JPS62149490A - Thermoplastic magnetic ink medium - Google Patents

Abstract

PURPOSE:To enhance releasability of a base layer and transfer efficiency, by providing an undercoat layer between the base layer and a thermoplastic magnetic ink layer. CONSTITUTION:A thermal head 41, an ink medium 42, a transfer recording paper 46 and a magnet 47 are disposed in that order. A thermoplastic magnetic ink 45 of the ink medium 42 is brought into contact with the paper 46 when heat is applied by the head 41 from the side of a base 43, whereby the ink 45 thus melted is adhered to the paper 46, and then the ink medium 42 is released from the paper 46, thereby transferring the ink. When the thermoplastic magnetic ink medium 42 is constituted of the base layer 43, an undercoat layer 44 and the thermoplastic magnetic ink layer 45, and undercoat layer 44 weaken the adhesive force between the base layer 43 and the ink layer 45 when the ink layer 45 is thermally transferred onto the paper 46, so that the releasability of the base layer 45 is enhanced, and transfer efficiency is enhanced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a #1 printing apparatus for forming a visible image using at least a thermal energy supply means and a magnetic attraction force generation means.
Regarding ink media.

[Conventional technology]

Many small-sized, low-cost, non-impact printing methods using magnetic ink have been proposed.

In the method disclosed in Japanese Patent Application Laid-Open No. 52-96541, magnetic attraction force is applied to the ink corresponding to the thermal image by means of a magnetic attraction force generation means provided separately from the heat supply means to cause the ink to be transferred.

Furthermore, the ink medium used in this method is
There is 9-36596. This ink medium is! As shown in FIG. 2, it consists of a support 21 and a thermoplastic ink layer 23 held on the support layer 21.

[The problem that the invention attempts to solve]

However, in the above-mentioned conventional technology, when the vL transfer paper and the ink medium are pulled apart after transfer, it is difficult to remove the ink from the transfer section to transfer the ink to the thermal transfer paper. FA (adhesive force between ink and transferred paper), which acts as a force, and F
B (ink cohesive force).

The force that can prevent transfer is inferior to or equal to yo (adhesive force between ink supports) and FD (bonding force between recording area ink and non-recording area ink), so in short, FB, F'mu≦11'O
, FD, resulting in transfer defects such as the ink not being transferred to the transfer paper and being carried to the support.
It had some problems.

The effect was especially remarkable on V-& transfer paper, which had very poor surface smoothness.

The present invention has been made to solve these problems, and its purpose is to:

The transfer paper or ink has a very high affinity for 1) very high quality film, thermoplastic magnetic ink media that can print very high quality characters and images. It's there to provide.

[Means for Solving the Problems] The thermoplastic magnetic ink medium of the present invention is a thermoplastic magnetic ink medium in which ferromagnetic particles are contained in a thermoplastic organic substance.
11151E, which comprises at least a support 1Δ, a thermoplastic magnetic ink layer, and a thermoplastic undercoat layer that is solid at room temperature between the support 1- and the thermoplastic magnetic ink r-. It is characterized by

In addition, the thickness of the support layer is 1 to 30 μm, the thickness of the thermoplastic magnetic ink layer is 1 to 40 μm, and the thickness of the undercoat layer is 5 μrrL or less.

[Effect]

According to the above structure of the present invention, when the thermoplastic ink layer is thermally transferred to the transfer paper, an underknee layer of 1 m lowers the adhesive resistance between the support 1 and the ink layer, so the releasability is reduced. If it is good, it will have a Vh5 effect, i.e. yr B
, y A>IF c , F no relationship is achieved, and the transfer efficiency is improved.

[Practical]

The construction of the thermoplastic i-magnetic ink medium of the present invention will be explained with reference to FIG.

11 is a support layer, 12 is an undercoat layer, and 13 is a thermoplastic magnetic ink layer.

The support is made of a highly slippery material with heat resistance and mechanical strength.
Preferably, the material is a resin film such as linden, polyethylene, polypropylene, polyester, polyimide, polyether sulfone, or polyethylene terephthalate, and the thickness is 1 to 30 μm, preferably 1 to 15 μm.

