JPS61284488A - Thermal copy method - Google Patents

Thermal copy method

Info

Publication number
JPS61284488A
JPS61284488A JP60125135A JP12513585A JPS61284488A JP S61284488 A JPS61284488 A JP S61284488A JP 60125135 A JP60125135 A JP 60125135A JP 12513585 A JP12513585 A JP 12513585A JP S61284488 A JPS61284488 A JP S61284488A
Authority
JP
Japan
Prior art keywords
dye
image
sheet
layer
intermediate sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP60125135A
Other languages
Japanese (ja)
Inventor
Yoshihiko Hotta
吉彦 堀田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP60125135A priority Critical patent/JPS61284488A/en
Publication of JPS61284488A publication Critical patent/JPS61284488A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382Contact thermal transfer or sublimation processes
    • B41M5/38257Contact thermal transfer or sublimation processes characterised by the use of an intermediate receptor

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

PURPOSE:To provide a thermal copy method capable of obtaining a large number of sharp copy sheets, in a thermal copy method wherein an image is drawn on a transfer sheet provided with a dye layer containing a sublimable or evaporative dye by the solvent capable of dissolving the dye layer to be transferred to an intermediate sheet to form an original having a reverse image and the reverse-image forming surface of the original is superposed to a receiving sheet under heating to obtain a dye image, by providing a porous layer as the intermediate sheet. CONSTITUTION:As the sublimable or evaporative dye constituting a transfer sheet, all of a disperse dye, an oil-soluble dye, a mordant dye, a vat dye and a basic dye etc. can be used. An intermediate sheet is formed by providing a porous layer containing an org. and/or inorg. filler and a resin as main components to the surface of paper or a resin film. A positive image is drawn on the dye layer of the transfer sheet with water or an org. solvent and, subsequently, the softened or melted dye layer forming substance is transferred to the porous layer of the intermediate sheet as a reverse image. When the reverse image is superposed to a receiving sheet heating, only the dye is sublimed and evaporated to form a positive dye image on the receiving sheet.

Description

【発明の詳細な説明】 〔技術分野〕 本発明は感熱複写方法に関し、詳しくは、昇華法又は気
化性染料を用いて多数枚コピーが得られるようにした感
熱昇華複写方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a thermal copying method, and more particularly to a thermosensitive sublimation copying method that allows a large number of copies to be obtained using a sublimation method or a vaporizable dye.

〔従来技術〕[Prior art]

昇華法又は気化性染料を利用しての感熱複写方法は従来
よりなされており、代表的なものとして、昇華法又は気
化性染料を含有する染料層を設けた転写シートと中間シ
ートとを重ね、加圧して前記染料層を逆像状に中間シー
ト上に転写し、次いで、これに受容シートを重ね加熱し
正向きの染料画像を受容シートに形成する方式%式% しかし、上記方式においては、多数枚コピーができるほ
どの付着量の染料層組成物を転写シートから中間シート
へ練圧程度で転写させることは困−である。もつとも、
筆圧を高めて前記付着量を増大させ、そ・れlこよって
より多数コe−を作成することも考えられるが、そうし
た手段によっても期待できるだけの付着転写量は得られ
ないのが実情である。
Thermal copying methods using the sublimation method or vaporizable dyes have been used in the past, and a typical method involves laminating a transfer sheet provided with a dye layer containing a sublimation method or vaporizable dye and an intermediate sheet. However, in the above method, the dye layer is transferred onto an intermediate sheet in a reverse image form by applying pressure, and then a receiving sheet is placed on top of this and heated to form a dye image in the forward direction on the receiving sheet. It is difficult to transfer a sufficient amount of the dye layer composition from the transfer sheet to the intermediate sheet using kneading pressure to make multiple copies. However,
It is conceivable to increase the amount of adhesion by increasing the writing pressure, thereby creating a larger number of copies, but the reality is that even with such a method, the expected amount of adhesion and transfer cannot be obtained. be.

