheet, the original sheet and the base material are subjected to regular base printing by a predetermined printing means, and furthermore, an individual pattern is displayed on this using sublimation dye ink or paint. A method for manufacturing a writing sheet characterized by providing a section. 2. As a means of forming individual pattern display parts, printing by full-surface printing or full-cover coating on a substrate using sublimation dye ink or paint, or by pasting cut-outs of such printed coatings is claimed in claim 1. Method for manufacturing the writing sheet described. 3. A method for producing a writing sheet according to claim 1, in which a sublimation dye ink or paint writing means is used as a means for forming the individual pattern display portions.