As the binder for the undercoat layer and the thermoplastic FiIi ink layer, pack-in wax, microcrystalline wax, carnauba wax, oxidized wax,
Candelilla wax, Montan wax, Fischer, Tropsico wax, α-olefin/maleic anhydride copolymer content, fatty acid amide, fatty acid ester, distearyl ketone, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer epoxy resin, etc.F! %
Which of the finite substances exhibiting town plasticity or their rll
, is a compound.

The ferromagnetic 1L materials contained in the thermoplastic ink r@ include magnetite, manganese zinc ferrite, nickel zinc ferrite, and carnets.

Magnetic powder of gold aI or vsti alloy, etc., and the particle size is IOA to 100OOA, preferably 500A to 50
00A is good-1 There are two printing methods using thermoplastic magnetic ink media: a contact type (Fig. 4) in which the transfer part makes contact, and a non-contact type (Fig. 5).
It is roughly divided into 1m and 1m apart, and peeling occurs between the support 1- and the underknee 1m even in the case of misalignment.

Example 1 A thermoplastic pouring medium shown in Figure 1 was prepared and thermal printing was performed.

A thermal head was used as the thermal energy printing means and a permanent magnet was used as the magnetic attraction force generating means, and the printing method was a contact type (Fig. 4). To explain the top fit, as shown in Fig. 4, the thermal head (41) - ink medium (42) - transfer paper (46) - magnet (47) are installed in this order, 9. Gender ink (45) to thermal. When applying heat from the support (43) surface (directly below the head), the ink medium is brought into contact with the transfer paper and the melted ink is adhered to the transfer paper, and then the ink medium is peeled off from the transfer paper. , for ink transfer.

All 12 types of polyethylene terephthalate film and polyimide film were used as the support, and the parameters were as follows: undercoat layer composition, ink layer composition, undercoat 1-thickness, ink lfi thickness, and support layer composition. A thick thermoplastic magnetic ink medium was prepared.

Further example 1- Undercoat layer reorganization Paraffin wax (157F) Ichi Nippon Sekisen-50wtT.

Microcrystalline wax (Hi-M<c-104
5) - Nippon Seiho - 43wt% ethylene/vinyl acetate copolymer m II ("VA-57
7) - Mitsui DuPont Polychemical - 7wt% [thermoplastic m ink layer composition] Magnetite fine particles (100OA) - Taiho Industries - 40wt microcrystalline wax (Hz-Mic-104
5) - Nippon Seiho - 35 wt≠ Carnauba wax Ikko Fine Products 16 wt% ethylene/acetic acid and varnish copolymer resin (EjVA-577) - DuPont Mitsui Polychemicals - 5 wt% dye
3.9 wt% dispersant
0.1wt Qi row 2 - Undercoat layer composition Paraffin wax (145F) - Nippon Seiho - 95wt chetylene vinyl acetate copolymer resin (ETA-4IQ) - DuPont Mitsui Polychemicals - 5wt% ink 111 composition is Example 1 It's the same.

-Practical 3- Undercoat 1 - Assembly yield is the same as actual A row 1.

Ink layer composition magnetite fine particles (100OA) - Taihoe Tosaku - 4Q wt% paraffin wax (HNI) - 3) - Nippon Seiho - 36wt Chetylene-ethyl acrylate) (MBO8Q) - Nippon Unicar lQ wt% carnauba wax - Nikko Fine Products 10 wt% dye
3.9wt% dispersant
0.1wt - Sequence 4 - The undercoat composition and ink layer set W are the same as in Example 1.

In the above examples, Example 1 and Example 2 examine ink transfer efficiency due to differences in undercoat layer reorganization.
In Example 3, we investigated the transfer efficiency due to differences in the reorganization of the ink layer and the thickness of the support layer and ink 1-, and in Example 1 and Example 4, we examined transfer efficiency due to differences in the thickness of undercoat 1-. We considered efficiency.

- Comparison 1 - A conventional hot-machi plastic fIi-based ink medium consisting of a support layer 21 and a thermoplastic magnetic ink layer 23 as shown in Figure 2 was manufactured.

The ink layer composition is the same as in Example 1.

- Comparison row 2 - A comparison was made between Example row 1 and Example row 4, in which the undercoat layer was made thicker.

The composition of Undercoat I-, Ink 1 scratch is the same as in Example 1.