こうしたことを考慮して、本発明者はさきに前記染料層
組成物の中間シートへの転写を加圧によるのではなく、
その染料層を溶剤等で選択的に軟化ないし溶解しこれを
中間シートに転写サセるようにすれば、染料層組成物の
付着量が多くなって多数枚コピーを得るの1こ効果的、
あることを確め提案した。だが、実際にはこれによって
も本発明者が意図したほどには鮮明な多数枚コピーが得
られないといった嫌いがある。
Taking these things into consideration, the present inventor first transferred the dye layer composition to the intermediate sheet by applying pressure instead of transferring it to the intermediate sheet.
If the dye layer is selectively softened or dissolved with a solvent or the like and transferred to the intermediate sheet, the amount of the dye layer composition adhered will increase, making it more effective to obtain multiple copies.
I confirmed this and made a suggestion. However, in reality, even with this method, many copies cannot be made as clearly as the inventor intended.

〔目 的〕〔the purpose〕

本発明は、上記提案した方法に改良を加えることで、鮮
明なコピーが多数枚得られる昇華法又は気化性染料を用
いた感熱複写方法を提供するものである。
The present invention provides a thermal copying method using a sublimation method or a vaporizable dye, which can produce a large number of clear copies by improving the method proposed above.

〔構 成〕〔composition〕

本発明は昇華法又は気化性染料を含む染料層が設けられ
た転写シートに該染料層を軟化ないし溶解しうる溶剤等
で画像を描いた後、これに中間シートを重ね該画像部分
を転写させ逆像とした原図を作成し、次いで、この原図
の逆像形成面と受容シートとを重ね合わせ加熱して該受
容シート上に染料画像を得る感熱複写方法において、該
中間シートとして逆像形成面側に多孔質層を設けたもの
が用いられることを特徴とする。
In the present invention, an image is drawn on a transfer sheet provided with a dye layer containing a vaporizable dye using a sublimation method or a solvent that can soften or dissolve the dye layer, and then an intermediate sheet is placed on top of this and the image portion is transferred. In a thermal copying method in which an original image is created as a reverse image, and then a dye image is formed on the receptor sheet by overlapping and heating the reverse image forming surface of this original image and heating the reverse image forming surface of the original image, the reverse image forming surface is used as the intermediate sheet. It is characterized in that a porous layer is provided on the side.

ちなみに、本発明者はさきに提案した感熱昇華複写方法
で用いられる材料等について改めて検討を行なった結果
、中間シートとして(1)通常の紙が用いられていると
軟化ないし溶解した染料層組成物がシート中に浸み込ん
でしまい、後の加熱による染料昇華が良好に行なえず、
また(1)樹脂フィルムが用いられていると加熱時に逆
像状の画像部分全体が溶融し受容シートに転写してしま
う、といったことが多数枚コピーを得るうえで不利であ
り、従って、中間シートとして表面(逆像形成面側)に
多孔質層を設けるようにしておけばそうした不測の事態
が生じないことを見出した。本発明はかかる知見に基づ
いて完成されたものである。
Incidentally, the present inventor conducted a new study on the materials used in the heat-sensitive sublimation copying method proposed earlier, and found that (1) the dye layer composition softened or dissolved when ordinary paper was used as the intermediate sheet; seeped into the sheet, and the dye sublimation by subsequent heating could not be carried out well.
In addition, (1) if a resin film is used, the entire inverted image part will melt and be transferred to the receiving sheet when heated, which is disadvantageous in making multiple copies; It has been found that if a porous layer is provided on the surface (on the reverse image forming surface side), such an unexpected situation will not occur. The present invention was completed based on this knowledge.

