KR20220074163A - Ink ribbon having thermal bonding preventing function - Google Patents

Abstract

The present invention relates to an ink ribbon having a thermal adhesion prevention function, and more particularly, to an ink ribbon for supplying ink that is included in a cartridge mounted on a printing apparatus and thermally transferred to printing paper.
In particular, the present invention relates to an ink ribbon having an anti-adhesion function having an anti-adhesion layer to prevent the ink ribbon from being thermally bonded to a receiving layer of a printing paper during thermal transfer by a printing device.

Description

Ink ribbon with thermal adhesion prevention function {INK RIBBON HAVING THERMAL BONDING PREVENTING FUNCTION}

The present invention relates to an ink ribbon having a thermal adhesion prevention function, and more particularly, to an ink ribbon for supplying ink that is included in a cartridge mounted on a printing apparatus and is thermally transferred to printing paper.

In particular, the present invention relates to an ink ribbon having a heat-adhesive preventing function having an anti-adhesion layer to prevent the ink ribbon from being thermally attached to a receiving layer of a printing paper during thermal transfer by a printing device.

Recently, with the spread of various wireless communication terminals equipped with camera functions and computing functions, including smartphones, tablet PCs, or notepads, users are taking pictures or receiving application services using wireless communication terminals.

For this reason, a thermal transfer printing apparatus that interworks with a wireless communication terminal to instantly print a photo taken by the wireless communication terminal or provides various printed materials as a part of a terminal application service has been popularized.

The thermal transfer printing device uses a method of transferring the ink such as dye or pigment applied to the ink ribbon onto the printing paper by applying heat to the ink ribbon with a thermal print head (TPH). do.

1 illustrates a conventional thermal transfer printing apparatus as an example. As shown, the thermal transfer printing apparatus 200 is configured such that the cartridge 100 is inserted from the side.

In addition, the thermal transfer printing apparatus 200 includes a printer body 210 and a side cover 220 formed with an insertion hole into which the cartridge 100 is inserted, the printer body 210 is printed after printing. and an outlet 212 through which paper is taken out.

The side cover 220 is rotatably installed on the side of the printer body 210 to selectively open and close the cartridge insertion port according to whether the cartridge 100 is mounted or detached.

2 and 3 show the cartridge mounted in the thermal transfer printing apparatus in more detail.

As shown, the cartridge 100 includes a supply reel 120 , a take-up reel 130 , a cartridge cover part 140 , and a pressure spring hole 150 installed in the cartridge body part 110 of the frame structure.

Here, the cartridge body 110 includes a printing paper receiving unit 111 in which printing paper is accommodated, and a ribbon frame 114 in which a supply reel 120 and a take-up reel 130 are mounted to transport the ink ribbon.

The cartridge cover unit 140 is composed of a supply reel cover 140a that covers the supply reel 120 and a take-up reel cover 140b that covers the take-up reel 130, and these covers have a ribbon guide for guiding the transfer of the ink ribbon. are provided respectively.

Therefore, the thermal transfer printing apparatus 200 receives the printing paper and the ink ribbon through the cartridge 100, and then applies heat to the thermal transfer head while placing the ink ribbon on the printing paper so that the ink is transferred (printed). do.

For example, the method of transferring one color by applying heat to the ink ribbon with a thermal transfer head while simultaneously transferring them forward in a state in which the ink ribbon is stacked on the printing paper, and then returning only the printing paper to the rear and transferring the other color is repeated. do.

To this end, the ink ribbon 1 is configured as shown in FIG. 4 as an example.

The ink ribbon 1 of FIG. 4 is disclosed in Patent Application No. 2019-0070111 (filed on June 13, 2019), and a dye ( Including the color ink part 5 to which dye) is applied, it is transferred to the printing paper by the thermal sublimation method.

In this case, a primer layer 4 is included between the base layer 2 and the color ink unit 5 . The primer layer 4 is applied to the surface of the base layer 2 to facilitate the transfer of the dye, and improves the adhesion between the base layer 2 and the color ink unit 5 so that only the dye is sublimated and transferred.

Accordingly, when the amount of heat supplied from the thermal transfer head to the color ink unit 5 is adjusted within a set range, the density at which the dye is transferred to the printing paper is controlled in the range of about 50 to 100%, and various colors can be realized.

