JP2014223730A - Cleaning sheet for thermal head - Google Patents

Cleaning sheet for thermal head Download PDF

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JP2014223730A
JP2014223730A JP2013102949A JP2013102949A JP2014223730A JP 2014223730 A JP2014223730 A JP 2014223730A JP 2013102949 A JP2013102949 A JP 2013102949A JP 2013102949 A JP2013102949 A JP 2013102949A JP 2014223730 A JP2014223730 A JP 2014223730A
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thermal head
filler
thermal transfer
thermal
cleaning sheet
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JP6136560B2 (en
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淳之 大嶋
Atsuyuki Oshima
淳之 大嶋
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Toppan Inc
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Toppan Printing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a cleaning sheet for a thermal head, capable of removing adhered substances fixed by heat to a thermal head, reducing wear of the thermal head due to the cleaning sheet, and avoiding deterioration of print quality.SOLUTION: A cleaning sheet 10 for a thermal head is intended to remove adhered substances on a thermal head of a thermal transfer printer. The thermal transfer printer uses: a thermal transfer medium having a coloring-donor layer configured to be printed or transferred by applying heat to a sheet substrate of the thermal transfer medium; and a thermal transfer image-receiving material having an image receiving layer configured to receive a coloring material by applying heat to the sheet substrate. In the thermal transfer printer, heating is performed by a thermal head according to an image signal, so as to record an image on the thermal transfer image-receiving material. In the cleaning sheet 10 for a thermal head, a polishing layer 1 is formed on a sheet substrate 2, a filler included in the polishing layer uses a mixture of: a high hardness filler having Mohs hardness 7 or higher; and a low hardness filler having Mohs hardness 1-3, and a mix proportion of the low hardness filler to a total filler is 20-80 mass%.

Description

本発明は熱転写記録に用いられる熱転写プリンターのサーマルヘッド用クリーニングテープに関するものである。   The present invention relates to a cleaning tape for a thermal head of a thermal transfer printer used for thermal transfer recording.

デジタルカメラ等で得られたデジタル情報からプリントを得る方法として、熱転写システムが多く用いられている。プリントを得るためには、3原色に分解された色毎の画素情報に合わせ、マゼンタ着色材、シアン着色材、イエロー着色材、黒色着色材がパートコートされた熱転写媒体から、サーマルヘッドを用いて、色成分毎に被転写受像媒体に熱転写する方式がある。   As a method for obtaining a print from digital information obtained by a digital camera or the like, a thermal transfer system is often used. To obtain a print, a thermal head is used from a thermal transfer medium that is part-coated with a magenta colorant, a cyan colorant, a yellow colorant, and a black colorant in accordance with pixel information for each color separated into three primary colors. There is a system in which each color component is thermally transferred to a transfer image receiving medium.

この時、サーマルプリンターはサーマルヘッドが常にフィルムバックコート面と接触しており、サーマルヘッドとフィルムバックコートが擦れ、バックコート成分がサーマルヘッドに付着・固着してしまうことで、印画品質の低下の原因となっている。   At this time, in the thermal printer, the thermal head is always in contact with the film back coat surface, the thermal head and the film back coat are rubbed, and the back coat components adhere to and adhere to the thermal head. It is the cause.

サーマルヘッドへの付着物は、熱により固着しており、研磨除去する必要が有り、研磨除去を目的とし、高硬度のフィラーを添加して、研磨性能を高めたサーマルヘッド用クリーニングテープが提案されているが、サーマルヘッド自体を磨耗させてしまう(特許文献1)。   Deposits on the thermal head are fixed by heat and need to be removed by polishing. For the purpose of polishing removal, a high-hardness filler is added to improve the polishing performance. However, the thermal head itself is worn (Patent Document 1).

固着した異物を除去するためのフィラーとしてシリカを用いることが多いが、シリカはモース硬度が7と硬いためにサーマルヘッドをも磨耗させてしまうため、印画品質の低下原因となってしまう。   Silica is often used as a filler for removing the adhered foreign matter, but since silica has a Mohs hardness as high as 7, it also wears the thermal head, causing a reduction in print quality.