本発明では、まず支持体上に昇華法又は気化性の染料を
主成分とする染料層を投げた転写シート上に、染料層を
軟化ないし溶解させることのできる溶剤(有機溶剤、水
など)で画像を描き染料層のその部分だけ軟化ないし溶
解せしめ、これに中間シートの多孔質層面を重ね圧着す
ることによって、前記染料層の軟化ないし溶解した部分
のみを中間シート上に逆像として転写させる。続いて、
この逆像を有した中間シートを原図とし、この原図(逆
像のある面)と受容シー°トとを重ねて加熱することに
よって逆像中の昇華法又は気化性染料を受容シートに転
移させる。ここに受容シート上には正向きの染料画像が
形成される。
In the present invention, first, a dye layer containing a sublimation method or a vaporizable dye as a main component is deposited on a support, and then a solvent (organic solvent, water, etc.) that can soften or dissolve the dye layer is applied. By drawing an image and softening or dissolving only that part of the dye layer, and pressing the porous layer surface of the intermediate sheet over the image, only the softened or dissolved part of the dye layer is transferred onto the intermediate sheet as a reverse image. continue,
The intermediate sheet with this reverse image is used as the original image, and the original image (the side with the reverse image) and the receiving sheet are overlapped and heated to transfer the sublimation or vaporizable dye in the reverse image to the receiving sheet. . A positive dye image is now formed on the receiver sheet.

転写シートを構成する昇華法又は気化性染料には、この
分野で知られている分散染料、油溶染料、媒染々料、バ
ット染料、塩基性染料などのいずれもが使用できる。転
写シートはこれら染料を樹脂及び/又はワックスととも
に水又は有機溶媒中に混合溶解せしめたものを支持体(
好ましく樹脂フィルム)上に乾燥TL賃5〜209/r
rl程度tC塗工することlこより作製される。
As the sublimation or vaporizable dye constituting the transfer sheet, any of disperse dyes, oil-soluble dyes, mordant dyes, vat dyes, basic dyes, etc. known in this field can be used. Transfer sheets are made by dissolving these dyes together with resin and/or wax in water or an organic solvent as a support (
(preferably a resin film) with a dry TL charge of 5 to 209/r
It is produced by applying tC coating of about RL.

ここでの樹脂及び/又はワックスは0〜100℃くらい
の温度で軟化ないし溶融する性質のものが用いられ、樹
脂の代表例としてはテルペン系樹脂、ポリ塩化ビニル、
ポリプロピレン、Iリプチレン、ポリスチレン%ABS
、メタクリル戯系樹脂、ポリ酢酸ビニル、ポリカーボネ
ート1セルロース、ポリエステル樹脂又はこれらのモノ
マーを含む共重合体などがあげられ、また、ワックスの
代表例としてはノ(ラフインワックス、木ロウ、蜜ロウ
、マイクロクリスタリンワックス、ポリエチレンワック
ス、セレシンワックス、カルナバワックス、モンタンワ
ックス、酸化ポリエチレンワックス、カスターワックス
The resin and/or wax used here has the property of softening or melting at a temperature of about 0 to 100°C, and representative examples of the resin include terpene resin, polyvinyl chloride,
Polypropylene, I liptylene, polystyrene%ABS
, methacrylic resins, polyvinyl acetate, polycarbonate 1 cellulose, polyester resins, or copolymers containing these monomers. Representative examples of waxes include rough-in wax, wood wax, beeswax, Microcrystalline wax, polyethylene wax, ceresin wax, carnauba wax, montan wax, oxidized polyethylene wax, castor wax.

牛脂、硬化油、ラノリン、ステアリン酸等の各種脂肪酸
、各檻脂肪酸アミド、合aM化ワックス類、合成および
天然エステルワックス類等が挙げられる。
Examples include beef tallow, hydrogenated oil, lanolin, various fatty acids such as stearic acid, various cage fatty acid amides, synthetic aM waxes, synthetic and natural ester waxes, and the like.

染料層(染料と樹脂及び/又はワックスとを主成分とす
る)に占める染料の盆は一鶴にいえないが20〜70重
量弊くらいが適当である。
The amount of dye that occupies the dye layer (mainly consisting of dye, resin, and/or wax) is approximately 20 to 70% by weight, although it cannot be said to be one size.

この層においては樹脂、ワックスはそれぞれ単独で用い
られてもよいが、好ましくは樹脂lOO重量部に対しワ
ックス20〜300重量部の割合で併用される。
In this layer, the resin and the wax may be used alone, but preferably they are used together in a ratio of 20 to 300 parts by weight of wax to 100 parts by weight of the resin.