On the other hand, the point ink part (P: P1, P2) for giving a point to the printed matter is implemented as a pigment and printed in a thermal melting method, for example, a silver point (P1) mixed with gold pearl and silver pearl It may contain several point inks, including mixed gold points (P2).

Therefore, when a certain amount of heat is supplied from the thermal transfer head to the point ink part (P), the pigment contained in the point ink part (P) is transferred to the printing paper while melting 100% together with the binder to realize the point, and less No melting occurs in

At this time, the pigment of the point ink part (P) uses particles having a size of 4 µm or more for a point feeling that gives a splendid decorative property, and the content is also 50% or more of the point ink part.

Therefore, the point ink part (P) has a relatively small binder content of less than 50%, and the pigment particles are large and easily fall off, or the adhesion with the base layer 2 is weak, so that the pigment is stained even when not during transfer printing or the point A part of the ink part P may come off and contaminate the inside of the printer or may cause a defect in a printed image.

Accordingly, the above-mentioned primer layer 4 is added between the point ink part (P) and the base layer (2), or the binder used for the point ink part (P) is replaced with a high molecular weight polymer or a crosslinking system is introduced. .

However, in this case, because of the excessively strengthened adhesion with the base layer 2, melt transfer is not completely performed during printing, and there is a problem in that thermal adhesion between the printing paper and the ink ribbon occurs.

Patent Publication 10-2015-0088402 Registered Patent 10-1507064 Patent Publication 10-2015-0088402 Registered Patent 10-1486327

The present invention is intended to solve the above problems, and in supplying ink included in a cartridge mounted on a printing device, the ink ribbon is adhered to prevent thermal bonding to the receiving layer of the printing paper during thermal transfer by the printing device. An object of the present invention is to provide an ink ribbon having a heat-adhesive prevention function having a prevention layer.

To this end, the ink ribbon having a thermal adhesion prevention function according to the present invention includes a strip-shaped base layer; a sublimation ink layer provided on one side of the base layer and transferred while the dye is sublimated; a molten ink layer provided on the other side on the base layer and transferred while the pigment is melted; and an anti-adhesion layer provided between the base layer and the molten ink layer and comprising a resin having a binder function to prevent thermal adhesion with the printing paper.

In this case, it is preferable that the sublimation ink layer is a color ink layer that implements color on the printing paper, and the molten ink layer is a point ink layer that implements a point on the printing paper.

In addition, the anti-adhesion layer preferably includes an acrylic resin as the resin having the binder function.

In addition, the acrylic resin preferably has a weight average molecular weight of 10,000 to 100,000 g/mol and a glass transition temperature of 50 to 110°C.

In addition, the anti-adhesion layer preferably further comprises a wax in the acrylic resin.

In addition, further comprising an overcoating layer containing a binder resin for coating to protect the printing surface of the printing paper to which one or more of the sublimation type ink layer and the molten type ink layer is transferred, wherein the adhesion prevention layer is on the base layer It is preferable to apply the overcoat layer together when applying it.

In addition, it is preferable that the anti-adhesion layer is made of the same material as the overcoat layer, and the anti-adhesion layer and the overcoat layer are connected to each other as they are integrally applied.

In addition, it is preferable to further include a primer layer provided between the base layer and the sublimation ink layer.

In addition, the primer layer is provided from the portion where the sublimation ink layer is formed to the portion where the molten ink layer is formed, and the anti-adhesion layer is preferably provided on the primer layer.

As described above, the present invention provides an ink ribbon for supplying ink that is included in a cartridge mounted on a printing apparatus and is thermally transferred to a printing paper. In particular, an anti-adhesion layer is provided between the base layer of the ink ribbon and the molten ink layer to prevent thermal adhesion.

Therefore, it is possible to prevent the ink ribbon from being thermally bonded to the receiving layer on the surface of the printing paper during thermal transfer by the printing device, and to prevent contamination of the inside of the printing device, thereby improving the quality of the printed image.

