JP3391548B2 - How to erase visible records - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a commuter pass, an entrance permit,
The present invention relates to a method for uniformly and quickly erasing a visible record when repeatedly displaying and erasing a visible image on a recording medium that is repeatedly used such as various prepaid cards.

[0002]

2. Description of the Related Art A commuter pass for a transportation facility, an admission permit for an event venue or a building, etc. are used repeatedly every day, but there is no means for checking illegal boarding or entrance due to management. recent years,
The check method using a magnetic card is being adopted in some cases, but since the presence or absence of a check cannot be visually checked, there is a risk of check leakage due to trouble on the device, and both the manager and the user felt inconvenient. In addition, magnetic cards and IC cards are also used in various prepaid cards, but since the recorded contents cannot be directly visually inspected, the paid amount and the remaining amount cannot be easily checked, and there is a problem in terms of guaranteeing the contents to the user. .

Therefore, conventionally, there has been proposed a method of visually recording on a recording medium and erasing it. For example, disperse an organic low molecular weight substance in a synthetic resin matrix,
It has been proposed to use a material (JP-A-55-154198) that changes to a transparent state or an opaque (white turbid) state depending on temperature. This material has the property of becoming transparent when cooled from a specific temperature range T ₁ to room temperature and becoming opaque when cooled to a room temperature from a temperature range T ₂ higher than T _1. You can reversibly print and erase.

[0004]

In the method of recording by reversible change between the transparent state and the opaque state, printing is performed by a thermal head or heating stamp, and erasing is performed by a heating plate or heating roll. Is proposed. However, when the erasing area of the heating plate is large, there is a problem that the contact pressure with the recording medium varies and uneven erasing occurs, which prevents uniform erasing.

Further, as the heating roll, a metal cylindrical body having a heat source such as a halogen lamp inserted in the hollow portion is generally used, but it takes a long time to raise the temperature and the temperature control is complicated, so that the apparatus is not suitable. There was a problem that it became too big.

[0006]

The present invention solves this problem and uses a heating roll for energizing and heating a resistor formed by filling a heat-resistant resin with conductive ceramics and forming a cylindrical shape. In addition, the present invention provides a simple erasing method with temperature control that has a short heating time.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a conceptual diagram of a printing / erasing system for a recording medium of the present invention, and FIG. 2 is a sectional view of an example of a heating roll for erasing in the present invention.

FIG. 1 shows an example in which the recording medium is a card, and a visible recording layer made of a synthetic resin material which causes a reversible change between a transparent state and an opaque state by heating is formed on the surface of the card 1. The recording layer forms the visible recording display window 2. The card 1 is sent to the erasing unit by the transport roll 4. The erasing unit is composed of a heating roll 5 and a pressing roll 6, and the card 1
The entire display window 2 is made transparent.

The transparentizing temperature T ₁ differs depending on the composition of the recording layer, and usually has a specific temperature range, and its temperature width needs to be 5 ° C. or more. Next, the card 1 is sent to the printing unit, and new information is printed on the display window 2 by the thermal head 7. 8 is a platen roll. The heating temperature by the thermal head 7 is a temperature T ₂ (T ₂ > T ₁ ), which is different from the transparentization temperature region, and when heated, the display characters and the display code become cloudy and the background transparent portion. Due to the contrast, the cloudy image is displayed clearly as if it were raised. The printing means may be a heating stamp,
What is essential is that the recording layer can be locally heated to a predetermined temperature.

The method of the present invention is particularly characterized in that as the heating roll 5 of the erasing unit, a resistor formed by filling a heat-resistant resin with conductive ceramics to form a cylindrical shape is used. That is, as shown in FIG. 2, the electrode 1 is formed on the entire inner and outer surfaces of the cylindrical resistor 9 by plating, foil sticking or the like.
Nos. 0 and 11 are provided, and an electric current is caused to flow in the thickness direction of the cylindrical resistor 9 so that the resistor 9 is energized to generate heat . The resistance value of the resistor 9 changes with heat generation, and when the temperature reaches a constant temperature, the resistance value rapidly increases, the temperature rise is stopped, and the temperature is controlled to a constant temperature. In this heating roll 5, a heat resistant resin layer 12 such as a fluororesin or a silicone resin is provided on the outer surface electrode 11,
It is possible to provide effects such as adhesion with the card 1, insulation, and temperature control by changing film thickness. Moreover, the temperature controller 1
3 may be provided and the current value may be controlled based on the temperature detected by the temperature detector (not shown).

The heat-resistant resin constituting the resistor 9 in the present invention includes nylon resin, polyacetal resin, polycarbonate resin, polyetherimide, polyetheretherketone, and the like, and the conductive ceramics are manganese-zinc ferrite, Examples include zinc oxide, titanium oxide, titanium carbide, tin oxide, and barium titanate. The amount of conductive ceramics added is preferably 30 to 60% by volume, based on the total amount with the heat resistant resin.

When the electrodes 11 and 12 are formed by plating, chemical plating is preferable, and in particular, copper plating on which nickel plating is formed is excellent in oxidation resistance and practically excellent.

