JPH03173691A - Thermosensitive transfer material - Google Patents

Abstract

PURPOSE:To easily obtain a multiple bar code/hidden bar code/pseudo bar code recorded matter by providing ink layers formed by separately applying two or more kinds of inks having absorption in different detection wavelengths. CONSTITUTION:A thermosensitive transfer material wherein one or more kind of a thermosensitive transfer ink layer containing a compound selectively absorbing light having a wavelength of 400-700nm and one or more kind of a thermosensitive transfer ink layer containing a compound selectively absorbing light having a wavelength of 700-1500nm are provided on a base material is used. Further, two kinds of the ink layers are prof. applied separately so as not to overlap each other. Respective inks must be almost transparent in other detection wavelength. As these compounds, a generally used dye selectively absorbing light having a wavelength of 400-700nm and a near infrared absorber selectively absorbing light having a wavelength of 700-1500nm, for example, a phthalocyanine, naphthalocyanine or cyanine dye compound are designated. By this constitution, it is unnecessary to replace a thermal transfer agent one by one and a multiple/hidden/pseudo bar code recorded matter can be easily obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a thermal transfer material provided with two or more types of thermal transfer inks that selectively absorb light of specific wavelengths. More specifically, the present invention relates to a thermal transfer material capable of recording multiple barcodes, hidden barcodes, pseudo barcodes, etc. on labels, tickets, cards, documents, etc.

(Conventional technology) Conventionally, barcodes have been attached to products in order to streamline product management in factory automation, POS, logistics, and service departments, but the amount of information that can be recorded with one set of barcodes is limited. Therefore, a recording method with a larger amount of information is desired.

In addition, barcode reading is difficult because recorded materials are digital information, so if the existence of a barcode is visible to the naked eye, it can be easily copied, and it is easy to forge or digitize it, making it difficult to protect the confidentiality of securities, certificates, etc. It had the disadvantage that it could not be used for applications requiring

Regarding the former, information multiplexing, specifically, Japanese Patent Application Laid-open No. 6
No. 3-293081 proposes a recording medium having multiple barcodes, and printing is performed using letterpress, intaglio, lithography, screen printing, and other types of typesetting, and selective printing mechanisms such as typewriters and barcode printers. However, with these methods, it is simply not possible to record multiple barcodes easily.

In addition, regarding the latter counterfeiting/numerical prevention, specifically,
For the purpose of hiding information, Japanese Patent Laid-Open No. 58-134782 discloses a method of arranging or layering inks of the same color with different near-infrared transmittances or reflectances; No. 58-171995 proposes a method of providing pseudo bars of the same color tone having different spectral characteristics in the infrared region. However, even with these methods, if you specifically try to record hidden/pseudo barcodes, it is impossible to do so easily.

(Problems to be Solved by the Invention) In view of the above problems, the present invention provides a thermal transfer material that allows multiple barcodes, hidden barcodes, and pseudo barcode recordings to be easily obtained by a thermal transfer recording method. It is.

[Structure of the invention]

(Means for Solving the Problem) That is, the present invention provides one or more thermal transfer ink layers containing a compound that selectively absorbs light with a wavelength of 400 nm to 700 nm, and a thermal transfer ink layer with a wavelength of 700 nm to 1500 nm.
The present invention relates to a heat-sensitive transfer material, characterized in that one or more heat-sensitive transfer ink layers containing a compound that selectively absorbs light with a wavelength of , are provided on a base material. Furthermore, the present invention relates to a thermal transfer material formed by coating the two types of ink layers separately so as not to overlap each other.

Since the above-mentioned thermal transfer material can be easily recorded with a normal thermal transfer printer, when the thermal transfer material of the present invention is used, multiple printing can be performed using two or more types of thermal transfer inks each containing a compound that selectively absorbs light of a different wavelength. It can be used for a variety of purposes including:

(2) Overlapping patterns and characters such as barcodes are recorded in the same position using inks with different optical properties.

2. Record patterns and characters such as barcodes in different positions using inks with different optical properties.

3. Record barcodes, characters, etc. in the same position, and print on the entire surface like an overcoat using ink with different optical properties.

4. After solid printing is performed on the entire surface, characters and patterns such as a bar code are recorded thereon using ink with different optical properties.

As a result of the above operations being easily performed, it is possible to obtain multiple barcode records that can record a large amount of information, records that contain invisible information that can be easily identified by a barcode reader, etc.

In order to specifically obtain a hidden barcode record or a pseudo barcode record, the following steps are required to record the information code:
The thermal transfer material of the present invention is used, which is coated with an ink that absorbs at a specific detection wavelength and an ink that does not substantially absorb at the specific detection wavelength.

The ink for recording the information code is 700 nm to 15
It contains a compound that selectively absorbs light at a detection wavelength of 0.00, and can further contain a dye that has substantially no absorption at the specific detection wavelength, if necessary. The color of the ink that does not absorb at the specific detection wavelength is not limited, and two or more colors of ink can be applied separately.

