JPH0316793A - Thermal recording copy sheet - Google Patents

Abstract

PURPOSE:To effectively record and to make an image receiving layer clear by depositing aluminum on one side surface of a base film for upper sheets, depositing aluminum on one side surface of a base film and providing the image receiving layer for middle sheets. CONSTITUTION:An upper sheet 6 is composed by providing an aluminum deposited layer 2a on a base film 1a, further providing a heat sensitive coloring layer 3 thereon, and providing a heat fusible ink layer 4a on the opposite side surface. An intermediate sheet 7 is composed of a sheet having an image receiving layer 5 on a deposited layer 2b of a base film in which aluminum is deposited on one side surface and a heat fusible ink layer 4b on the opposite side surface. Thus, the aluminum deposited layers are provided on the base films of the upper and middle sheets to prevent the ink layer from offsetting, thereby improving whiteness of the coloring layer and the receiving layer, improving clearness of recording. The image receiving layer is provided on the base film of the intermediate sheet to improve the transfer properties of the ink layers of the upper and intermediate sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a thermal recording copy sheet that can simultaneously make three copies using a thermal recording device such as a thermal printer.

(Prior Art) Recently, no-day terminals equipped with small thermal printers have been put into practical use at financial institutions and the like.

Handy terminals are portable terminals that connect data to memory at the location where the data is generated, and then connect that data to a host computer, which greatly simplifies the manual work required for traditional handwritten slips. It is something that will be done.

Since it is necessary to send a hard copy of a receipt or the like to the other party as a slip, as well as a copy, this type of handy terminal uses a thermal recording copy sheet that can make two copies.

The mechanism of a thermal recording copying sheet that can make two copies is that a heat-sensitive coloring layer is provided on the base material, and a heat-melt ink layer is provided on the back side of the heat-sensitive coloring layer. When the required area is heated with a thermal head, the heat-sensitive layer on the front side develops color and records are obtained, and at the same time, the heat-melting ink on the back side is transferred to the image-receiving paper.

(Problems to be Solved by the Invention) There are only two thermal recording copying sheets that can make two copies, the Kamikawa sheet and the Lower sheet, but three sheets may be required for a slip.

Pressure-sensitive carbonless paper is used as slips, and there are usually three sheets: top paper, middle paper, and bottom paper. By the way, it is impractical to install a pressure-sensitive type printer in a handy terminal because it requires too much power, so there is a desire for a thermal recording copy sheet that can be used in a thermal type printer and can make three copies.

The prior art of a thermal recording copying sheet capable of making three copies can be found in Japanese Patent Laid-Open No. 52-35646.

In the example of JP-A-52-35646, there is an upper sheet in which a heat-sensitive coloring layer is formed on the upper surface of the base sheet and a heat-melting ink layer is formed on the lower surface, and a heat-melting ink layer is formed on the lower surface of the base sheet. There is a thermal recording copying sheet constructed by overlapping three sheets: an intermediate sheet on which a layer is formed and a bottom sheet on which nothing is coated. Due to the heating of the thermal head, the thermosensitive coloring layer develops color on the soil sheet and records are performed, the heat-melting ink layer of the soil sheet is transferred and recorded on the width sheet, and the medium sheet is colored on the bottom sheet. The heat-melting ink layer is transferred and recorded, and a total of three sheets of paper are simultaneously recorded.

If the base sheet of the top sheet and the base sheet of the middle sheet of such a thermal recording copy sheet capable of making three copies are made of paper, printing with a commercially available handy terminal will result in the following:
The recording on the middle sheet may be blurred, and the recording on the lower sheet may not be recorded.

This is generally 20μ if the base sheet is paper.
Because it is larger and thicker, the heat from the thermal head is more easily transmitted.
This is because the heat-melting ink layer of the soil-use sheet is difficult to transfer, and the heat-melting ink layer of the intermediate-use sheet is not transferred.

