Bidirectional hot melt ink jet printing

Details Bidirectional hot melt ink jet printing Bidirectional hot melt ink jet printing

B - Operations, Transporting

41

J

101/96.022

B41J 2/07 (2006.01) B41J 2/15 (2006.01) B41J 2/21 (2006.01)

Patent

CA 2032207

In the representative embodiments of the inven- tion described in the specification, an ink jet head (33) has a series of aligned arrays (35,36,37) of ink jet orifices arranged to project drops of different colored inks in sequence to the same location on a substrate during each scan of the ink jet head adja- cent to the substrate. The spacing of the orifices in each aligned array and the speed of the ink jet head during the scanning are arranged so that all the ink drops applied at the same location on the substrate are applied in a time period of no more than about 100 milliseconds and preferably no more than 50 milli- seconds. Moreover, to avoid banding the lines pro- duced by successive scans of the head are interlaced so as to produce a periodic frequency of no more than about four lines per millimeter.

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