サーマルヘッドの磨耗を減少させるために、低硬度のフィラーを添加すると、付着物を除去することができず、付着物除去とサーマルヘッドの磨耗低減とを両立させることは非常に困難である。   If a low-hardness filler is added to reduce the wear of the thermal head, the deposit cannot be removed, and it is very difficult to achieve both the removal of the deposit and the reduction of the wear of the thermal head.

特開平5‐116428号公報JP-A-5-116428

熱により固着したサーマルヘッドへの付着物を着実に除去することができ、さらに問題となるクリーニングシートによるサーマルヘッドの磨耗を低減させ、印画品質の低下を起きないサーマルヘッド用クリーニングシートを提供することにある。   To provide a thermal head cleaning sheet that can steadily remove deposits on the thermal head fixed by heat, reduce thermal head wear due to a problematic cleaning sheet, and cause no degradation in print quality. It is in.

上記の課題を解決するための手段として、請求項1に記載の発明は、サーマルヘッドにより画像信号に応じた加熱を行ない、熱転写受像材料に画像を記録するための熱転写プリンターの、サーマルヘッドに付着する付着物を除去するためのサーマルヘッド用クリーニングシートであって、
シート基材に研磨層を設け、研磨層に含有するフィラーにモース硬度7以上の高硬度フィラーとモース硬度が1以上3以下の低硬度フィラーの混合を用い、総フィラーに対する低硬度フィラー配合比が20〜80質量%としたことを特徴とするサーマルヘッド用クリーニングシートである。
As a means for solving the above problems, the invention described in claim 1 is attached to a thermal head of a thermal transfer printer for performing heating according to an image signal by a thermal head and recording an image on a thermal transfer image receiving material. A thermal head cleaning sheet for removing deposits
A polishing layer is provided on the sheet base material, and a mixture of a high hardness filler having a Mohs hardness of 7 or more and a low hardness filler having a Mohs hardness of 1 to 3 is used as the filler contained in the polishing layer, and the ratio of the low hardness filler to the total filler is It is a cleaning sheet for a thermal head, characterized by being 20 to 80% by mass.

また、請求項2に記載の発明は、前記高硬度フィラーが平均粒径2μmのシリカで、前記低硬度フィラーが平均粒径2μmの炭酸カルシウムであることを特徴とする請求項1に記載のサーマルヘッド用クリーニングシートである。   The invention according to claim 2 is characterized in that the high hardness filler is silica having an average particle diameter of 2 μm, and the low hardness filler is calcium carbonate having an average particle diameter of 2 μm. This is a head cleaning sheet.

本願発明のサーマルヘッド用クリーニングシートを用いることにより、クリーニング能力の低下が無く、サーマルヘッドに付着する異物を着実に除去することができ、従来問題となっていたサーマルヘッドの磨耗を抑え、印画品質の低下を無くすことができる。   By using the thermal head cleaning sheet of the present invention, it is possible to steadily remove foreign matter adhering to the thermal head without deteriorating the cleaning capability, suppressing the thermal head wear, which has been a problem in the past, and printing quality. Can be eliminated.

本願発明のサーマルヘッド用クリーニングシートの断面を示した概念図である。It is the conceptual diagram which showed the cross section of the cleaning sheet for thermal heads of this invention. サーマルヘッドの加熱により、熱転写媒体から熱転写受像材料に画像を記録する機構を示した概念図である。It is a conceptual diagram showing a mechanism for recording an image from a thermal transfer medium onto a thermal transfer image receiving material by heating of a thermal head. 熱転写媒体を示した概念図である。It is the conceptual diagram which showed the thermal transfer medium. サーマルヘッドの加熱により、熱転写媒体から熱転写受像材料に画像を記録する機構及びサーマルヘッドのクリーニング機構を示した概念図である。FIG. 5 is a conceptual diagram showing a mechanism for recording an image from a thermal transfer medium onto a thermal transfer image receiving material and a thermal head cleaning mechanism by heating the thermal head.

以下本発明を実施するための形態を、図面を用いて詳細に説明する。図1は本願発明のサーマルヘッド用クリーニングシートを示した断面図であり、シート基材2に研磨層1が設けられており、この研磨層1に含有される研磨材として、モース硬度が7以上の高硬度フィラーとモース硬度が1以上3以下の低硬度フィラーを混合して用いている。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a cleaning sheet for a thermal head according to the present invention. A polishing layer 1 is provided on a sheet base material 2, and the Mohs hardness is 7 or more as an abrasive contained in the polishing layer 1. A high-hardness filler and a low-hardness filler having a Mohs hardness of 1 to 3 are used.

