JPH08150786A - Sublimation type heat transfer body - Google Patents

Abstract

PURPOSE: To provide a sublimation type heat transfer body of superior image quality and without image unevenness by specifying the traveling speed transferable to a recording paper and the miximum filter waviness on the surface. CONSTITUTION: A sublimation type heat transfer body is composed of a substrate 3, an intermediate layer 2, an ink layer 4 and a low dyeing layer 1. In the sublimation type heat transfer body transferable to a recording paper 5 at the traveling speed of 1/n (n>1), the maximum filter waviness is set to be WCM(μm)<=2.0. A sublimation dye of a particle shape is contained in an ink layer 4, and the ink layers 4 forming a ribbon is in the surface order, and the centerline surface roughness is Ra<=0.5μm, while the thickness of the ink layer 4 is 3μm or more. Also the maximum filter waviness to the recording paper 5 in the sub-scanning direction is WCM(μm)<=1.5. The ink layer 4 is coated by the screen printing method, and the mesh size of the skin meshes used in the screen printing is #200 or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In recent years, the demand for full-color printers has been increasing year by year. There are electrophotographic method, ink jet method, thermal transfer method and the like as a recording method of this full color printer. Among them, the thermal transfer method is often used because of easy maintenance and no noise. In this heat-sensitive transfer method, a recording medium having a transfer layer in which a colorant is dispersed in a heat-fusible substance is superposed on an image-receiving sheet, and heat is applied to the recording medium imagewise by a thermal head or laser light. Hot-melt thermal transfer recording, in which the transfer layer is heat-melted and transferred and recorded on the image-receiving sheet, and a transfer layer containing a thermal sublimation dye or a heat transferable dye (hereinafter simply referred to as sublimation dye). Sublimation type thermal transfer recording in which a recording medium having the above is superposed and an image-wise heat is applied to the recording medium so that the dye in the transfer layer is sublimated or transferred onto the image-receiving sheet for recording. In particular, sublimation type thermal transfer recording is considered to be the most suitable method for a full color printer because it has an advantage that an intermediate layer can be easily obtained because a dye is transferred in a monomolecular form to thermal energy from a thermal head in principle. .

The ribbon of this sublimation type thermal transfer recording method is in the form of a three- or four-color surface sequential ribbon of yellow, magenta, cyan and, if necessary, black, and gravure printing is generally used as the surface sequential application method of the ink layer. Known to. Also, in recent years, a method for recording at a constant number of times as a thermal transfer member having a low running cost, or a method of recording at a conveyance speed of an image receiving sheet n times (n> 1) the conveyance speed of an ink sheet, so-called n times A modal recording method has been proposed. In this n-fold mode recording method, the unused portion of the ink layer is always supplied in order to feed while gradually shifting the overlap between the used portion of the ink layer before and the used portion of the subsequent (next) time. Therefore, there is an advantage in that the variation in the remaining ink amount due to the recording history can be reduced as compared with the constant velocity multi-time recording method in which the used portion is merely repeatedly used. Further, as the transfer recording medium, a transfer medium having a dye layer in which a particulate sublimation dye is dispersed in a resin is provided on a substrate (JP-A-1-157891), or the transfer amount of the dye on the substrate. Provide a relatively thick dye layer (Japanese Patent Laid-Open No. 2-5
No. 86 publication) is proposed. This many times and n
The double-mode ink layer requires a thicker ink layer than a one-time ribbon, and general gravure printing requires repeated coating several times. In particular, the n-fold mode recording ink layer can be narrowed to a maximum of 1 / n (n> 1) in the flow direction at the time of recording, and the running cost can be further reduced by narrow-width surface sequential coating. A screen printing method is suitable as the method.

However, for example, when a dye layer is formed in the above printing method, the traces of gravure cells and the screen mesh often appear as uneven adhesion of the dye layer due to the principle of the printing method. The unevenness causes uneven contact between the ink layer and the image receiving layer at the time of image transfer, resulting in lack of image uniformity. On an image obtained by the multiple recording method, particularly the n-times mode recording method, the image unevenness becomes an abnormal image enlarged and emphasized by n times. Further, as a sublimation type thermal transfer member which solves this problem, Japanese Patent Application Laid-Open No. HEI 2
Although the surface roughness is specified in No. 233292, it is not possible to satisfy all the above requirements by only this.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sublimation type thermal transfer member having no image unevenness and excellent image quality.

