JPS62130893A - Thermal transfer ink sheet - Google Patents

Abstract

PURPOSE:To prevent a transfer trouble of rough surface patterns produced in an ink layer and scumming to reproduce a recording of sharp printing quality, by using a solid wax material having a specific value of penetration as a low- melting wax material forming a hot-melt ink layer in a thermal transfer ink sheet. CONSTITUTION:A thermal transfer ink sheet capable of repeated transfer is so constructed as to form a hot-melt ink layer 23 on a substrate 21 of polyester film through an intermediate adherent layer 22 of polyester resin and polyamide resin. In the hot-melt ink layer 23; a coloring agent, i.e. a dye of Kayaset black, and a low-melting wax material, i.e. Diacarna 30 of 3-5 penetration and a paraffin wax of 11 penetration, are mixed respectively 1, 2, and 1pt.wt., and further fine powder of carbon black having good cohesiveness is mixed, melted, and dispersed 0.8pt.wt. as a filler. With the hot-melt ink layer 23 containing the low-melting wax material of 1-15 penetration, a recording of sharp printing quality can be obtained with good reproducibility.

Description

[Detailed Description of the Invention] [Summary] The present invention provides a method for reducing the amount of damage that occurs on the surface of the ink layer of the thermal transfer ink sheet after transfer when printing is recorded by a thermal transfer recording device, facsimile, etc. using a thermal transfer ink sheet that can be repeatedly transferred. In order to prevent the rough surface pattern from being transferred as dirt onto the recording paper by sliding the rough surface pattern under pressure, the heat-melting ink of the thermal transfer ink sheet is used. By using a hard wax material with a penetration of 1 to 15 for the low melting point wax material that makes up the layer, clear print quality is recorded without transfer stains or background stains of rough patterns that occur on the ink layer. This makes it possible to obtain with good reproducibility.

[Industrial application field]

The present invention relates to a thermal transfer ink sheet used in a thermal transfer recording device using a thermal head or a facsimile machine, and particularly relates to an improvement in a thermal transfer ink sheet that can be repeatedly transferred.

One of the recording methods for thermal printers and facsimiles is the thermal transfer recording method. This is a recording paper such as plain paper guided by a platen, such as commonly used high-quality paper,
While the thermal head is pressed through a thermal transfer ink seal with a heat-melting ink layer provided on the support base, a plurality of heat-generating parts of the thermal head are selectively heated based on the printed information, and the heat-melting ink layer is heated. This method performs recording by transferring ink onto recording paper.

The above-mentioned thermal transfer ink sheet generally has a structure in which a heat-melting ink layer made of a coloring material and a low-melting wax material is provided on a base film, so the ink layer used for recording in - times of transfer recording is One-time thermal transfer ink sheets, which cannot be used multiple times due to missing parts, are widely used, but the cost of obtaining a record is high, and it is difficult to dispose of the thermal transfer ink sheets that are no longer needed after recording. This becomes a problem.

To solve these problems, thermal transfer ink sheets that can be used repeatedly have recently been developed, and various configurations have been proposed.

In such thermal transfer ink sheets that can be used repeatedly, the surface of the ink layer after transfer recording becomes a rough surface, and the thermal head presses the surface onto the recording paper simply by sliding on the rough surface. There is a problem in that the rough surface pattern is transferred as dirt and deteriorates print quality, and there is a desire to solve this problem.

[Conventional technology]

As shown in Fig. 2, the structure of a conventional thermal transfer ink sheet that can be repeatedly transferred is as shown in Fig. 2. Kayaset plaque is applied as a coloring agent onto a base material 1 made of, for example, a polyester film, through an intermediate adhesive layer 2 made of a polyester resin or the like. (Nippon Kayaku tA), 2 parts by weight of fatty acid amide wax as a low melting point wax material, 1 part by weight of paraffin wax, and a carbon blank with excellent cohesion as a filling material. It has a structure in which a heat-melting ink layer 3 is provided, in which 0.8 parts by weight of fine powder is melt-mixed and dispersed.