図2は、熱転写媒体から熱転写受像媒体に画像を記録させた状態を示しており、サーマルヘッド13が熱転写媒体の基材裏面のバックコート層5と常に接触し、サーマルヘッド13とバックコート層が擦れ、バックコート層5の成分がサーマルヘッド13に付着・固着することで印画品質の低下の原因となる。
図3は、熱転写媒体11を示しており、一般的には、カラー画像を記録する場合には、マゼンタ着色材6、シアン着色材7、イエロー着色材8、黒着色材9がパートコートされており、マゼンタ画像、シアン画像、イエロー画像、黒画像の順に印字され、文字情報の場合には、黒着色材9のみがコートされた熱転写媒体が用いられる。
FIG. 2 shows a state in which an image is recorded from the thermal transfer medium to the thermal transfer image receiving medium. The thermal head 13 is always in contact with the backcoat layer 5 on the back surface of the substrate of the thermal transfer medium, and the thermal head 13 and the backcoat layer are The components of the back coat layer 5 are rubbed and adhered to and adhered to the thermal head 13, which causes a decrease in print quality.
FIG. 3 shows a thermal transfer medium 11. In general, when a color image is recorded, a magenta coloring material 6, a cyan coloring material 7, a yellow coloring material 8, and a black coloring material 9 are part-coated. Thus, a magenta image, a cyan image, a yellow image, and a black image are printed in this order, and in the case of character information, a thermal transfer medium coated only with the black coloring material 9 is used.

図4は、サーマルヘッド13の加熱により、熱転写媒体11から熱転写受像媒体12に画像を記録する機構及びサーマルヘッド13のクリーニング機構を示しており、画像印字の場合は、熱転写媒体11が用いられ、サーマルヘッド13をクリーニングする場合には、サーマルヘッド用クリーニングしーと10が用いられ、一般的にはカセットの交換により、印字とクリーニングを切り替えることができる。   FIG. 4 shows a mechanism for recording an image from the thermal transfer medium 11 to the thermal transfer image receiving medium 12 by heating the thermal head 13 and a cleaning mechanism for the thermal head 13. In the case of image printing, the thermal transfer medium 11 is used. When the thermal head 13 is cleaned, the thermal head cleaning element 10 is used. Generally, printing and cleaning can be switched by replacing the cassette.

研磨層1は、樹脂溶液に、フィラーと界面活性剤や必要に応じて、硬化剤、静電気防止剤等を添加し、混練して調製した塗液を、基材に塗布、乾燥固化させて形成される。   The polishing layer 1 is formed by applying a coating solution prepared by adding a filler, a surfactant, and, if necessary, a curing agent, an antistatic agent, etc. to a resin solution and kneading and drying and solidifying it. Is done.

フィラーとしては、シリカを用いることが多いが、シリカはモース硬度が7と硬いため、クリーニングの操作時に、サーマルヘッド13を研磨してしまい、サーマルへッド先端の形状を変化させてしまい、印字品質の低下をもたらしてしまう。   Silica is often used as the filler, but since silica has a Mohs hardness of 7, the thermal head 13 is polished during the cleaning operation, changing the shape of the thermal head tip, and printing. This will result in quality degradation.

種々検討を行った結果、モース硬度が1以上3以下のフィラーを添加することで、サーマルヘッド13に付着・固着してしまった異物の除去機能を落とさずに、しかも、サーマルヘッド13の磨耗を低減させることができることを見出した。   As a result of various investigations, by adding a filler having a Mohs hardness of 1 or more and 3 or less, the function of removing foreign matter adhered to and adhered to the thermal head 13 is not degraded, and the thermal head 13 is worn away. It was found that it can be reduced.

以下、実施例、比較例を基に、本願発明の効果について説明する。   Hereinafter, based on an Example and a comparative example, the effect of this invention is demonstrated.