In order to improve this, it is necessary to make the Heath sheet into a film that can be made smaller than 20μ. However, when the base sheet is made of base film, the black color of the heat-melting ink layer on the back side of the recordings on the upper sheet and the middle sheet is visible, so the whiteness of the upper sheet is low and the recording is unclear. Also, since the recording surface of the intermediate sheet was black, the recording was not clear at all.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thermal recording copy sheet capable of making three copies for a commercially available handy terminal.

(Means for Solving the Problems) In the present invention, the upper sheet is a sheet having a heat-sensitive layer on the vapor-deposited surface of a base film having aluminum vapor-deposited on one side, and a heat-fusible ink layer on the opposite surface. The middle sheet is a sheet that has an image-receiving layer on a vapor-deposited layer of a base film with aluminum vapor-deposited on one side, and a heat-melt ink layer on the other side. Plain paper is used as the bottom paper, and plain paper is used as the bottom paper. The above object was achieved by superimposing the fusible ink layer of the medium-sized sheet and the image-receiving layer of the medium-sized sheet, and by superimposing the heat-meltable ink layer of the medium-sized sheet and plain paper to produce a thermal recording copying sheet.

That is, in the top sheet, aluminum is vapor-deposited on one side of the base film to prevent the heat-melting ink layer from showing through and to make the recording of the heat-sensitive coloring layer clear. For medium-use sheets, aluminum is vapor-deposited on one side of the base film to prevent bleed-through of the hot-melt ink layer, and by providing an image-receiving layer, the whiteness of the recording surface of the medium-use sheet is improved and recording It is made clear. If there is no image-receiving layer, the recording surface of the intermediate sheet will have a metallic luster due to the aluminum vapor deposited layer, and the recording will not be clear. The image-receiving layer also has the function of making it easier to transfer the thermal transfer ink layer of the doyo sheet.

The present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration or explanatory diagram of the present invention.

6 is the upper sheet, 7 is the middle sheet, and 8 is the lower sheet. The soil sheet 6 is constructed by providing an aluminum vapor deposition layer 2a on a base film la, further providing a heat-sensitive coloring layer 3 thereon, and providing a heat-melting ink layer 4a on the opposite side.

The thickness of the base film 1a is preferably 6-20μ, more preferably 9-16μ. When the thickness is greater than 20 μm, it becomes difficult to transfer the heat-melting ink layer 4a to the intermediate sheet.

Moreover, if the thickness is less than 6 μm, the physical strength becomes weak, which is not preferable. The material for the base film 1a is selected from those having excellent heat resistance and physical strength. Resin films such as polyimide, polycarbonate, Teflon, and polyester are preferably used.

The aluminum vapor deposited layer 2a is provided to prevent the transfer of the heat-melting ink layer 4a, and its thickness is 300 mm.
~IOOOA is preferred.

The heat-sensitive color forming layer 3 can be one generally used for heat-sensitive paper, and will be explained in more detail as follows.

(A) Dye precursor 3-diethylamino-6-methyl-7-anilinofluorane, 3-piperidino-6-methyl-7-anilinofluorane, 3-pyrrolidino-6-methyl-7-anilinofluorane , 3-(N-ethyl-4'-toluidino)-6
-Methyl-7-anilinofluorane, 3-diethylamino-7-(3'-trifluoromethylanilino)fluoran, 3-diethylamino-7-(2'-chloroanilino)fluorane, 3-methylcyclohexylamino-6- Methyl-7-anilinofluorane, etc.

(B) Color developer phenol, para-1e+l-butylphenol, paraphenylphenol, α-naphthol, β-naphthol, 4. 4'-isopropylidenediphenol,
4.4'-sec-butylidene diphenol, 4.
4'-cyclohexylidene diphenol, phenyl-4-hydroxybenzoate, novolac type phenolic resin, salicylic acid, 8-phenylsalicylic acid, 5
-methylsalicylic acid, 3,5-jerl-butylsalicylic acid, etc.