1 is a view showing a thermal transfer printing apparatus according to an embodiment.
2 and 3 are diagrams illustrating an ink ribbon cartridge according to an embodiment.
4 is a cross-sectional view showing a thermal transfer ink ribbon according to the prior art.
5 is a view showing an ink ribbon cartridge according to another embodiment.
6 is a plan view showing an ink ribbon having a thermal adhesion prevention function according to the present invention.
7 is a cross-sectional view showing an ink ribbon having a thermal adhesion prevention function according to an embodiment of the present invention.
7 is a cross-sectional view showing an ink ribbon having a thermal adhesion prevention function according to another embodiment of the present invention.
9 is a cross-sectional view showing an ink ribbon having a thermal adhesion prevention function according to another embodiment of the present invention.

Hereinafter, an ink ribbon having a thermal adhesion prevention function according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The ink ribbon having a thermal adhesion prevention function according to the present invention is provided through a cartridge, and the cartridge is mounted in a printing apparatus to provide printing paper together with the ink ribbon. In the printing apparatus, the ink contained in the ink ribbon is transferred (printed) to the printing paper.

5, as an embodiment, the cartridge includes a ribbon frame 310, a supply reel 320, a winding reel 330, a supply guide 340, a winding guide 350, and a cassette 360.

In this configuration, the ribbon frame 310 includes a pair of left and right frames spaced apart from each other in the width direction, and the supply guide 340 and the winding guide 350 cross the ribbon frame 310 in a state spaced apart in the front and rear directions, respectively. installed on the

The supply reel 320 is rotatably installed on the ribbon frame 310, and the ink ribbon (refer to '10' in FIG. 6) is guided through the supply guide 340 during rotation. The take-up reel 330 is rotatably installed on the ribbon frame 310 at the rear of the supply reel 320 to wind the ink ribbon 10 drawn in by the take-up guide 350 .

A tension guide 351 may be further provided between the supply reel 320 and the take-up reel 330 . The tension guide 351 is detachably assembled to the fitting frame 352 on both sides thereof, whereby the transfer path of the ink ribbon 10 is sequentially formed.

The cassette 360 is provided at the front end of the ribbon frame 310 and is coupled to the ribbon frame 310 through an assembly method in an embodiment. At this time, the front side is the direction in which the printing paper 20 is drawn out from the cassette 360 . Accordingly, the cassette 360, the supply reel 320, and the take-up reel 330 are sequentially arranged from the rear side to the front side.

According to the above configuration, a plurality of printing papers 20 stacked in the accommodating part of the cassette 360 are slidably drawn out by the printer engine, and transferred from the supply reel 320 to the take-up reel 330 thereon. The ink ribbon 10 is positioned.

As described in detail in Patent Publication No. 2020-0081776, the printer engine includes a servo motor, a gear assembly, a roller for transferring the printing paper and the ink ribbon 10, and the like, the printing paper 20 and the ink ribbon. (10) is transferred at an appropriate timing.

In addition, a thermal print head (TPH) is disposed in an empty space between the supply guide 340 and the winding guide 350 to apply heat to the ink ribbon 10 on which ink is applied. Therefore, printing is made on the printing paper 20 being transferred from the lower side.

For example, in a state in which the ink ribbon 10 is stacked on the printing paper 20, the ink ribbon 10 is transferred forward at the same time and heat is applied to the ink ribbon 10 with a thermal transfer head (TPH) to transfer one color, and then print After returning only the paper 20 to the rear, the method of transferring other colors is repeated.

On the other hand, in the above configuration, the ink ribbon 10 has a thickness of about 7 μm and a width of about 5 cm in the embodiment, is wound on the supply reel 320 a number of times, and the ink ribbon 10 wound on the supply reel 320 . ) is coated with ink having at least one color.

The take-up reel 330 is rotatably mounted on the take-up reel mounting unit 312 and winds up the ink ribbon 10 used for printing while passing through the thermal transfer head TPH. That is, after printing, the ink ribbon 10 in which the dye is sublimated or the pigment is melted is recovered.

6 is a plan view showing an ink ribbon 10 having a thermal adhesion prevention function according to the present invention. As an embodiment, the ink ribbon 10 has a sublimation ink layer 12 and a molten ink layer 13 from the front side. and an overcoat layer 15 .

