JPH044158B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a thermal transfer type correction member.

Recording using the thermal transfer method has become extremely popular because it is excellent in terms of reliability, storage stability, clarity, etc.

Accordingly, it is desired to establish a method for correcting printed characters once recorded.

In general so-called impact printers, typewriters, etc., a widely used method of erasing is to overprint a white correction layer made of a white pigment mainly made of titanium oxide, resin, wax, etc. on the print to be erased. It is.

However, in order to completely cover typographical errors, even if titanium oxide, which is known as the white pigment with the highest hiding power, is used, the white correction layer needs to be approximately 20 microns or more thick.

In thermal transfer recording, it is easy to use a similar white correction layer of the thermal transfer type.

However, in thermal transfer printers and typewriters, unlike impact printers, the print head generally remains in contact with the thermal transfer ribbon and moves in a sliding manner.

Therefore, applying a thick white correction layer such as that used in impact printing will prevent the printing head from moving and will also cause uneven contact between the thermal transfer ribbon and the paper surface, making it difficult to reprint the correct characters over the correction area. In this case, there is a drawback that good printing cannot be performed. Furthermore, in the thermal transfer method, the transfer layer is melted and transferred by the heat from the head, so if the layer is too thick, heat conduction will be insufficient, resulting in a fatal problem of defective transfer.

On the other hand, as a result of intensive research, the present inventor has developed a method that is much thinner than before, using the method described below.
Moreover, it was discovered that a white correction layer with sufficient concealment power could be obtained.

This white correction layer is formed on paper or film and can be used in ordinary thermal transfer printers, typewriters, etc.

That is, titanium oxide is currently known as the white pigment with the highest hiding power, but as mentioned above, it is still necessary to form a thick layer in order to obtain sufficient hiding power.

On the other hand, aluminum powder, especially leafing type aluminum powder, has much higher hiding power and has sufficient hiding power even in a thin layer.

However, since aluminum powder itself exhibits a so-called "silver white" color, it cannot be used as it is as a correction white layer.

On the other hand, if you adopt the following configuration, the concealment power is high,
A white and thin white correction layer can be formed.

That is, a base material made of film or paper is coated with a base material mainly made of resin and/or wax and titanium oxide.
a white layer thinner than 10μ, preferably thinner than 5μ;
A hidden layer with a thickness of less than 5μ with high light reflectance, e.g.
By sequentially providing a concealing layer made mainly of resin and/or wax and leafing-type aluminum powder, typographical errors are completely covered by the aluminum layer, and the white layer above it is made white. Compared to directly covering the typo (black), the aluminum layer has a high reflectance and is silvery white, so
The white layer is much thinner and better. The aluminum layer also has a very high hiding power of leafing type aluminum powder, so
A thin layer is sufficient.

Therefore, compared to the case where the white layer containing titanium oxide is used alone, although the structure of the present invention has a two-layer structure, it is possible to obtain the same hiding power and whiteness with a thinner layer, and the movement of the printing head is There is no problem in preventing this, and the reprintability on the correction layer is also improved.

According to this configuration, in the case of only a titanium oxide layer,
While a thickness of 20μ or more is required, a white correction layer with the same or higher hiding power can be obtained with a thickness of 10μ or less, and aluminum powder with good thermal conductivity is used. Combined with this, printing sensitivity is good and clear transfer can be obtained. Furthermore, the same effect can be obtained by providing an aluminum vapor-deposited layer on the white layer of titanium oxide instead of the layer containing leafing-type aluminum powder, and further providing an adhesive layer made of resin and/or wax. In the following examples, "parts" are parts by weight.

Example 1 Compound Oxidized wax 20 parts Parafine wax 3 parts Ethylene-vinyl acetate copolymer resin 5 parts Titanium oxide 50 parts Toluene 200 parts Sorbitan dispersant 0.02 parts Blend Aluminum powder No. 3L12 manufactured by Nippon Metal Powder Co., Ltd. 10 parts Ethylene-vinyl acetate copolymer resin 4 parts Ester gum 4 parts Toluene 80 parts The ink was prepared using a ball mill on a PET film with a thickness of 6μ, and the dry thickness was
It was coated to a thickness of 7μ and dried, and then an ink having the same formulation was coated on top of it to a dry thickness of 2μ and dried to obtain a white correction film. (sample
No.1) As a comparative example, PET with the same composition and thickness of 6μ
It was coated on a film to a dry thickness of 10μ and dried to obtain a white correction film (Sample No. 2).

Similarly, the formulation was applied and dried on a 6μ thick PET film to a dry thickness of 20μ to obtain a white correction film. (Sample No. 3) The above samples Nos. 1 to 3 were overprinted on top of the black printed material using a thermal transfer terminal printer manufactured by Canon Inc., CW-4250, and then a re-black printing test was performed on top of that. I did it.

As a result, sample No. 1 had sufficient hiding power, completely covered black printing (misprints), had good transfer sensitivity, and even when black printing was performed again from above, good printing was obtained. It was done.

On the other hand, sample No. 2 had no problems with transfer sensitivity and re-black printing, but the hiding power was insufficient and it was not possible to completely cover black printing (misprints). It was difficult to read because it was a double image with the printing.

In addition, sample No. 3 had poor transfer sensitivity, resulting in partial transfer failure and was unable to cover the entire black print (misprint). However, the area that could be transferred had sufficient hiding power and completely erased the black color.

However, when we performed a re-black printing test on top of that, the transfer of the white correction layer was uneven and thick, so
Good printing could not be obtained.

Example 2 The ink with the formulation shown in Example 1 was applied to a 6μ thick plate.
Coat on PET film to a dry thickness of 7μ.
After drying, 0.1 μ thick aluminum vapor deposition was applied on top of it.
The ink was then dried to form a white correction film.

Using this film, we conducted the same tests as in Example 1 using a thermal printer CW-4250 manufactured by Canon Inc., and found that the transfer sensitivity, hiding power, and reprintability were good, and that it could be used without any problems. confirmed.

combination ester gum 10 parts Ethylene vinyl acetate copolymer resin 10 parts Toluene 80 parts

Claims (1)

[Scope of Claims] 1. 10μ mainly made of resin and/or wax and titanium oxide on a base material made of paper or film.
A thermal transfer type correction member characterized by sequentially providing the following white layer and a hidden layer having a thickness of 5μ or less with high light reflectance. 2 In claim 1, the hidden pay layer is
A heat-sensitive transfer type correction member mainly consisting of resin and/or wax and leafing type aluminum powder. 3 In claim 1, the hidden pay layer is
A heat-sensitive transfer type correction member characterized in that a vapor-deposited aluminum layer and an adhesive layer mainly made of resin and/or wax are sequentially formed. 4 In claim 1, the white layer is
A thermal transfer type correction material that is thinner than 5μ.