Note that the fine powder made of the carbon blank is not used as a black pigment in this case, but by mixing and dispersing this fine powder, the ink composition material made of the colorant and low melting point wax material on the substrate I becomes porous. It is formed into a sponge-like structure and serves as a medium for causing the ink composition material whose viscosity has been reduced by heat to be gradually released onto the surface of the ink layer 3.

Then, ink N3 of the thermal transfer ink sheet is printed on the recording paper.
With the surfaces stacked one on top of the other, a thermal pad is pressed against one surface of the base material, and the plurality of heat-generating parts of the thermal base material -/f' are selectively heated based on the printed information.
The ink composition material in the ink layer 3 is selectively heated and melted, and an amount of 1ξ passes through the surface of the ink layer 3, and only this exuded ink composition material is transferred to the recording paper, and transfer recording is repeatedly performed with good reproducibility. This makes it possible.

[Problem that the invention seeks to solve]

By the way, in a thermal transfer ink sheet with such a configuration,
During repeated use, the surface of the heat-melting ink layer 3 of the thermal transfer ink sheet after transfer is roughened in the shape of a printed pattern, and the thermal head presses the rough surface and simply moves tH to print it on the recording paper. However, there is a drawback that the rough surface pattern is transferred as a curvature, resulting in deterioration of printing quality.

This phenomenon is caused by the fact that the penetration of the low melting point wax material constituting the ink layer 3 is as high as 17 to 30, and the protruding portions of the rough surface pattern of the ink layer are brittle.

The above penetration is a measure of the hardness and consistency of wax materials, asphalt, etc., and as a standard according to JIS-2530, a specified needle with a load of 100g is applied to the sample at an environmental temperature of 25°C. (Low melting point wax material) It is expressed by the depth of a needle that is placed vertically into the sample for 5 seconds, and the unit is defined as 1, which is the depth of penetration of 0.1 mm.

Therefore, in order to solve this problem, the low melting point wax material that constitutes the heat melting ink layer of the thermal transfer ink sheet is mainly a solid low melting point wax material that is as hard as possible at room temperature, and a small amount of liquid is added to this material. A thermal transfer ink sheet has also been proposed in which a softening agent is added to prevent the above-mentioned stains. This has the disadvantage that the liquid oozes out onto the surface of the layer, resulting in deterioration of transfer recording characteristics.

In view of these conventional drawbacks, it is an object of the present invention to provide a new thermal transfer ink sheet that can provide high print quality without staining the printed records on the recording paper even after repeating transfer recording many times. It is something.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention uses a Kayascent blank (as a coloring agent) on a base material 2I made of a polyester film via an intermediate adhesive layer 22 made of a polyester resin and a polyamide resin, as shown in FIG. Nippon Kayaku!
1 part by weight of a dye consisting of
Parts by weight and penetration: 1 part by weight of paraffin wax (manufactured by Nippon Nenro) was mixed with 1 part by weight, and 0.0 part by weight of fine powder made of carbon black (manufactured by Tokai Carbon), which has excellent cohesive properties, was added as a filler. A heat transfer ink sheet capable of repeated transfer is provided with a heat melt ink layer 23 in which 8 parts by weight of the heat melt ink layer 23 is mixed, melted and dispersed.

[For production]

For example, the thermal transfer ink sheet of the present invention configured as described above, which can be repeatedly transferred, is made into a ribbon shape and installed in a serial thermal transfer printer, and while the thermal head is pressed onto the recording paper via the thermal transfer ink ribbon, printing pulses are applied. When transfer recording was performed repeatedly with a width of 1 ms and a printing energy of 3 On+J/mm2, the penetration of the low melting point wax material constituting the ink layer of the thermal transfer ink ribbon was 11 or less, which was harder than the conventional one. There is no transfer stain or background stain of the rough surface pattern that occurs in the ink layer, and it is possible to obtain clear print quality records with good reproducibility.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a main part for explaining an embodiment of a thermal transfer ink sheet that can be repeatedly transferred according to the present invention.

