JPS6024991A - Heat transfer recording method - Google Patents

Abstract

PURPOSE:To enable to obtain a clear image with high density and to transfer multiple times, by a method wherein an infrared ray absorbing region is provided on the side of a transfer sheet opposite to the original side, a receiving sheet is laid on the original side of the transfer sheet, and the resultant laminate is irradiated with infrared rays from the side of said region to form an image on the receiving sheet. CONSTITUTION:An original such as characters and patterns is drawn on the transfer sheet using a drawing means filled with an ink comprising a heat-sublimable dye. In this case, the original and the image to be formed on the receiving sheet are reverse to each other. A heat-nonsublimable ink comprision an infrared ray absorbing substance is applied to the side of the transfer sheet opposite to the original side. In this case, the infrared ray absorbing region is formed in correspondence with the original region by using a drawing means similar to the above. Then, the receiving sheet is laid on the original side of the transfer sheet, and the resultant laminate is irradiated with infrared rays from the transfer sheet side, whereby the infrared ray absorbing region of the transfer sheet is heated by the heat generated by the substance, and the heat-sublimable dye is sublimed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention 1 relates to a thermal transfer recording method for forming a positive image using a heat-sublimable colored dye.

Prior art A receiving sheet is placed on the dye layer side of a transfer supply sheet in which a dye layer containing a heat sublimable dye is provided on a support, and heated in an imagewise manner to form a transfer image of the heat sublimable dye on the surface of the receiving sheet. method is known. This method is advantageous in that the recording material used is easy to manufacture, the recording method is simple, and no noise is generated.

However, since the dye is not necessarily sufficiently transferred from the transfer supply sheet to the receiving sheet, it has been difficult to obtain clear images with high density. Also, it was not possible to perform multiple transfers.

Purpose The purpose of the present invention is to provide a thermal transfer recording method that can obtain clear images at 71 um and can perform multiple transfers.

Structure The present invention forms a transfer original image on a transfer sheet using a printing tool filled with ink containing a heat-sublimable dye, and a marking tool filled with a non-heat-sublimating ink containing an infrared absorbing substance. After forming an infrared absorbing area corresponding to the transfer original image area on the opposite side of the transfer sheet using the transfer sheet, and further overlapping a receiving sheet on the transfer original image side of the transfer sheet, light including p-infrared rays is emitted from the infrared absorbing area side of the transfer sheet. This is a thermal transfer recording method in which an image is formed on a receiving sheet by irradiation.

As the transfer sheet and the receiving sheet, any material having a solid surface can be used, such as cloth, paper,
Plastic film etc. are applied.

Heat sublimable dyes include disperse dyes, oil-soluble dyes, acid dyes,
There are various types of mordant dyes, mordant dyes, and basic dyes.

In addition to the above-mentioned dyes, the ink containing heat-sublimable dyes may also contain starch, gum arabic, methylcellulose, calxoxymethylcellulose, divinyl alcohol,
Adhesive substances such as sodium alginate can be added as binders. The proportion of this binder used is preferably in the range of 0.05 to 1.0 parts by weight per 1 part by weight of the dye. In addition, a lubricant such as ethylene glycol can be used in an amount of 5 to 30% based on the total weight part, and a known dispersant or surfactant can be used in an amount of 0.05 to 1.0 part by weight based on the dye. Can be used in

Further, silica, titanium oxide, calcium carbonate, aluminum hydroxide, urea-formalin resin, etc. can be used as fillers.

When producing ink containing heat-sublimable dyes, the above-mentioned dyes, binders, dispersants, fillers, etc. are usually processed using a wet pulverizer such as a Zeel mill or an attriter using water or an organic solvent such as a lower alcohol as a dispersion medium. Spread. However, if the particle size of the dye is small and the average particle size is 5 μm or less, mixing alone is possible.

As an infrared absorbing substance, black pigments or dyes such as carbon black, or metal oxides or metal sulfides may be used.
A material that has high absorption of infrared rays of 0 to 3000 nm can be used.