The sublimation ink layer 12 is composed of a dye to implement colors such as cyan, magenta and yellow, and uses a sublimation method according to the amount of heat transferred from the thermal transfer head. (20) is transcribed.

Specifically, when the amount of heat supplied from the thermal transfer head to the color ink unit is adjusted within a set range, various colors can be realized by controlling the density transferred from the color ink unit to the printing paper 20 in a range of about 50 to 100%.

The molten ink layer 13 may include at least one point layer (P1, P2), for example, a glossy silver color mixed with gold pearl, and a gloss mixed with the first point layer (P1) and silver pearl I may include the second point layer P2 in gold color.

The molten ink layer 13 may be composed of a pigment that is thermally melted by the amount of heat transferred from the thermal transfer head. % As it melts, it is transferred to the printing paper 20 to implement a point, below which melting does not occur.

The overcoating layer 15 provided in the rear part of the ink layer 13 is for forming an overlay layer that protects the printing surface of the printing paper 20 , and the color ink layer 12 according to the type of the ink layer 13 . ) and at least one of the point ink layer 13 is transferred and then coated.

<Example>

On the other hand, the ink ribbon 10 having an anti-thermal adhesion function according to the present invention includes a base layer 11 , a sublimation ink layer 12 , a molten ink layer 13 , and an adhesion prevention layer 14 . In addition, it further includes an overcoat layer 15 , a primer layer 16 , a discrimination layer 17 , and a heat-resistant layer 18 .

At this time, as shown in FIG. 7 , in the present invention, the sublimation ink layer 12 and the molten ink layer 13 (point ink layer) are disposed adjacent to each other on the base layer 11 in an embodiment. In addition, an anti-adhesion layer 14 is laminated between the molten ink layer 13 , and a primer layer 16 is laminated between the base layer 11 and the sublimation ink layer 12 .

As shown in FIG. 8 , in another embodiment of the present invention, since the anti-adhesion layer 14 and the overcoat layer 15 are made of the same material, they may be integrally applied on the base layer 11 . Accordingly, the anti-adhesive layer 14 and the overcoating layer 15 may be configured as one connected layer. That is, if the materials are the same or similar as shown in FIG. 7 , they may be applied while being spaced apart from each other by a certain distance, but may be connected to each other through one application.

9, the present invention is another embodiment by applying the primer layer 16 to the entire ink layer (sublimation type and melt type), the primer layer 16 and the anti-adhesion layer 14 on the base layer 11 After being sequentially laminated, a molten ink layer 13 is laminated on the anti-adhesion layer 14 . The sublimation ink layer 12 is laminated on the primer layer 16 as above.

However, in the primer layer 16, the portion provided with the sublimation ink layer 12 and the portion provided with the molten ink layer 13 may be separated from each other, but each portion may be connected to each other through integral application. . That is, the primer layer 16 may be continuously formed to extend from the sublimation ink layer 12 to the molten ink layer 13 .

In addition, the overcoat layer 15 as described above is provided next to the molten ink layer 13 . Accordingly, on the base layer 11, the sublimation ink layer 12, the molten ink layer 13 and the overcoat layer 15 are disposed in the order of transfer (lengthwise order), and the identification layer 17 is disposed between them. These are placed respectively.

In addition, the lower surface of the base layer 11 may further include a heat-resistant layer 18 to protect the base layer 11 when heat is transferred adjacent to the thermal transfer head.

<Base layer>

On the other hand, in the above configuration, the base layer 11 is a base layer configured to be elongated in a strip shape to support the ink ribbon 10 , and can transmit heat to the ink layer 13 and the overcoat layer 15 , and sufficient mechanical stability It may be made of a material with

For example, the base layer 11 may include polyester such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polyacrylate, polycarbonate, cellulose ester, and polyimide in consideration of the heat resistance and strength of the ink ribbon 10 . It may include one or more selected from the group consisting of, it is preferable to use polyethylene terephthalate in terms of mechanical stability and heat transfer.

The thickness of the base layer 11 may be generally 0.5 to 50 μm, but is preferably 4 to 6 μm in terms of effectively performing the role of the heat transfer substrate layer 11 .

