JPS587393A - Heat-sensitive transfer method - Google Patents

Abstract

PURPOSE:To perform heat-sensitive transfer while enhancing the adhesion of an ink layer with a recording paper and transfer properties, by a method wherein thermomelting colored materials coated on a base member in respectively different thicknesses are transferred plural times onto an object member by a thermal head. CONSTITUTION:A device for the heat-sensitive transfer is comprised of the thermal heads 17, 18, platens 24, 25, a recording paper 23 fed in the direction B by an external mechanism, a material consisting of a base member 20 and an ink layer 19 and a material consisting of a base member 22 and an ink layer 21 which materials are fed respectively in directions C, D by other external mechanisms, wherein the coated thickness of the ink layer 19 is smaller than that of the ink layer 21. By using said device, the ink 19 is transferred onto the paper 23 by the thermal head 17 to print one-dot lines 26 with spacings equivalent to the width of one-dot on the thermal head in the feed direction E of the paper, and further, the ink 21 is transferred onto the paper by the thermal head 18 to print one-dot lines 27 at said spacings.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention performs transfer KII multiple times, which is necessary when performing color printing using a thermal transfer method.

Conventional thermal transfer methods are mostly done in a single color.
It was rare for the image to be transferred onto the recording paper once it was printed. At this time, as shown in FIG. 1, the ink layer 1 as a heat-melting material and the recording paper 3 as a transfer object can be easily brought into close contact with each other by pressure from a thermal head 4 and a platen 5.

However, in the case of color printing, it is necessary to print with ink of at least the three primary colors of yellow, magenta, and cyan.Therefore, there are cases where the first printing is performed using one primary color ink, and then another pattern is printed on the Kuki Kama paper using a different taiwan color. occurs. At this time, the rC is transferred in the previous process and the ink becomes an obstacle, reducing the adhesion between the ink layer to be transferred in the subsequent process and the recording paper. This is not a problem when the ink 7 is transferred to the recording paper 9 in the previous process and transferred to the ink 6 in the subsequent process as shown in FIG. 2, but as shown in FIG. Ink 10 in the subsequent process is placed between the ink 9 transferred in the process.
is transferred, and the distance between the ink 9 transferred in the previous process is only the distance corresponding to one dot of the thermal head, rC is thermal hect 16 as shown in Fig. 4.
The ink layer 12 is heated by K
is melted.

Even if it expands, the ink 14 transferred in the previous process interferes with it, and the recording paper 15 does not come into close contact with the recording paper 15 completely, leaving an air layer in between. As is well known, in the thermal transfer method, the ink layer is heated and melted, and after coming into close contact with the recording paper, the ink layer leaves the base material and is transferred onto the recording paper. If the ink layer and the recording paper are not in close contact at this time, the melted ink will return to the base material and the transferability will be significantly impaired.

The purpose of the present invention is to prevent poor copying performance due to the decrease in adhesion between the ink layer and the recording paper as described above. The coating thickness of the ink layer transferred in the process can be made sufficiently thinner than the ink layer transferred in the subsequent process. To provide a next heat-sensitive method by increasing the thickness of transferred ink and improving the adhesion between the ink layer and recording paper when the transferred ink layer melts and expands in a subsequent process.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 5 is an enlarged side view of the main parts of the apparatus showing a preferred embodiment of the present invention, in which the recording paper is sent in the direction B by the thermal hect 17.18 and 12 ten z4.25 and the external mechanism. 25 and nine ink layers 19 and 21 coated on the paste material 20 and 22. The base material 20 - the ink layer 19 and the base material 2 are separated by another external mechanism.
2-The combination of ink layers 21 is n as the paper advances.
It is sent in the C1D direction. Thermal head 17,111
In this case, a thin film line head is used, and the decomposition force is about 2.7 dF i. Platen 24.25Fi diameter 4 [164 pieces,
Rubber hardness is 50. I paid 4 cents for Graten pressure 4 noodles. The printing pattern is as shown in Figure 6. First, the ink is 1? due to thermal hect 17 in the paper feed direction. One-dot lines 26 are printed at intervals corresponding to one dot width of the thermal head, and ink 21 is printed as one-dot lines 27 by the thermal head 18 during this period. A thermal printing ribbon (hereinafter abbreviated as printing ribbon) is used as a combination of base material 20.22 and ink 7ij19.21.
Colored Yeshi on condenser paper of A, thickness 5μ
There are two kinds of ribbons: one consisting of an ink layer (hereinafter referred to as the "yellow ribbon") and the other consisting of a 6μ thick ink layer colored cyan on a 12μ thick condenser paper (hereinafter referred to as the "cyan ribbon"). carried out.

In FIG. 5, if a cyan ribbon is used for the base material 20-ink 19 combination and a yellow ribbon is used for the paste material 22-ink 21 combination, the thickness of the ink layer of the cyan ribbon transferred in the previous step Because it is not thinner than the ink layer of the yellow ribbon to be transferred in the subsequent process (sufficient transferability is not obtained and the 1 ton line 28 does not become a line as shown in Fig. 7, but the pace in Fig. 5 By using a yellow ribbon for the combination of 20-ink 1! and a cyan ribbon for the combination of base material 22-ink 21, sufficient transferability can be obtained due to the effects of the present invention, and as shown in Fig. 8, sufficient transferability can be obtained in the post-process. 1 ton trine 2 printed
9 in a row.

As described above, according to the present invention, when transfer is performed multiple times in a thermal transfer method, the coating thickness of the heat-fusible material transferred in the previous process is equal to the coating thickness of the heat-fusible material transferred in the post-process. By making it thinner than the thickness, deterioration in transferability can be prevented even after multiple transfers.

[Brief explanation of the drawing]

Figure 1 is a diagram of the principle of the normal thermal transfer method, Figures 2 and 5 are explanatory diagrams showing an example of overlapping ink when printing is performed multiple times, and Figure 4 is a diagram showing the overlap of ink that has been transferred in the previous process. A principle diagram showing an example in which transfer is hindered by ink, Fig. 5 is an enlarged @ side view of the main part of the embodiment of the present invention, Fig. 6 is an explanatory diagram showing the printing pattern, and Fig. 7 is a diagram of the sixth case. FIG. 8 is an explanatory diagram showing an f14 sample in which the pattern of FIG. 6 is printed by the apparatus shown in FIG. 5. 17.18... Thermal head 19.21...
... Ink layer 20.22 ... Paste material 23 ... Recording paper 24.25 ... Platen 28 ... Printed non-continuously 1-dot line 29... 1 or more dot lines printed continuously Applicant Daini Seikosha Co., Ltd. Agent Patent Attorney Mogami Affairs 9111 Diagram @284 No. 3rIA I4rlA

Claims (3)

[Claims] (1) In a method of transferring a heat-melting colored material applied to a base material onto a transfer material using a thermal head, printing on the transfer material is performed by performing multiple transfers on the transfer material. Characteristic thermal transfer method. (2) A patent characterized in that, among the plurality of transfers, the coating thickness of the heat-fusible material transferred in the previous process is thinner and larger than the coating thickness of the heat-fusible material transferred in the subsequent process. A thermal transfer method according to claim 1. (3) The heat-sensitive transfer method according to claim 1, wherein a different color of the heat-melting colored material is used in each transfer so that color printing can be performed.