フィラーとしてモー硬度が7の高硬化フィラーであるシリカと、モース硬度が2の低硬度フィラーである炭酸カルシウムを用いた研磨層塗液を以下の比率にて調製した。
ポリエステル樹脂(東洋紡社製バイロン30) 60質量部リン酸エステル系界面活性剤(第一工業製薬社製プライサーフA208 2質量部シリカ(平均粒系2μm) 8質量部炭酸カルシウム(平均粒系2μm) 2質量部メチルエチルケトン 14質量部トルエン 14質量部を、混連塗液化し、12μmの厚みのPETフィルム基材に塗布し、加熱乾燥により1μmの厚みの研磨層1を持つ第1のサーマルヘッド用クリーニングシート10を得た。
A polishing layer coating solution using silica as a high-hardness filler having a Moh hardness of 7 and calcium carbonate as a low-hardness filler having a Mohs hardness of 2 as fillers was prepared at the following ratio.
Polyester resin (byron 30 manufactured by Toyobo Co., Ltd.) 60 parts by mass Phosphate ester surfactant (Pricesurf A208 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 2 parts by mass silica (average particle size 2 μm) 8 parts by mass calcium carbonate (average particle size 2 μm) 2 parts by mass Methyl ethyl ketone 14 parts by mass Toluene 14 parts by mass is applied to a PET film substrate having a thickness of 12 μm, and is heated and dried to have a polishing layer 1 having a thickness of 1 μm. Sheet 10 was obtained.

同様に、フィラーとしてモー硬度が7の高硬化フィラーであるシリカと、モース硬度が2の低硬度フィラーである炭酸カルシウムを用いた研磨層塗液を以下の比率にて調製した。
ポリエステル樹脂(東洋紡社製バイロン30) 60質量部リン酸エステル系界面活性剤(第一工業製薬社製プライサーフA208 2質量部シリカ(平均粒系2μm) 5質量部炭酸カルシウム(平均粒系2μm) 5質量部メチルエチルケトン 14質量部トルエン 14質量部を、混連塗液化し、12μmの厚みのPETフィルム基材に塗布し、加熱乾燥により1μmの厚みの研磨層1を持つ第2のサーマルヘッド用クリーニングシート10を得た。
Similarly, a polishing layer coating solution using silica as a high-hardening filler with a Moh hardness of 7 and calcium carbonate as a low-hardness filler with a Mohs hardness of 2 was prepared in the following ratio.
Polyester resin (Byron 30 manufactured by Toyobo Co., Ltd.) 60 parts by mass Phosphate ester surfactant (Pricesurf A208 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 2 parts by mass silica (average particle size 2 μm) 5 parts by mass calcium carbonate (average particle size 2 μm) 5 parts by mass methyl ethyl ketone 14 parts by mass Toluene 14 parts by mass is applied to a PET film substrate having a thickness of 12 μm, and is heated and dried to have a polishing layer 1 having a thickness of 1 μm. Sheet 10 was obtained.

同様に、フィラーとしてモー硬度が7の高硬化フィラーであるシリカと、モース硬度が2の低硬度フィラーである炭酸カルシウムを用いた研磨層塗液を以下の比率にて調製した。
ポリエステル樹脂(東洋紡社製バイロン30) 60質量部リン酸エステル系界面活性剤(第一工業製薬社製プライサーフA208 2質量部シリカ(平均粒系2μm) 2質量部炭酸カルシウム(平均粒系2μm) 8質量部メチルエチルケトン 14質量部トルエン 14質量部を、混連塗液化し、12μmの厚みのPETフィルム基材に塗布し、加熱乾燥により1μmの厚みの研磨層1を持つ第3のサーマルヘッド用クリーニングシート10を得た。
Similarly, a polishing layer coating solution using silica as a high-hardening filler with a Moh hardness of 7 and calcium carbonate as a low-hardness filler with a Mohs hardness of 2 was prepared in the following ratio.
Polyester resin (Byron 30 manufactured by Toyobo Co., Ltd.) 60 parts by mass Phosphate-based surfactant (Pricesurf A208 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 2 parts by mass silica (average particle size 2 μm) 2 parts by mass calcium carbonate (average particle size 2 μm) 8 parts by mass Methyl ethyl ketone 14 parts by mass Toluene 14 parts by mass is applied to a PET film substrate having a thickness of 12 μm and is heated and dried to have a polishing layer 1 having a thickness of 1 μm. Sheet 10 was obtained.