[0005]

According to the present invention, firstly, in a sublimation type thermal transfer member capable of being transferred to a recording paper at a traveling speed of 1 / n (n> 1), the maximum waviness of surface wave :
There is provided a sublimation type thermal transfer member characterized in that WCM (μm) has a relationship of the following formula: WCM (μm) ≦ 2.0 Secondly, it has an ink layer containing a particulate sublimation dye. The sublimation-type thermal transfer member is provided, and thirdly,
There is provided the sublimation-type thermal transfer member characterized in that the ink layer forming the ribbon is frame-sequential, and fourthly, the centerline surface roughness Ra ≦ 0.5 μm. A thermal transfer member is provided. Fifth, the sublimation type thermal transfer member is characterized in that the thickness of the ink layer is 3 μm or more. Sixth, the maximum waviness in the sub-scanning direction with respect to the recording paper: There is provided the sublimation type thermal transfer member in which WCM (μm) has a relation of the following formula: WCM (μm) ≦ 1.5 Seventh, the ink layer is applied by a screen printing method. A thermal transfer member is provided. Eighth, there is provided a method for producing the sublimation type thermal transfer member, characterized in that the mesh size of the screen mesh used in the screen printing is # 200 or more. There is provided the sublimation-type thermal transfer member, which has a liquid viscosity at a speed of 3.8 (1 / s) of 30 Pa · s or less (25 ° C.).

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described more specifically. FIG. 1 shows the configuration of a sublimation type thermal transfer member. 1 is a low dyeing resin layer, 2 is an intermediate layer, 3 is a support,
Reference numeral 4 is an ink layer, 5 is an image receiving sheet, and 6 is a thermal head. FIG. 2 is an explanatory view of the method for measuring the maximum filtered wave and the centerline surface roughness of the present invention. In FIG. 2, 7 represents a measurement sample, and 9 represents a cylindrical metal drum whose surface is mirror-finished. The sample 7 is adhered to the surface of the metal drum 9 by a fixing jig 8 so that the measuring portion does not wrinkle. Reference numeral 10 denotes a measuring needle portion, the scanning direction of which is shown in FIG. The measurement conditions are: cutoff: 0.08 mm, maximum measurement: 8 mm, filter length: 8 mm, and centerline surface roughness: cutoff: 0.08 m
m, measurement length: 4 mm, and measurement speed is 0.0
It was set to 3 mm / sec.

By the way, the unevenness of the ink surface causes uneven contact between the ink layer and the image receiving layer at the time of image transfer, resulting in a lack of image uniformity. When the maximum waviness (WCM) of the surface is out of the range of the present invention, the adhesion unevenness is caused by the ink layer-
In some cases, air is present between the image receiving layers and there is no contact, and the image is completely missing dots. In other words, the contact pressure between the ink layer and the image receiving layer varies depending on the size of the waviness, which results in a difference in sensitivity and the degree of image density unevenness, and the maximum waviness of filtered ink on the ink surface has a relationship of WCM ≦ 2.0 μm. A sublimation type thermal transfer member can be obtained with good image uniformity. In particular, the unevenness of the surface in the sub-scanning direction with respect to the scanning direction during image printing causes n-fold image unevenness in the n-fold recording mode, so the maximum waviness in the sub-scanning direction is WCM ≦ 1.5.
(Μm) makes it possible to obtain a higher quality image. Even when the unevenness of the ink layer is the same as the maximum waviness of the filtered light, if the layer thickness of the ink layer (mainly the thickness of the layer having the sublimation dye) is different by less than 3 μm, especially in the multi-time recording method, the convex portion is formed. The uneven image is emphasized due to the difference in sensitivity between the concave portions and the difference in the dye supply amount. Further, the surface shape of the image receiving sheet provided with the image receiving layer similarly affects the image quality, and the center line surface roughness Ra is preferably in the range of Ra ≦ 0.5 μm.