In the figure, 21 is a base material made of a polyester film with a thickness of 6 μm, and an intermediate adhesive layer 22 made of a polyester resin and a polyamide resin is placed on the base material 21 with a thickness of 3 μm.
Provided at a thickness of m.

Further, on the intermediate adhesive layer 22, for example, 1 part by weight of a dye made of Kayaset Blank (manufactured by Nippon Kayaku Co., Ltd.) is applied as a coloring agent, and Diakaruna 30 (manufactured by Mitsubishi Chemical Co., Ltd.) with a penetration degree of 3 to 5 is applied as a low melting point wax material. (manufactured by) 2it part and penetration: 11
1 part by weight of paraffin wax (manufactured by Nippon Seiro Co., Ltd.) was melt-mixed, and 0.0% of fine powder made of carbon black (manufactured by Tokai Carbon Co., Ltd.) with excellent cohesion was added as a filler.
8 parts by weight of the heat-melting ink layer 23 mixed and dispersed in 10 parts by weight.
A thermal transfer ink sheet with a thickness of μm that can be repeatedly transferred is provided.

Then, such a thermal transfer ink sheet is made into a ribbon shape and mounted on recording paper in a serial thermal transfer printer,
A thermal head is pressed onto the thermal transfer ink ribbon to apply printing energy of 30 J/mm2. Set the printing pulse width to 1
As a result of repeated transfer recording as ms, the penetration of the low melting point wax material constituting the ink layer 23 of the thermal transfer ink ribbon was 11 or less, which was harder than the conventional one, so it was difficult to transfer the rough surface pattern like the conventional one. It becomes possible to obtain clear quality print records with good reproducibility without stains or scumming.

Incidentally, the penetration degree of the low melting point wax material constituting the heat-melting ink layer of the thermal transfer ink ribbon of the above example:
Thermal transfer ink ribbon A, which can be repeatedly transferred, has an ink layer structure in which paraffin wax with a penetration level of 17 is used instead of paraffin wax with a penetration level of 11 (manufactured by Nippon Seiro Co., Ltd.), and all other components remain unchanged. Among the low melting point wax materials constituting the ink layer of the thermal transfer ink ribbon of the above embodiment, Diakarna 30 with a penetration degree of 3 to 5
(manufactured by Mitsubishi Kasei Corporation), using unbleached Montan with a penetration of approximately 1, and having an ink layer with all other components unchanged, the thermal transfer ink ribbon B can be repeatedly transferred.
, Further, the penetration degree of the low melting point wax material constituting the ink layer of the thermal transfer ink ribbon of the above example is 3 to 5.
Instead of Diakaruna 30 (manufactured by Mitsubishi Kasei Corporation), Paran Tsuku 104 with a penetration level of 6 is used, and a repeatable transferable thermal transfer ink ribbon C etc. having an ink layer with all other components unchanged is used. The results showed that when thermal transfer ink ribbon A was used, slight transfer stains and background stains of the rough surface pattern were observed when thermal transfer ink ribbon A was used. Regarding the other thermal transfer ink ribbons B and C, no stains were observed, and it was confirmed that clear print quality records could be obtained with good reproducibility.

〔Effect of the invention〕

As is clear from the above description, according to the thermal transfer ink sheet that can be repeatedly transferred according to the present invention, the penetration degree of the low melting point wax material constituting the hot melt ink layer of the thermal transfer ink ribbon is reduced to 15 or less, By hardening,
Transfer stains and background stains caused by rough patterns that occur in the heat-melting ink layer during repeated transfer recording are eliminated, and it has the excellent advantage of being able to obtain good print records with good reproducibility without deterioration of print quality.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts for explaining an embodiment of a thermal transfer ink sheet according to the present invention. FIG. 2 is a sectional view of a main part of a conventional thermal transfer ink sheet. In Figure 1,

Claims (1)

[Claims] A thermal transfer ink sheet comprising a heat-melting ink layer (23) consisting of a colorant, a low-melting wax material, and a filler provided on a base material (21) via an intermediate adhesive layer (22). A thermal transfer ink sheet, characterized in that the low melting point wax material constituting the heat melting ink layer (23) has a penetration degree of 1 to 15.