In the present invention, the visible recording layer made of a synthetic resin material which causes a reversible change between a transparent state and an opaque state by heating is made of a material in which an organic low molecular substance is dispersed in a synthetic resin base material. Are typical, as the synthetic resin base material, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, other vinyl acetate compounds, vinyl chloride-based copolymers, polyvinylidene chloride, vinylidene chloride-based copolymers, Polyester, polyamide, polystyrene, polymethyl (meth) acrylate or a copolymer thereof and the like are preferable.

As the organic low molecular weight substance to be dispersed in the resin, higher fatty acid or its ether, ester, alcohol, ketone, higher aliphatic saturated dicarboxylic acid or the like is used alone or in a mixture. These materials become transparent when heated to 70 to 100 ° C. (T ₁ ), for example, and remain opaque even when cooled to room temperature, but become cloudy when cooled from a temperature exceeding 100 ° C. (T ₂ ) to room temperature ( Since it becomes opaque, images can be formed and erased reversibly depending on temperature conditions.

[0015]

Example As a recording medium, a magnetic layer was coated on the back surface of a transparent polyethylene terephthalate resin film having a thickness of 188 μm, and then an aluminum vapor deposition layer was provided on the surface, and a visible recording layer was coated thereon to a thickness of 10 μm.

As a resin constituting the recording layer, vinyl chloride-vinyl acetate copolymer (Nissin Chemical MRP-TS) 100 parts by weight 12-tricosanone 35 parts by weight 2,12-tetradecanedioic acid 15 parts by weight tetrahydrofuran To 10 μm thick. 2μ on it
An m-thick polyethylene terephthalate resin protective film was applied. Display printing was performed on the surface of the magnetic recording sheet thus obtained, leaving the recording display window 2, to prepare a card. The card 1 obtained here has a recording layer that is repeatedly transparent and opaque (white turbidity) when heated, and is transparent when cooled from 85 ° C. to room temperature and opaque when cooled from 110 ° C. to room temperature. is there.

Next, printing and erasing of the card thus obtained were carried out by a system as shown in FIG. As the resistor 9 of the erasing heating roll 5, a heat-resistant resin (12
Nylon) is mixed uniformly with 50% by volume of manganese-zinc ferrite as conductive ceramics, and the diameter is 16 m.
m, the wall thickness was 1 mm, and the length was 70 mm, which was molded into a cylindrical shape. Copper plating and nickel plating are sequentially applied to the outer surface of the cylindrical resistor 9 to form electrodes 10 and 11, and the central portion is made of fluorine resin with 0.5 mm left at the end portion of 5 mm.
The heat-resistant resin layer 12 was formed by coating with a thickness of mm.

When a current of 100 V is applied to the electrode of the heating roll thus obtained, the temperature of the heating roll rises to 140 ° C. in a short time of about 30 seconds, and when it reaches 140 ° C., self-temperature control works and a constant temperature is reached. Will be maintained. On this heating roll 5, a card having a recording layer on the surface
When the card passes through and contacts at a speed of mm / sec, the card display window 2
All of the markings were uniformly transparent and erased.

As for printing, an applied voltage of 10 V and an applied time of 0.2 m were applied at a thermal head of 8 dots / mm.
If I print it in seconds, a new display appears in the recording window. Such printing / erasing could be repeated up to 500 times.

[0020]

According to the method of the present invention, the recording medium is printed and erased by using the heating roll which heats the resistor formed by filling the heat-resistant resin with the conductive ceramics in a cylindrical shape by heating. The contact with the medium is uniform, there is no unevenness in erasing, the heating roll can be brought up to a predetermined temperature in a short time, and the heating roll itself is more compact than the conventional one with a built-in halogen lamp. The whole can be made compact.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a printing / erasing system for a recording medium according to the present invention.

FIG. 2 is a sectional view of an example of an erasing heating roll according to the present invention.

[Explanation of symbols]

1 Recording medium (card) 2 Visible record display window 5 heating roller 6 Pressing roller 7 Thermal head 9 resistor 10 external electrodes 11 internal electrodes 12 Heat-resistant resin layer

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-270435 (JP, A) JP-A-6-24129 (JP, A) JP-A-5-303301 (JP, A) JP-A-5-301 262012 (JP, A) JP 5-188809 (JP, A) JP 5-47450 (JP, A) JP 56-123581 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41M 5/36 B41J 2/32 H05B 3/00

Claims (2)

(57) [Claims] 1. An organic low molecular weight substance is dispersed in a synthetic resin base material.
A recording medium having a visible recording layer made of a synthetic resin material that causes a reversible change between a transparent state and an opaque state by heating , and heating the recording layer locally for printing. When erasing the print by heating the entire surface with a heating roll, the heating roll is characterized by using a heating roll that electrically heats a cylindrical resistor formed by filling a heat-resistant resin with conductive ceramics. How to erase visible records. 2. The heating roll according to claim 1, wherein an electrode is provided on the outer surface of the cylindrical resistor, and an electric current is caused to flow in the thickness direction of the cylindrical tube to generate heat by energization. Erase method.