When producing a non-thermal sublimable ink containing an infrared absorbing substance, in addition to the above-mentioned infrared absorbing substance, a binder and the like are usually mixed and dispersed in a suitable external heating medium.

As the ff1t marking tool, one whose core material is a commonly known porous material such as felt is suitable.

To carry out the method of the present invention, first, letters, designs, etc. are written on a transfer sheet using a flower recorder A'e filled with ink containing a heat-sublimable dye. In this case, these original images and the images on the receiving sheet will be reverse images, so please prepare the transfer sheet (1) in advance.
It is best to write on one side of the paper using a lead pen, felt-tip pen, etc., with regular letters and designs, and then trace it with a chain mark filled with ink containing a dye that is transmitted through the surface.

Next, a non-thermal sublimation ink containing an infrared absorbing substance is applied to the surface opposite to the dye ink application surface.

At this time, an infrared absorbing area is formed so as to correspond to the transfer original image area using a tool similar to the marking tool used to fill the dye ink. Coating the entire surface of the transfer sheet is a waste of ink and is not preferred from the viewpoint of sheet safety.

A receiving sheet is then placed over the dye-coated side of the transfer sheet. Then, the transfer sheet side is irradiated with infrared rays. In this case, the infrared light has a dominant wavelength peak of 800 to 3
000 nm range is preferred. As the light source, a white lamp containing infrared light, an infrared ray lamp, a xenon lamp, a straw flash lamp, etc. can be used.

By this infrared irradiation, the infrared absorbing region of the transfer sheet is heated by the absorption heat of the infrared absorbing substance, and the heat sublimable dye is heated and sublimated. As a result, the dye adheres to the receiving sheet surface and an image is formed. A large number of copies can be obtained by replacing only the receiving sheet.

Effects According to the present invention, not only clear and high-density images can be easily obtained, but also a large number of copies can be made.

Example 1 Sublimation dye (Kaya Set Red) 026 Nippon Kayaku Co., Ltd.) 15-layer assembly section hydroxyethyl cellulose 10% aqueous solution 30 Silica 5 parts by weight Water 50 An ink was prepared by mixing and dispersing the mixture in a Zeel mill for 2 hours.

This ink is filled into a turtle marking tool (one with a valve structure),
An image was formed by hand on a transfer sheet (second hand 35 f/H? top bamboo paper). An ink containing Carzen Black was applied to the opposite side of the transfer sheet. The application was carried out using a writing instrument (manufactured by Risso Co., Ltd.) filled with ink.

Next, a government-made postcard was placed on the dye-coated side of the transfer sheet as a receptor sheet, and a thermal copying machine with a built-in infrared lamp (Ricoh Co., Ltd. R
-2) was used to perform infrared irradiation.

As a result, a clear red image appears on the receiving sheet.
Ta. Furthermore, by changing the receiving sheet and repeating the process, 30 clear copies could be obtained.

Example 2 Sublimation dye (Kayaron Fast Yellow-4R manufactured by Nippon Kayaku Co., Ltd.) 12-layer surfactant (
Demol N Kao Corporation N 8 Methyl cellulose 10%
An ink was prepared by mixing and dispersing 20 mW of water and 60 mW of water, and copying was carried out in the same manner as in Example 1 except that this ink was used, and 50 clear yellow copies were obtained. did it.

Claims (1)

[Claims] 1. Form an original transfer image on a transfer sheet using a silver marking tool filled with ink containing a heat sublimable dye, while using a 71cs marking tool filled with a non-heat sublimable ink containing an infrared absorbing substance. After forming an infrared absorption area corresponding to the transfer original image area on the opposite side of the transfer sheet, and further overlapping a receiving sheet on the transfer original image side of the transfer sheet, irradiate the infrared absorption area side of the transfer sheet with light containing infrared rays. A thermal transfer recording method in which an image is formed on a receiving sheet.