| 摘要 |
Raised Xerographic printing is produced by the use of thermally intumesced electroscopic powders for the development of electrophotographic images. Intumescent electroscopic powders are belended with the powdered pigmented "ink" or "Toner" in the ink reservoir of a Xerographic copying machine. The image is formed and transferred to a paper carrier in the well-known process of Carlson, U.S. Pat. No. 2,297,691. The heat used in thermoadhesively attaching the "Toner" to the paper carrier also causes great intumescence of the intumescent powder, resulting in a raised image. The image is similar in appearance and texture to "engraving" or raised thermographic printing. It can be read by the sightless by tactile recognition. The intumescent powder used is made of vinylidene-chloride-acrylonitrile-isobutane as described by the inventor in his Disclosure Document No. 001078 filed in the U.S. Patent Office on Dec. 22, 1969.
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