The ink layer has a single-layer structure and a laminated structure, and by providing a density gradient and a diffusion coefficient gradient, excellent multiple recording is possible. To get a high number of times,
It is preferable that the ink layer contains a particulate dye (undissolved particulate dye) to form a dye supply layer. However, the term "particulate dye" as used herein means a dye that does not dissolve in the organic binder and precipitates as particles after the ink (organic binder + sublimable dye + solvent) is applied and dried when the ink layer is formed. , Its presence can be easily confirmed by an electron microscope. The particle size of the particulate dye varies depending on the layer thickness of the dye supply layer, but is 0.01μ.
m to 20 μm, preferably 0.1 μm to 1 μm. The thickness of the dye supply layer is generally 0.1 μm.
m to 20 μm, preferably 2 μm to 10 μm.
In the case of a laminated structure, a dye transfer contributing layer is further provided on the dye supplying layer. Its thickness is generally from 0.05 μm to
It is 5 μm, preferably 0.1 μm to 1.5 μm.
Further, the ratio of the organic binder forming the ink layer and the sublimable dye: sublimation dye / organic binder is preferably 5/1 or less, and the smaller the ratio, the better the image uniformity becomes. it can.

The surface properties of the ink layer greatly differ depending on the method of applying the ink layer, and the desired surface properties of the present invention can be easily formed by a method such as a roll coater or a nozzle coater in which only the coating liquid is in direct contact with and applied. But,
Like the method described above for applying the ink layer as a frame sequential ribbon, gravure printing, screen printing, in which the coating liquid is applied through a gravure cell, a screen mesh, etc.
For the system such as the rod coater, devise the coating liquid. For example, it is necessary to add a leveling agent or to use a solvent having a low viscosity and a low evaporation rate. In particular, the viscosity of the coating solution affects this leveling, so the shear rate is 3.8.
Liquid viscosity at (1 / s) is 30 Pa · s or less (25 ° C),
Preferably, the ink layer having the desired surface properties of the present invention can be formed by suppressing the pressure to 10 Pa · s or less (25 ° C.). Further, depending on the mechanical conditions, it is possible to form an ink layer having the desired surface properties of the present invention by reducing the size of the gravure cell or screen mesh. Further, it has been found that the image uniformity is higher when the pitch of the unevenness of the ink surface is larger by changing the screen mesh or the like. This measurement can be performed at the same time as the WCM measurement, and it is calculated as an average mountain interval: WCA-Sm. When WCA-Sm ≧ 500 μm, the image uniformity is high.

In the case of an ink layer in which a particulate dye is mixed in the ink layer, cell-like unevenness may occur due to convection in the coating film during film formation (a process in which the solvent is evaporated from the wet film). Also, the particles may cause surface irregularities in a minute range. that is,
It may be uneven due to aggregation of the particulate dye or may be coarse particles. This is a layer having a particle dye only, or a member having a surface property higher than that of the ribbon layer after the ink layer is formed (preferably, a mirror-finished metal roller).
There is a method of smoothing the surface property of the ink layer by applying a load (using heat, if necessary) together with. The unevenness in this minute range also affects the image quality, and particularly when it is convex, scratches (concave) occur on the image receiving layer after printing. This surface property can be grasped as the center line surface roughness, and the ribbon surface can be measured as the center line surface roughness: R
When the condition of a ≦ 0.5 μm is further satisfied, a sublimation type thermal transfer member with further improved image uniformity can be obtained.

The sublimable dye used in the present invention is 60
It is a dye that sublimes or vaporizes at a temperature of not less than 0 ° C., and may be any dye mainly used in thermal transfer printing such as disperse dyes and oil-soluble dyes. I. One of Disperse Yellow,
3, 8, 9, 16, 41, 54, 60, 77, 116, etc., C.I. I. Disperse Red 1, 4, 6, 11,
15, 17, 55, 59, 60, 73, 83, etc., C.I.
I. Disperse Blue 3, 14, 19, 26, 5
6, 60, 64, 72, 99, 108, etc., C.I. I. Solvent Yellow 77, 116, C.I. I. Solvent Red 23, 25, 27, etc., such as C.I. I. Solvent blue 36, 83, 105 and the like can be mentioned. These dyes can be used alone, but can also be used as a mixture of several kinds.

