JPH0238390B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a thermal transfer recording method in which a colored component is transferred from a thermal transfer recording medium to a recording paper by heating from a heating head, and a printed image is formed on the recording paper. This invention relates to technology for erasing printed images.

In recent years, thermal printers have been used not only for computer terminals and facsimile machines, but also for typewriters. In typewriters, typos are bound to occur due to human operations, so it has become necessary to correct the typos, so regular mechanical typewriters are required to correct them. We are starting to see things equipped with a mechanism.

When applying a thermal printer to a typewriter, it has excellent advantages such as being noiseless, compact, and lightweight, but if a typo occurs, the correction material can be used as is. Therefore, a correction material with a heat-sensitive transfer function that can be used with a thermal printer is required.

Such thermal printers usually overlap a copy sheet such as plain paper with a thermal transfer ribbon or sheet, which has a heat-melting ink layer containing a coloring material (dye or pigment) on the base material, and then print using a heated head. The heat-melt ink layer is then melt-transferred onto a copy sheet in the form of a printed image.

In order to correct images printed by mistake in such thermal printers, methods such as scraping off the erroneous image with a sand eraser or applying white paint on the erroneous image are usually adopted. In addition to damaging the paper, it is difficult to completely erase printing ink that has penetrated deep into the paper, and the operation is extremely complicated.
In the latter case, depending on the solvent used in the white paint or the type of printing ink to be corrected, the coloring material may elute and contaminate the repaired area, and the coating solution may dry completely after correction. It has the disadvantage that it is not possible to print again until the condition is reached, and it is not completely satisfactory.

The present invention has been completed in order to eliminate the above-mentioned drawbacks and to provide a new correction member that can extremely easily and reliably correct an erroneous image printed by a thermal printing means such as a thermal printer. be.

That is, the present invention provides a thermal transfer type correction member in which a heat-sensitive melt transferable opaque white ink layer is provided on a base material, in which a white pigment that makes the opaque white ink layer opaque is mixed and dispersed in a thermoplastic resin binder material. The gist of the present invention is a thermal transfer type correction member in which the opaque white ink layer is formed by laminating an opaque white agent layer made of a wax-like material and a heat-sensitive transfer layer made of a wax-like material.

The correction member of the present invention will be explained below using the drawings.

FIG. 1 is a schematic cross-sectional view showing one embodiment of the correction member of the present invention, and FIG. 2 is a schematic explanatory view showing a correction operation using the correction member shown in FIG.

The thermal transfer type correction member shown in FIG.
An opaque whitening agent layer 3 and a heat-sensitive transfer layer 4 are laminated thereon in this order.

The thermal transfer layer 4 and the opaque white agent layer 3 shown in FIG. 1 constitute the white ink layer 2, and the opaque white agent layer 3 and the thermal transfer layer 4 are sequentially laminated on the substrate 1. has been done.

As shown in FIG. 2, the correcting member of the present invention, when correcting, overlaps the copy sheet 6 having the erroneous image 5 so that the erroneous image 5 and the white ink layer 2 face each other, and 1 or the back side of the copy sheet 6.
As a result, the white ink layer 2a at a predetermined portion is melted and transferred onto the erroneous image 5. That is, the white ink layer 2a is melted at a predetermined portion of the heat-sensitive transfer layer 4 by the heating member 7, and is transferred onto the false image 5 together with the opaque white agent layer 3.

Thus, the false image 5 is covered by the white ink layer 2a, and the white ink layer 2a has a sufficiently smooth surface that it does not interfere with the adhesion of the correct image (not shown) to be reprinted. Never.

The heat-sensitive transfer layer 4 in the present invention imparts heat-melting properties to the white ink layer 2, and is made of a powdery thermally conductive substance, a heat-melting transferability imparting agent, a binder material, a filler, and the like. .

As a powdered thermally conductive material, the thermal conductivity is 6.0.
×10 ^-4 ~25.0×10 ^-4 cal/sec・cm・℃,
Materials with good thermal conductivity, such as metal powders such as aluminum, copper, tin, or zinc, are effectively used.
Such a thermally conductive substance promotes the heat conduction effect of melting and softening the heat-sensitive transfer layer 4 provided on the base material 1, and can shorten the time for the ink to melt and soften. be.

As a heat-melting transfer material, the penetration is 10 to 30 (25
It is preferable to use a solid wax with a temperature of 15°F (°C) in order to improve the transferability of the resulting heat-sensitive transfer layer 4. For example, waxes such as wood wax, beeswax, ceresin wax, spermaceti wax, etc. are used, but if necessary Depending on the situation, easily heat-meltable substances such as low molecular weight polyethylene, oxidized wax, and ester wax may be used in combination. Furthermore, thermoplastic resins such as ethylene-vinyl acetate copolymers, polystyrene, styrene-butadiene copolymers, cellulose esters, cellulose ethers, acrylic resins, etc. can also be used.

In addition, various animal oils, vegetable oils, mineral oils, dioctyl phthalate, tricresyl phosphate, dibutyl phthalate, butyl benzyl phthalate, polybutene, tempel low polymers, modified terpene polymers, etc. are suitably used as the softening material. .

In addition, as the opaque whitening agent in the present invention,
For example, titanium oxide, zinc oxide, with a particle size of 0.1 to 5μ,
Examples include zinc sulfate.