<比較例1>
比較例として、従来より用いられている高硬度フィラーであるシリカのみを用いた研磨層塗布液を以下の比率にて調整した。
ポリエステル樹脂(東洋紡社製バイロン30) 60質量部リン酸エステル系界面活性剤(第一工業製薬社製プライサーフA208 2質量部シリカ(平均粒系2μm) 10質量部メチルエチルケトン 14質量部トルエン 14質量部を、混連塗液化し、12μmの厚みのPETフィルム基材に塗布し、加熱乾燥により1μmの厚みの研磨層1を持つ第4のサーマルヘッド用クリーニングシート10を得た。
<Comparative Example 1>
As a comparative example, a polishing layer coating solution using only silica, which is a conventionally used high hardness filler, was adjusted at the following ratio.
Polyester resin (Byron 30 manufactured by Toyobo Co., Ltd.) 60 parts by mass Phosphate ester surfactant (Pricesurf A208 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 2 parts by mass Silica (average particle size 2 μm) 10 parts by mass Methyl ethyl ketone 14 parts by mass Toluene 14 parts by mass Was formed into a mixed coating solution, applied to a PET film substrate having a thickness of 12 μm, and heat drying to obtain a fourth thermal head cleaning sheet 10 having a polishing layer 1 having a thickness of 1 μm.

<比較例2>
比較例として、高硬度フィラーを用いずに、低硬度フィラーである炭酸カルシウムのみを用いた研磨層塗液を以下の比率で調製した。
ポリエステル樹脂(東洋紡社製バイロン30) 60質量部リン酸エステル系界面活性剤(第一工業製薬社製プライサーフA208 2質量部炭酸カルシウム(平均粒系2μm) 10質量部メチルエチルケトン 14質量部トルエン 14質量部を、混連塗液化し、12μmの厚みのPETフィルム基材に塗布し、加熱乾燥により1μmの厚みの研磨層1を持つ第5のサーマルヘッド用クリーニングシート10を得た。
<Comparative example 2>
As a comparative example, a polishing layer coating solution using only calcium carbonate, which is a low hardness filler, was prepared at the following ratio without using a high hardness filler.
Polyester resin (Byron 30 manufactured by Toyobo Co., Ltd.) 60 parts by mass Phosphate ester surfactant (Price Surf A208, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 2 parts by mass Calcium carbonate (average particle size 2 μm) 10 parts by mass Methyl ethyl ketone 14 parts by mass Toluene 14 masses The part was mixed and mixed and applied to a PET film substrate having a thickness of 12 μm, and a fifth thermal head cleaning sheet 10 having a polishing layer 1 having a thickness of 1 μm was obtained by heat drying.

<評価>
上記組成にて得られた5種類のサーマルヘッド用クリーニングシートを用い、サーマルヘッドへの付着物の除去具合と、サーマルヘッド磨耗量の測定を行った。
<Evaluation>
Using the five types of thermal head cleaning sheets obtained with the above composition, the degree of deposit removal on the thermal head and the amount of thermal head wear were measured.

確認方法としては連続多数枚印画を行い、サーマルヘッドへ付着物を付着させ、カスの除去度合いは、目視確認にて行い、磨耗量はレーザー顕微鏡にて、前後の形状のを確認し変化量を測定をおこない、その結果を表1に示した。   As a confirmation method, print a large number of sheets continuously, adhere deposits to the thermal head, visually check the degree of residue removal, and check the amount of wear by checking the shape of the front and back with a laser microscope. Measurements were performed and the results are shown in Table 1.

Figure 2014223730
高硬度フィラーであるシリカと低硬度フィラーである炭酸カルシウムを混合した実施例ではサーマルヘッドの磨耗は見られず、付着物除去との両立が可能であった。一方、高硬度フィラーであるシリカ単体を用いた比較例1は磨耗量が多く、低硬度フィラーである炭酸カルシウム単体では付着物の除去が不足していた。
Figure 2014223730
In the example in which silica, which is a high hardness filler, and calcium carbonate, which is a low hardness filler, were mixed, the thermal head was not worn, and it was possible to achieve both adhesion removal. On the other hand, Comparative Example 1 using silica alone, which is a high-hardness filler, has a large amount of wear, and calcium carbonate alone, which is a low-hardness filler, has insufficient removal of deposits.