The above 11 comparison rows were printed using a sam magnet with a permanent magnet of 5% and a large energy product of 25MGO6 as transfer conditions, and an applied energy of 0.5mj/dot using a thermal head with a resolution of 180DP. On the transfer paper,
Rough paper with Veracmo smoothness of 30 seconds, 10 seconds, and 3 seconds was used.

The printed samples were evaluated in terms of transfer rate and dot reproducibility, and the results are shown in Table 1.

Further, each sample was printed solidly, and immediately after printing, Y-shaped peeling was performed from the O edge of the thermal head, and the peeling force was measured. The results are shown in A.2.

As shown in Table 1, the thermoplastic tIi ink medium provided with the undercoat layer of the present invention has a slipperiness of 30 seconds.

Both the 10 second and 3 second rough papers showed excellent transfer rates and dot reproducibility, and were able to print with very high quality. Furthermore, similar results were obtained even when the support was changed. At this time, the optimal thickness of the undercoat layer is 5 μm or less, and if it exceeds it completely, it will be a problem! This is undesirable because it may peel off during printing or storage due to a decrease in adhesion with the body layer, an increase in mechanical fragility, etc., and this may cause defects such as smudged characters, and it is also undesirable for dynamic printing. This is not possible for printing.

Similarly, for Ink 1-, if the thickness exceeds 40 .mu.mf, problems such as peeling and cracking will occur, which is impossible in Amagawa's view.

1.

Table 2 Comparatively, the ink medium from Nioi was considerably inferior in that it could not print with good reproducibility on rough paper for 10 seconds and 3 seconds, remained on the support, and had small dots.

The above reason is also supported by the fact that, as shown in Table 2, the peeling force of the thermoplastic sensitive ink medium of the present invention was reduced to about A compared to the conventional ink medium, and the peelability was improved.

Although the contact type printing method has been described above, the magnetic ink medium of the present invention was able to realize high quality printing with excellent transfer efficiency even in the non-contact type.

Further, the heat generating means can provide the same effect not only in the T-maru head but also in the 4-ton head.

In addition, it is also possible to use a magnetic attraction means against the stone.
Not even 5.

〔Effect of the invention〕

As described above, according to the present invention, by providing an undercoat layer between the support 1- and the thermoplastic ink layer, the releasability of the support layer is improved, that is, the transfer efficiency is improved. It is said that the printing speed is significantly improved, making it possible to print very high quality marks even on transfer paper with very poor surface roughness (I7i smoothness of 3 seconds) or on films that do not have a very high affinity with ink. W effect.

Furthermore, since the thermoplastic magnetic fluxing medium of the present invention has excellent releasability, it is possible to reduce the peeling force and increase the printing speed.

[Brief explanation of drawings]

Structure Figure 1 is an explanatory diagram of the thermoplastic injectable ink medium of the present invention. FIG. 2 is an explanatory diagram of a conventional magnetic ink medium. Figure @3 is a diagram showing various forces that act on ink when an ink medium is peeled off in a general thermal transfer method. Figure 4 is a diagram showing the principle of printing the ink medium of the present invention using a contact printing method. FIG. 5 is a diagram showing the principle of transferring the ink medium of the present invention by a non-contact printing method. 11 , 21 , 31 , 43 , 55 ... Support layer 12 , 44 , 56 ... Undercoat layer 1
3, 23, 3s, 45, 57...Thermoplastic t! EfB ink layer A, 46, 58... Transfer paper 47, 58 - Meeting permanent magnet 42, 52... Thermoplastic ATI ink medium or more Applicant Seiko Epson Co., Ltd. Agent Patent attorney Collection top J* c# 1 person) Figure 2 FA Fs Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] A thermoplastic magnetic ink medium having a thermoplastic magnetic ink layer containing 1) ferromagnetic particles in an organic material exhibiting thermoplasticity, comprising at least a support layer, a thermoplastic magnetic ink layer, and the support. 1. A thermoplastic magnetic ink medium comprising a thermoplastic undercoat layer that is solid at room temperature between the thermoplastic magnetic ink layer and the thermoplastic magnetic ink layer. 2) The thickness of the support is 1 to 30 μm, the thickness of the thermoplastic magnetic ink layer is 1 to 40 μm, and the thickness of the undercoat layer is 5 μm.
2. The thermoplastic magnetic ink medium according to claim 1, wherein the thermoplastic magnetic ink medium has a particle size of .mu.m or less.