Further, in order to uniformly disperse the opaque whitening agent, it is preferable to use a pigment dispersant, and examples of the pigment dispersant include dipolyoxyethylene alkyl ether phosphoric acid, tripolyoxyethylene alkyl ether phosphoric acid, polyoxyethylene stearyl Examples include nonionic surfactants such as amine, polyoxyethylene oleylamine, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, and polyoxyethylene stearyl ether.

The two-layer type white ink layer 2 shown in FIG. 1 is obtained by coating a heat-sensitive transfer material alone on the upper layer of the opaque white agent layer 3. At that time, the opaque whitening agent layer 3
is formed by applying and drying an opaque whitening agent in the form of an emulsion ink or solvent ink, which is a mixture of a binder material, a softener, and a pigment dispersant. Examples of the binder material for fixing the opaque whitening agent include thermoplastic resins such as polyvinyl butyral, polyvinyl acetate, styrene-butadiene copolymer, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, and polystyrene. The binder material is used at a ratio of 0.5 to 20 parts per 100 parts of the opaque whitening agent to give the opaque whitening agent layer 3 adhesion to the thermal transfer layer 4 and appropriate properties during melt transfer of the thermal transfer layer 4. This is preferable in terms of providing vulnerability. Thermal transfer layer 4
and the opaque whitening agent layer 3 have a thickness of 1 to 1, respectively.
It can be suitably used in the range of 5μ and 4 to 30μ.

In the white ink layer 2 of the present invention, since the thermal transfer material and the opaque white agent are formed as separate layers, the thermal transfer material has extremely good thermal meltability and can be easily melted and transferred. At the same time, the opaque whitening agent can be contained in a large amount per unit area, so that the opacity and masking properties of the opaque whitening agent are not impaired, and furthermore, after being transferred onto the false image 5, the transferred opaqueness is There is no risk of the whitening agent layer peeling off.

Note that instead of the two-layer white ink layer 2 in which the opaque white agent layer 3 and the heat-sensitive transfer layer 4 are sequentially laminated on the base material 1, the heat-sensitive transfer layer 4 and the opaque heat-sensitive transfer layer 4 are laminated on the base material 1. It is also possible to employ a white ink layer formed by sequentially laminating whitening agent layers 3.

The base material 1 used in the present invention has appropriate heat resistance strength and thermal conductivity of 3.0×10 ^-4 cal/sec・
Papers such as plain paper, laminated paper, and glassine paper, and resin films such as polyethylene, polystyrene, polypropylene, and polyester are preferably used as long as they have excellent thermal conductivity above .degree. C. Further, the thickness of the base material 1 is preferably 60 μm or less in order to obtain good thermal conductivity.

Next, the thermal transfer type correction member of the present invention will be explained with reference to Examples.

Example 1 An opaque whitening agent layer composition having the following composition was coated on glassine paper having a thickness of 15μ by solvent coating to obtain an opaque whitening agent having a thickness of 20μ.

(Components) (Parts) Titanium oxide 30 Silica powder 10 Polyoxyethylene lauryl ether 0.2 Vinyl chloride-vinyl acetate copolymer 5 Dioctyl phthalate 5 Methyl ethyl ketone 100 Next, low molecular weight polyethylene 10 as a thermal transfer layer
1 part and 3 parts of ethylene-vinyl acetate copolymer are dissolved in 50 parts of toluene, and further 5 parts of dioctyl phthalate and 3 parts of copper powder are uniformly mixed and coated on the opaque whitening agent layer, dried and thickened. A heat-sensitive transfer layer with a thickness of 3 μm was formed.

Then, apply the obtained correction material to a thermal printer (Canon program calculator 5X-100 type),
Printed image (erroneous image) formed on plain paper in advance
When 6 millijoules of energy was applied to the printed image by a heating head corresponding to the printed image and the printed image was melted and transferred, the printed image was completely masked by the white ink layer, and the white ink layer was melted and transferred. The printed image that was reprinted on the area that had been printed was also clear.

Table 1 shows the printing densities before and after correction and the reprinting densities measured with a Macbeth densitometer.

Table 1 (Macbeth concentration) Plain paper (white) density 0.15 Print density before correction 1.61 Print density after correction 0.40 Reprint density 1.60

[Brief explanation of drawings]

The first is a schematic sectional view showing an embodiment of the thermal transfer type correction member of the present invention, and the second is a schematic explanatory view showing a correction operation when the correction member shown in FIG. 1 is used. (Main symbols in the drawings), 1: base material, 2: white ink layer, 3: opaque white agent layer, 4: thermal transfer layer.

Claims (1)

[Scope of Claims] 1. A thermal transfer type correction member comprising a heat-sensitive melt transferable opaque white ink layer provided on a base material,
The opaque white ink layer is formed by laminating an opaque white agent layer in which a white pigment that makes the opaque white ink layer opaque is mixed and dispersed in a thermoplastic resin binder material and a heat-sensitive transfer layer made of a wax-like substance. A thermal transfer type correction member consisting of. 2. The thermal transfer type correction member according to claim 1, wherein the thermal transfer layer contains a thermally conductive substance. 3. The thermal transfer type correction member according to claim 1 or 2, wherein the opaque whitening agent layer and the heat-sensitive transfer layer are laminated in this order on a base material.