Method and apparatus for controlling phase-change ink temperatur

Details Method and apparatus for controlling phase-change ink temperatur Method and apparatus for controlling phase-change ink temperatur

1994-04-04

1996-03-26

Hartary, Joseph W.

Incremental printing of symbolic information

Ink jet

Medium and processing means

347102, B41J 201

Patent

active

055024769

ABSTRACT:
A phase-change ink transfer printing process and apparatus (10) applies a thin layer of a liquid forming an intermediate transfer surface (12) to a heated receiving surface, such as a drum (14). Then an ink-jet printhead (11) deposits a molten ink image (26) onto the heated drum where it cools to the drum temperature and solidifies. After the image is deposited, a print medium (21) is heated by a preheater (27) to a predetermined temperature and fed into a nip (22) formed between the heated drum and an elastomeric transfer roller (23) that is biased toward the drum to form a nip pressure that is about twice the yield strength of the ink image. As the drum turns, the heated print medium is pulled through the nip to transfer and fuse the ink image to the print medium. When in the nip, heat from the drum and print medium combine to heat the ink in accordance with a process window (90), making the ink sufficiently soft and tacky to adhere to the print medium but not to the drum. When the print medium leaves the nip, stripper fingers (24) peel it from the drum and direct it into a media exit path.

REFERENCES:
patent: 4193680 (1980-03-01), Yoshikawa
patent: 4538156 (1985-08-01), Durkee et al.
patent: 4673303 (1987-06-01), Sansone et al.
patent: 4731647 (1988-03-01), Kohsahi
patent: 4833530 (1989-05-01), Kohsahi
patent: 5099256 (1992-03-01), Anderson
patent: 5372852 (1994-12-01), Titterington
patent: 5389958 (1995-02-01), Bui

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