(C) Sensitizers stearamide, palmitamide, oleic acid amide, lauric acid amide, ethylene bis stearamide, methylene bis stearamide, methylol stearamide, etc.

(D) Adhesives Polyvinyl alcohol, starch, hydroxypropylene cellulose, casein, styrene-putadiene copolymer emulsion, acrylic emulsion, sodium salt or ammonium salt of styrene-maleic anhydride copolymer, etc.

(E) White pigments titanium dioxide, calcium carbonate, kaolin, calcined kaolin, aluminum hydroxide, etc.

A thermosensitive coloring layer 3 is obtained by coating (A), (B), (C), (D), and (E) as an aqueous dispersion using a coater, and smoothing the coated surface using a supercalender.

The thickness of the thermosensitive coloring layer 3 is preferably 1 to 5 microns, more preferably 2 to 3 microns. When the thickness increases by 5 μm, it becomes difficult to transfer the heat-melting ink layers 4a and 4b.

When the thickness is less than 1 μm, clear recording cannot be obtained from the thermosensitive coloring layer 3.

As the heat-melting ink layer 4a, wax-type carbon ink having a melting point of 50 to 70°C is used.

For thermal transferability, it is better that the melting point is as low as 50 to 60°C.

The composition of the hot-melt ink is, for example, as follows.

Composition example of hot melt ink Carbon black 12% paraffin wax 50% carnauba wax
23% ethylene vinyl acetate copolymer
5% petroleum resin 5
% machine oil 5% The thickness of the heat-melting ink layer 4a is preferably 2 to 4 μm, and 2.5 to 3 μm.
．． 5μ is more preferable. When it is less than 2μ, the print density on the medium sheet becomes low and the print becomes unclear. When it is larger than 4μ, thermal transfer of the heat-melting ink layers 4a and 4b becomes poor.

The base film 1b of the middle sheet can be exactly the same as the base film la of the upper sheet. The aluminum vapor-deposited layer 2b of the middle sheet can be exactly the same as the aluminum vapor-deposited layer 2a of the upper sheet.

The image receiving layer 5 is composed of a white pigment, an adhesive, an auxiliary material, etc., and will be explained in more detail as follows.

Note that although the image-receiving layer is exemplified as white, there is no limitation to the use of dyes and pigments to obtain a colored image-receiving layer that can be distinguished by the balance with the color of the heat-melting ink.

(F) White pigments kaolin, calcium carbonate, waxite clay, titanium dioxide, aluminum hydroxide, satin white, barium sulfate, plastic pigments, etc.

(G) Adhesives Polyvinyl alcohol, starch, hydroxyethyl cellulose, carboxymethyl cellulose, casein, styrene-butadiene copolymer emulsion, methyl methacrylate-butadiene copolymer emulsion, etc.

(H) Auxiliary materials Dispersants such as phosphates and polyacrylates, waterproofing agents such as glyoxal and melamine resins, lubricants such as metal soaps, etc.

The image-receiving layer 5 is obtained by coating (F), (G), and (H) as an aqueous dispersion using a coater, and smoothing the coated surface using a supercalender. The thickness of the image receiving layer 5 is preferably 1 to 5 microns, more preferably 2 to 3 microns. When the thickness is greater than 5 μm, it becomes difficult to transfer the heat-melting ink layer 4b. When the thickness is less than 1 μm, the whiteness of the image-receiving layer 5 is low, which is not preferable.

The heat-melting ink layer 4b of the middle sheet can be exactly the same as the heat-melting ink layer 4a of the top sheet.

The lower sheet 8 can be made of paper or a plastic sheet.

In the case of paper, it is preferable that the surface to which the heat-melting ink layer is transferred has a smoothness of 200 to 500 seconds.

In the case of a plastic sheet, an image-receiving layer similar to that of the intermediate sheet may be provided.