The base layer 11 of the present invention is, for example, the base strength expressed by the ratio S1/S2 of the breaking strength S1 (MPa) and the breaking elongation S2 (MPa) measured according to JIS C2151 in the longitudinal direction is 2.5 or more 5.0 It is below, More preferably, it is 3.0 or more and less than 4.0.

In addition, the base layer 11 may have, for example, a heat shrinkage (%) of 5.0 or less, preferably 2.5% or less, or 0.5 to 2.5%, measured in JIS C2151 at 150° C. for 30 minutes in the longitudinal direction. .

<Anti-adhesion layer>

The anti-adhesion layer 14 is to prevent the ink ribbon 10 from being thermally attached to the printing paper 20 according to thermal transfer, and is provided in the portion where the point ink layer, which is the molten ink layer 13, is applied.

To this end, the anti-adhesion layer 14 is laminated on a portion of the upper surface of the base layer 11 to which the molten ink layer 13 is applied, and a material having a binder function to prevent thermal bonding with the receiving layer of the printing paper 20 surface. of resin.

In one embodiment, in order to provide the anti-adhesion layer 14 under the molten ink layer 13, the anti-adhesion layer 14 is provided directly on the base layer 11, and then the molten ink layer 13 is formed thereon. It can be done (see FIG. 7).

In another embodiment, when the material of the anti-adhesion layer 14 is used as the same material as the overcoat layer 15, a structure connected to each other can be provided by integrally applying the anti-adhesion layer 14 and the overcoating layer 15 ( see Fig. 8).

In another embodiment, when the primer layer 16 is applied from the sublimation ink layer 12 to the molten ink layer 13, an anti-adhesion layer 14 is applied on the primer layer 16 and then the molten ink layer (13) can be formed (see Fig. 9).

As will be described later, when the same material as the overcoat layer 15 is used for the anti-adhesion layer 14, the overcoat layer 15 (eg, a protective upper layer) is simultaneously applied with the anti-adhesion layer 14 by a gravure printing method. to simplify the process.

On the other hand, the anti-adhesion layer 14 may include at least a part of a basic function (eg, first applied to the surface of the substrate layer to facilitate printing on the surface of the ink ribbon) as a primer defined in the printing technology field.

However, in the present invention, the anti-adhesive layer 14 prevents thermal adhesion to the printing paper 20 in the process of thermal transfer as the heat transferred from the thermal transfer head is transferred to the molten ink layer through the base layer 11. is the main purpose of Thermal bonding is prevented because it occurs in the amount of applied heat, material properties, and chemical reaction during thermal transfer.

Accordingly, the anti-adhesion layer 14 is provided between the base layer 11 and the molten ink layer 13 and preferably includes an acrylic resin. Furthermore, wax may be further included in the acrylic resin.

The acrylic resin is a resin serving as a binder, and while providing adhesion between the molten ink layer 13 and the base layer 11, heat transfer is possible due to heat transfer properties. In particular, the molten ink layer 13 is prevented from being thermally bonded to the printing paper 20 .

For this purpose, the acrylic resin preferably has a weight average molecular weight of 10,000 to 100,000 g/mol and a glass transition temperature of 50 to 110°C. When the molecular weight of the acrylic resin is too high, transferability is insufficient, and when the molecular weight is low, durability is deteriorated. In addition, if the glass transition temperature is too low, durability is deteriorated, and if the glass transition temperature is high, the releasability is insufficient.

The weight average molecular weight may be measured, for example, as a polystyrene equivalent molecular weight analyzed by gel permeation chromatography, and the glass transition temperature may be measured using differential scanning calorimetry (DSC).

In addition, the anti-adhesive layer 14 of the present invention may further include a wax in the acrylic resin. Wax plays a role in allowing 100% melt transfer to the printing paper side because of good release (peelability) from the substrate during thermal transfer.

When the wax is included together with the acrylic resin, the melt transferability (peelability or releasability) is improved as well as the durability (abrasion resistance). Therefore, when the transferability is not good, even though the point ink layer in the printing area is attached to the printing paper during printing, the opposite part does not separate from the base layer 11 (incomplete melt transfer) and heat bonding of the ink ribbon and the printing paper is prevented. .

