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Dye transfer type thermal printing sheets and method for printing
| Details |
Inventors: Taguchi, Nobuyoshi; Imai, Akihiro; Niwa, Toshio; Murata, Yukichi;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP); Mitsubishi Chemical Industries Limited (Tokyo, JP)
Primary Examiner: Hess; Bruce H.
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher
The dye transfer type thermal printing sheet and method for printing of this invention are a printing sheet comprising a transfer sheet in which a smooth heat-resistant layer composed of fine particles, a liquid lubricating material and a polymer is formed on one side of a substrate, and on the other side is formed a coloring material layer containing at least one sublimable dye, non-sublimable particles and a binder, a part of said non-sublimable particles jutting out from the reference surface of the sublimable dye layer; and an image-receiving sheet having, on a substrate for image-receiving sheet, a development layer composed of, at least, inorganic fine particles; a binder having dye-affinity and another binder immiscible with said binder; and a dye transfer type thermal method for printing which comprises placing the aforesaid coloring material layer and development layer of the above-mentioned printing sheet face to face with each other, heating the printing sheet selectively from the smooth heat-resistant layer side of the transfer sheet, and thereby forming an image on the image-receiving sheet. By the above-mentioned sheet and method, there can given stable running of transfer sheet and a printed image which is reduced in dropout and noise, has a good depth of color and a good quality of image, and is excellent in storage stability. Further, a full-color image also can be obtained by using three kinds of transfer sheets which develop a cyan color, a magenta color or a yellow color, respectively. |
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DETAILED DESCRIPTION This invention relates to a method for printing by thermal dye transfer, particularly a dye transfer type thermal method for printing applied to electronic recording by an electronic device such as a thermal head, a laser beam or the like, and, in particular, aims at providing dye transfer type thermal printing sheets and method for printing which give a good quality of printed image by attaining a sufficient depth of color by use of a dye which is stable and excellent in subliming ability, reducing the dropout and noise in the region of intermediate color tone, and running the printing sheet stably on a thermal head.
The basic structure of the dye transfer type thermal printing sheet of this invention comprises a transfer sheet and an image-receiving sheet.
In the dye transfer sheet, a smooth heat-resistant layer is formed on one side of a substrate and a coloring material layer containing a sublimable dye on the other side.
The image-receiving sheet has a structure in which a development layer is formed on its substrate.
The printing method of this invention comprises placing the coloring material layer and the development layer face to face with each other, heating the resulting assembly selectively from the smooth heat-resistant layer side of the transfer sheet, and thereby forming an image on the image-receiving sheet.
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