As the binder, a thermoplastic resin or a thermosetting resin is used, and as the resin having a relatively high glass transition point or a high softening property, for example, vinyl chloride resin, vinyl acetate resin, polyamide, polyethylene, Examples thereof include polycarbonate, polystyrene, polypropylene, acrylic resin, phenol resin, polyester, polyurethane, epoxy resin, silicone resin, fluororesin, butyral resin, melamine resin, natural rubber, synthetic rubber, polyvinyl alcohol, and cellulose resin. These resins can be used alone, but several kinds may be mixed or a copolymer may be used.

Next, the low dyeing resin layer will be described. The low-dyeing resin layer can prevent ghosts when colors are overlapped by providing it on the above-mentioned ink layer, and as long as a dye is not contained in the low-dyeing resin layer, the low-dyeing resin layer is provided on two or more color-sequential color material layers. Even if it is located at the position, by removing the dye, it is possible to form it by one-step coating (all solid coating) using one type of coating liquid. As the binder used in this layer,
The resin to be examined is evaluated as a resin for an image receiving layer, and a resin having a low recording density is suitable as the resin.

Specifically, it is evaluated and determined by the following method. Synthetic paper YUPO FPG # 95 (manufactured by Oji Yuka Co., Ltd.) as a base, dissolved in a volatile solvent in an amount of 5 to 20 wt% in each studied resin solution, 30 wt% of resin solids modified silicone oil SF8411 / SF8427 = 1 / A liquid containing 1 (manufactured by Toray Silicone Co., Ltd.) is dried at 70 ° C. for 1 minute and then at room temperature for 1 day or more so that the dry film thickness is about 10 μm. Next, the image-receiving paper formed as described above, the color sheet for the Mitsubishi color video processor SCT-CP200, and the cyan ribbon are overlaid, and the thermal head KMT-85-6MP having a resolution of 6 dots / mm and an average resistance of 542Ω.
Recording was performed at 2.00 mj / dot using D4 (manufactured by Kyocera Corp.), and the recording density was evaluated by a reflection densitometer RD-918. As a result, the recording density was 1.2 or less, preferably 1.0 or less. Is used as the low dyeing resin layer. As a result, as a preferable resin of the low-dyeability resin layer binder,
Aromatic polyester resin, styrene butadiene resin, polyvinyl acetate resin, polyamide resin and further particularly preferred resins as methacrylate resin or copolymer, styrene-maleic acid ester copolymer, polyimide resin, acetate resin, silicone resin, styrene / Acrylonitrile resin, polysulfone resin, celluloses, gelatin, polyvinyl alcohol, poly (meth) acrylics, polyacrylamide, aqueous urethane resin, aqueous acrylic resin and the like. The thickness of the low-dyeing resin layer is generally 0.05 to 5 μm, preferably 0.1 to 2.0 μm.
m.

When the low dyeability resin layer is laminated on the ink layer, it is preferable to use a solvent having a low dye solubility of the ink layer as the solvent to be used, and particularly an alcohol solvent containing 80% or more. Good to do. As the alcohol solvent, methanol, ethanol, n-propanol, n-butanol, iso-propanol, iso-butanol, s-butanol, t-butanol, n-hexanol, 2-ethylbutanol, n-octanol,
2-ethylhexanol, cyclohexanol, benzyl alcohol and the like can be mentioned. Desirably, the low-dyeability resin layer contains a hydrolysis product of a silane coupling agent to prevent sticking (fusion) which tends to occur during n-fold printing.