Therefore, it is possible to print in full color on the information code using process colors of yellow, red, and indigo, and the resulting recorded material does not show the presence of a barcode when visually inspected, making it indistinguishable from normal full-color printed material. No difference observed. in this case,
As the information code recording ink, it is preferable to use a colorless or light-colored ink. Furthermore, by using the thermal transfer material of the present invention in which the ink for recording the information code and the ink that does not substantially absorb at the detection wavelength have the same color tone, an overcoat is provided on the information code with the ink of the same color tone. Alternatively, a pseudo bar of the same color tone can be provided in the white part of the information code, making it difficult to visually identify genuine information and to forge it by copying in any recorded matter.

Further, in order to obtain a multi-barcode recording material, the heat-sensitive transfer material of the present invention is used, which is coated with two or more kinds of inks having absorption at different detection wavelengths. However, each ink must be almost transparent at other detection wavelengths, and materials such as carbon black that have absorption at all wavelengths cannot be used. Such thermal transfer materials include, for example, purple ink having absorption at 633 nm, 780 nm
There are products that are coated with at least two types of inks: an ink that absorbs at 880 nm and an ink that absorbs at 880 nm. When different barcodes are printed on the same location using the above three types of ink, each barcode can be read by a barcode reader with a reading wavelength of 633.780.880 nm without interfering with each other. If necessary, a dye that does not absorb at the detection wavelength used can be used in combination with the above three types of ink.

Examples include yellow, red, and other pigments that have absorption in the range of 400 to 600 nm and have no substantial effect at the detection wavelength.

The recorded matter can be detected by ordinary visible light and near-infrared absorption detection devices, and is effective for checking product loft numbers and product numbers given to various products for product management. Further, arbitrarily set individual information can be easily added, and the added figures, patterns, symbols, etc. can be made difficult to visually distinguish.

The compound that absorbs light of a specific wavelength in the present invention is:
Commonly used dyes that selectively absorb light with wavelengths between 400 nm and 700 nm, and between 700 nm and 15 nm.
Near-infrared absorbers that selectively absorb light with a wavelength of 00 nmk, such as phthalocyanine-based, naphthalocyanine-based, dithiol metal complex salt-based, anthraquinone-based, mercaptonaphthol metal complex-based salts, nano-1 to quinone-based compounds, cyanine dye-based compounds, etc. It is.

The thermal transfer material of the present invention is one in which two or more types of heat-melting inks are sequentially applied to a base material along the length or width direction of the base material by hot melt coating or solvent coating. Conventionally known materials can be used as the material for the thermal transfer material. for example,
Base films used as substrates include polyester and polyamide films, which have excellent heat resistance and mechanical strength.Vehicles used for heat-melt inks include vegetable-based and
These include natural waxes such as animal-based, mineral-based, and petroleum-based waxes, synthetic waxes, fatty acids, and thermoplastic resins with a softening point of 200°C or less.

In addition, if necessary, additives such as softeners such as oil, ultraviolet absorbers, radical polymerization inhibitors, peroxide decomposers, extender pigments, etc. may be used in the above-mentioned hot-melt ink to increase light resistance. I can do it.

In order to provide multiple, hidden, or pseudo barcodes using the thermal transfer material of the present invention, for example, the thermal head is
First, a barcode is printed using an ink coated part that selectively absorbs light with a wavelength of 700r+n+ to 1500nm, and then the recording paper is returned and the barcode is printed with a printer that selectively absorbs light with a wavelength of 700n+n+ to 1500nm.
A method of providing different barcodes, coating layers, or pseudo bars in the ink coating area that selectively absorbs light with a wavelength of m, and recording using a printer with two or more thermal heads installed along the traveling direction of the recording paper One method is to apply a barcode first, followed by different barcodes, coating layers, or pseudobars as the paper advances.

In either method, there is no need to replace the thermal transfer material each time, and multiple, hidden, and pseudo barcode recordings can be easily obtained.

(Example) Hereinafter, the present invention will be explained in detail with reference to Examples.

All parts in the examples represent "parts by weight."

Example 1 Ink A was obtained by sufficiently dispersing a coating liquid having the following composition at room temperature using an attritor.

[Ink A]

Alicyclic saturated hydrocarbon resin 10 parts (Arayo Kagaku Kogyo ■ Alcon P-100> Carnauba wax 10 parts Near-infrared absorber
0.2 parts (PR made by ICI Japan)
O-JET IR5C101756) Toluene
65 parts Isopropyl alcohol 14.8 parts Furthermore, in a 5 liter sand mill filled with 60% by volume glass beads with an average particle size of 0.5 mm, the following premixed composition was mixed at a speed of 2 liters/min with a gear pump. Preparation, sand mill 1
Ink B was obtained by rotating at a speed of 0 ml and 1 second and repeating kneading 10 times.