中間シートは紙、樹脂フィルムなどの表面に有機及び/
又は無機填料と樹脂とを主成分とした多孔質層を設けた
ものである。この多孔質層は樹脂溶液に填料を分散させ
これを紙等のうえに乾燥重量1〜101 / rrlm
Flに塗工することにより作製される。
The intermediate sheet is paper, resin film, etc. with organic and/or
Alternatively, a porous layer mainly composed of an inorganic filler and a resin is provided. This porous layer is made by dispersing filler in a resin solution and placing it on paper etc. with a dry weight of 1 to 101/rrlm.
It is produced by coating Fl.

ここでの有機質又は無機質の填料としては、例えばスデ
レン樹脂粒子、尿素−ホルマリン縮合物樹脂微粒子、水
酸化アルミ=クム、水酸化マグネシウム、炭酸カルシウ
ム、チタン、タルク、カオリン、シリカ、アルミナ等が
ある。
Examples of the organic or inorganic filler include suderene resin particles, urea-formalin condensate resin particles, aluminum cum hydroxide, magnesium hydroxide, calcium carbonate, titanium, talc, kaolin, silica, and alumina.

これら填料は紙、樹脂フィルムなどの上に良好な多孔質
層を形成させることから、その粒径は1〜10μmの範
囲にあるのが望ましい。多孔質層(填料及び樹脂を主成
分とする)に占める填料の量は30〜90重量シくらい
が適当である。なお、この多孔質層の形成に用いられる
樹脂としては、染料層の説明であげた樹脂と同様なもの
が例示できる。
Since these fillers form good porous layers on paper, resin films, etc., their particle size is preferably in the range of 1 to 10 μm. The appropriate amount of filler in the porous layer (mainly composed of filler and resin) is about 30-90% by weight. In addition, as the resin used for forming this porous layer, the same resins as those mentioned in the explanation of the dye layer can be exemplified.

上記の染料層、多孔質層の形成では水や有機溶剤が用い
られるが、有機溶媒の代表例としてはメチルアルコール
、エチルアルコール、酢酸エチ″′1アセトン、メチル
エチルケトン、ジエチルエーテル、テトラヒドロ7ラン
、ヘキサン、ヘプタン、ベンゼン、トルエン、キシレン
、クロロホルム、四塩化炭素などがあげられる。
Water and organic solvents are used to form the above dye layer and porous layer. Typical examples of organic solvents include methyl alcohol, ethyl alcohol, ethyl acetate, acetone, methyl ethyl ketone, diethyl ether, tetrahydro7rane, and hexane. , heptane, benzene, toluene, xylene, chloroform, carbon tetrachloride, etc.

また、これら層の形成においては必要に応じてアジピン
鐵、フタール酸、ステアリン酸、ジヒドロキシステアリ
ン酸、リン酸及びこれら類似物のエステル等の可塑剤が
添加されてもよい。
Furthermore, in forming these layers, plasticizers such as adipine iron, phthalic acid, stearic acid, dihydroxystearic acid, phosphoric acid, and esters of these analogs may be added as necessary.

受容シートは特に制限されないが通常は紙、布などであ
る。
Although the receiving sheet is not particularly limited, it is usually paper, cloth, or the like.

本発明方法の実施では、前記のように、転写シートの染
料層上に正向き画像を先着こあげた水、有機溶媒などで
描くことから始められる。次いで、軟化又は溶解した染
料層形成物質(染料層組成物)が中間シートの多孔質層
上逆向き画像として転写される。転写後、水又は有機溶
媒が揮発除去され、中間シートが紙であっても、染料層
形成物質は多孔質層中に存在するようになり、紙中に浸
み込むことはない。
In carrying out the method of the present invention, as described above, a positive image is drawn on the dye layer of the transfer sheet using first-come-first-served water, an organic solvent, or the like. The softened or dissolved dye layer forming material (dye layer composition) is then transferred as a reverse image onto the porous layer of the intermediate sheet. After the transfer, the water or organic solvent is removed by volatilization, and even if the intermediate sheet is paper, the dye layer-forming substance will be present in the porous layer and will not seep into the paper.