<Ink layer>

The ink layers 12 and 13 are laminated (applied) on a specific portion on the base layer 11 and transferred to the printing paper 20 by a thermal transfer head.

The ink layers 12 and 13 include a sublimation ink layer 12 that is transferred while the dye is sublimed and a molten ink layer 13 that is transferred while the pigment is melted, and the sublimation ink layer 12 is a primer layer. It is provided on (16), and the molten ink layer (13) is provided on the anti-adhesion layer (14).

At this time, the sublimation ink layer 12 is a 'color ink layer' that implements colors (eg, C, M, Y) on the printing paper 20 , and the molten ink layer 13 is applied to the printing paper 20 . It is preferable that it is a 'point ink layer' that implements a point (eg, S, G).

Ink is largely divided into sublimation ink and molten ink according to their properties. In the sublimation ink, only the sublimation dye is transferred to the receiving layer on the surface of the printing paper in proportion to the heat energy applied by the thermal element of the thermal transfer printer, so that an image is formed. The amount of dye transferred in proportion to thermal energy can be controlled (approximately 50% to 100%) in proportion to the thermal energy in the manner in which it is formed.

However, sublimation inks are excellent in forming full-color images by mixing yellow (Y), magenta (M), and cyan (C) colors, but express splendor such as pearl, fluorescent, luminous, glass or metallic luster. There are insufficient problems to do this.

For example, when printing nail stickers, it is possible to print various colors of background colors or images with sublimation ink, but it is insufficient to express shiny pearls or silver or gold colors with metallic luster on the background color.

In order to solve this problem, a point ink layer 13 is further included separately from the color ink layer 12 , and the point ink layer 13 is a molten ink between the color ink layer 12 and the overcoat layer 15 . is formed with

In addition, the point ink layer 13 may be provided in one or two or more places between the color ink layer 12 and the overcoat layer 15 . In an embodiment, two point ink layers 13 including a first point layer P1 and a second point layer P2 may be included.

As described above, the anti-adhesion layer 14 of the present invention is provided between the point ink layer 13 and the base layer 11, so that the ink ribbon 10 is thermally bonded when transferred to the printing paper 20 in a molten manner. to prevent deterioration of print image quality.

<Primer layer>

The primer layer 16 is provided between the base layer 11 and the sublimation ink layer 12 to improve adhesion therebetween. By using a material with low dyeability as the primer layer 16 , the primer layer Compared with the case without (16), the flammability density can be improved.

In addition, the primer layer 16 may be applied to extend to the molten ink layer 13 in addition to the sublimation ink layer 12 when applied on the base layer 11 .

When the primer layer 16 is extended and applied, as shown, the sublimation ink layer 12 to the molten ink layer 13 are integrally connected or other sublimation ink layer 12 and the molten ink layer (13) The primer layer 16 may be provided by separating each part.

Accordingly, the primer layer 16 is provided between the base layer 11 and the sublimation ink layer 12 as well as between the base layer 11 and the molten ink layer 13, and the molten ink layer 13 has It further includes an anti-adhesion layer (14).

The resin forming the primer layer 16 is, for example, a polyester-based resin, polyvinylpyrrolidone resin, polyvinyl alcohol resin, hydroxyethyl cellulose, polyacrylic acid ester-based resin, polyvinyl acetate-based resin, and polyurethane-based resin. , Styrene acrylate resin, polyacrylamide resin, polyamide resin, polyether resin, polystyrene resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, vinyl chloride-vinyl acetate copolymer, poly There are polyvinyl acetal-based resins such as vinyl acetal or polyvinyl butyral, and among them, it is preferable to use a vinyl chloride-vinyl acetate copolymer in consideration of the adhesion of the base layer 11 .

As another example, the dye primer layer 16 may be composed of ultrafine colloidal inorganic pigment particles. According to this configuration, it is possible to prevent the transfer of the sublimation dye from each dye layer to the dye primer layer 16 side during image formation. Accordingly, it is possible to effectively diffuse the dye into the printing paper receiving layer during thermal transfer, so that an image with a high print density can be formed.