The hydrolysis product of such a silane coupling agent is a hydrolysis product of a mixture of a bifunctional silane coupling agent and a trifunctional silane coupling agent, and has a three-dimensional three-dimensional structure. It is a substance. Examples of the bifunctional silane coupling agent include dimethylenedichlorosilane, diphenyldichlorosilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, N-β (aminoethyl) γ. -Aminopropylmethyldimethoxysilane and the like can be used. As the trifunctional silane coupling agent, methyltrichlorosilane, phenyltrichlorosilane, methyltrimethoxysilane, phenyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-chloropropyltrisilane. Methoxysilane or the like can be used. Next, as the substrate, condenser paper, polyester film, polystyrene film,
Films such as polysulfane film, polyimide film, and polyaramid film are used, and a conventional adhesive layer (also referred to as an intermediate adhesive layer) or the like may be provided between the substrate and the dye supply layer, if necessary. In addition, a heat resistant lubricant conventionally used (also referred to as a heat resistant layer) may be provided on the back surface of the substrate.

Up to this point, the recording method using a thermal head has been described in mind, but the sublimation type thermal transfer material of the present invention is a method of recording by means other than the thermal head, for example, a thermal printing plate, a laser beam, or a substrate. It can also be used for a method by heat generated in a medium such as. Among them, the electrothermal transfer method using Joule heat generated in the medium is well known, and USP 4,103066, JP-A-57-14060, JP-A-57-11080, and JP-A-59-9096. It is described in many publications such as the Gazette. When used in this electrothermal transfer method, as a substrate, relatively heat-resistant polyester, polycarbonate, triacetyl cellulose, nylon, polyimide, resin such as aromatic polyamide aluminum, copper,
A support in which a metal powder of iron, tin, zinc, nickel, molybdenum, silver, etc. and / or a conductive powder of carbon black is dispersed to adjust the resistance value between an insulator and a good conductor, and these supports In addition, a support obtained by vapor-depositing or sputtering a conductive metal as described above may be used. Considering the Joule heat conduction efficiency, the thickness of these substrates is 2-1.
It is preferably about 5 μm. Further, when used in the laser light transfer method, a material that absorbs laser light and generates heat may be selected as the substrate. For example, a conventional thermal transfer film containing a light absorption conversion agent such as carbon, or an absorption layer formed on the front surface and / or the back surface of a support is used.

[0018]

EXAMPLES Next, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples. Further, the amounts (parts) of the respective components shown in Examples and Comparative Examples are all parts by weight.

Example 1 An aromatic polyamide film having a thickness of about 1 μm and having a heat-resistant layer of silicone resin on the back side was formed on an aromatic polyamide film having a thickness of about 6 μm by using a wire bar so that the thickness after drying was about 1 μm. Was coated with an intermediate adhesive layer. (Intermediate layer adhesive layer forming liquid) Polyvinyl butyral resin 10 parts (Sekisui Chemical Co., Ltd. BX-1) Diisocyanate 5 parts (Nippon Polyurethane Co., Ltd. Coronate) Methyl ethyl ketone 185 parts Further, an ink layer having the following formulation was prepared using a screen mesh # 350. Then, the ink layer forming liquid was applied by screen printing so that the thickness after drying was about 5 μm. (Dye supply layer forming liquid) Polyvinyl butyral resin 7 parts (Sekisui Chemical Co., Ltd. BX-1) Diisocyanate 5 parts (Nippon Polyurethane Co., Ltd. Coronate) Forou Brilliant Blue SR 30 parts 2-Ethylbutanol 150 parts Dispersion was carried out by a ball mill for 72 hours. It was Further, a low-dyeing resin layer having the following formulation was coated on the ink layer using a wire bar so that the thickness after drying was 0.5 μm to prepare a sublimation type thermal transfer member. (Low dyeing resin layer forming liquid) Dissolve 15 g of dimethoxysilane and 9 g of methyltrimethoxysilane in a mixed liquid of 12 g of toluene and 12 g of methyl ethyl ketone, and add 13 ml of 3% sulfuric acid.
Was added for hydrolysis for 3 hours. This liquid is referred to as Liquid A. Styrene-maleic acid copolymer 5 parts (Suprapearl AP30 manufactured by BASF) Liquid A 20 parts Ethanol 20 parts

Examples 2 and 3 In Example 1, sublimation type thermal transfer members were prepared by changing the ball mill dispersion time of the dye supply layer forming liquid to 24 and 48 hours.