この逆像と受容シートとを重ねて加熱した際には染料の
みが昇華又は気化し、受容シート上に正向きの染料画像
が形成される。加熱手段には赤外線照射によるのが有利
であるが、これに限られるものではない。加熱が行なわ
れた際、加熱温度にもよるが、前記多孔質層中の逆像形
成成分の五つである樹脂及び/又はワックスは溶融する
ことがあっても依然として多孔質層中にとどまり受容シ
ートに付着するようなことはない。また、この加熱時に
多孔質層中の染料が溶融することがあっても、これが中
間シートの紙等に浸み込んだり受容シートに付着してし
まうようなことはない。
When this reverse image and the receiving sheet are superimposed and heated, only the dye sublimes or vaporizes, and a dye image facing forward is formed on the receiving sheet. Advantageously, the heating means uses infrared irradiation, but is not limited thereto. When heating is performed, depending on the heating temperature, the resin and/or wax, which are the five inverse image forming components in the porous layer, may be melted but still remain in the porous layer and not be accepted. It does not stick to the sheet. Further, even if the dye in the porous layer may melt during this heating, it will not penetrate into the paper of the intermediate sheet or adhere to the receiving sheet.

本発明の方法fこよれば、中間シートの多孔質層中に逆
像の染料層形成物質が望ましい状態で収められているの
で、受容シートと重ね加熱する多数回の複写に有利であ
る。
According to the method of the present invention, the dye layer-forming material of the inverse image is contained in the porous layer of the intermediate sheet in a desirable state, so that it is advantageous for multiple copying operations in which the receiving sheet is overlapped with the receiving sheet and heated.

次に実施例及び比較例を示す。ここでの部はすべてX置
部である。
Next, examples and comparative examples will be shown. All parts here are X-position parts.

処施例1 染料(Kayaset Blue 614.日本化薬社
製)  20部カルナウバワックス         
      6部トルエン             
 64部からなる混合物をボールミルで十分分散して調
製した染料層形成液を乾燥憲量約2ay/ぜとなるよう
にポリエステルフィルム上に塗布して転写シートを作成
した。また シリカ244            20部、NIJ
ビニルアルコール(10%水浴液)       10
部水                       
70部よりなる混合物をボールミルで十分分散して調製
した多孔質層形成液を乾燥1量約31 / m”となる
ように上質紙上に塗布して中間シートを作成した。
Treatment Example 1 Dye (Kayaset Blue 614. manufactured by Nippon Kayaku Co., Ltd.) 20 parts Carnauba wax
6 parts toluene
A dye layer forming solution prepared by sufficiently dispersing a mixture of 64 parts in a ball mill was applied onto a polyester film at a dry weight of about 2 ay/day to prepare a transfer sheet. Also, 20 parts of Silica 244, NIJ
Vinyl alcohol (10% water bath solution) 10
Department water
A porous layer-forming liquid prepared by thoroughly dispersing a mixture of 70 parts using a ball mill was applied onto high-quality paper at a dry weight of about 31/m'' to prepare an intermediate sheet.

トルエンを含浸させたフェルトペンを用いて転写シート
上に文字を書いた後、その上に中間シートを重ね手で押
え染料層を転写させ、これを原稿とした。続いて、この
原稿の逆像形成側と受容シート(約5o 11 / r
t?の上質紙)とを重ね合わせて500Wの赤外線ラン
プで10秒間照射したところ、受容シートに鮮明な染料
文字が得られた。
After writing characters on the transfer sheet using a felt-tip pen impregnated with toluene, an intermediate sheet was placed on top of the transfer sheet, and the dye layer was transferred by hand by pressing, and this was used as a manuscript. Subsequently, the reverse image forming side of this original and the receiving sheet (approximately 5o 11/r
T? When the sheets were stacked together and irradiated with a 500 W infrared lamp for 10 seconds, clear dye characters were obtained on the receiving sheet.