As an example of the colloidal inorganic pigment ultrafine particles, a conventionally known compound may be used. For example, silica (colloidal silica), alumina or alumina hydrate (alumina sol, colloidal alumina, cationic aluminum oxide or its hydrate, boehmite pseudo-boehmite, etc.), aluminum silicate, magnesium silicate, magnesium carbonate, magnesium oxide, titanium oxide and the like.

In particular, colloidal silica and alumina sol are preferably used. The size of these colloidal inorganic pigment ultrafine particles is preferably 100 nm or less, preferably 50 nm or less as the primary average particle diameter.

In addition, as an example, in constructing the primer layer 16, the coating solution may be prepared using parachlorophenol and toluene, methyl ethyl ketone, etc. as a solvent, and furthermore, parachlorophenol as one of the binders, vinyl chloride-vinyl acetate It can be used by adding a copolymer.

The primer layer 16 is formed by applying a coating solution for the dye primer layer 16 in which ultrafine colloidal inorganic pigment particles are dissolved or dispersed in a suitable solvent by a gravure coating method, a roll coating method, a screen printing method, or a reverse roll coating method using a gravure plate. It can be formed by coating and drying by conventionally well-known forming means, such as these. At this time, it is preferable that the coating amount of the coating liquid for dye primer layer 16 is the range of 0.02 g/m<2> or more and 1.0 g/m<2> or less.

<Overcoating layer>

The overcoat layer 15 is laminated on the base layer 11, and after the ink layer 13 including any one or more of the sublimation ink layer 12 and the molten ink layer 13 is transferred according to a printing method The printing surface of the printing paper 20 is protected.

To this end, the overcoating layer 15 includes 'a binder resin for coating', and as the overcoating layer 15 is also transferred to the printing paper 20 by the thermal transfer head, a layer is formed on the printing surface on which an image is formed.

Specifically, the overcoat layer 15 is laminated to protect the ink transferred to the printing paper 20 from thermal or mechanical stress in advance to form an overlay layer, and is provided at a position adjacent to the point ink layer 13 can be

The overcoat layer 15 is not particularly limited as long as it is a material used in the art, but an acrylic resin is widely used. For example, the overcoat layer 15 may be formed of a composition including an acrylic resin, a wax, and a solvent. In this case, it has excellent durability as well as releasability, so it is suitable for manufacturing a sheet for nail decoration.

In addition, the thickness of the overcoat layer 15 is preferably 0.5 to 2㎛. The overcoating layer 15 may include a protective upper layer 14a containing an acrylic resin and wax, and a lower protective layer 14b containing an acrylic resin or PVC-based resin and no wax.

The protective upper layer and the lower protective layer are usually named based on the state in which they are transferred and coated on the printing paper.

On the other hand, as the acrylic resin of the overcoat layer 15, methyl methacrylate-butyl methacrylate copolymer (PALALOID B-66, B-60, etc.) or polymethyl methacrylate (DIANAL BR-83) may be used. can

When the molecular weight of the acrylic resin is too high, transferability is insufficient, and when the molecular weight is low, durability is deteriorated. In addition, when the glass transition temperature is too low, durability is deteriorated, and when the glass transition temperature is high, there is a disadvantage in that the releasability is insufficient.

Accordingly, the acrylic resin may have a weight average molecular weight of 10,000 to 100,000 g/mol, and a glass transition temperature (Tg) of 50 to 110° C., through which the overcoating layer 15 is the same as the above-described anti-adhesion layer 14 Or it can be seen that it is composed of a similar material.

That is, the present invention introduces the material (binder resin for coating) of the overcoat layer 15 into the adhesion prevention layer 14 to prevent thermal adhesion between the ink ribbon 10 and the printing paper 20 during thermal transfer. By including at least a part of the binder resin for coating, thermal adhesion is prevented while providing an excellent effect of thermal transfer properties.

However, since the above overcoating layer 15, particularly the protective upper layer, is the same or similar material to the above-described anti-adhesion layer 14, the molten ink layer 13 is applied while applying the protective upper layer, which is an acrylic resin, to the base layer 11. It has already been described above that the anti-adhesion layer 14 can also be created by applying it together.

