JPS62128793A - Heat-sensitive ink-transfer sheet - Google Patents

Abstract

PURPOSE:To execute the multi-color or full-color recording of a good quality on even the paper to be transferred of 200sec max. in smoothness as well as a postcard, by forming an ink-transfer stabilization layer at the top of each three colors on an ink-transfer sheet aside from the ink layer of three colors. CONSTITUTION:The ink-transfer stabilization 3 part of an ink-transfer sheet 1 receives the heat of a thermal head in a state where it is piled on the paper to be transferred and the ink-transfer stabilization layer 3 is transferred. In that case, because the ink-transfer stabilization layer 3 is better in fluidity than an ink layer 4 the surface depressed part of the paper to be transferred is filled, the smoothness as the paper to be transferred increases and at the same time, the adhesion to each color becomes good. Then, the paper to be transferred to which the ink-transfer stabilization layer 3 is transferred returns to the initial position. At the same time, the top of the yellow 4a of the ink- transfer sheet 1 is taken out and the ink of the yellow 4a is transferred to the ink-transfer stabilization layer 3 on the paper to be transferred. Thereafter, by repetition of the same operation to a magenta 4b and a cyan 4c, the color recording of a good printing quality can be executed on the paper to be transferred of a low surface smoothness.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transfer sheet for a thermal transfer recording device used for multi-color or full-color recording.

2. Description of the Related Art Conventionally, this type of thermal transfer recording apparatus has been disclosed, for example, in Japanese Patent Application Laid-Open No. 1986-
As shown in Japanese Patent No. 140267, the configuration was as shown in FIG.

That is, when obtaining multi-color or full-color recording, a thermal head 20 that selectively generates heat according to a signal, a transfer sheet 21 on which ink layers of at least three colors of yellow 21a, magenta 21b, and cyan 21c are sequentially formed are used. Using a transfer paper 22, the transfer paper 22 is moved back and forth for each ink on the transfer sheet 21, and three color inks are superimposed on the transfer paper 22, thereby performing multicolor or full-color recording.

Problems to be Solved by the Invention Generally, in a thermal recording method using a transfer sheet 21, the surface smoothness of the transfer paper is important, and if the smoothness is low, that is, the surface of the transfer paper is highly uneven, the ink transfer will be poor. This results in poor print quality, which is an important problem in color recording, especially in full-color recording.

Therefore, in the case of thermal transfer recording, even monochrome recording has a Peck smoothness of 200 seconds or more, and multicolor recording has a smoothness of 500 seconds or more.
A duplex transfer paper with a smoothness of 2 seconds or better is recommended.

However, recently there has been a desire for color recording on general paper to be transferred, such as postcards and paper for copying machines, but there has been a problem that high-quality recording cannot be achieved because the smoothness is as low as 100 to 200 seconds.

In other words, in the case of high-quality copying machine paper with a smoothness of about 150 seconds, the recesses on the surface (viewed from the transfer sheet side) are about 20 μm, and even when heated with a thermal head, the surface temperature of the recesses is 4.
It is said to be below 0'C (2nd Non-Impact Printing Technology Symposium Proceedings, 85), and at such temperatures even when using melting pigments whose transfer temperature is as low as 60-70°C, they will not be exposed to heat. It will not be transferred to the transfer paper.

Therefore, the present invention provides a transfer sheet that can perform high-quality multi-color or full-color recording even on paper having a smoothness of 200 seconds or less, including postcards. In addition to the ink layers of the three colors, a transfer stabilizing layer is formed on the transfer sheet at the beginning of each of the three colors.

For production The effect of this means is as follows.

In other words, before overlapping the three color ink layers on the transfer paper, a transfer stabilization layer is transferred onto the transfer paper, and after the unevenness of the transfer paper surface is covered, the three color ink layers are overlaid. This makes it possible to perform color recording with better print quality.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIGS. 1 and 2, 1 is a transfer sheet, and at least yellow 4a, magenta 4b,
An ink layer 4 consisting of three colors, cyan 4c, and a transfer stabilizing layer 3 are formed in front of the ink layer 4 for each of the three colors.

For example, if the ink layer 4 is of a meltable pigment type, the transfer stabilizing layer 3 is made of the same wax-based binder as the pigment, or a wax mixed with a resin that has good affinity with the pigment. has been done.

In addition, if you want to record with good print quality, the transfer stabilization layer 3 needs to have a thickness equivalent to at least the depth of the surface recesses of the transfer paper, and for high-quality paper for copying machines, the transfer stabilization layer 3 should have a thickness of 10 μm or more. Layer thickness is desired.

Next, the operation of the configuration of this embodiment will be explained.

When a recording start signal is input, first, the transfer stabilizing layer 3 portion of the transfer sheet 1 is placed in a predetermined positional relationship with the thermal head, receives heat from the thermal head while overlapping the paper to be transferred, and absorbs heat from the thermal head. The transfer stabilizing layer 3 is transferred to at least the entire printing area on the surface of the transfer paper.

At this time, since the transfer stabilizing layer 3 has better fluidity than the ink layer 4, the concave portions of the surface of the transfer paper are painted. Therefore, the smoothness of the transfer paper increases, and the ink layer 4
If the same wax as the binder is used, the adhesion to each ink layer 4 will also be good.

Next, the transfer paper to which the transfer stabilization layer 3 has been transferred returns to the initial position, and the yellow 4a of the transfer sheet 1 is cued up, and the yellow 4a ink is applied to the transfer stabilization layer on the transfer paper according to the data signal. Transferred onto 3. Thereafter, by repeating the same operation 9 times for magenta 4b and cyan 4c, it is possible to perform color recording with good print quality on transfer paper with low surface smoothness.

Effects of the Invention The present invention uses a transfer sheet in which ink layers of at least three colors of yellow, magenta, and cyan and a transfer stabilizing layer are repeatedly formed at the top of each of the three colors in color thermal transfer recording. By first transferring the transfer stabilizing layer onto the transfer paper and coating the concave areas on the surface of the transfer paper, it can be used even on transfer papers with low smoothness such as postcards or paper for copying machines. It is capable of recording in color or full color.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a thermal transfer sheet according to an embodiment of the present invention, FIG. 2 is a sectional view of the same thermal transfer sheet, and FIG. 3 is a perspective view of a conventional thermal transfer recording apparatus. 3... Transfer stabilization layer, 4... Ink layer,
4a...Yellow, 4b...Magenta, 4C
······cyan.

Claims (1)

[Claims] A heat-sensitive transfer sheet in which a plurality of color ink layers and a transfer stabilizing layer are sequentially formed on a base film, starting with the transfer stabilizing layer first.