SOLUTION FOR MISSING JETS IN THERMAL INK JET DEVICES
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
The ink housing in the present thermal ink jet (TIJ) print head is molded from Mindel", which is a relatively hydrophobic compound. Consequently, various inks do not completely wet the housing surfaces that they contact. The non-wetting of the housing, by ink, leaves an air interface between the ink and the housing surfaces. Eventually, this air flows into channels located on the die and correspondingly results in missing jets. Hence, a method is proposed for making the housing either selectively or completely hydrophilic. The conversion is achieved by treating the Mindel" housing with any of the known sulfonating agents such as, for example, sulfbr trioxide, oleum, or chlorosulfonic acid, followed by an appropriate treatment to limit the extent of the reaction.