Example 4 The ink supply layer forming liquid of Example 1 was replaced with the following formulation to form an ink layer by screen printing using a screen mesh # 350 so that the thickness after drying would be about 4 μm. The liquid was applied. (Dye supply layer forming liquid) Polyvinyl butyral resin 7 parts (Sekisui Chemical Co., Ltd. BX-1) Diisocyanate 5 parts (Nippon Polyurethane Co., Ltd. Coronate) Forou Brilliant Blue SR 20 parts Cyclohexanone 150 parts

Example 5 In Example 1, a solution for forming a dye transfer contributing layer having the following formulation was dried between the ink layer and the low dyeing resin layer having the following formulation using a wire bar to have a thickness of about 0. It was coated so as to have a thickness of 5 μm. (Dye transfer contributing layer forming liquid) Polyvinyl butyral resin 10 parts (Sekisui Chemical Co., Ltd. BX-1) Polyethylene oxide resin 3 parts Diisocyanate 5 parts (Nippon Polyurethane Co., Ltd.) n-butanol 160 parts

Examples 6, 7 and 8 In Example 5, sublimation type thermal transfer members were prepared by replacing the screen mesh size of the dye supplying layer printing conditions with # 200, # 230 and # 400.

Examples 9 and 10 In Example 5, the thickness of the dye supply layer was 2 μm and 3 respectively.
A sublimation type thermal transfer member was prepared in the same manner as in Example 5 except for the above.

Examples 11 and 12 In Example 5, the amount of 2-ethylbutanol in the dye supply liquid was changed to 110 parts and 86 parts, respectively, and the ink layer was dried by screen printing using a screen mesh # 350. The ink layer forming liquid was applied so that the thickness was about 5 μm. A sublimation type thermal transfer member was prepared in the same manner as in Example 5 except for the above.

Comparative Examples 1, 2 and 3 In Example 5, sublimation type thermal transfer members were prepared by changing the solvent of the dye supplying layer as shown in Table 1.

[0027]

[Table 1]

Comparative Examples 4 and 5 In Example 5, sublimation type thermal transfer members were prepared by substituting the screen mesh size of the dye supply layer with # 165 and # 180, respectively.

Examples 6 and 7 In Example 5, the amount of 2-ethylbutanol in the dye supplying layer liquid was changed to 75 parts and 68 parts, respectively, and the ink layer was screen-printed using screen mesh # 350. The layer forming liquid was applied. A sublimation type thermal transfer member was prepared in the same manner as in Example 5 except for the above.

[Preparation of Image Receptor] On a synthetic paper (Yupo FP-150 manufactured by Oji Yuka Synthetic Paper Co., Ltd.) having a thickness of about 150 μm, an intermediate layer and an image receiving layer coating solution having the following compositions were sequentially coated, and the drying temperature was 75 ° C.
And dried for 1 minute to form an intermediate layer and an image receiving layer. Then, it was stored at 60 ° C. for 24 hours and cured to prepare a test image receptor. (Intermediate layer forming liquid) Vinyl chloride vinyl acetate vinyl alcohol copolymer 10 parts (Union Carbide VAGH) Diisocyanate 5 parts (Nippon Polyurethane Co., Ltd. Coronate L) Toluene 40 parts Methyl etimeketone 40 parts (Image receiving layer coating liquid) ) Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 10 parts (Union Carbide VAGH) Diisocyanate 5 parts (Nippon Polyurethane Polyurethane Coronate L) Amino-modified silicone resin 0.5 parts (Toray Dow Corning SF8417) Epoxy Modified silicone resin 0.5 parts (Toray Dow Corning) Toluene 40 parts Methyl ethyl ketone 40 parts

Using this test image receptor, the sublimation type thermal transfer members obtained in the respective examples and comparative examples were tested under the following conditions. Table 3 shows the results. Printing (printing conditions) Thermal head resolution 12 dots / mm Applied energy 0.64 mj / dot Applied voltage 0.16 W / dot Thermal head pressure 5 kgf / cm ² (Feeding speed during recording)

