The Sublimable Ink Receptive Coating of sublimation paper (3)
The sublimable inks that are used both in contact printing processes and in contactless printing processes can be oil-based, Water-based, or solvent-based. Oil-based inks are produced With oil, such as mineral oil, vegetable oil or soybean oil, as the main liquid composition in Which the dye particles are dispersed. Water-based inks are inks produced With Water as main liquid component, in Which the dye particles are dispersed in the liquid. Similarly, solvent-based inks are inks produced With organic solvent (e.g., 2-butoxyethyl acetate, cyclohexanone, vinyl chloride, vinyl acetate, decane) as the main liquid component in Which the dye particles are dispersed. In some embodiments, oil may present in solvent based inks. Thickeners may be added to any of the inks to enable processing the ink as a pasty mass, if desired. It may be desired to alter the composition of the ink receptive layer, depending on the composition of the ink being used. For example, papers for use With oil-based inks often have a higher binder level, to inhibit dusting during the printing process.
The side of the paper substrate opposite the sublimable ink receptive coating composition (e.g., the Wire side) can be left uncoated or can have a coating thereon. The side of the paper substrate opposite the sublimable ink receptive coating composition can include a coating such as a conventional sizing composition to provide thesublimation paper With enhanced stability. Sublimation transfer paper that includes a coating on only one side may have an increased tendency to curl. The coating opposite the sublimation ink receptive coating composition can be another sublimation ink receptive coating composition (the same or different than applied on the first side). In addition, the side of the paper substrate opposite the sublimable ink receptive coating com position can include a marker for identifying the paper. The marker may be provided to identify the Weight of the paper or the type of paper useful for certain types of sublimable inks. Furthermore, the marker can indicate the side that is not supposed to receive the sublimable ink for reverse printing. The marker can identify the paper Weight, the paper thickness, or the paper grade. Various markers can include alpha numeric indicia, patterns, and colors. Color can be a preferred marker. People using the paper can identify the color on the side of the dye sublimation paperopposite the sublimable ink receptive coating, and understand that the paper is designed for use With a particular type of sublimable ink. For example, a first paper (e.g., intended for use With Water-based ink) could have a green coating, Whereas a second paper (e. g., intended for use With solvent-based ink) could have a red coating.
The sublimation transfer paper can have a paper substrate and a sublimable ink receptive coating (e.g., on oneside) that provides a desired porosity to achieve a desired, high transfer efficiency. Improving the transfer efficiency can result in improvement (e. g., increase) in color density for the resulting printed product. The higher the color density, the more preferred the product. The transfer paper can have a porosity (measured With a Hagerty Porosity meter) of about 10 to about 1000 sec/100 ml air, and preferably about 50 to about 400 sec/ml air. The transfer paper can have a Hagerty porosity of about 100 to about 250 sec/100 ml air. The Hagerty Porosity meter measures the number of seconds it takes for 100 ml of air to pass through the substrate. The selection of the paper substrate (e.g., ?bers and openness) and the selection of the sublimable ink receptive coating can effect the Hagerty Porosity meter value. For example, increasing the amount of a coating on a paper substrate can cause a decrease in Hagerty Porosity meter value. The sublimation transfer paper according to the invention can be characterized as having a relatively light sublimable ink receptive coating because of the selection of the components of the sublimable ink receptive coating. Other coating, such as, conventional clay coatings can be provided at a heavier Weight or in greater thickness. However, the heavier or thicker clay coatings may result in a sacrifice in porosity and, therefore, a sacrifice in color density. Another advantage of the sublimation transfer paper according to the invention is the ability to provide a relatively thin layer of the sublimable ink receptive coating on the paper substrate to provide a desired porosity and to achieve a desired image as a result of transfer printing.
The Sublimable Ink Receptive Coating of sublimation paper (1)
The Sublimable Ink Receptive Coating of sublimation paper (2)
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