また、この原稿をかえることなく10枚の複写を行なっ
ても初期と同様鮮明な画像が得られた。
Further, even when 10 copies were made without changing the original, clear images were obtained as in the initial stage.

実施例2 シリカ244           20部メチルエチ
ルクト7            70部よりなる混合
物をボールミルで十分分散して調製した多孔質層形成液
を乾燥重量的a y / dとなるようにポリイミドフ
ィルム上に塗布して中間シートを作成した。
Example 2 A porous layer forming solution prepared by thoroughly dispersing a mixture consisting of 20 parts of Silica 244 and 70 parts of Methyl Ethylated 7 using a ball mill was coated on a polyimide film to give a dry weight ay/d. I created a sheet.

この中間シートを用いた以外は実施例1とまつたく同様
にして感熱複写操作を行なったところ、実施例1と同じ
ような良好な結果が得られた。
A thermal copying operation was carried out in the same manner as in Example 1 except that this intermediate sheet was used, and the same good results as in Example 1 were obtained.

比較例 中間シートとして上質紙及びポリイミドフィルムを用い
た以外は実施例1とまったく同様にして感熱複写操作を
行なったところ1画像の鮮明さにおいて、上質紙の使用
ではかなり劣り、また、ポリイミドフィルムでは幾分か
劣るのが認められた。
Comparative Example A thermal copying operation was carried out in exactly the same manner as in Example 1, except that high-quality paper and polyimide film were used as the intermediate sheet.The sharpness of one image was considerably inferior when using high-quality paper, and when using polyimide film. It was recognized that it was somewhat inferior.

〔効 果〕〔effect〕

以上のように、中間シートに多孔質層を設けたものが使
用されれば鮮明な画像を多数得ることができる。
As described above, if an intermediate sheet provided with a porous layer is used, many clear images can be obtained.

Claims (1)

【特許請求の範囲】[Claims] 1、昇華法又は気化性染料を含む染料層が設けられた転
写シートに該染料層を軟化ないし溶解しうる溶剤等で画
像を描いた後、これに中間シートを重ね該画像部分を転
写させ逆像とした原図を作成し、次いで、この原図の逆
像形成面と受容シートとを重ね合わせ加熱して該受容シ
ート上に染料画像を得る方法において、該中間シートと
して逆像形成面側に多孔質層を設けたものが用いられる
ことを特徴とする感熱複写方法。
1. After drawing an image using a sublimation method or a solvent that can soften or dissolve the dye layer on a transfer sheet provided with a dye layer containing a vaporizable dye, an intermediate sheet is placed on top of this and the image portion is transferred and reversed. In this method, a dye image is obtained on the receiving sheet by creating an original image as an image, and then heating the reverse image forming side of the original image by superimposing it on the receiving sheet. A thermal copying method characterized in that a material provided with a texture layer is used.
JP60125135A 1985-06-11 1985-06-11 Thermal copy method Pending JPS61284488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60125135A JPS61284488A (en) 1985-06-11 1985-06-11 Thermal copy method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60125135A JPS61284488A (en) 1985-06-11 1985-06-11 Thermal copy method

Publications (1)

Publication Number Publication Date
JPS61284488A true JPS61284488A (en) 1986-12-15

Family

ID=14902723

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60125135A Pending JPS61284488A (en) 1985-06-11 1985-06-11 Thermal copy method

Country Status (1)

Country Link
JP (1) JPS61284488A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428372A (en) * 1991-11-06 1995-06-27 Ricoh Company, Ltd. Multiple-use thermal image transfer recording method
JP2011189608A (en) * 2010-03-15 2011-09-29 Toppan Printing Co Ltd Thermal transfer recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428372A (en) * 1991-11-06 1995-06-27 Ricoh Company, Ltd. Multiple-use thermal image transfer recording method
JP2011189608A (en) * 2010-03-15 2011-09-29 Toppan Printing Co Ltd Thermal transfer recording medium

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