(Function) By providing an aluminum vapor-deposited layer on the base film of the upper sheet to prevent the transfer of the heat-melting ink layer, the whiteness of the heat-sensitive coloring layer is improved and the clarity of the recording of the heat-sensitive coloring layer is improved. It has improved.

Furthermore, by providing an image-receiving layer on the base film of the intermediate sheet, the transferability of the heat-melting ink layers of the upper and lower sheets was improved. An aluminum vapor-deposited layer is provided on the base film of the intermediate sheet to prevent the transfer of the hot-melt ink layer, thereby improving the whiteness of the image-receiving layer and improving the clarity of recording on the image-receiving layer. .

〔Example〕

Next, the thermal recording copy sheet of the present invention will be explained with reference to Examples and Comparative Examples.

Example 1 An aluminum vapor-deposited layer was provided on one side of a polyester film with a thickness of 12μ, and a heat-sensitive coating liquid was further applied thereon using an air knife coater.
The layer was smoothed under a pressure of /ci to obtain a white heat-sensitive coloring layer with a thickness of 2.5 μm and a black color. Next, a black heat-melting ink layer was coated on the opposite side of the heat-sensitive coloring layer using a 2.5μ hot-melt coater to obtain a clay sheet.

An aluminum vapor-deposited layer was provided on one side of a polyester film with a thickness of 12μ, and the coating liquid for the image-receiving layer was applied thereon using an air knife coater.
The layer was smoothed with a pressure of g/cJ to obtain a white image-receiving layer with a thickness of 2.5 μm.

Next, apply a black heat-melting ink layer of 2.5 mm on the opposite side of the image-receiving layer.
It was coated with a μ hot melt coater to obtain a medium-use sheet.

For the bottom sheet, high-quality paper manufactured by Mitsubishi Paper Mills (trade name: TTR-T) was used. The surface to which the heat-melting ink layer was transferred had a standard smoothness of 400 seconds.

The top sheet, middle sheet, and bottom sheet thus obtained were stacked as shown in FIG. 1 to obtain a thermal recording copying sheet of the present invention.

Example 2 An aluminum vapor deposition layer was provided on one side of a polyester film with a thickness of 9μ, and a heat-sensitive coating liquid was further applied thereon using an air knife coater.
The layer was smoothed under a pressure of 3.0 μm to obtain a white heat-sensitive coloring layer with a black color of 3.0 μm.

Next, add 3 black heat-melting ink layers on the opposite side of the heat-sensitive coloring layer.
．． A soil sheet was obtained by coating with a 0μ hot melt coater.

An aluminum vapor-deposited layer was provided on one side of a 9μ thick polyester film, and then the image-receiving layer coating liquid was applied using an air knife coater.
It was smoothed under a pressure of g/aI to obtain a 3.0μ white image-receiving layer. Next, apply 3 layers of black heat-melting ink on the opposite side of the image-receiving layer.
．． A medium-use sheet was obtained by coating with a 0μ hot melt coater.

For the bottom sheet, high-quality paper manufactured by Mitsubishi Paper Mills (trade name: TTR-T) was used. The Bekk smoothness of the surface to which the heat-melting ink layer was transferred was 400 seconds.

The top sheet, middle sheet, and bottom sheet thus obtained were stacked as shown in FIG. 1 to obtain a thermal recording copying sheet of the present invention.

Comparative Example 1 A thermal recording copying sheet other than the present invention was obtained in exactly the same manner as in Example 1, except that the aluminum vapor deposited layers of the top sheet and middle sheet were removed.

Comparative Example 2 A thermal recording copying sheet other than the present invention was obtained in exactly the same manner as in Example 1 except that the image-receiving layer of the intermediate sheet was removed.

Comparative Example 3 A heat-sensitive coating liquid was applied onto paper with a thickness of 25 μm using an air knife coater, and the layer was smoothed with a pressure of IO kg/cJ using a super calendar to obtain a white heat-sensitive coloring layer with a black color of 3.0 μm. .

