JPH02155794A - Thermal transfer recording medium - Google Patents

Abstract

PURPOSE:To enable attainment of the expression of gradation excellent in reproducibility on the occasion of thermal transfer by a method wherein hot-melt ink applied on a substrate is formed of a minute part of application and a part of non-application which are present randomly in the part of application of the ink. CONSTITUTION:There are a part 111 of application of hot-melt ink and a part 113 of non-application thereof on the surface of the hot-melt ink 101 applied on a substrate 102. For the principal part 112 of the substrate 102, a substance such as polyethylene terephthalate, polyamide, polyimide or polyether sulfone, which is provided for an ordinary thermal transfer substrate such as condenser paper, is used. In this way, the hot-melt ink applied on the substrate 102 is formed of the minute part 111 of application thereof and part 113 of non- application thereof which are present randomly in the part 101 of application thereof. Therefore, the expression of gradation being excellent in reproducibility can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a thermal transfer recording medium used in a thermal transfer printer.

[Prior art] In conventional thermal transfer recording media, all transfer areas are coated, except for pinholes that occur suddenly. [Problems to be solved by the invention] However, in the conventional technology described above, thermal transfer The problem is that the reproducibility of gradation expression is poor.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a thermal transfer recording medium that can express gradations with excellent reproducibility during thermal transfer.

[Means for Solving the Problems] The thermal transfer recording medium of the present invention has a heat-melting ink coated on a base material, which randomly forms minute coated portions and uncoated portions in the coated portion. It is characterized by consisting of.

[Function] According to the above-described structure of the present invention, there is an effect that a thermal transfer recording medium is provided which can perform a grade FA expression that is inconsistent with reproducibility during thermal transfer.

[Example] The present invention will be explained in detail below using Examples and Comparative Examples.

An example is shown in FIG. FIG. 1 shows the surface state of the heat-melting ink (101) coated on the base material (102). Further, 111 and 113 are enlarged views of the main parts of 112. 111
115 indicates a portion coated with hot-melt ink, and 115 indicates a portion not coated with the same. Reference numeral 112 is an enlarged view of the main part of the base material 102, and there is no problem as long as it is used for ordinary thermal transfer base materials such as polyethylene terephthalate, polyamide, polyimide, polyether sulfon, and capacitor paper.

Next, as a comparative example, the state of the coating surface of a conventional heat-melting ink is shown in FIG. 201 is a heat-melting ink, and 202 is a base material. Further, 211 is an enlarged view of the main parts of 201 and 212 is an enlarged view of the main parts of 202. In Fig. 2, there is a heat-melting material created with the intention of showing 115.

No ink-uncoated areas are observed.

Table 1 shows the compositions of the hot-melt inks used in Examples and Comparative Examples of the present invention.

g1 In Table 3, (α) is the gradation characteristic of the present invention, and (h) is the gradation characteristic of the prior art. It can be seen that (α) shows an extremely gentle concentration change compared to Cb). That is, it is easy to control the transfer density by the transfer energy, and as a result, Fj
This means that it is easier to obtain a transcript with excellent reactivity.

In FIG. 5, the vertical axis represents the maximum value of f and the normalized reflection OD of o, and the horizontal axis represents the transfer energy.

[Effects of the Invention] As described above, according to the present invention, the heat-melting ink coated on the base material is dispersed in the coated area from [disorderly minute coated areas and uncoated areas]. A thermal transfer recording medium characterized by the following is effective in expressing gradations with excellent reproducibility.

A diagram showing the state. Also, 211 is 201 and 212 is 202
It is an enlarged view of the hair part.

FIG. 3 is a diagram showing gradation characteristics, in which (α) shows the characteristics of the present invention, and Cb) shows the characteristics of the prior art.

that's all

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and shows a base material (102
) A diagram showing the surface condition of the heat-melting ink (101) coated on the top. Further, 111t115 is an enlarged view of the main part of 112. 111 is a section coated with heat-melting ink, 113 is a section not coated with heat-melting ink, and 112 is an enlarged view of the main part of the base material 102.

Claims (1)

[Claims] 1. A thermal transfer recording medium characterized in that a heat-melting ink coated on a base material is randomly composed of minute coated parts and uncoated parts.