[Ink B]

Alicyclic saturated hydrocarbon resin 7.5 parts (Alcon P-100 manufactured by Arayo Kagaku Kogyo ■) Carnauba wax 7.5 parts C, 1, Pigmen
t Blue 1 5 parts (manufactured by Toyo Ink Seisakusho)
Ultra Blue B) Toluene
65 parts isopropyl alcohol 15
6 parts of the obtained ink A-B was printed using a gravure printing machine.
A polyethylene terephthalate film having a dry coating thickness of 1.6 μm was printed in a fixed size to obtain a heat-sensitive transfer material coated in two colors.

Barcode printer (manufactured by Tokyo Electric B-30-3l)
), a barcode a was recorded using the ink A coated area of the thermal transfer material, and a barcode b different from a was recorded at the same location using the ink B coated area. For barcode a, use a barcode reader (■Token TBR-6000) that uses a 780nm laser as a light source.
So, for barcode b, the light source is 632.8 parts m.
Barcode verification machine using l1e-Ne laser (
SYMBOL TECIINOLOGIES, Inc.
, manufactured by LASERCHECK LC2811), it was possible to read each code according to the code.

Example 2 Ink C was obtained by sufficiently dispersing a coating liquid having the following composition at room temperature using an attritor.

[Ink C]

Alicyclic saturated hydrocarbon resin 10 parts (Alcon P-100 manufactured by Arayo Kagaku Kogyo ■) Carnauba wax 10 parts Near-infrared absorber
0.2 parts (rpc manufactured by Nippon Kayaku ■)
-o23) 65 parts of toluene 14.8 parts of isopropyl alcohol The obtained ink C1 and the same ink A-B as in Example 1 were dried and coated with ink A-C on a 6 μm polyethylene terephthalate film using a gravure printing machine. 1.6 μm for membrane
A heat-sensitive transfer material coated in three colors was obtained by separately printing the ink B into a certain size so that the thickness was 4.0 μm.

Using a barcode printer, record a barcode a using the ink A coated part of the thermal transfer material, record a barcode C different from a using the ink C coated part in the same place, and then record the ink B coat. Solid printing was performed using the section to cover the entire barcode.

Although the presence of a barcode is not visually recognized in the recorded material obtained, a barcode reader with a reading wavelength of 780nm can detect the information corresponding to barcode a at a reading wavelength of 880nm.
Information corresponding to the barcode C was read using a nm barcode reader (HtlC3-7100 manufactured by Yokogawa Huyulet Paracard ■).

Example 3 Coating liquids having the following compositions were thoroughly kneaded using three rolls heated to 90 to 120°C to obtain inks D and E.

[Ink D]

1 C, 1, Pigment Red 53 20 parts (manufactured by Toyo Ink Manufacturing Co., Ltd. Rake Left C Conc.
) Ethylene-vinyl acetate copolymer 5 parts (Mitsui Polychemical ■ Evaflex 577-2) Carnauba wax 16 parts Paraffin wax 59 parts (Hiki Seiro ■
IINF-9) [Ink E] C, 1, Pjgment Red 53 20 parts (Lakere FC Conc, manufactured by Toyo Ink Manufacturing ■) Near-infrared absorber 1 part (PRO-JET IR5C101756, manufactured by CI Japan ■) Edylene-vinyl acetate copolymer Combined 5 parts (Evaflex 577-2 manufactured by Mitsui Polychemicals) Carnauba wax 16 parts Paraffin wax 58 parts (Japanese Seiwax H
NP-9) The obtained ink D-E was coated on a 6 μm polyethylene terephthalate film using a hot melt coating machine.3.
A heat-sensitive transfer material 2 was obtained which was coated with printing portions &-1 and 2 colors at a constant size so as to have a thickness of 0 μm.

Using a barcode printer, a barcode e was recorded using the ink E coated portion of the thermal transfer material, and a pseudo bar was further recorded on the white portion of the barcode e using the ink D coated portion. When this recorded material was read with a barcode reader with a reading wavelength of 780 nm, information corresponding to the barcode e was read. However, a copy of this recorded material,
Even when reading with a barcode reader with a reading wavelength of 780 nm, the information corresponding to barcode e could not be read.

[Operation and effects of the invention]

As described above, by using the thermal transfer material coated in two or more colors of the present invention, there is no need to replace the thermal transfer material each time or use two or more printers to record, and it is possible to easily create multiple barcodes. - Hidden barcodes and pseudo barcode records can be obtained.

Claims (1)

[Claims] 1. One or more types of thermal transfer ink layer containing a compound that selectively absorbs light with a wavelength of 400 nm to 700 nm, and a layer that selectively absorbs light with a wavelength of 700 nm to 1500 nm. 1. A heat-sensitive transfer material, characterized in that a base material is provided with one or more heat-sensitive transfer ink layers containing a compound. 2. One or more types of thermal transfer ink layer containing a compound that selectively absorbs light with a wavelength of 400 nm to 700 nm, and one or more types of thermal transfer ink layer containing a compound that selectively absorbs light with a wavelength of 700 nm to 1500 nm. 2. The thermal transfer material according to claim 1, wherein two or more types of thermal transfer ink layers are separately coated on the base material so as not to overlap.