1・・・研磨層
2・・・シート基材
3・・・着色材
4・・・受像層
5・・・バックコート層
6・・・赤着色材
7・・・緑着色材
8・・・青着色材
9・・・黒着色材
10・・・サーマルヘッド用クリーニングシート
11・・・熱転写媒体
12・・・熱転写受像媒体
13・・・サーマルヘッド
DESCRIPTION OF SYMBOLS 1 ... Polishing layer 2 ... Sheet base material 3 ... Colorant 4 ... Image receiving layer 5 ... Backcoat layer 6 ... Red colorant 7 ... Green colorant 8 ... Blue coloring material 9 ... Black coloring material 10 ... Thermal head cleaning sheet 11 ... Thermal transfer medium 12 ... Thermal transfer image receiving medium 13 ... Thermal head

Claims (2)

サーマルヘッドにより画像信号に応じた加熱を行ない、熱転写受像材料に画像を記録するための熱転写プリンターの、サーマルヘッドに付着する付着物を除去するためのサーマルヘッド用クリーニングシートであって、
シート基材に研磨層を設け、研磨層に含有するフィラーにモース硬度7以上の高硬度フィラーとモース硬度が1以上3以下の低硬度フィラーの混合を用い、総フィラーに対する低硬度フィラー配合比が20〜80質量%としたことを特徴とするサーマルヘッド用クリーニングシート。
A thermal head cleaning sheet for removing deposits adhering to a thermal head of a thermal transfer printer for recording an image on a thermal transfer image receiving material by heating according to an image signal by a thermal head,
A polishing layer is provided on the sheet base material, and a mixture of a high hardness filler having a Mohs hardness of 7 or more and a low hardness filler having a Mohs hardness of 1 to 3 is used as the filler contained in the polishing layer, and the ratio of the low hardness filler to the total filler is A cleaning sheet for a thermal head, characterized by being 20 to 80% by mass.
前記高硬度フィラーが平均粒径2μmのシリカで、前記低硬度フィラーが平均粒径2μmの炭酸カルシウムであることを特徴とする請求項1に記載のサーマルヘッド用クリーニングシート。   2. The thermal head cleaning sheet according to claim 1, wherein the high hardness filler is silica having an average particle diameter of 2 [mu] m, and the low hardness filler is calcium carbonate having an average particle diameter of 2 [mu] m.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05116428A (en) * 1991-10-25 1993-05-14 Fuji Photo Film Co Ltd Cleaning tape for thermal head
JPH05139003A (en) * 1991-11-20 1993-06-08 Hitachi Maxell Ltd Thermal transfer recording medium and recording device thereof
JPH079774A (en) * 1993-06-09 1995-01-13 Agfa Gevaert Nv Heat-resistant layer for dye donor material
JPH10100454A (en) * 1996-10-02 1998-04-21 Dainippon Printing Co Ltd Cleaning ribbon and cleaning method
JP2003025741A (en) * 2001-07-10 2003-01-29 Ricoh Co Ltd Sublimation type heat transfer recording method and device, and heat transfer sheet useful therefor
JP2006306016A (en) * 2004-09-30 2006-11-09 Dainippon Printing Co Ltd Thermal transfer sheet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05116428A (en) * 1991-10-25 1993-05-14 Fuji Photo Film Co Ltd Cleaning tape for thermal head
JPH05139003A (en) * 1991-11-20 1993-06-08 Hitachi Maxell Ltd Thermal transfer recording medium and recording device thereof
JPH079774A (en) * 1993-06-09 1995-01-13 Agfa Gevaert Nv Heat-resistant layer for dye donor material
JPH10100454A (en) * 1996-10-02 1998-04-21 Dainippon Printing Co Ltd Cleaning ribbon and cleaning method
JP2003025741A (en) * 2001-07-10 2003-01-29 Ricoh Co Ltd Sublimation type heat transfer recording method and device, and heat transfer sheet useful therefor
JP2006306016A (en) * 2004-09-30 2006-11-09 Dainippon Printing Co Ltd Thermal transfer sheet

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