[Table 2]

(Surface shape measurement condition) Measuring instrument: Tokyo Seimitsu MD-S75A Measurement direction Sub-scanning direction during printing Calculation method Obtain the average value of 10 measurements. Round off the third digit after the decimal point. Image uniformity (visual inspection) The image rank was determined and evaluated as follows. Rank 5: No image unevenness 2: Strong overall, Rank 4: Partial weakness 1: Missing dots Rank 3: Overall weakness

[Table 3]

[0033]

【The invention's effect】

(1) The sublimation-type thermal transfer member according to claim 1 has good image quality by setting the maximum filtered wave waviness WGM of the surface to 2.0 μm. (2) The sublimation type thermal transfer member according to claim 2 is excellent in multi-performance (high n-fold printing is possible) because the ink layer in the thermal transfer member according to claim 1 is an ink layer containing a particulate sublimation dye, Gives an image without unevenness in image density. (3) The sublimation type thermal transfer member according to claim 3 or 6 is the same as the thermal transfer member according to claim 1, wherein the ribbon is formed face-sequentially, and further, the narrow width face sequential is enabled by the screen printing method to reduce the running cost. It is a thing. (4) The sublimation-type thermal transfer member according to claim 4 provides a transferred image having no image density unevenness by setting the surface roughness of the center line average roughness: 0.5 μm or less in the thermal transfer member according to claim 1. (5) The sublimation type thermal transfer member according to claim 5 is the same as the thermal transfer member according to claim 2, wherein the ink layer has a thickness of 3 μm or more to provide an image without image unevenness and is excellent in mulching ability. is there. (6) The sublimation-type thermal transfer member according to claim 7 is the thermal transfer member according to claim 1, wherein a transfer image having higher quality and more uniform image quality can be obtained by specifying the relationship between the maximum waviness of the filtered wave and the scanning direction during recording. give. (7) The sublimation type thermal transfer member according to claim 8 gives a good image that can satisfy claim 1. (8) The sublimation type thermal transfer member according to claim 9 gives a good image that can satisfy claim 1.

[Brief description of drawings]

FIG. 1 is an explanatory view of a thermal transfer method using a sublimation type thermal transfer member of the present invention.

FIG. 2 is an explanatory view of a method for measuring the maximum waviness of filtered waves and the surface roughness of the center line according to the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location 7416-2H B41M 5/26 101 J 7416-2H 101 L (72) Inventor Shinya Kawahara Ota Ward, Tokyo Nakamagome 1-3-6, Ricoh Co., Ltd.

Claims (9)

[Claims] 1. A running speed of 1 / n (n>
In the sublimation type thermal transfer body capable of transferring in 1), the maximum waviness of filtered surface: WCM (μm) has a relationship of the following equation: WCM (μm) ≦ 2.0 2. The sublimation type thermal transfer member according to claim 1, further comprising an ink layer containing a particulate sublimation dye. 3. The sublimation type thermal transfer member according to claim 1, wherein the ink layer forming the ribbon is frame-sequential. 4. The sublimation type thermal transfer member according to claim 1, wherein the center line surface roughness is Ra ≦ 0.5 μm. 5. The sublimation type thermal transfer member according to claim 1, wherein the thickness of the ink layer is 3 μm or more. 6. The sublimation-type thermal transfer member according to claim 1, wherein the maximum waviness of filtered light in the sub-scanning direction: WCM (μm) has the following expression. WCM (μm) ≦ 1.5 7. The method for producing a sublimation type thermal transfer member according to claim 1, wherein the ink layer is applied by a screen printing method. 8. The method for producing a sublimation-type thermal transfer member according to claim 7, wherein the mesh size of the screen mesh used in the screen printing is # 200 or more. 9. The shear rate of the ink coating liquid is 3.8 (1 /
The sublimation type thermal transfer member according to claim 7, wherein the liquid viscosity in s) is 30 Pa · s or less (25 ° C).