<Identification layer>

On the other hand, the identification layer 17 is to discriminate a color between each ink layer 13, and has a sufficient width that can be detected by the sensor from the front of each of the ink ribbons 10 based on the moving direction during printing. is formed

Typically, the identification layer 17 has a black dot or bar shape. In addition, a black band-shaped start mark or end mark may be formed at the start or end of the thermal transfer ink ribbon 10 .

<Heat-resistant layer>

The heat-resistant layer 18 is applied to the back surface of the base layer 11 to prevent the base layer 11 from being melted by thermal energy emitted from the thermal transfer printer and is formed.

The heat-resistant layer 18 is preferably composed of a binder and a lubricant having a high glass transition temperature. For example, polyvinyl acetal or polyester resin may be used as the binder, and silicone oil may be used as the lubricant.

In more detail, it is preferable to form the heat-resistant layer 18 with a composition including polyvinyl acetal, polyester, amino-modified silicone oil, and a solvent.

In addition, as a solvent used for coating the heat-resistant layer 18, for example, a mixture of ketone, toluene, ether, alcohol, hydrocarbon, etc. may be used. Preferably, a mixed solvent of methyl ethyl ketone and toluene is used.

The heat-resistant layer 18 preferably has a thickness of 0.1 to 2 μm in terms of more effectively preventing the heat transfer ribbon from being fused to the heating element.

In the above, specific embodiments of the present invention have been described above. However, the spirit and scope of the present invention are not limited to these specific embodiments, but various modifications and variations are possible within the scope that does not change the gist of the present invention. You will understand when you grow up.

Therefore, since the embodiments described above are provided to fully inform those of ordinary skill in the art to which the present invention belongs the scope of the invention, it should be understood that they are exemplary in all respects and not limiting, The invention is only defined by the scope of the claims.

10: ink ribbon
11: base layer
12: sublimation ink layer (color ink layer)
13: molten ink layer (point ink layer)
14: anti-adhesion layer
15: overcoat layer
16: primer layer
17: identification layer
18: heat-resistant layer
20: printing paper

Claims (9)

Strip-shaped base layer 11 and;
a sublimation ink layer 12 provided on one side of the base layer 11 and transferred while the dye is sublimated;
a molten ink layer 13 provided on the other side on the base layer 11 and transferred while the pigment is melted; and
An anti-adhesion layer 14 provided between the base layer 11 and the molten ink layer 13 and comprising a resin having a binder function to prevent thermal adhesion with the printing paper 20; Ink ribbon having a thermal adhesion prevention function, characterized in that. According to claim 1,
The sublimation ink layer 12 is a color ink layer that implements color on the printing paper 20,
The molten ink layer 13 is an ink ribbon having a heat-adhesive preventing function, characterized in that it is a point ink layer to implement a point on the printing paper (20). According to claim 1,
The anti-adhesion layer 14 is,
Ink ribbon having a thermal adhesion prevention function, characterized in that it contains an acrylic resin as the resin having the binder function. 4. The method of claim 3,
The acrylic resin has a weight average molecular weight of 10,000 to 100,000 g/mol, and a glass transition temperature of 50 to 110° C. 4. The method of claim 3,
The anti-adhesion layer 14 is,
Ink ribbon having a thermal adhesion prevention function, characterized in that it further comprises a wax in the acrylic resin. According to claim 1,
An overcoating layer 15 containing a binder resin for coating to protect the printing surface of the printing paper 20 to which any one or more of the sublimation ink layer 12 and the molten ink layer 13 is transferred is further included but,
The anti-adhesion layer (14) is an ink ribbon having a thermal adhesion prevention function, characterized in that it is applied together when the overcoat layer (15) is applied on the base layer (11). 7. The method of claim 6,
The anti-adhesion layer 14 is made of the same material as the overcoat layer 15,
The anti-adhesive layer (14) and the overcoating layer (15) are integrally applied and are connected to each other. According to claim 1,
Ink ribbon having a thermal adhesion prevention function, characterized in that it further comprises a primer layer (16) provided between the base layer (11) and the sublimation ink layer (12). 9. The method of claim 8,
The primer layer 16 is provided from the portion where the sublimation ink layer 12 is formed to the portion where the molten ink layer 13 is formed,
The anti-adhesive layer (14) is an ink ribbon having a thermal adhesion preventing function, characterized in that provided on the primer layer (16).

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