Next, add two black heat-melting ink layers on the opposite side of the heat-sensitive coloring layer.
．． A top sheet was obtained by coating with a 5μ hot melt coater.

2. Apply a layer of black hot-melt ink on one side of a 25μ thick paper.
A medium-use sheet was obtained by coating with a 5μ hot melt coater.

For the bottom sheet, high-quality paper manufactured by Mitsubishi Paper Mills (trade name: TTR-T) was used. The Bekk smoothness of the surface to which the heat-melting ink layer was transferred was 400 seconds.

The top sheet, middle sheet, and bottom sheet obtained in this way are
Overlap them to correspond to the figure. A thermal recording copying sheet other than the one according to the present invention was obtained.

Regarding the thermal recording copy sheets obtained in Examples 1 to 2 and Comparative Examples 1 to 3, Canon Handy Terminal HT-5 was used.
000P and its performance was evaluated. The results are shown in Table 1.

(Margin below) The evaluation method is as follows.

Faint printing: Canon Handy Terminal HT-
The blurring of characters when printed at 5000P was visually determined.

Contrast of printing: The contrast between the characters printed using Canon Handy Terminal HT-5000P and the non-printing surface was visually determined.

In Example 1, the top sheet had good print quality with good blurring and good print contrast.

The middle paper and the bottom paper were similarly good, and there were no problems at all when used as a thermal recording copy sheet for three-sheet recording.

As with Example 1, Example 2 had no problems at all.

In Comparative Example 1, the non-printing surface was black and the contrast of the printing was poor in the soil sheet and medium sheet, and the sheet was poor as a thermal recording copy sheet for three-sheet recording.

Comparative Example 2 was an intermediate sheet, the non-printing surface was black, the aluminum vapor deposited layer was glossy, the contrast of the printing was poor, and it was unsuitable as a thermal recording copying sheet for three-sheet recording.

In Comparative Example 3, the contrast of the printing on the top sheet and the middle sheet was slightly poor, the printing on the middle sheet was slightly blurred, and the printing on the bottom sheet was poor, and the thermal recording copy for three-sheet recording was poor. The sheet was defective.

(H) Effects of the Invention The thermal recording copying sheet of the present invention has the excellent advantages of being able to make three copies at the same time on a commercially available handy terminal and having good printability. is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural explanatory diagram of a thermal recording copy sheet of the present invention. In the figure, 6 indicates the upper sheet, 7 indicates the middle sheet, and 8 indicates the lower sheet. 1a is the base film of the upper sheet, 2a is the aluminum vapor deposited layer of the upper sheet, 3 is the thermosensitive coloring layer, 4
a indicates the heat-melting ink layer of the top sheet. 1b is the base film of the intermediate sheet, 2b is the aluminum vapor deposited layer of the intermediate sheet, 5 is the image receiving layer, and 4b is the heat-melting ink layer of the intermediate sheet. FIG. 2 is an explanatory view showing the thermal recording copy sheet of the present invention after printing is performed by the thermal head 9. FIG. A is a recording on the upper sheet, where the color is developed by the heat-sensitive coloring layer, B is a recording on the middle sheet, and is a recording area obtained by transferring 4a, and C is a recording on the lower sheet, showing a recording area resulting from transfer 4b. Figure 2 EL

Claims (1)

[Claims] A sheet having a heat-sensitive coloring layer on a vapor-deposited layer of a base film with aluminum vapor-deposited on one side, and a heat-melting ink layer on the opposite side is used as an upper sheet, and a sheet on the vapor-deposited layer of a base film with aluminum vapor-deposited on one side. has an image-receiving layer,
A sheet with a heat-fusible ink layer on the opposite side is used as the middle sheet, plain paper is used as the bottom sheet, the heat-melt ink layer of the top sheet and the image-receiving layer of the middle sheet are overlapped, and the middle sheet is A thermal recording copy sheet made by overlapping a layer of heat-melting ink and plain paper.